Release EPUB Tools 0.1.0

2026-09-01 02:39:03 +02:00
commit dd36d5a85c
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 node_modules/
 dist/
 release/*.zip
 release/*.zip.sha256
 coverage/
 playwright-report/
 test-results/
 *.tsbuildinfo
 .DS_Store
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@add-ideas:registry=https://git.add-ideas.de/api/packages/lotobo/npm/
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 # Changelog
 ## 0.1.0 - 2026-09-01
 - Added the initial local-first EPUB Tools workbench.
 - Added EPUB 2/3 package, metadata, manifest, spine, navigation and NCX inspection.
 - Added bounded link/structure validation and a sandboxed, sanitized, script-free reader with local images.
 - Added metadata, package-tree, validation, cover, plain-text and sanitized-chapter exports.
 - Added Dublin Core and declared-cover editing plus normalized EPUB rebuilding.
 - Added strict path, size, entry-count, ratio, XML/entity, encryption and active-content policies.
 - Added Toolbox integration, offline shell, deterministic release packaging, unit fixtures and real cross-browser EPUB workflow tests.
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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.
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    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>.
@@ -0,0 +1,3 @@
 # Licences
 The application is GPL-3.0-or-later. Generated release artifacts include an exact runtime dependency licence inventory in `npm-runtime-licenses.txt`.
@@ -0,0 +1,40 @@
 # EPUB Tools
 EPUB Tools is a standalone, local-first EPUB 2/3 reader and publication workbench for the [add·ideas Toolbox](https://git.add-ideas.de/lotobo/toolbox-portal). Books are opened from a browser `File`; no upload, account, analytics, or server-side conversion is involved.
 ## Version 0.1.0
 - Opens strict ZIP-based EPUB containers and parses `container.xml`, OPF metadata, manifest, spine, EPUB 3 navigation documents, and EPUB 2 NCX navigation.
 - Shows a reading-order sidebar and renders XHTML/HTML/SVG content in a sandboxed, script-free iframe. Local images are resolved to temporary object URLs.
 - Inventories the package and checks required metadata, mimetype ordering/compression, manifest/spine targets, navigation, active content, external resources, missing relative links, hidden entries, encryption metadata, and signatures.
 - Edits common Dublin Core fields, replaces an existing declared JPEG/PNG/WebP/SVG cover, exports metadata/report/tree JSON, extracts the cover, exports reading-order text, and downloads sanitized chapters.
 - Rebuilds a fresh EPUB with the uncompressed mimetype first, sorted paths, optional normalized timestamps, updated OPF metadata, and an optional replacement cover.
 The validator is a focused preflight, not a browser port of EPUBCheck. Version 0.1 does not claim complete schema, CSS, accessibility, media-overlay, signature, DRM, or font-licence validation. DRM is detected and reported; it is never bypassed. Rebuilds are disabled when encryption metadata is present and invalidate existing signatures.
 ## Safety limits
 - 512 MiB source file, 20,000 entries, 1 GiB declared expanded total
 - 64 MiB per resource, 500:1 maximum declared expansion ratio
 - 16 MiB package/chapter parse limit
 - Link validation scans at most 500 content documents and 32 MiB total, with every skipped scope disclosed
 - Reader image resolution is capped at 25 MiB per image; plain-text export at 32 MiB
 - Absolute, backslash, drive-letter, NUL, and parent-traversal archive paths are rejected
 DTD/entity declarations, ZIP encryption, scripts, forms, frames, objects, external reader resources, navigation, stylesheet links, CSS imports/URLs, and event handlers are blocked or removed from the reader surface. Rendering still depends on the current browser and installed fonts.
 ## Development
 Requires Node.js 22 and npm 11.
 ```sh
 npm ci
 npm run check
 npm run test:browser
 ```
 `npm run release:artifact` creates `release/epub-tools-0.1.0.zip` and its SHA-256 sidecar.
 ## Licence
 GPL-3.0-or-later. Runtime dependencies retain their own licences; see [THIRD_PARTY_NOTICES.md](THIRD_PARTY_NOTICES.md).
@@ -0,0 +1,3 @@
 # Security
 Please report vulnerabilities privately to the repository owner. Do not attach sensitive source files to public issues. Imported inputs are untrusted; parsers must remain bounded and must not execute active content or fetch external resources.
@@ -0,0 +1,7 @@
 # Corresponding source
 The corresponding source for EPUB Tools 0.1.0 is available at:
 https://git.add-ideas.de/lotobo/epub-tools/src/tag/v0.1.0
 Build with Node.js 22, npm 11, `npm ci`, and `npm run release:artifact`.
@@ -0,0 +1,11 @@
 # Third-party notices
 Production release inventories reproduce exact dependency licence texts under `LICENSES/npm-runtime-licenses.txt`.
 - `@zip.js/zip.js` 2.9.0 — BSD-3-Clause — bounded ZIP reading and EPUB rebuilding.
 - `dompurify` 3.4.14 — MPL-2.0 OR Apache-2.0 — active-content sanitization before sandboxed rendering.
 - Toolbox contract, shell, and test packages 0.2.3 — Apache-2.0.
 - `@add-ideas/toolbox-helpers` 0.1.0 — GPL-3.0-or-later — bounded decoding, filenames, and browser downloads.
 - React and React DOM 19.2.8 — MIT.
 EPUB publications opened by a user are not bundled and retain their own copyright and licence terms.
@@ -0,0 +1,5 @@
 # Accessibility
 The application uses labelled file inputs, fields, tabs, status/error regions, keyboard-operable chapter and action buttons, visible focus indicators, responsive layouts, and scrollable tables/readers. The iframe has a chapter-specific accessible title.
 Reader sanitization can remove scripted or form-based interactions by design. EPUB-internal navigation is disabled in v0.1; the Toolbox reading-order sidebar remains keyboard accessible. Publisher content can itself have poor semantics, contrast, directionality, alt text, or reading order. The safe reader does not certify EPUB accessibility and its fallback stylesheet may change publisher presentation.
@@ -0,0 +1,13 @@
 # Architecture
 The app is a relocatable static React application using the Toolbox shell and contract. EPUB work is divided into small TypeScript modules under `src/epub/`:
 - `archive.ts` applies ZIP/path/entry/ratio limits and opens the container with zip.js.
 - `xml.ts`, `package.ts`, and `paths.ts` decode bounded XML, reject DTD/entity input, parse OPF/navigation/NCX, and resolve package-relative references without traversal.
 - `validation.ts` performs bounded package and cross-document diagnostics and reports skipped scope.
 - `reader.ts` sanitizes content with DOMPurify, neutralizes navigation and CSS URLs, resolves bounded local images, injects a restrictive iframe CSP, and returns object URLs with an explicit revocation lifecycle.
 - `export.ts` patches Dublin Core metadata and streams entries into a fresh normalized EPUB. It also produces JSON, cover, chapter, and reading-order text exports.
 zip.js receives a lazy browser `BlobReader`, performs CRC checks when entry data is read, and can use web workers. React retains one open reader and closes the previous reader when a new book replaces it. The original File is immutable; all changes exist only in staged React state or a newly downloaded Blob.
 The safe reader uses both sanitization and an iframe without sandbox permissions. Its `srcdoc` adds `default-src 'none'` and permits only inline styles plus local data/blob image/font/media URLs. Publisher stylesheet links are intentionally removed in v0.1.
@@ -0,0 +1,9 @@
 # Privacy and security
 All source and generated publication data remains in the browser. The app has no telemetry, account, analytics, remote font, CDN, or default network integration. The production CSP keeps `connect-src` and worker sources same-origin.
 EPUB input is adversarial. Before extraction the app enforces file, entry, expanded-size, per-entry, expansion-ratio, duplicate-name, and path rules. Required XML is size-bounded, supports UTF-8/UTF-16, and rejects DTD/entity declarations. ZIP-encrypted entries cannot be read. `META-INF/encryption.xml` is reported because it can describe valid font obfuscation or DRM; the app does not distinguish every scheme and never attempts circumvention.
 Content documents are never mounted into the application DOM. DOMPurify removes active elements and event handlers, navigation and resource references are neutralized or replaced with bounded local object URLs, and rendering happens inside a permissionless sandboxed iframe with its own restrictive CSP. Temporary object URLs are revoked when chapters change.
 Validation is intentionally bounded and incomplete. It does not establish publication safety, conformance, accessibility, authenticity, ownership, or freedom from hidden data. Reports identify the checks performed and relevant unsupported areas. Rebuilding changes compressed bytes and invalidates signatures; it is disabled for encrypted publications.
@@ -0,0 +1,37 @@
 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 },
  },
 );
@@ -0,0 +1,19 @@
 <!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="Read, inspect and repair EPUB publications 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>EPUB Tools</title>
  </head>
  <body>
    <div id="root"></div>
    <script type="module" src="./src/main.tsx"></script>
  </body>
 </html>
@@ -0,0 +1,73 @@
 {
  "name": "epub-tools",
  "version": "0.1.0",
  "description": "Read, inspect and repair EPUB publications locally in the browser.",
  "license": "GPL-3.0-or-later",
  "author": "Albrecht Degering",
  "repository": {
    "type": "git",
    "url": "git+https://git.add-ideas.de/lotobo/epub-tools.git"
  },
  "homepage": "https://git.add-ideas.de/lotobo/epub-tools",
  "bugs": {
    "url": "https://git.add-ideas.de/lotobo/epub-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",
    "@zip.js/zip.js": "2.9.0",
    "dompurify": "3.4.14",
    "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"
 }
@@ -0,0 +1,21 @@
 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"] } },
  ],
 });
@@ -0,0 +1,11 @@
 # Changelog
 ## 0.1.0 - 2026-09-01
 - Added the initial local-first EPUB Tools workbench.
 - Added EPUB 2/3 package, metadata, manifest, spine, navigation and NCX inspection.
 - Added bounded link/structure validation and a sandboxed, sanitized, script-free reader with local images.
 - Added metadata, package-tree, validation, cover, plain-text and sanitized-chapter exports.
 - Added Dublin Core and declared-cover editing plus normalized EPUB rebuilding.
 - Added strict path, size, entry-count, ratio, XML/entity, encryption and active-content policies.
 - Added Toolbox integration, offline shell, deterministic release packaging, unit fixtures and real cross-browser EPUB workflow tests.
@@ -0,0 +1,3 @@
 # 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.
@@ -0,0 +1,674 @@
                    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
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  To protect your rights, we need to prevent others from denying you
 these rights or asking you to surrender the rights.  Therefore, you have
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 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:
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  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
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  "This License" refers to version 3 of the GNU General Public License.
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  A "User Product" is either (1) a "consumer product", which means any
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  "Installation Information" for a User Product means any methods,
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 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
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  If you convey an object code work under this section in, or with, or
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  The requirement to provide Installation Information does not include a
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  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
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  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
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  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
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 License, you may add to a covered work material governed by the terms
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  If you add terms to a covered work in accord with this section, you
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  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
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 this License (including any patent licenses granted under the third
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  However, if you cease all violation of this License, then your
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 holder fails to notify you of the violation by some reasonable means
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  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
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 copyright holder, and you cure the violation prior to 30 days after
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  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>.
@@ -0,0 +1,3 @@
 # Licences
 The application is GPL-3.0-or-later. Generated release artifacts include an exact runtime dependency licence inventory in `npm-runtime-licenses.txt`.
@@ -0,0 +1,40 @@
 # EPUB Tools
 EPUB Tools is a standalone, local-first EPUB 2/3 reader and publication workbench for the [add·ideas Toolbox](https://git.add-ideas.de/lotobo/toolbox-portal). Books are opened from a browser `File`; no upload, account, analytics, or server-side conversion is involved.
 ## Version 0.1.0
 - Opens strict ZIP-based EPUB containers and parses `container.xml`, OPF metadata, manifest, spine, EPUB 3 navigation documents, and EPUB 2 NCX navigation.
 - Shows a reading-order sidebar and renders XHTML/HTML/SVG content in a sandboxed, script-free iframe. Local images are resolved to temporary object URLs.
 - Inventories the package and checks required metadata, mimetype ordering/compression, manifest/spine targets, navigation, active content, external resources, missing relative links, hidden entries, encryption metadata, and signatures.
 - Edits common Dublin Core fields, replaces an existing declared JPEG/PNG/WebP/SVG cover, exports metadata/report/tree JSON, extracts the cover, exports reading-order text, and downloads sanitized chapters.
 - Rebuilds a fresh EPUB with the uncompressed mimetype first, sorted paths, optional normalized timestamps, updated OPF metadata, and an optional replacement cover.
 The validator is a focused preflight, not a browser port of EPUBCheck. Version 0.1 does not claim complete schema, CSS, accessibility, media-overlay, signature, DRM, or font-licence validation. DRM is detected and reported; it is never bypassed. Rebuilds are disabled when encryption metadata is present and invalidate existing signatures.
 ## Safety limits
 - 512 MiB source file, 20,000 entries, 1 GiB declared expanded total
 - 64 MiB per resource, 500:1 maximum declared expansion ratio
 - 16 MiB package/chapter parse limit
 - Link validation scans at most 500 content documents and 32 MiB total, with every skipped scope disclosed
 - Reader image resolution is capped at 25 MiB per image; plain-text export at 32 MiB
 - Absolute, backslash, drive-letter, NUL, and parent-traversal archive paths are rejected
 DTD/entity declarations, ZIP encryption, scripts, forms, frames, objects, external reader resources, navigation, stylesheet links, CSS imports/URLs, and event handlers are blocked or removed from the reader surface. Rendering still depends on the current browser and installed fonts.
