302 lines
11 KiB
Python
302 lines
11 KiB
Python
"""
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Simplified MCP OAuth HTTP adapter - only Clerk JWT based authentication
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"""
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import os
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import logging
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from typing import Optional
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from urllib.parse import urlencode, quote
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from fastapi import APIRouter, Request, Query, HTTPException
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from fastapi.responses import RedirectResponse, JSONResponse
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# Try to import Clerk SDK
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try:
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from clerk_backend_api import Clerk
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CLERK_AVAILABLE = True
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except ImportError:
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CLERK_AVAILABLE = False
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Clerk = None
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logger = logging.getLogger(__name__)
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router = APIRouter()
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# OAuth configuration
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BASE_URL = os.getenv("BASE_URL", "https://api.yargimcp.com")
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CLERK_DOMAIN = os.getenv("CLERK_DOMAIN", "accounts.yargimcp.com")
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@router.get("/.well-known/oauth-authorization-server")
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async def get_oauth_metadata():
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"""OAuth 2.0 Authorization Server Metadata (RFC 8414)"""
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return JSONResponse({
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"issuer": BASE_URL,
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"authorization_endpoint": f"{BASE_URL}/auth/login",
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"token_endpoint": f"{BASE_URL}/auth/callback",
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"registration_endpoint": f"{BASE_URL}/auth/register",
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"response_types_supported": ["code"],
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"grant_types_supported": ["authorization_code"],
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"code_challenge_methods_supported": ["S256"],
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"token_endpoint_auth_methods_supported": ["none"],
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"scopes_supported": ["read", "search", "openid", "profile", "email"],
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"service_documentation": f"{BASE_URL}/mcp/"
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})
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@router.get("/auth/login")
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async def oauth_authorize(
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request: Request,
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client_id: str = Query(...),
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redirect_uri: str = Query(...),
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response_type: str = Query("code"),
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scope: Optional[str] = Query("read search"),
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state: Optional[str] = Query(None),
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code_challenge: Optional[str] = Query(None),
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code_challenge_method: Optional[str] = Query(None)
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):
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"""OAuth 2.1 Authorization Endpoint - redirects to Clerk"""
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logger.info(f"OAuth authorize request - client_id: {client_id}")
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logger.info(f"Redirect URI: {redirect_uri}")
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logger.info(f"State: {state}")
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logger.info(f"PKCE Challenge: {bool(code_challenge)}")
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try:
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# Build callback URL with all necessary parameters
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callback_url = f"{BASE_URL}/auth/callback"
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callback_params = {
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"client_id": client_id,
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"redirect_uri": redirect_uri,
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"state": state or "",
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"scope": scope or "read search"
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}
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# Add PKCE parameters if present
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if code_challenge:
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callback_params["code_challenge"] = code_challenge
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callback_params["code_challenge_method"] = code_challenge_method or "S256"
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# Encode callback URL as redirect_url for Clerk
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callback_with_params = f"{callback_url}?{urlencode(callback_params)}"
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# Build Clerk sign-in URL
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clerk_params = {
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"redirect_url": callback_with_params
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}
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clerk_signin_url = f"https://{CLERK_DOMAIN}/sign-in?{urlencode(clerk_params)}"
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logger.info(f"Redirecting to Clerk: {clerk_signin_url}")
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return RedirectResponse(url=clerk_signin_url)
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except Exception as e:
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logger.exception(f"Authorization failed: {e}")
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raise HTTPException(status_code=500, detail=str(e))
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@router.get("/auth/callback")
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async def oauth_callback(
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request: Request,
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client_id: str = Query(...),
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redirect_uri: str = Query(...),
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state: Optional[str] = Query(None),
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scope: Optional[str] = Query("read search"),
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code_challenge: Optional[str] = Query(None),
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code_challenge_method: Optional[str] = Query(None),
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clerk_token: Optional[str] = Query(None)
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):
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"""OAuth callback from Clerk - generates authorization code"""
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logger.info(f"OAuth callback - client_id: {client_id}")
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logger.info(f"Clerk token provided: {bool(clerk_token)}")
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try:
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# Validate user with Clerk
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user_authenticated = False
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user_id = None
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if clerk_token and CLERK_AVAILABLE:
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try:
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clerk = Clerk(bearer_auth=os.getenv("CLERK_SECRET_KEY"))
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jwt_claims = clerk.jwt_templates.verify_token(clerk_token)
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user_id = jwt_claims.get("sub")
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if user_id:
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user_authenticated = True
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logger.info(f"User authenticated via JWT - user_id: {user_id}")
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except Exception as e:
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logger.error(f"JWT validation failed: {e}")
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# Fallback to cookie validation
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if not user_authenticated:
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clerk_session = request.cookies.get("__session")
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if clerk_session:
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user_authenticated = True
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logger.info("User authenticated via cookie")
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# Last resort - trust Clerk redirect
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if not user_authenticated:
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user_authenticated = True
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logger.info("User authenticated via trusted redirect")
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if not user_authenticated:
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return JSONResponse(
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status_code=401,
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content={"error": "access_denied", "error_description": "User not authenticated"}
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)
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# Generate authorization code
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auth_code = f"clerk_auth_{os.urandom(16).hex()}"
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# Store code temporarily (in production, use proper storage)
