A snippet of my Express.Route for OAuth

index.js

/*
Some extra stuff for setting up the server
*/

    // Setting up bare passport. No Auth Strategy.
        const passport = require("./middlewear/my-passport-init");
        app.use(passport.initialize());
        app.use(passport.session());

    // Setting up passport Strategies and Routes
        app.use(require("./middlewear/my-passport-routes"));

/*
Below is where I setup all my extra little routes and staticly public files
*/

my-passport-routes.js

const passport = require("passport");
const Router = require("express").Router;

const app = new Router();

// Setting Google Auth Strategy on passport and required auth routes.
const passport_google = require("./passport-google");
passport.use(passport_google.getStrategy());
app.use(passport_google.getRoutes());

// Setting Facebook Auth Strategy on passport and required auth routes.
const passport_facebook = require("./passport-facebook");
passport.use(passport_facebook.getStrategy());
app.use(passport_facebook.getRoutes());

// Setting Twitter Auth Strategy on passport and required auth routes.
const passport_twitter = require("./passport-twitter");
passport.use(passport_twitter.getStrategy());
app.use(passport_twitter.getRoutes());

// Setting Twitter Auth Strategy on passport and required auth routes.
const passport_github = require("./passport-github");
passport.use(passport_github.getStrategy());
app.use(passport_github.getRoutes());

module.exports = app;

passport-github.js

const Router = require("express").Router;
const passport = require("passport");
const Strategy = require("passport-github").Strategy;
const User = require("../lib/mongoUtil").collection("User");
const ObjectID = require("mongodb").ObjectID;

const oauth_options = {
    "clientID":		process.env.GITHUB_AUTH_CLIENT_ID,
    "clientSecret":	process.env.GITHUB_AUTH_CLIENT_SECRET,
    "callbackURL":	process.env.GITHUB_AUTH_CALLBACK_URL,
    "passReqToCallback": true
};

const strategy = new Strategy(oauth_options, function (req, accessToken, refreshToken, profile, cb) {
	delete profile._raw;
    let user = req.user;
    if ( user ) {
        User.findOneAndUpdate(
            { "_id": user._id },
            { "$set": { "github_profile": profile, "github_token": accessToken } },
            { "returnOriginal": false }
        )
        .then(doc => doc.value)
        .then(user => cb(null, user))
        .catch(err => {
            console.error("Error:", err);
            cb(err);
        });
      
    } else {
        User.findOneAndUpdate(
            { "github_profile.id" : profile.id, },      // Query
            { "$set" : { "github_profile": profile, "github_token": accessToken } }, // Update
            { "upsert": true, "returnOriginal": false } // Options
        )
        .then(doc => doc.value) // TODO: Test for errors here.
        .then(user => cb(null, user))
        .catch(err => {
            console.error("Error:", err);
            cb(err);
        });
    }
});

const app = new Router();
app.get('/auth/github', passport.authenticate('github'));
app.get('/auth/github/callback', passport.authenticate('github', { "successReturnToOrRedirect": "/", "failureRedirect": '/login' }));

module.exports.getStrategy = function () {
    return strategy
};

module.exports.getRoutes = function (options) {
    return app;
};