Task Tile

[DyroxOne]

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]

Potential solution

To implement Google sign-in, we need to update the user model to include fields relevant to Google's OAuth, such as googleId and profilePicture. On the frontend, we need to load the Google API library, initialize the Google API client, render the Google sign-in button, and handle the sign-in callback. The backend needs to verify the Google sign-in token and create or update the user record accordingly.

How to implement

Backend (backend/userModel.js)

• Update the user schema to include googleId and profilePicture.
• Ensure that googleId is unique but not required, using a sparse index.

const mongoose = require('mongoose');

const userSchema = new mongoose.Schema({
  // ... other fields ...
  googleId: {
    type: String,
    unique: true,
    sparse: true
  },
  profilePicture: String,
  // ... other fields ...
}, { timestamps: true });

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

module.exports = User;

Frontend (frontend/auth.js)

• Load and initialize the Google API client with the correct client ID and scopes.
• Render the Google sign-in button and set up the sign-in callback.
• Send the Google sign-in token to the backend and handle the response.

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

function renderGoogleSignInButton() {
  gapi.signin2.render('google-signin-button', {
    'onsuccess': onGoogleSignIn
  });
}

function onGoogleSignIn(googleUser) {
  var id_token = googleUser.getAuthResponse().id_token;
  sendTokenToBackend(id_token);
}

function sendTokenToBackend(id_token) {
  fetch('/api/auth/google', {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json'
    },
    body: JSON.stringify({ token: id_token })
  })
  .then(response => response.json())
  .then(data => {
    if (data.success) {
      // Handle successful sign-in
    } else {
      // Handle sign-in error
    }
  })
  .catch(error => {
    console.error('Error during Google sign-in token verification:', error);
  });
}

initGoogleAuth();

Frontend (frontend/login.html)

• Add the Google sign-in button to the HTML.
• Include the Google API JavaScript library and the auth.js script.

<!-- ... other HTML ... -->
<div id="google-signin-button"></div>
<script src="https://apis.google.com/js/platform.js" async defer></script>
<script src="auth.js"></script>
<!-- ... other HTML ... -->

Backend (backend/authController.js)

• Install and set up the Google OAuth client.
• Create a function to verify the Google sign-in token.
• Check if a user exists with the given Google ID, update or create a user record.
• Create a session or token for the user.

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

exports.googleSignIn = async (req, res) => {
  try {
    const { token } = req.body;
    const googleUser = await verifyToken(token);

    let user = await User.findOne({ googleId: googleUser.sub });
    if (!user) {
      user = new User({
        googleId: googleUser.sub,
        email: googleUser.email,
        name: googleUser.name,
        profilePicture: googleUser.picture
      });
      await user.save();
    }

    const userToken = jwt.sign({ userId: user._id }, 'YOUR_SECRET_KEY', { expiresIn: '24h' });

    res.status(200).json({
      message: 'User signed in successfully',
      token: userToken,
      user,
    });
  } catch (error) {
    res.status(500).json({ message: 'Authentication failed', error });
  }
};

Replace 'YOUR_GOOGLE_CLIENT_ID' and 'YOUR_SECRET_KEY' with your actual credentials. Ensure that the route /api/auth/google is set up to handle POST requests in your backend routing.

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 schema that includes the necessary fields for Google sign-in. Assuming we are using a MongoDB database with Mongoose as the ODM (Object Data Modeling library), here's a practical proposal for the schema:

const mongoose = require('mongoose');

// Define the User schema
const userSchema = new mongoose.Schema({
  // Add other necessary fields as per your application requirements
  email: {
    type: String,
    required: true,
    unique: true
  },
  name: {
    type: String,
    required: true
  },
  // This field will store the Google ID associated with the user's account
  googleId: {
    type: String,
    required: false, // This should not be required if you support other authentication methods
    unique: true, // Ensure that the Google ID is unique across users
    sparse: true // This allows for the field to be unique but not required
  },
  // You may also want to store the profile picture URL if provided by Google
  profilePicture: {
    type: String,
    required: false
  }
  // Include any additional fields such as timestamps, roles, etc.
}, { timestamps: true });

// Create the model from the schema
const User = mongoose.model('User', userSchema);

module.exports = User;

This schema includes the googleId field, which is essential for linking the Google account with the user profile in your application. It's marked as not required and unique with a sparse index, which allows for users who do not use Google sign-in to still be part of the system without a googleId.

