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node_modules/
dist/
release/*.zip
release/*.zip.sha256
coverage/
playwright-report/
test-results/
*.tsbuildinfo
.DS_Store
.npmrc
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@add-ideas:registry=https://git.add-ideas.de/api/packages/lotobo/npm/
CHANGELOG.md
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# Changelog
## 0.1.0 - 2026-09-01
- Added byte-signature inventory, claimed-vs-detected media types, safe names,
SHA-256 hashes, and bounded batches.
- Added project-owned JPEG, PNG, WebP, EXIF/TIFF, IPTC, and XMP scanners with
explicit structural and decompression limits.
- Added ExifReader as a second scanner and best-effort inspect-only coverage for
TIFF, HEIC/HEIF, AVIF, and JPEG XL.
- Added categorized metadata findings, coverage and warning reports, including
selected colour-profile, thumbnail, trailing-data, MPF, JUMBF, and C2PA
indicators.
- Added orientation-normalized pixel re-encoding for supported static JPEG, PNG,
and WebP images, followed by mandatory output hashing, independent re-scan,
dimension/orientation checks, and a bounded pixel-sample comparison.
- Added individual outputs, deterministic JSON reports, bounded batch ZIPs,
cancellation, Toolbox shell integration, offline static packaging, and
explicit no-anonymity boundaries.
- Added generated format/adversarial fixtures, unit gates, and Chromium/Firefox
nested-path and no-network browser gates.
CONTRIBUTING.md
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# Contributing
Run `npm ci`, `npm run check`, and `npm run test:browser` before proposing a change. Keep processing local, preserve explicit limits, and include fixtures for every parser boundary.
LICENSE
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state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.
LICENSES/README.md
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# Licences
The application is GPL-3.0-or-later. Generated release artifacts include an exact runtime dependency licence inventory in `npm-runtime-licenses.txt`.
README.md
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# Privacy Tools
Privacy Tools is a standalone, local-first browser workbench for inspecting
image metadata and producing deliberately re-encoded sharing copies. It is part
of the [add·ideas Toolbox](https://git.add-ideas.de/lotobo/toolbox-portal), but
the static release also runs independently at any nested path.
Selected files stay in the browser. There are no accounts, analytics, remote
lookups, telemetry, or runtime network calls. A source file is never modified.
## Version 0.1 workflow
1. Select or drop a bounded batch. Every file gets a safe display/download name,
SHA-256 hash, byte-signature type detection, and claimed-vs-detected type
result.
2. Review categorized findings, parser coverage, dimensions, animation or
multi-image status, and warnings.
3. For a supported static JPEG, PNG, or WebP, explicitly re-encode the decoded
pixels. EXIF orientation is normalized; source container blocks, embedded
thumbnails, trailing bytes, and source profiles are not copied.
4. An independently parsed output is mandatory. The result states what was
removed, preserved, generated, unsupported, or incompletely checked, and
includes source/output SHA-256 hashes and a bounded decoded-pixel sample
comparison.
5. Download an individual re-encoded image, a JSON report, or a ZIP containing
re-encoded images and the report. The report itself may be sensitive because
it contains source filenames and metadata values.
## Format support
| Format | Inventory | Deep project scan | Secondary scan | Pixel re-encode |
| ------------------------------------------- | --------- | -------------------------------------------------------------------------------------------------------------------------- | --------------------------------- | ------------------------------------------ |
| Static JPEG | Yes | EXIF/TIFF, IPTC/Photoshop, XMP, JFIF, ICC, COM, MPF, selected JUMBF/C2PA and trailing bytes | ExifReader | JPEG |
| Static PNG | Yes | tEXt, zTXt, iTXt/XMP, eXIf/TIFF, iCCP, pHYs, tIME, private/unknown ancillary chunks, selected caBX/C2PA and trailing bytes | ExifReader | PNG |
| Static WebP | Yes | RIFF/VP8 dimensions, EXIF/TIFF, XMP, ICC, META, animation and trailing bytes | ExifReader | WebP where the browser encoder supports it |
| TIFF, HEIC/HEIF, AVIF, JPEG XL | Yes | No | Best-effort ExifReader inspection | No |
| GIF | Yes | No | No supported deep adapter | No |
| PDF, ZIP/Office, OLE/legacy Office, unknown | Yes | No | No | No |
Animation, multi-picture JPEG/MPF, and malformed or partially scanned
JPEG/PNG/WebP inputs are inspect-only. Secondary coverage depends on what
ExifReader can establish for the particular container. A browser may decode a
format it cannot encode; that still does not make it eligible for output.
Findings are grouped as location; people/authorship/rights; dates; device,
serial and lens; software/history; document identifiers; comments/titles/
keywords; embedded previews; colour profiles; provenance; technical; or
unclassified. Raw XMP is shown only as bounded inert text—never injected as
markup.
## Security boundaries and limits
Inputs are untrusted. Container parsing runs in a terminable worker and checks
declared lengths, CRCs, offsets, TIFF cycles/depth/counts, chunk/segment counts,
compressed metadata expansion, dimensions, and aggregate batch size before
continuing. Defaults are 100 files, 128 MiB per file, 512 MiB per batch, 4,096
metadata blocks/findings, 8 MiB per metadata block, 4 MiB decompressed metadata,
512-character labels, 16,384-character values, 256 KiB normalized finding text
per file, 40 megapixels, a 32,768-pixel edge, and a 256 MiB ZIP payload.
The pixel decode/encode step uses browser-native image and Canvas APIs. It runs
only after a complete project scan and bounded dimensions. The output gate does
not trust successful encoding: it hashes and scans the newly encoded bytes
again. C2PA/JUMBF provenance is authenticity information rather than ordinary
tracking metadata; pixel re-encoding removes or invalidates it, and the report
calls that out.
This is not an anonymity tool. Metadata removal does not remove visible faces
or text, steganography, invisible or forensic watermarks, reverse-image
matching, sidecar files, filesystem history, application caches, or cloud and
recipient copies. JPEG and lossy WebP output may alter pixels. Colour profiles,
resolution metadata, and provenance may be lost. Inspect the actual output and
report before sharing it.
See [docs/ARCHITECTURE.md](docs/ARCHITECTURE.md) and
[docs/PRIVACY-SECURITY.md](docs/PRIVACY-SECURITY.md) for the implementation and
threat model.
## Browser and accessibility support
Current evergreen Chromium and Firefox are exercised in the browser gate;
current Safari is an intended target. JavaScript modules, Web Workers, Blob,
Canvas 2D, `createImageBitmap` where available, and Web Crypto are used. WebP
output follows browser encoder support. The application supports the shared
Toolbox system/light/dark themes, keyboard file selection, native table and
disclosure semantics, visible focus, live progress, and non-colour status text.
## Development
Requirements: Node.js 22 or newer and npm 11 or newer.
```sh
npm ci
npm run check
npm run test:browser
npm run dev
```
Vite uses `base: './'`, so `dist/` can be hosted at `/` or below a nested
Toolbox path. `toolbox-check` validates the production manifest and bundle.
## Release
```sh
npm run release:artifact
```
This checks the manifest, types, lint, formatting, unit fixtures, production
build, Toolbox contract, and Chromium/Firefox workflows, then creates the
deterministic `release/privacy-tools-0.1.0.zip` plus its SHA-256 sidecar. The
archive contains the static application, project documents, and exact runtime
dependency licence texts.
## Licence
Privacy Tools is free software under `GPL-3.0-or-later`; see [LICENSE](LICENSE).
Runtime dependencies keep their licences, including ExifReader under MPL-2.0.
See [THIRD_PARTY_NOTICES.md](THIRD_PARTY_NOTICES.md).
SECURITY.md
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# Security
Report vulnerabilities privately to the repository owner. Do not attach a
sensitive source image, generated report, or real metadata to a public issue;
construct a minimal synthetic reproduction instead.
## Input model
Every selected file and every metadata value is untrusted. The application
detects containers from bytes, does not execute imported content, renders text
through React rather than raw HTML, performs no metadata-linked fetches, and
does not preserve source blocks in a re-encoded output. The scanning worker can
be terminated on cancellation. Browser-native pixel decoding remains part of
the browser's trusted computing base.
Default bounds cover file/batch bytes, container blocks, individual metadata,
decompressed PNG metadata, finding lengths/counts, TIFF offsets/entries/depth,
pixel count/edge, and batch ZIP size. Malformed structures become partial or
failed coverage; they must never receive clean-copy eligibility or a verified
output result.
## Output model
A successful Canvas encode is not sufficient. The new bytes are independently
hashed and scanned, expected oriented dimensions are checked, sensitive or
provenance findings fail the verification gate, and incomplete coverage is
reported. C2PA/JUMBF signatures are expected to be removed or invalidated by
pixel re-encoding. Reports and output names are escaped/sanitized and ZIP paths
are application-generated.
No status is an anonymity guarantee. Visible content, steganography, invisible
watermarks, image fingerprinting, sidecars, local filesystem metadata, browser
history, and remote copies are outside the scan.
SOURCE.md
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# Corresponding source
The corresponding source for Privacy Tools 0.1.0 is published at:
https://git.add-ideas.de/lotobo/privacy-tools/src/tag/v0.1.0
Build with Node.js 22 and npm 11:
```sh
npm ci
npm run release:artifact
```
The release command performs all source, test, browser, manifest, and Toolbox
checks before assembling the deterministic static ZIP. The artifact includes
this file, the GPL licence, project documentation, and the runtime dependency
licence texts generated from the exact lockfile.
ExifReader 4.44.0 is unmodified MPL-2.0 covered software within the bundled
application. Its preferred source form is available from the exact npm package
and upstream release identified in `package-lock.json` and
`THIRD_PARTY_NOTICES.md`; its MPL licence text is included in the generated
runtime licence inventory.
THIRD_PARTY_NOTICES.md
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# Third-party notices
Privacy Tools is GPL-3.0-or-later. Dependencies retain their own licences. A
production build generates `LICENSES/npm-runtime-licenses.txt` from the exact
locked runtime packages and copies every available licence/notice text into the
release.
Material runtime components include:
| Component | Version | Licence | Purpose/source |
| -------------------------------- | ------- | ---------------- | -------------------------------------------------------------------------------------------------- |
| ExifReader | 4.44.0 | MPL-2.0 | Secondary metadata parser; <https://github.com/mattiasw/ExifReader/tree/v4.44.0> |
| fflate | 0.8.2 | MIT | Bounded PNG metadata inflation and ZIP creation; <https://github.com/101arrowz/fflate/tree/v0.8.2> |
| `@add-ideas/toolbox-helpers` | 0.1.0 | GPL-3.0-or-later | Hashing, safe names, download and deterministic JSON primitives |
| `@add-ideas/toolbox-contract` | 0.2.3 | Apache-2.0 | Toolbox manifest contract |
| `@add-ideas/toolbox-shell-react` | 0.2.3 | Apache-2.0 | Shared application shell |
| React / React DOM | 19.2.8 | MIT | User interface |
ExifReader is used unmodified. Its MPL-2.0 covered source remains available at
the exact upstream link above and through the npm package resolved by the
lockfile. The bundled executable does not relicense or restrict the MPL-covered
files. Consult the generated licence inventory for the full MPL-2.0 text and
the exact notices shipped with every runtime package.
docs/ACCESSIBILITY.md
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# Accessibility
The workbench uses semantic landmarks, headings, a native multiple-file input,
buttons, tables, definition lists, progress, status/alert regions, and native
disclosures/dialogs. All workflows are keyboard operable; drop is an optional
pointer shortcut. Visible focus and the shared Toolbox system/light/dark themes
are preserved.
Status is always written as text and never encoded by colour alone. Finding
categories expose labels and counts, hashes and media types remain selectable,
and responsive layouts allow horizontal table scrolling without clipping the
whole page. Motion is not required to understand progress or results.
Automated component and Chromium/Firefox browser gates cover semantics and core
workflows. They supplement, rather than replace, manual keyboard, zoom,
screen-reader, high-contrast, and reduced-motion review before release.
docs/ARCHITECTURE.md
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# Architecture
Privacy Tools is a relocatable Vite/React static application. The core domain
model in `src/privacy` is serializable: scan inputs cross a worker boundary as
transferred `ArrayBuffer`s and results contain only strings, numbers, booleans,
arrays, and plain objects. No parser returns HTML or a live third-party object.
## Pipeline
1. `scan-client` checks file count and declared byte totals before reading the
batch, transfers buffers to a dedicated worker, reports progress, and
terminates the worker on cancellation.
2. `detect` compares magic bytes, filename extension, and browser-claimed MIME.
`scanner` hashes bytes, dispatches the bounded project parser, runs
ExifReader as a distinct secondary adapter, and normalizes findings and
coverage.
3. Project parsers walk JPEG segments, PNG chunks, WebP RIFF chunks, TIFF IFDs,
IPTC datasets, and bounded inert XMP text. They validate offsets, lengths,
counts, PNG CRCs, compression expansion, TIFF cycles/depth, and trailing
bytes. They do not follow URLs or instantiate XML/HTML.
4. `sanitize` runs only for complete, static, bounded JPEG/PNG/WebP scans. A
browser decoder produces pixels, the EXIF display orientation is normalized,
and Canvas creates a fresh same-format file. No input container block is
copied.
5. The encoded bytes are passed back through the same independent scanner API,
hashed, dimension-checked, and compared using a deterministic 256-pixel-edge
decoded sample. `buildSanitizationReport` assigns verified/warning/failed
based on explicit coverage and output findings.
6. `archive` serializes bounded deterministic JSON and creates stored ZIP
entries from application-generated `images/` paths and sanitized unique
names.
Pixel decoding and Canvas encoding currently run on the main browser context
because portable cross-browser image encoder support is there; metadata parsing
and hashing run in the terminable worker. UI state does not retain data after a
page refresh and no IndexedDB/localStorage persistence is used by this app.
## Trust boundaries
- Project parsers and ExifReader independently contribute coverage; one parser's
success does not suppress the other's warning.
- Unknown structures are reported or cause partial coverage. Clean-copy
eligibility requires a complete project container scan.
- Browser image decoders, Canvas encoders, Web Crypto, and the JS runtime are in
the trusted computing base.
- ExifReader is pinned to 4.44.0. Dependency updates require malformed-container
regression fixtures and licence review.
- The Toolbox shell receives the application manifest but never receives file
bytes or findings.
docs/PRIVACY-SECURITY.md
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# Privacy and security
## Data handling
Files are read with browser file APIs and transferred to an in-page worker.
There is no upload endpoint, account, telemetry, analytics, remote metadata
lookup, or automatic persistence. Temporary object URLs exist only for the
legacy image-element decode fallback and are revoked immediately after decode.
Download object URLs are created and revoked by the shared helper. Refreshing or
closing the page discards application state.
Service-worker support may fetch and cache the same-origin application shell;
it does not cache imported files, metadata findings, reports, or generated
images. Metadata URLs and XMP/XML markup are inert text and are never fetched or
rendered as HTML.
## What is inspected
Every file receives byte-signature inventory and SHA-256. Static JPEG, PNG, and
WebP receive project-owned deep container parsing plus ExifReader. TIFF,
HEIC/HEIF, AVIF, and JPEG XL receive best-effort ExifReader inspection only.
GIF and document/archive formats receive inventory only. Exact per-format
fields are listed in the README support table.
All parsers are bounded, but a “complete” scan means complete for implemented
structures—not proof that no steganographic or novel carrier exists. Unknown
private chunks and trailing bytes are surfaced. ExifReader failures and format
limitations remain visible in coverage.
## Re-encoded outputs
Only complete, static, dimension-bounded JPEG/PNG/WebP project scans are
eligible. The application decodes pixels, normalizes display orientation, and
uses Canvas to encode a new file of the detected type. It does not selectively
strip GPS while copying everything else, because duplicated values can live in
multiple namespaces and embedded previews. It copies no source metadata block.
The output is always scanned and hashed again. Sensitive or provenance findings,
partial project coverage, or an oriented-dimension mismatch produce a failed
gate. Secondary-parser limitations and provenance invalidation produce explicit
warnings. JPEG and lossy WebP may change pixels; profiles, resolution metadata,
thumbnails, comments, and application history may be lost. PNG is expected to
preserve decoded pixels, subject to browser colour management.
C2PA/JUMBF carries authenticity/provenance claims. Re-encoding normally removes
or invalidates those claims. The tool reports that effect rather than describing
it as an ordinary privacy win.
## What this cannot promise
No result promises anonymity or safe publication. The tool does not remove or
detect visible faces/text/locations, steganography, invisible watermarks,
camera-pattern or image fingerprints, reverse-image matches, sidecar files,
filesystem metadata, clipboard/history records, application caches, backed-up
originals, or cloud/recipient copies. Review the visible output, destination,
report, and surrounding files yourself.
The JSON report is sensitive by design: it can include original filenames,
hashes, timestamps, and metadata values. Share or retain it only intentionally.
eslint.config.mjs
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import js from "@eslint/js";
import globals from "globals";
import reactHooks from "eslint-plugin-react-hooks";
import reactRefresh from "eslint-plugin-react-refresh";
import tseslint from "typescript-eslint";
export default tseslint.config(
{
ignores: [
"dist",
"release",
"coverage",
"test-results",
"playwright-report",
],
},
{
extends: [js.configs.recommended, ...tseslint.configs.recommended],
files: ["**/*.{ts,tsx}"],
languageOptions: {
ecmaVersion: 2023,
globals: { ...globals.browser, ...globals.worker },
},
plugins: { "react-hooks": reactHooks, "react-refresh": reactRefresh },
rules: {
...reactHooks.configs.recommended.rules,
"react-refresh/only-export-components": [
"warn",
{ allowConstantExport: true },
],
},
},
{
files: ["scripts/**/*.mjs", "playwright.config.ts"],
languageOptions: { globals: globals.node },
},
);
index.html
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<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta
name="description"
content="Inspect and remove shareable-file metadata locally in the browser."
/>
<link rel="icon" type="image/svg+xml" href="./favicon.svg" />
<link rel="manifest" href="./manifest.webmanifest" />
<meta name="theme-color" content="#29255f" />
<title>Privacy Tools</title>
</head>
<body>
<div id="root"></div>
<script type="module" src="./src/main.tsx"></script>
</body>
</html>
package-lock.json
Generated
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package.json
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{
"name": "privacy-tools",
"version": "0.1.0",
"description": "Inspect and remove shareable-file metadata locally in the browser.",
"license": "GPL-3.0-or-later",
"author": "Albrecht Degering",
"repository": {
"type": "git",
"url": "git+https://git.add-ideas.de/lotobo/privacy-tools.git"
},
"homepage": "https://git.add-ideas.de/lotobo/privacy-tools",
"bugs": {
"url": "https://git.add-ideas.de/lotobo/privacy-tools/issues"
},
"private": true,
"type": "module",
"engines": {
"node": ">=22"
},
"scripts": {
"predev": "npm run manifest:generate",
"dev": "vite",
"prebuild": "npm run release:prepare && npm run manifest:generate",
"build": "tsc -b && vite build",
"preview": "vite preview",
"typecheck": "tsc -b --pretty false",
"lint": "eslint . --max-warnings=0",
"format": "prettier --write .",
"format:check": "prettier --check .",
"test": "vitest run",
"test:watch": "vitest",
"test:browser": "playwright test",
"manifest:generate": "node scripts/generate-toolbox-manifest.mjs",
"manifest:check": "node scripts/generate-toolbox-manifest.mjs --check",
"release:prepare": "node scripts/prepare-release-files.mjs",
"toolbox:check": "toolbox-check dist",
"package:release": "node scripts/package-release.mjs",
"check": "npm run manifest:check && npm run typecheck && npm run lint && npm run format:check && npm run test && npm run build && npm run toolbox:check",
"release:artifact": "npm run check && npm run test:browser && npm run package:release -- --force"
},
"dependencies": {
"@add-ideas/toolbox-contract": "0.2.3",
"@add-ideas/toolbox-helpers": "0.1.0",
"@add-ideas/toolbox-shell-react": "0.2.3",
"exifreader": "4.44.0",
"fflate": "0.8.2",
"react": "19.2.8",
"react-dom": "19.2.8"
},
"devDependencies": {
"@add-ideas/toolbox-testkit": "0.2.3",
"@eslint/js": "10.0.1",
"@playwright/test": "1.62.1",
"@testing-library/jest-dom": "6.9.1",
"@testing-library/react": "16.3.2",
"@testing-library/user-event": "14.6.1",
"@types/node": "25.9.5",
"@types/react": "19.2.17",
"@types/react-dom": "19.2.5",
"@vitejs/plugin-react": "6.0.3",
"eslint": "10.7.0",
"eslint-plugin-react-hooks": "7.1.1",
"eslint-plugin-react-refresh": "0.5.2",
"globals": "17.7.0",
"jsdom": "29.1.1",
"prettier": "3.9.5",
"typescript": "6.0.3",
"typescript-eslint": "8.64.0",
"vite": "8.2.2",
"vitest": "4.1.11"
},
"packageManager": "npm@11.17.0"
}
playwright.config.ts
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import { defineConfig, devices } from "@playwright/test";
export default defineConfig({
testDir: "./tests/browser",
fullyParallel: false,
workers: 1,
timeout: 120_000,
expect: { timeout: 10_000 },
reporter: [["list"]],
use: { baseURL: "http://127.0.0.1:4173", trace: "retain-on-failure" },
webServer: {
command: "npm run build && node scripts/serve-test.mjs",
url: "http://127.0.0.1:4173",
reuseExistingServer: !process.env.CI,
timeout: 180_000,
},
projects: [
{ name: "chromium", use: { ...devices["Desktop Chrome"] } },
{ name: "firefox", use: { ...devices["Desktop Firefox"] } },
],
});
public/CHANGELOG.md
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# Changelog
## 0.1.0 - 2026-09-01
- Added byte-signature inventory, claimed-vs-detected media types, safe names,
SHA-256 hashes, and bounded batches.
- Added project-owned JPEG, PNG, WebP, EXIF/TIFF, IPTC, and XMP scanners with
explicit structural and decompression limits.
- Added ExifReader as a second scanner and best-effort inspect-only coverage for
TIFF, HEIC/HEIF, AVIF, and JPEG XL.
- Added categorized metadata findings, coverage and warning reports, including
selected colour-profile, thumbnail, trailing-data, MPF, JUMBF, and C2PA
indicators.
- Added orientation-normalized pixel re-encoding for supported static JPEG, PNG,
and WebP images, followed by mandatory output hashing, independent re-scan,
dimension/orientation checks, and a bounded pixel-sample comparison.
- Added individual outputs, deterministic JSON reports, bounded batch ZIPs,
cancellation, Toolbox shell integration, offline static packaging, and
explicit no-anonymity boundaries.
- Added generated format/adversarial fixtures, unit gates, and Chromium/Firefox
nested-path and no-network browser gates.
public/CONTRIBUTING.md
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# Contributing
Run `npm ci`, `npm run check`, and `npm run test:browser` before proposing a change. Keep processing local, preserve explicit limits, and include fixtures for every parser boundary.
public/LICENSE
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GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
Preamble
The GNU General Public License is a free, copyleft license for
software and other kinds of works.
The licenses for most software and other practical works are designed
to take away your freedom to share and change the works. By contrast,
the GNU General Public License is intended to guarantee your freedom to
share and change all versions of a program--to make sure it remains free
software for all its users. We, the Free Software Foundation, use the
GNU General Public License for most of our software; it applies also to
any other work released this way by its authors. You can apply it to
your programs, too.
When we speak of free software, we are referring to freedom, not
price. Our General Public Licenses are designed to make sure that you
have the freedom to distribute copies of free software (and charge for
them if you wish), that you receive source code or can get it if you
want it, that you can change the software or use pieces of it in new
free programs, and that you know you can do these things.
To protect your rights, we need to prevent others from denying you
these rights or asking you to surrender the rights. Therefore, you have
certain responsibilities if you distribute copies of the software, or if
you modify it: responsibilities to respect the freedom of others.
For example, if you distribute copies of such a program, whether
gratis or for a fee, you must pass on to the recipients the same
freedoms that you received. You must make sure that they, too, receive
or can get the source code. And you must show them these terms so they
know their rights.
Developers that use the GNU GPL protect your rights with two steps:
(1) assert copyright on the software, and (2) offer you this License
giving you legal permission to copy, distribute and/or modify it.
For the developers' and authors' protection, the GPL clearly explains
that there is no warranty for this free software. For both users' and
authors' sake, the GPL requires that modified versions be marked as
changed, so that their problems will not be attributed erroneously to
authors of previous versions.
Some devices are designed to deny users access to install or run
modified versions of the software inside them, although the manufacturer
can do so. This is fundamentally incompatible with the aim of
protecting users' freedom to change the software. The systematic
pattern of such abuse occurs in the area of products for individuals to
use, which is precisely where it is most unacceptable. Therefore, we
have designed this version of the GPL to prohibit the practice for those
products. If such problems arise substantially in other domains, we
stand ready to extend this provision to those domains in future versions
of the GPL, as needed to protect the freedom of users.
Finally, every program is threatened constantly by software patents.
States should not allow patents to restrict development and use of
software on general-purpose computers, but in those that do, we wish to
avoid the special danger that patents applied to a free program could
make it effectively proprietary. To prevent this, the GPL assures that
patents cannot be used to render the program non-free.
The precise terms and conditions for copying, distribution and
modification follow.
TERMS AND CONDITIONS
0. Definitions.
"This License" refers to version 3 of the GNU General Public License.
"Copyright" also means copyright-like laws that apply to other kinds of
works, such as semiconductor masks.
"The Program" refers to any copyrightable work licensed under this
License. Each licensee is addressed as "you". "Licensees" and
"recipients" may be individuals or organizations.
To "modify" a work means to copy from or adapt all or part of the work
in a fashion requiring copyright permission, other than the making of an
exact copy. The resulting work is called a "modified version" of the
earlier work or a work "based on" the earlier work.
A "covered work" means either the unmodified Program or a work based
on the Program.
To "propagate" a work means to do anything with it that, without
permission, would make you directly or secondarily liable for
infringement under applicable copyright law, except executing it on a
computer or modifying a private copy. Propagation includes copying,
distribution (with or without modification), making available to the
public, and in some countries other activities as well.
To "convey" a work means any kind of propagation that enables other
parties to make or receive copies. Mere interaction with a user through
a computer network, with no transfer of a copy, is not conveying.
An interactive user interface displays "Appropriate Legal Notices"
to the extent that it includes a convenient and prominently visible
feature that (1) displays an appropriate copyright notice, and (2)
tells the user that there is no warranty for the work (except to the
extent that warranties are provided), that licensees may convey the
work under this License, and how to view a copy of this License. If
the interface presents a list of user commands or options, such as a
menu, a prominent item in the list meets this criterion.
1. Source Code.
The "source code" for a work means the preferred form of the work
for making modifications to it. "Object code" means any non-source
form of a work.
A "Standard Interface" means an interface that either is an official
standard defined by a recognized standards body, or, in the case of
interfaces specified for a particular programming language, one that
is widely used among developers working in that language.
The "System Libraries" of an executable work include anything, other
than the work as a whole, that (a) is included in the normal form of
packaging a Major Component, but which is not part of that Major
Component, and (b) serves only to enable use of the work with that
Major Component, or to implement a Standard Interface for which an
implementation is available to the public in source code form. A
"Major Component", in this context, means a major essential component
(kernel, window system, and so on) of the specific operating system
(if any) on which the executable work runs, or a compiler used to
produce the work, or an object code interpreter used to run it.
The "Corresponding Source" for a work in object code form means all
the source code needed to generate, install, and (for an executable
work) run the object code and to modify the work, including scripts to
control those activities. However, it does not include the work's
System Libraries, or general-purpose tools or generally available free
programs which are used unmodified in performing those activities but
which are not part of the work. For example, Corresponding Source
includes interface definition files associated with source files for
the work, and the source code for shared libraries and dynamically
linked subprograms that the work is specifically designed to require,
such as by intimate data communication or control flow between those
subprograms and other parts of the work.
The Corresponding Source need not include anything that users
can regenerate automatically from other parts of the Corresponding
Source.
The Corresponding Source for a work in source code form is that
same work.
2. Basic Permissions.
All rights granted under this License are granted for the term of
copyright on the Program, and are irrevocable provided the stated
conditions are met. This License explicitly affirms your unlimited
permission to run the unmodified Program. The output from running a
covered work is covered by this License only if the output, given its
content, constitutes a covered work. This License acknowledges your
rights of fair use or other equivalent, as provided by copyright law.
You may make, run and propagate covered works that you do not
convey, without conditions so long as your license otherwise remains
in force. You may convey covered works to others for the sole purpose
of having them make modifications exclusively for you, or provide you
with facilities for running those works, provided that you comply with
the terms of this License in conveying all material for which you do
not control copyright. Those thus making or running the covered works
for you must do so exclusively on your behalf, under your direction
and control, on terms that prohibit them from making any copies of
your copyrighted material outside their relationship with you.
Conveying under any other circumstances is permitted solely under
the conditions stated below. Sublicensing is not allowed; section 10
makes it unnecessary.
3. Protecting Users' Legal Rights From Anti-Circumvention Law.
No covered work shall be deemed part of an effective technological
measure under any applicable law fulfilling obligations under article
11 of the WIPO copyright treaty adopted on 20 December 1996, or
similar laws prohibiting or restricting circumvention of such
measures.
When you convey a covered work, you waive any legal power to forbid
circumvention of technological measures to the extent such circumvention
is effected by exercising rights under this License with respect to
the covered work, and you disclaim any intention to limit operation or
modification of the work as a means of enforcing, against the work's
users, your or third parties' legal rights to forbid circumvention of
technological measures.
