108 lines
3.5 KiB
Python
108 lines
3.5 KiB
Python
"""
|
|
[C-01] JWT Authentication Module
|
|
Implement Bearer token authentication for API endpoints.
|
|
"""
|
|
import os
|
|
from datetime import datetime, timedelta, timezone
|
|
from typing import Optional
|
|
from fastapi import Depends, HTTPException, status
|
|
from fastapi.security import HTTPBearer
|
|
from jose import JWTError, jwt
|
|
from pydantic import BaseModel
|
|
from .config_loader import get_config
|
|
|
|
# Configuration
|
|
config = get_config()
|
|
SECRET_KEY = config.get("auth", {}).get("jwt_secret_key")
|
|
if not SECRET_KEY or SECRET_KEY == "change_me_in_production":
|
|
# Generate fallback key for dev (NOT FOR PRODUCTION)
|
|
import secrets
|
|
SECRET_KEY = secrets.token_urlsafe(32)
|
|
import sys
|
|
print(f"[WARNING] JWT_SECRET_KEY not set or default used. Generated ephemeral key: {SECRET_KEY[:20]}...", file=sys.stderr)
|
|
|
|
ALGORITHM = "HS256"
|
|
ACCESS_TOKEN_EXPIRE_MINUTES = 480 # 8 hours
|
|
|
|
security = HTTPBearer()
|
|
|
|
|
|
class TokenData(BaseModel):
|
|
sub: int # user_id
|
|
username: str
|
|
role: str
|
|
exp: datetime
|
|
|
|
|
|
class TokenResponse(BaseModel):
|
|
access_token: str
|
|
token_type: str
|
|
user_id: int
|
|
username: str
|
|
role: str
|
|
|
|
|
|
def create_access_token(user_id: int, username: str, role: str, expires_delta: Optional[timedelta] = None):
|
|
"""Create JWT token with expiration."""
|
|
if expires_delta:
|
|
expire = datetime.now(timezone.utc) + expires_delta
|
|
else:
|
|
expire = datetime.now(timezone.utc) + timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES)
|
|
|
|
to_encode = {
|
|
"sub": str(user_id), # JWT spec requires sub to be a string
|
|
"username": username,
|
|
"role": role,
|
|
"exp": expire,
|
|
"iat": datetime.now(timezone.utc)
|
|
}
|
|
encoded_jwt = jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
|
|
return encoded_jwt
|
|
|
|
|
|
async def get_current_user(credentials = Depends(security)):
|
|
"""
|
|
Dependency that validates JWT token from Authorization header.
|
|
Returns TokenData with user_id, username, role.
|
|
"""
|
|
token = credentials.credentials
|
|
import logging
|
|
log = logging.getLogger("ainventory")
|
|
log.debug(f"[AUTH] Validating token (first 10 chars): {token[:10] if token else 'None'}")
|
|
try:
|
|
payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
|
|
user_id: int = int(payload.get("sub")) # sub is stored as string, convert back to int
|
|
username: str = payload.get("username")
|
|
role: str = payload.get("role")
|
|
log.debug(f"[AUTH] Token valid — user_id={user_id}, username={username}, role={role}")
|
|
|
|
if user_id is None or username is None:
|
|
raise HTTPException(
|
|
status_code=status.HTTP_401_UNAUTHORIZED,
|
|
detail="Invalid token claims"
|
|
)
|
|
token_data = TokenData(
|
|
sub=user_id,
|
|
username=username,
|
|
role=role,
|
|
exp=datetime.fromtimestamp(payload.get("exp"), tz=timezone.utc)
|
|
)
|
|
except JWTError as e:
|
|
log.error(f"[AUTH] JWTError: {type(e).__name__}: {str(e)}")
|
|
raise HTTPException(
|
|
status_code=status.HTTP_401_UNAUTHORIZED,
|
|
detail="Invalid authentication credentials",
|
|
headers={"WWW-Authenticate": "Bearer"},
|
|
)
|
|
return token_data
|
|
|
|
|
|
async def get_current_admin(current_user: TokenData = Depends(get_current_user)):
|
|
"""Dependency that checks if user has 'admin' role."""
|
|
if current_user.role != "admin":
|
|
raise HTTPException(
|
|
status_code=status.HTTP_403_FORBIDDEN,
|
|
detail="Admin role required"
|
|
)
|
|
return current_user
|