使用Node.js实现GitHub登录功能

npm init -y
npm install express passport passport-github2 express-session dotenv

GITHUB_CLIENT_ID=your-client-id
GITHUB_CLIENT_SECRET=your-client-secret
GITHUB_CALLBACK_URL=http://localhost:3000/auth/github/callback
SESSION_SECRET=your-session-secret

const express = require('express');
const passport = require('passport');
const session = require('express-session');
const dotenv = require('dotenv');
const GitHubStrategy = require('passport-github2').Strategy;

dotenv.config();

const app = express();
const port = 3000;

// 设置会话中间件
app.use(session({
    secret: process.env.SESSION_SECRET,
    resave: false,
    saveUninitialized: true
}));

// 初始化 Passport
app.use(passport.initialize());
app.use(passport.session());

// 配置 Passport 使用 GitHub OAuth 2.0 策略
passport.use(new GitHubStrategy({
    clientID: process.env.GITHUB_CLIENT_ID,
    clientSecret: process.env.GITHUB_CLIENT_SECRET,
    callbackURL: process.env.GITHUB_CALLBACK_URL
}, function(accessToken, refreshToken, profile, done) {
    // 在此处可以将 GitHub 用户信息存储到数据库
    return done(null, profile);
}));

// 序列化用户到 session 中
passport.serializeUser(function(user, done) {
    done(null, user);
});

// 反序列化用户
passport.deserializeUser(function(user, done) {
    done(null, user);
});

// 路由：跳转到 GitHub 登录页面
app.get('/auth/github', (req, res) => {
    passport.authenticate('github', { scope: ['user:email'] })(req, res);
});

// 路由：GitHub 登录回调
app.get('/auth/github/callback', (req, res) => {
    passport.authenticate('github', { failureRedirect: '/' })(req, res, function() {
        res.redirect('/profile');
    });
});

// 路由：用户个人资料页面
app.get('/profile', (req, res) => {
    if (!req.isAuthenticated()) {
        return res.redirect('/');
    }
    res.json(req.user);  // 返回用户信息
});

// 路由：退出登录
app.get('/logout', (req, res) => {
    req.logout(function(err) {
        res.redirect('/');
    });
});

// 路由：首页
app.get('/', (req, res) => {
    if (req.isAuthenticated()) {
        return res.redirect('/profile');
    }
    res.send('<a href="/auth/github" rel="external nofollow" >Login with GitHub</a>');
});

// 启动服务器
app.listen(port, () => {
    console.log(`Server is running at http://localhost:${port}`);
});

node app.js

app.get('/auth/github/callback', (req, res) => {
    passport.authenticate('github', { failureRedirect: '/' })(req, res, function() {
        res.redirect('/profile');
    });
});

app.get('/profile', (req, res) => {
    if (!req.isAuthenticated()) {
        return res.redirect('/');
    }
    res.json(req.user);  // 返回用户信息
});