605 lines
27 KiB
Python
605 lines
27 KiB
Python
"""Authentication middleware for ALwrity backend."""
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import os
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import inspect
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from typing import Optional, Dict, Any
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from fastapi import HTTPException, Depends, status, Request, Query
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from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
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from loguru import logger
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from dotenv import load_dotenv
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# Try to import fastapi-clerk-auth, fallback to custom implementation
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try:
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from fastapi_clerk_auth import ClerkHTTPBearer, ClerkConfig
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CLERK_AUTH_AVAILABLE = True
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except ImportError:
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CLERK_AUTH_AVAILABLE = False
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logger.warning("fastapi-clerk-auth not available, using custom implementation")
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# Load environment variables from the correct path
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# Get the backend directory path (parent of middleware directory)
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_backend_dir = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
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_env_path = os.path.join(_backend_dir, ".env")
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load_dotenv(_env_path, override=False) # Don't override if already loaded
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# Initialize security scheme
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security = HTTPBearer(auto_error=False)
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class ClerkAuthMiddleware:
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"""Clerk authentication middleware using fastapi-clerk-auth or custom implementation."""
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def __init__(self):
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"""Initialize Clerk authentication middleware."""
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self.clerk_secret_key = os.getenv('CLERK_SECRET_KEY', '').strip()
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# Check for both backend and frontend naming conventions
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publishable_key = (
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os.getenv('CLERK_PUBLISHABLE_KEY') or
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os.getenv('REACT_APP_CLERK_PUBLISHABLE_KEY', '')
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)
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self.clerk_publishable_key = publishable_key.strip() if publishable_key else None
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self.disable_auth = os.getenv('DISABLE_AUTH', 'false').lower() == 'true'
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self.environment = (os.getenv('ENVIRONMENT') or os.getenv('APP_ENV') or 'development').strip().lower()
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self.is_production = self.environment in {'prod', 'production'}
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allow_unverified_raw = os.getenv('ALLOW_UNVERIFIED_JWT_DEV')
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if allow_unverified_raw is None:
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# Safe default: allow unverified fallback only outside production unless explicitly overridden.
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self.allow_unverified_dev = not self.is_production
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else:
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self.allow_unverified_dev = allow_unverified_raw.lower() == 'true'
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# Cache for PyJWKClient to avoid repeated JWKS fetches
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self._jwks_client_cache = {}
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self._jwks_url_cache = None
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if not self.clerk_secret_key and not self.disable_auth:
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logger.warning("CLERK_SECRET_KEY not found, authentication may fail")
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# Initialize fastapi-clerk-auth if available
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if CLERK_AUTH_AVAILABLE and not self.disable_auth:
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try:
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if self.clerk_secret_key and self.clerk_publishable_key:
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# Extract instance from publishable key for JWKS URL
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# Format: pk_test_<instance>.<domain> or pk_live_<instance>.<domain>
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parts = self.clerk_publishable_key.replace('pk_test_', '').replace('pk_live_', '').split('.')
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if len(parts) >= 1:
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# Extract the domain from publishable key or use default
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# Clerk URLs are typically: https://<instance>.clerk.accounts.dev
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instance = parts[0]
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jwks_url = f"https://{instance}.clerk.accounts.dev/.well-known/jwks.json"
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# Create Clerk configuration with JWKS URL
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clerk_config = ClerkConfig(
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secret_key=self.clerk_secret_key,
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jwks_url=jwks_url
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)
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# Create ClerkHTTPBearer instance for dependency injection
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self.clerk_bearer = ClerkHTTPBearer(clerk_config)
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logger.info(f"fastapi-clerk-auth initialized successfully with JWKS URL: {jwks_url}")
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self._jwks_url_cache = jwks_url
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else:
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logger.warning("Could not extract instance from publishable key")
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self.clerk_bearer = None
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else:
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logger.warning("CLERK_SECRET_KEY or CLERK_PUBLISHABLE_KEY not found")
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self.clerk_bearer = None
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except Exception as e:
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logger.error(f"Failed to initialize fastapi-clerk-auth: {e}")
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self.clerk_bearer = None
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else:
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self.clerk_bearer = None
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logger.info(
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f"ClerkAuthMiddleware initialized - env={self.environment}, "
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f"auth_disabled={self.disable_auth}, allow_unverified_dev={self.allow_unverified_dev}, "
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f"fastapi-clerk-auth={CLERK_AUTH_AVAILABLE}"
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)
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async def verify_token(self, token: str) -> Optional[Dict[str, Any]]:
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"""Verify Clerk JWT using fastapi-clerk-auth or custom implementation."""
