var
        https = require('https'),
        AdmZip = require('adm-zip'),
        app = require('express')();

app.get("/*", function(req, res) {

    var
            parts = req.params[0].split('/'),
            owner = parts[0],
            repo = parts[1],
            branch = parts[2],
            top_dir = repo + '-' + branch + '/',
            zip_address = 'https://nodeload.github.com/' + owner + '/' + repo + '/zip/' + branch;

    https.get(zip_address, function(response) {
        var data = [], dataLen = 0;
        response.on('data', function(chunk) {

            data.push(chunk);
            dataLen += chunk.length;

        }).on('end', function() {
            var buf = new Buffer(dataLen);
            for (var i = 0, len = data.length, pos = 0; i < len; i++) {
                data[i].copy(buf, pos);
                pos += data[i].length;
            }
            var zip = new AdmZip(buf);

            // Modify zip file, to remove the top-level directory

            var out = zip.toBuffer();
            res.header('Content-Type', 'application/zip');
            res.header('Content-Disposition', 'attachment; filename="' + repo + '.zip"');
            res.send(out);
        });

    });

});

app.listen(3000);