<?php
header('Content-Type: application/json');

/**
 * Check config files
 */
if (!file_exists(__DIR__ . '/../app/config/app.php')) {
    die(json_encode(['error' => 'Can not find configuration file']));
}

/**
 * Check deploy key
 */
$config = require __DIR__ . '/../app/config/app.php';
if (!isset($config['deploykey'])) {
    die(json_encode(['error' => 'Deploy key not exists']));
}

/**
 * User Agent must be a GitHub-Hookshot/****
 * @return bool
 */
$validateUserAgent = function()
{
    return isset($_SERVER['HTTP_USER_AGENT']) &&
        preg_match('/GitHub\-Hookshot\/[0-9]+/is', $_SERVER['HTTP_USER_AGENT']);
};

/**
 * Signature must be sha1 of raw content and key
 * @return bool
 */
$validateSig = function() use ($config)
{
    $input  = file_get_contents('php://input');
    $data   = json_decode($input);

    return isset($_SERVER['HTTP_X_HUB_SIGNATURE']) &&
        hash_hmac('sha1', $data, $config['deploykey']) === $_SERVER['HTTP_X_HUB_SIGNATURE'];
};

/**
 * Execute script
 * @param array $commands
 */
$exec = function(array $commands)
{
    system(implode('&&', $commands));
    die(json_encode(['success' => 'Forum updated']));
};


/**
 * Validate
 */
if ($validateUserAgent() && $validateSig()) {

    $exec([
        'cd ../',
        'git checkout -f',
        'composer update'
    ]);

}