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Khumpol / Tay

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Task Tile #2

Open Khumpol opened 7 months ago

Khumpol commented 7 months ago

What - description of what you me to do Example: Hey @autopilot implement a Google sign-in on my website. Make changes to the front end and the back end of the application

Why - explain why this is important Example: I want to allow users to signup and login using their Google account

codeautopilot[bot] commented 7 months ago

Potential solution

To implement Google sign-in functionality, we need to update the backend to handle authentication with Google and create or update user records accordingly. On the frontend, we need to provide a way for users to initiate the Google sign-in process and handle the response.

How to implement

Backend (backend/userModel.js and backend/authController.js)

  1. Update the userModel.js to include fields for storing Google user information.
  2. Implement Google OAuth 2.0 in authController.js to verify the token received from the frontend and create or update the user record in the database.
  3. Generate a session token or JWT for the user to maintain their session.

backend/userModel.js

const mongoose = require('mongoose');

const userSchema = new mongoose.Schema({
  googleId: { type: String, required: true, unique: true },
  email: { type: String, required: true, unique: true },
  name: { type: String, required: true },
  googleToken: { type: String, required: false },
  // Additional fields as needed
});

const User = mongoose.model('User', userSchema);

module.exports = User;

backend/authController.js

const { OAuth2Client } = require('google-auth-library');
const jwt = require('jsonwebtoken');
const User = require('./userModel');

const CLIENT_ID = 'your-google-client-id';
const client = new OAuth2Client(CLIENT_ID);

async function verifyGoogleToken(token) {
  const ticket = await client.verifyIdToken({
      idToken: token,
      audience: CLIENT_ID,
  });
  const payload = ticket.getPayload();
  return payload;
}

async function findOrCreateUser(googleData) {
  let user = await User.findOne({ googleId: googleData.sub });
  if (!user) {
    user = new User({
      googleId: googleData.sub,
      email: googleData.email,
      name: googleData.name,
      // Additional fields as needed
    });
    await user.save();
  }
  return user;
}

function createSessionToken(user) {
  const payload = {
    userId: user._id,
    email: user.email,
    // Additional claims as needed
  };
  return jwt.sign(payload, 'your-secret-key', { expiresIn: '24h' });
}

app.post('/api/auth/google', async (req, res) => {
  try {
    const googleData = await verifyGoogleToken(req.body.token);
    const user = await findOrCreateUser(googleData);
    const token = createSessionToken(user);
    res.status(200).json({ token });
  } catch (error) {
    res.status(401).json({ message: 'Authentication failed', error });
  }
});

Frontend (frontend/auth.js and frontend/login.html)

  1. Add a Google sign-in button to login.html.
  2. Implement the client-side logic in auth.js to handle the Google sign-in response and communicate with the backend.

frontend/login.html

<!DOCTYPE html>
<html lang="en">
<head>
    <!-- ... -->
</head>
<body>
    <!-- ... -->
    <div id="gSignInWrapper">
        <div id="customBtn" class="customGPlusSignIn">
            <span class="icon"></span>
            <span class="buttonText">Google</span>
        </div>
    </div>
    <script src="https://apis.google.com/js/platform.js" async defer></script>
    <script src="auth.js"></script>
</body>
</html>

frontend/auth.js

gapi.load('auth2', function() {
  gapi.auth2.init({
    client_id: 'YOUR_CLIENT_ID.apps.googleusercontent.com',
  }).then(function () {
    gapi.signin2.render('customBtn', {
      'scope': 'profile email',
      'onsuccess': onSignIn,
      'onfailure': onFailure
    });
  });
});

function onSignIn(googleUser) {
  var id_token = googleUser.getAuthResponse().id_token;
  var xhr = new XMLHttpRequest();
  xhr.open('POST', '/api/auth/google');
  xhr.setRequestHeader('Content-Type', 'application/json');
  xhr.onload = function() {
    if (xhr.status === 200) {
      var response = JSON.parse(xhr.responseText);
      sessionStorage.setItem('sessionToken', response.token);
      window.location.href = '/dashboard.html';
    } else {
      console.error('Sign-in error:', xhr.responseText);
    }
  };
  xhr.send(JSON.stringify({ token: id_token }));
}

function onFailure(error) {
  console.error('Google sign-in failed:', error);
}

function signOut() {
  var auth2 = gapi.auth2.getAuthInstance();
  auth2.signOut().then(function () {
    console.log('User signed out.');
  });
}

initGoogleSignIn();

Make sure to replace placeholders like 'your-google-client-id', 'your-secret-key', and 'YOUR_CLIENT_ID.apps.googleusercontent.com' with actual values from your Google Developer Console and your secret key. Additionally, ensure that the backend endpoint /api/auth/google matches the route defined in authController.js.

