[mob][locker] Support saving file offline

mobile/apps/locker/lib/l10n/app_en.arb

@@ -29,6 +29,53 @@
       }
     }
   },
+  "saveOffline": "Save offline",
+  "unsave": "Unsave",
+  "savingOffline": "Saving offline...",
+  "filesAvailableOffline": "{count, plural, =1{1 file saved offline} other{{count} files saved offline}}",
+  "@filesAvailableOffline": {
+    "description": "Success message when files are saved offline",
+    "placeholders": {
+      "count": {
+        "type": "int",
+        "example": "3"
+      }
+    }
+  },
+  "filesAvailableOfflinePartial": "{successCount, plural, =1{Saved 1 file offline} other{Saved {successCount} files offline}}, {failureCount, plural, =1{1 failed} other{{failureCount} failed}}",
+  "@filesAvailableOfflinePartial": {
+    "description": "Partial success message for offline save",
+    "placeholders": {
+      "successCount": {
+        "type": "int",
+        "example": "2"
+      },
+      "failureCount": {
+        "type": "int",
+        "example": "1"
+      }
+    }
+  },
+  "failedToSaveFilesOffline": "{count, plural, =1{Failed to save 1 file offline} other{Failed to save {count} files offline}}",
+  "@failedToSaveFilesOffline": {
+    "description": "Failure message when files could not be saved offline",
+    "placeholders": {
+      "count": {
+        "type": "int",
+        "example": "2"
+      }
+    }
+  },
+  "filesRemovedFromOffline": "{count, plural, =1{1 file removed from offline} other{{count} files removed from offline}}",
+  "@filesRemovedFromOffline": {
+    "description": "Success message when offline copies are removed",
+    "placeholders": {
+      "count": {
+        "type": "int",
+        "example": "2"
+      }
+    }
+  },
   "downloadFailed": "Download failed",
   "failedToDownloadOrDecrypt": "Failed to download item",
   "errorOpeningFile": "Error opening item",

mobile/apps/locker/lib/l10n/app_localizations.dart

@@ -270,6 +270,48 @@ abstract class AppLocalizations {
   /// **'Downloading... {percentage}%'**
   String downloadingProgress(int percentage);
 
+  /// No description provided for @saveOffline.
+  ///
+  /// In en, this message translates to:
+  /// **'Save offline'**
+  String get saveOffline;
+
+  /// No description provided for @unsave.
+  ///
+  /// In en, this message translates to:
+  /// **'Unsave'**
+  String get unsave;
+
+  /// No description provided for @savingOffline.
+  ///
+  /// In en, this message translates to:
+  /// **'Saving offline...'**
+  String get savingOffline;
+
+  /// Success message when files are saved offline
+  ///
+  /// In en, this message translates to:
+  /// **'{count, plural, =1{1 file saved offline} other{{count} files saved offline}}'**
+  String filesAvailableOffline(int count);
+
+  /// Partial success message for offline save
+  ///
+  /// In en, this message translates to:
+  /// **'{successCount, plural, =1{Saved 1 file offline} other{Saved {successCount} files offline}}, {failureCount, plural, =1{1 failed} other{{failureCount} failed}}'**
+  String filesAvailableOfflinePartial(int successCount, int failureCount);
+
+  /// Failure message when files could not be saved offline
+  ///
+  /// In en, this message translates to:
+  /// **'{count, plural, =1{Failed to save 1 file offline} other{Failed to save {count} files offline}}'**
+  String failedToSaveFilesOffline(int count);
+
+  /// Success message when offline copies are removed
+  ///
+  /// In en, this message translates to:
+  /// **'{count, plural, =1{1 file removed from offline} other{{count} files removed from offline}}'**
+  String filesRemovedFromOffline(int count);
+
   /// No description provided for @downloadFailed.
   ///
   /// In en, this message translates to:

mobile/apps/locker/lib/l10n/app_localizations_en.dart

@@ -75,6 +75,65 @@ class AppLocalizationsEn extends AppLocalizations {
     return 'Downloading... $percentage%';
   }
 
+  @override
+  String get saveOffline => 'Save offline';
+
+  @override
+  String get unsave => 'Unsave';
+
+  @override
+  String get savingOffline => 'Saving offline...';
+
+  @override
+  String filesAvailableOffline(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: '$count files saved offline',
+      one: '1 file saved offline',
+    );
+    return '$_temp0';
+  }
+
+  @override
+  String filesAvailableOfflinePartial(int successCount, int failureCount) {
+    String _temp0 = intl.Intl.pluralLogic(
+      successCount,
+      locale: localeName,
+      other: 'Saved $successCount files offline',
+      one: 'Saved 1 file offline',
+    );
+    String _temp1 = intl.Intl.pluralLogic(
+      failureCount,
+      locale: localeName,
+      other: '$failureCount failed',
+      one: '1 failed',
+    );
+    return '$_temp0, $_temp1';
+  }
+
+  @override
+  String failedToSaveFilesOffline(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: 'Failed to save $count files offline',
+      one: 'Failed to save 1 file offline',
+    );
+    return '$_temp0';
+  }
+
+  @override
+  String filesRemovedFromOffline(int count) {
+    String _temp0 = intl.Intl.pluralLogic(
+      count,
+      locale: localeName,
+      other: '$count files removed from offline',
+      one: '1 file removed from offline',
+    );
+    return '$_temp0';
+  }
+
   @override
   String get downloadFailed => 'Download failed';
 

