STATUS.md

OAuth 2.1 Implementation Status

Based on RFC 9700 and OAuth 2.1 Authorization Framework requirements

Feature Implementation Status

Feature	Implementation Status	Unit Tests	Integration Tests	Notes
General Requirements
HTTPS for all communication	✅ Implemented	N/A	N/A	Assumed for production use
Authorization Code Grant with PKCE	✅ Fully Implemented	✅ Comprehensive	⚠️ Limited	Core flow with S256/plain methods
Exact redirect URI matching	✅ Fully Implemented	✅ Covered	✅ Comprehensive	No wildcard/prefix matching
State parameter required	✅ Fully Implemented	✅ Covered	✅ Covered	CSRF protection
No Implicit Grant support	✅ Fully Implemented	✅ Covered	✅ Comprehensive	response_type=token rejected
Authorization Endpoint
response_type=code only	✅ Fully Implemented	✅ Covered	✅ Comprehensive	Implicit grant rejected
Client ID validation	✅ Fully Implemented	✅ Covered	✅ Comprehensive	Registered clients only
Redirect URI exact matching	✅ Fully Implemented	✅ Covered	✅ Comprehensive	String equality validation
Scope parameter support	✅ Fully Implemented	✅ Covered	⚠️ Limited	Scope validation and consent
State parameter handling	✅ Fully Implemented	✅ Covered	✅ Covered	Returned unchanged
PKCE code_challenge validation	✅ Fully Implemented	✅ Comprehensive	❌ Missing	S256 and plain methods
Token Endpoint
Authorization code grant	✅ Fully Implemented	✅ Comprehensive	❌ Missing	Full PKCE validation
Refresh token grant	✅ Fully Implemented	✅ Comprehensive	❌ Missing	With token rotation
Client credentials grant	✅ Fully Implemented	✅ Comprehensive	✅ Covered	Server-to-server auth
Client authentication	✅ Fully Implemented	✅ Comprehensive	✅ Covered	client_secret_basic and none
PKCE code_verifier validation	✅ Fully Implemented	✅ Comprehensive	❌ Missing	Validated against challenge
Access Token
Cryptographically random	✅ Implemented	N/A	N/A	JWT tokens with signatures
Token validation	✅ Implemented	✅ Covered	❌ Missing	Resource server validation
Expiration (expires_in)	✅ Implemented	✅ Covered	❌ Missing	Configurable lifetimes
Invalid token error	✅ Implemented	✅ Covered	❌ Missing	invalid_token responses
Refresh Token
Refresh token usage	✅ Fully Implemented	✅ Comprehensive	❌ Missing	New access_token issuance
Invalid grant errors	✅ Fully Implemented	✅ Comprehensive	❌ Missing	Expired/invalid token handling
Refresh token rotation	✅ Fully Implemented	✅ Comprehensive	❌ Missing	Automatic token rotation
Security Features
Short access token lifetime	✅ Implemented	✅ Covered	❌ Missing	Configurable (default 3600s)
Longer refresh token lifetime	✅ Implemented	✅ Covered	❌ Missing	Configurable
Refresh token rotation	✅ Fully Implemented	✅ Comprehensive	❌ Missing	Single-use refresh tokens
Bearer tokens only	✅ Implemented	✅ Covered	❌ Missing	No URL token parameters
Error Handling
Standard error responses	✅ Fully Implemented	✅ Comprehensive	✅ Covered	RFC 6749 compliant
HTTP status codes	✅ Fully Implemented	✅ Covered	✅ Covered	400, 401, etc.
Invalid request errors	✅ Fully Implemented	✅ Comprehensive	✅ Comprehensive	Missing/invalid parameters
Invalid client errors	✅ Fully Implemented	✅ Comprehensive	✅ Comprehensive	Authentication failures
Invalid grant errors	✅ Fully Implemented	✅ Comprehensive	❌ Missing	Invalid codes/tokens
Unsupported grant type	✅ Fully Implemented	✅ Covered	❌ Missing	Invalid grant_type values

Test Coverage Summary

Unit Tests (✅ Strong Coverage)

• Token endpoint: All grant types with comprehensive error scenarios
• PKCE: Full code verifier/challenge validation
• Refresh tokens: Rotation and validation logic
• Client authentication: Multiple auth methods
• Error handling: Standard OAuth error responses

Integration Tests (⚠️ Limited Coverage)

• Authorization endpoint: Security validation and error cases
• Client credentials: Basic grant type testing
• Missing: Full OAuth flows, PKCE integration, refresh token flows

Implementation Notes

• OAuth 2.1 Compliant: Implementation follows RFC 9700 security requirements
• PKCE Required: Public clients must use PKCE
• Token Rotation: Automatic refresh token rotation implemented
• Scope Support: OpenID Connect scopes supported
• JWT Tokens: Access and ID tokens as signed JWTs

Areas for Improvement

1. Integration Testing: Add end-to-end OAuth flow tests
2. PKCE Integration: Test PKCE in authorization endpoint
3. Refresh Token Flows: Integration tests for token rotation
4. Error Scenarios: More comprehensive error case testing

Overall Assessment

The implementation is highly compliant with OAuth 2.1 security requirements, with strong unit test coverage for core functionality. Integration testing could be expanded to cover more end-to-end scenarios.