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server.js
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server.js
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const dotenv = require('dotenv').config();
const cookieParser = require('cookie-parser');
const express = require('express');
const fetch = require('node-fetch');
const Headers = require('node-fetch').Headers;
const http = require('http');
const next = require('next');
const { parse, URLSearchParams } = require('url');
/**
* generateRandomString from Spotify
* https://github.com/spotify/web-api-auth-examples
* Generates a random string containing numbers and letters
* @param {number} length The length of the string
* @return {string} The generated string
*/
const generateRandomString = length => {
let text = '';
let possible = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
for (var i = 0; i < length; i++) {
text += possible.charAt(Math.floor(Math.random() * possible.length));
}
return text;
};
const {
NEXT_PORT,
SPOTIFY_CLIENT,
SPOTIFY_SEC
} = process.env;
const dev = process.env.NODE_ENV !== 'production';
const nextApp = next({ dev });
const handle = nextApp.getRequestHandler();
/**
* Prepare, start and handles the Express server
* @return {void}
*/
nextApp.prepare().then(() => {
const app = express().use(cookieParser());
const server = http.createServer(app);
// Spotify Authentification
const stateKey = 'spotify_auth_state';
const state = generateRandomString(16);
const redirectUri = `http://localhost:${NEXT_PORT}/callback`;
/**
* User logs in and gives permission
* @return {void}
*/
app.get('/login', (req, res) => {
const scope = 'user-read-private playlist-read-private playlist-read-collaborative user-read-playback-state user-modify-playback-state user-read-currently-playing';
const loginParams = new URLSearchParams({
response_type: 'code',
client_id: `${SPOTIFY_CLIENT}`,
scope: scope,
redirect_uri: redirectUri,
state: state
});
res.cookie('spotify_auth_state', state);
res.redirect(`https://accounts.spotify.com/authorize?${loginParams}`);
nextApp.render(req, res, '/login', req.query)
})
/**
* Redirect and get access and refresh tokens
* Set token as cookie.
* @return {void}
*/
app.get('/callback', (req, res) => {
const code = req.query.code || null;
const state = req.query.state || null;
const storedState = req.cookies ? req.cookies['spotify_auth_state'] : null;
if (state === null && state !== storedState) {
const misParams = new URLSearchParams({
error: 'state_mismatch'
})
res.redirect(`/#${misParams}`)
}
else {
res.clearCookie(stateKey, state);
const searchParamsOptions = new URLSearchParams({
code: code,
redirect_uri: redirectUri,
grant_type: 'authorization_code'
});
fetch('https://accounts.spotify.com/api/token', {
method: 'POST',
headers: new Headers({
'Authorization': `Basic ${Buffer.from(`${SPOTIFY_CLIENT}:${SPOTIFY_SEC}`).toString('base64')}`,
'Content-Type': 'application/x-www-form-urlencoded',
}),
body: searchParamsOptions
}).then(response => {
if (response.status === 200 && response.ok) {
console.log(`> ⏆ Token fetch status Code: ${response.status}`);
return response.json();
} else {
console.log(`> 💥 Status Code: ${response.statusCode}`)
}
}).then(json => {
res.cookie('access', json.access_token);
res.cookie('refresh', json.refresh_token);
res.cookie('expiration', json.expires_in);
nextApp.render(req, res, '/callback', req.query);
});
}
})
app.get('/playlists/:id', (req, res) => {
const queryParams = {
id: req.params.id,
lang: req.cookies.lang
}
res.cookie('user_id', req.params.id);
nextApp.render(req, res, '/playlists', queryParams);
});
app.get('/tracks/:play_id', (req, res) => {
const queryParams = {
lang: req.cookies.lang,
play_id: req.params.play_id
};
nextApp.render(req, res, '/tracks', queryParams);
});
app.get('/', (req, res) => {
if (!req.cookies.access) {
res.redirect('/login')
}
const queryParams = {
lang: req.cookies.lang
}
nextApp.render(req, res, '/', queryParams);
});
app.get('*', (req, res) => {
const parsedUrl = parse(req.url, true);
const { pathname, query } = parsedUrl;
handle(req, res, parsedUrl);
});
server.listen(NEXT_PORT, 'localhost', err => {
if (err) {
console.log(`> ▲ Next Js server error ${err}`);
}
console.log(`
> ▲ Next Js server is running
> ▲ Server started on port: ${server.address().port}
`);
})
})