Handle Github Webhook using PHP(Laravel/Lumen Framework)

WebhookController.php

<?php

namespace App\Http\Controllers;

use Log;
use Illuminate\Http\Request;
use Symfony\Component\Process\Process;
use Laravel\Lumen\Routing\Controller as BaseController;

class WebhookController extends BaseController
{
    private $body;
    private $request;
    private $message;
    private $gitHubEvent;
    private $gitHubSignature;

    public function __construct(Request $request)
    {
        $this->request = $request;
        $this->prepareParameter();
    }

    public function index()
    {
        if ($this->isPostRequestValid()) {
            $process = new Process('cd /your/repo/path && sudo git fetch origin && sudo git merge origin master');
            $process->run();

            if ($process->isSuccessful()) {
                Log::info($process->getOutput());
                $this->message = 'Code updated.';
            } else {
                Log::info($process->getErrorOutput());
                $this->message = 'Something went wrong';
            }
        }

        return $this->message;
    }

    private function isPostRequestValid()
    {
        if ($this->gitHubEvent !== 'push') {
            Log::info('Github Repository Event Not ALLOWED');
            $this->message = 'Github Repository Event Not ALLOWED';

            return false;
        }

        $computedSignature = 'sha1=' . hash_hmac('sha1', $this->body, $_ENV['GITHUB_HOOK_SECRET_TOKEN']);

        if (! hash_equals($computedSignature, $this->gitHubSignature)) {
            Log::info('Github Signature NOT Match');
            $this->message = 'Github Signature NOT Match';

            return false;
        }

        return true;
    }

    private function prepareParameter()
    {
        $headers = $this->request->headers->all();
        $this->gitHubEvent = $headers['x-github-event'][0] ?? null;
        $this->gitHubSignature = $headers['x-hub-signature'][0] ?? null;

        $this->body = $this->request->getContent() ?? '';
    }
}