101 lines
2.9 KiB
Python
101 lines
2.9 KiB
Python
"""
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[C-01] JWT Authentication Module
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Implement Bearer token authentication for API endpoints.
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"""
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import os
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from datetime import datetime, timedelta, timezone
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from typing import Optional
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from fastapi import Depends, HTTPException, status
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from fastapi.security import HTTPBearer
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from jose import JWTError, jwt
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from pydantic import BaseModel
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# Configuration
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SECRET_KEY = os.environ.get("JWT_SECRET_KEY")
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if not SECRET_KEY:
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# Generate fallback key for dev (NOT FOR PRODUCTION)
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import secrets
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SECRET_KEY = secrets.token_urlsafe(32)
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import sys
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print(f"[WARNING] JWT_SECRET_KEY not set. Generated ephemeral key: {SECRET_KEY[:20]}...", file=sys.stderr)
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ALGORITHM = "HS256"
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ACCESS_TOKEN_EXPIRE_MINUTES = 480 # 8 hours
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security = HTTPBearer()
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class TokenData(BaseModel):
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sub: int # user_id
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username: str
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role: str
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exp: datetime
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class TokenResponse(BaseModel):
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access_token: str
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token_type: str
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user_id: int
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username: str
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role: str
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def create_access_token(user_id: int, username: str, role: str, expires_delta: Optional[timedelta] = None):
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"""Create JWT token with expiration."""
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if expires_delta:
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expire = datetime.now(timezone.utc) + expires_delta
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else:
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expire = datetime.now(timezone.utc) + timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES)
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to_encode = {
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"sub": user_id,
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"username": username,
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"role": role,
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"exp": expire,
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"iat": datetime.now(timezone.utc)
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}
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encoded_jwt = jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
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return encoded_jwt
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async def get_current_user(credentials = Depends(security)):
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"""
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Dependency that validates JWT token from Authorization header.
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Returns TokenData with user_id, username, role.
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"""
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token = credentials.credentials
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try:
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payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
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user_id: int = payload.get("sub")
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username: str = payload.get("username")
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role: str = payload.get("role")
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if user_id is None or username is None:
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raise HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail="Invalid token claims"
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)
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token_data = TokenData(
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sub=user_id,
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username=username,
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role=role,
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exp=datetime.fromtimestamp(payload.get("exp"), tz=timezone.utc)
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)
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except JWTError:
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raise HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail="Invalid authentication credentials",
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headers={"WWW-Authenticate": "Bearer"},
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)
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return token_data
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async def get_current_admin(current_user: TokenData = Depends(get_current_user)):
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"""Dependency that checks if user has 'admin' role."""
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if current_user.role != "admin":
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raise HTTPException(
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status_code=status.HTTP_403_FORBIDDEN,
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detail="Admin role required"
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)
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return current_user
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