fastapi_google_authentication_user_functions.py

def get_user_by_email(db, email: str):
    for username, value in db.items():
        if value.get("email") == email:
            user_dict = db[username]
            return User(**user_dict)


def authenticate_user_email(fake_db, email: str):
    user = get_user_by_email(fake_db, email)
    if not user:
        return False
    return user


def create_access_token(*, data: dict, expires_delta: timedelta = 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(token: str = Depends(oauth2_scheme)):
    credentials_exception = HTTPException(
        status_code=HTTP_403_FORBIDDEN, detail="Could not validate credentials"
    )
    try:
        payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
        email: str = payload.get("sub")
        if email is None:
            raise credentials_exception
        token_data = TokenData(email=email)
    except PyJWTError:
        raise credentials_exception
    user = get_user_by_email(fake_users_db, email=token_data.email)
    if user is None:
        raise credentials_exception
    return user


async def get_current_active_user(current_user: User = Depends(get_current_user)):
    if current_user.disabled:
        raise HTTPException(status_code=400, detail="Inactive user")
    return current_user