4. Conveying Verbatim Copies.
You may convey verbatim copies of the Program's source code as you
receive it, in any medium, provided that you conspicuously and
appropriately publish on each copy an appropriate copyright notice;
keep intact all notices stating that this License and any
non-permissive terms added in accord with section 7 apply to the code;
keep intact all notices of the absence of any warranty; and give all
recipients a copy of this License along with the Program.
You may charge any price or no price for each copy that you convey,
and you may offer support or warranty protection for a fee.
5. Conveying Modified Source Versions.
You may convey a work based on the Program, or the modifications to
produce it from the Program, in the form of source code under the
terms of section 4, provided that you also meet all of these conditions:
a) The work must carry prominent notices stating that you modified
it, and giving a relevant date.
b) The work must carry prominent notices stating that it is
released under this License and any conditions added under section
7. This requirement modifies the requirement in section 4 to
"keep intact all notices".
c) You must license the entire work, as a whole, under this
License to anyone who comes into possession of a copy. This
License will therefore apply, along with any applicable section 7
additional terms, to the whole of the work, and all its parts,
regardless of how they are packaged. This License gives no
permission to license the work in any other way, but it does not
invalidate such permission if you have separately received it.
d) If the work has interactive user interfaces, each must display
Appropriate Legal Notices; however, if the Program has interactive
interfaces that do not display Appropriate Legal Notices, your
work need not make them do so.
A compilation of a covered work with other separate and independent
works, which are not by their nature extensions of the covered work,
and which are not combined with it such as to form a larger program,
in or on a volume of a storage or distribution medium, is called an
"aggregate" if the compilation and its resulting copyright are not
used to limit the access or legal rights of the compilation's users
beyond what the individual works permit. Inclusion of a covered work
in an aggregate does not cause this License to apply to the other
parts of the aggregate.
6. Conveying Non-Source Forms.
You may convey a covered work in object code form under the terms
of sections 4 and 5, provided that you also convey the
machine-readable Corresponding Source under the terms of this License,
in one of these ways:
a) Convey the object code in, or embodied in, a physical product
(including a physical distribution medium), accompanied by the
Corresponding Source fixed on a durable physical medium
customarily used for software interchange.
b) Convey the object code in, or embodied in, a physical product
(including a physical distribution medium), accompanied by a
written offer, valid for at least three years and valid for as
long as you offer spare parts or customer support for that product
model, to give anyone who possesses the object code either (1) a
copy of the Corresponding Source for all the software in the
product that is covered by this License, on a durable physical
medium customarily used for software interchange, for a price no
more than your reasonable cost of physically performing this
conveying of source, or (2) access to copy the
Corresponding Source from a network server at no charge.
c) Convey individual copies of the object code with a copy of the
written offer to provide the Corresponding Source. This
alternative is allowed only occasionally and noncommercially, and
only if you received the object code with such an offer, in accord
with subsection 6b.
d) Convey the object code by offering access from a designated
place (gratis or for a charge), and offer equivalent access to the
Corresponding Source in the same way through the same place at no
further charge. You need not require recipients to copy the
Corresponding Source along with the object code. If the place to
copy the object code is a network server, the Corresponding Source
may be on a different server (operated by you or a third party)
that supports equivalent copying facilities, provided you maintain
clear directions next to the object code saying where to find the
Corresponding Source. Regardless of what server hosts the
Corresponding Source, you remain obligated to ensure that it is
available for as long as needed to satisfy these requirements.
e) Convey the object code using peer-to-peer transmission, provided
you inform other peers where the object code and Corresponding
Source of the work are being offered to the general public at no
charge under subsection 6d.
A separable portion of the object code, whose source code is excluded
from the Corresponding Source as a System Library, need not be
included in conveying the object code work.
A "User Product" is either (1) a "consumer product", which means any
tangible personal property which is normally used for personal, family,
or household purposes, or (2) anything designed or sold for incorporation
into a dwelling. In determining whether a product is a consumer product,
doubtful cases shall be resolved in favor of coverage. For a particular
product received by a particular user, "normally used" refers to a
typical or common use of that class of product, regardless of the status
of the particular user or of the way in which the particular user
actually uses, or expects or is expected to use, the product. A product
is a consumer product regardless of whether the product has substantial
commercial, industrial or non-consumer uses, unless such uses represent
the only significant mode of use of the product.
"Installation Information" for a User Product means any methods,
procedures, authorization keys, or other information required to install
and execute modified versions of a covered work in that User Product from
a modified version of its Corresponding Source. The information must
suffice to ensure that the continued functioning of the modified object
code is in no case prevented or interfered with solely because
modification has been made.
If you convey an object code work under this section in, or with, or
specifically for use in, a User Product, and the conveying occurs as
part of a transaction in which the right of possession and use of the
User Product is transferred to the recipient in perpetuity or for a
fixed term (regardless of how the transaction is characterized), the
Corresponding Source conveyed under this section must be accompanied
by the Installation Information. But this requirement does not apply
if neither you nor any third party retains the ability to install
modified object code on the User Product (for example, the work has
been installed in ROM).
The requirement to provide Installation Information does not include a
requirement to continue to provide support service, warranty, or updates
for a work that has been modified or installed by the recipient, or for
the User Product in which it has been modified or installed. Access to a
network may be denied when the modification itself materially and
adversely affects the operation of the network or violates the rules and
protocols for communication across the network.
Corresponding Source conveyed, and Installation Information provided,
in accord with this section must be in a format that is publicly
documented (and with an implementation available to the public in
source code form), and must require no special password or key for
unpacking, reading or copying.
7. Additional Terms.
"Additional permissions" are terms that supplement the terms of this
License by making exceptions from one or more of its conditions.
Additional permissions that are applicable to the entire Program shall
be treated as though they were included in this License, to the extent
that they are valid under applicable law. If additional permissions
apply only to part of the Program, that part may be used separately
under those permissions, but the entire Program remains governed by
this License without regard to the additional permissions.
When you convey a copy of a covered work, you may at your option
remove any additional permissions from that copy, or from any part of
it. (Additional permissions may be written to require their own
removal in certain cases when you modify the work.) You may place
additional permissions on material, added by you to a covered work,
for which you have or can give appropriate copyright permission.
Notwithstanding any other provision of this License, for material you
add to a covered work, you may (if authorized by the copyright holders of
that material) supplement the terms of this License with terms:
a) Disclaiming warranty or limiting liability differently from the
terms of sections 15 and 16 of this License; or
b) Requiring preservation of specified reasonable legal notices or
author attributions in that material or in the Appropriate Legal
Notices displayed by works containing it; or
c) Prohibiting misrepresentation of the origin of that material, or
requiring that modified versions of such material be marked in
reasonable ways as different from the original version; or
d) Limiting the use for publicity purposes of names of licensors or
authors of the material; or
e) Declining to grant rights under trademark law for use of some
trade names, trademarks, or service marks; or
f) Requiring indemnification of licensors and authors of that
material by anyone who conveys the material (or modified versions of
it) with contractual assumptions of liability to the recipient, for
any liability that these contractual assumptions directly impose on
those licensors and authors.
All other non-permissive additional terms are considered "further
restrictions" within the meaning of section 10. If the Program as you
received it, or any part of it, contains a notice stating that it is
governed by this License along with a term that is a further
restriction, you may remove that term. If a license document contains
a further restriction but permits relicensing or conveying under this
License, you may add to a covered work material governed by the terms
of that license document, provided that the further restriction does
not survive such relicensing or conveying.
If you add terms to a covered work in accord with this section, you
must place, in the relevant source files, a statement of the
additional terms that apply to those files, or a notice indicating
where to find the applicable terms.
Additional terms, permissive or non-permissive, may be stated in the
form of a separately written license, or stated as exceptions;
the above requirements apply either way.
8. Termination.
You may not propagate or modify a covered work except as expressly
provided under this License. Any attempt otherwise to propagate or
modify it is void, and will automatically terminate your rights under
this License (including any patent licenses granted under the third
paragraph of section 11).
However, if you cease all violation of this License, then your
license from a particular copyright holder is reinstated (a)
provisionally, unless and until the copyright holder explicitly and
finally terminates your license, and (b) permanently, if the copyright
holder fails to notify you of the violation by some reasonable means
prior to 60 days after the cessation.
Moreover, your license from a particular copyright holder is
reinstated permanently if the copyright holder notifies you of the
violation by some reasonable means, this is the first time you have
received notice of violation of this License (for any work) from that
copyright holder, and you cure the violation prior to 30 days after
your receipt of the notice.
Termination of your rights under this section does not terminate the
licenses of parties who have received copies or rights from you under
this License. If your rights have been terminated and not permanently
reinstated, you do not qualify to receive new licenses for the same
material under section 10.
9. Acceptance Not Required for Having Copies.
You are not required to accept this License in order to receive or
run a copy of the Program. Ancillary propagation of a covered work
occurring solely as a consequence of using peer-to-peer transmission
to receive a copy likewise does not require acceptance. However,
nothing other than this License grants you permission to propagate or
modify any covered work. These actions infringe copyright if you do
not accept this License. Therefore, by modifying or propagating a
covered work, you indicate your acceptance of this License to do so.
10. Automatic Licensing of Downstream Recipients.
Each time you convey a covered work, the recipient automatically
receives a license from the original licensors, to run, modify and
propagate that work, subject to this License. You are not responsible
for enforcing compliance by third parties with this License.
An "entity transaction" is a transaction transferring control of an
organization, or substantially all assets of one, or subdividing an
organization, or merging organizations. If propagation of a covered
work results from an entity transaction, each party to that
transaction who receives a copy of the work also receives whatever
licenses to the work the party's predecessor in interest had or could
give under the previous paragraph, plus a right to possession of the
Corresponding Source of the work from the predecessor in interest, if
the predecessor has it or can get it with reasonable efforts.
You may not impose any further restrictions on the exercise of the
rights granted or affirmed under this License. For example, you may
not impose a license fee, royalty, or other charge for exercise of
rights granted under this License, and you may not initiate litigation
(including a cross-claim or counterclaim in a lawsuit) alleging that
any patent claim is infringed by making, using, selling, offering for
sale, or importing the Program or any portion of it.
11. Patents.
A "contributor" is a copyright holder who authorizes use under this
License of the Program or a work on which the Program is based. The
work thus licensed is called the contributor's "contributor version".
A contributor's "essential patent claims" are all patent claims
owned or controlled by the contributor, whether already acquired or
hereafter acquired, that would be infringed by some manner, permitted
by this License, of making, using, or selling its contributor version,
but do not include claims that would be infringed only as a
consequence of further modification of the contributor version. For
purposes of this definition, "control" includes the right to grant
patent sublicenses in a manner consistent with the requirements of
this License.
Each contributor grants you a non-exclusive, worldwide, royalty-free
patent license under the contributor's essential patent claims, to
make, use, sell, offer for sale, import and otherwise run, modify and
propagate the contents of its contributor version.
In the following three paragraphs, a "patent license" is any express
agreement or commitment, however denominated, not to enforce a patent
(such as an express permission to practice a patent or covenant not to
sue for patent infringement). To "grant" such a patent license to a
party means to make such an agreement or commitment not to enforce a
patent against the party.
If you convey a covered work, knowingly relying on a patent license,
and the Corresponding Source of the work is not available for anyone
to copy, free of charge and under the terms of this License, through a
publicly available network server or other readily accessible means,
then you must either (1) cause the Corresponding Source to be so
available, or (2) arrange to deprive yourself of the benefit of the
patent license for this particular work, or (3) arrange, in a manner
consistent with the requirements of this License, to extend the patent
license to downstream recipients. "Knowingly relying" means you have
actual knowledge that, but for the patent license, your conveying the
covered work in a country, or your recipient's use of the covered work
in a country, would infringe one or more identifiable patents in that
country that you have reason to believe are valid.
If, pursuant to or in connection with a single transaction or
arrangement, you convey, or propagate by procuring conveyance of, a
covered work, and grant a patent license to some of the parties
receiving the covered work authorizing them to use, propagate, modify
or convey a specific copy of the covered work, then the patent license
you grant is automatically extended to all recipients of the covered
work and works based on it.
A patent license is "discriminatory" if it does not include within
the scope of its coverage, prohibits the exercise of, or is
conditioned on the non-exercise of one or more of the rights that are
specifically granted under this License. You may not convey a covered
work if you are a party to an arrangement with a third party that is
in the business of distributing software, under which you make payment
to the third party based on the extent of your activity of conveying
the work, and under which the third party grants, to any of the
parties who would receive the covered work from you, a discriminatory
patent license (a) in connection with copies of the covered work
conveyed by you (or copies made from those copies), or (b) primarily
for and in connection with specific products or compilations that
contain the covered work, unless you entered into that arrangement,
or that patent license was granted, prior to 28 March 2007.
Nothing in this License shall be construed as excluding or limiting
any implied license or other defenses to infringement that may
otherwise be available to you under applicable patent law.
12. No Surrender of Others' Freedom.
If conditions are imposed on you (whether by court order, agreement or
otherwise) that contradict the conditions of this License, they do not
excuse you from the conditions of this License. If you cannot convey a
covered work so as to satisfy simultaneously your obligations under this
License and any other pertinent obligations, then as a consequence you may
not convey it at all. For example, if you agree to terms that obligate you
to collect a royalty for further conveying from those to whom you convey
the Program, the only way you could satisfy both those terms and this
License would be to refrain entirely from conveying the Program.
13. Use with the GNU Affero General Public License.
Notwithstanding any other provision of this License, you have
permission to link or combine any covered work with a work licensed
under version 3 of the GNU Affero General Public License into a single
combined work, and to convey the resulting work. The terms of this
License will continue to apply to the part which is the covered work,
but the special requirements of the GNU Affero General Public License,
section 13, concerning interaction through a network will apply to the
combination as such.
14. Revised Versions of this License.
The Free Software Foundation may publish revised and/or new versions of
the GNU General Public License from time to time. Such new versions will
be similar in spirit to the present version, but may differ in detail to
address new problems or concerns.
Each version is given a distinguishing version number. If the
Program specifies that a certain numbered version of the GNU General
Public License "or any later version" applies to it, you have the
option of following the terms and conditions either of that numbered
version or of any later version published by the Free Software
Foundation. If the Program does not specify a version number of the
GNU General Public License, you may choose any version ever published
by the Free Software Foundation.
If the Program specifies that a proxy can decide which future
versions of the GNU General Public License can be used, that proxy's
public statement of acceptance of a version permanently authorizes you
to choose that version for the Program.
Later license versions may give you additional or different
permissions. However, no additional obligations are imposed on any
author or copyright holder as a result of your choosing to follow a
later version.
15. Disclaimer of Warranty.
THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
16. Limitation of Liability.
IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
SUCH DAMAGES.
17. Interpretation of Sections 15 and 16.
If the disclaimer of warranty and limitation of liability provided
above cannot be given local legal effect according to their terms,
reviewing courts shall apply local law that most closely approximates
an absolute waiver of all civil liability in connection with the
Program, unless a warranty or assumption of liability accompanies a
copy of the Program in return for a fee.
END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.
public/LICENSES/README.md
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# Licences
The application is GPL-3.0-or-later. Generated release artifacts include an exact runtime dependency licence inventory in `npm-runtime-licenses.txt`.
public/LICENSES/npm-runtime-licenses.txt
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# Privacy Tools
Privacy Tools is a standalone, local-first browser workbench for inspecting
image metadata and producing deliberately re-encoded sharing copies. It is part
of the [add·ideas Toolbox](https://git.add-ideas.de/lotobo/toolbox-portal), but
the static release also runs independently at any nested path.
Selected files stay in the browser. There are no accounts, analytics, remote
lookups, telemetry, or runtime network calls. A source file is never modified.
## Version 0.1 workflow
1. Select or drop a bounded batch. Every file gets a safe display/download name,
SHA-256 hash, byte-signature type detection, and claimed-vs-detected type
result.
2. Review categorized findings, parser coverage, dimensions, animation or
multi-image status, and warnings.
3. For a supported static JPEG, PNG, or WebP, explicitly re-encode the decoded
pixels. EXIF orientation is normalized; source container blocks, embedded
thumbnails, trailing bytes, and source profiles are not copied.
4. An independently parsed output is mandatory. The result states what was
removed, preserved, generated, unsupported, or incompletely checked, and
includes source/output SHA-256 hashes and a bounded decoded-pixel sample
comparison.
5. Download an individual re-encoded image, a JSON report, or a ZIP containing
re-encoded images and the report. The report itself may be sensitive because
it contains source filenames and metadata values.
## Format support
| Format | Inventory | Deep project scan | Secondary scan | Pixel re-encode |
| ------------------------------------------- | --------- | -------------------------------------------------------------------------------------------------------------------------- | --------------------------------- | ------------------------------------------ |
| Static JPEG | Yes | EXIF/TIFF, IPTC/Photoshop, XMP, JFIF, ICC, COM, MPF, selected JUMBF/C2PA and trailing bytes | ExifReader | JPEG |
| Static PNG | Yes | tEXt, zTXt, iTXt/XMP, eXIf/TIFF, iCCP, pHYs, tIME, private/unknown ancillary chunks, selected caBX/C2PA and trailing bytes | ExifReader | PNG |
| Static WebP | Yes | RIFF/VP8 dimensions, EXIF/TIFF, XMP, ICC, META, animation and trailing bytes | ExifReader | WebP where the browser encoder supports it |
| TIFF, HEIC/HEIF, AVIF, JPEG XL | Yes | No | Best-effort ExifReader inspection | No |
| GIF | Yes | No | No supported deep adapter | No |
| PDF, ZIP/Office, OLE/legacy Office, unknown | Yes | No | No | No |
Animation, multi-picture JPEG/MPF, and malformed or partially scanned
JPEG/PNG/WebP inputs are inspect-only. Secondary coverage depends on what
ExifReader can establish for the particular container. A browser may decode a
format it cannot encode; that still does not make it eligible for output.
Findings are grouped as location; people/authorship/rights; dates; device,
serial and lens; software/history; document identifiers; comments/titles/
keywords; embedded previews; colour profiles; provenance; technical; or
unclassified. Raw XMP is shown only as bounded inert text—never injected as
markup.
## Security boundaries and limits
Inputs are untrusted. Container parsing runs in a terminable worker and checks
declared lengths, CRCs, offsets, TIFF cycles/depth/counts, chunk/segment counts,
compressed metadata expansion, dimensions, and aggregate batch size before
continuing. Defaults are 100 files, 128 MiB per file, 512 MiB per batch, 4,096
metadata blocks/findings, 8 MiB per metadata block, 4 MiB decompressed metadata,
512-character labels, 16,384-character values, 256 KiB normalized finding text
per file, 40 megapixels, a 32,768-pixel edge, and a 256 MiB ZIP payload.
The pixel decode/encode step uses browser-native image and Canvas APIs. It runs
only after a complete project scan and bounded dimensions. The output gate does
not trust successful encoding: it hashes and scans the newly encoded bytes
again. C2PA/JUMBF provenance is authenticity information rather than ordinary
tracking metadata; pixel re-encoding removes or invalidates it, and the report
calls that out.
This is not an anonymity tool. Metadata removal does not remove visible faces
or text, steganography, invisible or forensic watermarks, reverse-image
matching, sidecar files, filesystem history, application caches, or cloud and
recipient copies. JPEG and lossy WebP output may alter pixels. Colour profiles,
resolution metadata, and provenance may be lost. Inspect the actual output and
report before sharing it.
See [docs/ARCHITECTURE.md](docs/ARCHITECTURE.md) and
[docs/PRIVACY-SECURITY.md](docs/PRIVACY-SECURITY.md) for the implementation and
threat model.
## Browser and accessibility support
Current evergreen Chromium and Firefox are exercised in the browser gate;
current Safari is an intended target. JavaScript modules, Web Workers, Blob,
Canvas 2D, `createImageBitmap` where available, and Web Crypto are used. WebP
output follows browser encoder support. The application supports the shared
Toolbox system/light/dark themes, keyboard file selection, native table and
disclosure semantics, visible focus, live progress, and non-colour status text.
## Development
Requirements: Node.js 22 or newer and npm 11 or newer.
```sh
npm ci
npm run check
npm run test:browser
npm run dev
```
Vite uses `base: './'`, so `dist/` can be hosted at `/` or below a nested
Toolbox path. `toolbox-check` validates the production manifest and bundle.
## Release
```sh
npm run release:artifact
```
This checks the manifest, types, lint, formatting, unit fixtures, production
build, Toolbox contract, and Chromium/Firefox workflows, then creates the
deterministic `release/privacy-tools-0.1.0.zip` plus its SHA-256 sidecar. The
archive contains the static application, project documents, and exact runtime
dependency licence texts.
## Licence
Privacy Tools is free software under `GPL-3.0-or-later`; see [LICENSE](LICENSE).
Runtime dependencies keep their licences, including ExifReader under MPL-2.0.
See [THIRD_PARTY_NOTICES.md](THIRD_PARTY_NOTICES.md).
public/SECURITY.md
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# Security
Report vulnerabilities privately to the repository owner. Do not attach a
sensitive source image, generated report, or real metadata to a public issue;
construct a minimal synthetic reproduction instead.
## Input model
Every selected file and every metadata value is untrusted. The application
detects containers from bytes, does not execute imported content, renders text
through React rather than raw HTML, performs no metadata-linked fetches, and
does not preserve source blocks in a re-encoded output. The scanning worker can
be terminated on cancellation. Browser-native pixel decoding remains part of
the browser's trusted computing base.
Default bounds cover file/batch bytes, container blocks, individual metadata,
decompressed PNG metadata, finding lengths/counts, TIFF offsets/entries/depth,
pixel count/edge, and batch ZIP size. Malformed structures become partial or
failed coverage; they must never receive clean-copy eligibility or a verified
output result.
## Output model
A successful Canvas encode is not sufficient. The new bytes are independently
hashed and scanned, expected oriented dimensions are checked, sensitive or
provenance findings fail the verification gate, and incomplete coverage is
reported. C2PA/JUMBF signatures are expected to be removed or invalidated by
pixel re-encoding. Reports and output names are escaped/sanitized and ZIP paths
are application-generated.
No status is an anonymity guarantee. Visible content, steganography, invisible
watermarks, image fingerprinting, sidecars, local filesystem metadata, browser
history, and remote copies are outside the scan.
public/SOURCE.md
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# Corresponding source
The corresponding source for Privacy Tools 0.1.0 is published at:
https://git.add-ideas.de/lotobo/privacy-tools/src/tag/v0.1.0
Build with Node.js 22 and npm 11:
```sh
npm ci
npm run release:artifact
```
The release command performs all source, test, browser, manifest, and Toolbox
checks before assembling the deterministic static ZIP. The artifact includes
this file, the GPL licence, project documentation, and the runtime dependency
licence texts generated from the exact lockfile.
ExifReader 4.44.0 is unmodified MPL-2.0 covered software within the bundled
application. Its preferred source form is available from the exact npm package
and upstream release identified in `package-lock.json` and
`THIRD_PARTY_NOTICES.md`; its MPL licence text is included in the generated
runtime licence inventory.
public/THIRD_PARTY_NOTICES.md
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# Third-party notices
Privacy Tools is GPL-3.0-or-later. Dependencies retain their own licences. A
production build generates `LICENSES/npm-runtime-licenses.txt` from the exact
locked runtime packages and copies every available licence/notice text into the
release.
Material runtime components include:
| Component | Version | Licence | Purpose/source |
| -------------------------------- | ------- | ---------------- | -------------------------------------------------------------------------------------------------- |
| ExifReader | 4.44.0 | MPL-2.0 | Secondary metadata parser; <https://github.com/mattiasw/ExifReader/tree/v4.44.0> |
| fflate | 0.8.2 | MIT | Bounded PNG metadata inflation and ZIP creation; <https://github.com/101arrowz/fflate/tree/v0.8.2> |
| `@add-ideas/toolbox-helpers` | 0.1.0 | GPL-3.0-or-later | Hashing, safe names, download and deterministic JSON primitives |
| `@add-ideas/toolbox-contract` | 0.2.3 | Apache-2.0 | Toolbox manifest contract |
| `@add-ideas/toolbox-shell-react` | 0.2.3 | Apache-2.0 | Shared application shell |
| React / React DOM | 19.2.8 | MIT | User interface |
ExifReader is used unmodified. Its MPL-2.0 covered source remains available at
the exact upstream link above and through the npm package resolved by the
lockfile. The bundled executable does not relicense or restrict the MPL-covered
files. Consult the generated licence inventory for the full MPL-2.0 text and
the exact notices shipped with every runtime package.
public/docs/ACCESSIBILITY.md
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# Accessibility
The workbench uses semantic landmarks, headings, a native multiple-file input,
buttons, tables, definition lists, progress, status/alert regions, and native
disclosures/dialogs. All workflows are keyboard operable; drop is an optional
pointer shortcut. Visible focus and the shared Toolbox system/light/dark themes
are preserved.
Status is always written as text and never encoded by colour alone. Finding
categories expose labels and counts, hashes and media types remain selectable,
and responsive layouts allow horizontal table scrolling without clipping the
whole page. Motion is not required to understand progress or results.
Automated component and Chromium/Firefox browser gates cover semantics and core
workflows. They supplement, rather than replace, manual keyboard, zoom,
screen-reader, high-contrast, and reduced-motion review before release.
public/docs/ARCHITECTURE.md
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# Architecture
Privacy Tools is a relocatable Vite/React static application. The core domain
model in `src/privacy` is serializable: scan inputs cross a worker boundary as
transferred `ArrayBuffer`s and results contain only strings, numbers, booleans,
arrays, and plain objects. No parser returns HTML or a live third-party object.
## Pipeline
1. `scan-client` checks file count and declared byte totals before reading the
batch, transfers buffers to a dedicated worker, reports progress, and
terminates the worker on cancellation.
2. `detect` compares magic bytes, filename extension, and browser-claimed MIME.
`scanner` hashes bytes, dispatches the bounded project parser, runs
ExifReader as a distinct secondary adapter, and normalizes findings and
coverage.
3. Project parsers walk JPEG segments, PNG chunks, WebP RIFF chunks, TIFF IFDs,
IPTC datasets, and bounded inert XMP text. They validate offsets, lengths,
counts, PNG CRCs, compression expansion, TIFF cycles/depth, and trailing
bytes. They do not follow URLs or instantiate XML/HTML.
4. `sanitize` runs only for complete, static, bounded JPEG/PNG/WebP scans. A
browser decoder produces pixels, the EXIF display orientation is normalized,
and Canvas creates a fresh same-format file. No input container block is
copied.
5. The encoded bytes are passed back through the same independent scanner API,
hashed, dimension-checked, and compared using a deterministic 256-pixel-edge
decoded sample. `buildSanitizationReport` assigns verified/warning/failed
based on explicit coverage and output findings.
6. `archive` serializes bounded deterministic JSON and creates stored ZIP
entries from application-generated `images/` paths and sanitized unique
names.
Pixel decoding and Canvas encoding currently run on the main browser context
because portable cross-browser image encoder support is there; metadata parsing
and hashing run in the terminable worker. UI state does not retain data after a
page refresh and no IndexedDB/localStorage persistence is used by this app.
## Trust boundaries
- Project parsers and ExifReader independently contribute coverage; one parser's
success does not suppress the other's warning.
- Unknown structures are reported or cause partial coverage. Clean-copy
eligibility requires a complete project container scan.
- Browser image decoders, Canvas encoders, Web Crypto, and the JS runtime are in
the trusted computing base.
- ExifReader is pinned to 4.44.0. Dependency updates require malformed-container
regression fixtures and licence review.
- The Toolbox shell receives the application manifest but never receives file
bytes or findings.
public/docs/PRIVACY-SECURITY.md
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# Privacy and security
## Data handling
Files are read with browser file APIs and transferred to an in-page worker.
There is no upload endpoint, account, telemetry, analytics, remote metadata
lookup, or automatic persistence. Temporary object URLs exist only for the
legacy image-element decode fallback and are revoked immediately after decode.
Download object URLs are created and revoked by the shared helper. Refreshing or
closing the page discards application state.
Service-worker support may fetch and cache the same-origin application shell;
it does not cache imported files, metadata findings, reports, or generated
images. Metadata URLs and XMP/XML markup are inert text and are never fetched or
rendered as HTML.
## What is inspected
Every file receives byte-signature inventory and SHA-256. Static JPEG, PNG, and
WebP receive project-owned deep container parsing plus ExifReader. TIFF,
HEIC/HEIF, AVIF, and JPEG XL receive best-effort ExifReader inspection only.
GIF and document/archive formats receive inventory only. Exact per-format
fields are listed in the README support table.
All parsers are bounded, but a “complete” scan means complete for implemented
structures—not proof that no steganographic or novel carrier exists. Unknown
private chunks and trailing bytes are surfaced. ExifReader failures and format
limitations remain visible in coverage.
## Re-encoded outputs
Only complete, static, dimension-bounded JPEG/PNG/WebP project scans are
eligible. The application decodes pixels, normalizes display orientation, and
uses Canvas to encode a new file of the detected type. It does not selectively
strip GPS while copying everything else, because duplicated values can live in
multiple namespaces and embedded previews. It copies no source metadata block.
The output is always scanned and hashed again. Sensitive or provenance findings,
partial project coverage, or an oriented-dimension mismatch produce a failed
gate. Secondary-parser limitations and provenance invalidation produce explicit
warnings. JPEG and lossy WebP may change pixels; profiles, resolution metadata,
thumbnails, comments, and application history may be lost. PNG is expected to
preserve decoded pixels, subject to browser colour management.
