From 5b244cd71989b504d70936ce5575dc947cb5ab6b Mon Sep 17 00:00:00 2001
From: cyBerta <cyberta@riseup.net>
Date: Tue, 19 Jul 2022 14:39:11 +0200
Subject: hide tethering option on CalyxOS 11 (SDK 30)

---
 .../se/leap/bitmaskclient/base/BitmaskApp.java     |  5 ++-
 .../base/fragments/SettingsFragment.java           |  7 +++++
 .../bitmaskclient/base/utils/ConfigHelper.java     |  5 +++
 .../base/utils/SystemPropertiesHelper.java         | 36 ++++++++++++++++++++++
 4 files changed, 52 insertions(+), 1 deletion(-)
 create mode 100644 app/src/main/java/se/leap/bitmaskclient/base/utils/SystemPropertiesHelper.java

diff --git a/app/src/main/java/se/leap/bitmaskclient/base/BitmaskApp.java b/app/src/main/java/se/leap/bitmaskclient/base/BitmaskApp.java
index 6c8e3115..3f73e49d 100644
--- a/app/src/main/java/se/leap/bitmaskclient/base/BitmaskApp.java
+++ b/app/src/main/java/se/leap/bitmaskclient/base/BitmaskApp.java
@@ -43,6 +43,7 @@ import static se.leap.bitmaskclient.base.models.Constants.SHARED_PREFERENCES;
 import static se.leap.bitmaskclient.appUpdate.DownloadBroadcastReceiver.ACTION_DOWNLOAD;
 import static se.leap.bitmaskclient.appUpdate.DownloadServiceCommand.CHECK_VERSION_FILE;
 import static se.leap.bitmaskclient.appUpdate.DownloadServiceCommand.DOWNLOAD_UPDATE;
+import static se.leap.bitmaskclient.base.utils.ConfigHelper.isCalyxOSWithTetheringSupport;
 import static se.leap.bitmaskclient.base.utils.PreferenceHelper.getSavedProviderFromSharedPreferences;
 
 /**
@@ -75,7 +76,9 @@ public class BitmaskApp extends MultiDexApplication {
         torStatusObservable = TorStatusObservable.getInstance();
         EipSetupObserver.init(this, preferences);
         AppCompatDelegate.setCompatVectorFromResourcesEnabled(true);
-        TetheringStateManager.getInstance().init(this);
+        if (!isCalyxOSWithTetheringSupport(this)) {
+            TetheringStateManager.getInstance().init(this);
+        }
         if (BuildConfig.FLAVOR.contains("Fatweb")) {
             downloadBroadcastReceiver = new DownloadBroadcastReceiver();
             IntentFilter intentFilter = new IntentFilter(BROADCAST_DOWNLOAD_SERVICE_EVENT);
diff --git a/app/src/main/java/se/leap/bitmaskclient/base/fragments/SettingsFragment.java b/app/src/main/java/se/leap/bitmaskclient/base/fragments/SettingsFragment.java
index 94f737b4..9d15f839 100644
--- a/app/src/main/java/se/leap/bitmaskclient/base/fragments/SettingsFragment.java
+++ b/app/src/main/java/se/leap/bitmaskclient/base/fragments/SettingsFragment.java
@@ -11,6 +11,7 @@ import static se.leap.bitmaskclient.base.models.Constants.USE_BRIDGES;
 import static se.leap.bitmaskclient.base.models.Constants.USE_IPv6_FIREWALL;
 import static se.leap.bitmaskclient.base.utils.ConfigHelper.ObfsVpnHelper.useObfsVpn;
 import static se.leap.bitmaskclient.base.utils.PreferenceHelper.allowExperimentalTransports;
+import static se.leap.bitmaskclient.base.utils.ConfigHelper.isCalyxOSWithTetheringSupport;
 import static se.leap.bitmaskclient.base.utils.PreferenceHelper.getPreferUDP;
 import static se.leap.bitmaskclient.base.utils.PreferenceHelper.getShowAlwaysOnDialog;
 import static se.leap.bitmaskclient.base.utils.PreferenceHelper.getUseBridges;
@@ -213,6 +214,12 @@ public class SettingsFragment extends Fragment implements SharedPreferences.OnSh
 
     private void initTetheringEntry(View rootView) {
         tethering = rootView.findViewById(R.id.tethering);
+
+        if (isCalyxOSWithTetheringSupport(this.getContext())) {
+            tethering.setVisibility(GONE);
+            return;
+        }
+
         tethering.setOnClickListener((buttonView) -> {
             showTetheringAlert();
         });
diff --git a/app/src/main/java/se/leap/bitmaskclient/base/utils/ConfigHelper.java b/app/src/main/java/se/leap/bitmaskclient/base/utils/ConfigHelper.java
index 8ac5baf0..102756c4 100644
--- a/app/src/main/java/se/leap/bitmaskclient/base/utils/ConfigHelper.java
+++ b/app/src/main/java/se/leap/bitmaskclient/base/utils/ConfigHelper.java
@@ -273,6 +273,11 @@ public class ConfigHelper {
         Matcher matcher = IPv4_PATTERN.matcher(ipv4);
         return matcher.matches();
     }
+    
+    public static boolean isCalyxOSWithTetheringSupport(Context context) {
+        return SystemPropertiesHelper.contains("ro.calyxos.version", context) &&
+                Build.VERSION.SDK_INT >= Build.VERSION_CODES.R;
+    }
 
     // ObfsVpnHelper class allows us to mock BuildConfig.use_obfsvpn while
     // not mocking the whole ConfigHelper class
diff --git a/app/src/main/java/se/leap/bitmaskclient/base/utils/SystemPropertiesHelper.java b/app/src/main/java/se/leap/bitmaskclient/base/utils/SystemPropertiesHelper.java
new file mode 100644
index 00000000..b148f685
--- /dev/null
+++ b/app/src/main/java/se/leap/bitmaskclient/base/utils/SystemPropertiesHelper.java
@@ -0,0 +1,36 @@
+package se.leap.bitmaskclient.base.utils;
+
+import android.content.Context;
+
+import java.lang.reflect.Method;
+
+
+public class SystemPropertiesHelper {
+
+    /**
+     * Checks if SystemProperties contains a given key using reflection
+     * @return true if reflection was successful and the key was found
+     */
+    public static boolean contains(String key, Context context) {
+        String result = null;
+        try {
+            ClassLoader cl = context.getClassLoader();
+            @SuppressWarnings("rawtypes")
+            Class SystemProperties = cl.loadClass("android.os.SystemProperties");
+            @SuppressWarnings("rawtypes")
+            Class[] paramTypes= new Class[1];
+            paramTypes[0]= String.class;
+
+            Method get = SystemProperties.getMethod("get", paramTypes);
+            Object[] params= new Object[1];
+            params[0]= key;
+
+            result = (String) get.invoke(SystemProperties, params);
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+
+        return result != null;
+    }
+}
+
-- 
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