From ec87b383e85f57c60effc6f4e5fb6195e34e83e9 Mon Sep 17 00:00:00 2001
From: M66B <M66B@users.noreply.github.com>
Date: Fri, 12 Jul 2019 19:33:40 +0200
Subject: [PATCH] Check if biometrics sensor available

---
 .../java/eu/faircode/email/ActivitySetup.java   | 15 ++++++++-------
 app/src/main/java/eu/faircode/email/Helper.java | 17 +++++++++++++++++
 2 files changed, 25 insertions(+), 7 deletions(-)

diff --git a/app/src/main/java/eu/faircode/email/ActivitySetup.java b/app/src/main/java/eu/faircode/email/ActivitySetup.java
index e0f4e30b8d..325760b115 100644
--- a/app/src/main/java/eu/faircode/email/ActivitySetup.java
+++ b/app/src/main/java/eu/faircode/email/ActivitySetup.java
@@ -201,13 +201,14 @@ public class ActivitySetup extends ActivityBase implements FragmentManager.OnBac
             }
         }));
 
-        menus.add(new NavMenuItem(R.drawable.baseline_fingerprint_24, R.string.title_setup_authentication, new Runnable() {
-            @Override
-            public void run() {
-                drawerLayout.closeDrawer(drawerContainer);
-                onMenuBiometrics();
-            }
-        }));
+        if (Helper.canAuthenticate(this))
+            menus.add(new NavMenuItem(R.drawable.baseline_fingerprint_24, R.string.title_setup_authentication, new Runnable() {
+                @Override
+                public void run() {
+                    drawerLayout.closeDrawer(drawerContainer);
+                    onMenuBiometrics();
+                }
+            }));
 
         menus.add(new NavMenuItem(R.drawable.baseline_person_24, R.string.menu_contacts, new Runnable() {
             @Override
diff --git a/app/src/main/java/eu/faircode/email/Helper.java b/app/src/main/java/eu/faircode/email/Helper.java
index ba3cb23c49..04388c59b0 100644
--- a/app/src/main/java/eu/faircode/email/Helper.java
+++ b/app/src/main/java/eu/faircode/email/Helper.java
@@ -19,6 +19,7 @@ package eu.faircode.email;
     Copyright 2018-2019 by Marcel Bokhorst (M66B)
 */
 
+import android.annotation.SuppressLint;
 import android.app.Dialog;
 import android.content.ActivityNotFoundException;
 import android.content.Context;
@@ -32,7 +33,10 @@ import android.content.res.TypedArray;
 import android.graphics.Bitmap;
 import android.graphics.BitmapFactory;
 import android.graphics.Matrix;
+import android.hardware.biometrics.BiometricManager;
+import android.hardware.fingerprint.FingerprintManager;
 import android.net.Uri;
+import android.os.Build;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.Parcel;
@@ -653,6 +657,19 @@ public class Helper {
         return Objects.equals(signed, expected);
     }
 
+    static boolean canAuthenticate(Context context) {
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M)
+            return false;
+        else if (Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.Q) {
+            FingerprintManager fpm = (FingerprintManager) context.getSystemService(Context.FINGERPRINT_SERVICE);
+            return (fpm != null && fpm.isHardwareDetected() && fpm.hasEnrolledFingerprints());
+        } else {
+            @SuppressLint("WrongConstant")
+            BiometricManager bm = (BiometricManager) context.getSystemService(Context.BIOMETRIC_SERVICE);
+            return (bm != null && bm.canAuthenticate() == BiometricManager.BIOMETRIC_SUCCESS);
+        }
+    }
+
     static boolean hasAuthentication(Context context) {
         SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
         return prefs.getBoolean("biometrics", false);