Create server.js

server.js

@@ -0,0 +1,48 @@
+const express = require('express');
+const fetch = require('node-fetch');
+const querystring = require('querystring');
+const app = express();
+const port = 7860;
+
+const clientId = process.env.SPOTIFY_CLIENT_ID;
+const clientSecret = process.env.SPOTIFY_CLIENT_SECRET;
+const redirectUri = process.env.SPOTIFY_REDIRECT_URI;
+
+app.use(express.static('public'));
+
+app.get('/login', (req, res) => {
+  const scope = 'user-read-private user-read-email';
+  res.redirect('https://accounts.spotify.com/authorize?' +
+    querystring.stringify({
+      response_type: 'code',
+      client_id: clientId,
+      scope: scope,
+      redirect_uri: redirectUri,
+    }));
+});
+
+app.get('/callback', async (req, res) => {
+  const code = req.query.code || null;
+  const authOptions = {
+    method: 'POST',
+    headers: {
+      'Authorization': 'Basic ' + (Buffer.from(clientId + ':' + clientSecret).toString('base64')),
+      'Content-Type': 'application/x-www-form-urlencoded'
+    },
+    body: querystring.stringify({
+      code: code,
+      redirect_uri: redirectUri,
+      grant_type: 'authorization_code'
+    })
+  };
+
+  const response = await fetch('https://accounts.spotify.com/api/token', authOptions);
+  const data = await response.json();
+  const token = data.access_token;
+
+  res.redirect('/#' + querystring.stringify({ access_token: token }));
+});
+
+app.listen(port, () => {
+  console.log(`App listening at http://localhost:${port}`);
+});