Laravel 4.2 Push-to-Deploy controller for GitHub webhooks

DeployController.php

<?php

/**
 * Deployment controller
 *
 * @author Stichoza <me@stichoza.com>
 */
class DeployController extends BaseController
{

	const DEPLOY_SECRET_KEY = 'YOUR-GITHUB-WEBHOOK-SECRET-KEY-HERE';

	private $deployStatus = false;

	public static $sshLog = [];
	
	private $errorMsg = 'Message not set';

	private $payload = [];

	private static $commands = [
		'uptime',
		'whoami',
		'cd /var/www/stichoza.com',
		'php artisan down',
		'git reset --hard HEAD',
		'git pull github master',
		'php artisan migrate',
		'php artisan up'
	];

	public static function log($str) {
		self::$sshLog[] = [
			'time' => microtime(1),
			'output' => $str
		];
	}

	/**
	 * This should be in laravel framework
	 */
	public static function getRequestBody() {
		return @file_get_contents('php://input');
		// File::get('php://input'); // This does not work!
	}

	/**
	 * 
	 */
	private function checkHMAC() {
		$sign = substr(Request::header('X-Hub-Signature', 'sha1=null'), 5);
		$hmac = hash_hmac('sha1', self::getRequestBody(), self::DEPLOY_SECRET_KEY);
		return $sign == $hmac;
	}

	private function fail($errorMsg) {
		return $this->makeResponse(false, $errorMsg);
	}

	private function makeResponse($status = null, $errorMsg = null) {
		if ($status !== null) $this->deployStatus = !!$status;
		if (!empty($errorMsg)) $this->errorMsg = $errorMsg;
		$response = ['deployed' => $this->deployStatus];
		if (!empty($this->errorMsg)) {
			$response['message'] = $this->errorMsg;
		}
		if (count(self::$sshLog)) {
			$response['log'] = self::$sshLog;
		}
		return $response;
	}

	/**
	 * Deploy from github
	 *
	 * @access public
	 * @return array
	 */
	public function deploy() {

		
		// Require HTTPS
		if (!Request::secure()) return $this->fail('HTTPS required');

		try {
			$this->payload = json_decode(self::getRequestBody());
		} catch (Exception $e) {
			return $this->fail('Payload decoding failed.');
		}

		// Check HMAC signature
		if (!$this->checkHMAC()) return $this->fail('Invalid secret key');

		// Abort if pushed on nonmaster
		if ($this->payload->ref != 'refs/heads/master')
			return $this->fail('Not on master branch');
		
		self::log('Deployment started');

		// Execute commands and log output
		SSH::into('capsule')->run(self::$commands, function($line) {
			self::log(trim($line));
		});

		return $this->makeResponse(true, 'Deployment finnished');
	}

}