PHP Github Webhook Template

hook.php

<?php
function sh ($cmd, $cwd) {
  $descriptorspec = array(
    1 => array('pipe', 'w'), // stdout is a pipe that the child will write to
    2 => array('pipe', 'w') // stderr
  );
  $resource = proc_open($cmd, $descriptorspec, $pipes, $cwd);
  if (is_resource($resource)) {
    $output = stream_get_contents($pipes[2]);
    $output .= PHP_EOL;
    $output .= stream_get_contents($pipes[1]);
    $output .= PHP_EOL;
    fclose($pipes[1]);
    fclose($pipes[2]);
    proc_close($resource);
    return $output;
  }
}

$secret = '{AHEM}';
$sig = explode('=', $_SERVER['HTTP_X_HUB_SIGNATURE']);
$payload = file_get_contents('php://input');
if ($sig[1] == hash_hmac($sig[0], $payload, $secret) && $_SERVER['HTTP_X_GITHUB_EVENT'] == 'push') {
  $load = json_decode($payload, true);
  if ($load['ref'] != 'refs/heads/master') {
    file_put_contents('gh-hook.log', '[SKIP] '.$_SERVER['REMOTE_ADDR'].' on '.$load['ref'].PHP_EOL, FILE_APPEND);
    die;
  }
  sh('git pull -q origin master', '/home/theexoni/public_html');
  file_put_contents('gh-hook.log', '[OK] Attempting to pull, initiated by: '.$_SERVER['REMOTE_ADDR'].PHP_EOL, FILE_APPEND);
} else {
  file_put_contents('gh-hook.log', '[NOK] Signature failure: '.$_SERVER['REMOTE_ADDR'].PHP_EOL, FILE_APPEND);
}
?>