Added setting to disable safe browsing

Closes #175

app/src/main/AndroidManifest.xml

@@ -55,7 +55,7 @@
             android:value="true" />
         <meta-data
             android:name="android.webkit.WebView.EnableSafeBrowsing"
-            android:value="false" />
+            android:value="true" />
         <meta-data
             android:name="android.allow_multiple_resumed_activities"
             android:value="true" />

app/src/main/java/eu/faircode/email/FragmentOptionsPrivacy.java

@@ -24,6 +24,7 @@ import android.content.DialogInterface;
 import android.content.Intent;
 import android.content.SharedPreferences;
 import android.content.pm.PackageManager;
+import android.os.Build;
 import android.os.Bundle;
 import android.os.Handler;
 import android.text.TextUtils;
@@ -61,11 +62,12 @@ public class FragmentOptionsPrivacy extends FragmentBase implements SharedPrefer
     private Button btnBiometrics;
     private Button btnPin;
     private Spinner spBiometricsTimeout;
+    private SwitchCompat swSafeBrowsing;
 
     private final static String[] RESET_OPTIONS = new String[]{
             "confirm_links", "confirm_images", "confirm_html",
             "disable_tracking", "display_hidden", "secure",
-            "biometrics", "pin", "biometrics_timeout"
+            "biometrics", "pin", "biometrics_timeout", "safe_browsing"
     };
 
     @Override
@@ -88,6 +90,7 @@ public class FragmentOptionsPrivacy extends FragmentBase implements SharedPrefer
         btnBiometrics = view.findViewById(R.id.btnBiometrics);
         btnPin = view.findViewById(R.id.btnPin);
         spBiometricsTimeout = view.findViewById(R.id.spBiometricsTimeout);
+        swSafeBrowsing = view.findViewById(R.id.swSafeBrowsing);
 
         setOptions();
 
@@ -189,6 +192,14 @@ public class FragmentOptionsPrivacy extends FragmentBase implements SharedPrefer
             }
         });
 
+        swSafeBrowsing.setVisibility(Build.VERSION.SDK_INT < Build.VERSION_CODES.O ? View.GONE : View.VISIBLE);
+        swSafeBrowsing.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
+            @Override
+            public void onCheckedChanged(CompoundButton compoundButton, boolean checked) {
+                prefs.edit().putBoolean("safe_browsing", checked).apply();
+            }
+        });
+
         PreferenceManager.getDefaultSharedPreferences(getContext()).registerOnSharedPreferenceChangeListener(this);
 
         return view;
@@ -255,6 +266,8 @@ public class FragmentOptionsPrivacy extends FragmentBase implements SharedPrefer
                 spBiometricsTimeout.setSelection(pos);
                 break;
             }
+
+        swSafeBrowsing.setChecked(prefs.getBoolean("safe_browsing", true));
     }
 
     public static class FragmentDialogPin extends FragmentDialogBase {

app/src/main/java/eu/faircode/email/WebViewEx.java

@@ -20,6 +20,7 @@ package eu.faircode.email;
 */
 
 import android.content.Context;
+import android.content.SharedPreferences;
 import android.net.Uri;
 import android.os.Build;
 import android.util.Pair;
@@ -29,6 +30,8 @@ import android.webkit.WebSettings;
 import android.webkit.WebView;
 import android.webkit.WebViewClient;
 
+import androidx.preference.PreferenceManager;
+
 public class WebViewEx extends WebView implements DownloadListener, View.OnLongClickListener {
     private int height;
     private IWebView intf;
@@ -53,6 +56,12 @@ public class WebViewEx extends WebView implements DownloadListener, View.OnLongC
 
         settings.setAllowFileAccess(false);
         settings.setMixedContentMode(WebSettings.MIXED_CONTENT_ALWAYS_ALLOW);
+
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+            SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
+            boolean safe_browsing = prefs.getBoolean("safe_browsing", true);
+            settings.setSafeBrowsingEnabled(safe_browsing);
+        }
     }
 
     void init(

app/src/main/res/layout/fragment_options_privacy.xml

@@ -231,5 +231,17 @@
             android:entries="@array/biometricsTimeoutNames"
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintTop_toBottomOf="@id/tvBiometricsTimeout" />
+
+        <androidx.appcompat.widget.SwitchCompat
+            android:id="@+id/swSafeBrowsing"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="12dp"
+            android:checked="true"
+            android:text="@string/title_advanced_safe_browsing"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@id/spBiometricsTimeout"
+            app:switchPadding="12dp" />
     </androidx.constraintlayout.widget.ConstraintLayout>
 </ScrollView>

app/src/main/res/values/strings.xml

@@ -406,16 +406,18 @@
     <string name="title_advanced_confirm_html">Show reformatted messages by default</string>
     <string name="title_advanced_tracking">Automatically recognize and disable tracking images</string>
     <string name="title_advanced_display_hidden">Display hidden message texts</string>
+    <string name="title_advanced_secure">Hide from recent apps screen and prevent taking screenshots</string>
+    <string name="title_advanced_pin">PIN</string>
+    <string name="title_advanced_biometrics_timeout">Biometric authentication timeout</string>
+    <string name="title_advanced_safe_browsing" translatable="false">Safe browsing</string>
+
     <string name="title_advanced_encrypt_method">Default encryption method</string>
-    <string name="title_advanced_openpgp">OpenPGP provider</string>
-    <string name="title_advanced_autocrypt">Use Autocrypt</string>
-    <string name="title_advanced_autocrypt_mutual">Autocrypt mutual mode</string>
     <string name="title_advanced_sign_default">Sign by default</string>
     <string name="title_advanced_encrypt_default">Encrypt by default</string>
     <string name="title_advanced_auto_decrypt">Automatically decrypt messages</string>
-    <string name="title_advanced_secure">Hide from recent apps screen and prevent taking screenshots</string>
+    <string name="title_advanced_openpgp">OpenPGP provider</string>
-    <string name="title_advanced_pin">PIN</string>
+    <string name="title_advanced_autocrypt">Use Autocrypt</string>
-    <string name="title_advanced_biometrics_timeout">Biometric authentication timeout</string>
+    <string name="title_advanced_autocrypt_mutual">Autocrypt mutual mode</string>
     <string name="title_advanced_manage_certificates">Manage public keys</string>
     <string name="title_advanced_import_key">Import private key</string>
     <string name="title_advanced_manage_keys">Manage private keys</string>