DAVIDS/authorization_code/app.js

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/**
* 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
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* https://developer.spotify.com/web-api/authorization-guide/#authorization_code_flow
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*/
var express = require('express'); // Express web server framework
var request = require('request'); // "Request" library
var querystring = require('querystring');
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var cookieParser = require('cookie-parser');
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var client_id = '03ffe0cac0a0401aa6673c3cf6d02ced'; // Your client id
var client_secret = 'a57c43efb9644574a96d6623fb8bfbc2'; // Your client secret
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var redirect_uri = 'http://localhost:8888/callback'; // Your redirect uri
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/**
* 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';
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var app = express();
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app.use(express.static(__dirname + '/public'))
.use(cookieParser());
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app.get('/login', function(req, res) {
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var state = generateRandomString(16);
res.cookie(stateKey, state);
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// your application requests authorization
var scope = 'user-read-private user-read-email';
res.redirect('https://accounts.spotify.com/authorize?' +
querystring.stringify({
response_type: 'code',
client_id: client_id,
scope: scope,
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redirect_uri: redirect_uri,
state: state
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}));
});
app.get('/callback', function(req, res) {
// your application requests refresh and access tokens
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// 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',
client_id: client_id,
client_secret: client_secret
},
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',
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('/#' +
querystring.stringify({
access_token: access_token,
refresh_token: refresh_token
}));
} else {
res.redirect('/#' +
querystring.stringify({
error: 'invalid_token'
}));
}
});
}
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});
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')) },
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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 8888');
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app.listen(8888);