feat: C2PA-verified video import via share sheet

[rabble]

Closes #2879

Summary

• Add C2PA Content Credentials validation for imported videos, gating imports to only verified human-made content
• Register diVine as an iOS/Android share target so users can share videos from Adobe Fresco, Premiere Pro, etc.
• iOS Share Extension (native Swift) receives files via App Group, deep-links into Flutter app for C2PA validation
• Android receives shared videos via intent filter
• Full import-to-library flow: validate C2PA → show verification status → create clip + draft → navigate to publish

What's included

New files:

• C2paImportResult model with source type classification (human/AI/composite)
• C2paImportValidationService reads C2PA manifests and classifies content origin
• VideoImportBloc manages the import state machine
• VideoImportService copies file, extracts thumbnail/metadata, creates clip + draft
• ImportVerificationPage/View shows verification result or education screen
• iOS ShareExtension/ with ShareViewController.swift
• Android intent filter for video/*

Modified files:

• C2paSigningService.signVideo() now accepts DigitalSourceType parameter
• app_router.dart - new route for import verification
• main.dart - service registration
• pubspec.yaml - added share_handler package

Remaining work (follow-up PRs)

1. Xcode target setup: Share Extension source files exist but the Xcode target must be added via File > New > Target > Share Extension
2. VideoMetadataScreen draft loading: Needs an alternative entry point to load a draft by ID (currently relies on recording flow providers)
3. Codemagic CI: Provisioning profile needed for co.openvine.app.ShareExtension

Test plan

• 37 new tests passing (model: 13, validation: 9, BLoC: 7, service: 3, widget: 5)
• flutter analyze clean on all new files
• Manual: Share a video from Photos to diVine on iOS simulator
• Manual: Share a C2PA-signed video (from Adobe Fresco or created with c2patool) and verify "Verified" screen
• Manual: Share a video without C2PA and verify education screen

🤖 Generated with Claude Code

[rabble]

Solid foundational work — good architecture (UI→BLoC→Service), proper BLoC patterns (droppable, addError, status enum), 37 tests, feature-flagged rollout. A few items to address:

Should fix:

1. Hardcoded route path — context.go('/video-metadata?draftId=...') in ImportVerificationView should use context.goNamed(...) per routing rules ("Prefer Name Over Path")
2. File paths in URL query params — filesystem paths can contain chars that break URL encoding. Use Uri.encodeComponent or pass via a different mechanism
3. RepositoryProvider wrapping services — C2paImportValidationService and VideoImportService are services, not repositories. Semantic mismatch with the architecture rules
4. Confirm codemagic.yaml change — removing NotificationServiceExtension bundle ID could break notification push provisioning

Notes:

• No share_handler listener wiring in this PR (feature is inert until follow-up) — expected per PR description
• The 2,443-line plan document adds review noise — consider keeping planning docs out of feature PRs

Nice C2PA verification flow and source classification logic. Looking forward to Part 2 with the share handler wiring.

🤖 Generated with Claude Code

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[github-actions]

Mobile PR Preview

Preview refreshed for 7b53e61

Last refresh: 7b53e61 at 2026-05-06 14:45:16 UTC (preview run)

Property	Value
Preview URL	https://4980254e.openvine-app.pages.dev
Pages project	openvine-app
Preview branch	pr-2878
PR branch	feat/c2pa-share-target
Commit	7b53e61

[rabble]

Draft review notes

The C2PA import architecture is plausible, but the current draft does not look end-to-end complete yet. The main platform entrypoints and success path still need wiring/verification.

Top findings

• High: Share entrypoints do not appear wired into Flutter.

  • share_handler is added, but I did not see actual usage. Android adds an ACTION_SEND video/* intent filter, but nothing appears to consume the shared URI and navigate to import verification. iOS opens divine://import?path=..., while the Flutter route added is /import-verification?path=... unless existing deep-link resolution maps that.

• High: Successful import likely dead-ends.

  • The UI navigates to /video-metadata?draftId=..., while the PR body lists “VideoMetadataScreen draft loading” as remaining work. That means the main success path is not complete.

• High: C2PA policy may accept unknown source types.

  • C2paSourceClassification.unknown is accepted because only AI-generated/composite-with-AI types are rejected. If the product promise is verified human-made content, unknown source types should fail closed.

• Medium: iOS Share Extension is source-only, not build-integrated.

  • The PR body says the Xcode target still must be added. Until target/entitlements/bundle/provisioning are in the project, iOS sharing is not shippable or CI-verifiable.

• Medium: Android shared videos are often content:// URIs.

  • The import service expects filesystem paths and uses File(sourcePath).copy(...), which will not work for raw content:// URIs unless a layer first materializes them to a file.

Security/privacy notes

Avoid logging full local file paths where possible. Also validate route path input carefully: non-empty, expected scheme/location, file exists/type/size before processing. proofManifestJson: validationResult.claimGenerator also sounds semantically wrong; a claim-generator string is not proof/manifest JSON.

Readiness

Keep draft until Android/iOS share handling is wired end-to-end, unknown C2PA source types fail closed, metadata draft loading works, and at least one manual/integration path validates the full import journey.

[NotThatKindOfDrLiz]

Closing this draft PR as stale and not currently shippable.

Reason for closing:

• The branch is out of date and GitHub reports it as dirty.
• The last CI run failed, and the CLA check is still pending.
• The PR description itself calls out core remaining work: Xcode Share Extension target setup, VideoMetadata draft-loading support, and Codemagic provisioning.
• Prior review also identified functional blockers in the end-to-end import path, including incomplete share-entry wiring and other readiness gaps.

This should come back as a fresh PR from current main if we still want the feature. At that point it should be narrowed to a reviewable, end-to-end shippable slice with green CI and complete platform wiring.

Closing rather than leaving a large incomplete draft open avoids confusion about implementation status.