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try:
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if self.disable_auth:
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logger.info("Authentication disabled, returning mock user")
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return {
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'id': 'mock_user_id',
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'email': 'mock@example.com',
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'first_name': 'Mock',
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'last_name': 'User',
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'clerk_user_id': 'mock_clerk_user_id'
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}
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if not self.clerk_secret_key:
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logger.error("CLERK_SECRET_KEY not configured")
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return None
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# Use fastapi-clerk-auth if available
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if self.clerk_bearer:
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try:
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# Decode and verify the JWT token
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import jwt
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from jwt import PyJWKClient
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# Get the JWKS URL from the token header
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unverified_header = jwt.get_unverified_header(token)
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# Decode token to get issuer for JWKS URL
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unverified_claims = jwt.decode(token, options={"verify_signature": False})
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issuer = unverified_claims.get('iss', '')
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# Construct JWKS URL from issuer
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jwks_url = f"{issuer}/.well-known/jwks.json" if issuer else self._jwks_url_cache or ""
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if not jwks_url:
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raise Exception("Unable to resolve JWKS URL for Clerk verification")
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# Use cached PyJWKClient to avoid repeated JWKS fetches
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if jwks_url not in self._jwks_client_cache:
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logger.info(f"Creating new PyJWKClient for {jwks_url} with caching enabled")
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# Create client with caching enabled (cache_keys=True keeps keys in memory)
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self._jwks_client_cache[jwks_url] = PyJWKClient(
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jwks_url,
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cache_keys=True,
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max_cached_keys=16
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)
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jwks_client = self._jwks_client_cache[jwks_url]
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signing_key = jwks_client.get_signing_key_from_jwt(token)
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# Verify and decode the token with clock skew tolerance
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# Add 300 seconds (5 minutes) leeway to handle clock skew and token refresh delays
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decoded_token = jwt.decode(
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token,
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signing_key.key,
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algorithms=["RS256"],
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options={"verify_signature": True, "verify_exp": True},
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leeway=300 # Allow 5 minutes leeway for token refresh during navigation
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)
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# Extract user information
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user_id = decoded_token.get('sub')
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email = decoded_token.get('email')
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first_name = decoded_token.get('first_name') or decoded_token.get('given_name')
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last_name = decoded_token.get('last_name') or decoded_token.get('family_name')
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if user_id:
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logger.info(f"Token verified successfully using fastapi-clerk-auth for user: {email} (ID: {user_id})")
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return {
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'id': user_id,
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'email': email,
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'first_name': first_name,
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'last_name': last_name,
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'clerk_user_id': user_id
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}
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else:
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logger.warning("No user ID found in verified token")
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return None
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except Exception as e:
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# Expired tokens are expected - log at debug level to reduce noise
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error_msg = str(e).lower()
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if 'expired' in error_msg or 'signature has expired' in error_msg:
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logger.debug(f"Token expired (expected): {e}")
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else:
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logger.warning(f"fastapi-clerk-auth verification error: {e}. Attempting fallback decoding.")
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# Fallback to unverified decoding on verification failure (DEV MODE ONLY)
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try:
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import jwt
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# Decode the JWT without verification to get claims
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decoded_token = jwt.decode(token, options={"verify_signature": False}, leeway=300)
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user_id = decoded_token.get('sub')
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email = decoded_token.get('email')
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first_name = decoded_token.get('first_name') or decoded_token.get('given_name')
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last_name = decoded_token.get('last_name') or decoded_token.get('family_name')
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if user_id and self.allow_unverified_dev:
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logger.debug(f"Unverified token accepted (dev) for user: {email or 'unknown'} (ID: {user_id})")
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return {
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'id': user_id,
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'email': email,
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'first_name': first_name,
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'last_name': last_name,
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'clerk_user_id': user_id
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}
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elif user_id and not self.allow_unverified_dev:
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logger.error(f"Unverified token rejected (env={self.environment}).")
