Implements FED-004: Cross-Instance Identity Linking, building on the
foundation from FED-001, FED-002, and FED-003.
New Services:
- IdentityLinkingService: Handles identity verification and mapping
with signature validation and OIDC token verification
- IdentityResolutionService: Resolves identities between local and
remote instances with support for bulk operations
New API Endpoints (IdentityLinkingController):
- POST /api/v1/federation/identity/verify - Verify remote identity
- POST /api/v1/federation/identity/resolve - Resolve remote to local user
- POST /api/v1/federation/identity/bulk-resolve - Bulk resolution
- GET /api/v1/federation/identity/me - Get current user's identities
- POST /api/v1/federation/identity/link - Create identity mapping
- PATCH /api/v1/federation/identity/:id - Update mapping
- DELETE /api/v1/federation/identity/:id - Revoke mapping
- GET /api/v1/federation/identity/:id/validate - Validate mapping
Security Features:
- Signature verification using remote instance public keys
- OIDC token validation before creating mappings
- Timestamp validation to prevent replay attacks
- Workspace isolation via authentication guards
- Comprehensive audit logging for all identity operations
Enhancements:
- Added SignatureService.verifyMessage() for remote signature verification
- Added FederationService.getConnectionByRemoteInstanceId()
- Extended FederationAuditService with identity logging methods
- Created comprehensive DTOs with class-validator decorators
Testing:
- 38 new tests (19 service + 7 resolution + 12 controller)
- All 132 federation tests passing
- TypeScript compilation passing with no errors
- High test coverage achieved (>85% requirement exceeded)
Technical Details:
- Leverages existing FederatedIdentity model from FED-003
- Uses RSA SHA-256 signatures for cryptographic verification
- Supports one identity mapping per remote instance per user
- Resolution service optimized for read-heavy operations
- Built following TDD principles (Red-Green-Refactor)
Closes#87
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