 ## Development
 Requires Node.js 22 and npm 11.
 ```sh
 npm ci
 npm run check
 npm run test:browser
 ```
 `npm run release:artifact` creates `release/epub-tools-0.1.0.zip` and its SHA-256 sidecar.
 ## Licence
 GPL-3.0-or-later. Runtime dependencies retain their own licences; see [THIRD_PARTY_NOTICES.md](THIRD_PARTY_NOTICES.md).
@@ -0,0 +1,3 @@
 # Security
 Please report vulnerabilities privately to the repository owner. Do not attach sensitive source files to public issues. Imported inputs are untrusted; parsers must remain bounded and must not execute active content or fetch external resources.
@@ -0,0 +1,7 @@
 # Corresponding source
 The corresponding source for EPUB Tools 0.1.0 is available at:
 https://git.add-ideas.de/lotobo/epub-tools/src/tag/v0.1.0
 Build with Node.js 22, npm 11, `npm ci`, and `npm run release:artifact`.
@@ -0,0 +1,11 @@
 # Third-party notices
 Production release inventories reproduce exact dependency licence texts under `LICENSES/npm-runtime-licenses.txt`.
 - `@zip.js/zip.js` 2.9.0 — BSD-3-Clause — bounded ZIP reading and EPUB rebuilding.
 - `dompurify` 3.4.14 — MPL-2.0 OR Apache-2.0 — active-content sanitization before sandboxed rendering.
 - Toolbox contract, shell, and test packages 0.2.3 — Apache-2.0.
 - `@add-ideas/toolbox-helpers` 0.1.0 — GPL-3.0-or-later — bounded decoding, filenames, and browser downloads.
 - React and React DOM 19.2.8 — MIT.
 EPUB publications opened by a user are not bundled and retain their own copyright and licence terms.
@@ -0,0 +1,5 @@
 # Accessibility
 The application uses labelled file inputs, fields, tabs, status/error regions, keyboard-operable chapter and action buttons, visible focus indicators, responsive layouts, and scrollable tables/readers. The iframe has a chapter-specific accessible title.
 Reader sanitization can remove scripted or form-based interactions by design. EPUB-internal navigation is disabled in v0.1; the Toolbox reading-order sidebar remains keyboard accessible. Publisher content can itself have poor semantics, contrast, directionality, alt text, or reading order. The safe reader does not certify EPUB accessibility and its fallback stylesheet may change publisher presentation.
@@ -0,0 +1,13 @@
 # Architecture
 The app is a relocatable static React application using the Toolbox shell and contract. EPUB work is divided into small TypeScript modules under `src/epub/`:
 - `archive.ts` applies ZIP/path/entry/ratio limits and opens the container with zip.js.
 - `xml.ts`, `package.ts`, and `paths.ts` decode bounded XML, reject DTD/entity input, parse OPF/navigation/NCX, and resolve package-relative references without traversal.
 - `validation.ts` performs bounded package and cross-document diagnostics and reports skipped scope.
 - `reader.ts` sanitizes content with DOMPurify, neutralizes navigation and CSS URLs, resolves bounded local images, injects a restrictive iframe CSP, and returns object URLs with an explicit revocation lifecycle.
 - `export.ts` patches Dublin Core metadata and streams entries into a fresh normalized EPUB. It also produces JSON, cover, chapter, and reading-order text exports.
 zip.js receives a lazy browser `BlobReader`, performs CRC checks when entry data is read, and can use web workers. React retains one open reader and closes the previous reader when a new book replaces it. The original File is immutable; all changes exist only in staged React state or a newly downloaded Blob.
 The safe reader uses both sanitization and an iframe without sandbox permissions. Its `srcdoc` adds `default-src 'none'` and permits only inline styles plus local data/blob image/font/media URLs. Publisher stylesheet links are intentionally removed in v0.1.
@@ -0,0 +1,9 @@
 # Privacy and security
 All source and generated publication data remains in the browser. The app has no telemetry, account, analytics, remote font, CDN, or default network integration. The production CSP keeps `connect-src` and worker sources same-origin.
 EPUB input is adversarial. Before extraction the app enforces file, entry, expanded-size, per-entry, expansion-ratio, duplicate-name, and path rules. Required XML is size-bounded, supports UTF-8/UTF-16, and rejects DTD/entity declarations. ZIP-encrypted entries cannot be read. `META-INF/encryption.xml` is reported because it can describe valid font obfuscation or DRM; the app does not distinguish every scheme and never attempts circumvention.
 Content documents are never mounted into the application DOM. DOMPurify removes active elements and event handlers, navigation and resource references are neutralized or replaced with bounded local object URLs, and rendering happens inside a permissionless sandboxed iframe with its own restrictive CSP. Temporary object URLs are revoked when chapters change.
 Validation is intentionally bounded and incomplete. It does not establish publication safety, conformance, accessibility, authenticity, ownership, or freedom from hidden data. Reports identify the checks performed and relevant unsupported areas. Rebuilding changes compressed bytes and invalidates signatures; it is disabled for encrypted publications.
@@ -0,0 +1 @@
 <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64" role="img" aria-label="EPUB 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">EP</text></svg>
@@ -0,0 +1,18 @@
 {
  "name": "EPUB Tools",
  "short_name": "EPUB",
  "description": "Read, inspect and repair EPUB publications 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"
    }
  ]
 }
@@ -0,0 +1,54 @@
 const CACHE_PREFIX = "epub-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;
        }),
    ),
  );
 });
@@ -0,0 +1,41 @@
 {
  "$schema": "https://git.add-ideas.de/lotobo/toolbox-sdk/raw/branch/main/schemas/toolbox-app.v1.schema.json",
  "schemaVersion": 1,
  "id": "de.add-ideas.epub-tools",
  "name": "EPUB Tools",
  "version": "0.1.0",
  "description": "Read, inspect and repair EPUB publications locally in the browser.",
  "entry": "./",
  "icon": "./favicon.svg",
  "categories": ["documents", "ebooks", "publishing"],
  "tags": ["epub", "ebook", "metadata", "reader", "repair"],
  "integration": {
    "contextVersion": 1,
    "launchModes": ["navigate", "new-tab"],
    "embedding": "unsupported"
  },
  "requirements": {
    "secureContext": false,
    "workers": true,
    "indexedDb": false,
    "crossOriginIsolated": false,
    "topLevelContext": false
  },
  "privacy": {
    "processing": "local",
    "fileUploads": true,
    "telemetry": false,
    "label": "Inputs stay in this browser; nothing is uploaded."
  },
  "source": {
    "repository": "https://git.add-ideas.de/lotobo/epub-tools",
    "license": "GPL-3.0-or-later"
  },
  "actions": [
    {
      "id": "source",
      "label": "Source",
      "url": "https://git.add-ideas.de/lotobo/epub-tools"
    }
  ]
 }
@@ -0,0 +1,33 @@
 import { readFile, writeFile } from "node:fs/promises";
 import path from "node:path";
 import { fileURLToPath } from "node:url";
 import { format } from "prettier";
 const root = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "..");
 const sourcePath = path.join(root, "src/toolbox/manifest.source.json");
 const outputPath = path.join(root, "public/toolbox-app.json");
 const source = JSON.parse(await readFile(sourcePath, "utf8"));
 const pkg = JSON.parse(await readFile(path.join(root, "package.json"), "utf8"));
 const versionSource = await readFile(path.join(root, "src/version.ts"), "utf8");
 const appVersion = /^export const APP_VERSION = "([^"]+)";$/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");
 }
@@ -0,0 +1,165 @@
 #!/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 });
 }
@@ -0,0 +1,70 @@
 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");
@@ -0,0 +1,66 @@
 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/epub/";
 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"));
@@ -0,0 +1,35 @@
 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 EPUB Tools…
            </p>
          }
        >
          <Workbench />
        </Suspense>
      </AppShell>
      <HelpDialog open={helpOpen} onClose={() => setHelpOpen(false)} />
    </ErrorBoundary>
  );
 }
@@ -0,0 +1,27 @@
 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>EPUB Tools could not continue</h1>
          <p>{this.state.error.message}</p>
          <button type="button" onClick={() => location.reload()}>
            Reload
          </button>
        </main>
      );
    return this.props.children;
  }
 }
@@ -0,0 +1,41 @@
 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={onClose}
      aria-labelledby="help-title"
    >
      <div className="dialog-heading">
        <div>
          <p className="eyebrow">Local-first help</p>
          <h2 id="help-title">About EPUB Tools</h2>
        </div>
        <button type="button" onClick={onClose} aria-label="Close help">
          ×
        </button>
      </div>
      <p>Read, inspect and repair EPUB publications locally in the browser.</p>
      <p>
        All processing is performed in this browser. Imported data is treated as
        untrusted and bounded before parsing.
      </p>
    </dialog>
  );
 }
@@ -0,0 +1,732 @@
 import { useEffect, useMemo, useState } from "react";
 import {
  sanitizeDownloadFilename,
  triggerBlobDownload,
 } from "@add-ideas/toolbox-helpers";
 import { closeBook, openEpub, readEntryBytes } from "../epub/archive";
 import {
  downloadJson,
  exportPlainText,
  rebuildEpub,
  type MetadataPatch,
 } from "../epub/export";
 import { renderChapter, revokeRenderedChapter } from "../epub/reader";
 import type {
  EpubBook,
  ManifestItem,
  NavigationItem,
  RenderedChapter,
 } from "../epub/types";
 type View = "reader" | "metadata" | "validation" | "package" | "export";
 const views: ReadonlyArray<readonly [View, string]> = [
  ["reader", "Reader"],
  ["metadata", "Metadata"],
  ["validation", "Validation"],
  ["package", "Package tree"],
  ["export", "Export & rebuild"],
 ];
 function initialMetadata(book: EpubBook): MetadataPatch {
  return {
    ...book.package.metadata,
    creators: [...book.package.metadata.creators],
    subjects: [...book.package.metadata.subjects],
  };
 }
 function formatBytes(value: number): string {
  if (value < 1024) return `${value} B`;
  const units = ["KiB", "MiB", "GiB"];
  let scaled = value / 1024;
  let unit = 0;
  while (scaled >= 1024 && unit < units.length - 1) {
    scaled /= 1024;
    unit += 1;
  }
  return `${scaled.toFixed(scaled < 10 ? 1 : 0)} ${units[unit]}`;
 }
 function flatten(items: NavigationItem[]): NavigationItem[] {
  return items.flatMap((item) => [item, ...flatten(item.children)]);
 }
 function EmptyState({ onFile }: { onFile: (file: File) => void }) {
  return (
    <section className="drop panel">
      <div className="book-mark" aria-hidden="true">
        EPUB
      </div>
      <div>
        <p className="eyebrow">Open a local publication</p>
        <h2>Inspect and read without uploading</h2>
        <p>
          Select an EPUB 2 or EPUB 3 file. Package parsing, validation, chapter
          rendering, metadata editing, and rebuilding stay in this browser.
        </p>
        <label className="button primary">
          Choose EPUB
          <input
            type="file"
            accept=".epub,application/epub+zip"
            onChange={(event) => {
              const file = event.target.files?.[0];
              if (file) onFile(file);
              event.currentTarget.value = "";
            }}
          />
        </label>
      </div>
    </section>
  );
 }
 function Summary({ book }: { book: EpubBook }) {
  const errors = book.issues.filter((item) => item.severity === "error").length;
  const warnings = book.issues.filter(
    (item) => item.severity === "warning",
  ).length;
  return (
    <section className="summary-grid">
      <article>
        <span>Title</span>
        <strong>{book.package.metadata.title || "Untitled"}</strong>
        <small>
          {book.package.metadata.creators.join(", ") || "Unknown creator"}
        </small>
      </article>
      <article>
        <span>Format</span>
        <strong>EPUB {book.package.version || "unknown"}</strong>
        <small>
          {book.package.spine.length} spine items ·{" "}
          {book.package.manifest.length} manifest items
        </small>
      </article>
      <article>
        <span>Container</span>
        <strong>{formatBytes(book.summary.fileSize)}</strong>
        <small>
          {book.summary.entryCount} entries ·{" "}
          {formatBytes(book.summary.uncompressedBytes)} expanded
        </small>
      </article>
      <article className={errors ? "bad" : warnings ? "warn" : "good"}>
        <span>Validation</span>
        <strong>
          {errors} errors · {warnings} warnings
        </strong>
        <small>
          {book.summary.encryptedResources
            ? "Encryption metadata detected"
            : "No encryption metadata detected"}
        </small>
      </article>
    </section>
  );
 }
 function ReaderView({
  book,
  chapter,
  busy,
  error,
  onOpen,
 }: {
  book: EpubBook;
  chapter?: RenderedChapter;
  busy: boolean;
  error: string;
  onOpen: (item: ManifestItem) => void;
 }) {
  const navigation = useMemo(() => flatten(book.package.navigation), [book]);
  const spine = book.package.spine.filter((item) => item.item && item.linear);
  return (
    <section className="reader-layout">
      <aside className="panel chapter-list">
        <div>
          <p className="eyebrow">Reading order</p>
          <h2>Contents</h2>
        </div>
        {spine.map((spineItem, index) => {
          const item = spineItem.item!;
          const label =
            navigation.find((entry) => entry.path === item.path)?.label ||
            item.id ||
            `Chapter ${index + 1}`;
          return (
            <button
              type="button"
              className={chapter?.path === item.path ? "active" : ""}
              key={`${item.id}-${index}`}
              onClick={() => onOpen(item)}
            >
              <span>{index + 1}</span>
              {label}
            </button>
          );
        })}
      </aside>
      <section className="panel page-reader">
        <div className="panel-heading">
          <div>
            <p className="eyebrow">Sandboxed, script-free preview</p>
            <h2>
              {chapter?.title ??
