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Filename : helper.php
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<?php
if (!defined('ABSPATH') && !defined('MCDATAPATH') && !defined('PHP_ERR_MONIT_PATH')) exit;

if (!class_exists('MGHelper')) :
	class MGHelper {
		public static function safePregMatch($pattern, $subject, &$matches = null, $flags = 0, $offset = 0) {
			if (!is_string($pattern) || !is_string($subject)) {
				return false;
			}
			return preg_match($pattern, $subject, $matches, $flags, $offset);
		}

		# XNOTE - The below function assumes valid input
		# $array should be an array and $keys should be an array of string, or integer data
		public static function filterArray($array, $keys) {
			$filteredArray = array();
			foreach ($keys as $key) {
				if (array_key_exists($key, $array)) {
					$filteredArray[$key] = $array[$key];
				}
			}
			return $filteredArray;
		}

		# XNOTE - The below function assumes valid input
		# $array should be an array and $keys should be an array of string, or integer data
		public static function digArray($array, $keys) {
			if (empty($keys)) {
				return null;
			}
			$curr_array = $array;
			foreach ($keys as $key) {
				if (is_array($curr_array) && array_key_exists($key, $curr_array)) {
					$curr_array = $curr_array[$key];
				} else {
					return null;
				}
			}
			return $curr_array;
		}

		public static function arrayKeyFirst($array) {
			if (!function_exists('array_key_first')) {
				foreach ($array as $key => $value) {
					return $key;
				}
				return null;
			}

			return array_key_first($array);
		}

		public static function safePregReplace($replace_regex, $replace_string, $element, $limit = -1) {
			if (!is_string($replace_regex) || !is_string($replace_string) || !is_string($element) || !is_int($limit)) {
				return $element;
			}

			$updated_element = preg_replace($replace_regex, $replace_string, $element, $limit);

			if ($updated_element === null && preg_last_error() !== PREG_NO_ERROR) {
				return $element;
			}

			return $updated_element;
		}	

		public static function safeStrReplace($search, $replace, $subject) {
			if (!is_string($search) || !is_string($replace) || !is_string($subject)) {
				return $subject;
			}
			$updated_subject = str_replace($search, $replace, $subject);
			if ($updated_subject === null) {
				return $subject;
			}
			return $updated_subject;
		}

		public static function preInitWPHook($hook_name, $function_name, $priority, $accepted_args) {
			global $wp_filter;

			// Check if $wp_filter is not initialized or not an array
			if (!isset($wp_filter) || !is_array($wp_filter)) {
				$wp_filter = array();
			}

			// Check if the hook exists in $wp_filter
			if (!isset($wp_filter[$hook_name])) {
				$wp_filter[$hook_name] = array();
			}

			// Check if the priority exists for the hook
			if (!isset($wp_filter[$hook_name][$priority])) {
				$wp_filter[$hook_name][$priority] = array();
			}

			// Add the filter function information to the $wp_filter array
			$wp_filter[$hook_name][$priority][] = array(
				'function' => $function_name,
				'accepted_args' => $accepted_args,
			);
		}

		public static function removePatternFromWpConfig($pattern) {
			if (!defined('ABSPATH')) {
				return;
			}

			$wp_conf_paths = array(
				rtrim(ABSPATH, DIRECTORY_SEPARATOR) . "/wp-config.php",
				rtrim(ABSPATH, DIRECTORY_SEPARATOR) . "../wp-config.php"
			);

			if (file_exists($wp_conf_paths[0])) {
				$fname = $wp_conf_paths[0];
			} elseif (file_exists($wp_conf_paths[1])) {
				$fname = $wp_conf_paths[1];
			} else {
				return;
			}

			self::fileRemovePattern($fname, $pattern);
		}

		public static function fileRemovePattern($fname, $pattern, $is_regex = false) {
			if (!is_string($fname) || !is_string($pattern)) {
				return;
			}

