feature(mobile): hash assets & sync via checksum (#2592)

* compare different sha1 implementations

* remove openssl sha1

* sync via checksum

* hash assets in batches

* hash in background, show spinner in tab

* undo tmp changes

* migrate by clearing assets

* ignore duplicate assets

* error handling

* trigger sync/merge after download and update view

* review feedback improvements

* hash in background isolate on iOS

* rework linking assets with existing from DB

* fine-grained errors on unique index violation

* hash lenth validation

* revert compute in background on iOS

* ignore duplicate assets on device

* fix bug with batching based on accumulated size

---------

Co-authored-by: Fynn Petersen-Frey <zoodyy@users.noreply.github.com>

mobile/lib/modules/asset_viewer/providers/image_viewer_page_state.provider.dart

@@ -2,6 +2,7 @@ import 'package:easy_localization/easy_localization.dart';
 import 'package:flutter/material.dart';
 import 'package:fluttertoast/fluttertoast.dart';
 import 'package:hooks_riverpod/hooks_riverpod.dart';
+import 'package:immich_mobile/modules/album/services/album.service.dart';
 import 'package:immich_mobile/modules/asset_viewer/models/image_viewer_page_state.model.dart';
 import 'package:immich_mobile/modules/asset_viewer/services/image_viewer.service.dart';
 import 'package:immich_mobile/shared/models/asset.dart';
@@ -12,9 +13,13 @@ import 'package:immich_mobile/shared/ui/share_dialog.dart';
 class ImageViewerStateNotifier extends StateNotifier<ImageViewerPageState> {
   final ImageViewerService _imageViewerService;
   final ShareService _shareService;
+  final AlbumService _albumService;
 
-  ImageViewerStateNotifier(this._imageViewerService, this._shareService)
-      : super(
+  ImageViewerStateNotifier(
+    this._imageViewerService,
+    this._shareService,
+    this._albumService,
+  ) : super(
           ImageViewerPageState(
             downloadAssetStatus: DownloadAssetStatus.idle,
           ),
@@ -34,6 +39,7 @@ class ImageViewerStateNotifier extends StateNotifier<ImageViewerPageState> {
         toastType: ToastType.success,
         gravity: ToastGravity.BOTTOM,
       );
+      _albumService.refreshDeviceAlbums();
     } else {
       state = state.copyWith(downloadAssetStatus: DownloadAssetStatus.error);
       ImmichToast.show(
@@ -66,5 +72,6 @@ final imageViewerStateProvider =
   ((ref) => ImageViewerStateNotifier(
         ref.watch(imageViewerServiceProvider),
         ref.watch(shareServiceProvider),
+        ref.watch(albumServiceProvider),
       )),
 );

mobile/lib/modules/asset_viewer/ui/top_control_app_bar.dart

@@ -72,15 +72,7 @@ class TopControlAppBar extends HookConsumerWidget {
                     color: Colors.grey[200],
                   ),
           ),
-        if (!asset.isLocal)
-          IconButton(
-            onPressed: onDownloadPressed,
-            icon: Icon(
-              Icons.cloud_download_outlined,
-              color: Colors.grey[200],
-            ),
-          ),
-        if (asset.storage == AssetState.merged)
+        if (asset.storage == AssetState.remote)
           IconButton(
             onPressed: onDownloadPressed,
             icon: Icon(

mobile/lib/modules/asset_viewer/views/gallery_viewer.dart

@@ -287,7 +287,7 @@ class GalleryViewerPage extends HookConsumerWidget {
             isFavorite: asset().isFavorite,
             onMoreInfoPressed: showInfo,
             onFavorite: asset().isRemote ? () => toggleFavorite(asset()) : null,
-            onDownloadPressed: asset().storage == AssetState.local
+            onDownloadPressed: asset().isLocal
                 ? null
                 : () =>
                     ref.watch(imageViewerStateProvider.notifier).downloadAsset(

mobile/lib/modules/backup/background_service/background.service.dart

@@ -132,6 +132,17 @@ class BackgroundService {
     }
   }
 
+  Future<Uint8List?> digestFile(String path) {
+    return _foregroundChannel.invokeMethod<Uint8List>("digestFile", [path]);
+  }
+
+  Future<List<Uint8List?>?> digestFiles(List<String> paths) {
+    return _foregroundChannel.invokeListMethod<Uint8List?>(
+      "digestFiles",
+      paths,
+    );
+  }
+
   /// Updates the notification shown by the background service
   Future<bool?> _updateNotification({
     String? title,

mobile/lib/modules/home/views/home_page.dart

@@ -47,11 +47,11 @@ class HomePage extends HookConsumerWidget {
 
     useEffect(
       () {
-        ref.watch(websocketProvider.notifier).connect();
-        ref.watch(assetProvider.notifier).getAllAsset();
-        ref.watch(albumProvider.notifier).getAllAlbums();
-        ref.watch(sharedAlbumProvider.notifier).getAllSharedAlbums();
-        ref.watch(serverInfoProvider.notifier).getServerVersion();
+        ref.read(websocketProvider.notifier).connect();
+        Future(() => ref.read(assetProvider.notifier).getAllAsset());
+        ref.read(albumProvider.notifier).getAllAlbums();
+        ref.read(sharedAlbumProvider.notifier).getAllSharedAlbums();
+        ref.read(serverInfoProvider.notifier).getServerVersion();
 
         selectionEnabledHook.addListener(() {
           multiselectEnabled.state = selectionEnabledHook.value;
@@ -144,7 +144,7 @@ class HomePage extends HookConsumerWidget {
           );
           if (remoteAssets.isNotEmpty) {
             await ref
-                .watch(assetProvider.notifier)
+                .read(assetProvider.notifier)
                 .toggleArchive(remoteAssets, true);
 
             final assetOrAssets = remoteAssets.length > 1 ? 'assets' : 'asset';
@@ -163,7 +163,7 @@ class HomePage extends HookConsumerWidget {
       void onDelete() async {
         processing.value = true;
         try {
-          await ref.watch(assetProvider.notifier).deleteAssets(selection.value);
+          await ref.read(assetProvider.notifier).deleteAssets(selection.value);
           selectionEnabledHook.value = false;
         } finally {
           processing.value = false;