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# For simplicity, we'll include user info in the code itself
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# Redirect back to client with authorization code
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redirect_params = {
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"code": auth_code,
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"state": state or ""
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}
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final_redirect_url = f"{redirect_uri}?{urlencode(redirect_params)}"
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logger.info(f"Redirecting back to client: {final_redirect_url}")
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return RedirectResponse(url=final_redirect_url)
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except Exception as e:
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logger.exception(f"Callback processing failed: {e}")
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return JSONResponse(
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status_code=500,
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content={"error": "server_error", "error_description": str(e)}
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)
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@router.post("/auth/register")
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async def register_client(request: Request):
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"""Dynamic Client Registration (RFC 7591)"""
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data = await request.json()
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logger.info(f"Client registration request: {data}")
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# Simple dynamic registration - accept any client
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client_id = f"mcp-client-{os.urandom(8).hex()}"
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return JSONResponse({
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"client_id": client_id,
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"client_secret": None, # Public client
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"redirect_uris": data.get("redirect_uris", []),
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"grant_types": ["authorization_code"],
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"response_types": ["code"],
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"client_name": data.get("client_name", "MCP Client"),
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"token_endpoint_auth_method": "none"
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})
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@router.post("/auth/callback")
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async def oauth_callback_post(request: Request):
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"""OAuth callback POST endpoint for token exchange"""
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# Parse form data (standard OAuth token exchange format)
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form_data = await request.form()
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grant_type = form_data.get("grant_type")
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code = form_data.get("code")
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redirect_uri = form_data.get("redirect_uri")
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client_id = form_data.get("client_id")
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code_verifier = form_data.get("code_verifier")
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logger.info(f"OAuth callback POST - grant_type: {grant_type}")
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logger.info(f"Code: {code[:20] if code else 'None'}...")
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logger.info(f"Client ID: {client_id}")
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logger.info(f"PKCE verifier: {bool(code_verifier)}")
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if grant_type != "authorization_code":
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return JSONResponse(
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status_code=400,
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content={"error": "unsupported_grant_type"}
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)
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if not code or not redirect_uri:
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return JSONResponse(
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status_code=400,
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content={"error": "invalid_request", "error_description": "Missing code or redirect_uri"}
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)
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try:
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# Validate authorization code
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if not code.startswith("clerk_auth_"):
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return JSONResponse(
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status_code=400,
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content={"error": "invalid_grant", "error_description": "Invalid authorization code"}
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)
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# TODO: In production, validate code against stored session
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# For now, we'll return a placeholder response
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# Generate or retrieve actual Clerk JWT token
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# This should be the actual JWT token from Clerk authentication
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return JSONResponse({
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"access_token": "PLACEHOLDER_CLERK_JWT_TOKEN",
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"token_type": "Bearer",
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"expires_in": 3600,
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"scope": "read search"
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})
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except Exception as e:
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logger.exception(f"OAuth callback POST failed: {e}")
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return JSONResponse(
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status_code=500,
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content={"error": "server_error", "error_description": str(e)}
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)
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@router.post("/token")
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async def token_endpoint(request: Request):
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"""OAuth 2.1 Token Endpoint - exchanges code for Clerk JWT"""
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# Parse form data
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form_data = await request.form()
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grant_type = form_data.get("grant_type")
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code = form_data.get("code")
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redirect_uri = form_data.get("redirect_uri")
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client_id = form_data.get("client_id")
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code_verifier = form_data.get("code_verifier")
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logger.info(f"Token exchange - grant_type: {grant_type}")
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logger.info(f"Code: {code[:20] if code else 'None'}...")
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if grant_type != "authorization_code":
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return JSONResponse(
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status_code=400,
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content={"error": "unsupported_grant_type"}
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)
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if not code or not redirect_uri:
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return JSONResponse(
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status_code=400,
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content={"error": "invalid_request", "error_description": "Missing code or redirect_uri"}
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)
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try:
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# Validate authorization code
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if not code.startswith("clerk_auth_"):
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return JSONResponse(
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status_code=400,
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content={"error": "invalid_grant", "error_description": "Invalid authorization code"}
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)
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# In a real implementation, you would:
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# 1. Validate the code against stored session
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# 2. Extract user info from the session
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# 3. Return the actual Clerk JWT token
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# For now, return a placeholder response
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return JSONResponse({
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"access_token": "PLACEHOLDER_USE_ACTUAL_CLERK_JWT_TOKEN",
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"token_type": "Bearer",
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"expires_in": 3600,
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"scope": "read search",
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"instructions": "Replace with actual Clerk JWT token from authentication flow"
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})
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except Exception as e:
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logger.exception(f"Token exchange failed: {e}")
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return JSONResponse(
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status_code=500,
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content={"error": "server_error", "error_description": str(e)}
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) |