Click here to create a Pull Request with the proposed solution

Files used for this task:

Changes on backend/userModel.js To solve the task for the `backend/userModel.js` file, we need to define a user model that can store the necessary information for a user who signs in using their Google account. Here's a practical proposal for implementing this in a Node.js environment using Mongoose, which is a common Object Data Modeling (ODM) library for MongoDB. 1. Install Mongoose if it's not already part of the project: ``` npm install mongoose ``` 2. Define the user schema with the necessary fields to store Google account information. Typically, you would store the Google ID and possibly the token if needed for further interactions with Google APIs on behalf of the user. Here's an example of how the `userModel.js` file might look: ```javascript const mongoose = require('mongoose'); // Define the schema for the user model const userSchema = new mongoose.Schema({ googleId: { type: String, required: true, unique: true }, email: { type: String, required: true, unique: true }, name: { type: String, required: true }, // Store the token if you need to make requests to Google on behalf of the user // This should be handled securely and might require encryption or other security measures googleToken: { type: String, required: false }, // Add any other fields that are necessary for your application }); // Create the model from the schema const User = mongoose.model('User', userSchema); module.exports = User; ``` This code snippet sets up a basic user schema with fields for the Google ID, email, name, and an optional Google token. The `googleId` field is marked as unique to ensure that there are no duplicate entries for the same Google account. Remember to handle the Google token securely, especially if you plan to store it. Depending on your application's requirements, you might need to implement additional security measures, such as encryption, to protect this sensitive information. By exporting the `User` model at the end of the file, other parts of the application can require and use this model to interact with the user data in the database.
Changes on backend/authController.js To solve the task for the `backend/authController.js` file, we need to implement the following steps: 1. **Set up Google OAuth 2.0**: Before writing any code, ensure that you have set up a project in the Google Developer Console, enabled the Google+ API, and obtained the necessary credentials (Client ID and Client Secret). 2. **Install Dependencies**: Use npm to install the required packages such as `google-auth-library` for Google authentication and `jsonwebtoken` for creating JWT tokens for session handling. ```bash npm install google-auth-library jsonwebtoken ``` 3. **Import Required Modules**: At the top of `authController.js`, import the necessary modules. ```javascript const { OAuth2Client } = require('google-auth-library'); const jwt = require('jsonwebtoken'); const User = require('./userModel'); // Assuming userModel.js is in the same directory ``` 4. **Initialize Google OAuth Client**: Create an instance of `OAuth2Client` with your Google Client ID. ```javascript const CLIENT_ID = 'your-google-client-id'; const client = new OAuth2Client(CLIENT_ID); ``` 5. **Create a Function to Verify Google Token**: This function will use the Google Auth library to verify the token received from the front end. ```javascript async function verifyGoogleToken(token) { const ticket = await client.verifyIdToken({ idToken: token, audience: CLIENT_ID, }); const payload = ticket.getPayload(); return payload; } ``` 6. **Create or Update User Record**: Implement a function that takes the Google user's data and either creates a new user record or updates an existing one. ```javascript async function findOrCreateUser(googleData) { let user = await User.findOne({ googleId: googleData.sub }); if (!user) { user = new User({ googleId: googleData.sub, email: googleData.email, name: googleData.name, // Add any other relevant user fields }); await user.save(); } return user; } ``` 7. **Handle Session or Token Creation**: Generate a JWT or any other session token for the authenticated user. ```javascript function createSessionToken(user) { const payload = { userId: user._id, email: user.email, // You can add more claims here }; return jwt.sign(payload, 'your-secret-key', { expiresIn: '24h' }); } ``` 8. **Create an Authentication Endpoint**: Finally, set up an endpoint in your Express app that handles the Google sign-in flow. ```javascript app.post('/api/auth/google', async (req, res) => { try { const googleData = await verifyGoogleToken(req.body.token); const user = await findOrCreateUser(googleData); const token = createSessionToken(user); res.status(200).json({ token }); } catch (error) { res.status(401).json({ message: 'Authentication failed', error }); } }); ``` Remember to replace `'your-google-client-id'`, `'your-secret-key'`, and any other placeholders with your actual configuration values. Also, ensure that error handling is robust and that sensitive information is not logged or exposed.
