MongoDB 存储“承诺” object 而不是散列密码

Question

I am using bcrypt to hash passwords and MongoDB as my database.

Here is the code:

export default function buildMakeUser({pwdHasher})
{
    return function makeUser({
        username,
        email,
        password,
        password_hash = pwdHasher(password), // the important part
        favoriteColor
    } = {})
    {

// ...
        return Object.freeze({
            getUsername: () => username,
            getEmail: () => email,
            getHashedPassword: () => password_hash,
            getFavoriteColor: () => favoriteColor
        });
}

And here is pwdHasher 's definition:

import bcrypt from "bcrypt";
import buildMakeUser from "./entity/user.js";

async function pwdHasher(password){
    let hashed;
    hashed = await bcrypt.hash(password, 10);
    return hashed;
}

However, when I store the user in the database, here's the result:

  ops: [
    {
      username: 'kibe',
      email: 'blabla@gmail.com',
      password_hash: [Promise],
      _id: 5ecc8b752e0aa53e87d5b62a
    }
  ],

It seems like makeUser 's object does not wait for pwdHasher(password) . I have tried wrapping pwdHasher in a Promise and it also did not work.

Does anyone know why?

Thank you.

Answer 1

There are two solutions I see based on your code snippet:

First way: (Recommended)
Use await when calling the async function. The code will be:

export default function buildMakeUser({pwdHasher})
{
    return function makeUser({
        ...
        password_hash = await pwdHasher(password), // the important part 
        ...
    })  
}

Alternative way:
Use hashSync method of bcrypt instead of using async-await.

Answer 2

You have defined pwdHasher as:

async function pwdHasher(password) { ... }

But you call it as:

password_hash = pwdHasher(password),

By definition, an async function RETURNS A PROMISE. If you'd like to get the value from the promise, you must either await the result or use pwdHasher(password).then(...)