feat(mobile): efficient asset sync (#3945)

* feat(mobile): efficient asset sync

mobile/lib/utils/openapi_extensions.dart

@@ -1,59 +0,0 @@
-import 'dart:convert';
-import 'dart:io';
-
-import 'package:http/http.dart';
-import 'package:openapi/api.dart';
-
-/// Extension methods to retrieve ETag together with the API call
-extension WithETag on AssetApi {
-  /// Get all AssetEntity belong to the user
-  ///
-  /// Parameters:
-  ///
-  /// * [String] eTag:
-  ///   ETag of data already cached on the client
-  Future<(List<AssetResponseDto>? assets, String? eTag)> getAllAssetsWithETag({
-    String? eTag,
-    String? userId,
-    bool? isFavorite,
-    bool? isArchived,
-  }) async {
-    final response = await getAllAssetsWithHttpInfo(
-      ifNoneMatch: eTag,
-      userId: userId,
-      isFavorite: isFavorite,
-      isArchived: isArchived,
-    );
-    if (response.statusCode >= HttpStatus.badRequest) {
-      throw ApiException(response.statusCode, await _decodeBodyBytes(response));
-    }
-    // When a remote server returns no body with a status of 204, we shall not decode it.
-    // At the time of writing this, `dart:convert` will throw an "Unexpected end of input"
-    // FormatException when trying to decode an empty string.
-    if (response.body.isNotEmpty &&
-        response.statusCode != HttpStatus.noContent) {
-      final responseBody = await _decodeBodyBytes(response);
-      final etag = response.headers[HttpHeaders.etagHeader];
-      final data = (await apiClient.deserializeAsync(
-        responseBody,
-        'List<AssetResponseDto>',
-      ) as List)
-          .cast<AssetResponseDto>()
-          .toList();
-      return (data, etag);
-    }
-    return (null, null);
-  }
-}
-
-/// Returns the decoded body as UTF-8 if the given headers indicate an 'application/json'
-/// content type. Otherwise, returns the decoded body as decoded by dart:http package.
-Future<String> _decodeBodyBytes(Response response) async {
-  final contentType = response.headers['content-type'];
-  return contentType != null &&
-          contentType.toLowerCase().startsWith('application/json')
-      ? response.bodyBytes.isEmpty
-          ? ''
-          : utf8.decode(response.bodyBytes)
-      : response.body;
-}