66 lines
2.2 KiB
Python
66 lines
2.2 KiB
Python
from datetime import datetime, timedelta
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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 OAuth2PasswordBearer, OAuth2PasswordRequestForm
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from jose import jwt, JWTError
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from passlib.context import CryptContext
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from sqlalchemy.orm import Session
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from .db import SessionLocal
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from . import models
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from .config import settings
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SECRET_KEY = settings.secret_key
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ALGORITHM = "HS256"
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ACCESS_TOKEN_EXPIRE_MINUTES = 60
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pwd_context = CryptContext(schemes=["bcrypt_sha256"], deprecated="auto")
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oauth2_scheme = OAuth2PasswordBearer(tokenUrl="/auth/token")
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def get_db():
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db = SessionLocal()
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try:
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yield db
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finally:
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db.close()
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def verify_password(plain_password, hashed_password):
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return pwd_context.verify(plain_password, hashed_password)
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def get_password_hash(password):
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return pwd_context.hash(password)
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def authenticate_user(db: Session, username: str, password: str) -> Optional[models.User]:
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user = db.query(models.User).filter(models.User.username == username).first()
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if not user or not verify_password(password, user.password_hash):
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return None
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return user
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def create_access_token(data: dict, expires_delta: Optional[timedelta] = None):
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to_encode = data.copy()
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expire = datetime.utcnow() + (expires_delta or timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES))
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to_encode.update({"exp": expire})
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return jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
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async def get_current_user(
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token: str = Depends(oauth2_scheme),
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db: Session = Depends(get_db),
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) -> models.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, SECRET_KEY, algorithms=[ALGORITHM])
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username: str | None = payload.get("preferred_username") or payload.get("sub")
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if username 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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user = db.query(models.User).filter(models.User.username == username).first()
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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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