使用Passport为Node.js应用程序提供社交认证

// facebook app settings - fb.js
module.exports = {
  'appID' : '<your_app_identifier>',
  'appSecret' : '<your_app_secret>',
  'callbackUrl' : 'http://localhost:3000/login/facebook/callback'
}

passport.use('facebook', new FacebookStrategy({
  clientID        : fbConfig.appID,
  clientSecret    : fbConfig.appSecret,
  callbackURL     : fbConfig.callbackUrl
},

  // facebook will send back the tokens and profile
  function(access_token, refresh_token, profile, done) {
	// asynchronous
	process.nextTick(function() {
    
	  // find the user in the database based on their facebook id
	  User.findOne({ 'id' : profile.id }, function(err, user) {

	    // if there is an error, stop everything and return that
	    // ie an error connecting to the database
	    if (err)
	      return done(err);

		  // if the user is found, then log them in
	      if (user) {
	        return done(null, user); // user found, return that user
	      } else {
	        // if there is no user found with that facebook id, create them
	        var newUser = new User();

			// set all of the facebook information in our user model
	        newUser.fb.id    = profile.id; // set the users facebook id	                
	        newUser.fb.access_token = access_token; // we will save the token that facebook provides to the user	                
	        newUser.fb.firstName  = profile.name.givenName;
	        newUser.fb.lastName = profile.name.familyName; // look at the passport user profile to see how names are returned
	        newUser.fb.email = profile.emails[0].value; // facebook can return multiple emails so we'll take the first

			// save our user to the database
	        newUser.save(function(err) {
	          if (err)
	            throw err;

	          // if successful, return the new user
	          return done(null, newUser);
	        });
	     } 
	  });
    });
}));

// route for facebook authentication and login
// different scopes while logging in
router.get('/login/facebook', 
  passport.authenticate('facebook', { scope : 'email' }
));

// handle the callback after facebook has authenticated the user
router.get('/login/facebook/callback',
  passport.authenticate('facebook', {
    successRedirect : '/home',
	failureRedirect : '/'
  })
);

// twitter app settings - twitter.js
module.exports = {
    'apikey' : '<your_app_key>',
	'apisecret' : '<you_app_secret>',
	'callbackUrl' : 'http://127.0.0.1:3000/login/twitter/callback'
}

passport.use('twitter', new TwitterStrategy({
    consumerKey     : twitterConfig.apikey,
    consumerSecret  : twitterConfig.apisecret,
    callbackURL     : twitterConfig.callbackURL
  },
  function(token, tokenSecret, profile, done) {
    // make the code asynchronous
    // User.findOne won't fire until we have all our data back from Twitter
    process.nextTick(function() { 

	  User.findOne({ 'twitter.id' : profile.id }, 
        function(err, user) {
          // if there is an error, stop everything and return that
		  // ie an error connecting to the database
	      if (err)
	        return done(err);

			// if the user is found then log them in
	        if (user) {
	           return done(null, user); // user found, return that user
	        } else {
	           // if there is no user, create them
	           var newUser                 = new User();

			   // set all of the user data that we need
	           newUser.twitter.id          = profile.id;
	           newUser.twitter.token       = token;
	           newUser.twitter.username = profile.username;
	           newUser.twitter.displayName = profile.displayName;
	           newUser.twitter.lastStatus = profile._json.status.text;

			   // save our user into the database
	           newUser.save(function(err) {
	             if (err)
	               throw err;
	             return done(null, newUser);
	           });
	        }
	     });
	  });
    })
);

// route for twitter authentication and login
// different scopes while logging in
router.get('/login/twitter',  
  passport.authenticate('twitter')
);

// handle the callback after facebook has authenticated the user
router.get('/login/twitter/callback',
  passport.authenticate('twitter', {
	successRedirect : '/twitter',
	failureRedirect : '/'
  })
);

/* GET Twitter View Page */
router.get('/twitter', isAuthenticated, function(req, res){
  res.render('twitter', { user: req.user });
});