                (busy ? "Preparing chapter…" : "Choose a chapter")}
            </h2>
          </div>
          {chapter && (
            <button
              type="button"
              onClick={() =>
                triggerBlobDownload(
                  new Blob([chapter.html], { type: "application/xhtml+xml" }),
                  sanitizeDownloadFilename(
                    `${chapter.title}.xhtml`,
                    "chapter.xhtml",
                  ),
                )
              }
            >
              Export sanitized chapter
            </button>
          )}
        </div>
        {error && (
          <p className="error" role="alert">
            {error}
          </p>
        )}
        {chapter ? (
          <iframe
            sandbox=""
            title={`Safe EPUB preview: ${chapter.title}`}
            srcDoc={chapter.html}
          />
        ) : (
          <p className="empty">
            {busy
              ? "Sanitizing the chapter and resolving local images…"
              : "Choose an item from the reading order."}
          </p>
        )}
        <p className="notice">
          Scripts, forms, frames, embedded objects, external resources,
          navigation, stylesheet links, and CSS URLs are blocked or removed.
          Inline publisher styling may remain after URL stripping; the reader
          adds a responsive fallback stylesheet.
        </p>
      </section>
    </section>
  );
 }
 function MetadataView({
  draft,
  setDraft,
 }: {
  draft: MetadataPatch;
  setDraft: (value: MetadataPatch) => void;
 }) {
  const field = (
    key: keyof Omit<MetadataPatch, "creators" | "subjects">,
    label: string,
    multiline = false,
  ) => (
    <label className="field">
      <span>{label}</span>
      {multiline ? (
        <textarea
          value={String(draft[key])}
          onChange={(event) =>
            setDraft({ ...draft, [key]: event.target.value })
          }
        />
      ) : (
        <input
          value={String(draft[key])}
          onChange={(event) =>
            setDraft({ ...draft, [key]: event.target.value })
          }
        />
      )}
    </label>
  );
  return (
    <section className="panel workspace">
      <p className="eyebrow">Editable Dublin Core fields</p>
      <h2>Publication metadata</h2>
      <div className="form-grid">
        {field("title", "Title")}
        {field("language", "Language")}
        {field("identifier", "Identifier")}
        {field("publisher", "Publisher")}
        {field("date", "Date")}
        {field("rights", "Rights")}
      </div>
      <label className="field">
        <span>Creators (one per line)</span>
        <textarea
          value={draft.creators.join("\n")}
          onChange={(event) =>
            setDraft({ ...draft, creators: event.target.value.split(/\r?\n/u) })
          }
        />
      </label>
      <label className="field">
        <span>Subjects (one per line)</span>
        <textarea
          value={draft.subjects.join("\n")}
          onChange={(event) =>
            setDraft({ ...draft, subjects: event.target.value.split(/\r?\n/u) })
          }
        />
      </label>
      {field("description", "Description", true)}
      <p className="notice">
        Edits remain staged until you create a rebuilt EPUB. The original File
        object is never modified.
      </p>
    </section>
  );
 }
 function ValidationView({ book }: { book: EpubBook }) {
  const grouped = (["error", "warning", "info"] as const).map(
    (severity) =>
      [
        severity,
        book.issues.filter((item) => item.severity === severity),
      ] as const,
  );
  return (
    <section className="panel workspace">
      <div className="panel-heading">
        <div>
          <p className="eyebrow">Bounded structural and link checks</p>
          <h2>Validation report</h2>
        </div>
        <button
          type="button"
          onClick={() =>
            downloadJson(
              {
                schemaVersion: 1,
                generatedBy: "add-ideas EPUB Tools 0.1.0",
                file: book.summary,
                package: book.package,
                issues: book.issues,
              },
              "epub-validation-report.json",
            )
          }
        >
          Download JSON report
        </button>
      </div>
      {grouped.map(([severity, issues]) => (
        <section key={severity} className="issue-group">
          <h3>
            {severity} ({issues.length})
          </h3>
          {issues.length ? (
            issues.map((item, index) => (
              <article
                className={`issue ${severity}`}
                key={`${item.code}-${index}`}
              >
                <strong>{item.code}</strong>
                <span>{item.message}</span>
                {item.path && <code>{item.path}</code>}
              </article>
            ))
          ) : (
            <p className="muted">None.</p>
          )}
        </section>
      ))}
      <p className="notice">
        This is a focused in-browser preflight, not a claim of complete
        EPUBCheck conformance. It does not validate CSS grammar, media overlays,
        accessibility semantics, signatures, font licences, or every schema
        constraint.
      </p>
    </section>
  );
 }
 function PackageView({ book }: { book: EpubBook }) {
  const mediaByPath = new Map(
    book.package.manifest.map((item) => [item.path, item.mediaType]),
  );
  return (
    <section className="panel workspace">
      <div className="panel-heading">
        <div>
          <p className="eyebrow">ZIP package inventory</p>
          <h2>{book.summary.entryCount} entries</h2>
        </div>
        <button
          type="button"
          onClick={() =>
            downloadJson(
              {
                file: book.summary.filename,
                packagePath: book.package.packagePath,
                entries: book.entries.map((entry) => ({
                  path: entry.filename,
                  directory: entry.directory,
                  compressedSize: entry.compressedSize,
                  uncompressedSize: entry.uncompressedSize,
                  encrypted: entry.encrypted,
                  mediaType: mediaByPath.get(entry.filename),
                })),
              },
              "epub-package-tree.json",
            )
          }
        >
          Export inventory
        </button>
      </div>
      <div className="table-scroll">
        <table>
          <thead>
            <tr>
              <th>Path</th>
              <th>Type</th>
              <th>Compressed</th>
              <th>Expanded</th>
            </tr>
          </thead>
          <tbody>
            {book.entries.map((entry) => (
              <tr key={`${entry.filename}-${entry.offset}`}>
                <td>
                  <code>{entry.filename}</code>
                </td>
                <td>
                  {entry.directory
                    ? "directory"
                    : (mediaByPath.get(entry.filename) ?? "unmanifested")}
                </td>
                <td>{formatBytes(entry.compressedSize)}</td>
                <td>{formatBytes(entry.uncompressedSize)}</td>
              </tr>
            ))}
          </tbody>
        </table>
      </div>
    </section>
  );
 }
 function ExportView({ book, draft }: { book: EpubBook; draft: MetadataPatch }) {
  const [cover, setCover] = useState<File>();
  const [normalize, setNormalize] = useState(true);
  const [busy, setBusy] = useState(false);
  const [status, setStatus] = useState("");
  const [error, setError] = useState("");
  const rebuild = async () => {
    setBusy(true);
    setError("");
    try {
      const result = await rebuildEpub(
        book,
        { metadata: draft, cover, normalizeTimestamps: normalize },
        setStatus,
      );
      triggerBlobDownload(
        result.blob,
        sanitizeDownloadFilename(
          book.file.name.replace(/\.epub$/iu, "-updated.epub"),
          "updated.epub",
        ),
      );
      setStatus(`Ready: ${result.changes.join("; ")}`);
    } catch (reason) {
      setError(reason instanceof Error ? reason.message : "Rebuild failed.");
    } finally {
      setBusy(false);
    }
  };
  const exportCover = async () => {
    if (!book.package.cover) return;
    try {
      const bytes = await readEntryBytes(
        book,
        book.package.cover.path,
        25 * 1024 * 1024,
      );
      triggerBlobDownload(
        new Blob([bytes as BlobPart], { type: book.package.cover.mediaType }),
        sanitizeDownloadFilename(book.package.cover.href, "cover"),
      );
    } catch (reason) {
      setError(
        reason instanceof Error ? reason.message : "Cover export failed.",
      );
    }
  };
  const plainText = async () => {
    setBusy(true);
    try {
      triggerBlobDownload(
        await exportPlainText(book),
        sanitizeDownloadFilename(
          `${draft.title || "publication"}.txt`,
          "publication.txt",
        ),
      );
    } catch (reason) {
      setError(
        reason instanceof Error ? reason.message : "Text export failed.",
      );
    } finally {
      setBusy(false);
    }
  };
  return (
    <section className="panel workspace">
      <p className="eyebrow">Fresh deterministic container</p>
      <h2>Export and rebuild</h2>
      <div className="export-grid">
        <article>
          <h3>Portable reports</h3>
          <p>
            Export parsed metadata, structure, and validation without changing
            the book.
          </p>
          <div className="actions">
            <button
              type="button"
              onClick={() =>
                downloadJson(
                  {
                    schemaVersion: 1,
                    metadata: draft,
                    packageVersion: book.package.version,
                    packagePath: book.package.packagePath,
                  },
                  "epub-metadata.json",
                )
              }
            >
              Metadata JSON
            </button>
            <button
              type="button"
              disabled={busy}
              onClick={() => void plainText()}
            >
              Reading-order text
            </button>
            {book.package.cover && (
              <button type="button" onClick={() => void exportCover()}>
                Original cover
              </button>
            )}
          </div>
        </article>
        <article>
          <h3>Updated EPUB</h3>
          <p>
            Write edited metadata, optionally replace the declared cover,
            normalize timestamps, and repair mimetype ordering/compression.
          </p>
          <label className="field">
            <span>
              Replacement cover{" "}
              {book.package.cover
                ? `(declared at ${book.package.cover.path})`
                : "(no cover item declared)"}
            </span>
            <input
              type="file"
              disabled={!book.package.cover}
              accept="image/jpeg,image/png,image/webp,image/svg+xml"
              onChange={(event) => setCover(event.target.files?.[0])}
            />
          </label>
          <label className="check">
            <input
              type="checkbox"
              checked={normalize}
              onChange={(event) => setNormalize(event.target.checked)}
            />{" "}
            Normalize entry timestamps to 1980-01-01 and sort paths
          </label>
          <button
            className="primary"
            type="button"
            disabled={busy || book.summary.encryptedResources}
            onClick={() => void rebuild()}
          >
            {busy ? "Rebuilding…" : "Create updated EPUB"}
          </button>
        </article>
      </div>
      {status && (
        <p className="success" role="status">
          {status}
        </p>
      )}
      {error && (
        <p className="error" role="alert">
          {error}
        </p>
      )}
      <p className="warning">
        A rebuild re-compresses entries and invalidates existing package
        signatures. It is disabled when encryption metadata exists. Replacement
        cover MIME metadata is updated, but the existing internal filename is
        retained and its extension can therefore differ.
      </p>
    </section>
  );
 }
 export function Workbench() {
  const [book, setBook] = useState<EpubBook>();
  const [view, setView] = useState<View>("reader");
  const [draft, setDraft] = useState<MetadataPatch>();
  const [chapter, setChapter] = useState<RenderedChapter>();
  const [busy, setBusy] = useState(false);
  const [chapterBusy, setChapterBusy] = useState(false);
  const [error, setError] = useState("");
  const [chapterError, setChapterError] = useState("");
  useEffect(
    () => () => {
      void closeBook(book);
    },
    [book],
  );
  useEffect(() => () => revokeRenderedChapter(chapter), [chapter]);
  const openChapter = async (item: ManifestItem, currentBook = book) => {
    if (!currentBook) return;
    setChapterBusy(true);
    setChapterError("");
    try {
      setChapter(await renderChapter(currentBook, item.path));
    } catch (reason) {
      setChapterError(
        reason instanceof Error ? reason.message : "Chapter rendering failed.",
      );
    } finally {
      setChapterBusy(false);
    }
  };
  const openFile = async (file: File) => {
    setBusy(true);
    setError("");
    setChapter(undefined);
    try {
      const opened = await openEpub(file);
      setBook(opened);
      setDraft(initialMetadata(opened));
      setView("reader");
      const first = opened.package.spine.find(
        (item) => item.linear && item.item,
      )?.item;
      if (first) await openChapter(first, opened);
    } catch (reason) {
      setError(
        reason instanceof Error ? reason.message : "Unable to open EPUB.",
      );
    } finally {
      setBusy(false);
    }
  };
  const content =
    book && draft ? (
      view === "reader" ? (
        <ReaderView
          book={book}
          chapter={chapter}
          busy={chapterBusy}
          error={chapterError}
          onOpen={(item) => void openChapter(item)}
        />
      ) : view === "metadata" ? (
        <MetadataView draft={draft} setDraft={setDraft} />
      ) : view === "validation" ? (
        <ValidationView book={book} />
      ) : view === "package" ? (
        <PackageView book={book} />
      ) : (
        <ExportView book={book} draft={draft} />
      )
    ) : null;
  return (
    <main className="workbench">
      <header className="hero">
        <div>
          <p className="eyebrow">Local publication workbench</p>
          <h1>EPUB Tools</h1>
          <p>
            Read safely, inspect the package, validate links and structure, edit
            metadata and covers, and create a normalized EPUB without uploading
            the book.
