feat(oauth): Phase B — claude.ai protocol compatibility

Add 3 features for claude.ai Connectors compatibility:

- FEATURE-3: client_secret_basic auth on token endpoint (RFC 6749 §2.3.1)
- FEATURE-2: Token revocation endpoint /oauth/revoke (RFC 7009)
- FEATURE-4: resource parameter support with JWT aud claim (RFC 8707)

23 new tests (481 total), all passing.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

core/oauth/schemas.py

@@ -63,6 +63,7 @@ class AuthorizationCode(BaseModel):
     api_key_id: str | None = None  # API Key ID for scope/project inheritance
     api_key_project_id: str | None = None  # Project ID from API Key
     api_key_scope: str | None = None  # Scope from API Key
+    resource: str | None = None  # RFC 8707: Resource indicator
 
     def is_expired(self) -> bool:
         """Check if code is expired"""

core/oauth/server.py

@@ -143,6 +143,7 @@ class OAuthServer:
         api_key_id: str | None = None,
         api_key_project_id: str | None = None,
         api_key_scope: str | None = None,
+        resource: str | None = None,
     ) -> str:
         """
         Create authorization code (Step 2 of Authorization Code flow)
@@ -157,6 +158,7 @@ class OAuthServer:
             api_key_id: Optional API Key ID for scope/project inheritance
             api_key_project_id: Optional project ID from API Key
             api_key_scope: Optional scope from API Key
+            resource: Optional resource indicator (RFC 8707)
 
         Returns:
             Authorization code (valid for 5 minutes)
@@ -178,6 +180,7 @@ class OAuthServer:
             api_key_id=api_key_id,
             api_key_project_id=api_key_project_id,
             api_key_scope=api_key_scope,
+            resource=resource,
         )
 
         # Save to storage
@@ -257,12 +260,14 @@ class OAuthServer:
         # If authorization code has API Key metadata, use it for scoping
         project_id = auth_code.api_key_project_id or "*"
         token_scope = auth_code.api_key_scope or auth_code.scope
+        resource = auth_code.resource
 
         access_token = self.token_manager.generate_access_token(
             client_id=client_id,
             scope=token_scope,
             user_id=auth_code.user_id or auth_code.api_key_id,
             project_id=project_id,
+            resource=resource,
         )
 
         refresh_token = self.token_manager.generate_refresh_token(

core/oauth/token_manager.py

@@ -54,7 +54,12 @@ class TokenManager:
         self.refresh_token_ttl = int(os.getenv("OAUTH_REFRESH_TOKEN_TTL", "604800"))  # 7 days
 
     def generate_access_token(
-        self, client_id: str, scope: str, user_id: str | None = None, project_id: str = "*"
+        self,
+        client_id: str,
+        scope: str,
+        user_id: str | None = None,
+        project_id: str = "*",
+        resource: str | None = None,
     ) -> str:
         """
         Generate JWT access token.
@@ -64,6 +69,7 @@ class TokenManager:
             scope: Granted scopes (space-separated)
             user_id: User ID (optional, for user-based auth)
             project_id: Project ID for scoping (default: "*" for global)
+            resource: Resource indicator for aud claim (RFC 8707)
 
         Returns:
             JWT access token
@@ -87,6 +93,9 @@ class TokenManager:
         if user_id:
             payload["sub"] = user_id  # Subject (user ID)
 
+        if resource:
+            payload["aud"] = resource
+
         # Encode JWT
         token = jwt.encode(payload, self.jwt_secret, algorithm=self.jwt_algorithm)