C2PA/JUMBF carries authenticity/provenance claims. Re-encoding normally removes
or invalidates those claims. The tool reports that effect rather than describing
it as an ordinary privacy win.
## What this cannot promise
No result promises anonymity or safe publication. The tool does not remove or
detect visible faces/text/locations, steganography, invisible watermarks,
camera-pattern or image fingerprints, reverse-image matches, sidecar files,
filesystem metadata, clipboard/history records, application caches, backed-up
originals, or cloud/recipient copies. Review the visible output, destination,
report, and surrounding files yourself.
The JSON report is sensitive by design: it can include original filenames,
hashes, timestamps, and metadata values. Share or retain it only intentionally.
public/favicon.svg
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64" role="img" aria-label="Privacy Tools"><path fill="#5b4ec4" d="M11 4h30l12 12v44H11z"/><path fill="#fff" opacity=".28" d="M41 4v14h12"/><text x="32" y="43" fill="#fff" font-family="system-ui,sans-serif" font-size="18" font-weight="800" text-anchor="middle">PR</text></svg>
Side by Side

After

Width:  |  Height:  |  Size: 332 B

public/manifest.webmanifest
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{
"name": "Privacy Tools",
"short_name": "Privacy",
"description": "Inspect and remove shareable-file metadata locally in the browser.",
"start_url": "./",
"scope": "./",
"display": "standalone",
"background_color": "#f6f7fb",
"theme_color": "#29255f",
"icons": [
{
"src": "./favicon.svg",
"sizes": "any",
"type": "image/svg+xml",
"purpose": "any maskable"
}
]
}
public/sw.js
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const CACHE_PREFIX = "privacy-tools-shell-";
const CACHE_NAME = CACHE_PREFIX + "0.1.0";
const CORE = ["./", "./manifest.webmanifest", "./favicon.svg"];
self.addEventListener("install", (event) => {
event.waitUntil(
caches.open(CACHE_NAME).then(async (cache) => {
await cache.addAll(CORE);
const html = await (await fetch("./")).text();
const assets = [...html.matchAll(/(?:src|href)="(\.\/assets\/[^"]+)"/g)]
.map((match) => match[1])
.filter(Boolean);
await cache.addAll(assets);
}),
);
self.skipWaiting();
});
self.addEventListener("activate", (event) => {
event.waitUntil(
caches
.keys()
.then((keys) =>
Promise.all(
keys
.filter((key) => key.startsWith(CACHE_PREFIX) && key !== CACHE_NAME)
.map((key) => caches.delete(key)),
),
)
.then(() => self.clients.claim()),
);
});
self.addEventListener("fetch", (event) => {
if (event.request.method !== "GET") return;
const url = new URL(event.request.url);
if (
url.origin !== self.location.origin ||
!url.pathname.startsWith(new URL(self.registration.scope).pathname)
)
return;
event.respondWith(
caches.match(event.request).then(
(cached) =>
cached ??
fetch(event.request).then((response) => {
if (response.ok) {
const copy = response.clone();
void caches
.open(CACHE_NAME)
.then((cache) => cache.put(event.request, copy));
}
return response;
}),
),
);
});
public/toolbox-app.json
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{
"$schema": "https://git.add-ideas.de/lotobo/toolbox-sdk/raw/branch/main/schemas/toolbox-app.v1.schema.json",
"schemaVersion": 1,
"id": "de.add-ideas.privacy-tools",
"name": "Privacy Tools",
"version": "0.1.0",
"description": "Inspect and remove shareable-file metadata locally in the browser.",
"entry": "./",
"icon": "./favicon.svg",
"categories": ["privacy", "files", "security"],
"tags": ["metadata", "exif", "privacy", "sanitize", "share"],
"integration": {
"contextVersion": 1,
"launchModes": ["navigate", "new-tab"],
"embedding": "unsupported"
},
"requirements": {
"secureContext": true,
"workers": true,
"indexedDb": false,
"crossOriginIsolated": false,
"topLevelContext": false
},
"privacy": {
"processing": "local",
"fileUploads": true,
"telemetry": false,
"label": "Inputs stay in this browser; nothing is uploaded."
},
"source": {
"repository": "https://git.add-ideas.de/lotobo/privacy-tools",
"license": "GPL-3.0-or-later"
},
"actions": [
{
"id": "source",
"label": "Source",
"url": "https://git.add-ideas.de/lotobo/privacy-tools"
}
]
}
scripts/generate-toolbox-manifest.mjs
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import { readFile, writeFile } from "node:fs/promises";
import path from "node:path";
import { fileURLToPath } from "node:url";
import { format } from "prettier";
const root = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "..");
const sourcePath = path.join(root, "src/toolbox/manifest.source.json");
const outputPath = path.join(root, "public/toolbox-app.json");
const source = JSON.parse(await readFile(sourcePath, "utf8"));
const pkg = JSON.parse(await readFile(path.join(root, "package.json"), "utf8"));
const versionSource = await readFile(path.join(root, "src/version.ts"), "utf8");
const appVersion = /^export const APP_VERSION = "([^"]+)";$/mu.exec(
versionSource,
)?.[1];
const repository = "https://git.add-ideas.de/lotobo/" + pkg.name;
if (source.version !== pkg.version || appVersion !== pkg.version)
throw new Error("Version identity drift");
if (
source.id !== "de.add-ideas." + pkg.name ||
source.source?.repository !== repository ||
source.source?.license !== "GPL-3.0-or-later"
)
throw new Error("Manifest source identity is invalid");
const serialized = await format(JSON.stringify(source), {
filepath: outputPath,
});
if (process.argv.includes("--check")) {
if ((await readFile(outputPath, "utf8").catch(() => "")) !== serialized)
throw new Error("public/toolbox-app.json is stale");
console.log("Toolbox manifest is synchronized");
} else {
await writeFile(outputPath, serialized);
console.log("Generated public/toolbox-app.json");
}
scripts/package-release.mjs
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#!/usr/bin/env node
import { createHash } from "node:crypto";
import { execFile } from "node:child_process";
import {
access,
chmod,
copyFile,
cp,
lstat,
mkdir,
mkdtemp,
readFile,
readdir,
rename,
rm,
utimes,
writeFile,
} from "node:fs/promises";
import os from "node:os";
import path from "node:path";
import { promisify } from "node:util";
import { fileURLToPath } from "node:url";
const execute = promisify(execFile);
const root = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "..");
const pkg = JSON.parse(await readFile(path.join(root, "package.json"), "utf8"));
const argument = (name, fallback) => {
const index = process.argv.indexOf(name);
return index >= 0 ? process.argv[index + 1] : fallback;
};
const output = path.resolve(
root,
argument("--output", "release/" + pkg.name + "-" + pkg.version + ".zip"),
);
const checksumOutput = output + ".sha256";
const force = process.argv.includes("--force");
if (
path.extname(output).toLowerCase() !== ".zip" ||
output === root ||
output === path.parse(output).root
)
throw new Error("Unsafe release target");
const exists = (file) =>
access(file).then(
() => true,
() => false,
);
if (!force && ((await exists(output)) || (await exists(checksumOutput))))
throw new Error("Release output exists");
const input = path.join(root, "dist");
for (const name of [
"index.html",
"manifest.webmanifest",
"sw.js",
"toolbox-app.json",
"favicon.svg",
"README.md",
"CHANGELOG.md",
"CONTRIBUTING.md",
"LICENSE",
"SECURITY.md",
"SOURCE.md",
"THIRD_PARTY_NOTICES.md",
"LICENSES/README.md",
"LICENSES/npm-runtime-licenses.txt",
"docs/ACCESSIBILITY.md",
"docs/ARCHITECTURE.md",
"docs/PRIVACY-SECURITY.md",
]) {
const details = await lstat(path.join(input, name)).catch(() => null);
if (!details?.isFile() || details.isSymbolicLink())
throw new Error("Missing release file: " + name);
}
const manifest = JSON.parse(
await readFile(path.join(input, "toolbox-app.json"), "utf8"),
);
const repository = "https://git.add-ideas.de/lotobo/" + pkg.name;
if (
manifest.id !== "de.add-ideas." + pkg.name ||
manifest.version !== pkg.version ||
manifest.entry !== "./" ||
manifest.icon !== "./favicon.svg" ||
manifest.source?.repository !== repository
)
throw new Error("Packaged manifest identity is invalid");
if (
/\b(?:src|href)=["']\//iu.test(
await readFile(path.join(input, "index.html"), "utf8"),
)
)
throw new Error("Root-absolute asset reference");
async function collect(directory, prefix = "") {
const files = [];
for (const entry of (await readdir(directory, { withFileTypes: true })).sort(
(a, b) => a.name.localeCompare(b.name),
)) {
const absolute = path.join(directory, entry.name);
const relative = prefix ? prefix + "/" + entry.name : entry.name;
if (entry.isSymbolicLink())
throw new Error("Symlink in release: " + relative);
if (entry.isDirectory()) files.push(...(await collect(absolute, relative)));
else if (entry.isFile()) files.push({ absolute, relative });
else throw new Error("Unsupported release entry: " + relative);
}
return files;
}
const sourceFiles = await collect(input);
for (const file of sourceFiles)
if (
file.relative.endsWith(".map") ||
/(?:^|\/)(?:\.env(?:\.|$)|id_rsa|id_ed25519|.*\.pem$|.*\.key$)/iu.test(
file.relative,
) ||
file.relative.split("/").includes("..")
)
throw new Error("Forbidden release entry: " + file.relative);
await mkdir(path.dirname(output), { recursive: true });
const stagingRoot = await mkdtemp(
path.join(os.tmpdir(), pkg.name + "-release-"),
);
const publicationRoot = await mkdtemp(
path.join(path.dirname(output), "." + pkg.name + "-publish-"),
);
const stagedTree = path.join(stagingRoot, "tree");
const stagedArchive = path.join(stagingRoot, path.basename(output));
try {
await cp(input, stagedTree, { recursive: true });
const timestamp = new Date("1980-01-01T00:00:00.000Z");
for (const file of await collect(stagedTree)) {
await chmod(file.absolute, 0o644);
await utimes(file.absolute, timestamp, timestamp);
}
await execute(
"zip",
[
"-X",
"-q",
"-9",
stagedArchive,
...sourceFiles.map((file) => file.relative),
],
{
cwd: stagedTree,
env: { ...process.env, TZ: "UTC" },
maxBuffer: 1024 * 1024,
},
);
const archive = await readFile(stagedArchive);
const digest = createHash("sha256").update(archive).digest("hex");
const stagedChecksum = stagedArchive + ".sha256";
await writeFile(stagedChecksum, digest + " " + path.basename(output) + "\n");
const publicationArchive = path.join(publicationRoot, path.basename(output));
const publicationChecksum = publicationArchive + ".sha256";
await copyFile(stagedArchive, publicationArchive);
await copyFile(stagedChecksum, publicationChecksum);
if (force) {
await rm(output, { force: true });
await rm(checksumOutput, { force: true });
}
await rename(publicationArchive, output);
await rename(publicationChecksum, checksumOutput);
console.log("Created " + path.relative(root, output) + "\nSHA-256 " + digest);
} finally {
await rm(stagingRoot, { recursive: true, force: true });
await rm(publicationRoot, { recursive: true, force: true });
}
scripts/prepare-release-files.mjs
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import { cp, mkdir, readFile, readdir, rm, writeFile } from "node:fs/promises";
import path from "node:path";
import { fileURLToPath } from "node:url";
const root = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "..");
const destination = path.join(root, "public");
for (const name of [
"LICENSE",
"README.md",
"CHANGELOG.md",
"CONTRIBUTING.md",
"SECURITY.md",
"SOURCE.md",
"THIRD_PARTY_NOTICES.md",
]) {
await readFile(path.join(root, name));
await cp(path.join(root, name), path.join(destination, name));
}
for (const directory of ["LICENSES", "docs"]) {
const output = path.join(destination, directory);
await rm(output, { recursive: true, force: true });
await cp(path.join(root, directory), output, { recursive: true });
}
const lock = JSON.parse(
await readFile(path.join(root, "package-lock.json"), "utf8"),
);
const sections = [];
for (const [location, locked] of Object.entries(lock.packages ?? {}).sort(
([a], [b]) => a.localeCompare(b),
)) {
if (!location.includes("node_modules/") || locked.dev === true) continue;
const packageDirectory = path.join(root, location);
const details = JSON.parse(
await readFile(path.join(packageDirectory, "package.json"), "utf8"),
);
const candidates = (await readdir(packageDirectory))
.filter((name) => /^(?:licen[cs]e|copying|notice)(?:\.|$)/iu.test(name))
.sort();
const texts = [];
for (const candidate of candidates) {
try {
texts.push(
"--- " +
candidate +
" ---\n" +
(await readFile(path.join(packageDirectory, candidate), "utf8")),
);
} catch {
/* directory */
}
}
sections.push(
"=".repeat(78) +
"\n" +
details.name +
"@" +
details.version +
"\nDeclared licence: " +
(details.license ?? locked.license ?? "See upstream") +
"\n" +
"=".repeat(78) +
"\n" +
(texts.join("\n\n") || "See upstream package metadata."),
);
}
await mkdir(path.join(destination, "LICENSES"), { recursive: true });
await writeFile(
path.join(destination, "LICENSES/npm-runtime-licenses.txt"),
sections.join("\n\n").trimEnd() + "\n",
);
console.log("Prepared release documentation");
scripts/serve-test.mjs
+66
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import { createServer } from "node:http";
import { readFile, stat } from "node:fs/promises";
import path from "node:path";
import { fileURLToPath } from "node:url";
const root = path.resolve(
path.dirname(fileURLToPath(import.meta.url)),
"..",
"dist",
);
const prefix = "/deep/nested/privacy/";
const types = new Map([
[".css", "text/css; charset=utf-8"],
[".html", "text/html; charset=utf-8"],
[".js", "text/javascript; charset=utf-8"],
[".json", "application/json; charset=utf-8"],
[".webmanifest", "application/manifest+json; charset=utf-8"],
[".svg", "image/svg+xml"],
[".md", "text/markdown; charset=utf-8"],
[".txt", "text/plain; charset=utf-8"],
[".wasm", "application/wasm"],
[".png", "image/png"],
[".jpg", "image/jpeg"],
[".webp", "image/webp"],
]);
const headers = {
"Content-Security-Policy":
"default-src 'self'; base-uri 'self'; object-src 'none'; frame-ancestors 'none'; form-action 'self'; script-src 'self' 'wasm-unsafe-eval'; style-src 'self' 'unsafe-inline'; img-src 'self' data: blob:; media-src 'self' blob:; connect-src 'self'; worker-src 'self' blob:; manifest-src 'self'",
"Cross-Origin-Opener-Policy": "same-origin",
"Cross-Origin-Resource-Policy": "same-origin",
"Permissions-Policy":
"camera=(), microphone=(), geolocation=(), usb=(), payment=()",
"Referrer-Policy": "no-referrer",
"X-Content-Type-Options": "nosniff",
};
const server = createServer(async (request, response) => {
try {
const url = new URL(request.url ?? "/", "http://127.0.0.1");
const relative = decodeURIComponent(url.pathname).startsWith(prefix)
? decodeURIComponent(url.pathname).slice(prefix.length)
: decodeURIComponent(url.pathname).replace(/^\/+/, "");
const normalized = path.posix.normalize(relative || "index.html");
if (
normalized === ".." ||
normalized.startsWith("../") ||
path.isAbsolute(normalized)
) {
response.writeHead(400).end("Bad request");
return;
}
let file = path.join(root, normalized);
if ((await stat(file).catch(() => null))?.isDirectory())
file = path.join(file, "index.html");
const content = await readFile(file);
response.writeHead(200, {
"Content-Type":
types.get(path.extname(file)) ?? "application/octet-stream",
"Cache-Control": "no-cache",
...headers,
});
response.end(content);
} catch {
response.writeHead(404, { "Content-Type": "text/plain; charset=utf-8" });
response.end("Not found");
}
});
server.listen(4173, "127.0.0.1", () => console.log("Test server ready"));
src/App.tsx
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import { lazy, Suspense, useState } from "react";
import { AppShell } from "@add-ideas/toolbox-shell-react";
import "@add-ideas/toolbox-shell-react/styles.css";
import "./styles.css";
import { ErrorBoundary } from "./components/ErrorBoundary";
import { HelpDialog } from "./components/HelpDialog";
import { manifest } from "./toolbox/manifest";
const Workbench = lazy(async () => ({
default: (await import("./components/Workbench")).Workbench,
}));
export function App() {
const [helpOpen, setHelpOpen] = useState(false);
return (
<ErrorBoundary>
<AppShell
app={manifest}
manifestUrl="./toolbox-app.json"
helpAction={{ onClick: () => setHelpOpen(true) }}
>
<Suspense
fallback={
<p className="loading" role="status">
Preparing Privacy Tools…
</p>
}
>
<Workbench />
</Suspense>
</AppShell>
<HelpDialog open={helpOpen} onClose={() => setHelpOpen(false)} />
</ErrorBoundary>
);
}
src/components/ErrorBoundary.tsx
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import { Component, type ErrorInfo, type ReactNode } from "react";
export class ErrorBoundary extends Component<
{ children: ReactNode },
{ error?: Error }
> {
state: { error?: Error } = {};
static getDerivedStateFromError(error: Error) {
return { error };
}
componentDidCatch(error: Error, info: ErrorInfo) {
console.error("Application failure", error, info);
}
render() {
if (this.state.error)
return (
<main className="fatal">
<h1>Privacy Tools could not continue</h1>
<p>{this.state.error.message}</p>
<button type="button" onClick={() => location.reload()}>
Reload
</button>
</main>
);
return this.props.children;
}
}
src/components/HelpDialog.tsx
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import { useEffect, useRef } from "react";
export function HelpDialog({
open,
onClose,
}: {
open: boolean;
onClose(): void;
}) {
const dialog = useRef<HTMLDialogElement>(null);
useEffect(() => {
const node = dialog.current;
if (!node) return;
if (open && !node.open) node.showModal();
if (!open && node.open) node.close();
}, [open]);
return (
<dialog
ref={dialog}
className="help-dialog"
onClose={onClose}
onCancel={(event) => {
event.preventDefault();
onClose();
}}
aria-labelledby="help-title"
>
<div className="dialog-heading">
<div>
<p className="eyebrow">Local-first help</p>
<h2 id="help-title">About Privacy Tools</h2>
</div>
<button type="button" onClick={onClose} aria-label="Close help">
×
</button>
</div>
<div className="help-sections">
<section>
<h3>What inspection covers</h3>
<p>
All files receive magic-byte inventory. JPEG, PNG and WebP receive
bounded container scans for EXIF, IPTC, XMP, text, profiles,
thumbnails and selected provenance blocks. A separate ExifReader
pass expands coverage and inspects TIFF, HEIC, AVIF and JXL on a
best-effort basis. GIF and document formats receive inventory only.
</p>
</section>
<section>
<h3>What a clean copy means</h3>
<p>
Supported static images are decoded to pixels, displayed orientation
is normalized, and a new JPEG, PNG or WebP is encoded. No source
metadata block is copied. The output must pass both scanners before
it can receive a verified result.
</p>
</section>
<section>
<h3>Important limits</h3>
<p>
Animation and multi-image files are inspect-only. Re-encoding may
change JPEG/WebP pixels, colour profiles, resolution metadata and
file size. C2PA/JUMBF provenance is removed or invalidated and is
never silently described as preserved.
</p>
</section>
<section>
<h3>No anonymity promise</h3>
<p>
Visible content, steganography, invisible watermarks, reverse-image
matching, sidecars, filesystem history and remote copies remain
outside this tool. Review the actual image before sharing it.
</p>
</section>
</div>
</dialog>
);
}
src/components/Workbench.tsx
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import { useEffect, useMemo, useRef, useState } from "react";
import { triggerBlobDownload } from "@add-ideas/toolbox-helpers";
import {
createBatchArchive,
createBatchReport,
sanitizeStaticImage,
scanFilesInWorker,
serializeReport,
type FindingCategory,
type ImageScanResult,
type SanitizedAsset,
} from "../privacy";
interface FileRecord {
file: File;
scan: ImageScanResult;
asset?: SanitizedAsset;
sanitizing?: boolean;
error?: string;
}
interface Progress {
completed: number;
total: number;
currentName: string;
}
const CATEGORY_LABELS: Readonly<Record<FindingCategory, string>> =
Object.freeze({
location: "Location",
identity: "People, authorship & rights",
timestamp: "Dates & times",
device: "Device, serial & lens",
software: "Software & history",
"document-id": "Document identifiers",
comment: "Comments, titles & keywords",
thumbnail: "Embedded previews & extra images",
"colour-profile": "Colour profiles",
provenance: "Provenance & signatures",
technical: "Technical metadata",
unknown: "Unclassified metadata",
});
export function Workbench() {
const [records, setRecords] = useState<FileRecord[]>([]);
const [busy, setBusy] = useState<"scan" | "sanitize" | "archive" | null>(
null,
);
const [progress, setProgress] = useState<Progress | null>(null);
const [error, setError] = useState("");
const [dragging, setDragging] = useState(false);
const abortRef = useRef<AbortController | null>(null);
const inputRef = useRef<HTMLInputElement>(null);
const cleanable = useMemo(
() => records.filter((record) => record.scan.cleanable),
[records],
);
const assets = useMemo(
() => records.flatMap((record) => (record.asset ? [record.asset] : [])),
[records],
);
useEffect(
() => () => {
abortRef.current?.abort();
},
[],
);
const importFiles = async (selection: FileList | readonly File[]) => {
const files = Array.from(selection);
if (files.length === 0) return;
abortRef.current?.abort();
const controller = new AbortController();
abortRef.current = controller;
setBusy("scan");
setProgress({
completed: 0,
total: files.length,
currentName: files[0]?.name ?? "",
});
setError("");
setRecords([]);
try {
const scans = await scanFilesInWorker(
files,
setProgress,
controller.signal,
);
if (controller.signal.aborted) return;
setRecords(scans.map((scan, index) => ({ file: files[index]!, scan })));
} catch (caught) {
if (!isAbort(caught)) setError(errorMessage(caught));
} finally {
if (abortRef.current === controller) {
abortRef.current = null;
setBusy(null);
setProgress(null);
}
if (inputRef.current) inputRef.current.value = "";
}
};
const sanitizeOne = async (id: string) => {
const record = records.find((item) => item.scan.id === id);
if (!record?.scan.cleanable) return;
const controller = new AbortController();
abortRef.current = controller;
setBusy("sanitize");
setError("");
setRecords((current) =>
current.map((item) =>
item.scan.id === id
? { ...item, sanitizing: true, error: undefined }
: item,
),
);
try {
const asset = await sanitizeStaticImage(record.file, record.scan, {
signal: controller.signal,
});
setRecords((current) =>
current.map((item) =>
item.scan.id === id
? { ...item, asset, sanitizing: false, error: undefined }
: item,
),
);
} catch (caught) {
if (!isAbort(caught))
setRecords((current) =>
current.map((item) =>
item.scan.id === id
? {
...item,
sanitizing: false,
error: errorMessage(caught),
}
: item,
),
);
} finally {
if (abortRef.current === controller) abortRef.current = null;
setBusy(null);
}
};
const sanitizeAll = async () => {
const pending = records.filter(
(record) => record.scan.cleanable && !record.asset,
);
if (pending.length === 0) return;
const controller = new AbortController();
abortRef.current = controller;
setBusy("sanitize");
setError("");
for (let index = 0; index < pending.length; index += 1) {
const record = pending[index];
if (!record || controller.signal.aborted) break;
setProgress({
completed: index,
total: pending.length,
currentName: record.file.name,
});
setRecords((current) =>
current.map((item) =>
item.scan.id === record.scan.id
? { ...item, sanitizing: true, error: undefined }
: item,
),
);
try {
const asset = await sanitizeStaticImage(record.file, record.scan, {
signal: controller.signal,
});
setRecords((current) =>
current.map((item) =>
item.scan.id === record.scan.id
? { ...item, asset, sanitizing: false }
: item,
),
);
} catch (caught) {
if (isAbort(caught)) break;
setRecords((current) =>
current.map((item) =>
item.scan.id === record.scan.id
? {
...item,
sanitizing: false,
error: errorMessage(caught),
}
: item,
),
);
}
}
if (abortRef.current === controller) abortRef.current = null;
setRecords((current) =>
current.map((record) =>
record.sanitizing ? { ...record, sanitizing: false } : record,
),
);
setProgress(null);
setBusy(null);
};
const downloadReport = () => {
setError("");
try {
const report = createBatchReport(
records.map((record) => record.scan),
assets,
);
triggerBlobDownload(
new Blob([serializeReport(report)], { type: "application/json" }),
"privacy-tools-report.json",
);
} catch (caught) {
setError(errorMessage(caught));
}
};
const downloadArchive = async () => {
if (assets.length === 0) return;
setBusy("archive");
setError("");
try {
const blob = await createBatchArchive(
records.map((record) => record.scan),
assets,
);
triggerBlobDownload(blob, "privacy-tools-re-encoded-images.zip");
} catch (caught) {
setError(errorMessage(caught));
} finally {
setBusy(null);
}
};
const clear = () => {
abortRef.current?.abort();
abortRef.current = null;
setRecords([]);
setBusy(null);
setProgress(null);
setError("");
};
return (
<div className="workbench">
<header className="hero">
<div>
<p className="eyebrow">Image metadata workbench</p>
<h1>Privacy Tools</h1>
<p>
Inventory files, inspect static-image metadata, then create and
independently re-scan pixel-only sharing copies—all in this browser.
</p>
</div>
<span className="privacy-pill">Local &amp; ephemeral</span>
</header>
<section className="panel import-panel" aria-labelledby="import-heading">
<div className="panel-heading">
<div>
<p className="eyebrow">Step 1</p>
<h2 id="import-heading">Choose files to inspect</h2>
</div>
<span className="limit-note">
100 files · 128 MiB each · 512 MiB batch
</span>
</div>
<button
type="button"
className={`drop-zone${dragging ? " is-dragging" : ""}`}
disabled={busy !== null}
onClick={() => inputRef.current?.click()}
onDragEnter={(event) => {
event.preventDefault();
setDragging(true);
}}
onDragOver={(event) => event.preventDefault()}
onDragLeave={(event) => {
if (
!event.currentTarget.contains(event.relatedTarget as Node | null)
)
setDragging(false);
}}
onDrop={(event) => {
event.preventDefault();
setDragging(false);
void importFiles(event.dataTransfer.files);
}}
>
<span className="drop-icon" aria-hidden="true">
⇧
</span>
<strong>Drop files here or choose files</strong>
<span>
Every file gets claimed-vs-detected type inventory. JPEG, PNG and
static WebP receive the deep clean-copy workflow.
</span>
</button>
<input
ref={inputRef}
className="sr-only"
type="file"
multiple
aria-label="Choose files to inspect"
onChange={(event) => {
if (event.currentTarget.files)
void importFiles(event.currentTarget.files);
}}
/>
{busy && progress ? (
<div className="progress" role="status">
<progress value={progress.completed} max={progress.total} />
<span>
{busy === "scan" ? "Inspecting" : "Re-encoding"}{" "}
{progress.currentName} · {progress.completed} of {progress.total}
</span>
</div>
) : null}
{error ? (
<p className="error-message" role="alert">
{error}
</p>
) : null}
</section>
{records.length > 0 ? (
<>
<section className="panel" aria-labelledby="inventory-heading">
<div className="panel-heading action-heading">
<div>
<p className="eyebrow">Step 2</p>
<h2 id="inventory-heading">Batch inventory</h2>
<p className="muted">
Detection uses file bytes, not just the extension or browser
claim.
</p>
</div>
<div className="button-row">
<button
type="button"
className="primary-button"
disabled={
busy !== null || cleanable.every((record) => record.asset)
}
onClick={() => void sanitizeAll()}
>
Re-encode {cleanable.filter((record) => !record.asset).length}{" "}
supported
</button>
{busy === "scan" || busy === "sanitize" ? (
<button
type="button"
onClick={() => abortRef.current?.abort()}
>
Cancel
</button>
) : null}
<button type="button" disabled={busy !== null} onClick={clear}>
Clear batch
</button>
</div>
</div>
<div className="inventory-table-wrap">
<table className="inventory-table">
<thead>
<tr>
<th>File</th>
<th>Claimed</th>
<th>Detected</th>
<th>Findings</th>
<th>Clean copy</th>
</tr>
</thead>
<tbody>
{records.map((record) => (
<tr key={record.scan.id}>
<td>
<strong>{record.scan.name}</strong>
<span>
{formatBytes(record.scan.size)} ·{" "}
{record.scan.sha256.slice(0, 12)}…
</span>
</td>
<td>
<code>
{record.scan.identity.claimedType || "not claimed"}
</code>
<span>.{record.scan.identity.extension || "none"}</span>
</td>
<td>
<code>{record.scan.identity.detectedType}</code>
<StatusBadge status={record.scan.identity.typeMatch} />
</td>
<td>
<strong>{record.scan.findings.length}</strong>
<span>
{record.scan.coverage.projectScanner} project scan
</span>
</td>
<td>
{record.asset ? (
<StatusBadge status={record.asset.report.status} />
) : record.scan.cleanable ? (
<button
type="button"
disabled={busy !== null}
onClick={() => void sanitizeOne(record.scan.id)}
>
{record.sanitizing ? "Working…" : "Re-encode"}
</button>
) : (
<span className="muted">Inspect only</span>
)}
</td>
</tr>
))}
</tbody>
</table>
</div>
</section>
<section className="file-results" aria-label="Detailed file findings">
{records.map((record) => (
<FileResult
key={record.scan.id}
record={record}
busy={busy !== null}
onSanitize={() => void sanitizeOne(record.scan.id)}
/>
))}
</section>
<section
className="panel export-panel"
aria-labelledby="export-heading"
>
<div className="panel-heading action-heading">
<div>
<p className="eyebrow">Step 3</p>
<h2 id="export-heading">Export deliberately</h2>
<p className="muted">
The JSON report includes original filenames and detected
values and may itself be sensitive.
