[local-authentication] added supported authentication type estimate with package manager

docs/pages/versions/unversioned/sdk/local-authentication.md

@@ -7,7 +7,7 @@ import InstallSection from '~/components/plugins/InstallSection';
 import PlatformsSection from '~/components/plugins/PlatformsSection';
 import TableOfContentSection from '~/components/plugins/TableOfContentSection';
 
-**`expo-local-authentication`** allows you to use FaceID and TouchID (iOS) or the Fingerprint API (Android) to authenticate the user with a face or fingerprint scan.
+**`expo-local-authentication`** allows you to use FaceID and TouchID (iOS) or the Biometric Prompt (Android) to authenticate the user with a face or fingerprint scan.
 
 <PlatformsSection android emulator ios simulator web={{ pending: 'https://github.com/expo/expo/issues/4045' }} />
 
@@ -58,10 +58,10 @@ Attempts to authenticate via Fingerprint/TouchID (or FaceID if available on the
 #### Arguments
 
 - **options (_object_)** -- An object of options.
-  - **promptMessage (_string_)** -- A message that is shown alongside the TouchID or FaceID prompt. (**iOS only**)
-  - **cancelLabel (_string_)** -- Allows to customize the default `Cancel` label shown. (**iOS only**)
+  - **promptMessage (_string_)** -- A message that is shown alongside the TouchID or FaceID prompt.
+  - **cancelLabel (_string_)** -- Allows to customize the default `Cancel` label shown.
   - **fallbackLabel (_string_)** -- Allows to customize the default `Use Passcode` label shown after several failed authentication attempts. Setting this option to an empty string disables this button from showing in the prompt. (**iOS only**)
-  - **disableDeviceFallback (_boolean_)** -- After several failed attempts the system will fallback to the device passcode. This setting allows you to disable this option and instead handle the fallback yourself. This can be preferable in certain custom authentication workflows. This behaviour maps to using the iOS [LAPolicyDeviceOwnerAuthenticationWithBiometrics](https://developer.apple.com/documentation/localauthentication/lapolicy/lapolicydeviceownerauthenticationwithbiometrics?language=objc) policy rather than the [LAPolicyDeviceOwnerAuthentication](https://developer.apple.com/documentation/localauthentication/lapolicy/lapolicydeviceownerauthentication?language=objc) policy. Defaults to `false`. (**iOS only**)
+  - **disableDeviceFallback (_boolean_)** -- After several failed attempts the system will fallback to the device passcode. This setting allows you to disable this option and instead handle the fallback yourself. This can be preferable in certain custom authentication workflows. This behaviour maps to using the iOS [LAPolicyDeviceOwnerAuthenticationWithBiometrics](https://developer.apple.com/documentation/localauthentication/lapolicy/lapolicydeviceownerauthenticationwithbiometrics?language=objc) policy rather than the [LAPolicyDeviceOwnerAuthentication](https://developer.apple.com/documentation/localauthentication/lapolicy/lapolicydeviceownerauthentication?language=objc) policy. Defaults to `false`.
 
 #### Returns
 

packages/expo-local-authentication/CHANGELOG.md

@@ -9,3 +9,5 @@
 - Added support for `promptMessage`, `cancelLabel` and `disableDeviceFallback` on Android. ([#8219](https://github.com/expo/expo/pull/8219) by [@diegolmello](https://github.com/diegolmello))
 
 ### 🐛 Bug fixes
+
+- Added estimate of supported authentication types for Android. ([#8431](https://github.com/expo/expo/pull/8431) by [@bycedric](https://github.com/bycedric))

packages/expo-local-authentication/android/src/main/java/expo/modules/localauthentication/LocalAuthenticationModule.java

@@ -5,6 +5,7 @@
 import android.app.Activity;
 import android.app.KeyguardManager;
 import android.content.Context;
+import android.content.pm.PackageManager;
 import android.os.Build;
 import android.os.Bundle;
 import androidx.core.os.CancellationSignal;
@@ -28,13 +29,15 @@
 
 public class LocalAuthenticationModule extends ExportedModule {
   private final BiometricManager mBiometricManager;
+  private final PackageManager mPackageManager;
   private CancellationSignal mCancellationSignal;
   private Promise mPromise;
   private boolean mIsAuthenticating = false;
   private ModuleRegistry mModuleRegistry;
   private UIManager mUIManager;
 
   private static final int AUTHENTICATION_TYPE_FINGERPRINT = 1;
+  private static final int AUTHENTICATION_TYPE_FACIAL_RECOGNITION = 2;
 
   private final BiometricPrompt.AuthenticationCallback mAuthenticationCallback =
           new BiometricPrompt.AuthenticationCallback () {
@@ -61,6 +64,7 @@ public LocalAuthenticationModule(Context context) {
     super(context);
 
     mBiometricManager = BiometricManager.from(context);
+    mPackageManager = context.getPackageManager();
   }
 
   @Override
@@ -78,9 +82,16 @@ public void onCreate(ModuleRegistry moduleRegistry) {
   public void supportedAuthenticationTypesAsync(final Promise promise) {
     int result = mBiometricManager.canAuthenticate();
     List<Integer> results = new ArrayList<>();
-    if (result != BiometricManager.BIOMETRIC_ERROR_NO_HARDWARE) {
+    if (result == BiometricManager.BIOMETRIC_ERROR_NO_HARDWARE) {
+      promise.resolve(results);
+      return;
+    }
+    if (mPackageManager.hasSystemFeature(PackageManager.FEATURE_FINGERPRINT)) {
       results.add(AUTHENTICATION_TYPE_FINGERPRINT);
     }
+    if (mPackageManager.hasSystemFeature(PackageManager.FEATURE_FACE)) {
+      results.add(AUTHENTICATION_TYPE_FACIAL_RECOGNITION);
+    }
     promise.resolve(results);
   }