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https://github.com/bitwarden/mobile
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accessibility service
This commit is contained in:
Kyle Spearrin
310
src/Android/Accessibility/AccessibilityService.cs
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310
src/Android/Accessibility/AccessibilityService.cs
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Threading.Tasks;
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using Android.App;
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using Android.Content;
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using Android.OS;
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using Android.Runtime;
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using Android.Views.Accessibility;
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using Bit.App.Resources;
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using Bit.Core;
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using Bit.Core.Abstractions;
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using Bit.Core.Utilities;
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namespace Bit.Droid.Accessibility
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{
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[Service(Permission = Android.Manifest.Permission.BindAccessibilityService, Label = "Bitwarden")]
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[IntentFilter(new string[] { "android.accessibilityservice.AccessibilityService" })]
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[MetaData("android.accessibilityservice", Resource = "@xml/accessibilityservice")]
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[Register("com.x8bit.bitwarden.Accessibility.AccessibilityService")]
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public class AccessibilityService : Android.AccessibilityServices.AccessibilityService
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{
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private NotificationChannel _notificationChannel;
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private const int AutoFillNotificationId = 34573;
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private const string BitwardenPackage = "com.x8bit.bitwarden";
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private const string BitwardenWebsite = "vault.bitwarden.com";
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private IStorageService _storageService;
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private bool _settingAutofillPasswordField;
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private bool _settingAutofillPersistNotification;
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private DateTime? _lastSettingsReload = null;
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private TimeSpan _settingsReloadSpan = TimeSpan.FromMinutes(1);
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private long _lastNotificationTime = 0;
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private string _lastNotificationUri = null;
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private HashSet<string> _launcherPackageNames = null;
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private DateTime? _lastLauncherSetBuilt = null;
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private TimeSpan _rebuildLauncherSpan = TimeSpan.FromHours(1);
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public override void OnAccessibilityEvent(AccessibilityEvent e)
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{
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try
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{
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var powerManager = GetSystemService(PowerService) as PowerManager;
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if(Build.VERSION.SdkInt > BuildVersionCodes.KitkatWatch && !powerManager.IsInteractive)
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{
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return;
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}
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else if(Build.VERSION.SdkInt < BuildVersionCodes.Lollipop && !powerManager.IsScreenOn)
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{
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return;
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}
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if(SkipPackage(e?.PackageName))
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{
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return;
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}
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var root = RootInActiveWindow;
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if(root == null || root.PackageName != e.PackageName)
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{
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return;
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}
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// AccessibilityHelpers.PrintTestData(root, e);
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LoadServices();
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var settingsTask = LoadSettingsAsync();
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var notificationManager = GetSystemService(NotificationService) as NotificationManager;
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var cancelNotification = true;
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switch(e.EventType)
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{
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case EventTypes.ViewFocused:
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if(e.Source == null || !e.Source.Password || !_settingAutofillPasswordField)
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{
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break;
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}
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if(e.PackageName == BitwardenPackage)
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{
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CancelNotification(notificationManager);
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break;
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}
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if(ScanAndAutofill(root, e, notificationManager, cancelNotification))
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{
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CancelNotification(notificationManager);
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}
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break;
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case EventTypes.WindowContentChanged:
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case EventTypes.WindowStateChanged:
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if(_settingAutofillPasswordField && e.Source.Password)
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{
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break;
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}
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else if(_settingAutofillPasswordField && AccessibilityHelpers.LastCredentials == null)
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{
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if(string.IsNullOrWhiteSpace(_lastNotificationUri))
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{
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CancelNotification(notificationManager);
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break;
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}
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var uri = AccessibilityHelpers.GetUri(root);
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if(uri != _lastNotificationUri)
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{
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CancelNotification(notificationManager);
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}
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else if(uri.StartsWith(Constants.AndroidAppProtocol))
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{
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CancelNotification(notificationManager, 30000);
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}
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break;
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}
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if(e.PackageName == BitwardenPackage)
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{
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CancelNotification(notificationManager);
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break;
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}
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if(_settingAutofillPersistNotification)
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{
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var uri = AccessibilityHelpers.GetUri(root);
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if(uri != null && !uri.Contains(BitwardenWebsite))
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{
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var needToFill = AccessibilityHelpers.NeedToAutofill(
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AccessibilityHelpers.LastCredentials, uri);
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if(needToFill)
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{
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var passwordNodes = AccessibilityHelpers.GetWindowNodes(root, e,
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n => n.Password, false);
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needToFill = passwordNodes.Any();
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if(needToFill)
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{
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AccessibilityHelpers.GetNodesAndFill(root, e, passwordNodes);
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}
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passwordNodes.Dispose();
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}
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if(!needToFill)
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{
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NotifyToAutofill(uri, notificationManager);
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cancelNotification = false;
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}
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}
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AccessibilityHelpers.LastCredentials = null;
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}
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else
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{
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cancelNotification = ScanAndAutofill(root, e, notificationManager, cancelNotification);
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}
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if(cancelNotification)
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{
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CancelNotification(notificationManager);
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}
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break;
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default:
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break;
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}
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notificationManager?.Dispose();
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root.Dispose();
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e.Dispose();
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}
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// Suppress exceptions so that service doesn't crash.
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catch { }
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}
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public override void OnInterrupt()
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{
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// Do nothing.
