app.js

/**
 * This is an example of a basic node.js script that performs
 * the Authorization Code oAuth2 flow to authenticate against
 * the Spotify Accounts.
 *
 * For more information, read
 * https://developer.spotify.com/web-api/authorization-guide/#authorization_code_flow
 */

var express = require('express'); // Express web server framework
var request = require('request'); // "Request" library
var querystring = require('querystring');
var cookieParser = require('cookie-parser');
require('dotenv').config()
let secretToken = process.env.secret

var client_id = 'd066da8f781c4143abecda75f0fdeeab'; // Your client id
var client_secret = secretToken; // Your secret
var redirect_uri = 'http://ryanpfrazier-rediscover.herokuapp.com/callback'; // Your redirect uri

/**
 * Generates a random string containing numbers and letters
 * @param  {number} length The length of the string
 * @return {string} The generated string
 */
var generateRandomString = function (length) {
  var text = '';
  var possible = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';

  for (var i = 0; i < length; i++) {
    text += possible.charAt(Math.floor(Math.random() * possible.length));
  }
  return text;
};

var stateKey = 'spotify_auth_state';

var app = express();

app.use(express.static(__dirname + '/public'))
  .use(cookieParser());

app.get('/login', function (req, res) {
  var state = generateRandomString(16);
  res.cookie(stateKey, state);

  // your application requests authorization
  var scope = 'user-top-read playlist-modify-public playlist-modify-private';
  res.redirect('https://accounts.spotify.com/authorize?' +
    querystring.stringify({
      response_type: 'code',
      client_id: client_id,
      scope: scope,
      redirect_uri: redirect_uri,
      state: state
    }));
});

app.get('/callback', function (req, res) {

  // your application requests refresh and access tokens
  // after checking the state parameter

  var code = req.query.code || null;
  var state = req.query.state || null;
  var storedState = req.cookies ? req.cookies[stateKey] : null;

  if (state === null || state !== storedState) {
    res.redirect('/#' +
      querystring.stringify({
        error: 'state_mismatch'
      }));
  } else {
    res.clearCookie(stateKey);
    var authOptions = {
      url: 'https://accounts.spotify.com/api/token',
      form: {
        code: code,
        redirect_uri: redirect_uri,
        grant_type: 'authorization_code'
      },
      headers: {
        'Authorization': 'Basic ' + (new Buffer(client_id + ':' + client_secret).toString('base64'))
      },
      json: true
    };

    request.post(authOptions, function (error, response, body) {
      if (!error && response.statusCode === 200) {

        var access_token = body.access_token,
          refresh_token = body.refresh_token;
        res.cookie('accessToken', access_token);
        var options = {
          url: 'https://api.spotify.com/v1/me',
          headers: {
            'Authorization': 'Bearer ' + access_token
          },
          json: true
        };

        // use the access token to access the Spotify Web API
        request.get(options, function (error, response, body) {
          // console.log(body);
        });

        // we can also pass the token to the browser to make requests from there
        res.redirect('/homepage.html'
          // querystring.stringify({
          //   access_token: access_token,
          //   refresh_token: refresh_token
          // })
        );
        // console.log(access_token);
      } else {
        res.redirect('/#' +
          querystring.stringify({
            error: 'invalid_token'
          }));
      }
    });
  }
});

app.get('/refresh_token', function (req, res) {

  // requesting access token from refresh token
  var refresh_token = req.query.refresh_token;
  var authOptions = {
    url: 'https://accounts.spotify.com/api/token',
    headers: {
      'Authorization': 'Basic ' + (new Buffer(client_id + ':' + client_secret).toString('base64'))
    },
    form: {
      grant_type: 'refresh_token',
      refresh_token: refresh_token
    },
    json: true
  };

  request.post(authOptions, function (error, response, body) {
    if (!error && response.statusCode === 200) {
      var access_token = body.access_token;
      res.send({
        'access_token': access_token
      });
    }
  });
});

const port = process.env.PORT || 8888;
app.listen(port, () => {
  console.log('Listening on port', port)
});

module.exports = app;