From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Tad <tad@spotco.us>
Date: Wed, 20 Apr 2022 01:04:27 -0400
Subject: [PATCH] Add a toggle for CarrierConfig2 enablement

Copy and pasted from the GrapheneOS exec spawning toggle patch
TODO: MOVE OUT OF SECURITY CATEGORY

Change-Id: Ibea6ea9bed1c2ae3491f403d9e5c17c1d1c403f1
Signed-off-by: Tad <tad@spotco.us>
---
 res/values/strings.xml                        |   3 +
 res/xml/security_dashboard_settings.xml       |   6 +
 .../CarrierConfig2PreferenceController.java   | 106 ++++++++++++++++++
 .../settings/security/SecuritySettings.java   |   1 +
 4 files changed, 116 insertions(+)
 create mode 100644 src/com/android/settings/security/CarrierConfig2PreferenceController.java

diff --git a/res/values/strings.xml b/res/values/strings.xml
index 6191f0a147..1d46451503 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -13136,6 +13136,9 @@
     <string name="sig_spoof_title">Unprivileged microG enablement</string>
     <string name="sig_spoof_summary">Allows official builds of microG apps to function. Not supported, not recommended. May break apps and/or degrade their security model. Notes: 1) microG connects directly to Google, 2) apps talking to microG do so using proprietary Google libraries, 3) microG can download/execute proprietary code from Google.</string>
 
+    <string name="carrierconfig2_title">Enable CarrierConfig2</string>
+    <string name="carrierconfig2_summary">Use a larger Google database instead of the AOSP database for carrier specific configurations. May improve cellular network compatibility &amp; functionality. Requires reboot.</string>
+
     <!-- Title for the top level Privacy Settings [CHAR LIMIT=30]-->
     <string name="privacy_dashboard_title">Privacy</string>
     <!-- Summary for the top level Privacy Settings [CHAR LIMIT=NONE]-->
diff --git a/res/xml/security_dashboard_settings.xml b/res/xml/security_dashboard_settings.xml
index f5384fa104..0a18a8b8a7 100644
--- a/res/xml/security_dashboard_settings.xml
+++ b/res/xml/security_dashboard_settings.xml
@@ -87,6 +87,12 @@
             android:summary="@string/sig_spoof_summary"
             android:persistent="false" />
 
+        <SwitchPreference
+            android:key="carrierconfig2"
+            android:title="@string/carrierconfig2_title"
+            android:summary="@string/carrierconfig2_summary"
+            android:persistent="false" />
+
         <com.android.settingslib.RestrictedPreference
             android:key="biometric_settings"
             android:title="@string/security_settings_biometric_preference_title"
diff --git a/src/com/android/settings/security/CarrierConfig2PreferenceController.java b/src/com/android/settings/security/CarrierConfig2PreferenceController.java
new file mode 100644
index 0000000000..a3e5aa1759
--- /dev/null
+++ b/src/com/android/settings/security/CarrierConfig2PreferenceController.java
@@ -0,0 +1,106 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License
+ */
+
+package com.android.settings.security;
+
+import android.content.Context;
+
+import android.os.UserHandle;
+import android.os.UserManager;
+import android.os.SystemProperties;
+
+import android.provider.Settings;
+
+import androidx.preference.Preference;
+import androidx.preference.PreferenceCategory;
+import androidx.preference.PreferenceGroup;
+import androidx.preference.PreferenceScreen;
+import androidx.preference.TwoStatePreference;
+import androidx.preference.SwitchPreference;
+
+import com.android.internal.widget.LockPatternUtils;
+import com.android.settings.core.PreferenceControllerMixin;
+import com.android.settingslib.core.AbstractPreferenceController;
+import com.android.settingslib.core.lifecycle.events.OnResume;
+
+public class CarrierConfig2PreferenceController extends AbstractPreferenceController
+        implements PreferenceControllerMixin, OnResume, Preference.OnPreferenceChangeListener {
+
+    private static final String SYS_KEY_CARRIERCONFIG2_ENABLE = "persist.security.carrierconfig2";
+    private static final String PREF_KEY_CARRIERCONFIG2_ENABLE = "carrierconfig2";
+    private static final String PREF_KEY_SECURITY_CATEGORY = "security_category";
+
+    private PreferenceCategory mSecurityCategory;
+    private SwitchPreference mCarrierConfig2Enable;
+    private boolean mIsAdmin;
+    private UserManager mUm;
+
+    public CarrierConfig2PreferenceController(Context context) {
+        super(context);
+        mUm = UserManager.get(context);
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        super.displayPreference(screen);
+        mSecurityCategory = screen.findPreference(PREF_KEY_SECURITY_CATEGORY);
+        updatePreferenceState();
+    }
+
+    @Override
+    public boolean isAvailable() {
+        mIsAdmin = mUm.isAdminUser();
+        return mIsAdmin;
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return PREF_KEY_CARRIERCONFIG2_ENABLE;
+    }
+
+    // TODO: should we use onCreatePreferences() instead?
+    private void updatePreferenceState() {
+        if (mSecurityCategory == null) {
+            return;
+        }
+
+        if (mIsAdmin) {
+            mCarrierConfig2Enable = (SwitchPreference) mSecurityCategory.findPreference(PREF_KEY_CARRIERCONFIG2_ENABLE);
+            mCarrierConfig2Enable.setChecked(SystemProperties.getInt(SYS_KEY_CARRIERCONFIG2_ENABLE, 0) == 1);
+        } else {
+            mSecurityCategory.removePreference(mSecurityCategory.findPreference(PREF_KEY_CARRIERCONFIG2_ENABLE));
+        }
+    }
+
+    @Override
+    public void onResume() {
+        updatePreferenceState();
+        if (mCarrierConfig2Enable != null) {
+                boolean mode = mCarrierConfig2Enable.isChecked();
+                SystemProperties.set(SYS_KEY_CARRIERCONFIG2_ENABLE, mode ? "1" : "0");
+        }
+    }
+
+    @Override
+    public boolean onPreferenceChange(Preference preference, Object value) {
+        final String key = preference.getKey();
+        if (PREF_KEY_CARRIERCONFIG2_ENABLE.equals(key)) {
+            final boolean mode = !mCarrierConfig2Enable.isChecked();
+            SystemProperties.set(SYS_KEY_CARRIERCONFIG2_ENABLE, mode ? "1" : "0");
+        }
+        return true;
+    }
+}
diff --git a/src/com/android/settings/security/SecuritySettings.java b/src/com/android/settings/security/SecuritySettings.java
index 0ac2ace282..6e0dba6668 100644
--- a/src/com/android/settings/security/SecuritySettings.java
+++ b/src/com/android/settings/security/SecuritySettings.java
@@ -127,6 +127,7 @@ public class SecuritySettings extends DashboardFragment {
         securityPreferenceControllers.add(new NativeDebugPreferenceController(context));
         securityPreferenceControllers.add(new HostsPreferenceController(context));
         securityPreferenceControllers.add(new SigSpoofPreferenceController(context));
+        securityPreferenceControllers.add(new CarrierConfig2PreferenceController(context));
         controllers.add(new PreferenceCategoryController(context, SECURITY_CATEGORY)
                 .setChildren(securityPreferenceControllers));
         controllers.addAll(securityPreferenceControllers);