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}
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public bool ScanAndAutofill(AccessibilityNodeInfo root, AccessibilityEvent e,
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NotificationManager notificationManager, bool cancelNotification)
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{
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var passwordNodes = AccessibilityHelpers.GetWindowNodes(root, e, n => n.Password, false);
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if(passwordNodes.Count > 0)
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{
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var uri = AccessibilityHelpers.GetUri(root);
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if(uri != null && !uri.Contains(BitwardenWebsite))
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{
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if(AccessibilityHelpers.NeedToAutofill(AccessibilityHelpers.LastCredentials, uri))
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{
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AccessibilityHelpers.GetNodesAndFill(root, e, passwordNodes);
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}
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else
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{
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NotifyToAutofill(uri, notificationManager);
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cancelNotification = false;
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}
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}
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AccessibilityHelpers.LastCredentials = null;
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}
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else if(AccessibilityHelpers.LastCredentials != null)
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{
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Task.Run(async () =>
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{
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await Task.Delay(1000);
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AccessibilityHelpers.LastCredentials = null;
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});
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}
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passwordNodes.Dispose();
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return cancelNotification;
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}
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public void CancelNotification(NotificationManager notificationManager, long limit = 250)
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{
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if(Java.Lang.JavaSystem.CurrentTimeMillis() - _lastNotificationTime < limit)
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{
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return;
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}
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_lastNotificationUri = null;
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notificationManager?.Cancel(AutoFillNotificationId);
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}
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private void NotifyToAutofill(string uri, NotificationManager notificationManager)
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{
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if(notificationManager == null || string.IsNullOrWhiteSpace(uri))
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{
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return;
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}
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var now = Java.Lang.JavaSystem.CurrentTimeMillis();
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var intent = new Intent(this, typeof(AccessibilityActivity));
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intent.PutExtra("uri", uri);
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intent.SetFlags(ActivityFlags.NewTask | ActivityFlags.SingleTop | ActivityFlags.ClearTop);
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var pendingIntent = PendingIntent.GetActivity(this, 0, intent, PendingIntentFlags.UpdateCurrent);
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var notificationContent = Build.VERSION.SdkInt > BuildVersionCodes.KitkatWatch ?
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AppResources.BitwardenAutofillServiceNotificationContent :
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AppResources.BitwardenAutofillServiceNotificationContentOld;
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var builder = new Notification.Builder(this);
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builder.SetSmallIcon(Resource.Drawable.notification_sm)
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.SetContentTitle(AppResources.BitwardenAutofillService)
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.SetContentText(notificationContent)
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.SetTicker(notificationContent)
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.SetWhen(now)
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.SetContentIntent(pendingIntent);
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if(Build.VERSION.SdkInt > BuildVersionCodes.KitkatWatch)
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{
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builder.SetVisibility(NotificationVisibility.Secret)
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.SetColor(Android.Support.V4.Content.ContextCompat.GetColor(ApplicationContext,
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Resource.Color.primary));
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}
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if(Build.VERSION.SdkInt >= BuildVersionCodes.O)
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{
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if(_notificationChannel == null)
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{
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_notificationChannel = new NotificationChannel("bitwarden_autofill_service",
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AppResources.AutofillService, NotificationImportance.Low);
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notificationManager.CreateNotificationChannel(_notificationChannel);
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}
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builder.SetChannelId(_notificationChannel.Id);
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}
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if(/*Build.VERSION.SdkInt <= BuildVersionCodes.N && */_settingAutofillPersistNotification)
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{
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builder.SetPriority(-2);
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}
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_lastNotificationTime = now;
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_lastNotificationUri = uri;
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notificationManager.Notify(AutoFillNotificationId, builder.Build());
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builder.Dispose();
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}
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private bool SkipPackage(string eventPackageName)
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{
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if(string.IsNullOrWhiteSpace(eventPackageName) ||
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AccessibilityHelpers.FilteredPackageNames.Contains(eventPackageName) ||
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eventPackageName.Contains("launcher"))
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{
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return true;
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}
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if(_launcherPackageNames == null || _lastLauncherSetBuilt == null ||
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(DateTime.Now - _lastLauncherSetBuilt.Value) > _rebuildLauncherSpan)
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{
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// refresh launcher list every now and then
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_lastLauncherSetBuilt = DateTime.Now;
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var intent = new Intent(Intent.ActionMain);
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intent.AddCategory(Intent.CategoryHome);
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var resolveInfo = PackageManager.QueryIntentActivities(intent, 0);
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_launcherPackageNames = resolveInfo.Select(ri => ri.ActivityInfo.PackageName).ToHashSet();
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}
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return _launcherPackageNames.Contains(eventPackageName);
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}
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private void LoadServices()
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{
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if(_storageService == null)
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{
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_storageService = ServiceContainer.Resolve<IStorageService>("storageService");
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}
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}
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private async Task LoadSettingsAsync()
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{
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var now = DateTime.UtcNow;
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if(_lastSettingsReload == null || (now - _lastSettingsReload.Value) > _settingsReloadSpan)
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{
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_lastSettingsReload = now;
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_settingAutofillPasswordField = await _storageService.GetAsync<bool>(
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Constants.AccessibilityAutofillPasswordFieldKey);
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_settingAutofillPersistNotification = await _storageService.GetAsync<bool>(
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Constants.AccessibilityAutofillPersistNotificationKey);
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}
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}
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}
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}
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