from passlib.context import CryptContext from sqlalchemy.ext.asyncio import AsyncSession from sqlalchemy.ext.asyncio import async_sessionmaker from jose import JWTError, jwt from fastapi.security import OAuth2PasswordBearer from fastapi import Depends, FastAPI, HTTPException from fastapi_users.password import PasswordHelper from sqlalchemy.ext.asyncio import async_sessionmaker from typing import AsyncGenerator, Dict, Annotated, Optional from datetime import datetime, timedelta from .settings import Settings from .domain.user import User from .db import get_session pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto") oauth2_scheme = OAuth2PasswordBearer(tokenUrl="api/token") settings = Settings() password_helper = PasswordHelper(pwd_context) AsyncSessionDependency = Annotated[async_sessionmaker, Depends(get_session)] TokenDependency = Annotated[str, Depends(oauth2_scheme)] def verify_password(plain_password: str, hashed_password: str) -> bool: return pwd_context.verify(plain_password, hashed_password) def get_password_hash(password: str) -> str: return pwd_context.hash(password) async def authenticate_user( session: AsyncSession, username: str, password: str ) -> AsyncGenerator[User, None]: user = await User.get_by_username(session, username) if not user: return None if not verify_password(password, user.hashed_password): return None return user def create_access_token(user: User): expire = datetime.utcnow() + timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES) to_encode = { "sub": user.username, "exp": expire, } encoded_jwt = jwt.encode( to_encode, settings.SECRET_KEY, algorithm=settings.ALGORITHM ) return encoded_jwt async def get_current_user( session: AsyncSessionDependency, token: TokenDependency ) -> User: async with session() as session: try: payload = jwt.decode( token, settings.SECRET_KEY, algorithms=[settings.ALGORITHM] ) username: str = payload.get("sub") if username is None: raise HTTPException(status_code=401, detail="Unathorized") except JWTError: raise HTTPException(status_code=401, detail="Unathorized") return await User.get_by_username(session, username)