forked from alfiedouglas0/spotify-token-refresh
-
Notifications
You must be signed in to change notification settings - Fork 0
/
index.js
207 lines (187 loc) · 6.07 KB
/
index.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
//code from https://github.com/lufinkey/react-native-spotify/blob/master/example-server/index.js
// npm deps
const express = require('express');
const https = require('https');
const crypto = require('crypto');
const {
URL
} = require('url');
const QueryString = require('querystring');
// Require the framework and instantiate it
const app = express();
// init spotify config
const spClientId = process.env.SPOTIFY_CLIENT_ID;
const spClientSecret = process.env.SPOTIFY_CLIENT_SECRET;
const spClientCallback = process.env.SPOTIFY_CLIENT_CALLBACK;
const authString = Buffer.from(spClientId + ':' + spClientSecret).toString('base64');
const authHeader = `Basic ${authString}`;
const spotifyEndpoint = 'https://accounts.spotify.com/api/token';
// encryption
const encSecret = process.env.ENCRYPTION_SECRET;
const encMethod = process.env.ENCRYPTION_METHOD || "aes-256-ctr";
const IV_LENGTH = 16;
const encrypt = (text) => {
let iv = crypto.randomBytes(IV_LENGTH);
let cipher = crypto.createCipheriv(encMethod, spClientSecret, iv);
let encrypted = cipher.update(text);
encrypted = Buffer.concat([encrypted, cipher.final()]);
return iv.toString('hex') + ':' + encrypted.toString('hex');
};
const decrypt = (text) => {
let textParts = text.split(':');
let iv = Buffer.from(textParts.shift(), 'hex');
let encryptedText = Buffer.from(textParts.join(':'), 'hex');
let decipher = crypto.createDecipheriv(encMethod, spClientSecret, iv);
let decrypted = decipher.update(encryptedText);
decrypted = Buffer.concat([decrypted, decipher.final()]);
return decrypted.toString();
};
// handle sending POST request
function postRequest(url, data = {}) {
return new Promise((resolve, reject) => {
// build request data
url = new URL(url);
const reqData = {
protocol: url.protocol,
hostname: url.hostname,
port: url.port,
path: url.pathname,
method: 'POST',
headers: {
'Authorization': authHeader,
'Content-Type': 'application/x-www-form-urlencoded'
}
}
// create request
const req = https.request(reqData, (res) => {
// build response
let buffers = [];
res.on('data', (chunk) => {
buffers.push(chunk);
});
res.on('end', () => {
// parse response
let result = null;
try {
result = Buffer.concat(buffers);
result = result.toString();
var contentType = res.headers['content-type'];
if (typeof contentType == 'string') {
contentType = contentType.split(';')[0].trim();
}
if (contentType == 'application/x-www-form-urlencoded') {
result = QueryString.parse(result);
} else if (contentType == 'application/json') {
result = JSON.parse(result);
}
} catch (error) {
error.response = res;
error.data = result;
reject(error);
return;
}
resolve({
response: res,
result: result
});
});
});
// handle error
req.on('error', (error) => {
reject(error);
});
// send
data = QueryString.stringify(data);
req.write(data);
req.end();
});
}
// support form body
app.use(express.urlencoded({
extended: false
}));
/**
* Swap endpoint
* Uses an authentication code on body to request access and refresh tokens
*/
app.post('/swap', async (req, res) => {
try {
// build request data
const reqData = {
grant_type: 'authorization_code',
redirect_uri: spClientCallback,
code: req.body.code
};
// get new token from Spotify API
const {
response,
result
} = await postRequest(spotifyEndpoint, reqData);
// encrypt refresh_token
if (result.refresh_token) {
result.refresh_token = encrypt(result.refresh_token);
}
// send response
res.status(response.statusCode).json(result);
} catch (error) {
if (error.response) {
res.status(error.response.statusCode);
} else {
res.status(500);
}
if (error.data) {
res.send(error.data);
} else {
res.send("");
}
}
});
/**
* Refresh endpoint
* Uses the refresh token on request body to get a new access token
*/
app.post('/refresh', async (req, res) => {
try {
// ensure refresh token parameter
if (!req.body.refresh_token) {
res.status(400).json({
error: 'Refresh token is missing from body'
});
return;
}
// decrypt token
const refreshToken = decrypt(req.body.refresh_token);
// build request data
const reqData = {
grant_type: 'refresh_token',
refresh_token: refreshToken
};
// get new token from Spotify API
const {
response,
result
} = await postRequest(spotifyEndpoint, reqData);
// encrypt refresh_token
if (result.refresh_token) {
result.refresh_token = encrypt(result.refresh_token);
}
// send response
res.status(response.statusCode).json(result);
} catch (error) {
if (error.response) {
res.status(error.response.statusCode);
} else {
res.status(500);
}
if (error.data) {
res.send(error.data);
} else {
res.send("");
}
}
});
// start server
const spServerPort = process.env.PORT ? parseInt(process.env.PORT) : 3000;
app.listen(spServerPort, () => {
console.log('Example app listening on port ' + spServerPort + '!');
});