</p>
</div>
<div className="button-row">
<button
type="button"
onClick={downloadReport}
disabled={busy !== null}
>
Download JSON report
</button>
<button
type="button"
className="primary-button"
onClick={() => void downloadArchive()}
disabled={busy !== null || assets.length === 0}
>
Download {assets.length} re-encoded{" "}
{assets.length === 1 ? "image" : "images"} + report
</button>
</div>
</div>
</section>
</>
) : null}
<aside className="boundary-note">
<strong>No anonymity promise.</strong> Metadata removal cannot remove
visible faces or text, steganography, invisible watermarks,
reverse-image matches, sidecar files, filesystem records, or copies
stored elsewhere.
</aside>
</div>
);
}
function FileResult({
record,
busy,
onSanitize,
}: {
record: FileRecord;
busy: boolean;
onSanitize(): void;
}) {
const grouped = groupFindings(record.scan);
return (
<article className="panel file-card">
<header className="file-card-heading">
<div>
<p className="eyebrow">
{record.scan.identity.detectedKind.toUpperCase()}
</p>
<h2>{record.scan.name}</h2>
<p className="muted hash-line">
{record.scan.width && record.scan.height
? `${record.scan.width} × ${record.scan.height} pixels · `
: ""}
SHA-256 <code>{record.scan.sha256}</code>
</p>
</div>
<div className="button-row">
{record.scan.cleanable && !record.asset ? (
<button
type="button"
className="primary-button"
disabled={busy}
onClick={onSanitize}
>
Re-encode &amp; verify
</button>
) : null}
{record.asset ? (
<button
type="button"
className="primary-button"
onClick={() =>
triggerBlobDownload(
record.asset!.blob,
record.asset!.report.outputName,
)
}
>
Download re-encoded output
</button>
) : null}
</div>
</header>
{record.error ? (
<p className="error-message" role="alert">
{record.error}
</p>
) : null}
{record.scan.warnings.length > 0 ? (
<ul className="warning-list">
{record.scan.warnings.map((warning) => (
<li key={warning}>{warning}</li>
))}
</ul>
) : null}
<div className="finding-summary">
{grouped.length === 0 ? (
<p>
No recognized metadata findings were reported within scanner
coverage.
</p>
) : (
grouped.map(([category, findings]) => (
<details
key={category}
open={findings.some((finding) => finding.risk === "sensitive")}
>
<summary>
<span>{CATEGORY_LABELS[category]}</span>
<span>{findings.length}</span>
</summary>
<div className="finding-list">
{findings.slice(0, 50).map((finding) => (
<div key={finding.id}>
<div>
<strong>{finding.label}</strong>
<span>{finding.source}</span>
</div>
<code>{finding.value || "(empty)"}</code>
</div>
))}
{findings.length > 50 ? (
<p className="omitted-findings">
{findings.length - 50} more findings are included in the
JSON report.
</p>
) : null}
</div>
</details>
))
)}
</div>
{record.asset ? <Verification report={record.asset.report} /> : null}
</article>
);
}
function Verification({ report }: { report: SanitizedAsset["report"] }) {
return (
<section
className={`verification is-${report.status}`}
aria-label="Output verification"
>
<div className="verification-heading">
<div>
<p className="eyebrow">Mandatory output re-scan</p>
<h3>{report.summary}</h3>
</div>
<StatusBadge status={report.status} />
</div>
<dl className="verification-grid">
<div>
<dt>Output hash</dt>
<dd>
<code>{report.outputSha256}</code>
</dd>
</div>
<div>
<dt>Metadata</dt>
<dd>
{report.removed.length} removed · {report.preserved.length}{" "}
preserved · {report.generated.length} generated
</dd>
</div>
<div>
<dt>Orientation</dt>
<dd>
{report.orientationNormalized ? "Normalized" : "Review required"}
</dd>
</div>
<div>
<dt>Pixel sample</dt>
<dd>
{report.pixelComparison.identical
? "Identical"
: "Changed after encoding"}
</dd>
</div>
</dl>
{report.generated.length > 0 ? (
<details>
<summary>Generated or preserved output metadata</summary>
<ul>
{report.generated.map((finding) => (
<li key={finding.id}>
{finding.label}: {finding.value}
</li>
))}
</ul>
</details>
) : null}
{[...report.unsupported, ...report.incomplete].length > 0 ? (
<ul className="warning-list">
{[...report.unsupported, ...report.incomplete].map((note) => (
<li key={note}>{note}</li>
))}
</ul>
) : null}
<p className="disclaimer">{report.disclaimer}</p>
</section>
);
}
function StatusBadge({ status }: { status: string }) {
const normalized = status.replace(/[^a-z]+/gu, "-");
return <span className={`status-badge is-${normalized}`}>{status}</span>;
}
function groupFindings(
scan: ImageScanResult,
): Array<[FindingCategory, ImageScanResult["findings"]]> {
const groups = new Map<FindingCategory, ImageScanResult["findings"]>();
for (const finding of scan.findings) {
const values = groups.get(finding.category) ?? [];
values.push(finding);
groups.set(finding.category, values);
}
return [...groups.entries()];
}
function formatBytes(value: number): string {
if (value < 1024) return `${value} B`;
if (value < 1024 ** 2) return `${(value / 1024).toFixed(1)} KiB`;
return `${(value / 1024 ** 2).toFixed(1)} MiB`;
}
function errorMessage(error: unknown): string {
return error instanceof Error ? error.message : "The operation failed.";
}
function isAbort(error: unknown): boolean {
return error instanceof DOMException && error.name === "AbortError";
}
src/main.tsx
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import { StrictMode } from "react";
import { createRoot } from "react-dom/client";
import { App } from "./App";
createRoot(document.getElementById("root")!).render(
<StrictMode>
<App />
</StrictMode>,
);
if ("serviceWorker" in navigator && import.meta.env.PROD) {
window.addEventListener("load", () => {
const url = new URL("./sw.js", document.baseURI);
void navigator.serviceWorker
.register(url, { scope: new URL("./", document.baseURI).pathname })
.catch(() => undefined);
});
}
src/privacy/archive.ts
+121
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import {
encodeText,
sanitizeDownloadFilename,
stableStringify,
} from "@add-ideas/toolbox-helpers";
import { zipSync } from "fflate";
import { APP_VERSION } from "../version";
import {
assertLimit,
DEFAULT_PRIVACY_LIMITS,
PrivacyLimitError,
} from "./limits";
import type {
BatchReport,
ImageScanResult,
SanitizedAsset,
SanitizationReport,
} from "./model";
export function createBatchReport(
files: readonly ImageScanResult[],
assets: readonly SanitizedAsset[],
generatedAt = new Date().toISOString(),
): BatchReport {
return {
schemaVersion: 1,
generatedAt,
application: { name: "Privacy Tools", version: APP_VERSION },
files: [...files],
sanitizations: assets.map((asset) => asset.report),
warnings: [
"This report may itself contain sensitive source metadata and filenames; store and share it deliberately.",
"A successful re-scan is not an anonymity guarantee; see each sanitization disclaimer.",
],
};
}
export function serializeReport(
report: BatchReport | SanitizationReport,
): string {
return stableStringify(report, 2, {
maxDepth: 64,
maxNodes: 500_000,
maxTextChars: 2_000_000,
});
}
export async function createBatchArchive(
files: readonly ImageScanResult[],
assets: readonly SanitizedAsset[],
generatedAt = new Date().toISOString(),
): Promise<Blob> {
assertLimit(
files.length,
DEFAULT_PRIVACY_LIMITS.maxFiles,
"Report file count",
);
assertLimit(
assets.length,
DEFAULT_PRIVACY_LIMITS.maxFiles,
"Archive image count",
);
const entries: Record<string, Uint8Array> = Object.create(null) as Record<
string,
Uint8Array
>;
const names = new Set<string>();
let total = 0;
for (const asset of assets) {
const name = uniqueName(asset.report.outputName, names);
const bytes = new Uint8Array(await asset.blob.arrayBuffer());
total += bytes.byteLength;
if (total > DEFAULT_PRIVACY_LIMITS.maxZipBytes)
throw new PrivacyLimitError(
"Batch archive input size",
total,
DEFAULT_PRIVACY_LIMITS.maxZipBytes,
);
entries[`images/${name}`] = bytes;
}
const report = encodeText(
serializeReport(createBatchReport(files, assets, generatedAt)),
);
total += report.byteLength;
if (total > DEFAULT_PRIVACY_LIMITS.maxZipBytes)
throw new PrivacyLimitError(
"Batch archive input size",
total,
DEFAULT_PRIVACY_LIMITS.maxZipBytes,
);
entries["privacy-tools-report.json"] = report;
const archive = zipSync(entries, {
level: 0,
mtime: new Date("1980-01-01T00:00:00.000Z"),
});
if (archive.byteLength > DEFAULT_PRIVACY_LIMITS.maxZipBytes)
throw new PrivacyLimitError(
"Batch archive output size",
archive.byteLength,
DEFAULT_PRIVACY_LIMITS.maxZipBytes,
);
const ownedArchive = archive.slice().buffer as ArrayBuffer;
return new Blob([ownedArchive], { type: "application/zip" });
}
function uniqueName(input: string, used: Set<string>): string {
const safe = sanitizeDownloadFilename(input, "image.clean");
if (!used.has(safe)) {
used.add(safe);
return safe;
}
const dot = safe.lastIndexOf(".");
const stem = dot > 0 ? safe.slice(0, dot) : safe;
const extension = dot > 0 ? safe.slice(dot) : "";
let counter = 2;
while (used.has(`${stem}-${counter}${extension}`)) counter += 1;
const candidate = `${stem}-${counter}${extension}`;
used.add(candidate);
return candidate;
}
src/privacy/detect.ts
+149
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import type { DetectedKind, InventoryIdentity } from "./model";
const MIME_BY_KIND: Readonly<Record<DetectedKind, string>> = Object.freeze({
jpeg: "image/jpeg",
png: "image/png",
webp: "image/webp",
gif: "image/gif",
tiff: "image/tiff",
heic: "image/heic",
avif: "image/avif",
jxl: "image/jxl",
pdf: "application/pdf",
zip: "application/zip",
ole: "application/x-ole-storage",
unknown: "application/octet-stream",
});
const EXTENSIONS: Readonly<Record<string, DetectedKind>> = Object.freeze({
jpg: "jpeg",
jpeg: "jpeg",
jpe: "jpeg",
png: "png",
webp: "webp",
gif: "gif",
tif: "tiff",
tiff: "tiff",
heic: "heic",
heif: "heic",
avif: "avif",
jxl: "jxl",
pdf: "pdf",
zip: "zip",
docx: "zip",
xlsx: "zip",
pptx: "zip",
odt: "zip",
ods: "zip",
odp: "zip",
doc: "ole",
xls: "ole",
ppt: "ole",
});
export function fileExtension(name: string): string {
const leaf = name.replace(/\\/gu, "/").split("/").at(-1) ?? "";
const index = leaf.lastIndexOf(".");
return index > 0 && index < leaf.length - 1
? leaf.slice(index + 1).toLowerCase()
: "";
}
export function detectKind(bytes: Uint8Array): DetectedKind {
if (starts(bytes, [0xff, 0xd8, 0xff])) return "jpeg";
if (starts(bytes, [0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a]))
return "png";
if (ascii(bytes, 0, 4) === "RIFF" && ascii(bytes, 8, 4) === "WEBP")
return "webp";
if (ascii(bytes, 0, 6) === "GIF87a" || ascii(bytes, 0, 6) === "GIF89a")
return "gif";
if (
starts(bytes, [0x49, 0x49, 0x2a, 0x00]) ||
starts(bytes, [0x4d, 0x4d, 0x00, 0x2a])
)
return "tiff";
if (starts(bytes, [0x25, 0x50, 0x44, 0x46, 0x2d])) return "pdf";
if (
starts(bytes, [0x50, 0x4b, 0x03, 0x04]) ||
starts(bytes, [0x50, 0x4b, 0x05, 0x06]) ||
starts(bytes, [0x50, 0x4b, 0x07, 0x08])
)
return "zip";
if (starts(bytes, [0xd0, 0xcf, 0x11, 0xe0, 0xa1, 0xb1, 0x1a, 0xe1]))
return "ole";
if (starts(bytes, [0xff, 0x0a])) return "jxl";
if (
starts(
bytes,
[0x00, 0x00, 0x00, 0x0c, 0x4a, 0x58, 0x4c, 0x20, 0x0d, 0x0a, 0x87, 0x0a],
)
)
return "jxl";
const brand = isoBmffBrand(bytes);
if (["avif", "avis"].includes(brand)) return "avif";
if (["heic", "heix", "hevc", "hevx", "mif1", "msf1"].includes(brand))
return "heic";
return "unknown";
}
export function inventoryIdentity(
name: string,
claimedType: string,
bytes: Uint8Array,
): InventoryIdentity {
const extension = fileExtension(name);
const detectedKind = detectKind(bytes);
const detectedType = MIME_BY_KIND[detectedKind];
const normalizedClaim = claimedType.trim().toLowerCase();
const extensionKind = EXTENSIONS[extension];
const claimedMatches =
!normalizedClaim || normalizedClaim === "application/octet-stream"
? undefined
: normalizeMime(normalizedClaim) === detectedType;
const extensionMatches = !extensionKind || extensionKind === detectedKind;
const typeMatch =
detectedKind === "unknown"
? "unknown"
: claimedMatches === false || !extensionMatches
? "mismatch"
: claimedMatches === undefined && !extensionKind
? "unclaimed"
: "match";
return {
claimedType: normalizedClaim,
extension,
detectedKind,
detectedType,
typeMatch,
};
}
function normalizeMime(value: string): string {
if (value === "image/jpg" || value === "image/pjpeg") return "image/jpeg";
if (value === "image/x-png") return "image/png";
if (value === "image/heif") return "image/heic";
return value;
}
function starts(bytes: Uint8Array, signature: readonly number[]): boolean {
return signature.every((value, index) => bytes[index] === value);
}
function ascii(bytes: Uint8Array, offset: number, length: number): string {
if (offset < 0 || length < 0 || offset + length > bytes.byteLength) return "";
let result = "";
for (let index = 0; index < length; index += 1)
result += String.fromCharCode(bytes[offset + index] ?? 0);
return result;
}
function isoBmffBrand(bytes: Uint8Array): string {
if (bytes.byteLength < 12 || ascii(bytes, 4, 4) !== "ftyp") return "";
const length =
((bytes[0] ?? 0) << 24) |
((bytes[1] ?? 0) << 16) |
((bytes[2] ?? 0) << 8) |
(bytes[3] ?? 0);
if (length < 12 || length > bytes.byteLength) return "";
return ascii(bytes, 8, 4).toLowerCase();
}
src/privacy/exif-reader-adapter.ts
+141
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import ExifReader, { type ExpandedTags } from "exifreader";
import { categoryForName, FindingCollector } from "./findings";
import type { PrivacyLimits } from "./model";
import { scanXmp } from "./xmp";
export interface SecondaryScan {
status: "complete" | "partial" | "unsupported" | "failed";
width?: number;
height?: number;
notes: string[];
}
const GROUP_LABELS: Readonly<Record<string, string>> = Object.freeze({
exif: "ExifReader EXIF",
iptc: "ExifReader IPTC",
icc: "ExifReader ICC",
jfif: "ExifReader JFIF",
png: "ExifReader PNG",
pngText: "ExifReader PNG text",
riff: "ExifReader WebP",
gps: "ExifReader GPS",
photoshop: "ExifReader Photoshop",
makerNotes: "ExifReader maker notes",
composite: "ExifReader computed",
});
export function scanWithExifReader(
bytes: ArrayBuffer,
collector: FindingCollector,
limits: Readonly<PrivacyLimits>,
): SecondaryScan {
try {
const tags = ExifReader.load(bytes, {
expanded: true,
async: false,
computed: true,
includeUnknown: false,
excludeTags: { xmp: true, mpf: true },
decompress: { maxDecompressedSize: limits.maxInflatedMetadataBytes },
});
const fileType = tags.file?.FileType?.value;
if (!fileType)
return {
status: "unsupported",
notes: ["ExifReader did not recognize this format."],
};
const width = numericTag(tags.file?.["Image Width"]);
const height = numericTag(tags.file?.["Image Height"]);
let nodes = 0;
for (const [groupName, source] of Object.entries(GROUP_LABELS)) {
const group = tags[groupName as keyof ExpandedTags] as unknown;
if (!group || typeof group !== "object") continue;
for (const [name, tag] of Object.entries(group)) {
nodes += 1;
if (nodes > limits.maxFindings) {
collector.warn(
"ExifReader finding count reached the application limit.",
);
return {
status: "partial",
width,
height,
notes: ["ExifReader output was truncated at the finding limit."],
};
}
if (name.startsWith("_") || name === "base64" || name === "image")
continue;
const value = tagValue(tag);
if (!value) continue;
const classification =
groupName === "gps"
? ({ category: "location", risk: "sensitive" } as const)
: categoryForName(`${groupName} ${name}`);
collector.add({
...classification,
source,
label: name,
value,
});
}
}
if (tags.Thumbnail) {
const image = tags.Thumbnail.image;
const length =
image instanceof ArrayBuffer || image instanceof SharedArrayBuffer
? image.byteLength
: image?.byteLength;
collector.add({
category: "thumbnail",
risk: "sensitive",
source: "ExifReader thumbnail",
label: "Embedded thumbnail",
value: `${length ?? "unknown"} bytes`,
});
}
const rawXmp = tags.xmp?._raw;
if (typeof rawXmp === "string")
scanXmp(rawXmp, "ExifReader XMP", undefined, collector);
if (width === undefined || height === undefined)
return {
status: "partial",
width,
height,
notes: [
"ExifReader recognized the container but could not establish both pixel dimensions.",
],
};
return { status: "complete", width, height, notes: [] };
} catch (error) {
return {
status: "failed",
notes: [
`ExifReader could not complete: ${error instanceof Error ? error.message : "unknown error"}`,
],
};
}
}
function numericTag(tag: unknown): number | undefined {
if (!tag || typeof tag !== "object") return undefined;
const value = (tag as { value?: unknown }).value;
return typeof value === "number" && Number.isFinite(value)
? value
: undefined;
}
function tagValue(tag: unknown): string {
if (tag == null) return "";
if (typeof tag === "string" || typeof tag === "number") return String(tag);
if (Array.isArray(tag)) return tag.slice(0, 128).map(tagValue).join(", ");
if (ArrayBuffer.isView(tag)) return `${tag.byteLength} bytes`;
if (tag instanceof ArrayBuffer || tag instanceof SharedArrayBuffer)
return `${tag.byteLength} bytes`;
if (typeof tag === "object") {
const item = tag as { description?: unknown; value?: unknown };
if (typeof item.description === "string") return item.description;
if (item.value !== undefined) return tagValue(item.value);
}
return "";
}
src/privacy/findings.ts
+159
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import type {
FindingCategory,
FindingRisk,
MetadataFinding,
PrivacyLimits,
} from "./model";
export class FindingCollector {
readonly findings: MetadataFinding[] = [];
readonly warnings: string[] = [];
limited = false;
readonly #keys = new Set<string>();
readonly #limits: Readonly<PrivacyLimits>;
#textChars = 0;
constructor(limits: Readonly<PrivacyLimits>) {
this.#limits = limits;
}
add(
finding: Omit<MetadataFinding, "id" | "value"> & {
id?: string;
value: unknown;
},
): void {
if (this.limited) return;
const source = boundedLabel(
finding.source,
this.#limits.maxFindingLabelChars,
);
const label = boundedLabel(
finding.label,
this.#limits.maxFindingLabelChars,
);
let value = displayValue(finding.value);
if (value.length > this.#limits.maxFindingValueChars) {
value = `${value.slice(0, this.#limits.maxFindingValueChars)}…`;
this.warn(
`${source} ${label} was truncated to ${this.#limits.maxFindingValueChars} characters.`,
);
}
const key = `${source}\u0000${label}\u0000${value}\u0000${finding.offset ?? ""}`;
if (this.#keys.has(key)) return;
const addedText = source.length + label.length + value.length;
if (
this.findings.length >= this.#limits.maxFindings ||
this.#textChars + addedText > this.#limits.maxFindingTextChars
) {
this.limited = true;
this.warn(
`Metadata findings were truncated at ${this.#limits.maxFindings} entries or ${this.#limits.maxFindingTextChars} text characters.`,
);
return;
}
this.#keys.add(key);
this.#textChars += addedText;
this.findings.push({
...finding,
source,
label,
id:
finding.id ??
