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app.js
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app.js
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var express = require('express');
var request = require('request');
var cors = require('cors');
var querystring = require('querystring');
var cookieParser = require('cookie-parser');
var client_id = '';
var client_secret = '';
var redirect_uri = 'https://moody-spotify.herokuapp.com/callback';
/**
* 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(cors())
.use(cookieParser());
app.get('/login', function(req, res) {
var state = generateRandomString(16);
res.cookie(stateKey, state);
var scope = 'user-read-private user-read-email user-top-read';
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) {
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;
var options = {
url: 'https://api.spotify.com/v1/me/top/tracks',
headers: { 'Authorization': 'Bearer ' + access_token ,"Accept": "application/json",
"Content-Type": "application/json",},
json: true
};
res.redirect('../home.html?' +
querystring.stringify({
access_token: access_token,
refresh_token: refresh_token
}));
} else {
res.redirect('/#' +
querystring.stringify({
error: 'invalid_token'
}));
}
});
}
});
app.get('/refresh_token', function(req, res) {
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
});
}
});
});
console.log('Listening on Heroku port');
app.listen(process.env.PORT || 5000);