[ Avaa Bypassed ]

<?php // phpcs:ignore SlevomatCodingStandard.TypeHints.DeclareStrictTypes.DeclareStrictTypesMissing

namespace MailPoet\Util;

if (!defined('ABSPATH')) exit;


class Helpers {
  const DIVIDER = '***MailPoet***';
  const LINK_TAG = 'link';

  public static function isJson($string) {
    if (!is_string($string)) return false;
    json_decode($string);
    return json_last_error() == JSON_ERROR_NONE;
  }

  public static function replaceLinkTags(
    string $source,
    string $link,
    array $attributes = [],
    string $linkTag = self::LINK_TAG
  ) {
    if (empty($link)) return $source;

    $attributes = array_map(function($key) use ($attributes) {
      return sprintf('%s="%s"', $key, $attributes[$key]);
    }, array_keys($attributes));
    $source = str_replace(
      '[' . $linkTag . ']',
      sprintf(
        '<a %s href="%s">',
        join(' ', $attributes),
        $link
      ),
      $source
    );
    $source = str_replace('[/' . $linkTag . ']', '</a>', $source);
    return preg_replace('/\s+/', ' ', $source);
  }

  public static function getMaxPostSize($bytes = false) {
    $maxPostSize = ini_get('post_max_size');
    if (!$bytes) return $maxPostSize;
    if ($maxPostSize === false) {
      return 0;
    }
    switch (substr($maxPostSize, -1)) {
      case 'M':
      case 'm':
        return (int)$maxPostSize * 1048576;
      case 'K':
      case 'k':
        return (int)$maxPostSize * 1024;
      case 'G':
      case 'g':
        return (int)$maxPostSize * 1073741824;
      default:
        return $maxPostSize;
    }
  }

  public static function flattenArray($array) {
    if (!$array) return;
    $flattenedArray = [];
    array_walk_recursive($array, function ($a) use (&$flattenedArray) {
      $flattenedArray[] = $a;
    });
    return $flattenedArray;
  }

  public static function underscoreToCamelCase($str, $capitaliseFirstChar = false) {
    if ($capitaliseFirstChar) {
      $str[0] = strtoupper($str[0]);
    }
    return preg_replace_callback('/_([a-z])/', function ($c) {
      return strtoupper($c[1]);
    }, $str);
  }

  public static function camelCaseToUnderscore($str) {
    $str[0] = strtolower($str[0]);
    return preg_replace_callback('/([A-Z])/', function ($c) {
      return "_" . strtolower($c[1]);
    }, $str);
  }

  public static function camelCaseToKebabCase($str) {
    $str[0] = strtolower($str[0]);
    return preg_replace_callback('/([A-Z])/', function ($c) {
      return "-" . strtolower($c[1]);
    }, $str);
  }

  public static function joinObject($object = []) {
    return implode(self::DIVIDER, $object);
  }

  public static function splitObject($object = []) {
    return explode(self::DIVIDER, $object);
  }

  public static function getIP() {
    return (isset($_SERVER['REMOTE_ADDR']))
      ? sanitize_text_field(wp_unslash($_SERVER['REMOTE_ADDR']))
      : null;
  }

  public static function recursiveTrim($value) {
    if (is_array($value))
      return array_map([__CLASS__, 'recursiveTrim'], $value);
    if (is_string($value))
      return trim($value);
    return $value;
  }

  public static function escapeSearch(string $search): string {
    return str_replace(['\\', '%', '_'], ['\\\\', '\\%', '\\_'], trim($search)); // escape for 'LIKE'
  }

  public static function extractEmailDomain(string $email = ''): string {
    $arrayOfItems = explode('@', trim($email));
    return strtolower(array_pop($arrayOfItems));
  }

  public static function mySqlGoneAwayExceptionHandler(\Throwable $err): string {
    $errorMessage = $err->getMessage() ? $err->getMessage() : '';
    $mySqlGoneAwayCheck = strpos(strtolower($errorMessage), 'mysql server has gone away') !== false;

    if ($mySqlGoneAwayCheck) {
      $customErrorMessage = sprintf(
        // translators: the %1$s is the link, the %2$s is the error message.
        __('Please see %1$s for more information. %2$s.', 'mailpoet'),
        'https://kb.mailpoet.com/article/307-how-to-fix-general-error-2006-mysql-server-has-gone-away',
        $errorMessage
      );
      // logging to the php log
      if (function_exists('error_log')) {
        error_log($customErrorMessage); // phpcs:ignore Squiz.PHP.DiscouragedFunctions
      }

      return $customErrorMessage;
    }

    return '';
  }
}