refactoring - 1

back/auth_utils.py

@@ -0,0 +1,97 @@
+from datetime import datetime, timedelta
+from typing import Annotated, Union
+
+from fastapi import Depends, HTTPException, status
+from fastapi.security import OAuth2PasswordBearer
+from jose import JWTError, jwt
+from passlib.context import CryptContext
+from sqlalchemy.orm import Session
+
+from .db import database
+from . import orm_models, pydantic_schemas
+
+
+SECRET_KEY = "651a52941cf5de14d48ef5d7af115709"
+ALGORITHM = "HS256"
+ACCESS_TOKEN_EXPIRE_MINUTES = 1440
+pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
+oauth2_scheme = OAuth2PasswordBearer(tokenUrl="/api/token")
+
+
+def get_db():
+    db = database
+    try:
+        yield db
+    finally:
+        db.close()
+
+
+def verify_password(plain_password, hashed_password):
+    return pwd_context.verify(plain_password, hashed_password)
+
+
+def get_password_hash(password):
+    return pwd_context.hash(password)
+
+
+def get_user_by_nickname(db: Annotated[Session, Depends(get_db)], nickname: str):
+    user_with_required_id = db.query(orm_models.User).filter(orm_models.User.nickname == nickname).first()
+    if user_with_required_id:
+        return user_with_required_id
+    return None
+
+
+def get_user_by_id(db: Annotated[Session, Depends(get_db)], user_id: int):
+    user_with_required_id = db.query(orm_models.User).filter(orm_models.User.id == user_id).first()
+    if user_with_required_id:
+        return user_with_required_id
+    return None
+    
+
+def authenticate_user(db: Annotated[Session, Depends(get_db)], nickname: str, password: str):
+    user = get_user_by_nickname(db=db, nickname=nickname)
+    if not user:
+        return False
+    if not verify_password(password, user.hashed_password):
+        return False
+    return user
+
+
+def create_access_token(data: dict, expires_delta: Union[timedelta, None] = None):
+    to_encode = data.copy()
+    if expires_delta:
+        expire = datetime.utcnow() + expires_delta
+    else:
+        expire = datetime.utcnow() + timedelta(minutes=15)
+    to_encode.update({"exp": expire})
+    encoded_jwt = jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
+    return encoded_jwt
+
+
+async def get_current_user(db: Annotated[Session, Depends(get_db)], token: Annotated[str, Depends(oauth2_scheme)]):
+    credentials_exception = HTTPException(
+        status_code=status.HTTP_401_UNAUTHORIZED,
+        detail="Could not validate credentials",
+        headers={"WWW-Authenticate": "Bearer"},
+    )
+    try:
+        payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
+        user_id: int = payload.get("user_id")
+        if user_id is None:
+            raise credentials_exception
+        token_data = pydantic_schemas.TokenData(user_id=user_id)
+    except JWTError:
+        raise credentials_exception
+    user = get_user_by_id(db, user_id=token_data.user_id)
+    if user is None:
+        raise credentials_exception
+    return pydantic_schemas.User(id=user.id, nickname=user.nickname, name=user.name, surname=user.surname,
+        disabled=user.disabled, items=user.announcements, reg_date=user.reg_date, points=user.points)
+
+
+async def get_current_active_user(
+    current_user: Annotated[pydantic_schemas.User, Depends(get_current_user)]
+):
+    if current_user.disabled:
+        raise HTTPException(status_code=400, detail="Inactive user")
+    return current_user