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return None
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except Exception as fallback_e:
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logger.warning(f"Fallback decoding failed: {fallback_e}")
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return None
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else:
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# Fallback to custom implementation (not secure for production)
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logger.debug("Using fallback JWT decoding without signature verification")
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try:
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import jwt
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# Decode the JWT without verification to get claims
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# This is NOT secure for production - only for development
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# Add leeway to handle clock skew
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decoded_token = jwt.decode(
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token,
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options={"verify_signature": False},
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leeway=300 # Allow 5 minutes leeway for token refresh
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)
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# Extract user information from the token
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user_id = decoded_token.get('sub') or decoded_token.get('user_id')
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email = decoded_token.get('email')
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first_name = decoded_token.get('first_name')
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last_name = decoded_token.get('last_name')
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if not user_id:
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logger.warning("No user ID found in token")
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return None
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if self.allow_unverified_dev:
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logger.debug(f"Token decoded successfully (fallback dev) for user: {email} (ID: {user_id})")
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return {
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'id': user_id,
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'email': email,
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'first_name': first_name,
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'last_name': last_name,
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'clerk_user_id': user_id
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}
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# In production mode, treat fallback as a soft failure:
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# log at warning level (once per process) and let the caller
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# handle this as an authentication failure without spamming logs.
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logger.warning("Fallback decoding is disabled in production.")
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return None
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except Exception as e:
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logger.warning(f"Fallback JWT decode error: {e}")
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return None
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except Exception as e:
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logger.error(f"Token verification error: {e}")
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return None
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# Initialize middleware
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clerk_auth = ClerkAuthMiddleware()
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async def get_current_user(
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request: Request,
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credentials: Optional[HTTPAuthorizationCredentials] = Depends(security)
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) -> Dict[str, Any]:
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"""Get current authenticated user."""
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try:
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# Safe header access
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auth_header = None
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user_agent = "unknown"
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all_headers = {}
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try:
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if hasattr(request, 'headers'):
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if hasattr(request.headers, 'get'):
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auth_header = request.headers.get('authorization') or request.headers.get('Authorization')
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user_agent = request.headers.get('user-agent', 'unknown')
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if hasattr(request.headers, 'items'):
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all_headers = {k: v[:50] if len(v) > 50 else v for k, v in request.headers.items()}
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except:
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pass
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if not credentials:
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# CRITICAL: Log as ERROR since this is a security issue - authenticated endpoint accessed without credentials
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endpoint_path = f"{request.method} {request.url.path}"
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logger.error(
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f"🔒 AUTHENTICATION ERROR: No credentials provided for authenticated endpoint: {endpoint_path} "
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f"(client_ip={request.client.host if request.client else 'unknown'}, "
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f"auth_header_received={'YES' if auth_header else 'NO'}, "
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f"auth_header_value={auth_header[:50] + '...' if auth_header and len(auth_header) > 50 else (auth_header or 'None')}, "
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f"all_headers={list(all_headers.keys())}, "
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f"user_agent={user_agent})"
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)
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# Get caller information for better debugging
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caller_frame = inspect.currentframe()
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caller_info = "unknown"
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if caller_frame:
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try:
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# Go up the stack to find the actual endpoint function
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frame = caller_frame.f_back
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if frame:
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# Look for the FastAPI endpoint (usually 2-3 frames up)
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for _ in range(5): # Check up to 5 frames
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if frame:
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func_name = frame.f_code.co_name
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module_name = frame.f_globals.get('__name__', 'unknown')
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# Skip FastAPI internal frames
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if 'fastapi' not in module_name.lower() and 'middleware' not in module_name.lower():
