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"""
Auth Middleware - Request authentication layer
Intercepts requests to validate JWT tokens and attach authenticated
user to request.state for use in route handlers.
"""
import logging
from fastapi import Request, HTTPException, status
from fastapi.responses import JSONResponse
from sqlalchemy import select
from sqlalchemy.ext.asyncio import AsyncSession
from starlette.middleware.base import BaseHTTPMiddleware
from core.database import async_session_maker
from core.models import User
from core.api_response import error_response, ErrorCode
from services.auth_service.config import AuthServiceConfig
from services.auth_service.jwt_provider import (
verify_access_token,
TokenExpiredError,
InvalidTokenError,
JWTError,
)
from services.base_service.middleware_chain import (
BaseServiceMiddleware,
get_request_context,
)
logger = logging.getLogger(__name__)
class AuthMiddleware(BaseServiceMiddleware):
"""
Authentication middleware for request validation.
Flow:
1. Check if route requires/allows auth based on URL
2. Extract Authorization header
3. Verify JWT token
4. Load user from database
5. Attach user to request.state.user
6. Continue to next middleware/route
Public routes skip all auth checks.
Required routes must have valid auth or return 401.
Optional routes attach user if auth is provided, but don't fail if missing.
"""
SERVICE_NAME = "auth"
async def dispatch(self, request: Request, call_next):
"""Process request through auth middleware."""
# Skip OPTIONS requests (CORS preflight)
if request.method == "OPTIONS":
return await call_next(request)
# Initialize request context
ctx = get_request_context(request)
# Get path and method from request
path = request.url.path
# Check if route is public (skip all auth)
if AuthServiceConfig.is_public(path):
self.log_request(request, "Public route, skipping auth")
request.state.user = None
ctx.user = None
ctx.is_authenticated = False
response = await call_next(request)
return response
# Check if route requires auth or allows optional auth
requires_auth = AuthServiceConfig.requires_auth(path)
allows_optional = AuthServiceConfig.allows_optional_auth(path)
# If route doesn't require auth and doesn't allow optional, skip
if not requires_auth and not allows_optional:
self.log_request(request, "Route not configured for auth, skipping")
request.state.user = None
ctx.user = None
ctx.is_authenticated = False
response = await call_next(request)
return response
# Extract Authorization header
auth_header = request.headers.get("Authorization")
# If no auth header
if not auth_header:
if requires_auth:
self.log_request(request, "Missing Authorization header (required)")
return JSONResponse(
status_code=status.HTTP_401_UNAUTHORIZED,
content=error_response(
ErrorCode.UNAUTHORIZED,
"Missing Authorization header"
),
headers={"WWW-Authenticate": "Bearer"},
)
else:
# Optional auth, no header provided
self.log_request(request, "No auth header (optional route)")
request.state.user = None
ctx.user = None
ctx.is_authenticated = False
response = await call_next(request)
return response
# Validate Authorization header format
if not auth_header.startswith("Bearer "):
if requires_auth:
self.log_request(request, "Invalid Authorization header format")
return JSONResponse(
status_code=status.HTTP_401_UNAUTHORIZED,
content=error_response(
ErrorCode.TOKEN_INVALID,
"Invalid Authorization header format. Use: Bearer <token>"
),
headers={"WWW-Authenticate": "Bearer"},
)
else:
# Optional auth, invalid format
request.state.user = None
ctx.user = None
ctx.is_authenticated = False
response = await call_next(request)
return response
# Extract token
token = auth_header.split(" ", 1)[1]
# Verify token
try:
payload = verify_access_token(token)
except TokenExpiredError:
if requires_auth:
self.log_request(request, "Token expired")
return JSONResponse(
status_code=status.HTTP_401_UNAUTHORIZED,
content=error_response(
ErrorCode.TOKEN_EXPIRED,
"Token has expired. Please sign in again."
),
headers={"WWW-Authenticate": "Bearer"},
)
else:
# Optional auth, expired token
request.state.user = None
ctx.user = None
ctx.is_authenticated = False
response = await call_next(request)
return response
except (InvalidTokenError, JWTError) as e:
if requires_auth:
self.log_error(request, f"Token verification failed: {e}")
return JSONResponse(
status_code=status.HTTP_401_UNAUTHORIZED,
content=error_response(
ErrorCode.TOKEN_INVALID,
f"Invalid token: {str(e)}"
),
headers={"WWW-Authenticate": "Bearer"},
)
else:
# Optional auth, invalid token
request.state.user = None
ctx.user = None
ctx.is_authenticated = False
response = await call_next(request)
return response
# Get database session
async with async_session_maker() as db:
try:
# Load user from database
query = select(User).where(
User.user_id == payload.user_id,
User.is_active == True
)
result = await db.execute(query)
user = result.scalar_one_or_none()
if not user:
if requires_auth:
self.log_request(request, "User not found or inactive")
return JSONResponse(
status_code=status.HTTP_401_UNAUTHORIZED,
content=error_response(
ErrorCode.USER_NOT_FOUND,
"User not found or inactive"
),
)
else:
# Optional auth, user not found
request.state.user = None
ctx.user = None
ctx.is_authenticated = False
response = await call_next(request)
return response
if payload.token_version < user.token_version:
if requires_auth:
self.log_request(
request,
f"Token invalidated (version {payload.token_version} < {user.token_version})"
)
return JSONResponse(
status_code=status.HTTP_401_UNAUTHORIZED,
content=error_response(
ErrorCode.TOKEN_INVALID,
"Token has been invalidated. Please sign in again."
),
headers={"WWW-Authenticate": "Bearer"},
)
else:
# Optional auth, invalidated token
request.state.user = None
ctx.user = None
ctx.is_authenticated = False
response = await call_next(request)
return response
# Attach user to request state
request.state.user = user
ctx.set_user(user)
# Check if user is admin
is_admin = AuthServiceConfig.is_admin(user.email)
request.state.is_admin = is_admin
ctx.set_flag('is_admin', is_admin)
self.log_request(request, f"Authenticated user: {user.user_id}")
# Continue to next middleware/route
response = await call_next(request)
return response
finally:
await db.close()
__all__ = ['AuthMiddleware']
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