login.py

import bcrypt
from exrx.database import User
from exrx import app

@app.login_manager.user_loader
def load_user(user_id):
    return User.query.filter_by(id=int(user_id)).first()


def validate_and_get_user(username, password):
    user = User.query.filter_by(username=username).first()
    if(not user):
        return None
    if bcrypt.checkpw(bytes(password,"utf-8"), user.password_hash):
        return user
    else:
        return None