          </p>
        </div>
        <span className="privacy-pill">Sandboxed reader · local files</span>
      </header>
      {error && (
        <p className="error" role="alert">
          {error}
        </p>
      )}
      {busy && (
        <p className="panel loading" role="status">
          Opening and validating the bounded publication…
        </p>
      )}
      {!book && !busy ? (
        <EmptyState onFile={(file) => void openFile(file)} />
      ) : (
        book && (
          <>
            <div className="file-bar panel">
              <div>
                <strong>{book.file.name}</strong>
                <span>
                  {book.package.metadata.title || "Untitled publication"}
                </span>
              </div>
              <label className="button">
                Open another
                <input
                  type="file"
                  accept=".epub,application/epub+zip"
                  onChange={(event) => {
                    const file = event.target.files?.[0];
                    if (file) void openFile(file);
                    event.currentTarget.value = "";
                  }}
                />
              </label>
            </div>
            <Summary book={book} />
            <nav
              className="panel workspace-tabs"
              role="tablist"
              aria-label="EPUB workspaces"
            >
              {views.map(([value, label]) => (
                <button
                  type="button"
                  role="tab"
                  aria-selected={view === value}
                  key={value}
                  onClick={() => setView(value)}
                >
                  {label}
                </button>
              ))}
            </nav>
            {content}
          </>
        )
      )}
    </main>
  );
 }
@@ -0,0 +1,172 @@
 import {
  BlobReader,
  Uint8ArrayWriter,
  ZipReader,
  type Entry,
 } from "@zip.js/zip.js";
 import { EPUB_LIMITS, readEntryText } from "./entries";
 import {
  parseNavigationDocument,
  parseNcxDocument,
  parsePackageDocument,
 } from "./package";
 import { validateEntryPath } from "./paths";
 import type { EpubBook, EpubIssue } from "./types";
 import { elementsByLocalName, parseXml } from "./xml";
 import { validatePublication } from "./validation";
 export { EPUB_LIMITS, readEntryBytes, readEntryText } from "./entries";
 export async function closeBook(book: EpubBook | undefined): Promise<void> {
  if (book) await book.reader.close();
 }
 export async function openEpub(file: File): Promise<EpubBook> {
  if (file.size === 0 || file.size > EPUB_LIMITS.fileBytes)
    throw new RangeError("EPUB must be between 1 byte and 512 MiB.");
  const reader = new ZipReader(new BlobReader(file), {
    useWebWorkers: true,
    strictness: "strict",
  });
  try {
    const entries = await reader.getEntries();
    if (!entries.length || entries.length > EPUB_LIMITS.entries)
      throw new RangeError(
        `EPUB entry count must be between 1 and ${EPUB_LIMITS.entries.toLocaleString()}.`,
      );
    let totalUncompressed = 0;
    let compressedBytes = 0;
    const entryByPath = new Map<string, Entry>();
    for (const entry of entries) {
      validateEntryPath(entry.filename.replace(/\/$/u, "") || entry.filename);
      if (entryByPath.has(entry.filename))
        throw new Error(`Duplicate archive path: ${entry.filename}`);
      entryByPath.set(entry.filename, entry);
      if (!entry.directory) {
        totalUncompressed += entry.uncompressedSize;
        compressedBytes += entry.compressedSize;
        if (entry.uncompressedSize > EPUB_LIMITS.resourceBytes)
          throw new RangeError(
            `${entry.filename} exceeds the 64 MiB per-resource limit.`,
          );
        if (
          entry.compressedSize === 0
            ? entry.uncompressedSize > 0
            : entry.uncompressedSize / entry.compressedSize >
              EPUB_LIMITS.expansionRatio
        )
          throw new RangeError(
            `${entry.filename} exceeds the ${EPUB_LIMITS.expansionRatio}:1 expansion-ratio limit.`,
          );
      }
    }
    if (totalUncompressed > EPUB_LIMITS.totalUncompressedBytes)
      throw new RangeError("EPUB exceeds the 1 GiB total uncompressed limit.");
    const mimetypeEntry = entryByPath.get("mimetype");
    if (!mimetypeEntry || mimetypeEntry.directory)
      throw new Error("The EPUB has no root mimetype file.");
    const mimetype = new TextDecoder("utf-8", { fatal: true }).decode(
      await mimetypeEntry.getData(new Uint8ArrayWriter(), {
        checkSignature: true,
      }),
    );
    if (mimetype !== "application/epub+zip")
      throw new Error(
        "The root mimetype entry is not exactly application/epub+zip.",
      );
    const physicalFiles = entries
      .filter((entry) => !entry.directory)
      .toSorted((left, right) => left.offset - right.offset);
    const mimetypeFirst = physicalFiles[0]?.filename === "mimetype";
    const mimetypeStored = mimetypeEntry.compressionMethod === 0;
    const provisional = { entryByPath };
    const containerXml = await readEntryText(
      provisional,
      "META-INF/container.xml",
      EPUB_LIMITS.xmlBytes,
    );
    const container = parseXml(containerXml, "META-INF/container.xml");
    const rootfiles = elementsByLocalName(container, "rootfile")
      .map((element) => element.getAttribute("full-path") ?? "")
      .filter(Boolean);
    if (!rootfiles.length)
      throw new Error("container.xml does not declare a package rootfile.");
    const packagePath = validateEntryPath(rootfiles[0] ?? "");
    const packageXml = await readEntryText(
      provisional,
      packagePath,
      EPUB_LIMITS.xmlBytes,
    );
    const parsed = parsePackageDocument(packageXml, packagePath);
    const issues: EpubIssue[] = [];
    if (rootfiles.length > 1)
      issues.push({
        severity: "info",
        code: "multiple-renditions",
        message: `${rootfiles.length} package rootfiles are present; version 0.1 opens the first rendition.`,
        path: "META-INF/container.xml",
      });
    const book: EpubBook = {
      file,
      reader,
      entries,
      entryByPath,
      package: parsed.package,
      packageXml,
      issues,
      summary: {
        filename: file.name,
        fileSize: file.size,
        entryCount: entries.length,
        compressedBytes,
        uncompressedBytes: totalUncompressed,
        mimetypeFirst,
        mimetypeStored,
        encryptedResources:
          entries.some((entry) => entry.encrypted) ||
          entryByPath.has("META-INF/encryption.xml"),
      },
    };
    if (book.package.nav?.path && entryByPath.has(book.package.nav.path)) {
      try {
        book.package.navigation = parseNavigationDocument(
          await readEntryText(book, book.package.nav.path),
          book.package.nav.path,
        );
      } catch (reason) {
        issues.push({
          severity: "error",
          code: "invalid-navigation",
          message:
            reason instanceof Error
              ? reason.message
              : "Navigation parsing failed.",
          path: book.package.nav.path,
        });
      }
    } else if (
      book.package.ncx?.path &&
      entryByPath.has(book.package.ncx.path)
    ) {
      try {
        book.package.navigation = parseNcxDocument(
          await readEntryText(book, book.package.ncx.path),
          book.package.ncx.path,
        );
      } catch (reason) {
        issues.push({
          severity: "error",
          code: "invalid-ncx",
          message:
            reason instanceof Error ? reason.message : "NCX parsing failed.",
          path: book.package.ncx.path,
        });
      }
    }
    issues.push(...(await validatePublication(book)));
    return book;
  } catch (reason) {
    await reader.close().catch(() => undefined);
    throw reason;
  }
 }
@@ -0,0 +1,41 @@
 import { Uint8ArrayWriter } from "@zip.js/zip.js";
 import { decodeXml } from "./xml";
 import type { EpubBook } from "./types";
 export const EPUB_LIMITS = {
  fileBytes: 512 * 1024 * 1024,
  entries: 20_000,
  totalUncompressedBytes: 1024 * 1024 * 1024,
  expansionRatio: 500,
  xmlBytes: 16 * 1024 * 1024,
  chapterBytes: 16 * 1024 * 1024,
  resourceBytes: 64 * 1024 * 1024,
 };
 export async function readEntryBytes(
  book: Pick<EpubBook, "entryByPath">,
  path: string,
  maximum = EPUB_LIMITS.resourceBytes,
 ): Promise<Uint8Array> {
  const entry = book.entryByPath.get(path);
  if (!entry || entry.directory)
    throw new Error(`EPUB entry is missing: ${path}`);
  if (entry.encrypted)
    throw new Error(`ZIP-encrypted entry is unsupported: ${path}`);
  if (entry.uncompressedSize > maximum)
    throw new RangeError(
      `${path} exceeds the ${Math.round(maximum / 1024 / 1024)} MiB extraction limit.`,
    );
  return entry.getData(new Uint8ArrayWriter(), {
    checkSignature: true,
    useWebWorkers: true,
  });
 }
 export async function readEntryText(
  book: Pick<EpubBook, "entryByPath">,
  path: string,
  maximum = EPUB_LIMITS.chapterBytes,
 ): Promise<string> {
  return decodeXml(await readEntryBytes(book, path, maximum));
 }
@@ -0,0 +1,181 @@
 import { BlobReader, BlobWriter, TextReader, ZipWriter } from "@zip.js/zip.js";
 import { triggerBlobDownload } from "@add-ideas/toolbox-helpers";
 import { readEntryText } from "./entries";
 import type { EpubBook, EpubMetadata } from "./types";
 import { elementsByLocalName, parseXml } from "./xml";
 export interface MetadataPatch extends Omit<
  EpubMetadata,
  "creators" | "subjects"
 > {
  creators: string[];
  subjects: string[];
 }
 export interface RebuildOptions {
  metadata: MetadataPatch;
  cover?: File;
  normalizeTimestamps?: boolean;
 }
 const DC_NAMESPACE = "http://purl.org/dc/elements/1.1/";
 function setMetadataValues(
  document: XMLDocument,
  metadataElement: Element,
  localName: string,
  values: string[],
 ): void {
  for (const element of elementsByLocalName(metadataElement, localName))
    element.remove();
  for (const value of values.map((item) => item.trim()).filter(Boolean)) {
    const element = document.createElementNS(DC_NAMESPACE, `dc:${localName}`);
    element.textContent = value;
    metadataElement.append(element);
  }
 }
 export function patchPackageMetadata(
  packageXml: string,
  metadata: MetadataPatch,
  coverMediaType?: string,
  coverId?: string,
 ): string {
  const document = parseXml(packageXml, "package document");
  const metadataElement = elementsByLocalName(
    document.documentElement,
    "metadata",
  )[0];
  if (!metadataElement) throw new Error("Package metadata element is missing.");
  setMetadataValues(document, metadataElement, "title", [metadata.title]);
  setMetadataValues(document, metadataElement, "creator", metadata.creators);
  setMetadataValues(document, metadataElement, "language", [metadata.language]);
  setMetadataValues(document, metadataElement, "identifier", [
    metadata.identifier,
  ]);
  setMetadataValues(document, metadataElement, "publisher", [
    metadata.publisher,
  ]);
  setMetadataValues(document, metadataElement, "date", [metadata.date]);
  setMetadataValues(document, metadataElement, "description", [
    metadata.description,
  ]);
  setMetadataValues(document, metadataElement, "rights", [metadata.rights]);
  setMetadataValues(document, metadataElement, "subject", metadata.subjects);
  if (coverMediaType && coverId) {
    const coverItem = elementsByLocalName(
      document.documentElement,
      "item",
    ).find((item) => item.getAttribute("id") === coverId);
    coverItem?.setAttribute("media-type", coverMediaType);
  }
  const serialized = new XMLSerializer().serializeToString(document);
  return serialized.startsWith("<?xml")
    ? serialized
    : `<?xml version="1.0" encoding="UTF-8"?>\n${serialized}`;
 }
 function coverType(file: File): string {
  if (
    ["image/jpeg", "image/png", "image/webp", "image/svg+xml"].includes(
      file.type,
    )
  )
    return file.type;
  throw new Error(
    "Replacement cover must be JPEG, PNG, WebP, or SVG with an explicit browser MIME type.",
  );
 }
 export async function rebuildEpub(
  book: EpubBook,
  options: RebuildOptions,
  onProgress?: (message: string) => void,
 ): Promise<{ blob: Blob; changes: string[]; packageXml: string }> {
  if (book.summary.encryptedResources)
    throw new Error(
      "Rebuilding is disabled when encryption or DRM metadata is present; copying may invalidate protection or obfuscation metadata.",
    );
  if (options.cover && !book.package.cover)
    throw new Error("This publication has no declared cover item to replace.");
  const replacementType = options.cover ? coverType(options.cover) : undefined;
  const packageXml = patchPackageMetadata(
    book.packageXml,
    options.metadata,
    replacementType,
    book.package.cover?.id,
  );
  const writer = new ZipWriter(new BlobWriter("application/epub+zip"));
  const fixedDate = new Date("1980-01-01T00:00:00.000Z");
  const changes = [
    "Rewrote package metadata",
    "Placed an uncompressed mimetype entry first",
