WIP: Staged all changes

backend/src/api/auth.py

@@ -0,0 +1,52 @@
+# [DEF:AuthModule:Module]
+# @SEMANTICS: auth, authentication, adfs, oauth, middleware
+# @PURPOSE: Implements ADFS authentication using Authlib for FastAPI. It provides a dependency to protect endpoints.
+# @LAYER: UI (API)
+# @RELATION: Used by API routers to protect endpoints that require authentication.
+
+from fastapi import Depends, HTTPException, status
+from fastapi.security import OAuth2AuthorizationCodeBearer
+from authlib.integrations.starlette_client import OAuth
+from starlette.config import Config
+
+# Placeholder for ADFS configuration. In a real app, this would come from a secure source.
+# Create an in-memory .env file
+from io import StringIO
+config_data = StringIO("""
+ADFS_CLIENT_ID=your-client-id
+ADFS_CLIENT_SECRET=your-client-secret
+ADFS_SERVER_METADATA_URL=https://your-adfs-server/.well-known/openid-configuration
+""")
+config = Config(config_data)
+oauth = OAuth(config)
+
+oauth.register(
+    name='adfs',
+    server_metadata_url=config('ADFS_SERVER_METADATA_URL'),
+    client_kwargs={'scope': 'openid profile email'}
+)
+
+oauth2_scheme = OAuth2AuthorizationCodeBearer(
+    authorizationUrl="https://your-adfs-server/adfs/oauth2/authorize",
+    tokenUrl="https://your-adfs-server/adfs/oauth2/token",
+)
+
+async def get_current_user(token: str = Depends(oauth2_scheme)):
+    """
+    Dependency to get the current user from the ADFS token.
+    This is a placeholder and needs to be fully implemented.
+    """
+    # In a real implementation, you would:
+    # 1. Validate the token with ADFS.
+    # 2. Fetch user information.
+    # 3. Create a user object.
+    # For now, we'll just check if a token exists.
+    if not token:
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Not authenticated",
+            headers={"WWW-Authenticate": "Bearer"},
+        )
+    # A real implementation would return a user object.
+    return {"placeholder_user": "user@example.com"}
+# [/DEF]