feat(cases): link provider-owned evidence references
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2026-08-21 16:10:48 +02:00
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from __future__ import annotations
from dataclasses import dataclass
from datetime import UTC, datetime, timedelta
import unittest
from sqlalchemy import create_engine
from sqlalchemy.orm import Session
from govoplan_core.core.institutional import (
GovernedContextEnvelope,
InstitutionalReference,
TemporalRevision,
)
from govoplan_cases.backend.db.models import (
CaseAccessGrant,
CaseIdentity,
CaseRecordRevision,
CaseStatusDefinition,
CaseTimelineEntry,
CaseTypeDefinition,
)
from govoplan_cases.backend.domain import CaseRecord
from govoplan_cases.backend.evidence_links import (
link_case_evidence,
linked_source,
unlink_case_evidence,
)
from govoplan_cases.backend.service import (
CaseStoreError,
case_history,
case_timeline,
create_case,
update_case,
upsert_case_status,
upsert_case_type,
)
NOW = datetime(2026, 8, 21, 14, 0, tzinfo=UTC)
@dataclass
class Principal:
tenant_id: str = "tenant-1"
account_id: str = "account-1"
scopes: frozenset[str] = frozenset()
def ref(kind: str, object_id: str, owner: str) -> InstitutionalReference:
return InstitutionalReference(
kind=kind, # type: ignore[arg-type]
owner_module=owner,
object_id=object_id,
tenant_id="tenant-1",
version="1",
valid_at=NOW,
)
def case_record() -> CaseRecord:
case_ref = ref("case", "case-1", "cases")
return CaseRecord(
reference=case_ref,
case_number="PERMIT-2026-0001",
case_type_key="permit",
status_key="open",
title="Resident permit",
context=GovernedContextEnvelope(
tenant_id="tenant-1",
temporal=TemporalRevision(
revision="1",
valid_from=NOW,
recorded_at=NOW,
change_reason="Case intake.",
),
case_ref=case_ref,
),
opened_at=NOW,
recorded_at=NOW,
change_reason="Case created.",
)
def file_reference(**changes: str) -> dict[str, str]:
result = {
"owner_module": "files",
"kind": "file-version",
"object_id": "version-1",
"tenant_id": "tenant-1",
"version": "version-1",
"path": "/files?fileId=file-1&versionId=version-1",
}
result.update(changes)
return result
class CaseEvidenceLinkTests(unittest.TestCase):
def setUp(self) -> None:
self.engine = create_engine("sqlite+pysqlite:///:memory:")
for table in (
CaseStatusDefinition.__table__,
CaseTypeDefinition.__table__,
CaseIdentity.__table__,
CaseRecordRevision.__table__,
CaseAccessGrant.__table__,
CaseTimelineEntry.__table__,
):
table.create(self.engine)
self.session = Session(self.engine)
self.principal = Principal()
upsert_case_status(
self.session,
self.principal,
status_key="open",
label="Open",
)
upsert_case_type(
self.session,
self.principal,
type_key="permit",
label="Permit",
initial_status_key="open",
)
create_case(
self.session,
self.principal,
record=case_record(),
idempotency_key="create-case",
)
self.session.commit()
def tearDown(self) -> None:
self.session.close()
self.engine.dispose()
def link(self, **reference_changes: str) -> CaseRecord:
return link_case_evidence(
self.session,
self.principal,
case_id="case-1",
expected_revision=1,
reference=file_reference(**reference_changes),
recorded_at=NOW + timedelta(minutes=1),
change_reason="Linked exact file version.",
idempotency_key="link-file-1",
)
def test_link_appends_minimized_immutable_revision_and_audit_event(self) -> None:
linked = self.link()
self.session.commit()
self.assertEqual(2, linked.revision)
self.assertEqual(1, len(linked.evidence_refs))
evidence = linked.evidence_refs[0]