`${source.toLowerCase().replace(/[^a-z0-9]+/gu, "-")}-${this.findings.length + 1}`,
value,
});
}
warn(message: string): void {
if (!this.warnings.includes(message)) this.warnings.push(message);
}
}
function boundedLabel(value: string, maximum: number): string {
const sanitized = sanitizeText(value);
return sanitized.length <= maximum
? sanitized
: `${sanitized.slice(0, Math.max(0, maximum - 1))}…`;
}
export function categoryForName(name: string): {
category: FindingCategory;
risk: FindingRisk;
} {
const normalized = name.toLowerCase();
if (
/(?:gps|latitude|longitude|location|city|country|province|state|sublocation|altitude)/u.test(
normalized,
)
)
return { category: "location", risk: "sensitive" };
if (
/(?:artist|author|creator|byline|credit|owner|person|copyright|rights|email)/u.test(
normalized,
)
)
return { category: "identity", risk: "sensitive" };
if (/(?:date|time|created|modified|timestamp)/u.test(normalized))
return { category: "timestamp", risk: "sensitive" };
if (
/(?:serial|camera|device|make|model|lens|makernote|ownername)/u.test(
normalized,
)
)
return { category: "device", risk: "sensitive" };
if (
/(?:software|history|creatortool|processing|hostcomputer)/u.test(normalized)
)
return { category: "software", risk: "sensitive" };
if (
/(?:documentid|instanceid|uniqueid|originaldocumentid|assetid)/u.test(
normalized,
)
)
return { category: "document-id", risk: "sensitive" };
if (
/(?:comment|description|caption|headline|keyword|subject|title)/u.test(
normalized,
)
)
return { category: "comment", risk: "context" };
if (/(?:thumbnail|preview)/u.test(normalized))
return { category: "thumbnail", risk: "sensitive" };
if (/(?:icc|profile|colorspace|colourspace)/u.test(normalized))
return { category: "colour-profile", risk: "technical" };
if (/(?:c2pa|jumbf|provenance|manifest|signature)/u.test(normalized))
return { category: "provenance", risk: "context" };
if (
/(?:orientation|resolution|jfif|density|dimensions|pixel)/u.test(normalized)
)
return { category: "technical", risk: "technical" };
return { category: "unknown", risk: "context" };
}
function displayValue(value: unknown): string {
if (value == null) return "";
if (typeof value === "string") return sanitizeText(value);
if (typeof value === "number" || typeof value === "bigint")
return String(value);
if (typeof value === "boolean") return value ? "Yes" : "No";
if (value instanceof Uint8Array) return `${value.byteLength} bytes`;
if (Array.isArray(value)) return value.map(displayValue).join(", ");
try {
return sanitizeText(JSON.stringify(value));
} catch {
return String(value);
}
}
function sanitizeText(value: string): string {
return Array.from(value, (character) => {
const point = character.codePointAt(0) ?? 0;
if (point === 0) return "�";
if ((point >= 1 && point <= 8) || point === 11 || point === 12) return " ";
if ((point >= 14 && point <= 31) || point === 127) return " ";
return character;
})
.join("")
.trim();
}
src/privacy/index.ts
+7
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@@ -0,0 +1,7 @@
export * from "./archive";
export * from "./detect";
export * from "./limits";
export * from "./model";
export * from "./sanitize";
export * from "./scan-client";
export * from "./scanner";
src/privacy/inflate.ts
+29
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@@ -0,0 +1,29 @@
import { Unzlib } from "fflate";
import { PrivacyLimitError } from "./limits";
export function inflateZlibBounded(
input: Uint8Array,
maximumBytes: number,
): Uint8Array {
const chunks: Uint8Array[] = [];
let total = 0;
const inflater = new Unzlib((chunk) => {
total += chunk.byteLength;
if (total > maximumBytes)
throw new PrivacyLimitError(
"Inflated metadata size",
total,
maximumBytes,
);
chunks.push(chunk.slice());
});
inflater.push(input, true);
const output = new Uint8Array(total);
let offset = 0;
for (const chunk of chunks) {
output.set(chunk, offset);
offset += chunk.byteLength;
}
return output;
}
src/privacy/iptc.ts
+128
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import { categoryForName, FindingCollector } from "./findings";
const DATASET_NAMES: Readonly<Record<number, string>> = Object.freeze({
5: "Object Name",
25: "Keywords",
55: "Date Created",
60: "Time Created",
80: "By-line",
85: "By-line Title",
90: "City",
92: "Sublocation",
95: "Province/State",
100: "Country Code",
101: "Country",
105: "Headline",
110: "Credit",
115: "Source",
116: "Copyright Notice",
120: "Caption/Abstract",
122: "Writer/Editor",
});
export function scanIptc(
bytes: Uint8Array,
source: string,
baseOffset: number,
collector: FindingCollector,
): void {
let offset = 0;
let datasets = 0;
while (offset + 5 <= bytes.byteLength) {
if (bytes[offset] !== 0x1c) {
offset += 1;
continue;
}
const record = bytes[offset + 1] ?? 0;
const dataset = bytes[offset + 2] ?? 0;
let length = ((bytes[offset + 3] ?? 0) << 8) | (bytes[offset + 4] ?? 0);
let header = 5;
if ((length & 0x8000) !== 0) {
const lengthBytes = length & 0x7fff;
if (
lengthBytes < 1 ||
lengthBytes > 4 ||
offset + 5 + lengthBytes > bytes.byteLength
) {
collector.warn(`${source} contains an invalid extended IPTC length.`);
return;
}
length = 0;
for (let index = 0; index < lengthBytes; index += 1)
length = length * 256 + (bytes[offset + 5 + index] ?? 0);
header += lengthBytes;
}
if (length > 1024 * 1024 || offset + header + length > bytes.byteLength) {
collector.warn(
`${source} contains a truncated or oversized IPTC dataset.`,
);
return;
}
const valueBytes = bytes.subarray(
offset + header,
offset + header + length,
);
const label =
record === 2
? (DATASET_NAMES[dataset] ?? `IPTC 2:${dataset}`)
: `IPTC ${record}:${dataset}`;
const classification = categoryForName(label);
collector.add({
...classification,
source,
label,
value: new TextDecoder("utf-8", { fatal: false }).decode(valueBytes),
offset: baseOffset + offset,
length: header + length,
});
datasets += 1;
if (datasets > 2048) {
collector.warn(`${source} IPTC dataset count exceeded 2048.`);
return;
}
offset += header + length;
}
}
export function findPhotoshopIptc(
bytes: Uint8Array,
): Array<{ bytes: Uint8Array; relativeOffset: number }> {
const result: Array<{ bytes: Uint8Array; relativeOffset: number }> = [];
let offset = bytes.byteLength >= 14 ? 14 : 0;
while (offset + 12 <= bytes.byteLength) {
if (
bytes[offset] !== 0x38 ||
bytes[offset + 1] !== 0x42 ||
bytes[offset + 2] !== 0x49 ||
bytes[offset + 3] !== 0x4d
) {
offset += 1;
continue;
}
const resource = ((bytes[offset + 4] ?? 0) << 8) | (bytes[offset + 5] ?? 0);
const nameLength = bytes[offset + 6] ?? 0;
const paddedName = 1 + nameLength + ((1 + nameLength) % 2);
const sizeOffset = offset + 6 + paddedName;
if (sizeOffset + 4 > bytes.byteLength) break;
const length = readU32be(bytes, sizeOffset);
const dataOffset = sizeOffset + 4;
if (length > 8 * 1024 * 1024 || dataOffset + length > bytes.byteLength)
break;
if (resource === 0x0404)
result.push({
bytes: bytes.subarray(dataOffset, dataOffset + length),
relativeOffset: dataOffset,
});
offset = dataOffset + length + (length % 2);
}
return result;
}
function readU32be(bytes: Uint8Array, offset: number): number {
return (
(bytes[offset] ?? 0) * 0x1000000 +
((bytes[offset + 1] ?? 0) << 16) +
((bytes[offset + 2] ?? 0) << 8) +
(bytes[offset + 3] ?? 0)
);
}
src/privacy/jpeg.ts
+323
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import { FindingCollector } from "./findings";
import { findPhotoshopIptc, scanIptc } from "./iptc";
import type { MetadataBlock, PrivacyLimits } from "./model";
import { scanTiff } from "./tiff";
import { decodeMetadataText, scanXmp } from "./xmp";
export interface FormatScan {
width?: number;
height?: number;
orientation?: number;
animated: boolean;
multiImage: boolean;
complete: boolean;
blocks: MetadataBlock[];
}
const XMP_HEADER = "http://ns.adobe.com/xap/1.0/\u0000";
const XMP_EXTENDED_HEADER = "http://ns.adobe.com/xmp/extension/\u0000";
export function scanJpeg(
bytes: Uint8Array,
collector: FindingCollector,
limits: Readonly<PrivacyLimits>,
): FormatScan {
const blocks: MetadataBlock[] = [];
if (bytes.byteLength < 4 || bytes[0] !== 0xff || bytes[1] !== 0xd8) {
collector.warn("JPEG start-of-image marker is missing.");
return { animated: false, multiImage: false, complete: false, blocks };
}
let offset = 2;
let complete = true;
let width: number | undefined;
let height: number | undefined;
let orientation: number | undefined;
let multiImage = false;
let segments = 0;
let enteredScan = false;
while (offset < bytes.byteLength) {
if (bytes[offset] !== 0xff) {
collector.warn(`JPEG marker sync was lost at byte ${offset}.`);
complete = false;
break;
}
while (offset < bytes.byteLength && bytes[offset] === 0xff) offset += 1;
if (offset >= bytes.byteLength) {
complete = false;
break;
}
const marker = bytes[offset] ?? 0;
offset += 1;
if (marker === 0xd9) break;
if (marker === 0xda) {
enteredScan = true;
break;
}
if (marker === 0x01 || (marker >= 0xd0 && marker <= 0xd8)) continue;
if (offset + 2 > bytes.byteLength) {
collector.warn("JPEG segment length is truncated.");
complete = false;
break;
}
const segmentLength =
((bytes[offset] ?? 0) << 8) | (bytes[offset + 1] ?? 0);
if (segmentLength < 2 || offset + segmentLength > bytes.byteLength) {
collector.warn(
`JPEG marker 0x${marker.toString(16)} has an invalid length.`,
);
complete = false;
break;
}
segments += 1;
if (segments > limits.maxMetadataBlocks) {
collector.warn(
`JPEG segment count exceeded ${limits.maxMetadataBlocks}.`,
);
complete = false;
break;
}
const dataOffset = offset + 2;
const dataLength = segmentLength - 2;
const data = bytes.subarray(dataOffset, dataOffset + dataLength);
if (isStartOfFrame(marker) && data.byteLength >= 5) {
height = ((data[1] ?? 0) << 8) | (data[2] ?? 0);
width = ((data[3] ?? 0) << 8) | (data[4] ?? 0);
}
if (marker >= 0xe0 && marker <= 0xef) {
if (dataLength > limits.maxMetadataBlockBytes) {
collector.warn(
`JPEG APP${marker - 0xe0} metadata exceeds the block limit.`,
);
complete = false;
} else {
blocks.push({
kind: `APP${marker - 0xe0}`,
offset: dataOffset,
length: dataLength,
});
const result = scanJpegApplication(
marker,
data,
dataOffset,
collector,
limits,
);
if (result.orientation !== undefined) orientation = result.orientation;
multiImage ||= result.multiImage;
complete &&= result.complete;
}
} else if (marker === 0xfe) {
blocks.push({ kind: "COM", offset: dataOffset, length: dataLength });
collector.add({
category: "comment",
risk: "context",
source: "JPEG COM",
label: "Comment",
value: decodeMetadataText(data),
offset: dataOffset,
length: dataLength,
});
}
offset += segmentLength;
}
const eoi = enteredScan
? findJpegEnd(bytes, offset)
: bytes.lastIndexOf(0xd9);
if (eoi < 1 || bytes[eoi - 1] !== 0xff) {
collector.warn("JPEG end-of-image marker was not found.");
complete = false;
} else if (eoi + 1 < bytes.byteLength) {
const trailing = bytes.byteLength - eoi - 1;
blocks.push({ kind: "trailing-data", offset: eoi + 1, length: trailing });
collector.add({
category: "unknown",
risk: "sensitive",
source: "JPEG",
label: "Trailing data",
value: `${trailing} bytes after end-of-image`,
offset: eoi + 1,
length: trailing,
});
}
return {
width,
height,
orientation,
animated: false,
multiImage,
complete,
blocks,
};
}
function scanJpegApplication(
marker: number,
data: Uint8Array,
offset: number,
collector: FindingCollector,
limits: Readonly<PrivacyLimits>,
): { orientation?: number; multiImage: boolean; complete: boolean } {
if (marker === 0xe0 && ascii(data, 0, 5) === "JFIF\u0000") {
const thumbnailWidth = data[12] ?? 0;
const thumbnailHeight = data[13] ?? 0;
collector.add({
category: thumbnailWidth && thumbnailHeight ? "thumbnail" : "technical",
risk: thumbnailWidth && thumbnailHeight ? "sensitive" : "technical",
source: "JPEG APP0",
label: "JFIF header",
value: `version ${data[5] ?? 0}.${String(data[6] ?? 0).padStart(2, "0")}; density ${readU16be(data, 8)}×${readU16be(data, 10)}; thumbnail ${thumbnailWidth}×${thumbnailHeight}`,
offset,
length: data.byteLength,
});
return { multiImage: false, complete: true };
}
if (marker === 0xe1 && ascii(data, 0, 6) === "Exif\u0000\u0000") {
const result = scanTiff(
data.subarray(6),
"JPEG EXIF",
offset + 6,
collector,
limits,
);
return {
orientation: result.orientation,
multiImage: false,
complete: result.complete,
};
}
if (marker === 0xe1 && ascii(data, 0, XMP_HEADER.length) === XMP_HEADER) {
scanXmp(data.subarray(XMP_HEADER.length), "JPEG XMP", offset, collector);
return { multiImage: false, complete: true };
}
if (
marker === 0xe1 &&
ascii(data, 0, XMP_EXTENDED_HEADER.length) === XMP_EXTENDED_HEADER
) {
scanXmp(
data.subarray(XMP_EXTENDED_HEADER.length),
"JPEG extended XMP",
offset,
collector,
);
return { multiImage: false, complete: true };
}
if (marker === 0xed && ascii(data, 0, 13) === "Photoshop 3.0") {
const resources = findPhotoshopIptc(data);
for (const resource of resources)
scanIptc(
resource.bytes,
"JPEG IPTC",
offset + resource.relativeOffset,
collector,
);
if (resources.length === 0)
collector.add({
category: "unknown",
risk: "context",
source: "JPEG APP13",
label: "Photoshop image resources",
value: `${data.byteLength} bytes`,
offset,
length: data.byteLength,
});
return { multiImage: false, complete: true };
}
if (marker === 0xe2 && ascii(data, 0, 12) === "ICC_PROFILE\u0000") {
collector.add({
category: "colour-profile",
risk: "technical",
source: "JPEG APP2",
label: "ICC profile chunk",
value: `chunk ${data[12] ?? 0} of ${data[13] ?? 0}; ${Math.max(0, data.byteLength - 14)} bytes`,
offset,
length: data.byteLength,
});
return { multiImage: false, complete: true };
}
if (marker === 0xe2 && ascii(data, 0, 4) === "MPF\u0000") {
collector.add({
category: "thumbnail",
risk: "sensitive",
source: "JPEG APP2",
label: "Multi-Picture Format",
value: `${data.byteLength} bytes; additional images may be embedded`,
offset,
length: data.byteLength,
});
return { multiImage: true, complete: true };
}
if (marker === 0xeb && containsAscii(data, ["jumb", "c2pa"])) {
collector.add({
category: "provenance",
risk: "context",
source: "JPEG APP11",
label: "JUMBF / C2PA provenance data",
value: `${data.byteLength} bytes; re-encoding will remove or invalidate this provenance`,
offset,
length: data.byteLength,
});
return { multiImage: false, complete: true };
}
if (marker === 0xee && ascii(data, 0, 5) === "Adobe") {
collector.add({
category: "technical",
risk: "technical",
source: "JPEG APP14",
label: "Adobe colour transform header",
value: `${data.byteLength} bytes`,
offset,
length: data.byteLength,
});
return { multiImage: false, complete: true };
}
collector.add({
category: containsAscii(data, ["c2pa", "jumb"]) ? "provenance" : "unknown",
risk: "context",
source: `JPEG APP${marker - 0xe0}`,
label: "Unrecognized application metadata",
value: `${data.byteLength} bytes`,
offset,
length: data.byteLength,
});
return { multiImage: false, complete: true };
}
function isStartOfFrame(marker: number): boolean {
return (
marker >= 0xc0 && marker <= 0xcf && ![0xc4, 0xc8, 0xcc].includes(marker)
);
}
function findJpegEnd(bytes: Uint8Array, offset: number): number {
for (let index = offset; index + 1 < bytes.byteLength; index += 1) {
if (bytes[index] !== 0xff) continue;
const marker = bytes[index + 1] ?? 0;
if (marker === 0x00 || (marker >= 0xd0 && marker <= 0xd7)) {
index += 1;
continue;
}
if (marker === 0xd9) return index + 1;
}
return -1;
}
function ascii(bytes: Uint8Array, offset: number, length: number): string {
if (offset < 0 || offset + length > bytes.byteLength) return "";
let result = "";
for (let index = 0; index < length; index += 1)
result += String.fromCharCode(bytes[offset + index] ?? 0);
return result;
}
function containsAscii(bytes: Uint8Array, needles: readonly string[]): boolean {
const sample = ascii(
bytes.subarray(0, Math.min(bytes.byteLength, 4096)),
0,
Math.min(bytes.byteLength, 4096),
).toLowerCase();
return needles.some((needle) => sample.includes(needle));
}
function readU16be(bytes: Uint8Array, offset: number): number {
return ((bytes[offset] ?? 0) << 8) | (bytes[offset + 1] ?? 0);
}
src/privacy/limits.ts
+73
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import type { PrivacyLimits } from "./model";
export const DEFAULT_PRIVACY_LIMITS: Readonly<PrivacyLimits> = Object.freeze({
maxFiles: 100,
maxFileBytes: 128 * 1024 * 1024,
maxBatchBytes: 512 * 1024 * 1024,
maxMetadataBlocks: 4096,
maxMetadataBlockBytes: 8 * 1024 * 1024,
maxInflatedMetadataBytes: 4 * 1024 * 1024,
maxFindingLabelChars: 512,
maxFindingValueChars: 16_384,
maxFindingTextChars: 256 * 1024,
maxFindings: 4096,
maxTiffEntries: 4096,
maxTiffDepth: 16,
maxPixels: 40_000_000,
maxEdge: 32_768,
maxZipBytes: 256 * 1024 * 1024,
});
export class PrivacyLimitError extends RangeError {
readonly actual: number;
readonly limit: number;
constructor(label: string, actual: number, limit: number) {
super(`${label} is ${actual}; the limit is ${limit}`);
this.name = "PrivacyLimitError";
this.actual = actual;
this.limit = limit;
}
}
export function assertLimit(
actual: number,
limit: number,
label: string,
): void {
if (!Number.isSafeInteger(actual) || actual < 0)
throw new TypeError(`${label} is not a valid non-negative integer`);
if (!Number.isSafeInteger(limit) || limit <= 0)
throw new TypeError(`${label} limit is not a positive safe integer`);
if (actual > limit) throw new PrivacyLimitError(label, actual, limit);
}
export function resolveLimits(
overrides: Partial<PrivacyLimits> = {},
): Readonly<PrivacyLimits> {
const merged = { ...DEFAULT_PRIVACY_LIMITS, ...overrides };
for (const [name, value] of Object.entries(merged)) {
if (!Number.isSafeInteger(value) || value <= 0)
throw new TypeError(`${name} must be a positive safe integer`);
}
return Object.freeze(merged);
}
export function assertBatchFiles(
files: readonly { size: number }[],
limits: Readonly<PrivacyLimits> = DEFAULT_PRIVACY_LIMITS,
): void {
assertLimit(files.length, limits.maxFiles, "File count");
let total = 0;
for (const file of files) {
assertLimit(file.size, limits.maxFileBytes, "File size");
total += file.size;
if (!Number.isSafeInteger(total))
throw new PrivacyLimitError(
"Batch byte size",
Number.MAX_SAFE_INTEGER,
limits.maxBatchBytes,
);
assertLimit(total, limits.maxBatchBytes, "Batch byte size");
}
}
src/privacy/model.ts
+156
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export type DetectedKind =
| "jpeg"
| "png"
| "webp"
| "gif"
| "tiff"
| "heic"
| "avif"
| "jxl"
| "pdf"
| "zip"
| "ole"
| "unknown";
export type FindingCategory =
| "location"
| "identity"
| "timestamp"
| "device"
| "software"
| "document-id"
| "comment"
| "thumbnail"
| "colour-profile"
| "provenance"
| "technical"
| "unknown";
export type FindingRisk = "sensitive" | "context" | "technical";
export interface MetadataFinding {
id: string;
category: FindingCategory;
risk: FindingRisk;
source: string;
label: string;
value: string;
offset?: number;
length?: number;
}
export interface MetadataBlock {
kind: string;
offset: number;
length: number;
}
export interface ParserCoverage {
projectScanner: "complete" | "partial" | "unsupported";
secondaryScanner: "complete" | "partial" | "unsupported" | "failed";
notes: string[];
}
export interface InventoryIdentity {
claimedType: string;
extension: string;
detectedKind: DetectedKind;
detectedType: string;
typeMatch: "match" | "mismatch" | "unclaimed" | "unknown";
}
export interface ImageScanResult {
id: string;
name: string;
safeName: string;
size: number;
lastModified: number;
sha256: string;
identity: InventoryIdentity;
width?: number;
height?: number;
orientation?: number;
animated: boolean;
multiImage: boolean;
deepSupported: boolean;
cleanable: boolean;
findings: MetadataFinding[];
blocks: MetadataBlock[];
warnings: string[];
coverage: ParserCoverage;
}
export interface ScanInput {
id: string;
name: string;
claimedType: string;
size: number;
lastModified: number;
bytes: ArrayBuffer;
}
export type SanitizationStatus = "verified" | "warning" | "failed";
export interface PixelComparison {
method: "oriented-256px-sample";
sourceDigest: string;
outputDigest: string;
identical: boolean;
note: string;
}
export interface SanitizationReport {
sourceId: string;
sourceName: string;
outputName: string;
outputType: string;
sourceSha256: string;
outputSha256: string;
sourceBytes: number;
outputBytes: number;
sourceDimensions?: { width: number; height: number };
outputDimensions?: { width: number; height: number };
orientationNormalized: boolean;
removed: MetadataFinding[];
preserved: MetadataFinding[];
generated: MetadataFinding[];
unsupported: string[];
incomplete: string[];
outputScan: ImageScanResult;
pixelComparison: PixelComparison;
status: SanitizationStatus;
summary: string;
disclaimer: string;
}
export interface SanitizedAsset {
blob: Blob;
report: SanitizationReport;
}
export interface BatchReport {
schemaVersion: 1;
generatedAt: string;
application: { name: "Privacy Tools"; version: "0.1.0" };
files: ImageScanResult[];
sanitizations: SanitizationReport[];
warnings: string[];
}
export interface PrivacyLimits {
maxFiles: number;
maxFileBytes: number;
maxBatchBytes: number;
maxMetadataBlocks: number;
maxMetadataBlockBytes: number;
maxInflatedMetadataBytes: number;
maxFindingLabelChars: number;
maxFindingValueChars: number;
maxFindingTextChars: number;
maxFindings: number;
maxTiffEntries: number;
maxTiffDepth: number;
maxPixels: number;
maxEdge: number;
maxZipBytes: number;
}
src/privacy/png.ts
+359
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import { crc32 } from "@add-ideas/toolbox-helpers";
import { FindingCollector } from "./findings";
import { inflateZlibBounded } from "./inflate";
import type { MetadataBlock, PrivacyLimits } from "./model";
import type { FormatScan } from "./jpeg";
import { scanTiff } from "./tiff";
import { decodeMetadataText, scanXmp } from "./xmp";
export function scanPng(
bytes: Uint8Array,
collector: FindingCollector,
limits: Readonly<PrivacyLimits>,
): FormatScan {
const blocks: MetadataBlock[] = [];
let offset = 8;
let width: number | undefined;
let height: number | undefined;
let orientation: number | undefined;
let animated = false;
let complete = true;
let chunks = 0;
let sawEnd = false;
let sawHeader = false;
let sawImageData = false;
while (offset + 12 <= bytes.byteLength) {
const length = readU32be(bytes, offset);
const type = ascii(bytes, offset + 4, 4);
const dataOffset = offset + 8;
const end = dataOffset + length;
if (!/^[A-Za-z]{4}$/u.test(type) || end + 4 > bytes.byteLength) {
collector.warn(`PNG chunk at byte ${offset} is malformed or truncated.`);
complete = false;
break;
}
chunks += 1;
if (chunks > limits.maxMetadataBlocks) {
collector.warn(`PNG chunk count exceeded ${limits.maxMetadataBlocks}.`);
complete = false;
break;
}
const data = bytes.subarray(dataOffset, end);
const expectedCrc = readU32be(bytes, end);
const crcInput = bytes.subarray(offset + 4, end);
if (crc32(crcInput, limits.maxFileBytes) !== expectedCrc) {
collector.warn(`PNG ${type} chunk at byte ${offset} has an invalid CRC.`);
complete = false;
}
if (chunks === 1 && type !== "IHDR") {
collector.warn("PNG IHDR is not the first chunk.");
complete = false;
}
if (type === "IHDR") {
if (sawHeader || chunks !== 1 || length !== 13) {
collector.warn("PNG IHDR is duplicated, misplaced, or malformed.");
complete = false;
} else {
width = readU32be(data, 0);
height = readU32be(data, 4);
}
sawHeader = true;
} else if (type === "IDAT") {
sawImageData = true;
} else if (type === "IEND") {
if (length !== 0) {
collector.warn("PNG IEND chunk is not empty.");
complete = false;
}
sawEnd = true;
offset = end + 4;
break;
} else if (type === "acTL" || type === "fcTL" || type === "fdAT") {
animated = true;
blocks.push({ kind: type, offset: dataOffset, length });
collector.add({
category: "technical",
risk: "context",
source: "PNG",
label: "APNG animation",
value: `${type} chunk (${length} bytes)`,
offset: dataOffset,
length,
});
} else if (isMetadataChunk(type)) {
if (length > limits.maxMetadataBlockBytes) {
collector.warn(`PNG ${type} metadata exceeds the block limit.`);
complete = false;
} else {
blocks.push({ kind: type, offset: dataOffset, length });
const result = scanPngMetadata(
type,
data,
dataOffset,
collector,
limits,
);
if (result.orientation !== undefined) orientation = result.orientation;
complete &&= result.complete;
}
} else if (type[1] === type[1]?.toLowerCase()) {
blocks.push({ kind: type, offset: dataOffset, length });
collector.add({
category: type === "caBX" ? "provenance" : "unknown",
risk: "context",
source: "PNG",
label:
type === "caBX" ? "C2PA provenance chunk" : `Private chunk ${type}`,
value: `${length} bytes`,
offset: dataOffset,
length,
});
}
offset = end + 4;
}
if (!sawEnd) {
collector.warn("PNG IEND chunk was not found.");
complete = false;
} else if (offset < bytes.byteLength) {
const trailing = bytes.byteLength - offset;
blocks.push({ kind: "trailing-data", offset, length: trailing });
collector.add({
category: "unknown",
risk: "sensitive",
source: "PNG",
label: "Trailing data",
value: `${trailing} bytes after IEND`,
offset,
length: trailing,
});
}
if (!sawHeader) {
collector.warn("PNG IHDR chunk was not found.");
complete = false;
}
if (!sawImageData) {
collector.warn("PNG IDAT image data was not found.");
complete = false;
}
return {
width,
height,
orientation,
animated,
multiImage: false,
complete,
blocks,
};
}
function scanPngMetadata(
type: string,
data: Uint8Array,
offset: number,
collector: FindingCollector,
limits: Readonly<PrivacyLimits>,
): { orientation?: number; complete: boolean } {
try {
if (type === "eXIf") {
const result = scanTiff(data, "PNG eXIf", offset, collector, limits);
return { orientation: result.orientation, complete: result.complete };
}
if (type === "tEXt") {
const separator = data.indexOf(0);
const keyword = decodeLatin(
data.subarray(0, separator < 0 ? data.length : separator),
);
const value =
separator < 0 ? "" : decodeLatin(data.subarray(separator + 1));
addPngText(keyword, value, type, offset, data.byteLength, collector);
} else if (type === "zTXt") {
const separator = data.indexOf(0);
if (separator < 0 || data[separator + 1] !== 0)
throw new SyntaxError("invalid zTXt header");
const keyword = decodeLatin(data.subarray(0, separator));
const inflated = inflateZlibBounded(
data.subarray(separator + 2),
limits.maxInflatedMetadataBytes,
);
addPngText(
keyword,
decodeLatin(inflated),
type,
offset,
data.byteLength,
collector,
);
} else if (type === "iTXt") {
const parsed = parseInternationalText(
data,
limits.maxInflatedMetadataBytes,
);
addPngText(
parsed.keyword,
parsed.text,
type,
offset,
data.byteLength,
collector,
);
} else if (type === "iCCP") {
const separator = data.indexOf(0);
if (separator < 0 || data[separator + 1] !== 0)
throw new SyntaxError("invalid iCCP header");
const profile = inflateZlibBounded(
data.subarray(separator + 2),
limits.maxInflatedMetadataBytes,
);
collector.add({
category: "colour-profile",
risk: "technical",
source: "PNG iCCP",
label: "ICC profile",
value: `${decodeLatin(data.subarray(0, separator)) || "unnamed"}; ${profile.byteLength} bytes inflated`,
offset,
length: data.byteLength,
});
} else if (type === "pHYs") {
collector.add({
category: "technical",
risk: "technical",
source: "PNG pHYs",
label: "Pixel density",
value: `${readU32be(data, 0)}×${readU32be(data, 4)} per ${data[8] === 1 ? "metre" : "unknown unit"}`,
offset,
length: data.byteLength,
});
} else if (type === "tIME" && data.byteLength === 7) {
collector.add({
category: "timestamp",
risk: "sensitive",
source: "PNG tIME",
label: "Last modification time",
value: `${readU16be(data, 0)}-${pad(data[2])}-${pad(data[3])} ${pad(data[4])}:${pad(data[5])}:${pad(data[6])} UTC-like fields`,
offset,
length: data.byteLength,
});
} else if (type === "caBX") {
collector.add({
category: "provenance",
risk: "context",
source: "PNG caBX",
label: "C2PA provenance data",
value: `${data.byteLength} bytes; re-encoding will remove or invalidate this provenance`,
offset,
length: data.byteLength,
});
}
return { complete: true };
} catch (error) {
collector.warn(
`PNG ${type} metadata could not be fully read: ${error instanceof Error ? error.message : "unknown error"}.`,
);
return { complete: false };
}
}
function addPngText(
keyword: string,
value: string,
type: string,
offset: number,
length: number,
collector: FindingCollector,
): void {
if (/xmp/iu.test(keyword) || /<\?xpacket|<rdf:/iu.test(value)) {
scanXmp(value, `PNG ${type} (${keyword || "XMP"})`, offset, collector);
return;
}
const normalized = keyword.toLowerCase();
const category = /author|copyright|creator/iu.test(keyword)
? "identity"
: /date|time/iu.test(keyword)
? "timestamp"
: /software/iu.test(keyword)
? "software"
: /description|comment|title|keyword/iu.test(keyword)
? "comment"
: normalized === "raw profile type exif"
? "device"
: "unknown";
collector.add({
category,
risk: category === "unknown" ? "context" : "sensitive",
source: `PNG ${type}`,
label: keyword || "Text entry",
value,
offset,
length,
});
}
function parseInternationalText(
data: Uint8Array,
maximumInflatedBytes: number,
): { keyword: string; text: string } {
const first = data.indexOf(0);
if (first < 0 || first + 2 >= data.byteLength)
throw new SyntaxError("invalid iTXt header");
const compressed = data[first + 1] === 1;
if ((data[first + 1] !== 0 && !compressed) || data[first + 2] !== 0)
throw new SyntaxError("unsupported iTXt compression");
const languageEnd = data.indexOf(0, first + 3);
if (languageEnd < 0) throw new SyntaxError("truncated iTXt language tag");
const translatedEnd = data.indexOf(0, languageEnd + 1);
if (translatedEnd < 0)
throw new SyntaxError("truncated iTXt translated keyword");
const payload = data.subarray(translatedEnd + 1);
return {
keyword: decodeLatin(data.subarray(0, first)),
text: decodeMetadataText(
compressed ? inflateZlibBounded(payload, maximumInflatedBytes) : payload,
),
};
}
function isMetadataChunk(type: string): boolean {
return [
"tEXt",
"zTXt",
"iTXt",
"eXIf",
"iCCP",
"pHYs",
"tIME",
"caBX",
].includes(type);
}
function readU32be(bytes: Uint8Array, offset: number): number {
return (
(bytes[offset] ?? 0) * 0x1000000 +
((bytes[offset + 1] ?? 0) << 16) +
((bytes[offset + 2] ?? 0) << 8) +
(bytes[offset + 3] ?? 0)
);
}
function readU16be(bytes: Uint8Array, offset: number): number {
return ((bytes[offset] ?? 0) << 8) | (bytes[offset + 1] ?? 0);
}
function ascii(bytes: Uint8Array, offset: number, length: number): string {
let value = "";
for (
let index = 0;
index < length && offset + index < bytes.length;
index += 1
)
value += String.fromCharCode(bytes[offset + index] ?? 0);
return value;
}
function decodeLatin(bytes: Uint8Array): string {
return new TextDecoder("latin1", { fatal: false }).decode(bytes);
}
function pad(value: number | undefined): string {
return String(value ?? 0).padStart(2, "0");
}
src/privacy/sanitize.ts
+435
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@@ -0,0 +1,435 @@
import {
digestHex,
sanitizeDownloadFilename,
} from "@add-ideas/toolbox-helpers";
import type {
ImageScanResult,
MetadataFinding,
PixelComparison,
SanitizedAsset,
SanitizationReport,
} from "./model";
import { scanImageBytes } from "./scanner";
export interface SanitizeOptions {
jpegQuality?: number;
webpQuality?: number;
signal?: AbortSignal;
}
export async function sanitizeStaticImage(
file: File,
source: ImageScanResult,
options: SanitizeOptions = {},
): Promise<SanitizedAsset> {
if (!source.cleanable)
throw new TypeError(
`${source.name} is not a supported static clean-copy input.`,
);
if (source.coverage.projectScanner !== "complete")
throw new TypeError("The source project scan is not complete.");
if (file.size !== source.size || file.name !== source.name)
throw new TypeError(
"The selected source file no longer matches its scan result.",
);
throwIfAborted(options.signal);
await verifySourceHash(file, source);
throwIfAborted(options.signal);
const mime = outputMime(source.identity.detectedKind);
const decoded = await decodeDrawable(file, source, options.signal);
const canvas = document.createElement("canvas");
canvas.width = decoded.outputWidth;
canvas.height = decoded.outputHeight;
const context = canvas.getContext("2d", {
alpha: true,
colorSpace: "srgb",
willReadFrequently: false,
});
if (!context) throw new Error("The browser did not provide a 2D canvas.");
context.save();
applyOrientationTransform(
context,
decoded.orientationToApply,
decoded.rawWidth,
decoded.rawHeight,
);
context.drawImage(decoded.drawable, 0, 0);
context.restore();
decoded.close();
throwIfAborted(options.signal);
const sourceSample = await sampleDigest(canvas);
const quality =
mime === "image/jpeg"
? boundedQuality(options.jpegQuality ?? 0.92)
: mime === "image/webp"
? boundedQuality(options.webpQuality ?? 0.92)
: undefined;
const blob = await canvasToBlob(canvas, mime, quality);
if (blob.type !== mime)
throw new Error(
`This browser encoded ${blob.type || "an unknown format"} instead of ${mime}.`,
);
throwIfAborted(options.signal);
const outputBytes = await blob.arrayBuffer();
const outputName = cleanOutputName(
source.safeName,
source.identity.detectedKind,
);
const outputScan = await scanImageBytes({
id: `${source.id}-clean`,
name: outputName,
claimedType: mime,
size: outputBytes.byteLength,
lastModified: 0,
bytes: outputBytes,
});
const outputSample = await sampleBlobDigest(blob);
const pixelComparison: PixelComparison = {
method: "oriented-256px-sample",
sourceDigest: sourceSample,
outputDigest: outputSample,
identical: sourceSample === outputSample,
note:
mime === "image/png"
? "The decoded, orientation-normalized sample should normally be identical."
