isPdfProtected method

@override Future<bool> isPdfProtected({ required String filePath, File? webFile, })

Implementation

@override
Future<bool> isPdfProtected({
  required String filePath, // filePath is less relevant on web
  html.File? webFile, // This should be passed from file_picker on web
}) async {
  if (webFile == null) {
    throw PlatformException(
      code: "MISSING_FILE_WEB",
      message: "Web file data not provided for isPdfProtected.",
    );
  }
  print('[Web] isPdfProtected called for ${webFile.name}');

  final completer = Completer<bool>();
  final reader = html.FileReader();
  reader.readAsArrayBuffer(webFile);

  reader.onLoadEnd.listen((event) async {
    if (reader.readyState == html.FileReader.DONE) {
      final Uint8List fileBytes = reader.result as Uint8List;
      print(
        '[Web] isPdfProtected: File read, ${fileBytes.lengthInBytes} bytes.',
      );
      try {
        // Call a JavaScript function that uses PDF.js to check protection
        final jsPromise = js_util.callMethod(
          html.window,
          '_webIsPdfProtected',
          [fileBytes],
        );
        final bool isProtected = await js_util.promiseToFuture(
          jsPromise as Object,
        );
        print('[Web] isPdfProtected: Result from JS: $isProtected');
        completer.complete(isProtected);
      } catch (e) {
        print('[Web] isPdfProtected: Error during JS call: ${e.toString()}');
        completer.completeError(
          PlatformException(
            code: 'WEB_JS_CALL_ERROR_CHECK',
            message:
                'Error calling PDF.js interop for isPdfProtected: ${e.toString()}',
          ),
        );
      }
    } else {
      print('[Web] isPdfProtected: FileReader not DONE.');
      completer.completeError(
        PlatformException(
          code: 'WEB_FILE_READ_INCOMPLETE_CHECK',
          message: 'Web file reading was not completed for isPdfProtected.',
        ),
      );
    }
  });
  reader.onError.listen((event) {
    print('[Web] isPdfProtected: FileReader error.');
    completer.completeError(
      PlatformException(
        code: 'WEB_FILE_READ_ERROR_CHECK',
        message: 'Error reading web file for isPdfProtected.',
      ),
    );
  });
  return completer.future;
}