self.assertEqual("files", evidence.owner_module)
self.assertEqual("version-1", evidence.version)
self.assertTrue(evidence.evidence_id.startswith("linked-"))
source = linked_source(evidence)
self.assertEqual("file-version", source["kind"])
self.assertEqual("/files?fileId=file-1&versionId=version-1", source["path"])
self.assertNotIn("label", evidence.source_ref or "")
self.assertNotIn("content", evidence.source_ref or "")
history = case_history(
self.session,
self.principal,
case_id="case-1",
)
timeline = case_timeline(
self.session,
self.principal,
case_id="case-1",
)
self.assertEqual([2, 1], [item.revision for item in history])
self.assertEqual("cases.case.updated", timeline[0]["event_type"])
self.assertNotIn(evidence.evidence_id, str(timeline[0]["payload"]))
def test_link_is_replay_safe_and_rejects_duplicate_or_stale_changes(self) -> None:
first = self.link()
replay = self.link()
self.assertEqual(first.reference, replay.reference)
self.session.commit()
with self.assertRaisesRegex(CaseStoreError, "already linked"):
link_case_evidence(
self.session,
self.principal,
case_id="case-1",
expected_revision=2,
reference=file_reference(),
recorded_at=NOW + timedelta(minutes=2),
change_reason="Duplicate link.",
idempotency_key="duplicate-link",
)
updated = update_case(
self.session,
self.principal,
case_id="case-1",
expected_revision=2,
changes={"title": "Updated permit"},
recorded_at=NOW + timedelta(minutes=2),
change_reason="Updated title.",
idempotency_key="update-title",
)
self.assertEqual(3, updated.revision)
with self.assertRaisesRegex(CaseStoreError, "stale"):
link_case_evidence(
self.session,
self.principal,
case_id="case-1",
expected_revision=2,
reference={
"owner_module": "campaigns",
"kind": "campaign",
"object_id": "campaign-1",
"tenant_id": "tenant-1",
"version": "campaign-version-1",
"path": "/campaigns/campaign-1",
},
recorded_at=NOW + timedelta(minutes=3),
change_reason="Stale link.",
idempotency_key="stale-link",
)
def test_rejects_cross_tenant_unsupported_and_malformed_owner_paths(self) -> None:
for changes, message in (
({"tenant_id": "tenant-2"}, "cross Case tenants"),
({"owner_module": "unknown"}, "not supported"),
({"path": "/files?versionId=version-1"}, "exact authorized"),
({"path": "https://example.invalid/file"}, "local platform"),
):
with self.subTest(changes=changes):
with self.assertRaisesRegex(CaseStoreError, message):
self.link(**changes)
def test_unlink_only_removes_cases_owned_links_and_is_replay_safe(self) -> None:
linked = self.link()
self.session.commit()
evidence_id = linked.evidence_refs[0].evidence_id
unlinked = unlink_case_evidence(
self.session,
self.principal,
case_id="case-1",
evidence_id=evidence_id,
expected_revision=2,
recorded_at=NOW + timedelta(minutes=2),
change_reason="Removed obsolete link.",
idempotency_key="unlink-file-1",
)
replay = unlink_case_evidence(
self.session,
self.principal,
case_id="case-1",
evidence_id=evidence_id,
expected_revision=2,
recorded_at=NOW + timedelta(minutes=2),
change_reason="Removed obsolete link.",
idempotency_key="unlink-file-1",
)
self.assertEqual(3, unlinked.revision)
self.assertEqual(unlinked.reference, replay.reference)
self.assertEqual((), unlinked.evidence_refs)
with self.assertRaisesRegex(CaseStoreError, "not found"):
unlink_case_evidence(
self.session,
self.principal,
case_id="case-1",
evidence_id="ordinary-evidence",
expected_revision=3,
recorded_at=NOW + timedelta(minutes=3),
change_reason="Invalid unlink.",
idempotency_key="invalid-unlink",
)
if __name__ == "__main__":
unittest.main()