add connectivity check into saber sync interface

Issue: #541

Author: AlphaGergedan

lib/components/home/syncing_button.dart

@@ -2,6 +2,7 @@ import 'dart:async';
 
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
+import 'package:saber/components/notifs/snackbar.dart';
 import 'package:saber/components/theming/adaptive_icon.dart';
 import 'package:saber/data/nextcloud/saber_syncer.dart';
 import 'package:saber/data/prefs.dart';
@@ -46,6 +47,11 @@ class _SyncingButtonState extends State<SyncingButton> {
     if (mounted) setState(() {});
   }
 
+  void _snackBarSyncOnlyOverWifi() {
+    if (!mounted) return;
+    SnackBarNotification.show(context, message: 'Wifi is not connected, disable "sync only over wifi" in settings to use mobile data.'); // fixme
+  }
+
   /// Returns a value between 0-1 representing the progress of the sync,
   /// or null if we're still refreshing.
   double? getPercentage() {
@@ -60,9 +66,14 @@ class _SyncingButtonState extends State<SyncingButton> {
     return filesTransferred / (filesTransferred + numPending);
   }
 
-  void onPressed() {
+  void onPressed() async {
     assert(Prefs.loggedIn);
 
+    if (!(await SaberSyncInterface.shouldSync())) {
+      _snackBarSyncOnlyOverWifi();
+      return;
+    }
+
     // Don't refresh if we're already refreshing.
     if (syncer.downloader.isRefreshing) return;
 

lib/components/settings/nextcloud_profile.dart

@@ -4,6 +4,7 @@ import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
 import 'package:go_router/go_router.dart';
 import 'package:nextcloud/provisioning_api.dart';
+import 'package:saber/components/notifs/snackbar.dart';
 import 'package:saber/components/theming/adaptive_icon.dart';
 import 'package:saber/data/file_manager/file_manager.dart';
 import 'package:saber/data/nextcloud/nextcloud_client_extension.dart';
@@ -52,6 +53,19 @@ class _NextcloudProfileState extends State<NextcloudProfile> {
     if (mounted) setState(() {});
   }
 
+  void _resyncEverything() async {
+    Prefs.fileSyncResyncEverythingDate.value = DateTime.now();
+    final allFiles = await FileManager.getAllFiles(includeExtensions: true, includeAssets: true);
+    for (final file in allFiles) {
+      syncer.uploader.enqueueRel(file);
+    }
+  }
+
+  void _snackBarSyncOnlyOverWifi() {
+    if (!mounted) return;
+    SnackBarNotification.show(context, message: 'Wifi is not connected, disable "sync only over wifi" in settings to use mobile data.'); // fixme
+  }
+
   @override
   Widget build(BuildContext context) {
     final loginStep =
@@ -71,6 +85,7 @@ class _NextcloudProfileState extends State<NextcloudProfile> {
     };
 
     var colorScheme = Theme.of(context).colorScheme;
+
     return ListTile(
       onTap: () => context.push(RoutePaths.login),
       leading: ValueListenableBuilder(
@@ -140,12 +155,11 @@ class _NextcloudProfileState extends State<NextcloudProfile> {
                   ),
                   tooltip: t.settings.resyncEverything,
                   onPressed: () async {
-                    Prefs.fileSyncResyncEverythingDate.value = DateTime.now();
-                    final allFiles = await FileManager.getAllFiles(
-                        includeExtensions: true, includeAssets: true);
-                    for (final file in allFiles) {
-                      syncer.uploader.enqueueRel(file);
+                    if (!(await SaberSyncInterface.shouldSync())) {
+                      _snackBarSyncOnlyOverWifi();
+                      return;
                     }
+                    _resyncEverything();
                   },
                 ),
               ],

lib/data/nextcloud/saber_syncer.dart

@@ -2,6 +2,7 @@ import 'dart:convert';
 import 'dart:io';
 
 import 'package:abstract_sync/abstract_sync.dart';
+import 'package:connectivity_plus/connectivity_plus.dart';
 import 'package:encrypt/encrypt.dart';
 import 'package:flutter/foundation.dart';
 import 'package:http/http.dart';
@@ -23,6 +24,16 @@ class SaberSyncInterface
     extends AbstractSyncInterface<SaberSyncFile, File, WebDavFile> {
   const SaberSyncInterface();
 
+  static Future<bool> shouldSync() async {
+    if (Prefs.onlySyncOverWifi.value) {
+      final List<ConnectivityResult> connRes = await Connectivity().checkConnectivity();
+      if (!connRes.contains(ConnectivityResult.wifi)) {
+        return false;
+      }
+    }
+    return true;
+  }
+
   static final log = Logger('SaberSyncInterface');
 
   @override

lib/main_common.dart

@@ -161,7 +161,10 @@ void setupBackgroundSync() {
 }
 
 @pragma('vm:entry-point')
-void doBackgroundSync() {
+void doBackgroundSync() async {
+  if (!(await SaberSyncInterface.shouldSync())) {
+    return; // FIXME: should we warn user in this case?
+  }
   Workmanager().executeTask((_, __) async {
     StrokeOptionsExtension.setDefaults();
     Prefs.init();