fingerprint setup

src/Android/MainApplication.cs

@@ -9,6 +9,9 @@ using Bit.Core.Abstractions;
 using Bit.Core.Services;
 using Bit.Core.Utilities;
 using Bit.Droid.Services;
+using Plugin.CurrentActivity;
+using Plugin.Fingerprint;
+using Plugin.Fingerprint.Abstractions;
 
 namespace Bit.Droid
 {
@@ -34,14 +37,16 @@ namespace Bit.Droid
         {
             base.OnCreate();
             Bootstrap();
-            Plugin.CurrentActivity.CrossCurrentActivity.Current.Init(this);
+            CrossCurrentActivity.Current.Init(this);
         }
 
         private void RegisterLocalServices()
         {
+            // CrossFingerprint.SetCurrentActivityResolver(() => CrossCurrentActivity.Current.Activity);
             Refractored.FabControl.Droid.FloatingActionButtonViewRenderer.Init();
             // Note: This might cause a race condition. Investigate more.
             Task.Run(() => FFImageLoading.Forms.Platform.CachedImageRenderer.Init(true));
+            CrossFingerprint.SetCurrentActivityResolver(() => CrossCurrentActivity.Current.Activity);
 
             var preferencesStorage = new PreferencesStorageService(null);
             var documentsPath = Environment.GetFolderPath(Environment.SpecialFolder.Personal);

src/App/App.csproj

@@ -12,6 +12,7 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <PackageReference Include="Plugin.Fingerprint" Version="1.4.9" />
     <PackageReference Include="Refractored.FloatingActionButtonForms" Version="2.1.0" />
     <PackageReference Include="Xamarin.Essentials" Version="1.1.0" />
     <PackageReference Include="Xamarin.FFImageLoading.Forms" Version="2.4.9.961" />

src/App/Pages/Settings/SettingsPageViewModel.cs

@@ -23,6 +23,8 @@ namespace Bit.App.Pages
         private readonly IStorageService _storageService;
         private readonly ISyncService _syncService;
 
+        private string _fingerprintName;
+        private bool _supportsFingerprint;
         private bool _pin;
         private bool _fingerprint;
         private string _lastSyncDate;
@@ -54,12 +56,20 @@ namespace Bit.App.Pages
 
             GroupedItems = new ExtendedObservableCollection<SettingsPageListGroup>();
             PageTitle = AppResources.Settings;
+
+            _fingerprintName = AppResources.Fingerprint;
+            if(Device.RuntimePlatform == Device.iOS)
+            {
+                _fingerprintName = AppResources.TouchID;
+                // TODO: face id
+            }
         }
 
         public ExtendedObservableCollection<SettingsPageListGroup> GroupedItems { get; set; }
 
         public async Task InitAsync()
         {
+            _supportsFingerprint = await _platformUtilsService.SupportsFingerprintAsync();
             var lastSync = await _syncService.GetLastSyncAsync();
             if(lastSync != null)
             {
@@ -243,11 +253,19 @@ namespace Bit.App.Pages
             var securityItems = new List<SettingsPageListItem>
             {
                 new SettingsPageListItem { Name = AppResources.LockOptions, SubLabel = _lockOptionValue },
-                new SettingsPageListItem { Name = string.Format(AppResources.UnlockWith, AppResources.Fingerprint) },
                 new SettingsPageListItem { Name = AppResources.UnlockWithPIN, SubLabel = _pin ? "✓" : null },
                 new SettingsPageListItem { Name = AppResources.LockNow },
                 new SettingsPageListItem { Name = AppResources.TwoStepLogin }
             };
+            if(_supportsFingerprint)
+            {
+                var item = new SettingsPageListItem
+                {
+                    Name = string.Format(AppResources.UnlockWith, _fingerprintName),
+                    SubLabel = _fingerprint ? "✓" : null
+                };
+                securityItems.Insert(1, item);
+            }
             var accountItems = new List<SettingsPageListItem>
             {
                 new SettingsPageListItem { Name = AppResources.ChangeMasterPassword },

src/App/Services/MobilePlatformUtilsService.cs

@@ -1,6 +1,9 @@
 using Bit.App.Abstractions;
 using Bit.App.Models;
+using Bit.App.Resources;
 using Bit.Core.Abstractions;
+using Plugin.Fingerprint;
+using Plugin.Fingerprint.Abstractions;
 using System;
 using System.Collections.Generic;
 using System.Threading.Tasks;
@@ -184,5 +187,45 @@ namespace Bit.App.Services
         {
             return await Clipboard.GetTextAsync();
         }
+
+        public async Task<bool> SupportsFingerprintAsync()
+        {
+            try
+            {
+                return await CrossFingerprint.Current.IsAvailableAsync();
+            }
+            catch
+            {
+                return false;
+            }
+        }
+
+        public async Task<bool> AuthenticateFingerprintAsync(string text = null, Action fallback = null)
+        {
+            try
+            {
+                if(text == null)
+                {
+                    text = AppResources.FingerprintDirection;
+                }
+                var fingerprintRequest = new AuthenticationRequestConfiguration(text)
+                {
+                    AllowAlternativeAuthentication = true,
+                    CancelTitle = AppResources.Cancel,
+                    FallbackTitle = AppResources.LogOut
+                };
+                var result = await CrossFingerprint.Current.AuthenticateAsync(fingerprintRequest);
+                if(result.Authenticated)
+                {
+                    return true;
+                }
+                else if(result.Status == FingerprintAuthenticationResultStatus.FallbackRequested)
+                {
+                    fallback?.Invoke();
+                }
+            }
+            catch { }
+            return false;
+        }
     }
 }

src/Core/Abstractions/IPlatformUtilsService.cs

@@ -1,4 +1,5 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 using System.Threading.Tasks;
 using Bit.Core.Enums;
 
@@ -25,5 +26,7 @@ namespace Bit.Core.Abstractions
         void ShowToast(string type, string title, string[] text, Dictionary<string, object> options = null);
         bool SupportsU2f();
         bool SupportsDuo();
+        Task<bool> SupportsFingerprintAsync();
+        Task<bool> AuthenticateFingerprintAsync(string text = null, Action fallback = null);
     }
 }

src/iOS/Info.plist

@@ -41,5 +41,7 @@
 		<string>FontAwesome.ttf</string>
 		<string>MaterialIcons_Regular.ttf</string>
 	</array>
+	<key>NSFaceIDUsageDescription</key>
+	<string>Use Face ID to unlock your vault.</string>
 </dict>
 </plist>