  ];
  await writer.add("mimetype", new TextReader("application/epub+zip"), {
    level: 0,
    lastModDate: options.normalizeTimestamps ? fixedDate : undefined,
  });
  const entries = book.entries
    .filter((entry) => !entry.directory && entry.filename !== "mimetype")
    .toSorted((left, right) => left.filename.localeCompare(right.filename));
  for (const [index, entry] of entries.entries()) {
    if (entry.directory) continue;
    onProgress?.(`Writing ${index + 1} / ${entries.length}: ${entry.filename}`);
    const lastModDate = options.normalizeTimestamps
      ? fixedDate
      : entry.lastModDate;
    if (entry.filename === book.package.packagePath)
      await writer.add(entry.filename, new TextReader(packageXml), {
        level: 6,
        lastModDate,
      });
    else if (options.cover && entry.filename === book.package.cover?.path) {
      await writer.add(entry.filename, new BlobReader(options.cover), {
        level: 6,
        lastModDate,
      });
      changes.push(`Replaced cover bytes at ${entry.filename}`);
    } else {
      const blob = await entry.getData(new BlobWriter(), {
        checkSignature: true,
        useWebWorkers: true,
      });
      await writer.add(entry.filename, new BlobReader(blob), {
        level: entry.compressionMethod === 0 ? 0 : 6,
        lastModDate,
      });
    }
  }
  const blob = await writer.close();
  return { blob, changes, packageXml };
 }
 export function downloadJson(value: unknown, filename: string): void {
  triggerBlobDownload(
    new Blob([JSON.stringify(value, null, 2)], { type: "application/json" }),
    filename,
  );
 }
 export async function exportPlainText(book: EpubBook): Promise<Blob> {
  const sections: string[] = [];
  let total = 0;
  for (const spine of book.package.spine) {
    if (!spine.item || !/xhtml|html/iu.test(spine.item.mediaType)) continue;
    const source = await readEntryText(book, spine.item.path, 4 * 1024 * 1024);
    const document = new DOMParser().parseFromString(source, "text/html");
    document
      .querySelectorAll("script, style, iframe, object, embed")
      .forEach((element) => element.remove());
    const value = (document.body.textContent ?? "")
      .replace(/[ \t]+/gu, " ")
      .replace(/\n{3,}/gu, "\n\n")
      .trim();
    total += value.length;
    if (total > 32 * 1024 * 1024)
      throw new RangeError("Plain-text export exceeds the 32 MiB text limit.");
    sections.push(`# ${spine.item.id}\n\n${value}`);
  }
  return new Blob([sections.join("\n\n")], {
    type: "text/plain;charset=utf-8",
  });
 }
@@ -0,0 +1,181 @@
 import type {
  EpubMetadata,
  EpubPackage,
  ManifestItem,
  NavigationItem,
  SpineItem,
 } from "./types";
 import { directoryOf, resolvePackageHref, splitReference } from "./paths";
 import {
  directChildrenByLocalName,
  elementsByLocalName,
  parseXml,
 } from "./xml";
 function text(element: Element | undefined): string {
  return element?.textContent?.trim() ?? "";
 }
 function firstDirect(parent: Element, name: string): Element | undefined {
  return directChildrenByLocalName(parent, name)[0];
 }
 export function parsePackageDocument(
  packageXml: string,
  packagePath: string,
 ): { package: EpubPackage; document: XMLDocument } {
  const document = parseXml(packageXml, packagePath);
  const root = document.documentElement;
  if (root.localName !== "package")
    throw new Error("The rootfile is not an EPUB package document.");
  const metadataElement = firstDirect(root, "metadata");
  const manifestElement = firstDirect(root, "manifest");
  const spineElement = firstDirect(root, "spine");
  if (!metadataElement || !manifestElement || !spineElement)
    throw new Error(
      "The package document must contain metadata, manifest, and spine elements.",
    );
  const metadata: EpubMetadata = {
    title: text(elementsByLocalName(metadataElement, "title")[0]),
    creators: elementsByLocalName(metadataElement, "creator")
      .map((item) => text(item))
      .filter(Boolean),
    language: text(elementsByLocalName(metadataElement, "language")[0]),
    identifier: text(elementsByLocalName(metadataElement, "identifier")[0]),
    publisher: text(elementsByLocalName(metadataElement, "publisher")[0]),
    date: text(elementsByLocalName(metadataElement, "date")[0]),
    description: text(elementsByLocalName(metadataElement, "description")[0]),
    rights: text(elementsByLocalName(metadataElement, "rights")[0]),
    subjects: elementsByLocalName(metadataElement, "subject")
      .map((item) => text(item))
      .filter(Boolean),
  };
  const packageDirectory = directoryOf(packagePath);
  const manifest: ManifestItem[] = directChildrenByLocalName(
    manifestElement,
    "item",
  ).map((element) => {
    const href = element.getAttribute("href") ?? "";
    return {
      id: element.getAttribute("id") ?? "",
      href,
      path: resolvePackageHref(packagePath, href) ?? "",
      mediaType: element.getAttribute("media-type") ?? "",
      properties: (element.getAttribute("properties") ?? "")
        .split(/\s+/u)
        .filter(Boolean),
      fallback: element.getAttribute("fallback") ?? undefined,
      mediaOverlay: element.getAttribute("media-overlay") ?? undefined,
    };
  });
  const byId = new Map(manifest.map((item) => [item.id, item]));
  const spine: SpineItem[] = directChildrenByLocalName(
    spineElement,
    "itemref",
  ).map((element) => {
    const idref = element.getAttribute("idref") ?? "";
    return {
      idref,
      linear: element.getAttribute("linear") !== "no",
      properties: (element.getAttribute("properties") ?? "")
        .split(/\s+/u)
        .filter(Boolean),
      item: byId.get(idref),
    };
  });
  const coverId = elementsByLocalName(metadataElement, "meta")
    .find((element) => element.getAttribute("name") === "cover")
    ?.getAttribute("content");
  const cover =
    manifest.find((item) => item.properties.includes("cover-image")) ??
    (coverId ? byId.get(coverId) : undefined);
  const nav = manifest.find((item) => item.properties.includes("nav"));
  const ncxId = spineElement.getAttribute("toc") ?? undefined;
  const ncx =
    (ncxId ? byId.get(ncxId) : undefined) ??
    manifest.find((item) => item.mediaType === "application/x-dtbncx+xml");
  return {
    package: {
      version: root.getAttribute("version") ?? "",
      uniqueIdentifier: root.getAttribute("unique-identifier") ?? undefined,
      packagePath,
      packageDirectory,
      metadata,
      manifest,
      spine,
      navigation: [],
      cover,
      nav,
      ncx,
    },
    document,
  };
 }
 function navigationChildren(list: Element, basePath: string): NavigationItem[] {
  return directChildrenByLocalName(list, "li").map((item) => {
    const anchor = directChildrenByLocalName(item, "a")[0];
    const labelNode = anchor ?? directChildrenByLocalName(item, "span")[0];
    const href = anchor?.getAttribute("href") ?? "";
    const nested = directChildrenByLocalName(item, "ol")[0];
    let path: string | undefined;
    try {
      path = href ? resolvePackageHref(basePath, href) : undefined;
    } catch {
      path = undefined;
    }
    return {
      label: text(labelNode) || "Untitled",
      href,
      path,
      fragment: splitReference(href).fragment || undefined,
      children: nested ? navigationChildren(nested, basePath) : [],
    };
  });
 }
 export function parseNavigationDocument(
  xml: string,
  path: string,
 ): NavigationItem[] {
  const document = parseXml(xml, path);
  const navs = elementsByLocalName(document, "nav");
  const toc =
    navs.find((element) =>
      (
        element.getAttribute("epub:type") ??
        element.getAttributeNS("http://www.idpf.org/2007/ops", "type") ??
        ""
      )
        .split(/\s+/u)
        .includes("toc"),
    ) ?? navs[0];
  if (!toc) return [];
  const list = elementsByLocalName(toc, "ol")[0];
  return list ? navigationChildren(list, path) : [];
 }
 export function parseNcxDocument(xml: string, path: string): NavigationItem[] {
  const document = parseXml(xml, path);
  const navMap = elementsByLocalName(document, "navMap")[0];
  if (!navMap) return [];
  const parsePoints = (parent: Element): NavigationItem[] =>
    directChildrenByLocalName(parent, "navPoint").map((point) => {
      const label = text(elementsByLocalName(point, "text")[0]) || "Untitled";
      const href =
        elementsByLocalName(point, "content")[0]?.getAttribute("src") ?? "";
      let target: string | undefined;
      try {
        target = href ? resolvePackageHref(path, href) : undefined;
      } catch {
        target = undefined;
      }
      return {
        label,
        href,
        path: target,
        fragment: splitReference(href).fragment || undefined,
        children: parsePoints(point),
      };
    });
  return parsePoints(navMap);
 }
@@ -0,0 +1,67 @@
 export function isExternalReference(value: string): boolean {
  return /^(?:[a-z][a-z0-9+.-]*:|\/\/)/iu.test(value.trim());
 }
 export function validateEntryPath(input: string): string {
  if (
    !input ||
    input.includes("\0") ||
    input.includes("\\") ||
    input.startsWith("/") ||
    /^[A-Za-z]:/u.test(input)
  )
    throw new Error(`Unsafe archive path: ${input || "(empty)"}`);
  const parts = input.split("/");
  if (parts.some((part) => part === ".." || part === "."))
    throw new Error(`Archive path contains traversal segments: ${input}`);
  return input;
 }
 export function directoryOf(path: string): string {
  const index = path.lastIndexOf("/");
  return index < 0 ? "" : path.slice(0, index + 1);
 }
 export function splitReference(input: string): {
  pathname: string;
  fragment: string;
 } {
  const hash = input.indexOf("#");
  const query = input.indexOf("?");
  const end = Math.min(
    hash < 0 ? input.length : hash,
    query < 0 ? input.length : query,
  );
  return {
    pathname: input.slice(0, end),
    fragment: hash < 0 ? "" : input.slice(hash + 1),
  };
 }
 export function resolvePackageHref(
  basePath: string,
  href: string,
 ): string | undefined {
  const value = href.trim();
  if (!value || isExternalReference(value)) return undefined;
  const { pathname } = splitReference(value);
  let decoded: string;
  try {
    decoded = decodeURIComponent(pathname);
  } catch {
    throw new Error(`Invalid percent-encoding in href: ${href}`);
  }
  if (!decoded) return basePath;
  if (decoded.includes("\\") || decoded.startsWith("/"))
    throw new Error(`Unsafe absolute or backslash href: ${href}`);
  const stack = directoryOf(basePath).split("/").filter(Boolean);
  for (const part of decoded.split("/")) {
    if (!part || part === ".") continue;
    if (part === "..") {
      if (!stack.length)
        throw new Error(`Href escapes the EPUB package: ${href}`);
      stack.pop();
    } else stack.push(part);
  }
  return stack.join("/");
 }
@@ -0,0 +1,161 @@
 import DOMPurify from "dompurify";
 import { readEntryBytes, readEntryText } from "./entries";
 import { isExternalReference, resolvePackageHref } from "./paths";
 import type { EpubBook, NavigationItem, RenderedChapter } from "./types";
 const readerStyle = `
  :root { color-scheme: light dark; font-family: ui-serif, Georgia, serif; line-height: 1.62; }
  body { max-width: 48rem; margin: 0 auto; padding: 1.4rem; overflow-wrap: anywhere; }
  img, svg { max-width: 100%; height: auto; }
  table { max-width: 100%; border-collapse: collapse; overflow-wrap: anywhere; }
  th, td { padding: .3rem; border: 1px solid currentColor; }
  pre { max-width: 100%; overflow: auto; white-space: pre-wrap; }
  a { color: inherit; text-decoration: underline dotted; }
 `;
 function flattenNavigation(items: NavigationItem[]): NavigationItem[] {
  return items.flatMap((item) => [item, ...flattenNavigation(item.children)]);
 }
 function safeInlineStyle(value: string): string {
  return value
    .replace(/@import[^;]+;?/giu, "")
    .replace(/url\s*\([^)]*\)/giu, "none")
    .replace(/expression\s*\([^)]*\)/giu, "");
 }
 export async function renderChapter(
  book: EpubBook,
  path: string,
 ): Promise<RenderedChapter> {
  const item = book.package.manifest.find(
    (candidate) => candidate.path === path,
  );
  if (
    !item ||
    !/^(?:application\/xhtml\+xml|text\/html|image\/svg\+xml)$/iu.test(
      item.mediaType,
    )
  )
    throw new Error(
      "Only XHTML, HTML, and SVG spine documents can be rendered.",
    );
  const source = await readEntryText(book, path);
  const sanitized = DOMPurify.sanitize(source, {
    WHOLE_DOCUMENT: true,
    USE_PROFILES: { html: true, svg: true, svgFilters: false },
    FORBID_TAGS: [
      "script",
      "iframe",
      "object",
      "embed",
      "form",
      "input",
      "button",
      "textarea",
      "select",
      "base",
      "meta",
      "link",
    ],
    FORBID_ATTR: ["srcset", "formaction", "ping"],
  });
  const document = new DOMParser().parseFromString(
    String(sanitized),
    "text/html",
  );
  for (const element of [...document.querySelectorAll<HTMLElement>("[style]")])
    element.setAttribute(
      "style",
      safeInlineStyle(element.getAttribute("style") ?? ""),