: "JPEG and lossy WebP encoding may change decoded sample pixels even when the visible image is preserved.",
};
const report = buildSanitizationReport(
source,
outputScan,
outputName,
mime,
blob.size,
pixelComparison,
);
return { blob, report };
}
export function buildSanitizationReport(
source: ImageScanResult,
output: ImageScanResult,
outputName: string,
outputType: string,
outputBytes: number,
pixelComparison: PixelComparison,
): SanitizationReport {
const outputKeys = new Set(output.findings.map(findingSignature));
const sourceKeys = new Set(source.findings.map(findingSignature));
const removed = source.findings.filter(
(finding) => !outputKeys.has(findingSignature(finding)),
);
const preserved = source.findings.filter((finding) =>
outputKeys.has(findingSignature(finding)),
);
const generated = output.findings.filter(
(finding) => !sourceKeys.has(findingSignature(finding)),
);
const unsupported: string[] = [];
const incomplete: string[] = [];
if (source.coverage.projectScanner !== "complete")
incomplete.push(
"The source project scanner did not reach complete coverage.",
);
if (source.coverage.secondaryScanner !== "complete")
incomplete.push(
`The source secondary scanner status was ${source.coverage.secondaryScanner}.`,
);
if (output.coverage.projectScanner !== "complete")
incomplete.push(
"The output project scanner did not reach complete coverage.",
);
if (output.coverage.secondaryScanner !== "complete")
incomplete.push(
`The output secondary scanner status was ${output.coverage.secondaryScanner}.`,
);
if (source.findings.some((finding) => finding.category === "provenance"))
unsupported.push(
"Source provenance/signature data was removed or invalidated; authenticity cannot be carried through pixel re-encoding.",
);
const dimensionsMatch =
source.width === undefined ||
source.height === undefined ||
(output.width === expectedWidth(source) &&
output.height === expectedHeight(source));
if (!dimensionsMatch)
incomplete.push(
"Output dimensions do not match the expected oriented dimensions.",
);
const orientationNormalized =
(output.orientation === undefined || output.orientation === 1) &&
dimensionsMatch;
if (!orientationNormalized)
incomplete.push("Output orientation was not normalized to pixel order.");
if (output.identity.typeMatch !== "match")
incomplete.push("Output type, filename, or detected bytes do not agree.");
if (outputType === "image/png" && !pixelComparison.identical)
incomplete.push(
"Lossless PNG output did not preserve the decoded pixel sample.",
);
const unsafeOutput = output.findings.filter(
(finding) =>
finding.risk === "sensitive" ||
finding.category === "comment" ||
finding.category === "provenance",
);
const unexpectedBlocks = findUnexpectedOutputBlocks(output);
if (unexpectedBlocks.length > 0)
incomplete.push(
`Output contains unexpected metadata blocks: ${unexpectedBlocks.join(", ")}.`,
);
const failed =
output.coverage.projectScanner !== "complete" ||
unsafeOutput.length > 0 ||
output.animated ||
output.multiImage ||
!orientationNormalized ||
output.identity.typeMatch !== "match" ||
(outputType === "image/png" && !pixelComparison.identical);
const warning =
incomplete.length > 0 ||
output.coverage.secondaryScanner !== "complete" ||
unsupported.length > 0;
const status = failed ? "failed" : warning ? "warning" : "verified";
return {
sourceId: source.id,
sourceName: source.name,
outputName,
outputType,
sourceSha256: source.sha256,
outputSha256: output.sha256,
sourceBytes: source.size,
outputBytes,
sourceDimensions:
source.width !== undefined && source.height !== undefined
? { width: source.width, height: source.height }
: undefined,
outputDimensions:
output.width !== undefined && output.height !== undefined
? { width: output.width, height: output.height }
: undefined,
orientationNormalized,
removed,
preserved,
generated,
unsupported,
incomplete,
outputScan: output,
pixelComparison,
status,
summary:
status === "verified"
? "The pixel re-encode completed and both bounded output scanners found no sensitive metadata."
: status === "warning"
? "The pixel re-encode completed, but one or more verification limits require review."
: "The output did not pass the mandatory metadata verification gate.",
disclaimer:
"This report is not an anonymity guarantee. Visible faces or text, steganography, invisible watermarks, reverse-image matching, sidecars, filesystem records, and cloud copies are outside this tool's checks.",
};
}
async function verifySourceHash(
file: File,
source: ImageScanResult,
): Promise<void> {
const bytes = new Uint8Array(await file.arrayBuffer());
const currentHash = await digestHex(bytes, "SHA-256", source.size);
if (currentHash !== source.sha256)
throw new TypeError(
"The selected source bytes no longer match their scan hash.",
);
}
function findUnexpectedOutputBlocks(output: ImageScanResult): string[] {
const allowed =
output.identity.detectedKind === "jpeg"
? new Set(["APP0", "APP2"])
: output.identity.detectedKind === "png"
? new Set(["iCCP", "pHYs"])
: output.identity.detectedKind === "webp"
? new Set(["ICCP"])
: new Set<string>();
return [...new Set(output.blocks.map((block) => block.kind))].filter(
(kind) => !allowed.has(kind),
);
}
interface DecodedDrawable {
drawable: CanvasImageSource;
rawWidth: number;
rawHeight: number;
outputWidth: number;
outputHeight: number;
orientationToApply: number;
close(): void;
}
async function decodeDrawable(
file: File,
source: ImageScanResult,
signal?: AbortSignal,
): Promise<DecodedDrawable> {
if ("createImageBitmap" in globalThis) {
const bitmap = await createImageBitmap(file, { imageOrientation: "none" });
throwIfAborted(signal);
const orientation = normalizeOrientation(source.orientation);
const scannerWidth = source.width ?? bitmap.width;
const scannerHeight = source.height ?? bitmap.height;
const browserAlreadyOriented =
swapsAxes(orientation) &&
bitmap.width === scannerHeight &&
bitmap.height === scannerWidth;
const orientationToApply = browserAlreadyOriented ? 1 : orientation;
return {
drawable: bitmap,
rawWidth: bitmap.width,
rawHeight: bitmap.height,
outputWidth: swapsAxes(orientationToApply) ? bitmap.height : bitmap.width,
outputHeight: swapsAxes(orientationToApply)
? bitmap.width
: bitmap.height,
orientationToApply,
close: () => bitmap.close(),
};
}
const url = URL.createObjectURL(file);
try {
const image = new Image();
image.decoding = "async";
image.src = url;
await image.decode();
throwIfAborted(signal);
return {
drawable: image,
rawWidth: image.naturalWidth,
rawHeight: image.naturalHeight,
outputWidth: image.naturalWidth,
outputHeight: image.naturalHeight,
orientationToApply: 1,
close: () => undefined,
};
} finally {
URL.revokeObjectURL(url);
}
}
function applyOrientationTransform(
context: CanvasRenderingContext2D,
orientation: number,
width: number,
height: number,
): void {
if (orientation === 2) context.transform(-1, 0, 0, 1, width, 0);
else if (orientation === 3) context.transform(-1, 0, 0, -1, width, height);
else if (orientation === 4) context.transform(1, 0, 0, -1, 0, height);
else if (orientation === 5) context.transform(0, 1, 1, 0, 0, 0);
else if (orientation === 6) context.transform(0, 1, -1, 0, height, 0);
else if (orientation === 7) context.transform(0, -1, -1, 0, height, width);
else if (orientation === 8) context.transform(0, -1, 1, 0, 0, width);
}
async function sampleDigest(canvas: HTMLCanvasElement): Promise<string> {
const maximum = 256;
const scale = Math.min(1, maximum / canvas.width, maximum / canvas.height);
const width = Math.max(1, Math.round(canvas.width * scale));
const height = Math.max(1, Math.round(canvas.height * scale));
const sample = document.createElement("canvas");
sample.width = width;
sample.height = height;
const context = sample.getContext("2d", { willReadFrequently: true });
if (!context)
throw new Error("The browser could not create a verification canvas.");
context.drawImage(canvas, 0, 0, width, height);
const pixels = context.getImageData(0, 0, width, height).data;
return digestHex(pixels, "SHA-256", maximum * maximum * 4);
}
async function sampleBlobDigest(blob: Blob): Promise<string> {
const bitmap = await createImageBitmap(blob, { imageOrientation: "none" });
try {
const canvas = document.createElement("canvas");
canvas.width = bitmap.width;
canvas.height = bitmap.height;
const context = canvas.getContext("2d");
if (!context)
throw new Error("The browser could not decode output pixels.");
context.drawImage(bitmap, 0, 0);
return sampleDigest(canvas);
} finally {
bitmap.close();
}
}
function canvasToBlob(
canvas: HTMLCanvasElement,
type: string,
quality?: number,
): Promise<Blob> {
return new Promise((resolve, reject) => {
canvas.toBlob(
(blob) => {
if (blob) resolve(blob);
else reject(new Error(`The browser could not encode ${type}.`));
},
type,
quality,
);
});
}
function outputMime(kind: ImageScanResult["identity"]["detectedKind"]): string {
if (kind === "jpeg") return "image/jpeg";
if (kind === "png") return "image/png";
if (kind === "webp") return "image/webp";
throw new TypeError(`No clean-copy encoder is available for ${kind}.`);
}
function cleanOutputName(
input: string,
kind: ImageScanResult["identity"]["detectedKind"],
): string {
const extension = kind === "jpeg" ? "jpg" : kind;
const withoutExtension = input.replace(/\.[^.]*$/u, "") || "image";
return sanitizeDownloadFilename(`${withoutExtension}.clean.${extension}`);
}
function findingSignature(finding: MetadataFinding): string {
const label = finding.label
.toLowerCase()
.replace(/[^a-z0-9]+/gu, " ")
.trim();
return `${finding.category}\u0000${label}\u0000${finding.value}`;
}
function normalizeOrientation(value: number | undefined): number {
return value !== undefined && value >= 1 && value <= 8 ? value : 1;
}
function swapsAxes(orientation: number): boolean {
return orientation >= 5 && orientation <= 8;
}
function expectedWidth(scan: ImageScanResult): number | undefined {
if (scan.width === undefined || scan.height === undefined) return undefined;
return swapsAxes(normalizeOrientation(scan.orientation))
? scan.height
: scan.width;
}
function expectedHeight(scan: ImageScanResult): number | undefined {
if (scan.width === undefined || scan.height === undefined) return undefined;
return swapsAxes(normalizeOrientation(scan.orientation))
? scan.width
: scan.height;
}
function boundedQuality(value: number): number {
if (!Number.isFinite(value) || value < 0.5 || value > 1)
throw new RangeError("Image quality must be between 0.5 and 1.");
return value;
}
function throwIfAborted(signal?: AbortSignal): void {
if (signal?.aborted)
throw new DOMException("Operation cancelled", "AbortError");
}
src/privacy/scan-client.ts
+112
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import { assertBatchFiles } from "./limits";
import type { ImageScanResult, ScanInput } from "./model";
import type { ScanWorkerRequest, ScanWorkerResponse } from "../worker/protocol";
export interface ScanProgress {
completed: number;
total: number;
currentName: string;
}
export async function scanFilesInWorker(
files: readonly File[],
onProgress: (progress: ScanProgress) => void = () => undefined,
signal?: AbortSignal,
): Promise<ImageScanResult[]> {
assertBatchFiles(files);
throwIfAborted(signal);
const worker = new Worker(
new URL("../worker/scan.worker.ts", import.meta.url),
{
type: "module",
name: "privacy-metadata-scanner",
},
);
const cancel = () => worker.terminate();
signal?.addEventListener("abort", cancel, { once: true });
const results: ImageScanResult[] = [];
try {
for (let index = 0; index < files.length; index += 1) {
const file = files[index];
if (!file) continue;
throwIfAborted(signal);
onProgress({
completed: index,
total: files.length,
currentName: file.name,
});
const bytes = await file.arrayBuffer();
throwIfAborted(signal);
const requestId = `scan-${index}-${fileId(file, index)}`;
const input: ScanInput = {
id: fileId(file, index),
name: file.name,
claimedType: file.type,
size: file.size,
lastModified: file.lastModified,
bytes,
};
results.push(
await scanOne(
worker,
{ type: "scan-file", requestId, file: input },
signal,
),
);
onProgress({
completed: index + 1,
total: files.length,
currentName: file.name,
});
}
return results;
} finally {
worker.terminate();
signal?.removeEventListener("abort", cancel);
}
}
function scanOne(
worker: Worker,
request: ScanWorkerRequest,
signal?: AbortSignal,
): Promise<ImageScanResult> {
return new Promise((resolve, reject) => {
const dispose = () => {
worker.removeEventListener("message", handleMessage);
worker.removeEventListener("error", handleError);
signal?.removeEventListener("abort", handleAbort);
};
const handleMessage = (event: MessageEvent<ScanWorkerResponse>) => {
const response = event.data;
if (response.requestId !== request.requestId) return;
dispose();
if (response.type === "scanned") resolve(response.result);
else reject(new Error(response.message));
};
const handleError = (event: ErrorEvent) => {
dispose();
reject(new Error(event.message || "Metadata worker failed."));
};
const handleAbort = () => {
dispose();
reject(new DOMException("Scan cancelled", "AbortError"));
};
worker.addEventListener("message", handleMessage);
worker.addEventListener("error", handleError);
signal?.addEventListener("abort", handleAbort, { once: true });
worker.postMessage(request, [request.file.bytes]);
});
}
function fileId(file: File, index: number): string {
const safe = file.name
.toLowerCase()
.replace(/[^a-z0-9]+/gu, "-")
.replace(/^-|-$/gu, "");
return `${index + 1}-${safe || "file"}-${file.size}-${file.lastModified}`;
}
function throwIfAborted(signal?: AbortSignal): void {
if (signal?.aborted) throw new DOMException("Scan cancelled", "AbortError");
}
src/privacy/scanner.ts
+151
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import {
digestHex,
sanitizeDownloadFilename,
} from "@add-ideas/toolbox-helpers";
import { inventoryIdentity } from "./detect";
import { scanWithExifReader } from "./exif-reader-adapter";
import { FindingCollector } from "./findings";
import { scanJpeg, type FormatScan } from "./jpeg";
import { assertLimit, resolveLimits } from "./limits";
import type { ImageScanResult, PrivacyLimits, ScanInput } from "./model";
import { scanPng } from "./png";
import { scanWebp } from "./webp";
const EMPTY_FORMAT: FormatScan = Object.freeze({
animated: false,
multiImage: false,
complete: false,
blocks: [],
});
export async function scanImageBytes(
input: ScanInput,
overrides: Partial<PrivacyLimits> = {},
): Promise<ImageScanResult> {
const limits = resolveLimits(overrides);
assertLimit(input.size, limits.maxFileBytes, "File size");
if (input.bytes.byteLength !== input.size)
throw new RangeError(
`Declared file size ${input.size} does not match ${input.bytes.byteLength} bytes read`,
);
const bytes = new Uint8Array(input.bytes);
const identity = inventoryIdentity(input.name, input.claimedType, bytes);
const collector = new FindingCollector(limits);
let format: FormatScan = EMPTY_FORMAT;
if (identity.detectedKind === "jpeg")
format = scanJpeg(bytes, collector, limits);
else if (identity.detectedKind === "png")
format = scanPng(bytes, collector, limits);
else if (identity.detectedKind === "webp")
format = scanWebp(bytes, collector, limits);
const deepSupported = ["jpeg", "png", "webp"].includes(identity.detectedKind);
const secondarySupported = [
"jpeg",
"png",
"webp",
"gif",
"tiff",
"heic",
"avif",
"jxl",
].includes(identity.detectedKind);
const secondary = secondarySupported
? scanWithExifReader(input.bytes, collector, limits)
: {
status: "unsupported" as const,
notes: ["No deep metadata adapter is available for this format."],
};
const width = format.width ?? secondary.width;
const height = format.height ?? secondary.height;
let dimensionsAllowed = true;
if (width !== undefined && height !== undefined) {
if (width <= 0 || height <= 0) {
collector.warn("Image dimensions are invalid.");
dimensionsAllowed = false;
} else if (
width > limits.maxEdge ||
height > limits.maxEdge ||
width * height > limits.maxPixels
) {
collector.warn(
`Image dimensions ${width}×${height} exceed the ${limits.maxEdge}-pixel edge or ${limits.maxPixels.toLocaleString("en-US")}-pixel processing limit.`,
);
dimensionsAllowed = false;
}
} else if (deepSupported) {
collector.warn(
"Pixel dimensions could not be established from the container.",
);
dimensionsAllowed = false;
}
if (identity.typeMatch === "mismatch")
collector.warn(
"The filename or browser-claimed media type does not match the detected bytes.",
);
if (!deepSupported)
collector.warn(
"This format receives inventory and best-effort secondary inspection only; clean-copy output is unavailable.",
);
if (format.animated)
collector.warn("Animated images are inspect-only in version 0.1.");
if (format.multiImage)
collector.warn("Multi-image containers are inspect-only in version 0.1.");
const cleanable =
deepSupported &&
format.complete &&
!collector.limited &&
!format.animated &&
!format.multiImage &&
dimensionsAllowed;
const sha256 = await digestHex(bytes, "SHA-256", limits.maxFileBytes);
return {
id: input.id,
name: input.name,
safeName: sanitizeDownloadFilename(input.name, "image"),
size: input.size,
lastModified: input.lastModified,
sha256,
identity,
width,
height,
orientation: format.orientation,
animated: format.animated,
multiImage: format.multiImage,
deepSupported,
cleanable,
findings: collector.findings.sort(compareFindings),
blocks: format.blocks,
warnings: collector.warnings,
coverage: {
projectScanner: deepSupported
? format.complete && !collector.limited
? "complete"
: "partial"
: "unsupported",
secondaryScanner:
collector.limited && secondary.status === "complete"
? "partial"
: secondary.status,
notes: collector.limited
? [
...secondary.notes,
"Normalized finding output reached its text limit.",
]
: secondary.notes,
},
};
}
function compareFindings(
left: ImageScanResult["findings"][number],
right: ImageScanResult["findings"][number],
): number {
return (
left.category.localeCompare(right.category) ||
left.source.localeCompare(right.source) ||
left.label.localeCompare(right.label)
);
}
src/privacy/tiff.ts
+346
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@@ -0,0 +1,346 @@
import { categoryForName, FindingCollector } from "./findings";
import { scanIptc } from "./iptc";
import type { PrivacyLimits } from "./model";
import { scanXmp } from "./xmp";
const TYPE_BYTES: Readonly<Record<number, number>> = Object.freeze({
1: 1,
2: 1,
3: 2,
4: 4,
5: 8,
7: 1,
9: 4,
10: 8,
11: 4,
12: 8,
13: 4,
});
const TAG_NAMES: Readonly<Record<number, string>> = Object.freeze({
0x010e: "Image Description",
0x010f: "Camera Make",
0x0110: "Camera Model",
0x0112: "Orientation",
0x0131: "Software",
0x0132: "Date/Time",
0x013b: "Artist",
0x0201: "JPEG Thumbnail Offset",
0x0202: "JPEG Thumbnail Length",
0x02bc: "XMP",
0x8298: "Copyright",
0x83bb: "IPTC/NAA",
0x8769: "Exif IFD",
0x8825: "GPS IFD",
0x9003: "Date/Time Original",
0x9004: "Date/Time Digitized",
0x927c: "Maker Note",
0x9286: "User Comment",
0xa005: "Interoperability IFD",
0xa420: "Image Unique ID",
0xa430: "Camera Owner Name",
0xa431: "Camera Body Serial Number",
0xa432: "Lens Specification",
0xa433: "Lens Make",
0xa434: "Lens Model",
0xa435: "Lens Serial Number",
0x9c9b: "Windows Title",
0x9c9c: "Windows Comment",
0x9c9d: "Windows Author",
0x9c9e: "Windows Keywords",
0x9c9f: "Windows Subject",
0x8773: "ICC Profile",
});
const GPS_NAMES: Readonly<Record<number, string>> = Object.freeze({
0: "GPS Version",
1: "GPS Latitude Reference",
2: "GPS Latitude",
3: "GPS Longitude Reference",
4: "GPS Longitude",
5: "GPS Altitude Reference",
6: "GPS Altitude",
7: "GPS Time Stamp",
11: "GPS Dilution of Precision",
12: "GPS Speed Reference",
13: "GPS Speed",
16: "GPS Direction Reference",
17: "GPS Direction",
18: "GPS Map Datum",
27: "GPS Processing Method",
28: "GPS Area Information",
29: "GPS Date Stamp",
31: "GPS Horizontal Positioning Error",
});
export interface TiffScan {
orientation?: number;
complete: boolean;
}
interface IfdTask {
offset: number;
role: "main" | "exif" | "gps" | "interop" | "thumbnail";
depth: number;
}
export function scanTiff(
bytes: Uint8Array,
source: string,
baseOffset: number,
collector: FindingCollector,
limits: Readonly<PrivacyLimits>,
): TiffScan {
if (bytes.byteLength < 8) {
collector.warn(`${source} TIFF data is truncated.`);
return { complete: false };
}
const littleEndian = bytes[0] === 0x49 && bytes[1] === 0x49;
const bigEndian = bytes[0] === 0x4d && bytes[1] === 0x4d;
if (!littleEndian && !bigEndian) {
collector.warn(`${source} TIFF byte order is invalid.`);
return { complete: false };
}
const view = new DataView(bytes.buffer, bytes.byteOffset, bytes.byteLength);
const u16 = (offset: number) => view.getUint16(offset, littleEndian);
const u32 = (offset: number) => view.getUint32(offset, littleEndian);
if (u16(2) !== 42) {
collector.warn(`${source} TIFF magic is unsupported.`);
return { complete: false };
}
const tasks: IfdTask[] = [{ offset: u32(4), role: "main", depth: 0 }];
const visited = new Set<number>();
let totalEntries = 0;
let orientation: number | undefined;
let complete = true;
while (tasks.length > 0) {
const task = tasks.pop();
if (!task) break;
if (task.depth > limits.maxTiffDepth) {
collector.warn(
`${source} TIFF IFD depth exceeded ${limits.maxTiffDepth}.`,
);
complete = false;
continue;
}
if (task.offset === 0) continue;
if (visited.has(task.offset)) {
collector.warn(
`${source} TIFF IFD cycle was stopped at offset ${task.offset}.`,
);
complete = false;
continue;
}
visited.add(task.offset);
if (task.offset < 8 || task.offset + 2 > bytes.byteLength) {
collector.warn(
`${source} TIFF IFD offset is outside the metadata block.`,
);
complete = false;
continue;
}
const count = u16(task.offset);
totalEntries += count;
if (totalEntries > limits.maxTiffEntries) {
collector.warn(
`${source} TIFF entry count exceeded ${limits.maxTiffEntries}.`,
);
complete = false;
break;
}
const tableEnd = task.offset + 2 + count * 12;
if (tableEnd + 4 > bytes.byteLength) {
collector.warn(`${source} TIFF IFD entry table is truncated.`);
complete = false;
continue;
}
for (let index = 0; index < count; index += 1) {
const entryOffset = task.offset + 2 + index * 12;
const tag = u16(entryOffset);
const type = u16(entryOffset + 2);
const itemCount = u32(entryOffset + 4);
const unit = TYPE_BYTES[type];
if (!unit) continue;
const byteLength = itemCount * unit;
if (
!Number.isSafeInteger(byteLength) ||
byteLength > limits.maxMetadataBlockBytes
) {
collector.warn(
`${source} TIFF tag 0x${tag.toString(16)} is oversized.`,
);
complete = false;
continue;
}
const dataOffset =
byteLength <= 4 ? entryOffset + 8 : u32(entryOffset + 8);
if (dataOffset + byteLength > bytes.byteLength) {
collector.warn(
`${source} TIFF tag 0x${tag.toString(16)} points outside its block.`,
);
complete = false;
continue;
}
const data = bytes.subarray(dataOffset, dataOffset + byteLength);
const values = readValues(
view,
dataOffset,
itemCount,
type,
littleEndian,
);
const first = values[0];
if (tag === 0x8769 || tag === 0x8825 || tag === 0xa005) {
if (typeof first === "number") {
tasks.push({
offset: first,
role: tag === 0x8825 ? "gps" : tag === 0xa005 ? "interop" : "exif",
depth: task.depth + 1,
});
}
continue;
}
if (tag === 0x014a) {
for (const value of values)
if (typeof value === "number")
tasks.push({ offset: value, role: "main", depth: task.depth + 1 });
continue;
}
if (tag === 0x0112 && typeof first === "number") orientation = first;
if (tag === 0x02bc) {
scanXmp(data, `${source} XMP tag`, baseOffset + dataOffset, collector);
continue;
}
if (tag === 0x83bb) {
scanIptc(
data,
`${source} IPTC tag`,
baseOffset + dataOffset,
collector,
);
continue;
}
const label =
task.role === "gps"
? (GPS_NAMES[tag] ?? `GPS tag 0x${tag.toString(16)}`)
: TAG_NAMES[tag];
if (!label) continue;
const classification =
task.role === "gps"
? ({ category: "location", risk: "sensitive" } as const)
: categoryForName(label);
collector.add({
...classification,
source,
label,
value:
tag === 0x0112 && typeof first === "number"
? orientationName(first)
: displayTiffValue(data, values, type, tag),
offset: baseOffset + dataOffset,
length: byteLength,
});
}
const next = u32(tableEnd);
if (next !== 0)
tasks.push({
offset: next,
role: task.role === "main" ? "thumbnail" : task.role,
depth: task.depth + 1,
});
}
return { orientation, complete };
}
function readValues(
view: DataView,
offset: number,
count: number,
type: number,
littleEndian: boolean,
): Array<number | string> {
if (type === 2) {
const bytes = new Uint8Array(view.buffer, view.byteOffset + offset, count);
return [
stripTerminalNulls(
new TextDecoder("utf-8", { fatal: false }).decode(bytes),
),
];
}
const result: Array<number | string> = [];
const maximum = Math.min(count, 128);
for (let index = 0; index < maximum; index += 1) {
const itemOffset =
offset +
index *
(type === 3
? 2
: type === 4 || type === 9 || type === 11
? 4
: type === 5 || type === 10 || type === 12
? 8
: 1);
if (type === 1 || type === 7) result.push(view.getUint8(itemOffset));
else if (type === 3) result.push(view.getUint16(itemOffset, littleEndian));
else if (type === 4 || type === 13)
result.push(view.getUint32(itemOffset, littleEndian));
else if (type === 9) result.push(view.getInt32(itemOffset, littleEndian));
else if (type === 11)
result.push(view.getFloat32(itemOffset, littleEndian));
else if (type === 12)
result.push(view.getFloat64(itemOffset, littleEndian));
else if (type === 5 || type === 10) {
const numerator =
type === 5
? view.getUint32(itemOffset, littleEndian)
: view.getInt32(itemOffset, littleEndian);
const denominator =
type === 5
? view.getUint32(itemOffset + 4, littleEndian)
: view.getInt32(itemOffset + 4, littleEndian);
result.push(
denominator === 0 ? `${numerator}/0` : numerator / denominator,
);
}
}
if (count > maximum) result.push(`… ${count - maximum} more values`);
return result;
}
function displayTiffValue(
data: Uint8Array,
values: Array<number | string>,
type: number,
tag: number,
): string {
if (type === 2) return String(values[0] ?? "");
if (tag >= 0x9c9b && tag <= 0x9c9f && data.byteLength % 2 === 0)
return stripTerminalNulls(
new TextDecoder("utf-16le", { fatal: false }).decode(data),
);
if (tag === 0x927c || tag === 0x8773) return `${data.byteLength} bytes`;
return values.join(", ");
}
function stripTerminalNulls(value: string): string {
let end = value.length;
while (end > 0 && value.charCodeAt(end - 1) === 0) end -= 1;
return value.slice(0, end);
}
function orientationName(value: number): string {
return (
[
"Unknown",
"1 — normal",
"2 — mirrored horizontally",
"3 — rotated 180°",
"4 — mirrored vertically",
"5 — mirrored then rotated 90° clockwise",
"6 — rotated 90° clockwise",
"7 — mirrored then rotated 90° counter-clockwise",
"8 — rotated 90° counter-clockwise",
][value] ?? `${value} — invalid orientation`
);
}
src/privacy/webp.ts
+189
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@@ -0,0 +1,189 @@
import { FindingCollector } from "./findings";
import type { MetadataBlock, PrivacyLimits } from "./model";
import type { FormatScan } from "./jpeg";
import { scanTiff } from "./tiff";
import { scanXmp } from "./xmp";
export function scanWebp(
bytes: Uint8Array,
collector: FindingCollector,
limits: Readonly<PrivacyLimits>,
): FormatScan {
const blocks: MetadataBlock[] = [];
const declared = readU32le(bytes, 4) + 8;
let complete = declared === bytes.byteLength;
if (declared > bytes.byteLength || declared < 12) {
collector.warn("WebP RIFF size is invalid or truncated.");
complete = false;
} else if (declared < bytes.byteLength) {
const trailing = bytes.byteLength - declared;
blocks.push({ kind: "trailing-data", offset: declared, length: trailing });
collector.add({
category: "unknown",
risk: "sensitive",
source: "WebP",
label: "Trailing data",
value: `${trailing} bytes after the declared RIFF container`,
offset: declared,
length: trailing,
});
}
const containerEnd = Math.min(declared, bytes.byteLength);
let offset = 12;
let chunks = 0;
let width: number | undefined;
let height: number | undefined;
let orientation: number | undefined;
let animated = false;
let sawImageData = false;
while (offset + 8 <= containerEnd) {
const type = ascii(bytes, offset, 4);
const length = readU32le(bytes, offset + 4);
const dataOffset = offset + 8;
const end = dataOffset + length;
if (!/^[\x20-\x7e]{4}$/u.test(type) || end > containerEnd) {
collector.warn(`WebP chunk at byte ${offset} is malformed or truncated.`);
complete = false;
break;
}
chunks += 1;
if (chunks > limits.maxMetadataBlocks) {
collector.warn(`WebP chunk count exceeded ${limits.maxMetadataBlocks}.`);
complete = false;
break;
}
const data = bytes.subarray(dataOffset, end);
if (type === "VP8X" && data.byteLength >= 10) {
animated ||= ((data[0] ?? 0) & 0x02) !== 0;
width = 1 + readU24le(data, 4);
height = 1 + readU24le(data, 7);
} else if (type === "VP8 " && data.byteLength >= 10) {
sawImageData = true;
if (data[3] === 0x9d && data[4] === 0x01 && data[5] === 0x2a) {
width = readU16le(data, 6) & 0x3fff;
height = readU16le(data, 8) & 0x3fff;
}
} else if (type === "VP8L" && data.byteLength >= 5 && data[0] === 0x2f) {
sawImageData = true;
const bits = readU32le(data, 1);
width = 1 + (bits & 0x3fff);
height = 1 + ((bits >>> 14) & 0x3fff);
} else if (type === "ANIM" || type === "ANMF") {
animated = true;
blocks.push({ kind: type, offset: dataOffset, length });
} else if (["EXIF", "XMP ", "ICCP", "META"].includes(type)) {
if (length > limits.maxMetadataBlockBytes) {
collector.warn(`WebP ${type.trim()} metadata exceeds the block limit.`);
complete = false;
} else {
blocks.push({ kind: type.trim(), offset: dataOffset, length });
if (type === "EXIF") {
const prefix = ascii(data, 0, 6) === "Exif\u0000\u0000" ? 6 : 0;
const result = scanTiff(
data.subarray(prefix),
"WebP EXIF",
dataOffset + prefix,
collector,
limits,
);
orientation = result.orientation;
complete &&= result.complete;
} else if (type === "XMP ") {
scanXmp(data, "WebP XMP", dataOffset, collector);
} else if (type === "ICCP") {
collector.add({
category: "colour-profile",
risk: "technical",
source: "WebP ICCP",
label: "ICC profile",
value: `${length} bytes`,
offset: dataOffset,
length,
});
} else {
collector.add({
category: "unknown",
risk: "context",
source: "WebP META",
label: "Generic metadata chunk",
value: `${length} bytes`,
offset: dataOffset,
length,
});
}
}
} else if (type === "ALPH") {
// Pixel alpha data, not metadata.
