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server.js
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server.js
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const express = require('express');
const axios = require('axios');
const querystring = require('querystring');
const dotenv = require('dotenv');
const path = require('path');
dotenv.config();
const app = express();
const port = 3000;
const CLIENT_ID = process.env.CLIENT_ID;
const CLIENT_SECRET = process.env.CLIENT_SECRET;
const REDIRECT_URI = process.env.REDIRECT_URI;
let accessToken = '';
let refreshToken = '';
let tokenExpiry = 0;
let cachedTrackId = null;
let cachedTempo = null;
app.use(express.static(path.join(__dirname, 'public')));
app.get('/login', (req, res) => {
const scopes = 'user-read-playback-state';
const spotifyAuthUrl = 'https://accounts.spotify.com/authorize?' +
querystring.stringify({
response_type: 'code',
client_id: CLIENT_ID,
scope: scopes,
redirect_uri: REDIRECT_URI,
});
res.redirect(spotifyAuthUrl);
});
app.get('/callback', async (req, res) => {
const code = req.query.code || null;
if (!code) {
return res.send('No code provided');
}
try {
const tokenResponse = await axios.post('https://accounts.spotify.com/api/token', querystring.stringify({
grant_type: 'authorization_code',
code: code,
redirect_uri: REDIRECT_URI,
client_id: CLIENT_ID,
client_secret: CLIENT_SECRET,
}), {
headers: {
'Content-Type': 'application/x-www-form-urlencoded'
}
});
const { access_token, refresh_token: newRefreshToken, expires_in } = tokenResponse.data;
accessToken = access_token;
refreshToken = newRefreshToken;
tokenExpiry = Date.now() + (expires_in * 1000);
console.log('Access token acquired:', accessToken);
res.redirect('/');
} catch (error) {
console.error('Error exchanging code for tokens:', error.response ? error.response.data : error.message);
res.send('Error retrieving tokens');
}
});
app.get('/refresh_token', async (req, res) => {
try {
if (!refreshToken) {
throw new Error('No refresh token available');
}
const tokenResponse = await axios.post('https://accounts.spotify.com/api/token', querystring.stringify({
grant_type: 'refresh_token',
refresh_token: refreshToken,
client_id: CLIENT_ID,
client_secret: CLIENT_SECRET,
}), {
headers: {
'Content-Type': 'application/x-www-form-urlencoded'
}
});
const { access_token, expires_in } = tokenResponse.data;
accessToken = access_token;
tokenExpiry = Date.now() + (expires_in * 1000);
console.log('Access token refreshed:', accessToken);
res.json({ access_token, expires_in });
} catch (error) {
console.error('Error refreshing token:', error.response ? error.response.data : error.message);
res.send('Error refreshing token');
}
});
app.use(async (req, res, next) => {
if (Date.now() > tokenExpiry - 60 * 1000) {
try {
await refreshAccessToken();
} catch (error) {
console.error('Error refreshing token in middleware:', error.message);
}
}
next();
});
async function refreshAccessToken() {
try {
if (!refreshToken) {
throw new Error('No refresh token available');
}
const tokenResponse = await axios.post('https://accounts.spotify.com/api/token', querystring.stringify({
grant_type: 'refresh_token',
refresh_token: refreshToken,
client_id: CLIENT_ID,
client_secret: CLIENT_SECRET,
}), {
headers: {
'Content-Type': 'application/x-www-form-urlencoded'
}
});
const { access_token, expires_in } = tokenResponse.data;
accessToken = access_token;
tokenExpiry = Date.now() + (expires_in * 1000);
console.log('Access token refreshed:', accessToken);
} catch (error) {
console.error('Error refreshing token:', error.response ? error.response.data : error.message);
}
}
async function getTrackTempo() {
if (!accessToken) {
throw new Error('Access token not available');
}
try {
const playbackStateResponse = await axios.get('https://api.spotify.com/v1/me/player/currently-playing', {
headers: {
'Authorization': `Bearer ${accessToken}`
}
});
if (playbackStateResponse.data && playbackStateResponse.data.item) {
const trackId = playbackStateResponse.data.item.id;
if (trackId !== cachedTrackId) {
console.log('New track detected, fetching tempo...');
const trackResponse = await axios.get(`https://api.spotify.com/v1/audio-features/${trackId}`, {
headers: {
'Authorization': `Bearer ${accessToken}`
}
});
const tempo = trackResponse.data.tempo || 'Tempo data not available';
console.log('Track has changed, using fetched tempo: ', tempo)
cachedTrackId = trackId;
cachedTempo = tempo;
} else {
console.log('Track has not changed, using cached tempo: ', cachedTempo);
return -998;
}
return cachedTempo;
} else {
throw new Error('No track currently playing');
}
} catch (error) {
console.error('Error fetching track tempo:', error.response ? error.response.data : error.message);
throw new Error('Failed to fetch track tempo');
}
}
app.get('/tempo', async (req, res) => {
try {
const tempo = await getTrackTempo();
res.json({ tempo });
} catch (error) {
console.error('Error in /tempo:', error.message);
res.status(500).send('Error fetching track tempo');
}
});
app.listen(port, () => {
console.log(`Server listening at http://localhost:${port}`);
});