## Summary
This PR implements OAuth 2.0 Dynamic Client Registration (RFC 7591) and
OAuth 2.0 Protected Resource Metadata (RFC 9728) support, enabling
third-party applications to dynamically register as OAuth clients
without manual configuration.
## Key Changes
### OAuth Dynamic Client Registration
- **New Controller**: `OAuthRegistrationController` at `POST
/oauth/register` endpoint
- Validates client metadata according to RFC 7591 specifications
- Enforces PKCE-only public client model (no client secrets)
- Supports only `authorization_code` grant type and `code` response type
- Rate limits registrations to 10 per hour per IP address
- Returns `client_id` and registration metadata in response
- **Input Validation**: `OAuthRegisterInput` DTO with constraints on:
- Client name (max 256 chars)
- Redirect URIs (max 20, validated for security)
- Grant types, response types, scopes, and auth methods
- Logo and client URIs (max 2048 chars)
- **Discovery Endpoint Update**: Added `registration_endpoint` to OAuth
discovery metadata
### Stale Registration Cleanup
- **Cleanup Service**: Automatically removes OAuth-only registrations
older than 30 days that have no active installations
- **Cron Job**: Runs daily at 02:30 AM UTC with batch processing (100
records per batch)
- **CLI Command**: `cron:stale-registration-cleanup` to manually trigger
cleanup
### MCP (Model Context Protocol) Authentication
- **New Guard**: `McpAuthGuard` implements RFC 9728 compliance
- Wraps JWT authentication with proper error responses
- Returns `WWW-Authenticate` header with protected resource metadata URL
on 401
- Enables OAuth-protected MCP endpoints
### Protected Resource Metadata
- **New Endpoint**: `GET /.well-known/oauth-protected-resource` (RFC
9728)
- Advertises MCP resource as OAuth-protected
- Lists supported scopes and bearer token methods
- Enables OAuth clients to discover authorization requirements
### Application Registration Updates
- **New Source Type**: `OAUTH_ONLY` enum value for OAuth-only
registrations
- **Install Service**: Skips artifact installation for OAuth-only apps
(no code artifacts)
### Frontend Updates
- **Authorization Page**: Support both snake_case (standard OAuth) and
camelCase (legacy) query parameters
- `client_id` / `clientId`
- `code_challenge` / `codeChallenge`
- `redirect_uri` / `redirectUrl`
## Implementation Details
- **Rate Limiting**: Uses token bucket algorithm with 10 registrations
per 3,600,000ms window per IP
- **Scope Validation**: Requested scopes are capped to allowed OAuth
scopes; defaults to all scopes if not specified
- **Redirect URI Validation**: Uses existing `validateRedirectUri`
utility for security
- **Cache Headers**: Registration responses include `Cache-Control:
no-store` and `Pragma: no-cache`
- **Batch Processing**: Cleanup operations process 100 records at a time
to avoid memory issues
- **Grace Period**: 30-day grace period before cleanup to allow time for
client activation
https://claude.ai/code/session_01PxcuWFFRuXMASMaMGTLYk2
---------
Co-authored-by: Claude <[email protected]>
Co-authored-by: claude[bot] <41898282+claude[bot]@users.noreply.github.com>
Co-authored-by: github-actions <[email protected]>
Co-authored-by: cubic-dev-ai[bot] <191113872+cubic-dev-ai[bot]@users.noreply.github.com>
