faceid detection

src/Android/Services/DeviceActionService.cs

@@ -286,6 +286,11 @@ namespace Bit.Droid.Services
             }
         }
 
+        public bool SupportsFaceId()
+        {
+            return false;
+        }
+
         private bool DeleteDir(Java.IO.File dir)
         {
             if(dir != null && dir.IsDirectory)

src/App/Abstractions/IDeviceActionService.cs

@@ -17,5 +17,6 @@ namespace Bit.App.Abstractions
         Task<string> DisplayPromptAync(string title = null, string description = null, string text = null,
             string okButtonText = null, string cancelButtonText = null, bool numericKeyboard = false);
         void RateApp();
+        bool SupportsFaceId();
     }
 }

src/iOS/Services/DeviceActionService.cs

@@ -13,6 +13,7 @@ using Bit.Core.Enums;
 using Bit.iOS.Core.Views;
 using CoreGraphics;
 using Foundation;
+using LocalAuthentication;
 using MobileCoreServices;
 using Photos;
 using UIKit;
@@ -218,6 +219,20 @@ namespace Bit.iOS.Services
             Device.OpenUri(new Uri(uri));
         }
 
+        public bool SupportsFaceId()
+        {
+            if(SystemMajorVersion() < 11)
+            {
+                return false;
+            }
+            var context = new LAContext();
+            if(!context.CanEvaluatePolicy(LAPolicy.DeviceOwnerAuthenticationWithBiometrics, out NSError e))
+            {
+                return false;
+            }
+            return context.BiometryType == LABiometryType.FaceId;
+        }
+
         private void ImagePicker_FinishedPickingMedia(object sender, UIImagePickerMediaPickedEventArgs e)
         {
             if(sender is UIImagePickerController picker)