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const express = require('express'),
    bodyParser = require('body-parser'),
    path = require('path'),
    fs = require('fs'),
    app = express();
    
const port = process.env.PORT || 8000;
    
app.get('/', (req, res) => {
    res.sendFile(__dirname + '/index.html');
});

app.get('/stream', (req, res) => {
    const file = __dirname + '/public/audio/audio1.mp3';
    const stat = fs.statSync(file);
    const total = stat.size;
    if (req.headers.range) {

    }
    fs.exists(file, (exists) => {
        if (exists) {
            const range = req.headers.range;
            const parts = range.replace(/bytes=/, '').split('-');
            const partialStart = parts[0];
            const partialEnd = parts[1];

            const start = parseInt(partialStart, 10);
            const end = partialEnd ? parseInt(partialEnd, 10) : total - 1;
            const chunksize = (end - start) + 1;
            const rstream = fs.createReadStream(file, {start: start, end: end});
            
            
            res.writeHead(206, {
                'Content-Range': 'bytes ' + start + '-' + end + '/' + total,
                'Accept-Ranges': 'bytes', 'Content-Length': chunksize,
                'Content-Type': 'audio/mpeg'
            });
            rstream.pipe(res);

        } else {
            res.send('Error - 404');
            res.end();
            // res.writeHead(200, { 'Content-Length': total, 'Content-Type': 'audio/mpeg' });
            // fs.createReadStream(path).pipe(res);
        }
    });
});

app.get('/download', (req, res) => {
    const file = __dirname + '/public/audio/audio1.mp3';
    res.download(file);
});

app.listen(port, () => {
  console.log(`Example app listening at http://localhost:${port}`)
})
