added cache folder sweep check before file actions, preventing errors

2026-08-07 21:36:09 +02:00
parent 62fa337188
commit b9cb1df473
4 changed files with 98 additions and 7 deletions
@@ -0,0 +1,40 @@
+import 'dart:async';
+import 'dart:io';
+
+import 'package:flutter/material.dart';
+
+import '../../utils/downloads/download_job.dart';
+import '../../utils/downloads/download_manager.dart';
+import '../confirm_dialog.dart';
+import '../info_dialog.dart';
+
+/// Verifies a finished download's cache file is still on disk before opening.
+///
+/// Downloads live in the app's temp dir, which Android may clear at any time
+/// (storage pressure, "Cache leeren") — while completion notifications and
+/// tray entries stay tappable indefinitely. Returns true when the file exists;
+/// otherwise drops the stale job (incl. its notification) and offers a
+/// re-download when the remote path is known (it isn't for notification taps
+/// whose task metadata got lost).
+bool ensureDownloadStillExists(BuildContext context, DownloadJob job) {
+  final path = job.localPath;
+  if (path == null || File(path).existsSync()) return true;
+
+  DownloadManager.instance.markOpened(job);
+  if (job.remotePath.isNotEmpty) {
+    ConfirmDialog(
+      title: 'Datei nicht mehr verfügbar',
+      content:
+          'Die heruntergeladene Datei wurde vom System aus dem Zwischenspeicher entfernt.\nErneut herunterladen?',
+      confirmButton: 'Herunterladen',
+      onConfirm: () => unawaited(DownloadManager.instance.retry(job)),
+    ).asDialog(context);
+  } else {
+    InfoDialog.show(
+      context,
+      'Die heruntergeladene Datei wurde vom System aus dem Zwischenspeicher entfernt. Bitte lade sie erneut herunter.',
+      title: 'Datei nicht mehr verfügbar',
+    );
+  }
+  return false;
+}