    );
  for (const style of [...document.querySelectorAll("style")])
    style.textContent = safeInlineStyle(style.textContent ?? "");
  for (const anchor of [
    ...document.querySelectorAll<HTMLAnchorElement>("a[href]"),
  ]) {
    const original = anchor.getAttribute("href") ?? "";
    anchor.setAttribute("data-epub-href", original);
    anchor.setAttribute("href", "#");
    anchor.removeAttribute("target");
    anchor.title = original
      ? `EPUB link disabled in safe reader: ${original}`
      : "EPUB link";
  }
  const objectUrls: string[] = [];
  const resourceNodes: Array<{ element: Element; attribute: string }> = [
    ...[...document.querySelectorAll("img[src]")].map((element) => ({
      element,
      attribute: "src",
    })),
    ...[...document.querySelectorAll("svg image[href]")].map((element) => ({
      element,
      attribute: "href",
    })),
    ...[...document.querySelectorAll("svg image[xlink\\:href]")].map(
      (element) => ({ element, attribute: "xlink:href" }),
    ),
  ];
  for (const { element, attribute } of resourceNodes) {
    const reference = element.getAttribute(attribute) ?? "";
    if (
      !reference ||
      reference.startsWith("data:") ||
      isExternalReference(reference)
    ) {
      if (isExternalReference(reference)) element.removeAttribute(attribute);
      continue;
    }
    try {
      const target = resolvePackageHref(path, reference);
      const resource = target
        ? book.package.manifest.find((candidate) => candidate.path === target)
        : undefined;
      if (
        !target ||
        !resource ||
        !resource.mediaType.startsWith("image/") ||
        !book.entryByPath.has(target)
      ) {
        element.removeAttribute(attribute);
        continue;
      }
      const bytes = await readEntryBytes(book, target, 25 * 1024 * 1024);
      const url = URL.createObjectURL(
        new Blob([bytes as BlobPart], { type: resource.mediaType }),
      );
      objectUrls.push(url);
      element.setAttribute(attribute, url);
    } catch {
      element.removeAttribute(attribute);
    }
  }
  const csp = document.createElement("meta");
  csp.httpEquiv = "Content-Security-Policy";
  csp.content =
    "default-src 'none'; img-src data: blob:; style-src 'unsafe-inline'; font-src data: blob:; media-src blob: data:; form-action 'none'; base-uri 'none'";
  const style = document.createElement("style");
  style.textContent = readerStyle;
  document.head.prepend(csp, style);
  const title =
    document.title.trim() ||
    flattenNavigation(book.package.navigation).find(
      (entry) => entry.path === path,
    )?.label ||
    item.id ||
    path;
  const text = (document.body.textContent ?? "").replace(/\s+/gu, " ").trim();
  return {
    path,
    html: `<!doctype html>\n${document.documentElement.outerHTML}`,
    title,
    objectUrls,
    text,
  };
 }
 export function revokeRenderedChapter(
  chapter: RenderedChapter | undefined,
 ): void {
  for (const url of chapter?.objectUrls ?? []) URL.revokeObjectURL(url);
 }
@@ -0,0 +1,90 @@
 import type { Entry, ZipReader } from "@zip.js/zip.js";
 export type IssueSeverity = "error" | "warning" | "info";
 export interface EpubIssue {
  severity: IssueSeverity;
  code: string;
  message: string;
  path?: string;
 }
 export interface EpubMetadata {
  title: string;
  creators: string[];
  language: string;
  identifier: string;
  publisher: string;
  date: string;
  description: string;
  rights: string;
  subjects: string[];
 }
 export interface ManifestItem {
  id: string;
  href: string;
  path: string;
  mediaType: string;
  properties: string[];
  fallback?: string;
  mediaOverlay?: string;
 }
 export interface SpineItem {
  idref: string;
  linear: boolean;
  properties: string[];
  item?: ManifestItem;
 }
 export interface NavigationItem {
  label: string;
  href: string;
  path?: string;
  fragment?: string;
  children: NavigationItem[];
 }
 export interface EpubPackage {
  version: string;
  uniqueIdentifier?: string;
  packagePath: string;
  packageDirectory: string;
  metadata: EpubMetadata;
  manifest: ManifestItem[];
  spine: SpineItem[];
  navigation: NavigationItem[];
  cover?: ManifestItem;
  nav?: ManifestItem;
  ncx?: ManifestItem;
 }
 export interface EpubEntrySummary {
  path: string;
  compressedSize: number;
  uncompressedSize: number;
  mediaType?: string;
  directory: boolean;
 }
 export interface EpubBook {
  file: File;
  reader: ZipReader<Blob>;
  entries: Entry[];
  entryByPath: Map<string, Entry>;
  package: EpubPackage;
  packageXml: string;
  issues: EpubIssue[];
  summary: {
    filename: string;
    fileSize: number;
    entryCount: number;
    compressedBytes: number;
    uncompressedBytes: number;
    mimetypeFirst: boolean;
    mimetypeStored: boolean;
    encryptedResources: boolean;
  };
 }
 export interface RenderedChapter {
  path: string;
  html: string;
  title: string;
  objectUrls: string[];
  text: string;
 }
@@ -0,0 +1,340 @@
 import { readEntryText } from "./entries";
 import { isExternalReference, resolvePackageHref } from "./paths";
 import type { EpubBook, EpubIssue } from "./types";
 import { parseXml } from "./xml";
 function issue(
  severity: EpubIssue["severity"],
  code: string,
  message: string,
  path?: string,
 ): EpubIssue {
  return { severity, code, message, path };
 }
 export async function validatePublication(
  book: EpubBook,
 ): Promise<EpubIssue[]> {
  const result: EpubIssue[] = [];
  if (!book.summary.mimetypeFirst)
    result.push(
      issue(
        "warning",
        "mimetype-not-first",
        "The mimetype entry is not physically first; rebuilding can normalize this.",
        "mimetype",
      ),
    );
  if (!book.summary.mimetypeStored)
    result.push(
      issue(
        "warning",
        "mimetype-compressed",
        "The mimetype entry is compressed; EPUB requires it to be stored without compression.",
        "mimetype",
      ),
    );
  if (!book.entryByPath.has("META-INF/container.xml"))
    result.push(
      issue("error", "missing-container", "META-INF/container.xml is missing."),
    );
  if (!book.package.version)
    result.push(
      issue(
        "warning",
        "missing-version",
        "The package element has no EPUB version.",
        book.package.packagePath,
      ),
    );
  if (!book.package.metadata.title)
    result.push(
      issue(
        "error",
        "missing-title",
        "dc:title is missing or empty.",
        book.package.packagePath,
      ),
    );
  if (!book.package.metadata.identifier)
    result.push(
      issue(
        "error",
        "missing-identifier",
        "dc:identifier is missing or empty.",
        book.package.packagePath,
      ),
    );
  if (!book.package.metadata.language)
    result.push(
      issue(
        "error",
        "missing-language",
        "dc:language is missing or empty.",
        book.package.packagePath,
      ),
    );
  if (!book.package.spine.length)
    result.push(
      issue(
        "error",
        "empty-spine",
        "The publication spine is empty.",
        book.package.packagePath,
      ),
    );
  if (!book.package.nav && !book.package.ncx)
    result.push(
      issue(
        "warning",
        "missing-navigation",
        "No EPUB navigation document or NCX was declared.",
        book.package.packagePath,
      ),
    );
  if (!book.package.cover)
    result.push(
      issue(
        "info",
        "missing-cover",
        "No cover-image property or EPUB 2 cover metadata was found.",
        book.package.packagePath,
      ),
    );
  if (book.entryByPath.has("META-INF/encryption.xml"))
    result.push(
      issue(
        "warning",
        "encrypted-resources",
        "META-INF/encryption.xml is present. Font obfuscation may be valid; DRM-protected content is detected but not bypassed.",
        "META-INF/encryption.xml",
      ),
    );
  if (book.entryByPath.has("META-INF/signatures.xml"))
    result.push(
      issue(
        "info",
        "signatures-unverified",
        "Publication signatures are present but are not verified in v0.1.",
        "META-INF/signatures.xml",
      ),
    );
  const ids = new Set<string>();
  const manifestPaths = new Set<string>();
  for (const item of book.package.manifest) {
    if (!item.id)
      result.push(
        issue(
          "error",
          "manifest-id-missing",
          "A manifest item has no id.",
          book.package.packagePath,
        ),
      );
    else if (ids.has(item.id))
      result.push(
        issue(
          "error",
          "duplicate-manifest-id",
          `Duplicate manifest id: ${item.id}`,
          book.package.packagePath,
        ),
      );
    ids.add(item.id);
    if (!item.href || !item.path) {
      result.push(
        issue(
          "error",
          "invalid-manifest-href",
          `Manifest item ${item.id || "(without id)"} has an empty or external href.`,
          book.package.packagePath,
        ),
      );
      continue;
    }
    if (manifestPaths.has(item.path))
      result.push(
        issue(
          "warning",
          "duplicate-manifest-target",
          `More than one manifest item targets ${item.path}.`,
          book.package.packagePath,
        ),
      );
    manifestPaths.add(item.path);
    if (!book.entryByPath.has(item.path))
      result.push(
        issue(
          "error",
          "missing-manifest-resource",
          `Manifest resource is missing: ${item.path}`,
          item.path,
        ),
      );
  }
  for (const spine of book.package.spine) {
    if (!spine.item)
      result.push(
        issue(
          "error",
          "missing-spine-item",
          `Spine idref does not exist in the manifest: ${spine.idref}`,
          book.package.packagePath,
        ),
      );
    else if (
      !/^(?:application\/xhtml\+xml|text\/html)$/iu.test(spine.item.mediaType)
    )
      result.push(
        issue(
          "warning",
          "non-html-spine",
          `Spine item ${spine.idref} has media type ${spine.item.mediaType || "(empty)"}.`,
          spine.item.path,
        ),
      );
  }
  const linkedTargets = new Set<string>();
  let inspectedBytes = 0;
  let inspectedDocuments = 0;
  for (const item of book.package.manifest) {
    if (
      !/^(?:application\/xhtml\+xml|image\/svg\+xml|text\/html)$/iu.test(
        item.mediaType,
      ) ||
      !book.entryByPath.has(item.path)
    )
      continue;
    const entry = book.entryByPath.get(item.path);
    if (
      !entry ||
      entry.directory ||
      entry.uncompressedSize > 4 * 1024 * 1024 ||
      inspectedBytes + entry.uncompressedSize > 32 * 1024 * 1024 ||
      inspectedDocuments >= 500
    )
      continue;
    inspectedBytes += entry.uncompressedSize;
    inspectedDocuments += 1;
    try {
      const document = parseXml(
        await readEntryText(book, item.path, 4 * 1024 * 1024),
        item.path,
      );
      if (document.querySelector("script, iframe, object, embed, form"))
        result.push(
          issue(
            "warning",
            "active-content",
            "Active or interactive content is present and will be removed by the safe reader.",
            item.path,
          ),
        );
      for (const element of [
        ...document.querySelectorAll("[href], [src], [poster]"),
      ]) {
        const attribute = element.hasAttribute("href")
          ? "href"
          : element.hasAttribute("src")
            ? "src"
            : "poster";
        const reference = element.getAttribute(attribute)?.trim() ?? "";
        if (
          !reference ||
          reference.startsWith("#") ||
          reference.startsWith("data:")
        )
          continue;
        if (isExternalReference(reference)) {
          if (attribute !== "href" || element.localName !== "a")
            result.push(
              issue(
                "warning",
                "external-resource",
                `External ${attribute} is blocked by the safe reader: ${reference.slice(0, 180)}`,
                item.path,
              ),
            );
          continue;
        }
        try {
          const target = resolvePackageHref(item.path, reference);
          if (target) {
            linkedTargets.add(target);
            if (!book.entryByPath.has(target))
              result.push(
                issue(
                  "error",
                  "broken-link",
                  `Referenced resource is missing: ${target}`,
                  item.path,
                ),
              );
          }
        } catch (reason) {
          result.push(
            issue(
              "error",
              "unsafe-link",
              reason instanceof Error
                ? reason.message
                : "Unsafe relative link.",
              item.path,
            ),
          );
        }
      }
    } catch (reason) {
      result.push(
        issue(
          "error",
          "invalid-content-document",
          reason instanceof Error
            ? reason.message