			$filesystem = self::get_direct_filesystem();

			if (!$filesystem->exists($fname)) {
				return;
			}

			$content = $filesystem->get_contents($fname);
			if ($content !== false) {
				if ($is_regex !== false) {
					$modified_content = preg_replace($pattern, "", $content);
				} else {
					$modified_content = str_replace($pattern, "", $content);
				}

				if (empty($modified_content)) {
					return;
				}

				if ($content !== $modified_content) {
					$filesystem->put_contents($fname, $modified_content, intval($filesystem->getchmod($fname), 8));
				}
			}
		}

		public static function opensslEncrypt($plain_text, $cipher_algo, $encryption_key, $iv = null) {
			if (!function_exists('openssl_encrypt') || !function_exists('openssl_get_cipher_methods') ||
					!function_exists('openssl_random_pseudo_bytes') || !function_exists('openssl_cipher_iv_length')) {
				return array(false, "OpenSSL extension not found.");
			}

			if (empty($plain_text) || !is_string($plain_text) ||
					empty($encryption_key) || !is_string($encryption_key)) {
				return array(false, "Plain text or encryption key is not a valid string.");
			}

			if (!in_array($cipher_algo, openssl_get_cipher_methods(), true)) {
				return array(false, "Invalid cipher algorithm - " . $cipher_algo);
			}

			if ($iv === null) {
				$iv_length = openssl_cipher_iv_length($cipher_algo);
				if ($iv_length === false) {
					return array(false, "IV length not found.");
				}
				$iv = openssl_random_pseudo_bytes($iv_length);
				if ($iv === false) {
					return array(false, "IV generation failed.");
				}
			}

			if (strlen($iv) !== $iv_length) {
				return array(false, "Invalid IV length. Expected length is " . $iv_length . " bytes.");
			}

			$encrypted_data = openssl_encrypt($plain_text, $cipher_algo, $encryption_key, OPENSSL_RAW_DATA, $iv);
			if ($encrypted_data === false) {
				return array(false, "Encryption failed.");
			}

			return array(true, ($iv . $encrypted_data));
		}

		public static function opensslDecrypt($data, $cipher_algo, $encryption_key) {
			if (!function_exists('openssl_decrypt') || !function_exists('openssl_get_cipher_methods') ||
					!function_exists('openssl_cipher_iv_length')) {
				return array(false, "OpenSSL extension not found.");
			}

			if (empty($data) || !is_string($data) || empty($encryption_key) || !is_string($encryption_key)) {
				return array(false, "Encrypted secret or encryption key is not a valid string.");
			}

			if (!in_array($cipher_algo, openssl_get_cipher_methods(), true)) {
				return array(false, "Invalid cipher algorithm - " . $cipher_algo);
			}

			$iv_length = openssl_cipher_iv_length($cipher_algo);
			if ($iv_length === false) {
				return array(false, "IV length not found.");
			}

			if (strlen($data) <= $iv_length) {
				return array(false, "Data length is insufficient to contain IV.");
			}

			$iv = substr($data, 0, $iv_length);
			$encrypted_data = substr($data, $iv_length);

			if ($iv === false || $encrypted_data === false) {
				return array(false, "IV or encrypted data not found.");
			}

			$decrypted_data = openssl_decrypt($encrypted_data, $cipher_algo, $encryption_key, OPENSSL_RAW_DATA, $iv);

			if ($decrypted_data === false) {
				return array(false, "Decryption failed.");
			}

			return array(true, $decrypted_data);
		}
		public static function get_direct_filesystem() {
			require_once ABSPATH . 'wp-admin/includes/class-wp-filesystem-base.php';
			require_once ABSPATH . 'wp-admin/includes/class-wp-filesystem-direct.php';
			return new WP_Filesystem_Direct(new StdClass());
		}

		public static function unslashIfWPLoaded($str) {
			if (function_exists('wp_unslash')) {
				return wp_unslash($str);
			}
			return $str;
		}
	}
endif;