<?php
if($_SERVER['HTTP_X_GITLAB_TOKEN'] == 'RG5sd9W1G95cH5i9uisfddfRV1QhdsfbBrK64xmw32d') {
    $request = json_decode(file_get_contents('php://input'));
    if($request->ref == 'refs/heads/master') {
        $gitMessage = shell_exec('git pull origin master');
        file_put_contents(
            __DIR__ . '/git.log',
            var_export($gitMessage, true),
            FILE_APPEND
        );
    }
} else  {
    http_response_code(403);
}