Task Tile

[erfanNectar]

Hey @autopilot implement a Google sign-in on my website. Make changes to the front end and the back end of the application

I want to allow users to signup and login using their Google account

[codeautopilot[bot]]

Potential solution

To implement Google sign-in on both the front end and back end, we will follow the steps outlined in the "Changes to files" section. The front end will be responsible for rendering the Google sign-in button and handling the sign-in process, while the back end will verify the ID token sent by the front end and create or update the user record in the database.

Code

Frontend (frontend/auth.js)

// Load the Google API Library in the HTML file with a script tag

// Initialize the Google Auth API
function initGoogleAuth() {
  gapi.load('auth2', function() {
    gapi.auth2.init({
      client_id: 'YOUR_CLIENT_ID.apps.googleusercontent.com',
      scope: 'profile email'
    }).then(function () {
      renderGoogleSignInButton();
    });
  });
}

// Render the Google Sign-in Button
function renderGoogleSignInButton() {
  gapi.signin2.render('google-signin-button', {
    'onsuccess': onGoogleSignIn
  });
}

// Sign-in Callback Function
function onGoogleSignIn(googleUser) {
  var id_token = googleUser.getAuthResponse().id_token;
  sendTokenToBackend(id_token);
}

// Helper function to send the ID token to the backend
function sendTokenToBackend(id_token) {
  var xhr = new XMLHttpRequest();
  xhr.open('POST', '/api/auth/google-signin');
  xhr.setRequestHeader('Content-Type', 'application/json');
  xhr.onload = function() {
    if (xhr.status === 200) {
      var response = JSON.parse(xhr.responseText);
      localStorage.setItem('sessionToken', response.token);
      // Redirect to user dashboard or perform other actions
    } else {
      // Handle errors
    }
  };
  xhr.send(JSON.stringify({ token: id_token }));
}

// Call the init function when the window loads
window.onload = function() {
  initGoogleAuth();
};

Backend (backend/userModel.js)

const mongoose = require('mongoose');

const userSchema = new mongoose.Schema({
  // Standard fields
  username: { type: String, unique: true, sparse: true },
  email: { type: String, unique: true, required: true },
  password: { type: String },

  // Google authentication fields
  googleId: { type: String, unique: true, sparse: true },
  googleToken: { type: String },
  googleRefreshToken: { type: String },

  // Profile information
  profilePicture: { type: String },
  displayName: { type: String },

  // Additional fields
  createdAt: { type: Date, default: Date.now },
  updatedAt: { type: Date, default: Date.now },
});

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

module.exports = User;

Backend (backend/authController.js)

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

const CLIENT_ID = 'YOUR_GOOGLE_CLIENT_ID';
const client = new OAuth2Client(CLIENT_ID);

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

async function handleGoogleSignIn(req, res) {
  try {
    const { token } = req.body;
    const googleUser = await verifyToken(token);

    let user = await User.findOne({ googleId: googleUser.sub });

    if (!user) {
      user = await User.create({
        googleId: googleUser.sub,
        email: googleUser.email,
        displayName: googleUser.name,
        // Add other fields as necessary
      });
    }

    const sessionToken = jwt.sign({ userId: user._id }, 'YOUR_SECRET_KEY', { expiresIn: '1h' });

    res.status(200).json({
      message: 'User logged in successfully',
      sessionToken: sessionToken,
      user: user,
    });
  } catch (error) {
    res.status(500).json({ message: 'Error signing in with Google', error: error });
  }
}

module.exports = {
  handleGoogleSignIn,
};

Frontend (frontend/login.html)

<!-- Inside frontend/login.html -->
<div id="google-signin-button"></div>
<script src="https://apis.google.com/js/platform.js" async defer></script>
<script src="path/to/auth.js"></script> <!-- Include the auth.js script -->
<meta name="google-signin-client_id" content="YOUR_CLIENT_ID.apps.googleusercontent.com">

In this solution, we have provided the necessary code snippets to implement Google sign-in on both the front end and back end. The front end will render a Google sign-in button and handle the sign-in process, while the back end will verify the ID token and manage user records. Remember to replace placeholders like YOUR_CLIENT_ID and YOUR_SECRET_KEY with your actual credentials.

