pattern = $pattern; $this->disableEntityLoaderCheck(); // A fatal error will bypass the destructor, so we register a shutdown here if (!self::$shutdownRegistered) { self::$shutdownRegistered = true; register_shutdown_function([__CLASS__, 'shutdown']); } } public static function getInstance(Reader\IReader $reader) { switch (true) { case $reader instanceof Reader\Html: return new self('= 1; case 1: return PHP_RELEASE_VERSION >= 13; case 0: return PHP_RELEASE_VERSION >= 27; } return true; } return false; } private function disableEntityLoaderCheck(): void { if (\PHP_VERSION_ID < 80000) { $libxmlDisableEntityLoaderValue = libxml_disable_entity_loader(true); if (self::$libxmlDisableEntityLoaderValue === null) { self::$libxmlDisableEntityLoaderValue = $libxmlDisableEntityLoaderValue; } } } public static function shutdown(): void { if (self::$libxmlDisableEntityLoaderValue !== null && \PHP_VERSION_ID < 80000) { libxml_disable_entity_loader(self::$libxmlDisableEntityLoaderValue); self::$libxmlDisableEntityLoaderValue = null; } } public function __destruct() { self::shutdown(); } public function setAdditionalCallback(callable $callback): void { $this->callback = $callback; } private function toUtf8($xml) { $pattern = '/encoding="(.*?)"/'; $result = preg_match($pattern, $xml, $matches); $charset = strtoupper($result ? $matches[1] : 'UTF-8'); if ($charset !== 'UTF-8') { $xml = mb_convert_encoding($xml, 'UTF-8', $charset); $result = preg_match($pattern, $xml, $matches); $charset = strtoupper($result ? $matches[1] : 'UTF-8'); if ($charset !== 'UTF-8') { throw new Reader\Exception('Suspicious Double-encoded XML, spreadsheet file load() aborted to prevent XXE/XEE attacks'); } } return $xml; } /** * Scan the XML for use of disableEntityLoaderCheck(); $xml = $this->toUtf8($xml); // Don't rely purely on libxml_disable_entity_loader() $pattern = '/\\0?' . implode('\\0?', str_split($this->pattern)) . '\\0?/'; if (preg_match($pattern, $xml)) { throw new Reader\Exception('Detected use of ENTITY in XML, spreadsheet file load() aborted to prevent XXE/XEE attacks'); } if ($this->callback !== null && is_callable($this->callback)) { $xml = call_user_func($this->callback, $xml); } return $xml; } /** * Scan theXML for use of scan(file_get_contents($filestream)); } }