resolveBytes method

Future<String> resolveBytes(Uint8List bytes, { required String cacheKey, })

Writes in-memory document bytes to a temporary file and returns its path.

The native document loaders take a file URI/URL, so opening a document from a Uint8List goes through a temp file. The file is cached under cacheKey (so a widget rebuild reuses it) and removed by release / clearAll, exactly like a resolved asset.

Implementation

Future<String> resolveBytes(
  Uint8List bytes, {
  required String cacheKey,
}) async {
  if (_resolvedPaths.containsKey(cacheKey)) {
    return _resolvedPaths[cacheKey]!;
  }

  final tempDir = await getTemporaryDirectory();
  // Derive the filename from the (unique) cache key itself rather than its
  // hashCode, so two different keys can't collide onto the same temp file
  // and clobber each other's bytes. Sanitize non-filename-safe characters.
  final safeName = cacheKey.replaceAll(RegExp(r'[^A-Za-z0-9_-]'), '_');
  final tempFile = File('${tempDir.path}/nutrient_bytes_$safeName.pdf');
  await tempFile.writeAsBytes(bytes, flush: true);

  final resolvedPath = tempFile.path;
  _resolvedPaths[cacheKey] = resolvedPath;
  return resolvedPath;
}