Implementation Engineer
78 lines
2.5 KiB
Python
78 lines
2.5 KiB
Python
"""JWT authentication helpers."""
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from datetime import datetime, timedelta, timezone
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from typing import Optional
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from jose import JWTError, jwt
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from passlib.context import CryptContext
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from fastapi import Depends, HTTPException, status, Request
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from sqlalchemy.ext.asyncio import AsyncSession
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from sqlalchemy import select
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from app.config import get_settings
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from app.database import get_db
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from app.models.admin_user import AdminUser
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settings = get_settings()
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pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
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def verify_password(plain_password: str, hashed_password: str) -> bool:
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"""Verify a plain password against a hash."""
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return pwd_context.verify(plain_password, hashed_password)
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def get_password_hash(password: str) -> str:
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"""Hash a password using bcrypt."""
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return pwd_context.hash(password)
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def create_access_token(data: dict, expires_delta: timedelta | None = None) -> str:
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"""Create a JWT access token."""
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to_encode = data.copy()
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expire = datetime.now(timezone.utc) + (
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expires_delta or timedelta(hours=settings.jwt_expire_hours)
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)
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to_encode.update({"exp": expire})
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return jwt.encode(to_encode, settings.jwt_secret, algorithm=settings.jwt_algorithm)
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def verify_token(token: str) -> dict | None:
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"""Verify a JWT token and return its payload."""
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try:
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payload = jwt.decode(token, settings.jwt_secret, algorithms=[settings.jwt_algorithm])
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return payload
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except JWTError:
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return None
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async def get_current_user(
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request: Request,
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db: AsyncSession = Depends(get_db),
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) -> AdminUser:
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"""Dependency: extract JWT from cookie, verify, return AdminUser."""
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token = request.cookies.get("hms_admin_token")
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if not token:
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raise HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail="Not authenticated",
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)
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payload = verify_token(token)
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if not payload:
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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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)
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username = payload.get("sub")
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if not username:
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raise HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail="Invalid token payload",
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)
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result = await db.execute(select(AdminUser).where(AdminUser.username == username))
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user = result.scalar_one_or_none()
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if not user:
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raise HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail="User not found",
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)
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return user
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