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caller_info = f"{module_name}.{func_name}"
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break
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frame = frame.f_back
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except Exception:
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pass # If we can't get caller info, continue with unknown
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# If we received an auth header but HTTPBearer didn't extract it, try manual extraction
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if auth_header and auth_header.startswith('Bearer '):
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logger.warning(
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f"⚠️ WARNING: Authorization header received but HTTPBearer didn't extract it. "
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f"Trying manual extraction for endpoint: {endpoint_path}"
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)
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# Try to extract token manually
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token = auth_header.replace('Bearer ', '').strip()
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if token:
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user = await clerk_auth.verify_token(token)
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if user:
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logger.info(f"✅ Manual token extraction successful for endpoint: {endpoint_path}")
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return user
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raise HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail="Not authenticated",
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headers={"WWW-Authenticate": "Bearer"},
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)
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token = credentials.credentials
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user = await clerk_auth.verify_token(token)
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if not user:
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# Token verification failed - log with endpoint context for debugging
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endpoint_path = f"{request.method} {request.url.path}"
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# Get caller information
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caller_frame = inspect.currentframe()
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caller_info = "unknown"
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if caller_frame:
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try:
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frame = caller_frame.f_back
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if frame:
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for _ in range(5):
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if frame:
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func_name = frame.f_code.co_name
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module_name = frame.f_globals.get('__name__', 'unknown')
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if 'fastapi' not in module_name.lower() and 'middleware' not in module_name.lower():
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caller_info = f"{module_name}.{func_name}"
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break
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frame = frame.f_back
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except Exception:
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pass
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# Safe header access for logging
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safe_user_agent = "unknown"
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try:
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if hasattr(request, 'headers') and hasattr(request.headers, 'get'):
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safe_user_agent = request.headers.get('user-agent', 'unknown')
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except:
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pass
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logger.error(
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f"🔒 AUTHENTICATION ERROR: Token verification failed for endpoint: {endpoint_path} "
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f"(client_ip={request.client.host if request.client else 'unknown'}, "
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f"caller={caller_info}, "
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f"user_agent={safe_user_agent})"
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)
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raise HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail="Authentication failed",
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headers={"WWW-Authenticate": "Bearer"},
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)
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return user
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except HTTPException:
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raise
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except Exception as e:
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endpoint_path = f"{request.method} {request.url.path}"
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# Get caller information
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caller_frame = inspect.currentframe()
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caller_info = "unknown"
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if caller_frame:
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try:
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frame = caller_frame.f_back
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if frame:
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for _ in range(5):
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if frame:
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func_name = frame.f_code.co_name
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module_name = frame.f_globals.get('__name__', 'unknown')
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if 'fastapi' not in module_name.lower() and 'middleware' not in module_name.lower():
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caller_info = f"{module_name}.{func_name}"
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break
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frame = frame.f_back
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except Exception:
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pass
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logger.error(
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f"🔒 AUTHENTICATION ERROR: Unexpected error during authentication for endpoint: {endpoint_path}: {e} "
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f"(client_ip={request.client.host if request.client else 'unknown'}, "
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f"caller={caller_info}, "
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f"user_agent={user_agent})",
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exc_info=True
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)
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raise HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail="Authentication failed",
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headers={"WWW-Authenticate": "Bearer"},
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)
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async def get_optional_user(
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credentials: Optional[HTTPAuthorizationCredentials] = Depends(security)
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) -> Optional[Dict[str, Any]]:
