Replace manual OAuth implementation with official @atproto/oauth-client-node library to properly support DPoP (Demonstrating Proof of Possession) authentication.
Changes:
- Added @atproto/oauth-client-node dependency
- Created OAuth state store (SurrealDB-backed) for CSRF protection
- Created OAuth session store (SurrealDB-backed) for token persistence
- Created OAuth client singleton with localhost exception for development
- Rewrote /api/auth/login to use client.authorize()
- Rewrote /api/auth/callback to use client.callback() with DPoP
- Updated lib/auth/session.ts with getAuthenticatedAgent() for ATproto API calls
- Updated db/schema.surql with oauth_state and oauth_session tables
- Added scripts/apply-schema.js for database schema management
- Created plans/oauth-dpop-implementation.md with detailed implementation plan
- Removed legacy lib/auth/atproto.ts and lib/auth/oauth-state.ts
- Updated .env to use localhost exception (removed BLUESKY_CLIENT_ID)
The OAuth client now handles:
- PKCE code generation and verification
- DPoP proof generation and signing
- Automatic token refresh
- Session persistence across server restarts
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
Albert
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