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JWT Authentication Middleware.
Task: 1.5
Spec: specs/features/authentication.md
"""
from fastapi import HTTPException, Depends, status
from fastapi.security import HTTPBearer
import jwt
import os
security = HTTPBearer()
# JWT Configuration
JWT_SECRET = os.getenv("JWT_SECRET", "your-secret-key-min-32-chars")
JWT_ALGORITHM = "HS256"
async def verify_token(credentials = Depends(security)) -> str:
"""
Verify JWT token and extract user_id.
Args:
credentials: HTTP Bearer credentials from request header
Returns:
str: user_id extracted from token payload
Raises:
HTTPException: 401 if token is invalid or expired
"""
token = credentials.credentials
try:
# Decode and verify JWT token
payload = jwt.decode(token, JWT_SECRET, algorithms=[JWT_ALGORITHM])
# Extract user_id from payload
user_id = payload.get("user_id")
if not user_id:
raise HTTPException(
status_code=status.HTTP_401_UNAUTHORIZED,
detail="Invalid token: user_id not found"
)
return user_id
except jwt.ExpiredSignatureError:
raise HTTPException(
status_code=status.HTTP_401_UNAUTHORIZED,
detail="Token expired. Please login again."
)
except jwt.InvalidTokenError:
raise HTTPException(
status_code=status.HTTP_401_UNAUTHORIZED,
detail="Invalid token. Please login again."
)
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