authenticate.js

var passport = require('passport');
var LocalStrategy = require('passport-local');
var User = require('./models/user');
var JwtStrategy = require('passport-jwt').Strategy;
var ExtractJwt = require('passport-jwt').ExtractJwt;
var jwt = require('jsonwebtoken');
var FacebookTokenStrategy = require('passport-facebook-token');

var config = require('./config');

exports.local = passport.use(new LocalStrategy(User.authenticate()));
passport.serializeUser(User.serializeUser());
passport.deserializeUser(User.deserializeUser());

exports.getToken = function(user) {
    return jwt.sign(user, config.secretKey, {expiresIn: 3600});
};

var opts = {};
opts.jwtFromRequest = ExtractJwt.fromAuthHeaderAsBearerToken();
opts.secretOrKey = config.secretKey;

exports.jwtPassport = passport.use(new JwtStrategy(opts,
    (jwt_payload, done) => {
        console.log('JWT payload: ', jwt_payload);
        User.findOne({_id: jwt_payload._id}, (err, user) => {
            if(err){
                return done(err, false);
            } else if(user){
                return done(null, user);
            } else {
                return done(null, false);
            }
        });
    }));

exports.verifyUser = passport.authenticate('jwt', {session: false});

exports.verifyAdmin = function(params, err, next) {
    if (params.user.admin){
      return next();
    } else {
      var err = new Error('Only administrators are authorized to perform this operation.');
      err.status = 403;
      return next(err);
    }
};

exports.facebookPassport = passport.use(new FacebookTokenStrategy({
    clientID: config.facebook.clientId,
    clientSecret: config.facebook.clientSecret
}, (accessToken, refreshToken, profile, done) => {
    User.findOne({facebookId: profile.id}, (err, user) => {
        if (err) {
            return done(err, false);
        }
        if (!err && user !== null) {
            return done(null, user);
        }
        else {
            user = new User({ username: profile.displayName });
            user.facebookId = profile.id;
            user.firstname = profile.name.givenName;
            user.lastname = profile.name.familyName;
            user.save((err, user) => {
                if (err)
                    return done(err, false);
                else
                    return done(null, user);
            })
        }
    });
}
));