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"""Get current user if authenticated, otherwise return None."""
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try:
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if not credentials:
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return None
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token = credentials.credentials
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user = await clerk_auth.verify_token(token)
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return user
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except Exception as e:
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logger.warning(f"Optional authentication failed: {e}")
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return None
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async def get_current_user_with_query_token(
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request: Request,
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credentials: Optional[HTTPAuthorizationCredentials] = Depends(security)
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) -> Dict[str, Any]:
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"""Get current authenticated user from either Authorization header or query parameter.
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This is useful for media endpoints (audio, video, images) that need to be accessed
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by HTML elements like <audio> or <img> which cannot send custom headers.
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Args:
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request: FastAPI request object
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credentials: HTTP authorization credentials from header
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Returns:
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User dictionary with authentication info
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Raises:
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HTTPException: If authentication fails
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"""
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try:
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# Try to get token from Authorization header first
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token_to_verify = None
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if credentials:
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token_to_verify = credentials.credentials
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else:
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# Fall back to query parameter if no header
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query_token = None
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try:
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if hasattr(request, 'query_params') and hasattr(request.query_params, 'get'):
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query_token = request.query_params.get("token")
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except:
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pass
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if query_token:
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token_to_verify = query_token
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if not token_to_verify:
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# CRITICAL: Log as ERROR since this is a security issue
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endpoint_path = f"{request.method} {request.url.path}"
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# Safe user agent access
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user_agent = "unknown"
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try:
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if hasattr(request, 'headers') and hasattr(request.headers, 'get'):
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user_agent = request.headers.get('user-agent', 'unknown')
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except:
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pass
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|
|
# Get caller information
|
|
caller_frame = inspect.currentframe()
|
|
caller_info = "unknown"
|
|
if caller_frame:
|
|
try:
|
|
frame = caller_frame.f_back
|
|
if frame:
|
|
for _ in range(5):
|
|
if frame:
|
|
func_name = frame.f_code.co_name
|
|
module_name = frame.f_globals.get('__name__', 'unknown')
|
|
if 'fastapi' not in module_name.lower() and 'middleware' not in module_name.lower():
|
|
caller_info = f"{module_name}.{func_name}"
|
|
break
|
|
frame = frame.f_back
|
|
except Exception:
|
|
pass
|
|
|
|
# Safe header access for logging
|
|
safe_user_agent = "unknown"
|
|
try:
|
|
if hasattr(request, 'headers') and hasattr(request.headers, 'get'):
|
|
safe_user_agent = request.headers.get('user-agent', 'unknown')
|
|
except:
|
|
pass
|
|
|
|
logger.error(
|
|
f"🔒 AUTHENTICATION ERROR: No credentials provided (neither header nor query parameter) "
|
|
f"for authenticated endpoint: {endpoint_path} "
|
|
f"(client_ip={request.client.host if request.client else 'unknown'}, "
|
|
f"caller={caller_info}, "
|
|
f"user_agent={safe_user_agent})"
|
|
)
|
|
raise HTTPException(
|
|
status_code=status.HTTP_401_UNAUTHORIZED,
|
|
detail="Not authenticated",
|
|
headers={"WWW-Authenticate": "Bearer"},
|
|
)
|
|
|
|
user = await clerk_auth.verify_token(token_to_verify)
|
|
if not user:
|
|
# Token verification failed - log with endpoint context
|
|
endpoint_path = f"{request.method} {request.url.path}"
|
|
|
|
# Get caller information
|
|
caller_frame = inspect.currentframe()
|
|
caller_info = "unknown"
|
|
if caller_frame:
|
|
try:
|
|
frame = caller_frame.f_back
|
|
if frame:
|
|
for _ in range(5):
|
|
if frame:
|
|
func_name = frame.f_code.co_name
|
|
module_name = frame.f_globals.get('__name__', 'unknown')
|
|
if 'fastapi' not in module_name.lower() and 'middleware' not in module_name.lower():
|
|
caller_info = f"{module_name}.{func_name}"
|
|
break
|
|
frame = frame.f_back
|
|
except Exception:
|
|
pass
|
|
|
|
# Safe header access for logging
|
|
safe_user_agent = "unknown"
|
|
try:
|
|
if hasattr(request, 'headers') and hasattr(request.headers, 'get'):
|
|
safe_user_agent = request.headers.get('user-agent', 'unknown')
|
|
except:
|
|
pass
|
|
|
|
logger.error(
|
|
f"🔒 AUTHENTICATION ERROR: Token verification failed for endpoint: {endpoint_path} "
|
|
f"(client_ip={request.client.host if request.client else 'unknown'}, "
|
|
f"caller={caller_info}, "
|
|
f"user_agent={safe_user_agent})"
|
|
)
|
|
raise HTTPException(
|
|
status_code=status.HTTP_401_UNAUTHORIZED,
|
|
detail="Authentication failed",
|
|
headers={"WWW-Authenticate": "Bearer"},
|
|
)
|
|
|
|
return user
|
|
|
|
except HTTPException:
|
|
raise
|
|
except Exception as e:
|
|
endpoint_path = f"{request.method} {request.url.path}"
|
|
|
|
# Get caller information
|
|
caller_frame = inspect.currentframe()
|
|
caller_info = "unknown"
|
|
if caller_frame:
|
|
try:
|
|
frame = caller_frame.f_back
|
|
if frame:
|
|
for _ in range(5):
|
|
if frame:
|
|
func_name = frame.f_code.co_name
|
|
module_name = frame.f_globals.get('__name__', 'unknown')
|
|
if 'fastapi' not in module_name.lower() and 'middleware' not in module_name.lower():
|
|
caller_info = f"{module_name}.{func_name}"
|
|
break
|
|
frame = frame.f_back
|
|
except Exception:
|
|
pass
|
|
|
|
# Safe header access for logging
|
|
safe_user_agent = "unknown"
|
|
try:
|
|
if hasattr(request, 'headers') and hasattr(request.headers, 'get'):
|
|
safe_user_agent = request.headers.get('user-agent', 'unknown')
|
|
except:
|
|
pass
|
|
|
|
logger.error(
|
|
f"🔒 AUTHENTICATION ERROR: Unexpected error during authentication for endpoint: {endpoint_path}: {e} "
|
|
f"(client_ip={request.client.host if request.client else 'unknown'}, "
|
|
f"caller={caller_info}, "
|
|
f"user_agent={safe_user_agent})",
|
|
exc_info=True
|
|
)
|
|
raise HTTPException(
|
|
status_code=status.HTTP_401_UNAUTHORIZED,
|
|
detail="Authentication failed",
|
|
headers={"WWW-Authenticate": "Bearer"},
|
|
)
|