63 lines
2.1 KiB
Python
63 lines
2.1 KiB
Python
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
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from fastapi.security import OAuth2PasswordBearer
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from sqlalchemy.ext.asyncio import AsyncSession
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from sqlalchemy import select
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from app.core.config import settings
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from app.core.database import get_db
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from app.models.user import User
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pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
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oauth2_scheme = OAuth2PasswordBearer(tokenUrl="/api/auth/token")
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def verify_password(plain: str, hashed: str) -> bool:
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return pwd_context.verify(plain, hashed)
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def dummy_verify_password() -> None:
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"""Run a throwaway bcrypt verification so the username-not-found login path
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takes the same time as a real password check, preventing username
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enumeration via response-timing differences."""
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pwd_context.dummy_verify()
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def hash_password(password: str) -> str:
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return pwd_context.hash(password)
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def create_access_token(data: dict, expires_delta: Optional[timedelta] = None) -> str:
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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(minutes=settings.access_token_expire_minutes)
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)
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to_encode["exp"] = expire
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return jwt.encode(to_encode, settings.secret_key, algorithm=settings.algorithm)
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async def get_current_user(
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token: str = Depends(oauth2_scheme),
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db: AsyncSession = Depends(get_db),
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) -> User:
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credentials_exception = HTTPException(
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status_code=status.HTTP_401_UNAUTHORIZED,
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detail="Could not validate credentials",
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headers={"WWW-Authenticate": "Bearer"},
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)
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try:
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payload = jwt.decode(token, settings.secret_key, algorithms=[settings.algorithm])
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user_id: str = payload.get("sub")
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if user_id is None:
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raise credentials_exception
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except JWTError:
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raise credentials_exception
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result = await db.execute(select(User).where(User.id == int(user_id)))
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user = result.scalar_one_or_none()
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if user is None:
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raise credentials_exception
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return user
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