Remember to install mongoose if it's not already included in your project by running npm install mongoose.

After defining the schema and model, you can use this model in your authController.js to create or update user records when a Google sign-in token is verified.

Changes on frontend/auth.js

To implement the OAuth client flow for Google sign-in in the frontend/auth.js file, follow these steps:

1. Load the Google API library: Include the Google API JavaScript client library in your HTML file or dynamically load it in auth.js.

2. Initialize the Google API client: Configure the OAuth client with your project's client ID and the scopes your application requires.

3. Render the Google sign-in button: Use the Google API to render the sign-in button and set up the callback function that will be triggered after a user successfully signs in.

4. Handle the sign-in callback: In the callback function, extract the Google sign-in token (ID token) from the signed-in user.

5. Send the token to the back end: Make an AJAX call to your back-end server, sending the Google sign-in token for verification.

6. Handle the sign-in flow: If the back end successfully verifies the token and signs the user in, handle the client-side flow accordingly (e.g., redirect the user or update the UI).

Here's a practical implementation outline for frontend/auth.js:

// Step 1: Load the Google API library if not already loaded
// This can be done in the HTML file or here dynamically

// Step 2: Initialize the Google API client
function initGoogleAuth() {
  gapi.load('auth2', function() {
    gapi.auth2.init({
      client_id: 'YOUR_CLIENT_ID.apps.googleusercontent.com', // Replace with your client ID
      scope: 'profile email' // Request scopes as needed
    }).then(function () {
      renderGoogleSignInButton();
    });
  });
}

// Step 3: Render the Google sign-in button
function renderGoogleSignInButton() {
  gapi.signin2.render('google-signin-button', {
    'onsuccess': onGoogleSignIn
  });
}

// Step 4: Handle the sign-in callback
function onGoogleSignIn(googleUser) {
  var id_token = googleUser.getAuthResponse().id_token;
  // Step 5: Send the token to the back end
  sendTokenToBackend(id_token);
}

// Step 5: Send the token to the back end
function sendTokenToBackend(id_token) {
  // Use AJAX or Fetch API to send the token to your server
  fetch('/api/auth/google', {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json'
    },
    body: JSON.stringify({ token: id_token })
  })
  .then(response => response.json())
  .then(data => {
    // Step 6: Handle the sign-in flow
    if (data.success) {
      // User is signed in, redirect or update UI
    } else {
      // Handle errors
    }
  })
  .catch(error => {
    console.error('Error during Google sign-in token verification:', error);
  });
}

// Initialize Google Auth when the script loads
initGoogleAuth();

Make sure to replace 'YOUR_CLIENT_ID.apps.googleusercontent.com' with the actual client ID provided by Google for your application. Also, the endpoint /api/auth/google should match the route on your back end that will handle the Google sign-in token verification.

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 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:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Login</title>
    <!-- Include any other necessary CSS files here -->
</head>
<body>
    <!-- Other login form elements -->

    <!-- Google Sign-In button -->
    <div id="gSignInWrapper">
        <div id="customBtn" class="customGPlusSignIn">
            <span class="icon"></span>
            <span class="buttonText">Google</span>
        </div>
    </div>

    <!-- Include any other necessary JS files here -->
    <!-- Include the Google API JavaScript library -->
    <script src="https://apis.google.com/js/platform.js" async defer></script>
    <script src="auth.js"></script> <!-- This will contain the OAuth client flow logic -->
</body>
</html>

2. Include Google's API JavaScript Library:
   The Google API JavaScript library is required to facilitate the OAuth flow. This library provides the necessary functions to handle the sign-in process. The script tag for this library is included in the above HTML code.

3. Customize the Sign-In Button:
   You can customize the appearance of the Google sign-in button to match your website's design. The above code includes a custom button with an ID customBtn. You can style it using CSS.

