Simple standalone deploy server written on Node.js

deploy.js

var childProcess = require('child_process');
var http = require('http');
var util = require('util');
var path = require('path');
var fs = require('fs');

var listen = process.env.LISTEN || 8000;
var home = process.env.HOME;
var key = process.env.DEPLOY_KEY;

if (!key) {
    var crypto = require('crypto');
    var random = crypto.randomBytes(128);
    key = crypto.createHash('sha1').update(random).digest('hex');
    console.info('Generated key: %s', key);
}

var server = http.createServer(function(req, res) {
    if (req.url.indexOf('key=' + key) === -1) {
        res.writeHead(403);
        res.end();
        return;
    }

    var _path = path.join(home, req.url.replace(/\?.+/, '').replace('/deploy', ''));
    var _gitPath = path.join(_path, '.git');

    fs.exists(_gitPath, function(exists) {
        if (!exists) {
            res.writeHead(404);
            res.end(JSON.stringify({
                error: 'Deploy target not exists!'
            }));
            return;
        }

        childProcess.exec('git pull', {
            cwd: _path,
            timeout: 60 * 1000,
            encoding: 'utf-8'
        }, function (err, stdout, stderr) {
            res.writeHead(err ? 500 : 200);
            res.end(JSON.stringify({
                error: err,
                stdout: stdout,
                stderr: stderr
            }))
        });
    });
});

server.listen(listen);