Click here to create a Pull Request with the proposed solution

Files used for this task:

Changes on frontend/auth.js

To implement the client-side logic for Google sign-in in the `frontend/auth.js` file, you will need to follow these steps: 1. **Load the Google API Library**: Include the Google API JavaScript client library in your HTML file if it's not already there. 2. **Initialize the Google Auth API**: Configure the Google Auth API with your client ID and specify the scopes your application needs. 3. **Render the Google Sign-in Button**: Use the Google API to render the sign-in button and define the sign-in callback function. 4. **Sign-in Callback Function**: This function will be called after the user successfully signs in. It should retrieve the ID token and send it to your backend for verification. 5. **Communicate with the Backend**: Send the Google ID token to your backend using AJAX or a similar method, and handle the response to maintain the user's session state. Here's a basic outline of what the `frontend/auth.js` file might look like: ```javascript // 1. Load the Google API Library // This is usually done in the HTML file with a script tag // 2. Initialize the Google Auth API function initGoogleAuth() { gapi.load('auth2', function() { gapi.auth2.init({ client_id: 'YOUR_CLIENT_ID.apps.googleusercontent.com', scope: 'profile email' }).then(function () { renderGoogleSignInButton(); }); }); } // 3. Render the Google Sign-in Button function renderGoogleSignInButton() { gapi.signin2.render('google-signin-button', { 'onsuccess': onGoogleSignIn }); } // 4. Sign-in Callback Function function onGoogleSignIn(googleUser) { var id_token = googleUser.getAuthResponse().id_token; // 5. Communicate with the Backend sendTokenToBackend(id_token); } // Helper function to send the ID token to the backend function sendTokenToBackend(id_token) { var xhr = new XMLHttpRequest(); xhr.open('POST', '/your-backend-endpoint'); xhr.setRequestHeader('Content-Type', 'application/json'); xhr.onload = function() { if (xhr.status === 200) { // Handle the response from your backend // For example, you might store the session token in localStorage var response = JSON.parse(xhr.responseText); localStorage.setItem('sessionToken', response.sessionToken); // Redirect to user dashboard or perform other actions } else { // Handle errors, such as displaying a message to the user } }; xhr.send(JSON.stringify({ token: id_token })); } // Call the init function when the window loads window.onload = function() { initGoogleAuth(); }; ``` Remember to replace `'YOUR_CLIENT_ID.apps.googleusercontent.com'` with your actual Google client ID and `/your-backend-endpoint` with the endpoint on your server that will handle the Google ID token verification. This script should be included in your `login.html` file, and you should ensure that the Google API client library is loaded before this script runs.

Changes on backend/userModel.js

Since `backend/userModel.js` is a new file, we need to create a user model that can accommodate the necessary information for users signing in with Google. Here's a practical proposal for implementing the user model in a Node.js environment using Mongoose, which is a common Object Data Modeling (ODM) library for MongoDB. ```javascript const mongoose = require('mongoose'); const userSchema = new mongoose.Schema({ // Add standard fields for your application's users username: { type: String, unique: true, required: true }, email: { type: String, unique: true, required: true }, password: { type: String }, // This might be optional if using Google sign-in exclusively // Fields specific to Google authentication googleId: { type: String, unique: true, sparse: true }, // Unique Google user ID googleToken: { type: String }, // Token provided by Google to access their APIs googleRefreshToken: { type: String }, // Refresh token provided by Google (if needed) // Optionally, store the user's profile information from Google profilePicture: { type: String }, // URL to the user's profile picture displayName: { type: String }, // User's display name // Any additional fields you want to include createdAt: { type: Date, default: Date.now }, updatedAt: { type: Date, default: Date.now }, }); // If you want to handle both local and Google sign-in, you might want to add methods to the schema // to handle password hashing and verification for local sign-in. const User = mongoose.model('User', userSchema); module.exports = User; ``` This schema includes fields for both local authentication (username, email, password) and Google authentication (googleId, googleToken, googleRefreshToken). The `googleId` field is marked as unique and sparse, which means that it will be indexed by MongoDB, but the index will only include documents where `googleId` exists, allowing for users who do not have a Google account linked. Remember to install Mongoose and connect it to your MongoDB instance in your main application file before using this model. Also, ensure that you handle the logic for creating or updating users based on Google sign-in in your `authController.js`.