4. Handle the Sign-In Flow with JavaScript:
   In the auth.js file, you will need to implement the logic to initialize the Google Auth API, handle the sign-in button click, and process the sign-in flow. This will involve calling Google's gapi.auth2 methods and handling the sign-in token.

Here is a basic outline of what the JavaScript in auth.js might look like:

// auth.js
function onSignIn(googleUser) {
    var profile = googleUser.getBasicProfile();
    // You can retrieve the Google ID token from the googleUser object
    var 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)
    // Example POST method implementation:
    postData('https://yourbackend.example.com/verifyGoogleToken', { idToken: id_token })
      .then(data => {
        console.log(data); // JSON data parsed by `data.json()` call
      });
}

function renderButton() {
    gapi.signin2.render('customBtn', {
        'scope': 'profile email',
        'width': 240,
        'height': 50,
        'longtitle': true,
        'theme': 'dark',
        'onsuccess': onSignIn,
        'onfailure': onFailure // You need to define the onFailure function
    });
}

// Load the Google Auth library and render the button
gapi.load('auth2', function() {
    gapi.auth2.init({
        client_id: 'YOUR_CLIENT_ID.apps.googleusercontent.com', // Replace with your Google client ID
    }).then(renderButton);
});

// Helper function to POST data to the backend
async function postData(url = '', data = {}) {
    const response = await fetch(url, {
        method: 'POST',
        mode: 'cors',
        cache: 'no-cache',
        credentials: 'same-origin',
        headers: {
            'Content-Type': 'application/json'
        },
        redirect: 'follow',
        referrerPolicy: 'no-referrer',
        body: JSON.stringify(data)
    });
    return response.json();
}

Please replace 'YOUR_CLIENT_ID.apps.googleusercontent.com' with your actual Google client ID. You will also need to define the onFailure function to handle sign-in failures.

This is a high-level overview of the changes needed for the frontend/login.html file. You will need to ensure that the auth.js file is properly linked and that the backend is set up to handle the token verification and user session management.

Changes on backend/authController.js

To solve the task for the backend/authController.js file, we need to implement the following steps:

1. Install Required Packages: Ensure that the necessary packages for handling OAuth, such as google-auth-library, are installed in the project.

2. Set Up Google OAuth Client: Initialize the Google OAuth client with the credentials obtained from the Google Developer Console.

3. Create Token Verification Function: Implement a function that takes the Google sign-in token from the request, verifies it using the Google OAuth client, and extracts the user's profile information.

4. User Record Handling: Check if a user with the given Google ID already exists in the database. If so, update their record; if not, create a new user record.

5. Session or Token Creation: After the user is authenticated, create a session or generate a token (e.g., JWT) to maintain the user's logged-in state.

6. Error Handling: Implement error handling for cases such as invalid tokens, network errors, or database issues.

Here is a basic outline of how the backend/authController.js file might look after implementing the above steps:

const { OAuth2Client } = require('google-auth-library');
const User = require('./userModel'); // Assuming userModel.js is in the same directory
const jwt = require('jsonwebtoken'); // If using JWT for session management

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

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

exports.googleSignIn = async (req, res) => {
  try {
    const { token } = req.body;
    const googleUser = await verifyToken(token);

    let user = await User.findOne({ googleId: googleUser.sub });
    if (!user) {
      user = new User({
        googleId: googleUser.sub,
        email: googleUser.email,
        name: googleUser.name,
        // Add any other user fields you need from the Google profile
      });
      await user.save();
    }

    // Create session or token
    const userToken = jwt.sign({ userId: user._id }, 'YOUR_SECRET_KEY', { expiresIn: '24h' });

    res.status(200).json({
      message: 'User signed in successfully',
      token: userToken,
      user,
    });
  } catch (error) {
    res.status(500).json({ message: 'Authentication failed', error });
  }
};

Remember to replace 'YOUR_GOOGLE_CLIENT_ID' and 'YOUR_SECRET_KEY' with your actual Google client ID and secret key. Also, ensure that the user model (userModel.js) has a field for storing the Google ID (googleId).

Disclaimer: This comment was entirely generated using AI. Be aware that the information provided may be incorrect.

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[DyroxOne]

good luck