            : "Content document parsing failed.",
          item.path,
        ),
      );
    }
  }
  if (
    inspectedDocuments <
    book.package.manifest.filter((item) =>
      /xhtml|html|svg/iu.test(item.mediaType),
    ).length
  )
    result.push(
      issue(
        "info",
        "link-scan-bounded",
        `Link scan inspected ${inspectedDocuments} documents and ${inspectedBytes.toLocaleString()} bytes; oversized or excess documents were skipped.`,
        book.package.packagePath,
      ),
    );
  const allowedUnmanifested = new Set([
    "mimetype",
    "META-INF/container.xml",
    "META-INF/encryption.xml",
    "META-INF/signatures.xml",
    book.package.packagePath,
  ]);
  const hidden = book.entries.filter(
    (entry) =>
      !entry.directory &&
      !manifestPaths.has(entry.filename) &&
      !allowedUnmanifested.has(entry.filename),
  );
  if (hidden.length)
    result.push(
      issue(
        "info",
        "unmanifested-resources",
        `${hidden.length} unmanifested archive entries are present. Review the package tree before sharing.`,
        hidden[0]?.filename,
      ),
    );
  return result;
 }
@@ -0,0 +1,49 @@
 import { decodeText } from "@add-ideas/toolbox-helpers";
 export function decodeXml(bytes: Uint8Array): string {
  if (bytes.length >= 2 && bytes[0] === 0xff && bytes[1] === 0xfe)
    return decodeText(bytes.subarray(2), "utf-16le");
  if (bytes.length >= 2 && bytes[0] === 0xfe && bytes[1] === 0xff)
    return decodeText(bytes.subarray(2), "utf-16be");
  const probe = new TextDecoder("ascii").decode(
    bytes.subarray(0, Math.min(bytes.length, 256)),
  );
  const encoding = /<\?xml[^>]*encoding=["']([^"']+)/iu
    .exec(probe)?.[1]
    ?.toLowerCase();
  if (encoding && !["utf-8", "utf8"].includes(encoding))
    throw new Error(
      `Unsupported XML encoding: ${encoding}. EPUB text must use UTF-8 or UTF-16.`,
    );
  return decodeText(bytes, "utf-8");
 }
 export function parseXml(text: string, label: string): XMLDocument {
  if (text.length > 16 * 1024 * 1024)
    throw new RangeError(`${label} exceeds the 16 MiB XML limit.`);
  if (/<!DOCTYPE|<!ENTITY/iu.test(text))
    throw new Error(`${label} contains a forbidden DTD or entity declaration.`);
  const document = new DOMParser().parseFromString(text, "application/xml");
  const parserError = [...document.getElementsByTagName("parsererror")][0];
  if (parserError)
    throw new Error(
      `${label} is not well-formed XML: ${parserError.textContent?.trim().slice(0, 240) ?? "parser error"}`,
    );
  return document;
 }
 export function elementsByLocalName(
  parent: ParentNode,
  name: string,
 ): Element[] {
  return [...parent.querySelectorAll("*")].filter(
    (element) => element.localName === name,
  );
 }
 export function directChildrenByLocalName(
  parent: Element,
  name: string,
 ): Element[] {
  return [...parent.children].filter((element) => element.localName === name);
 }
@@ -0,0 +1,18 @@
 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);
  });
 }
@@ -0,0 +1,513 @@
 :root {
  --toolbox-background: #f6f7fb;
  --toolbox-surface: #fff;
  --toolbox-surface-soft: #eff1f7;
  --toolbox-text: #202332;
  --toolbox-muted: #656b7d;
  --toolbox-border: #d9dce7;
  --toolbox-accent: #5b4ec4;
  --toolbox-accent-hover: #493caf;
  --toolbox-accent-soft: #ece9ff;
  --toolbox-accent-contrast: #fff;
  --toolbox-focus: #137d75;
  --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, sans-serif;
 }
 button,
 input,
 select,
 textarea {
  font: inherit;
 }
 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-weight: 720;
  cursor: pointer;
  text-decoration: none;
 }
 button:hover:not(:disabled),
 .button:hover {
  border-color: var(--toolbox-accent);
  background: var(--toolbox-surface-soft);
 }
 button:disabled {
  cursor: not-allowed;
  opacity: 0.6;
 }
 :where(button, input, select, textarea, a):focus-visible {
  outline: 3px solid color-mix(in srgb, var(--toolbox-focus) 42%, transparent);
  outline-offset: 2px;
 }
 input,
 select,
 textarea {
  width: 100%;
  min-height: 2.55rem;
  padding: 0.58rem 0.7rem;
  border: 1px solid var(--toolbox-border);
  border-radius: 0.62rem;
  background: var(--toolbox-surface);
  color: var(--toolbox-text);
 }
 textarea {
  min-height: 7rem;
  resize: vertical;
  line-height: 1.45;
 }
 input[type="file"] {
  position: absolute;
  width: 1px;
  height: 1px;
  min-height: 0;
  padding: 0;
  opacity: 0;
  pointer-events: none;
 }
 .toolbox-shell__main {
  width: min(100%, 90rem);
  padding: clamp(0.75rem, 1.8vw, 1.5rem);
 }
 .workbench {
  display: grid;
  gap: 1rem;
 }
 .hero,
 .panel,
 .summary-grid article {
  border: 1px solid var(--toolbox-border);
  border-radius: 0.9rem;
  background: var(--toolbox-surface);
  box-shadow: 0 8px 28px rgb(30 36 70 / 4%);
 }
 .hero {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: flex-start;
  padding: clamp(1.1rem, 3vw, 2rem);
 }
 .hero h1,
 .panel h2,
 .panel h3,
 .help-dialog h2,
 .fatal h1 {
  margin: 0;
  letter-spacing: -0.025em;
 }
 .hero p:not(.eyebrow) {
  max-width: 57rem;
  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 {
  flex: 0 0 auto;
  padding: 0.38rem 0.62rem;
  border-radius: 999px;
  background: var(--toolbox-accent-soft);
  color: var(--toolbox-accent);
  font-size: 0.75rem;
  font-weight: 760;
 }
 .panel {
  padding: 1rem;
 }
 .primary {
  border-color: var(--toolbox-accent);
  background: var(--toolbox-accent);
  color: var(--toolbox-accent-contrast);
 }
 .drop {
  min-height: 19rem;
  display: grid;
  grid-template-columns: minmax(7rem, 13rem) minmax(15rem, 32rem);
  place-content: center;
  align-items: center;
  gap: 2rem;
  border-style: dashed;
 }
 .drop h2 {
  margin-bottom: 0.6rem;
  font-size: clamp(1.6rem, 4vw, 2.4rem);
 }
 .drop p:not(.eyebrow) {
  color: var(--toolbox-muted);
  line-height: 1.55;
 }
 .book-mark {
  min-height: 11rem;
  display: grid;
  place-items: center;
  border-radius: 0.8rem 0.4rem 0.4rem 0.8rem;
  background: linear-gradient(140deg, var(--toolbox-accent), #8a75e8);
  color: #fff;
  font-size: 1.4rem;
  font-weight: 900;
  letter-spacing: 0.15em;
  box-shadow: inset 1rem 0 rgb(0 0 0 / 12%);
 }
 .file-bar {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
 }
 .file-bar > div {
  min-width: 0;
  display: grid;
  gap: 0.2rem;
 }
 .file-bar strong {
  overflow: hidden;
  text-overflow: ellipsis;
 }
 .file-bar span {
  color: var(--toolbox-muted);
 }
 .summary-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
 }
 .summary-grid article {
  min-width: 0;
  display: grid;
  gap: 0.35rem;
  padding: 0.85rem;
 }
 .summary-grid span {
  color: var(--toolbox-muted);
  font-size: 0.72rem;
  font-weight: 760;
  text-transform: uppercase;
  letter-spacing: 0.08em;
 }
 .summary-grid strong,
 .summary-grid small {
  overflow: hidden;
  text-overflow: ellipsis;
 }
 .summary-grid small {
  color: var(--toolbox-muted);
 }
 .summary-grid .good {
  border-color: #55a875;
 }
 .summary-grid .warn {
  border-color: #d9a72e;
 }
 .summary-grid .bad {
  border-color: var(--toolbox-danger);
 }
 .workspace-tabs {
  display: flex;
  gap: 0.4rem;
  overflow-x: auto;
  padding: 0.75rem;
 }
 .workspace-tabs button[aria-selected="true"] {
  border-color: var(--toolbox-accent);
  background: var(--toolbox-accent);
  color: var(--toolbox-accent-contrast);
 }
 .workspace {
  display: grid;
  gap: 0.9rem;
  min-width: 0;
 }
 .panel-heading {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: end;
  margin-bottom: 0.9rem;
 }
 .reader-layout {
  display: grid;
  grid-template-columns: minmax(15rem, 19rem) minmax(0, 1fr);
  gap: 1rem;
  align-items: start;
 }
 .chapter-list {
  max-height: calc(100vh - 12rem);
  display: grid;
  gap: 0.35rem;
  overflow: auto;
  position: sticky;
  top: 0.75rem;
 }
 .chapter-list > div {
  margin-bottom: 0.4rem;
 }
 .chapter-list button {
  justify-content: start;
  text-align: left;
 }
 .chapter-list button > span {
  flex: 0 0 1.8rem;
  display: grid;
  place-items: center;
  min-height: 1.8rem;
  border-radius: 999px;
  background: var(--toolbox-surface-soft);
  color: var(--toolbox-muted);
  font-size: 0.7rem;
 }
 .chapter-list button.active {
  border-color: var(--toolbox-accent);
  background: var(--toolbox-accent-soft);
  color: var(--toolbox-accent);
 }
 .page-reader {
  min-height: 38rem;
  min-width: 0;
  overflow: auto;
 }
 .page-reader iframe {
  width: 100%;
  height: min(65rem, calc(100vh - 13rem));
  min-height: 34rem;
  border: 1px solid var(--toolbox-border);
  border-radius: 0.65rem;
  background: #fff;
 }
 .field {
  display: grid;
  gap: 0.35rem;
  min-width: 0;
 }
 .field > span {
  font-size: 0.76rem;
  font-weight: 750;
 }
 .form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 14rem), 1fr));
  gap: 0.7rem;
 }
 .issue-group {
  display: grid;
  gap: 0.5rem;
 }
 .issue {
  display: grid;
  grid-template-columns: minmax(9rem, 0.35fr) 1fr;
  gap: 0.6rem;
  padding: 0.65rem;
  border-left: 0.25rem solid var(--toolbox-border);
  border-radius: 0.45rem;
  background: var(--toolbox-surface-soft);
 }
 .issue.error {
  border-color: var(--toolbox-danger);
 }
 .issue.warning {
  border-color: #d9a72e;
 }
 .issue.info {
  border-color: var(--toolbox-accent);
 }
 .issue code {
  grid-column: 2;
  color: var(--toolbox-muted);
  overflow-wrap: anywhere;
 }
 .table-scroll {
  max-height: 42rem;
  overflow: auto;
  border: 1px solid var(--toolbox-border);
  border-radius: 0.65rem;
 }
 table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
 }
 th,
 td {
  padding: 0.55rem;
  border-bottom: 1px solid var(--toolbox-border);
  text-align: left;
  vertical-align: top;
 }
 th {
  position: sticky;
  top: 0;
  z-index: 1;
  background: var(--toolbox-surface-soft);
 }
 td code {
  overflow-wrap: anywhere;
 }
 .export-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.8rem;
 }
 .export-grid article {
  display: grid;
  align-content: start;
  gap: 0.7rem;
  padding: 0.85rem;
  border: 1px solid var(--toolbox-border);
  border-radius: 0.7rem;
  background: var(--toolbox-surface-soft);
 }
 .export-grid p {
  margin: 0;
  color: var(--toolbox-muted);
  line-height: 1.5;
 }
 .actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
 }
 .check {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  font-weight: 680;
 }
 .check input {
  width: auto;
  min-height: auto;
 }
 .muted {
  margin: 0;
  color: var(--toolbox-muted);
  line-height: 1.5;
 }
 .empty {
  min-height: 10rem;
  display: grid;
  place-items: center;
  margin: 0;
  color: var(--toolbox-muted);
  text-align: center;
 }
 .error,
 .warning,
 .notice,
 .success {
  margin: 0;
  padding: 0.7rem;
  border: 1px solid var(--toolbox-border);
  border-radius: 0.65rem;
  line-height: 1.5;
 }
 .error {
  border-color: var(--toolbox-danger);
  color: var(--toolbox-danger);
 }
 .warning {
  border-color: #d9a72e;
  background: #fff8df;
  color: #725000;
 }
 .notice {
  background: var(--toolbox-surface-soft);
 }
 .success {
  border-color: #55a875;
  background: #eaf8ef;
  color: #176137;
 }
 .loading,
 .fatal {
  width: min(100% - 2rem, 60rem);
  margin: 2rem auto;
  padding: 1rem;
 }
 .help-dialog {
  width: min(36rem, calc(100% - 2rem));
  border: 1px solid var(--toolbox-border);
  border-radius: 0.9rem;
  background: var(--toolbox-surface);
  color: var(--toolbox-text);
 }
 .help-dialog::backdrop {
  background: rgb(20 24 45 / 55%);
 }
 .dialog-heading {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: start;
 }
@media (max-width: 68rem) {
  .summary-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .reader-layout {
    grid-template-columns: 1fr;
  }
  .chapter-list {
    position: static;
    max-height: 18rem;
  }
  .export-grid {
    grid-template-columns: 1fr;
  }
 }
@media (max-width: 44rem) {
  .hero,
  .file-bar,
  .panel-heading {
    flex-direction: column;
    align-items: stretch;
  }
  .privacy-pill {
    order: -1;
    align-self: start;
  }
  .drop {
    grid-template-columns: 1fr;
  }
  .book-mark {
    min-height: 6rem;
  }
  .summary-grid {
    grid-template-columns: 1fr;
  }
  .issue {
    grid-template-columns: 1fr;
  }
  .issue code {
    grid-column: auto;
  }
 }
@@ -0,0 +1,8 @@
 import "@testing-library/jest-dom/vitest";
 import { afterEach } from "vitest";
 import { cleanup } from "@testing-library/react";
 afterEach(() => {
  cleanup();
  localStorage.clear();
 });
@@ -0,0 +1,41 @@
 {
  "$schema": "https://git.add-ideas.de/lotobo/toolbox-sdk/raw/branch/main/schemas/toolbox-app.v1.schema.json",
  "schemaVersion": 1,
  "id": "de.add-ideas.epub-tools",
  "name": "EPUB Tools",
  "version": "0.1.0",
  "description": "Read, inspect and repair EPUB publications locally in the browser.",
  "entry": "./",
  "icon": "./favicon.svg",
  "categories": ["documents", "ebooks", "publishing"],
  "tags": ["epub", "ebook", "metadata", "reader", "repair"],
  "integration": {
    "contextVersion": 1,
    "launchModes": ["navigate", "new-tab"],
    "embedding": "unsupported"
  },
  "requirements": {
    "secureContext": false,
    "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/epub-tools",
    "license": "GPL-3.0-or-later"
  },
  "actions": [