} else if (!["VP8X", "VP8 ", "VP8L", "ANIM", "ANMF"].includes(type)) {
const lower = ascii(
data,
0,
Math.min(data.byteLength, 4096),
).toLowerCase();
const provenance = lower.includes("c2pa") || lower.includes("jumb");
blocks.push({
kind: type.trim() || "unknown",
offset: dataOffset,
length,
});
collector.add({
category: provenance ? "provenance" : "unknown",
risk: "context",
source: "WebP",
label: provenance
? "Unrecognized provenance chunk"
: `Unrecognized ${type} chunk`,
value: `${length} bytes`,
offset: dataOffset,
length,
});
}
offset = end + (length % 2);
}
if (offset !== containerEnd) {
collector.warn("WebP chunk padding or RIFF boundary is inconsistent.");
complete = false;
}
if (!sawImageData && !animated) {
collector.warn("WebP pixel data was not found.");
complete = false;
}
return {
width,
height,
orientation,
animated,
multiImage: false,
complete,
blocks,
};
}
function ascii(bytes: Uint8Array, offset: number, length: number): string {
if (offset < 0 || offset + length > bytes.byteLength) return "";
let value = "";
for (let index = 0; index < length; index += 1)
value += String.fromCharCode(bytes[offset + index] ?? 0);
return value;
}
function readU16le(bytes: Uint8Array, offset: number): number {
return (bytes[offset] ?? 0) | ((bytes[offset + 1] ?? 0) << 8);
}
function readU24le(bytes: Uint8Array, offset: number): number {
return (
(bytes[offset] ?? 0) |
((bytes[offset + 1] ?? 0) << 8) |
((bytes[offset + 2] ?? 0) << 16)
);
}
function readU32le(bytes: Uint8Array, offset: number): number {
return (
(bytes[offset] ?? 0) +
(bytes[offset + 1] ?? 0) * 0x100 +
(bytes[offset + 2] ?? 0) * 0x10000 +
(bytes[offset + 3] ?? 0) * 0x1000000
);
}
src/privacy/xmp.ts
+94
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import { categoryForName, FindingCollector } from "./findings";
const NAMED_VALUES =
/(?:<|\s)([A-Za-z_][\w.-]*:[A-Za-z_][\w.-]*)(?:\s*=\s*["']([^"']*)["']|[^>]*>([^<]{1,65536})<)/gu;
export function scanXmp(
input: Uint8Array | string,
source: string,
offset: number | undefined,
collector: FindingCollector,
): void {
const raw = typeof input === "string" ? input : decodeMetadataText(input);
if (!raw.trim()) return;
let matched = 0;
for (const match of raw.matchAll(NAMED_VALUES)) {
const name = match[1] ?? "XMP value";
const value = decodeXmlEntities(match[2] ?? match[3] ?? "");
if (!value.trim()) continue;
const classification = categoryForName(name);
if (
classification.category !== "unknown" ||
/(?:xmp|rdf|dc|exif|photoshop|tiff):/iu.test(name)
) {
collector.add({
...classification,
source,
label: name,
value,
offset,
length: typeof input === "string" ? input.length : input.byteLength,
});
matched += 1;
}
}
for (const token of ["c2pa", "jumbf", "provenance", "manifest"]) {
if (raw.toLowerCase().includes(token)) {
collector.add({
category: "provenance",
risk: "context",
source,
label: "Provenance marker",
value: token.toUpperCase(),
offset,
length: typeof input === "string" ? input.length : input.byteLength,
});
}
}
collector.add({
category: matched > 0 ? "technical" : "unknown",
risk: matched > 0 ? "technical" : "context",
source,
label: "Raw XMP packet",
value: raw,
offset,
length: typeof input === "string" ? input.length : input.byteLength,
});
}
export function decodeMetadataText(bytes: Uint8Array): string {
if (bytes.byteLength >= 2 && bytes[0] === 0xff && bytes[1] === 0xfe)
return new TextDecoder("utf-16le", { fatal: false }).decode(
bytes.subarray(2),
);
if (bytes.byteLength >= 2 && bytes[0] === 0xfe && bytes[1] === 0xff)
return new TextDecoder("utf-16be", { fatal: false }).decode(
bytes.subarray(2),
);
return new TextDecoder("utf-8", { fatal: false }).decode(bytes);
}
function decodeXmlEntities(value: string): string {
return value.replace(
/&(?:amp|lt|gt|quot|apos|#\d+|#x[\da-f]+);/giu,
(entity) => {
if (entity === "&amp;") return "&";
if (entity === "&lt;") return "<";
if (entity === "&gt;") return ">";
if (entity === "&quot;") return '"';
if (entity === "&apos;") return "'";
const hex = /^&#x([\da-f]+);$/iu.exec(entity);
const decimal = /^&#(\d+);$/u.exec(entity);
const codePoint = hex
? Number.parseInt(hex[1] ?? "", 16)
: decimal
? Number.parseInt(decimal[1] ?? "", 10)
: Number.NaN;
return Number.isInteger(codePoint) &&
codePoint >= 0 &&
codePoint <= 0x10ffff
? String.fromCodePoint(codePoint)
: entity;
},
);
}
src/styles.css
+757
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@@ -0,0 +1,757 @@
:root {
--privacy-purple: #5946bc;
--privacy-teal: #147d72;
--privacy-warning: #9a5a08;
--privacy-success: #147057;
--toolbox-background: #f6f7fb;
--toolbox-surface: #ffffff;
--toolbox-surface-soft: #eff1f7;
--toolbox-text: #202332;
--toolbox-muted: #656b7d;
--toolbox-border: #d9dce7;
--toolbox-accent: var(--privacy-purple);
--toolbox-accent-hover: #493caf;
--toolbox-accent-soft: #ece9ff;
--toolbox-accent-contrast: #ffffff;
--toolbox-focus: var(--privacy-teal);
--toolbox-danger: #b42342;
}
* {
box-sizing: border-box;
}
html {
min-width: 20rem;
min-height: 100%;
background: var(--toolbox-background);
scrollbar-gutter: stable;
}
body {
min-width: 20rem;
min-height: 100vh;
margin: 0;
background: var(--toolbox-background);
color: var(--toolbox-text);
font-family:
Inter,
ui-sans-serif,
system-ui,
-apple-system,
BlinkMacSystemFont,
"Segoe UI",
sans-serif;
text-rendering: optimizeLegibility;
-webkit-font-smoothing: antialiased;
}
#root {
min-height: 100vh;
}
::selection {
background: color-mix(in srgb, var(--toolbox-focus) 36%, transparent);
}
.toolbox-shell__main {
width: min(100%, 90rem);
padding: clamp(0.75rem, 1.8vw, 1.5rem);
}
:where(button, input, select, textarea) {
font: inherit;
}
:where(button, .button) {
min-height: 2.55rem;
display: inline-flex;
align-items: center;
justify-content: center;
gap: 0.4rem;
padding: 0.55rem 0.8rem;
border: 1px solid var(--toolbox-border);
border-radius: 0.65rem;
background: var(--toolbox-surface);
color: var(--toolbox-text);
font-size: 0.8rem;
font-weight: 720;
line-height: 1.2;
cursor: pointer;
touch-action: manipulation;
transition:
border-color 140ms ease,
background-color 140ms ease,
transform 140ms ease;
}
button:hover:not(:disabled),
.button:hover {
border-color: var(--toolbox-accent);
background: var(--toolbox-surface-soft);
}
button:active:not(:disabled) {
transform: translateY(1px);
}
button:disabled {
cursor: not-allowed;
opacity: 0.48;
}
:where(button, input, select, textarea, summary, a):focus-visible {
outline: 3px solid color-mix(in srgb, var(--toolbox-focus) 42%, transparent);
outline-offset: 2px;
}
.primary-button {
border-color: var(--toolbox-accent);
background: var(--toolbox-accent);
color: var(--toolbox-accent-contrast);
}
.primary-button:hover:not(:disabled) {
background: var(--toolbox-accent-hover);
}
.sr-only {
position: absolute !important;
width: 1px !important;
height: 1px !important;
padding: 0 !important;
margin: -1px !important;
overflow: hidden !important;
clip: rect(0, 0, 0, 0) !important;
white-space: nowrap !important;
border: 0 !important;
}
.workbench {
display: grid;
gap: 1rem;
}
.hero,
.panel,
.boundary-note {
border: 1px solid var(--toolbox-border);
border-radius: 0.9rem;
background: var(--toolbox-surface);
box-shadow:
0 1px 2px rgb(24 30 60 / 4%),
0 9px 28px rgb(24 30 60 / 3%);
}
.hero {
display: flex;
justify-content: space-between;
gap: 1rem;
align-items: flex-start;
padding: clamp(1.1rem, 3vw, 2rem);
background:
radial-gradient(
circle at 88% 20%,
color-mix(in srgb, var(--toolbox-focus) 12%, transparent),
transparent 33%
),
var(--toolbox-surface);
}
:where(.hero, .panel, .help-dialog, .fatal) :where(h1, h2, h3) {
margin: 0;
color: var(--toolbox-text);
font-weight: 760;
letter-spacing: -0.025em;
line-height: 1.17;
}
.hero h1 {
font-size: clamp(1.7rem, 3vw, 2.5rem);
}
.panel h2,
.help-dialog h2 {
font-size: clamp(1.25rem, 2vw, 1.65rem);
}
.panel h3,
.help-dialog h3 {
font-size: 1rem;
}
.hero p:not(.eyebrow) {
max-width: 58rem;
margin: 0.55rem 0 0;
color: var(--toolbox-muted);
line-height: 1.55;
}
.eyebrow {
margin: 0 0 0.3rem;
color: var(--toolbox-accent);
font-size: 0.69rem;
font-weight: 820;
letter-spacing: 0.115em;
text-transform: uppercase;
}
.privacy-pill,
.status-badge {
flex: 0 0 auto;
display: inline-flex;
align-items: center;
width: max-content;
padding: 0.38rem 0.62rem;
border: 1px solid color-mix(in srgb, var(--toolbox-accent) 25%, transparent);
border-radius: 999px;
background: var(--toolbox-accent-soft);
color: var(--toolbox-accent);
font-size: 0.7rem;
font-weight: 760;
line-height: 1.15;
text-transform: capitalize;
}
.panel {
min-width: 0;
padding: clamp(0.85rem, 2vw, 1.15rem);
}
.panel-heading,
.file-card-heading,
.verification-heading {
display: flex;
justify-content: space-between;
gap: 1rem;
align-items: flex-start;
}
.panel-heading {
margin-bottom: 0.9rem;
}
.action-heading {
align-items: flex-end;
}
.muted {
margin: 0.35rem 0 0;
color: var(--toolbox-muted);
font-size: 0.82rem;
line-height: 1.5;
}
.limit-note {
color: var(--toolbox-muted);
font-size: 0.72rem;
white-space: nowrap;
}
.drop-zone {
width: 100%;
min-height: 10rem;
flex-direction: column;
padding: 1.25rem;
border: 1.5px dashed
color-mix(in srgb, var(--toolbox-accent) 45%, var(--toolbox-border));
background: color-mix(
in srgb,
var(--toolbox-accent-soft) 54%,
var(--toolbox-surface)
);
text-align: center;
}
.drop-zone > strong {
font-size: 1rem;
}
.drop-zone > span:last-child {
max-width: 42rem;
color: var(--toolbox-muted);
font-size: 0.76rem;
font-weight: 520;
line-height: 1.5;
}
.drop-zone.is-dragging {
border-style: solid;
border-color: var(--toolbox-focus);
background: color-mix(
in srgb,
var(--toolbox-focus) 12%,
var(--toolbox-surface)
);
}
.drop-icon {
width: 2.6rem;
height: 2.6rem;
display: grid;
place-items: center;
border-radius: 50%;
background: var(--toolbox-accent);
color: var(--toolbox-accent-contrast) !important;
font-size: 1.2rem !important;
}
.progress {
display: grid;
gap: 0.4rem;
margin-top: 0.8rem;
color: var(--toolbox-muted);
font-size: 0.75rem;
}
.progress progress {
width: 100%;
height: 0.55rem;
accent-color: var(--toolbox-accent);
}
.button-row {
display: flex;
align-items: center;
justify-content: flex-end;
flex-wrap: wrap;
gap: 0.5rem;
}
.inventory-table-wrap {
overflow: auto;
border: 1px solid var(--toolbox-border);
border-radius: 0.72rem;
}
.inventory-table {
width: 100%;
min-width: 52rem;
border-collapse: collapse;
font-size: 0.77rem;
}
.inventory-table :where(th, td) {
padding: 0.65rem 0.72rem;
border-bottom: 1px solid var(--toolbox-border);
text-align: left;
vertical-align: middle;
}
.inventory-table th {
position: sticky;
z-index: 1;
top: 0;
background: var(--toolbox-surface-soft);
color: var(--toolbox-muted);
font-size: 0.68rem;
letter-spacing: 0.04em;
text-transform: uppercase;
}
.inventory-table tbody tr:last-child td {
border-bottom: 0;
}
.inventory-table td {
max-width: 20rem;
}
.inventory-table td > :where(strong, span, code) {
display: block;
overflow-wrap: anywhere;
}
.inventory-table td > span:not(.status-badge) {
margin-top: 0.25rem;
color: var(--toolbox-muted);
font-size: 0.68rem;
}
.inventory-table .status-badge {
margin-top: 0.28rem;
}
.status-badge.is-mismatch,
.status-badge.is-failed {
border-color: color-mix(in srgb, var(--toolbox-danger) 35%, transparent);
background: color-mix(
in srgb,
var(--toolbox-danger) 10%,
var(--toolbox-surface)
);
color: var(--toolbox-danger);
}
.status-badge.is-warning,
.status-badge.is-unknown,
.status-badge.is-unclaimed {
border-color: color-mix(in srgb, var(--privacy-warning) 35%, transparent);
background: color-mix(
in srgb,
var(--privacy-warning) 10%,
var(--toolbox-surface)
);
color: var(--privacy-warning);
}
.status-badge.is-verified,
.status-badge.is-match {
border-color: color-mix(in srgb, var(--privacy-success) 35%, transparent);
background: color-mix(
in srgb,
var(--privacy-success) 10%,
var(--toolbox-surface)
);
color: var(--privacy-success);
}
.file-results {
display: grid;
gap: 1rem;
}
.file-card {
display: grid;
gap: 0.85rem;
}
.file-card-heading {
align-items: center;
}
.hash-line {
max-width: 70rem;
overflow-wrap: anywhere;
}
.hash-line code,
.finding-list code,
.verification-grid code {
font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
font-size: 0.74rem;
}
.warning-list,
.error-message,
.boundary-note {
margin: 0;
padding: 0.72rem 0.86rem;
border-radius: 0.68rem;
font-size: 0.78rem;
line-height: 1.5;
}
.warning-list {
padding-left: 2rem;
border: 1px solid
color-mix(in srgb, var(--privacy-warning) 32%, var(--toolbox-border));
background: color-mix(
in srgb,
var(--privacy-warning) 7%,
var(--toolbox-surface)
);
color: color-mix(in srgb, var(--privacy-warning) 82%, var(--toolbox-text));
}
.error-message {
border: 1px solid
color-mix(in srgb, var(--toolbox-danger) 32%, var(--toolbox-border));
background: color-mix(
in srgb,
var(--toolbox-danger) 7%,
var(--toolbox-surface)
);
color: var(--toolbox-danger);
}
.finding-summary {
display: grid;
gap: 0.45rem;
}
.finding-summary > p {
margin: 0;
color: var(--toolbox-muted);
font-size: 0.8rem;
}
.finding-summary details,
.verification details {
overflow: hidden;
border: 1px solid var(--toolbox-border);
border-radius: 0.65rem;
background: var(--toolbox-surface);
}
.finding-summary summary,
.verification summary {
display: flex;
justify-content: space-between;
gap: 0.7rem;
padding: 0.62rem 0.72rem;
background: var(--toolbox-surface-soft);
font-size: 0.77rem;
font-weight: 730;
cursor: pointer;
}
.finding-list {
display: grid;
}
.finding-list > div {
min-width: 0;
display: grid;
grid-template-columns: minmax(9rem, 0.32fr) minmax(0, 1fr);
gap: 0.8rem;
padding: 0.62rem 0.72rem;
}
.finding-list > div + div {
border-top: 1px solid var(--toolbox-border);
}
.finding-list > div > div {
display: grid;
align-content: start;
gap: 0.2rem;
}
.finding-list strong {
font-size: 0.75rem;
}
.finding-list span {
color: var(--toolbox-muted);
font-size: 0.66rem;
}
.finding-list code {
overflow: auto;
max-height: 12rem;
padding: 0.45rem;
border-radius: 0.4rem;
background: var(--toolbox-surface-soft);
color: var(--toolbox-text);
overflow-wrap: anywhere;
white-space: pre-wrap;
}
.finding-list .omitted-findings {
margin: 0;
padding: 0.55rem 0.72rem;
border-top: 1px solid var(--toolbox-border);
color: var(--toolbox-muted);
font-size: 0.72rem;
}
.verification {
display: grid;
gap: 0.8rem;
padding: 0.9rem;
border: 1px solid
color-mix(in srgb, var(--privacy-success) 30%, var(--toolbox-border));
border-radius: 0.75rem;
background: color-mix(
in srgb,
var(--privacy-success) 5%,
var(--toolbox-surface)
);
}
.verification.is-warning {
border-color: color-mix(
in srgb,
var(--privacy-warning) 35%,
var(--toolbox-border)
);
background: color-mix(
in srgb,
var(--privacy-warning) 5%,
var(--toolbox-surface)
);
}
.verification.is-failed {
border-color: color-mix(
in srgb,
var(--toolbox-danger) 35%,
var(--toolbox-border)
);
background: color-mix(
in srgb,
var(--toolbox-danger) 5%,
var(--toolbox-surface)
);
}
.verification-grid {
display: grid;
grid-template-columns: repeat(4, minmax(0, 1fr));
gap: 0.65rem;
margin: 0;
}
.verification-grid > div {
min-width: 0;
padding: 0.62rem;
border: 1px solid var(--toolbox-border);
border-radius: 0.58rem;
background: var(--toolbox-surface);
}
.verification-grid dt {
color: var(--toolbox-muted);
font-size: 0.67rem;
font-weight: 720;
}
.verification-grid dd {
margin: 0.3rem 0 0;
overflow-wrap: anywhere;
font-size: 0.75rem;
}
.verification details ul {
margin: 0;
padding: 0.7rem 0.7rem 0.7rem 2rem;
font-size: 0.76rem;
}
.disclaimer {
margin: 0;
color: var(--toolbox-muted);
font-size: 0.73rem;
line-height: 1.5;
}
.boundary-note {
border-color: color-mix(
in srgb,
var(--privacy-warning) 30%,
var(--toolbox-border)
);
background: color-mix(
in srgb,
var(--privacy-warning) 6%,
var(--toolbox-surface)
);
}
.help-dialog {
width: min(48rem, calc(100% - 2rem));
max-height: calc(100vh - 2rem);
padding: clamp(1rem, 2.5vw, 1.4rem);
overflow: auto;
border: 1px solid var(--toolbox-border);
border-radius: 0.9rem;
background: var(--toolbox-surface);
color: var(--toolbox-text);
box-shadow: 0 24px 80px rgb(10 16 38 / 28%);
}
.help-dialog::backdrop {
background: rgb(20 24 45 / 55%);
backdrop-filter: blur(2px);
}
.dialog-heading {
display: flex;
justify-content: space-between;
gap: 1rem;
align-items: flex-start;
margin-bottom: 0.85rem;
}
.dialog-heading button {
width: 2.55rem;
min-width: 2.55rem;
padding: 0;
}
.help-sections {
display: grid;
grid-template-columns: repeat(2, minmax(0, 1fr));
gap: 0.75rem;
}
.help-sections section {
display: grid;
align-content: start;
gap: 0.45rem;
padding: 0.85rem;
border: 1px solid var(--toolbox-border);
border-radius: 0.68rem;
background: var(--toolbox-surface-soft);
}
.help-sections p {
margin: 0;
color: var(--toolbox-muted);
font-size: 0.8rem;
line-height: 1.55;
}
.loading,
.fatal {
width: min(100% - 2rem, 60rem);
margin: 2rem auto;
padding: 1rem;
}
@media (max-width: 64rem) {
.verification-grid {
grid-template-columns: repeat(2, minmax(0, 1fr));
}
}
@media (max-width: 48rem) {
.hero,
.panel-heading,
.file-card-heading,
.verification-heading {
flex-direction: column;
}
.privacy-pill {
order: -1;
}
.action-heading {
align-items: stretch;
}
.button-row {
justify-content: flex-start;
}
.finding-list > div,
.help-sections {
grid-template-columns: 1fr;
}
}
@media (max-width: 32rem) {
.toolbox-shell__main {
padding: 0.65rem;
}
.button-row > button {
width: 100%;
}
.verification-grid {
grid-template-columns: 1fr;
}
}
@media (prefers-reduced-motion: reduce) {
*,
*::before,
*::after {
transition-duration: 0.01ms !important;
animation-duration: 0.01ms !important;
animation-iteration-count: 1 !important;
}
}
src/test/setup.ts
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import "@testing-library/jest-dom/vitest";
import { afterEach } from "vitest";
import { cleanup } from "@testing-library/react";
afterEach(() => {
cleanup();
globalThis.localStorage?.clear();
});
src/toolbox/manifest.source.json
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{
"$schema": "https://git.add-ideas.de/lotobo/toolbox-sdk/raw/branch/main/schemas/toolbox-app.v1.schema.json",
"schemaVersion": 1,
"id": "de.add-ideas.privacy-tools",
"name": "Privacy Tools",
"version": "0.1.0",
"description": "Inspect and remove shareable-file metadata locally in the browser.",
"entry": "./",
"icon": "./favicon.svg",
"categories": ["privacy", "files", "security"],
"tags": ["metadata", "exif", "privacy", "sanitize", "share"],
"integration": {
"contextVersion": 1,
"launchModes": ["navigate", "new-tab"],
"embedding": "unsupported"
},
"requirements": {
"secureContext": true,
"workers": true,
"indexedDb": false,
"crossOriginIsolated": false,
"topLevelContext": false
},
"privacy": {
"processing": "local",
"fileUploads": true,
"telemetry": false,
"label": "Inputs stay in this browser; nothing is uploaded."