Changes on frontend/auth.js To implement the client-side logic for handling the Google sign-in response in the `frontend/auth.js` file, follow these steps: 1. **Load the Google API library**: Include the Google API JavaScript client library in the HTML file that references `auth.js`. This is typically done by adding a script tag in the `login.html` file. 2. **Initialize the Google API client**: In `auth.js`, initialize the Google API client with the correct client ID and any other necessary configurations. 3. **Render the Google sign-in button**: Use the Google API to render the sign-in button and define the sign-in callback function that will be triggered after a successful sign-in attempt. 4. **Sign-in callback function**: Create a function that will be called after the user successfully signs in. This function should retrieve the ID token from the Google user profile. 5. **Send the token to the back end**: Make an AJAX call to send the ID token to the back end for verification. You will need to define an endpoint on the server to handle this token. 6. **Handle the server response**: After sending the token to the server, handle the response. If the server successfully verifies the token and logs the user in, you may need to store the session token and redirect the user to a logged-in page. Here is a sample implementation for `frontend/auth.js`: ```javascript // Load the Google API client library gapi.load('auth2', function() { // Initialize the Google API client with your client ID gapi.auth2.init({ client_id: 'YOUR_CLIENT_ID.apps.googleusercontent.com', // Add any additional options if necessary }).then(function () { // Render the Google sign-in button gapi.signin2.render('google-signin-button', { 'scope': 'profile email', 'longtitle': true, 'theme': 'dark', 'onsuccess': onSignIn, 'onfailure': onFailure }); }); }); // Sign-in success callback function onSignIn(googleUser) { // Get the Google ID token var id_token = googleUser.getAuthResponse().id_token; // Send the token to your back end via an AJAX call var xhr = new XMLHttpRequest(); xhr.open('POST', '/api/auth/google'); xhr.setRequestHeader('Content-Type', 'application/json'); xhr.onload = function() { if (xhr.status === 200) { // Handle the server's response (e.g., store session token, redirect) var response = JSON.parse(xhr.responseText); // Assuming the server sends back a session token or similar sessionStorage.setItem('sessionToken', response.sessionToken); // Redirect to a logged-in page window.location.href = '/dashboard.html'; } else { // Handle errors (e.g., display a message to the user) console.error('Sign-in error:', xhr.responseText); } }; xhr.send(JSON.stringify({ token: id_token })); } // Sign-in failure callback function onFailure(error) { console.error('Google sign-in failed:', error); } // This function could be called to sign out a user function signOut() { var auth2 = gapi.auth2.getAuthInstance(); auth2.signOut().then(function () { console.log('User signed out.'); // Perform any additional cleanup tasks }); } ``` Make sure to replace `'YOUR_CLIENT_ID.apps.googleusercontent.com'` with the actual client ID provided by Google for your application. Also, the server endpoint `/api/auth/google` should match the route you set up in your back end to handle the Google ID token.
Changes on frontend/login.html To solve the task for the `frontend/login.html` file, we need to add a Google sign-in button and the necessary JavaScript to handle the sign-in flow. Here's a practical proposal for implementing this: 1. **Add the Google Sign-In Button:** We need to include a button element that users can click to initiate the Google sign-in process. This can be done by adding the following HTML code to the `login.html` file: ```html Login
Google
``` 2. **Configure the Google Sign-In JavaScript Client:** In the `auth.js` file (which is referenced in the HTML), we will need to configure the Google sign-in client. This involves initializing the Google API client library and setting up the sign-in button with the appropriate client ID and scopes. 3. **Handle the Sign-In Flow:** The `auth.js` file should also include the logic to handle the sign-in flow. This involves listening for sign-in events, retrieving the sign-in user's information, and sending the Google OAuth token to the backend for verification. Here's a basic outline of what the `auth.js` file might contain (you will need to replace `'YOUR_CLIENT_ID'` with the actual client ID obtained from the Google Developer Console): ```javascript // auth.js // Function to initialize the Google API client library and set up sign-in function initGoogleSignIn() { gapi.load('auth2', function() { // Initialize the Google auth2 library gapi.auth2.init({ client_id: 'YOUR_CLIENT_ID', cookiepolicy: 'single_host_origin', // Request scopes in addition to 'profile' and 'email' // scope: 'additional_scope' }).then(function () { attachSignin(document.getElementById('customBtn')); }); }); } // Function to attach the sign-in event to the button function attachSignin(element) { const auth2 = gapi.auth2.getAuthInstance(); auth2.attachClickHandler(element, {}, function(googleUser) { // Get the Google OAuth token - we'll send it to the server const id_token = googleUser.getAuthResponse().id_token; // Send the token to your backend via HTTPS // (This part will be implemented in the backend/authController.js file) }, function(error) { alert(JSON.stringify(error, undefined, 2)); }); } // Start the app by initializing the Google sign-in client initGoogleSignIn(); ``` Remember to include the `auth.js` script in the `login.html` file, as shown in the HTML example above. This will ensure that the Google sign-in button is properly initialized and ready to handle user interactions. By following these steps, you will have added a Google sign-in button to the `frontend/login.html` file and set up the initial JavaScript required to handle the sign-in flow. The next steps will involve implementing the backend logic to verify the Google token and manage user sessions, which will be handled in the `backend/authController.js` and `backend/userModel.js` files.