Validate new user-provided IDs using the AIP-122 format while retaining legacy UID compatibility. Correct resource annotations and canonical names returned by user stats.
Implements critical OAuth 2.0 security improvements to protect against authorization code interception attacks and improve provider compatibility:
- Add PKCE (RFC 7636) support with SHA-256 code challenge/verifier
- Fix access token extraction to use standard field instead of Extra()
- Add OAuth error parameter handling (access_denied, invalid_scope, etc.)
- Maintain backward compatibility for non-PKCE flows
This brings the OAuth implementation up to modern security standards as recommended by Auth0, Okta, and the OAuth 2.0 Security Best Current Practice (RFC 8252).
Backend changes:
- Add code_verifier parameter to ExchangeToken with PKCE support
- Use token.AccessToken for better provider compatibility
- Update proto definition with optional code_verifier field
Frontend changes:
- Generate cryptographically secure PKCE parameters
- Include code_challenge in authorization requests
- Handle and display OAuth provider errors gracefully
- Pass code_verifier during token exchange
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