},
"source": {
"repository": "https://git.add-ideas.de/lotobo/privacy-tools",
"license": "GPL-3.0-or-later"
},
"actions": [
{
"id": "source",
"label": "Source",
"url": "https://git.add-ideas.de/lotobo/privacy-tools"
}
]
}
src/toolbox/manifest.ts
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import { defineToolboxApp, parseToolboxApp } from "@add-ideas/toolbox-contract";
import source from "./manifest.source.json";
export const manifest = defineToolboxApp(parseToolboxApp(source));
src/version.ts
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export const APP_VERSION = "0.1.0";
src/vite-env.d.ts
Vendored
+1
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/// <reference types="vite/client" />
src/worker/protocol.ts
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import type { ImageScanResult, ScanInput } from "../privacy/model";
export interface ScanFileRequest {
type: "scan-file";
requestId: string;
file: ScanInput;
}
export type ScanWorkerRequest = ScanFileRequest;
export type ScanWorkerResponse =
| {
type: "scanned";
requestId: string;
result: ImageScanResult;
}
| {
type: "error";
requestId: string;
message: string;
};
src/worker/scan.worker.ts
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/// <reference lib="webworker" />
import { scanImageBytes } from "../privacy/scanner";
import type { ScanWorkerRequest, ScanWorkerResponse } from "./protocol";
const scope = self as DedicatedWorkerGlobalScope;
scope.addEventListener("message", (event: MessageEvent<ScanWorkerRequest>) => {
if (event.data.type === "scan-file") void scanFile(event.data);
});
async function scanFile(request: ScanWorkerRequest): Promise<void> {
try {
post({
type: "scanned",
requestId: request.requestId,
result: await scanImageBytes(request.file),
});
} catch (error) {
post({
type: "error",
requestId: request.requestId,
message:
error instanceof Error ? error.message : "Metadata scanning failed.",
});
}
}
function post(message: ScanWorkerResponse): void {
scope.postMessage(message);
}
tests/browser/app.spec.ts
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import { expect, test, type Page } from "@playwright/test";
import { pngFixture, tiffFixture } from "../fixtures/images";
const ORIGIN = "http://127.0.0.1:4173";
async function localOnly(page: Page) {
const external: string[] = [];
await page.route("**/*", async (route) => {
const url = new URL(route.request().url());
if (url.origin !== ORIGIN) {
external.push(url.href);
await route.abort();
} else await route.continue();
});
return external;
}
test("runs from a nested path without external requests", async ({ page }) => {
const errors: string[] = [];
page.on("pageerror", (error) => errors.push(error.message));
page.on("console", (message) => {
if (message.type() === "error") errors.push(message.text());
});
const external = await localOnly(page);
await page.goto("/deep/nested/privacy/");
await expect(
page.getByRole("heading", { name: "Privacy Tools" }),
).toBeVisible();
expect(external).toEqual([]);
expect(errors).toEqual([]);
});
test("serves the release identity and hardened headers", async ({
request,
}) => {
const index = await request.get("/deep/nested/privacy/");
expect(index.ok()).toBe(true);
expect(index.headers()["content-security-policy"]).toContain(
"default-src 'self'",
);
expect(await index.text()).not.toMatch(/\b(?:src|href)=["']\//u);
const manifest = await request.get("/deep/nested/privacy/toolbox-app.json");
await expect(manifest.json()).resolves.toMatchObject({
id: "de.add-ideas.privacy-tools",
version: "0.1.0",
entry: "./",
});
});
test("inspects and independently verifies a re-encoded PNG without network access", async ({
page,
}) => {
const errors: string[] = [];
page.on("pageerror", (error) => errors.push(error.message));
page.on("console", (message) => {
if (message.type() === "error") errors.push(message.text());
});
const external = await localOnly(page);
await page.goto("/deep/nested/privacy/");
await page.locator('input[type="file"]').setInputFiles([
{
name: "metadata-fixture.png",
mimeType: "image/png",
buffer: Buffer.from(pngFixture()),
},
{
name: "inventory-only.pdf",
mimeType: "application/pdf",
buffer: Buffer.from("%PDF-1.7\n% fixture"),
},
]);
await expect(
page.getByRole("heading", { name: "Batch inventory" }),
).toBeVisible();
await expect(page.getByText("Alice PNG").first()).toBeVisible();
await expect(page.getByText("PNG Alice").first()).toBeVisible();
await expect(page.getByText("inventory-only.pdf").first()).toBeVisible();
await page.getByRole("button", { name: "Re-encode & verify" }).click();
await expect(page.getByText("Mandatory output re-scan")).toBeVisible();
await expect(page.locator(".verification")).not.toHaveClass(/is-failed/u);
await expect(
page.getByRole("button", { name: "Download re-encoded output" }),
).toBeEnabled();
const imageDownload = page.waitForEvent("download");
await page
.getByRole("button", { name: "Download re-encoded output" })
.click();
expect((await imageDownload).suggestedFilename()).toBe(
"metadata-fixture.clean.png",
);
const reportDownload = page.waitForEvent("download");
await page.getByRole("button", { name: "Download JSON report" }).click();
expect((await reportDownload).suggestedFilename()).toBe(
"privacy-tools-report.json",
);
const archiveDownload = page.waitForEvent("download");
await page
.getByRole("button", { name: "Download 1 re-encoded image + report" })
.click();
expect((await archiveDownload).suggestedFilename()).toBe(
"privacy-tools-re-encoded-images.zip",
);
expect(external).toEqual([]);
expect(errors).toEqual([]);
});
test("normalizes EXIF orientation while re-encoding JPEG pixels", async ({
page,
}) => {
const external = await localOnly(page);
await page.goto("/deep/nested/privacy/");
const encoded = await page.evaluate(async () => {
const canvas = document.createElement("canvas");
canvas.width = 2;
canvas.height = 1;
const context = canvas.getContext("2d");
if (!context) throw new Error("Missing test canvas");
context.fillStyle = "#ff0000";
context.fillRect(0, 0, 1, 1);
context.fillStyle = "#0000ff";
context.fillRect(1, 0, 1, 1);
const blob = await new Promise<Blob>((resolve, reject) =>
canvas.toBlob(
(value) =>
value ? resolve(value) : reject(new Error("JPEG encode failed")),
"image/jpeg",
0.95,
),
);
return [...new Uint8Array(await blob.arrayBuffer())];
});
const jpeg = addExifOrientation(Buffer.from(encoded), 6);
await page.locator('input[type="file"]').setInputFiles({
name: "oriented.jpg",
mimeType: "image/jpeg",
buffer: jpeg,
});
await expect(page.getByText("2 × 1 pixels")).toBeVisible();
await page.getByRole("button", { name: "Re-encode & verify" }).click();
await expect(page.getByText("Mandatory output re-scan")).toBeVisible();
await expect(page.locator(".verification")).not.toHaveClass(/is-failed/u);
await expect(page.getByText("Normalized", { exact: true })).toBeVisible();
expect(external).toEqual([]);
});
function addExifOrientation(jpeg: Buffer, orientation: number): Buffer {
const payload = Buffer.concat([
Buffer.from("Exif\0\0", "binary"),
Buffer.from(tiffFixture({ orientation })),
]);
const segment = Buffer.from([
0xff,
0xe1,
((payload.length + 2) >>> 8) & 0xff,
(payload.length + 2) & 0xff,
]);
return Buffer.concat([
jpeg.subarray(0, 2),
segment,
payload,
jpeg.subarray(2),
]);
}
tests/components/app.test.tsx
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import { render, screen } from "@testing-library/react";
import { describe, expect, it, vi } from "vitest";
import { App } from "../../src/App";
describe("Privacy Tools", () => {
it("renders the local workbench and standard shell", async () => {
vi.stubGlobal(
"fetch",
vi.fn(async () => new Response("Not found", { status: 404 })),
);
render(<App />);
expect(
await screen.findByRole("heading", { name: "Privacy Tools" }),
).toBeVisible();
expect(await screen.findByText("Local & ephemeral")).toBeVisible();
expect(screen.getAllByText(/No anonymity promise/iu)).not.toHaveLength(0);
});
});
tests/fixtures/images.ts
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import { crc32 } from "@add-ideas/toolbox-helpers";
import { zlibSync } from "fflate";
const encoder = new TextEncoder();
export function jpegFixture(options: { trailing?: boolean } = {}): Uint8Array {
const xmp = encoder.encode(
"http://ns.adobe.com/xap/1.0/\0" +
'<?xpacket begin=""><x:xmpmeta xmlns:x="adobe:ns:meta/" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:exif="http://ns.adobe.com/exif/1.0/" xmlns:xmp="http://ns.adobe.com/xap/1.0/" xmlns:xmpMM="http://ns.adobe.com/xap/1.0/mm/"><rdf:RDF><rdf:Description><dc:creator>Alice Example</dc:creator><exif:GPSLatitude>48.1 N</exif:GPSLatitude><xmp:CreatorTool>Fixture Camera</xmp:CreatorTool><xmpMM:DocumentID>doc-123</xmpMM:DocumentID></rdf:Description></rdf:RDF></x:xmpmeta><?xpacket end="w"?>',
);
const jfif = concat(
encoder.encode("JFIF\0"),
bytes(1, 2, 0),
u16be(72),
u16be(72),
bytes(0, 0),
);
const iptc = concat(
iptcDataset(80, "Alice Reporter"),
iptcDataset(90, "Berlin"),
iptcDataset(120, "Private caption"),
);
const photoshop = concat(
encoder.encode("Photoshop 3.0\0"),
encoder.encode("8BIM"),
u16be(0x0404),
bytes(0, 0),
u32be(iptc.byteLength),
iptc,
iptc.byteLength % 2 ? bytes(0) : bytes(),
);
const body = concat(
bytes(0xff, 0xd8),
jpegSegment(0xe0, jfif),
jpegSegment(0xe1, concat(encoder.encode("Exif\0\0"), tiffFixture())),
jpegSegment(0xe1, xmp),
jpegSegment(
0xe2,
concat(
encoder.encode("ICC_PROFILE\0"),
bytes(1, 1),
encoder.encode("icc"),
),
),
jpegSegment(0xeb, encoder.encode("jumb/c2pa test manifest")),
jpegSegment(0xed, photoshop),
jpegSegment(0xfe, encoder.encode("private jpeg comment")),
jpegSegment(0xc0, bytes(8, 0, 2, 0, 3, 1, 1, 0x11, 0)),
bytes(0xff, 0xda, 0xff, 0xd9),
);
return options.trailing ? concat(body, encoder.encode("hidden")) : body;
}
export function pngFixture(
options: {
cycleTiff?: boolean;
inflatedCommentBytes?: number;
animated?: boolean;
trailing?: boolean;
} = {},
): Uint8Array {
const width = 2;
const height = 1;
const ihdr = concat(u32be(width), u32be(height), bytes(8, 6, 0, 0, 0));
const xmp = encoder.encode(
"XML:com.adobe.xmp\0\0\0\0\0" +
'<rdf:Description xmlns:rdf="urn:rdf"><dc:creator xmlns:dc="urn:dc">PNG Alice</dc:creator><xmp:CreatorTool xmlns:xmp="urn:xmp">PNG Fixture</xmp:CreatorTool></rdf:Description>',
);
const inflated = encoder.encode(
"x".repeat(options.inflatedCommentBytes ?? 32),
);
const scanline = bytes(0, 255, 0, 0, 255, 0, 0, 255, 255);
const chunks = [
pngChunk("IHDR", ihdr),
pngChunk("tEXt", encoder.encode("Author\0Alice PNG")),
pngChunk(
"zTXt",
concat(encoder.encode("Comment\0"), bytes(0), zlibSync(inflated)),
),
pngChunk("iTXt", xmp),
pngChunk("eXIf", tiffFixture({ cycle: options.cycleTiff })),
pngChunk(
"iCCP",
concat(
encoder.encode("fixture profile\0"),
bytes(0),
zlibSync(encoder.encode("ICC profile bytes")),
),
),
pngChunk("vpAg", encoder.encode("private ancillary data")),
...(options.animated ? [pngChunk("acTL", concat(u32be(2), u32be(0)))] : []),
pngChunk("IDAT", zlibSync(scanline)),
pngChunk("IEND", bytes()),
];
const image = concat(
bytes(0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a),
...chunks,
);
return options.trailing
? concat(image, encoder.encode("trailing secret"))
: image;
}
export function webpFixture(options: { animated?: boolean } = {}): Uint8Array {
const vp8x = bytes(options.animated ? 0x02 : 0, 0, 0, 0, 3, 0, 0, 2, 0, 0);
const dimensions = 3 | (2 << 14);
const vp8l = concat(bytes(0x2f), u32le(dimensions));
const xmp = encoder.encode(
'<rdf:Description xmlns:rdf="urn:rdf"><dc:creator xmlns:dc="urn:dc">WebP Alice</dc:creator><exif:GPSLongitude xmlns:exif="urn:exif">13.4 E</exif:GPSLongitude></rdf:Description>',
);
const chunks = concat(
riffChunk("VP8X", vp8x),
riffChunk("VP8L", vp8l),
riffChunk("EXIF", concat(encoder.encode("Exif\0\0"), tiffFixture())),
riffChunk("XMP ", xmp),
riffChunk("ICCP", encoder.encode("ICC profile bytes")),
...(options.animated ? [riffChunk("ANIM", bytes(0, 0, 0, 0, 0, 0))] : []),
);
return concat(
encoder.encode("RIFF"),
u32le(chunks.byteLength + 4),
encoder.encode("WEBP"),
chunks,
);
}
export function tiffFixture(
options: { cycle?: boolean; orientation?: number } = {},
): Uint8Array {
const make = encoder.encode("CameraCo\0");
const date = encoder.encode("2026:09:01 12:34:56\0");
const gpsDate = encoder.encode("2026:09:01\0");
const mainOffset = 8;
const mainEntries = 4;
const mainEnd = mainOffset + 2 + mainEntries * 12;
const dataStart = mainEnd + 4;
const makeOffset = dataStart;
const dateOffset = makeOffset + make.byteLength;
const gpsOffset = dateOffset + date.byteLength;
const gpsEntries = 2;
const gpsEnd = gpsOffset + 2 + gpsEntries * 12;
const gpsDateOffset = gpsEnd + 4;
const result = new Uint8Array(gpsDateOffset + gpsDate.byteLength);
const view = new DataView(result.buffer);
result.set(bytes(0x49, 0x49), 0);
view.setUint16(2, 42, true);
view.setUint32(4, mainOffset, true);
view.setUint16(mainOffset, mainEntries, true);
writeIfdEntry(view, mainOffset + 2, 0x010f, 2, make.byteLength, makeOffset);
writeIfdEntry(view, mainOffset + 14, 0x0112, 3, 1, options.orientation ?? 1);
writeIfdEntry(view, mainOffset + 26, 0x0132, 2, date.byteLength, dateOffset);
writeIfdEntry(view, mainOffset + 38, 0x8825, 4, 1, gpsOffset);
view.setUint32(mainEnd, options.cycle ? mainOffset : 0, true);
result.set(make, makeOffset);
result.set(date, dateOffset);
view.setUint16(gpsOffset, gpsEntries, true);
writeIfdEntry(view, gpsOffset + 2, 1, 2, 2, 0x4e);
writeIfdEntry(view, gpsOffset + 14, 29, 2, gpsDate.byteLength, gpsDateOffset);
view.setUint32(gpsEnd, 0, true);
result.set(gpsDate, gpsDateOffset);
return result;
}
export function malformedPngLengthFixture(): Uint8Array {
const image = pngFixture();
const malformed = image.slice();
new DataView(malformed.buffer).setUint32(8, 0xfffffff0, false);
return malformed;
}
export function toArrayBuffer(value: Uint8Array): ArrayBuffer {
return value.slice().buffer as ArrayBuffer;
}
function jpegSegment(marker: number, payload: Uint8Array): Uint8Array {
return concat(bytes(0xff, marker), u16be(payload.byteLength + 2), payload);
}
function iptcDataset(dataset: number, value: string): Uint8Array {
const encoded = encoder.encode(value);
return concat(bytes(0x1c, 2, dataset), u16be(encoded.byteLength), encoded);
}
function pngChunk(type: string, data: Uint8Array): Uint8Array {
const typeBytes = encoder.encode(type);
const checksumInput = concat(typeBytes, data);
return concat(
u32be(data.byteLength),
checksumInput,
u32be(crc32(checksumInput, 16 * 1024 * 1024)),
);
}
function riffChunk(type: string, data: Uint8Array): Uint8Array {
return concat(
encoder.encode(type),
u32le(data.byteLength),
data,
data.byteLength % 2 ? bytes(0) : bytes(),
);
}
function writeIfdEntry(
view: DataView,
offset: number,
tag: number,
type: number,
count: number,
value: number,
): void {
view.setUint16(offset, tag, true);
view.setUint16(offset + 2, type, true);
view.setUint32(offset + 4, count, true);
if (type === 3 && count === 1) view.setUint16(offset + 8, value, true);
else view.setUint32(offset + 8, value, true);
}
function concat(...parts: readonly Uint8Array[]): Uint8Array {
const size = parts.reduce((total, part) => total + part.byteLength, 0);
const result = new Uint8Array(size);
let offset = 0;
for (const part of parts) {
result.set(part, offset);
offset += part.byteLength;
}
return result;
}
function bytes(...values: readonly number[]): Uint8Array {
return Uint8Array.from(values);
}
function u16be(value: number): Uint8Array {
return bytes((value >>> 8) & 0xff, value & 0xff);
}
function u32be(value: number): Uint8Array {
return bytes(
(value >>> 24) & 0xff,
(value >>> 16) & 0xff,
(value >>> 8) & 0xff,
value & 0xff,
);
}
function u32le(value: number): Uint8Array {
return bytes(
value & 0xff,
(value >>> 8) & 0xff,
(value >>> 16) & 0xff,
(value >>> 24) & 0xff,
);
}
tests/privacy/detect.test.ts
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import { describe, expect, it } from "vitest";
import {
detectKind,
fileExtension,
inventoryIdentity,
} from "../../src/privacy";
import { jpegFixture, pngFixture, webpFixture } from "../fixtures/images";
describe("file identity", () => {
it("detects supported containers from bytes", () => {
expect(detectKind(jpegFixture())).toBe("jpeg");
expect(detectKind(pngFixture())).toBe("png");
expect(detectKind(webpFixture())).toBe("webp");
expect(detectKind(Uint8Array.from([0x25, 0x50, 0x44, 0x46, 0x2d]))).toBe(
"pdf",
);
});
it("normalizes leaf extensions without trusting paths", () => {
expect(fileExtension("folder\\PHOTO.JPEG")).toBe("jpeg");
expect(fileExtension(".hidden")).toBe("");
expect(fileExtension("no-extension")).toBe("");
});
it("reports claimed and extension mismatches", () => {
const identity = inventoryIdentity(
"portrait.jpg",
"image/jpeg",
pngFixture(),
);
expect(identity).toMatchObject({
detectedKind: "png",
detectedType: "image/png",
typeMatch: "mismatch",
});
});
it("does not infer an unknown payload from its extension", () => {
const identity = inventoryIdentity(
"claim.png",
"image/png",
Uint8Array.from([1, 2, 3]),
);
expect(identity.detectedKind).toBe("unknown");
expect(identity.typeMatch).toBe("unknown");
});
});
tests/privacy/limits.test.ts
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import { describe, expect, it } from "vitest";
import {
assertBatchFiles,
PrivacyLimitError,
resolveLimits,
} from "../../src/privacy";
describe("privacy resource limits", () => {
it("rejects too many, oversized and collectively oversized files", () => {
expect(() =>
assertBatchFiles([{ size: 1 }, { size: 1 }], {
...resolveLimits(),
maxFiles: 1,
}),
).toThrow(PrivacyLimitError);
expect(() =>
assertBatchFiles([{ size: 11 }], {
...resolveLimits(),
maxFileBytes: 10,
}),
).toThrow(PrivacyLimitError);
expect(() =>
assertBatchFiles([{ size: 6 }, { size: 6 }], {
...resolveLimits(),
maxFileBytes: 10,
maxBatchBytes: 10,
}),
).toThrow(PrivacyLimitError);
});
it("rejects invalid limit overrides", () => {
expect(() => resolveLimits({ maxFiles: 0 })).toThrow(
/positive safe integer/iu,
);
expect(() => resolveLimits({ maxFileBytes: Number.NaN })).toThrow(
/positive safe integer/iu,
);
});
});
tests/privacy/report.test.ts
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// @vitest-environment node
import { unzipSync } from "fflate";
import { describe, expect, it } from "vitest";
import {
buildSanitizationReport,
createBatchArchive,
createBatchReport,
serializeReport,
type ImageScanResult,
type MetadataFinding,
} from "../../src/privacy";
const sensitive: MetadataFinding = {
id: "gps-1",
category: "location",
risk: "sensitive",
source: "EXIF",
label: "GPS Latitude",
value: "48.1 N",
};
describe("sanitization and batch reports", () => {
it("marks a complete sensitive-free output verified and records removals", () => {
const source = result({ findings: [sensitive] });
const output = result({ id: "clean", name: "clean.png", findings: [] });
const report = buildSanitizationReport(
source,
output,
"clean.png",
"image/png",
20,
comparison(true),
);
expect(report.status).toBe("verified");
expect(report.removed).toEqual([sensitive]);
expect(report.preserved).toEqual([]);
expect(report.orientationNormalized).toBe(true);
expect(report.disclaimer).toMatch(/not an anonymity guarantee/iu);
});
it("fails a partial or sensitive output re-scan", () => {
const source = result({ findings: [sensitive] });
const output = result({
id: "clean",
findings: [sensitive],
coverage: {
projectScanner: "partial",
secondaryScanner: "complete",
notes: [],
},
});
const report = buildSanitizationReport(
source,
output,
"clean.png",
"image/png",
20,
comparison(false),
);
expect(report.status).toBe("failed");
expect(report.preserved).toEqual([sensitive]);
expect(report.incomplete).not.toEqual([]);
});
it("reports an unknown browser-generated output chunk as a warning", () => {
const source = result();
const output = result({
id: "clean",
findings: [
{
id: "private-1",
category: "unknown",
risk: "context",
source: "PNG",
label: "Private chunk deBG",
value: "16 bytes",
},
],
blocks: [{ kind: "deBG", offset: 40, length: 16 }],
});
const report = buildSanitizationReport(
source,
output,
"clean.png",
"image/png",
20,
comparison(true),
);
expect(report.status).toBe("warning");
expect(report.generated).toHaveLength(1);
expect(report.incomplete.join(" ")).toContain("deBG");
});
it("fails a changed decoded sample for lossless PNG", () => {
const report = buildSanitizationReport(
result(),
result({ id: "clean" }),
"clean.png",
"image/png",
20,
comparison(false),
);
expect(report.status).toBe("failed");
expect(report.incomplete.join(" ")).toMatch(/pixel sample/iu);
});
it("produces deterministic, safe JSON and a stored batch ZIP", async () => {
const source = result({ name: "../private.png", findings: [sensitive] });
const output = result({ id: "clean", name: "private.clean.png" });
const report = buildSanitizationReport(
source,
output,
"../same.png",
"image/png",
3,
comparison(true),
);
const assets = [
{ blob: new Blob([Uint8Array.of(1, 2, 3)]), report },
{ blob: new Blob([Uint8Array.of(4, 5, 6)]), report },
];
const generatedAt = "2026-09-01T00:00:00.000Z";
const batch = createBatchReport([source], assets, generatedAt);
const json = serializeReport(batch);
expect(JSON.parse(json)).toMatchObject({ schemaVersion: 1, generatedAt });
expect(json).toContain("report may itself contain sensitive");
const archive = await createBatchArchive([source], assets, generatedAt);
const entries = unzipSync(new Uint8Array(await archive.arrayBuffer()));
expect(Object.keys(entries).sort()).toEqual([
"images/_same-2.png",
"images/_same.png",
"privacy-tools-report.json",
]);
expect(
JSON.parse(
new TextDecoder().decode(entries["privacy-tools-report.json"]),
),
).toMatchObject({ schemaVersion: 1, generatedAt });
});
it("bounds archive entry count before reading output blobs", async () => {
const source = result();
const output = result({ id: "clean" });
const report = buildSanitizationReport(
source,
output,
"clean.png",
"image/png",
1,
comparison(true),
);
const asset = { blob: new Blob([Uint8Array.of(0)]), report };
await expect(
createBatchArchive(
[source],
Array.from({ length: 101 }, () => asset),
),
).rejects.toThrow(/Archive image count/iu);
});
});
function comparison(identical: boolean) {
return {
method: "oriented-256px-sample" as const,
sourceDigest: "source-sample",
outputDigest: identical ? "source-sample" : "output-sample",
identical,
note: "test comparison",
};
}
function result(overrides: Partial<ImageScanResult> = {}): ImageScanResult {
return {
id: "source",
name: "source.png",
safeName: "source.png",
size: 100,
lastModified: 0,
sha256: "a".repeat(64),
identity: {
claimedType: "image/png",
extension: "png",
detectedKind: "png",
detectedType: "image/png",
typeMatch: "match",
},
width: 2,
height: 1,
orientation: 1,
animated: false,
multiImage: false,
deepSupported: true,
cleanable: true,
findings: [],
blocks: [],
warnings: [],
coverage: {
projectScanner: "complete",
secondaryScanner: "complete",
notes: [],
},
...overrides,
};
}
tests/privacy/scanner.test.ts
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import { describe, expect, it } from "vitest";
import { PrivacyLimitError, scanImageBytes } from "../../src/privacy";
import {
jpegFixture,
malformedPngLengthFixture,
pngFixture,
toArrayBuffer,
webpFixture,
} from "../fixtures/images";
describe("bounded image metadata scanner", () => {
it("extracts JPEG EXIF, IPTC, XMP, JFIF, ICC and provenance", async () => {
const result = await scan("camera.jpg", "image/jpeg", jpegFixture());
expect(result).toMatchObject({
width: 3,
height: 2,
orientation: 1,
animated: false,
multiImage: false,
deepSupported: true,
cleanable: true,
});
expect(result.coverage.projectScanner).toBe("complete");
expect(result.findings).toEqual(
expect.arrayContaining([
expect.objectContaining({ category: "location" }),
expect.objectContaining({ category: "identity" }),
expect.objectContaining({ category: "timestamp" }),
expect.objectContaining({ category: "device" }),
expect.objectContaining({ category: "colour-profile" }),
expect.objectContaining({ category: "provenance" }),
]),
);
expect(result.blocks.map((block) => block.kind)).toEqual(
expect.arrayContaining(["APP0", "APP1", "APP2", "APP11", "APP13", "COM"]),
);
});
it("extracts PNG text, compressed text, EXIF, XMP, ICC and private chunks", async () => {
const result = await scan("fixture.png", "image/png", pngFixture());
expect(result).toMatchObject({
width: 2,
height: 1,
orientation: 1,
cleanable: true,
});
expect(result.coverage.projectScanner).toBe("complete");
expect(
result.findings.some((finding) => finding.value.includes("Alice PNG")),
).toBe(true);
expect(
result.findings.some((finding) => finding.value.includes("PNG Alice")),
).toBe(true);
expect(result.blocks.map((block) => block.kind)).toEqual(
expect.arrayContaining(["tEXt", "zTXt", "iTXt", "eXIf", "iCCP", "vpAg"]),
);
});
it("extracts WebP EXIF, XMP, ICC and extended dimensions", async () => {
const result = await scan("fixture.webp", "image/webp", webpFixture());
expect(result).toMatchObject({
width: 4,
height: 3,
orientation: 1,
animated: false,
cleanable: true,
});
expect(result.coverage.projectScanner).toBe("complete");
expect(result.findings).toEqual(
expect.arrayContaining([
expect.objectContaining({ category: "location" }),
expect.objectContaining({ category: "identity" }),
expect.objectContaining({ category: "colour-profile" }),
]),
);
});
it("makes animated images inspect-only", async () => {
const png = await scan(
"animated.png",
"image/png",
pngFixture({ animated: true }),
);
const webp = await scan(
"animated.webp",
"image/webp",
webpFixture({ animated: true }),
);
expect(png.animated).toBe(true);
expect(webp.animated).toBe(true);
expect(png.cleanable).toBe(false);
expect(webp.cleanable).toBe(false);
});
it("reports trailing data rather than hiding it", async () => {
const jpeg = await scan(
"tail.jpg",
"image/jpeg",
jpegFixture({ trailing: true }),
);
const png = await scan(
"tail.png",
"image/png",
pngFixture({ trailing: true }),
);
expect(
jpeg.findings.some((finding) => finding.label === "Trailing data"),
).toBe(true);
expect(
png.findings.some((finding) => finding.label === "Trailing data"),
).toBe(true);
});
it("stops malformed chunks and TIFF cycles and refuses clean-copy eligibility", async () => {
const malformed = await scan(
"malformed.png",
"image/png",
malformedPngLengthFixture(),
);
const cyclic = await scan(
"cycle.png",
"image/png",
pngFixture({ cycleTiff: true }),
);
expect(malformed.coverage.projectScanner).toBe("partial");
expect(malformed.cleanable).toBe(false);
expect(cyclic.coverage.projectScanner).toBe("partial");
expect(cyclic.warnings.join(" ")).toMatch(/cycle/iu);
expect(cyclic.cleanable).toBe(false);
});
it("bounds compressed metadata and finding values", async () => {
const image = pngFixture({ inflatedCommentBytes: 1024 });
const result = await scanImageBytes(input("bomb.png", "image/png", image), {
maxInflatedMetadataBytes: 32,
maxFindingValueChars: 24,
});
expect(result.coverage.projectScanner).toBe("partial");
expect(result.warnings.join(" ")).toMatch(/limit|fully read/iu);
expect(result.findings.every((finding) => finding.value.length <= 25)).toBe(
true,
);
});
it("bounds chunk counts and decoded dimensions", async () => {
const image = pngFixture();
const tooManyChunks = await scanImageBytes(
input("chunks.png", "image/png", image),
{ maxMetadataBlocks: 3 },
);
const tooManyPixels = await scanImageBytes(
input("pixels.png", "image/png", image),
{ maxPixels: 1 },
);
expect(tooManyChunks.coverage.projectScanner).toBe("partial");
expect(tooManyChunks.cleanable).toBe(false);
expect(tooManyPixels.cleanable).toBe(false);
expect(tooManyPixels.warnings.join(" ")).toMatch(/processing limit/iu);
});
it("bounds aggregate normalized finding text", async () => {
const image = pngFixture();
const result = await scanImageBytes(input("text.png", "image/png", image), {
maxFindingTextChars: 100,
});
expect(result.coverage.projectScanner).toBe("partial");
expect(result.coverage.notes.join(" ")).toMatch(/text limit/iu);
expect(result.cleanable).toBe(false);
});
it("treats invalid PNG CRCs as partial coverage", async () => {
const image = pngFixture().slice();
image[image.length - 1] = (image[image.length - 1] ?? 0) ^ 0xff;
const result = await scan("crc.png", "image/png", image);
expect(result.coverage.projectScanner).toBe("partial");
expect(result.warnings.join(" ")).toMatch(/invalid CRC/iu);
expect(result.cleanable).toBe(false);
});
it("contains malformed HEIF-family input in the secondary adapter", async () => {
const malformedHeic = Uint8Array.from([
0, 0, 0, 16, 0x66, 0x74, 0x79, 0x70, 0x68, 0x65, 0x69, 0x63, 0, 0, 0, 0,
]);
const result = await scan("broken.heic", "image/heic", malformedHeic);
expect(result.identity.detectedKind).toBe("heic");
expect(["failed", "unsupported", "partial"]).toContain(
result.coverage.secondaryScanner,
);
expect(result.cleanable).toBe(false);
});
it("rejects dishonest declared sizes and file limits before parsing", async () => {
const image = pngFixture();
await expect(
scanImageBytes({
...input("wrong.png", "image/png", image),
size: image.length + 1,
}),
).rejects.toThrow(/does not match/iu);
await expect(
scanImageBytes(input("large.png", "image/png", image), {
maxFileBytes: image.length - 1,
}),
).rejects.toBeInstanceOf(PrivacyLimitError);
});
it("keeps non-image formats at inventory-only coverage", async () => {
const pdf = Uint8Array.from([
0x25, 0x50, 0x44, 0x46, 0x2d, 0x31, 0x2e, 0x37,
]);
const result = await scan("document.pdf", "application/pdf", pdf);
expect(result.identity.detectedKind).toBe("pdf");
expect(result.deepSupported).toBe(false);
expect(result.cleanable).toBe(false);
expect(result.coverage.projectScanner).toBe("unsupported");
});
});
async function scan(name: string, type: string, bytes: Uint8Array) {
return scanImageBytes(input(name, type, bytes));
}
function input(name: string, type: string, bytes: Uint8Array) {
return {
id: `fixture-${name}`,
name,
claimedType: type,
size: bytes.byteLength,
lastModified: 0,
bytes: toArrayBuffer(bytes),
};
}
tsconfig.app.json
+27
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{
"compilerOptions": {
"tsBuildInfoFile": "./node_modules/.tmp/tsconfig.app.tsbuildinfo",
"target": "ES2023",
"lib": ["ES2023", "DOM", "DOM.Iterable"],
"module": "ESNext",
"types": ["vite/client"],
"allowArbitraryExtensions": true,
"skipLibCheck": true,
"moduleResolution": "Bundler",
"allowImportingTsExtensions": true,
"verbatimModuleSyntax": true,
"moduleDetection": "force",
"noEmit": true,
"jsx": "react-jsx",
"noUnusedLocals": true,
"noUnusedParameters": true,
"erasableSyntaxOnly": true,
"noFallthroughCasesInSwitch": true,
"strict": true,
"noUncheckedIndexedAccess": true,
"useDefineForClassFields": true,
"resolveJsonModule": true,
"isolatedModules": true
},
"include": ["src", "tests"]
}
tsconfig.json
+11
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{
"files": [],
"references": [
{
"path": "./tsconfig.app.json"
},
{
"path": "./tsconfig.node.json"
}
]
}
tsconfig.node.json
+24
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{
"compilerOptions": {
"tsBuildInfoFile": "./node_modules/.tmp/tsconfig.node.tsbuildinfo",
"target": "ES2023",
"lib": ["ES2023"],
"module": "ESNext",
"types": ["node"],
"skipLibCheck": true,
"moduleResolution": "Bundler",
"allowImportingTsExtensions": true,
"verbatimModuleSyntax": true,
"moduleDetection": "force",
"noEmit": true,
"strict": true,
"noUnusedLocals": true,
"noUnusedParameters": true
},
"include": [
"vite.config.ts",
"playwright.config.ts",
"eslint.config.mjs",
"scripts/**/*.mjs"
]
}
vite.config.ts
+16
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/// <reference types="vitest/config" />
import { defineConfig } from "vite";
import react from "@vitejs/plugin-react";
export default defineConfig({
base: "./",
plugins: [react()],
test: {
environment: "jsdom",
setupFiles: "./src/test/setup.ts",
css: true,
maxWorkers: 2,
restoreMocks: true,
exclude: ["tests/browser/**", "node_modules/**", "dist/**"],
},
});