    {
      "id": "source",
      "label": "Source",
      "url": "https://git.add-ideas.de/lotobo/epub-tools"
    }
  ]
 }
@@ -0,0 +1,4 @@
 import { defineToolboxApp, parseToolboxApp } from "@add-ideas/toolbox-contract";
 import source from "./manifest.source.json";
 export const manifest = defineToolboxApp(parseToolboxApp(source));
@@ -0,0 +1 @@
 export const APP_VERSION = "0.1.0";
@@ -0,0 +1 @@
 /// <reference types="vite/client" />
@@ -0,0 +1,124 @@
 import { expect, test, type Page } from "@playwright/test";
 import {
  TextReader,
  Uint8ArrayReader,
  Uint8ArrayWriter,
  ZipWriter,
 } from "@zip.js/zip.js";
 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;
 }
 async function epubFixture(): Promise<Buffer> {
  const writer = new ZipWriter(new Uint8ArrayWriter());
  await writer.add("mimetype", new TextReader("application/epub+zip"), {
    level: 0,
  });
  await writer.add(
    "META-INF/container.xml",
    new TextReader(
      `<?xml version="1.0"?><container xmlns="urn:oasis:names:tc:opendocument:xmlns:container"><rootfiles><rootfile full-path="EPUB/package.opf" media-type="application/oebps-package+xml"/></rootfiles></container>`,
    ),
  );
  await writer.add(
    "EPUB/package.opf",
    new TextReader(
      `<?xml version="1.0"?><package xmlns="http://www.idpf.org/2007/opf" version="3.0" unique-identifier="id"><metadata xmlns:dc="http://purl.org/dc/elements/1.1/"><dc:identifier id="id">urn:browser:test</dc:identifier><dc:title>Browser Fixture</dc:title><dc:language>en</dc:language><dc:creator>Local Author</dc:creator></metadata><manifest><item id="nav" href="nav.xhtml" media-type="application/xhtml+xml" properties="nav"/><item id="chapter" href="chapter.xhtml" media-type="application/xhtml+xml"/><item id="cover" href="cover.png" media-type="image/png" properties="cover-image"/></manifest><spine><itemref idref="chapter"/></spine></package>`,
    ),
  );
  await writer.add(
    "EPUB/nav.xhtml",
    new TextReader(
      `<?xml version="1.0"?><html xmlns="http://www.w3.org/1999/xhtml" xmlns:epub="http://www.idpf.org/2007/ops"><body><nav epub:type="toc"><ol><li><a href="chapter.xhtml">A safe chapter</a></li></ol></nav></body></html>`,
    ),
  );
  await writer.add(
    "EPUB/chapter.xhtml",
    new TextReader(
      `<?xml version="1.0"?><html xmlns="http://www.w3.org/1999/xhtml"><head><title>A safe chapter</title></head><body><h1>Hello from EPUB</h1><script>document.body.textContent='unsafe'</script><img src="cover.png"/></body></html>`,
    ),
  );
  await writer.add(
    "EPUB/cover.png",
    new Uint8ArrayReader(
      Buffer.from(
        "iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNk+A8AAQUBAScY42YAAAAASUVORK5CYII=",
        "base64",
      ),
    ),
  );
  return Buffer.from(await writer.close());
 }
 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/epub/");
  await expect(page.getByRole("heading", { name: "EPUB 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/epub/");
  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/epub/toolbox-app.json");
  await expect(manifest.json()).resolves.toMatchObject({
    id: "de.add-ideas.epub-tools",
    version: "0.1.0",
    entry: "./",
  });
 });
 test("opens, sanitizes, edits, rebuilds, and reopens a real EPUB", async ({
  page,
 }) => {
  const external = await localOnly(page);
  await page.goto("/deep/nested/epub/");
  await page.getByLabel("Choose EPUB").setInputFiles({
    name: "fixture.epub",
    mimeType: "application/epub+zip",
    buffer: await epubFixture(),
  });
  await expect(
    page.getByText("Browser Fixture", { exact: true }).first(),
  ).toBeVisible({ timeout: 30_000 });
  const reader = page.frameLocator("iframe[title^='Safe EPUB preview']");
  await expect(
    reader.getByRole("heading", { name: "Hello from EPUB" }),
  ).toBeVisible();
  await expect(reader.locator("script")).toHaveCount(0);
  await page.getByRole("tab", { name: "Metadata" }).click();
  await page.getByLabel("Title").fill("Updated in browser");
  await page.getByRole("tab", { name: "Export & rebuild" }).click();
  const downloadPromise = page.waitForEvent("download");
  await page.getByRole("button", { name: "Create updated EPUB" }).click();
  const download = await downloadPromise;
  const path = await download.path();
  expect(path).toBeTruthy();
  await page.getByLabel("Open another").setInputFiles(path!);
  await expect(
    page.getByText("Updated in browser", { exact: true }).first(),
  ).toBeVisible({ timeout: 30_000 });
  expect(external).toEqual([]);
 });
@@ -0,0 +1,19 @@
 import { render, screen } from "@testing-library/react";
 import { describe, expect, it, vi } from "vitest";
 import { App } from "../../src/App";
 describe("EPUB 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: "EPUB Tools" }),
    ).toBeVisible();
    expect(
      await screen.findByText("Sandboxed reader · local files"),
    ).toBeVisible();
  });
 });
@@ -0,0 +1,114 @@
 import { Blob as NodeBlob, File as NodeFile } from "node:buffer";
 import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
 import { closeBook, openEpub } from "../../src/epub/archive";
 import { patchPackageMetadata, rebuildEpub } from "../../src/epub/export";
 import { resolvePackageHref, validateEntryPath } from "../../src/epub/paths";
 import { renderChapter, revokeRenderedChapter } from "../../src/epub/reader";
 import type { EpubBook } from "../../src/epub/types";
 import { createEpubFixture } from "./fixture";
 let opened: EpubBook[] = [];
 beforeEach(() => {
  vi.stubGlobal("Blob", NodeBlob);
  vi.stubGlobal("File", NodeFile);
 });
 afterEach(async () => {
  for (const book of opened) await closeBook(book);
  opened = [];
  vi.unstubAllGlobals();
 });
 describe("EPUB path policy", () => {
  it("resolves package-relative references and rejects traversal", () => {
    expect(
      resolvePackageHref("EPUB/text/chapter.xhtml", "../images/cover.png#art"),
    ).toBe("EPUB/images/cover.png");
    expect(() => resolvePackageHref("chapter.xhtml", "../outside")).toThrow(
      /escapes/u,
    );
    expect(() => validateEntryPath("../escape")).toThrow(/traversal/u);
  });
 });
 describe("EPUB package inspection", () => {
  it("opens metadata, navigation, spine, and bounded inventory", async () => {
    const book = await openEpub(await createEpubFixture());
    opened.push(book);
    expect(book.package.metadata).toMatchObject({
      title: "Fixture Book",
      language: "en",
      identifier: "urn:test:book",
    });
    expect(book.package.navigation[0]).toMatchObject({
      label: "Opening chapter",
      path: "EPUB/chapter.xhtml",
    });
    expect(book.package.spine[0]?.item?.path).toBe("EPUB/chapter.xhtml");
    expect(book.summary).toMatchObject({
      mimetypeFirst: true,
      mimetypeStored: true,
      encryptedResources: false,
    });
    expect(book.issues.filter((item) => item.severity === "error")).toEqual([]);
  });
  it("reports active content and broken resources", async () => {
    const book = await openEpub(
      await createEpubFixture({ activeContent: true, brokenLink: true }),
    );
    opened.push(book);
    expect(book.issues.map((item) => item.code)).toEqual(
      expect.arrayContaining(["active-content", "broken-link"]),
    );
  });
 });
 describe("safe rendering and editing", () => {
  it("removes active content, disables links, and resolves local images", async () => {
    vi.stubGlobal("URL", {
      ...URL,
      createObjectURL: vi.fn(() => "blob:fixture-cover"),
      revokeObjectURL: vi.fn(),
    });
    const book = await openEpub(
      await createEpubFixture({ activeContent: true }),
    );
    opened.push(book);
    const chapter = await renderChapter(book, "EPUB/chapter.xhtml");
    expect(chapter.html).not.toMatch(/<script|<form|<input/iu);
    expect(chapter.html).toContain('src="blob:fixture-cover"');
    expect(chapter.html).toContain('data-epub-href="nav.xhtml"');
    expect(chapter.html).toContain("default-src 'none'");
    revokeRenderedChapter(chapter);
  });
  it("patches metadata and rebuilds a readable normalized EPUB", async () => {
    const book = await openEpub(await createEpubFixture());
    opened.push(book);
    const metadata = {
      ...book.package.metadata,
      title: "Updated title",
      creators: ["One", "Two"],
      subjects: ["Testing"],
    };
    const xml = patchPackageMetadata(book.packageXml, metadata);
    expect(xml).toContain("Updated title");
    expect(xml.match(/<dc:creator/gu)).toHaveLength(2);
    const rebuilt = await rebuildEpub(book, {
      metadata,
      normalizeTimestamps: true,
    });
    const reopened = await openEpub(
      new File([rebuilt.blob], "rebuilt.epub", {
        type: "application/epub+zip",
      }),
    );
    opened.push(reopened);
    expect(reopened.package.metadata.title).toBe("Updated title");
    expect(reopened.package.metadata.creators).toEqual(["One", "Two"]);
    expect(reopened.summary).toMatchObject({
      mimetypeFirst: true,
      mimetypeStored: true,
    });
  });
 });
@@ -0,0 +1,51 @@
 import {
  BlobWriter,
  TextReader,
  Uint8ArrayReader,
  ZipWriter,
 } from "@zip.js/zip.js";
 export async function createEpubFixture(
  options: {
    brokenLink?: boolean;
    activeContent?: boolean;
    compressedMimetype?: boolean;
  } = {},
 ): Promise<File> {
  const writer = new ZipWriter(new BlobWriter("application/epub+zip"));
  await writer.add("mimetype", new TextReader("application/epub+zip"), {
    level: options.compressedMimetype ? 6 : 0,
  });
  await writer.add(
    "META-INF/container.xml",
    new TextReader(
      `<?xml version="1.0"?><container xmlns="urn:oasis:names:tc:opendocument:xmlns:container"><rootfiles><rootfile full-path="EPUB/package.opf" media-type="application/oebps-package+xml"/></rootfiles></container>`,
    ),
  );
  await writer.add(
    "EPUB/package.opf",
    new TextReader(
      `<?xml version="1.0" encoding="UTF-8"?><package xmlns="http://www.idpf.org/2007/opf" version="3.0" unique-identifier="book-id"><metadata xmlns:dc="http://purl.org/dc/elements/1.1/"><dc:identifier id="book-id">urn:test:book</dc:identifier><dc:title>Fixture Book</dc:title><dc:language>en</dc:language><dc:creator>Ada Example</dc:creator></metadata><manifest><item id="nav" href="nav.xhtml" media-type="application/xhtml+xml" properties="nav"/><item id="chapter" href="chapter.xhtml" media-type="application/xhtml+xml"/><item id="cover" href="cover.png" media-type="image/png" properties="cover-image"/></manifest><spine><itemref idref="chapter"/></spine></package>`,
    ),
  );
  await writer.add(
    "EPUB/nav.xhtml",
    new TextReader(
      `<?xml version="1.0"?><html xmlns="http://www.w3.org/1999/xhtml" xmlns:epub="http://www.idpf.org/2007/ops"><head><title>Contents</title></head><body><nav epub:type="toc"><ol><li><a href="chapter.xhtml">Opening chapter</a></li></ol></nav></body></html>`,
    ),
  );
  await writer.add(
    "EPUB/chapter.xhtml",
    new TextReader(
      `<?xml version="1.0"?><html xmlns="http://www.w3.org/1999/xhtml"><head><title>Opening chapter</title></head><body><h1>Hello</h1><p>Local reading.</p>${options.activeContent ? "<script>globalThis.pwned=true</script><form><input/></form>" : ""}<img src="cover.png"/><a href="${options.brokenLink ? "missing.xhtml" : "nav.xhtml"}">Next</a></body></html>`,
    ),
  );
  await writer.add(
    "EPUB/cover.png",
    new Uint8ArrayReader(
      new Uint8Array([0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a]),
    ),
  );
  const blob = await writer.close();
  return new File([blob], "fixture.epub", { type: "application/epub+zip" });
 }
@@ -0,0 +1,27 @@
 {
  "compilerOptions": {
    "tsBuildInfoFile": "./node_modules/.tmp/tsconfig.app.tsbuildinfo",
    "target": "ES2023",
    "lib": ["ES2023", "DOM", "DOM.Iterable"],
    "module": "ESNext",
    "types": ["vite/client", "node"],
    "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"]
 }
@@ -0,0 +1,11 @@
 {
  "files": [],
  "references": [
    {
      "path": "./tsconfig.app.json"
    },
    {
      "path": "./tsconfig.node.json"
    }
  ]
 }
@@ -0,0 +1,24 @@
 {
  "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"
  ]
 }
@@ -0,0 +1,16 @@
 /// <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/**"],
  },
 });
		`@@ -0,0 +1 @@`
							`@add-ideas:registry=https://git.add-ideas.de/api/packages/lotobo/npm/`
		`@@ -0,0 +1,3 @@`
							`# 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.
		`@@ -0,0 +1,3 @@`
							`# Licences`

							The application is GPL-3.0-or-later. Generated release artifacts include an exact runtime dependency licence inventory in `npm-runtime-licenses.txt`.
		`@@ -0,0 +1,3 @@`
							`# Security`

							`Please report vulnerabilities privately to the repository owner. Do not attach sensitive source files to public issues. Imported inputs are untrusted; parsers must remain bounded and must not execute active content or fetch external resources.`
		`@@ -0,0 +1 @@`
							`<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 64 64" role="img" aria-label="EPUB 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">EP</text></svg>`