mirror of https://github.com/immich-app/immich.git
feat(mobile): use cached asset info if unchanged instead of downloading all assets (#1017)
* feat(mobile): use cached asset info if unchanged instead of downloading all assets This adds an HTTP ETag to the getAllAssets endpoint and client-side support in the app. If locally cache content is identical to the content on the server, the potentially large list of all assets does not need to be downloaded. * use ts import instead of requirepull/1023/head
Fynn Petersen-Frey
GitHub
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import 'dart:convert';
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import 'dart:io';
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import 'package:http/http.dart';
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import 'package:openapi/api.dart';
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import 'tuple.dart';
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/// Extension methods to retrieve ETag together with the API call
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extension WithETag on AssetApi {
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/// Get all AssetEntity belong to the user
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///
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/// Parameters:
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///
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/// * [String] eTag:
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/// ETag of data already cached on the client
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Future<Pair<List<AssetResponseDto>, String?>?> getAllAssetsWithETag({
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String? eTag,
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}) async {
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final response = await getAllAssetsWithHttpInfo(
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ifNoneMatch: eTag,
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);
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if (response.statusCode >= HttpStatus.badRequest) {
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throw ApiException(response.statusCode, await _decodeBodyBytes(response));
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}
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// When a remote server returns no body with a status of 204, we shall not decode it.
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// At the time of writing this, `dart:convert` will throw an "Unexpected end of input"
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// FormatException when trying to decode an empty string.
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if (response.body.isNotEmpty &&
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response.statusCode != HttpStatus.noContent) {
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final responseBody = await _decodeBodyBytes(response);
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final etag = response.headers[HttpHeaders.etagHeader];
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final data = (await apiClient.deserializeAsync(
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responseBody, 'List<AssetResponseDto>') as List)
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.cast<AssetResponseDto>()
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.toList();
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return Pair(data, etag);
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}
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return null;
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}
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}
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/// Returns the decoded body as UTF-8 if the given headers indicate an 'application/json'
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/// content type. Otherwise, returns the decoded body as decoded by dart:http package.
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Future<String> _decodeBodyBytes(Response response) async {
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final contentType = response.headers['content-type'];
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return contentType != null &&
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contentType.toLowerCase().startsWith('application/json')
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? response.bodyBytes.isEmpty
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? ''
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: utf8.decode(response.bodyBytes)
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: response.body;
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}
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/// An immutable pair or 2-tuple
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/// TODO replace with Record once Dart 2.19 is available
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class Pair<T1, T2> {
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final T1 first;
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final T2 second;
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const Pair(this.first, this.second);
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}
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declare module 'crypto' {
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namespace webcrypto {
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const subtle: SubtleCrypto;
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}
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}
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import { webcrypto } from 'node:crypto';
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const { subtle } = webcrypto;
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export async function etag(text: string): Promise<string> {
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const encoder = new TextEncoder();
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const data = encoder.encode(text);
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const buffer = await subtle.digest('SHA-1', data);
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const hash = Buffer.from(buffer).toString('base64').slice(0, 27);
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return `"${data.length}-${hash}"`;
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}
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