73 lines
2.2 KiB
Python
73 lines
2.2 KiB
Python
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"""JWT authentication for admin routes."""
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from __future__ import annotations
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import logging
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import os
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import secrets
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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 HTTPAuthorizationCredentials, HTTPBearer
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from jose import JWTError, jwt
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from passlib.context import CryptContext
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logger = logging.getLogger(__name__)
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JWT_SECRET = os.getenv("JWT_SECRET") or secrets.token_urlsafe(32)
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JWT_ALGORITHM = "HS256"
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JWT_EXPIRE_HOURS = 24
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pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
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bearer_scheme = HTTPBearer(auto_error=False)
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def hash_password(password: str) -> str:
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"""Hash a plain-text password with bcrypt."""
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return pwd_context.hash(password)
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def verify_password(plain: str, hashed: str) -> bool:
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"""Verify a plain-text password against its bcrypt hash."""
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return pwd_context.verify(plain, hashed)
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def create_access_token(subject: str) -> str:
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"""Create a JWT access token for the given subject (username)."""
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expire = datetime.now(timezone.utc) + timedelta(hours=JWT_EXPIRE_HOURS)
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return jwt.encode(
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{"sub": subject, "exp": expire},
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JWT_SECRET,
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algorithm=JWT_ALGORITHM,
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)
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async def require_admin(
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credentials: Optional[HTTPAuthorizationCredentials] = Depends(bearer_scheme),
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) -> str:
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"""FastAPI dependency that validates the JWT and returns the username.
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Use as: ``admin_user: str = Depends(require_admin)``
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"""
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if credentials is None:
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raise HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail="Authentication required",
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headers={"WWW-Authenticate": "Bearer"},
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)
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token = credentials.credentials
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try:
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payload = jwt.decode(token, JWT_SECRET, algorithms=[JWT_ALGORITHM])
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username: Optional[str] = payload.get("sub")
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if username is None:
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raise HTTPException(status_code=401, detail="Invalid token payload")
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return username
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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 or expired token",
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headers={"WWW-Authenticate": "Bearer"},
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)
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