Changes on backend/authController.js

To implement Google sign-in functionality in the `backend/authController.js` file, you will need to follow these steps: 1. **Install Google Authentication Library**: Use npm to install the official Google authentication library for Node.js, which can be used to verify the Google sign-in tokens. ```bash npm install google-auth-library ``` 2. **Set Up Google Client ID**: Obtain the Google Client ID from the Google Developer Console for your project. 3. **Verify ID Token**: Use the Google Auth Library to verify the ID token sent from the client-side after a user signs in with Google. 4. **User Lookup / Creation**: Once the token is verified, extract the user's profile information from the token and check if the user already exists in your database. If not, create a new user record. 5. **Session or Token Creation**: After the user is verified or created, generate a session or a token (like JWT) to keep the user logged in. Here's a basic implementation outline for `backend/authController.js`: ```javascript const { OAuth2Client } = require('google-auth-library'); const User = require('./userModel'); // Assuming you have a user model const jwt = require('jsonwebtoken'); // If you're using JWT for session management const CLIENT_ID = 'YOUR_GOOGLE_CLIENT_ID'; const client = new OAuth2Client(CLIENT_ID); async function verifyToken(idToken) { const ticket = await client.verifyIdToken({ idToken: idToken, audience: CLIENT_ID, }); const payload = ticket.getPayload(); return payload; } async function handleGoogleSignIn(req, res) { try { const { idToken } = req.body; const googleUser = await verifyToken(idToken); let user = await User.findOne({ googleId: googleUser.sub }); if (!user) { user = await User.create({ googleId: googleUser.sub, email: googleUser.email, name: googleUser.name, // Add other fields as necessary }); } // Create a session or token for the user const token = jwt.sign({ userId: user._id }, 'YOUR_SECRET_KEY', { expiresIn: '1h' }); res.status(200).json({ message: 'User logged in successfully', token: token, user: user, }); } catch (error) { res.status(500).json({ message: 'Error signing in with Google', error: error }); } } module.exports = { handleGoogleSignIn, }; ``` Remember to replace `'YOUR_GOOGLE_CLIENT_ID'` and `'YOUR_SECRET_KEY'` with your actual Google Client ID and secret key for JWT. This code provides a basic structure for handling Google sign-in on the server side. You will need to integrate it with your existing user model and authentication flow. Additionally, ensure you handle errors and edge cases appropriately for a production environment.

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 on how to implement this: 1. **Add the Google Sign-In Button:** We need to include a button in the HTML that users can click to initiate the Google sign-in process. Google provides a simple way to render a sign-in button with their library. ```html

``` 2. **Include Google's API Library:** To use Google's sign-in functionality, we need to include their API library in the HTML file. ```html ``` 3. **Configure the Sign-In Button:** We need to configure the sign-in button with our application's client ID and specify the callback function that will be triggered after a user successfully signs in. ```html ``` 4. **Initialize the Sign-In Process:** We need to initialize the sign-in process when the page loads. ```html ``` 5. **Add Meta Tags for Google Sign-In:** It's a good practice to include meta tags in the HTML to specify the OAuth client ID and to indicate that we are using Google Sign-In. ```html ``` 6. **Styling the Button (Optional):** Optionally, you can add custom CSS to style the Google sign-in button to match your website's design. ```html ``` Remember to replace `YOUR_CLIENT_ID` with the actual client ID provided by Google for your application. You can obtain this from the Google Developer Console where you have registered your application. This implementation will add a Google sign-in button to the `frontend/login.html` file and handle the sign-in flow using JavaScript. The `onSuccess` function should be further implemented to communicate with the backend, which will be handled in the `frontend/auth.js` file.

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