old_contents: 'use strict';
  var express = require('express');
  var path = require('path');
  // var favicon = require('serve-favicon');
  var logger = require('morgan');
  var cookieParser = require('cookie-parser');
  var bodyParser = require('body-parser');
  var session = require('express-session');
  var passport = require('passport');
  var SpotifyStrategy = require('passport-spotify').Strategy;
  
  var keys = require('./keys');
  var routes = require('./routes/index');
  var fb = require('./routes/fb');
  
  var app = express();
  
  // view engine setup
  app.set('views', path.join(__dirname, 'views'));
  app.set('view engine', 'ejs');
  
  // uncomment after placing your favicon in /public
  //app.use(favicon(path.join(__dirname, 'public', 'favicon.ico')));
  app.use(logger('dev'));
  app.use(bodyParser.json());
  app.use(bodyParser.urlencoded({ extended: false }));
  app.use(cookieParser());
  app.use(session(
    { secret: 'keyboard cat',
      saveUninitialized: false,
      resave: false }
  ));
  // Initialize Passport!  Also use passport.session() middleware, to support
  // persistent login sessions (recommended).
  app.use(passport.initialize());
  app.use(passport.session());
  app.use(express.static(path.join(__dirname, 'public')));
  
  app.use('/', routes);
  app.use('/', fb);
  
  // catch 404 and forward to error handler
  app.use(function(req, res, next) {
    var err = new Error('Not Found');
    err.status = 404;
    next(err);
  });
  
  // error handlers
  
  // development error handler
  // will print stacktrace
  if (app.get('env') === 'development') {
    app.use(function(err, req, res, next) {
      res.status(err.status || 500);
      res.render('error', {
        message: err.message,
        error: err
      });
    });
  }
  
  // production error handler
  // no stacktraces leaked to user
  app.use(function(err, req, res, next) {
    res.status(err.status || 500);
    res.render('error', {
      message: err.message,
      error: {}
    });
  });
  
  
  passport.use(new SpotifyStrategy({
    clientID: keys.SPOTIFY_ID,
    clientSecret: keys.SPOTIFY_SECRET,
    callbackURL: keys.SPOTIFY_CB
  },
  function(accessToken, refreshToken, profile, done) {
    profile.accessToken = accessToken;
    profile.refreshToken = refreshToken;
    return done(null, profile);
  }));
  
  passport.serializeUser(function(user, done) {
    done(null, user);
  });
  
  passport.deserializeUser(function(obj, done) {
    done(null, obj);
  });
  
  
  module.exports = app;
  
new_contents: 'use strict';
  var express = require('express');
  var path = require('path');
  // var favicon = require('serve-favicon');
  var logger = require('morgan');
  var cookieParser = require('cookie-parser');
  var bodyParser = require('body-parser');
  var session = require('express-session');
  var passport = require('passport');
  var SpotifyStrategy = require('passport-spotify').Strategy;
  
  var keys = require('./keys');
  var routes = require('./routes/index');
  var fb = require('./routes/fb');
  
  var app = express();
  
  // view engine setup
  app.set('views', path.join(__dirname, 'views'));
  app.set('view engine', 'ejs');
  
  // uncomment after placing your favicon in /public
  //app.use(favicon(path.join(__dirname, 'public', 'favicon.ico')));
  app.use(logger('dev'));
  app.use(bodyParser.json());
  app.use(bodyParser.urlencoded({ extended: false }));
  app.use(cookieParser());
  app.use(session(
    { secret: 'keyboard cat',
      saveUninitialized: false,
      resave: false }
  ));
  // Initialize Passport!  Also use passport.session() middleware, to support
  // persistent login sessions (recommended).
  app.use(passport.initialize());
  app.use(passport.session());
  app.use(express.static(path.join(__dirname, 'public')));
  
  app.use('/', routes);
  app.use('/bot', fb);
  
  // catch 404 and forward to error handler
  app.use(function(req, res, next) {
    var err = new Error('Not Found');
    err.status = 404;
    next(err);
  });
  
  // error handlers
  
  // development error handler
  // will print stacktrace
  if (app.get('env') === 'development') {
    app.use(function(err, req, res, next) {
      res.status(err.status || 500);
      res.render('error', {
        message: err.message,
        error: err
      });
    });
  }
  
  // production error handler
  // no stacktraces leaked to user
  app.use(function(err, req, res, next) {
    res.status(err.status || 500);
    res.render('error', {
      message: err.message,
      error: {}
    });
  });
  
  
  passport.use(new SpotifyStrategy({
    clientID: keys.SPOTIFY_ID,
    clientSecret: keys.SPOTIFY_SECRET,
    callbackURL: keys.SPOTIFY_CB
  },
  function(accessToken, refreshToken, profile, done) {
    profile.accessToken = accessToken;
    profile.refreshToken = refreshToken;
    return done(null, profile);
  }));
  
  passport.serializeUser(function(user, done) {
    done(null, user);
  });
  
  passport.deserializeUser(function(obj, done) {
    done(null, obj);
  });
  
  
  module.exports = app;
  
subject: Change fb to use a different prefix