mobile/apps/locker/lib/main.dart

@@ -25,13 +25,14 @@ import 'package:locker/l10n/app_localizations.dart';
 import 'package:locker/services/collections/collections_api_client.dart';
 import 'package:locker/services/collections/collections_service.dart';
 import 'package:locker/services/configuration.dart';
-import "package:locker/services/db/locker_db.dart";
+import 'package:locker/services/db/locker_db.dart';
 import 'package:locker/services/favorites_service.dart';
 import 'package:locker/services/files/download/service_locator.dart';
-import "package:locker/services/files/links/links_client.dart";
-import "package:locker/services/files/links/links_service.dart";
+import 'package:locker/services/files/links/links_client.dart';
+import 'package:locker/services/files/links/links_service.dart';
+import 'package:locker/services/files/offline/offline_files_service.dart';
 import 'package:locker/services/trash/trash_service.dart';
-import "package:locker/services/update_service.dart";
+import 'package:locker/services/update_service.dart';
 import 'package:locker/ui/pages/home_page.dart';
 import 'package:package_info_plus/package_info_plus.dart';
 import 'package:path_provider/path_provider.dart';
@@ -179,6 +180,7 @@ Future<void> _init(bool bool, {String? via}) async {
     await CollectionApiClient.instance.init();
     await CollectionService.instance.init(preferences);
     await FavoritesService.instance.init();
+    await OfflineFilesService.instance.init();
     await LinksClient.instance.init();
     await LinksService.instance.init();
     await ServiceLocator.instance.init(

mobile/apps/locker/lib/services/collections/collections_service.dart

@@ -21,6 +21,7 @@ import "package:locker/services/collections/models/files_split.dart";
 import "package:locker/services/collections/models/public_url.dart";
 import 'package:locker/services/configuration.dart';
 import "package:locker/services/db/locker_db.dart";
+import 'package:locker/services/files/offline/offline_files_service.dart';
 import 'package:locker/services/files/sync/models/file.dart';
 import 'package:locker/services/trash/models/trash_item_request.dart';
 import "package:locker/services/trash/trash_service.dart";
@@ -133,6 +134,7 @@ class CollectionService {
       );
     }
     await Future.wait(fileFutures);
+    await OfflineFilesService.instance.cleanupInactiveOfflineFiles();
     if (updatedCollections.isNotEmpty) {
       Bus.instance.fire(CollectionsUpdatedEvent('sync'));
     }
@@ -436,11 +438,6 @@ class CollectionService {
     try {
       await _apiClient.removeFromCollection(collectionId, files);
 
-      final collection = await getCollectionByID(collectionId);
-      if (collection != null) {
-        await _db.deleteFilesFromCollection(collection, files);
-      }
-
       Bus.instance.fire(CollectionsUpdatedEvent('files_removed'));
 
       await sync();
@@ -469,17 +466,15 @@ class CollectionService {
       // Call API to move files on server
       await _apiClient.move(files, from, to);
 
-      // Update local database for all files
-      // Remove from source collection
-      await _db.deleteFilesFromCollection(from, files);
-
       // Update collectionID for all files
       for (final file in files) {
         file.collectionID = to.id;
       }
 
-      // Add to target collection
+      // Write the destination row first so local key material and offline state
+      // stay attached to the moved file before the source mapping is removed.
       await _db.addFilesToCollection(to, files);
+      await _db.deleteFilesFromCollection(from, files);
 
       // Let sync update the local state to ensure consistency
       if (runSync) {
@@ -729,9 +724,10 @@ class CollectionService {
     }
     final Collection? targetCollection =
         await getCollectionByID(toCollectionID);
-    // ignore non-cached collections, uncategorized and favorite
-    // collections and collections ignored by others
+    // ignore non-cached, deleted, uncategorized and favorite collections,
+    // and collections ignored by others
     if (targetCollection == null ||
+        targetCollection.isDeleted ||
         (CollectionType.uncategorized == targetCollection.type ||
             targetCollection.type == CollectionType.favorites) ||
         targetCollection.owner.id != userID) {

mobile/apps/locker/lib/services/collections/models/collection_view_type.dart

@@ -28,6 +28,8 @@ extension CollectionViewTypeActions on CollectionViewType {
 
   bool get showAddToCollectionOption => !isIncomingShare;
 
+  bool get showOfflineOption => !isIncomingShare;
+
   bool get showMarkImportantOption => !isIncomingShare;
 }
 

mobile/apps/locker/lib/services/configuration.dart

@@ -1,14 +1,11 @@
-import 'dart:io';
-
 import 'package:ente_configuration/base_configuration.dart';
 import 'package:locker/services/collections/collections_service.dart';
 import 'package:locker/services/favorites_service.dart';
-import 'package:logging/logging.dart';
+import 'package:locker/services/files/offline/offline_file_storage.dart';
 
 class Configuration extends BaseConfiguration {
   Configuration._privateConstructor();
   static final Configuration instance = Configuration._privateConstructor();
-  static final _logger = Logger("Configuration");
 
   @override
   // Provide all secure storage keys that should be wiped on logout.
@@ -24,18 +21,6 @@ class Configuration extends BaseConfiguration {
     FavoritesService.instance.clearCache();
 
     await super.logout(autoLogout: autoLogout);
-    await _clearCachedFiles();
-  }
-
-  Future<void> _clearCachedFiles() async {
-    try {
-      final cacheDir = Directory(getCacheDirectory());
-      if (!await cacheDir.exists()) return;
-      await for (final entity in cacheDir.list(followLinks: false)) {
-        await entity.delete(recursive: true);
-      }
-    } catch (e, s) {
-      _logger.warning("Failed to clear cached files on logout", e, s);
-    }
+    await clearAllOfflineFileCopies();
   }
 }