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Passport Authentication for Node.js Applications

This tutorial demonstrates Facebook and GitHub authentication in a Node.js web application using Passport.js, a popular authentication middleware. Passport simplifies OAuth and OpenID Connect integration.

Key Concepts:

Passport.js: A Node.js middleware streamlining authentication with various providers (Facebook, GitHub, Google, etc.).
Express.js: A web application framework for Node.js used to build the application's structure and handle routing.
OAuth 2.0: The authorization framework used by Facebook and GitHub.
Strategies: Passport uses strategies for each provider (e.g., passport-facebook, passport-github).

Application Setup:

Project Initialization: Create a project directory and initialize a Node.js project:
```
mkdir AuthApp
cd AuthApp
npm init -y
```

HTML Setup: Create auth.html in the project root:

<!DOCTYPE html>
<html>
<head>
  <title>Node.js OAuth</title>
</head>
<body>
  <a href="http://miracleart.cn/link/cc1d70ad9d0ce820738dc9ffc4053a76">Sign in with Facebook</a><br><br>
  <a href="http://miracleart.cn/link/899a13400527fd3b12105ec17a67dbac">Sign in with GitHub</a>
</body>
</html>

Install Dependencies: Install Express and Passport:
```
npm install express passport --save
```

Express App: Create index.js:

const express = require('express');
const app = express();
const port = process.env.PORT || 3000;

app.get('/', (req, res) => res.sendFile('auth.html', { root: __dirname }));
app.listen(port, () => console.log(`App listening on port ${port}`));

Run the app (node index.js) and verify http://localhost:3000 displays the HTML. Stop the app (Ctrl C).

Passport Configuration:

Install Provider Strategies: Install Facebook and GitHub strategies:
```
npm install passport-facebook passport-github --save
```

Passport Setup in index.js:

const passport = require('passport');
app.use(passport.initialize());
app.use(passport.session());

app.get('/success', (req, res) => res.send("Successfully logged in!"));
app.get('/error', (req, res) => res.send("Error logging in."));

passport.serializeUser((user, done) => done(null, user));
passport.deserializeUser((user, done) => done(null, user));

Facebook Authentication:

Create a Facebook App: Follow Facebook's instructions to create a new app and obtain your App ID and App Secret.

Configure Facebook Strategy in index.js:

const FacebookStrategy = require('passport-facebook').Strategy;
const FACEBOOK_APP_ID = 'YOUR_FACEBOOK_APP_ID'; // Replace with your App ID
const FACEBOOK_APP_SECRET = 'YOUR_FACEBOOK_APP_SECRET'; // Replace with your App Secret

passport.use(new FacebookStrategy({
    clientID: FACEBOOK_APP_ID,
    clientSecret: FACEBOOK_APP_SECRET,
    callbackURL: "http://miracleart.cn/link/cc1d70ad9d0ce820738dc9ffc4053a76/callback",
    profileFields: ['id', 'displayName', 'photos', 'email'] //Optional: Specify fields to retrieve
}, (accessToken, refreshToken, profile, done) => {
    done(null, profile);
}));

app.get('http://miracleart.cn/link/cc1d70ad9d0ce820738dc9ffc4053a76', passport.authenticate('facebook'));
app.get('http://miracleart.cn/link/cc1d70ad9d0ce820738dc9ffc4053a76/callback',
    passport.authenticate('facebook', { failureRedirect: '/error' }),
    (req, res) => res.redirect('/success')
);

Remember to configure your Facebook app's valid OAuth redirect URIs to http://localhost:3000http://miracleart.cn/link/cc1d70ad9d0ce820738dc9ffc4053a76/callback.

GitHub Authentication:

Create a GitHub App: Create a new GitHub app and obtain your Client ID and Client Secret.

Configure GitHub Strategy in index.js:

const GitHubStrategy = require('passport-github').Strategy;
const GITHUB_CLIENT_ID = 'YOUR_GITHUB_CLIENT_ID'; // Replace with your Client ID
const GITHUB_CLIENT_SECRET = 'YOUR_GITHUB_CLIENT_SECRET'; // Replace with your Client Secret

passport.use(new GitHubStrategy({
    clientID: GITHUB_CLIENT_ID,
    clientSecret: GITHUB_CLIENT_SECRET,
    callbackURL: "http://miracleart.cn/link/899a13400527fd3b12105ec17a67dbac/callback"
}, (accessToken, refreshToken, profile, done) => {
    done(null, profile);
}));

app.get('http://miracleart.cn/link/899a13400527fd3b12105ec17a67dbac', passport.authenticate('github'));
app.get('http://miracleart.cn/link/899a13400527fd3b12105ec17a67dbac/callback',
    passport.authenticate('github', { failureRedirect: '/error' }),
    (req, res) => res.redirect('/success')
);

Configure your GitHub app's authorization callback URL to http://localhost:3000http://miracleart.cn/link/899a13400527fd3b12105ec17a67dbac/callback.

Run the Application:

Start the server (node index.js) and test the Facebook and GitHub login links. The /success route will indicate successful authentication. Remember to replace placeholder IDs and secrets with your actual values. This provides a basic framework; error handling and user persistence in a database would be necessary for a production-ready application.

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Passport Authentication for Node.js Applications

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Passport Authentication for Node.js Applications

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