constexpress=require('express');constpassport=require('passport');constconfig=require('./config');const{GITHUB_CLIENT_ID,GITHUB_CLIENT_SECRET}=config;constapp=express();constOAuth2Strategy=require('passport-oauth2');varGitHubStrategy=require('passport-github').Strategy;passport.use(newOAuth2Strategy({authorizationURL: 'https://github.com/login/oauth/authorize',tokenURL: 'https://github.com/login/oauth/access_token',clientID: GITHUB_CLIENT_ID,clientSecret: GITHUB_CLIENT_SECRET,callbackURL: "http://localhost:3000/auth/callback"},function(accessToken,refreshToken,profile,done){done(null,{
accessToken,
refreshToken,
profile
});}));app.get('/',(req,res)=>{res.send(`<a href="/login">Login</a>`);});app.get('/login',passport.authenticate('oauth2'))app.get('/auth/callback',passport.authenticate('oauth2',{failureRedirect: '/login-error',session: false}),function(req,res){console.log('this is user',req.user);// Successful authentication, redirect home.res.redirect('/homepage');})app.get('/homepage',(req,res)=>{res.send(`<a href="/logout">Logout</a>`);});app.listen(3000,()=>{console.log('Example app listening on port 3000!');});