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/*
* Copyright (C) 2017 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.development;
import android.content.ContentResolver;
import android.content.Context;
import android.content.Intent;
import android.content.pm.ResolveInfo;
import android.os.UserHandle;
import android.os.UserManager;
import android.provider.Settings;
import android.support.annotation.VisibleForTesting;
import android.support.v7.preference.Preference;
import android.support.v7.preference.PreferenceScreen;
import com.android.settings.core.PreferenceControllerMixin;
import com.android.settingslib.RestrictedLockUtils;
import com.android.settingslib.RestrictedLockUtils.EnforcedAdmin;
import com.android.settingslib.RestrictedSwitchPreference;
import com.android.settingslib.development.DeveloperOptionsPreferenceController;
import com.android.settingslib.wrapper.PackageManagerWrapper;
import java.util.List;
/**
* Controller to manage the state of "Verify apps over USB" toggle.
*/
public class VerifyAppsOverUsbPreferenceControllerV2 extends
DeveloperOptionsPreferenceController implements Preference.OnPreferenceChangeListener,
AdbOnChangeListener, PreferenceControllerMixin {
private static final String VERIFY_APPS_OVER_USB_KEY = "verify_apps_over_usb";
private static final String PACKAGE_MIME_TYPE = "application/vnd.android.package-archive";
private RestrictedSwitchPreference mPreference;
@VisibleForTesting
static final int SETTING_VALUE_ON = 1;
@VisibleForTesting
static final int SETTING_VALUE_OFF = 0;
/**
* Class for indirection of RestrictedLockUtils for testing purposes. It would be nice to mock
* the appropriate methods in UserManager instead but they aren't accessible.
*/
@VisibleForTesting
class RestrictedLockUtilsDelegate {
public EnforcedAdmin checkIfRestrictionEnforced(
Context context, String userRestriction, int userId) {
return RestrictedLockUtils.checkIfRestrictionEnforced(context, userRestriction, userId);
}
}
// NB: This field is accessed using reflection in the test, please keep name in sync.
private final RestrictedLockUtilsDelegate mRestrictedLockUtils =
new RestrictedLockUtilsDelegate();
// This field is accessed using reflection in the test, please keep name in sync.
private final PackageManagerWrapper mPackageManager;
public VerifyAppsOverUsbPreferenceControllerV2(Context context) {
super(context);
mPackageManager = new PackageManagerWrapper(context.getPackageManager());
}
@Override
public boolean isAvailable() {
return Settings.Global.getInt(mContext.getContentResolver(),
Settings.Global.PACKAGE_VERIFIER_SETTING_VISIBLE, 1 /* default */) > 0;
}
@Override
public String getPreferenceKey() {
return VERIFY_APPS_OVER_USB_KEY;
}
@Override
public void displayPreference(PreferenceScreen screen) {
super.displayPreference(screen);
mPreference = (RestrictedSwitchPreference) screen.findPreference(getPreferenceKey());
}
@Override
public boolean onPreferenceChange(Preference preference, Object newValue) {
final boolean isEnabled = (Boolean) newValue;
Settings.Global.putInt(mContext.getContentResolver(),
Settings.Global.PACKAGE_VERIFIER_INCLUDE_ADB,
isEnabled ? SETTING_VALUE_ON : SETTING_VALUE_OFF);
return true;
}
@Override
public void updateState(Preference preference) {
if (!shouldBeEnabled()) {
mPreference.setChecked(false);
mPreference.setDisabledByAdmin(null);
mPreference.setEnabled(false);
return;
}
final EnforcedAdmin enforcingAdmin = mRestrictedLockUtils.checkIfRestrictionEnforced(
mContext, UserManager.ENSURE_VERIFY_APPS, UserHandle.myUserId());
if (enforcingAdmin != null) {
mPreference.setChecked(true);
mPreference.setDisabledByAdmin(enforcingAdmin);
return;
}
mPreference.setEnabled(true);
final boolean checked = Settings.Global.getInt(mContext.getContentResolver(),
Settings.Global.PACKAGE_VERIFIER_INCLUDE_ADB, SETTING_VALUE_ON)
!= SETTING_VALUE_OFF;
mPreference.setChecked(checked);
}
@Override
public void onAdbSettingChanged() {
if (isAvailable()) {
updateState(mPreference);
}
}
@Override
protected void onDeveloperOptionsSwitchEnabled() {
updateState(mPreference);
}
@Override
protected void onDeveloperOptionsSwitchDisabled() {
// intentional no-op
// We can rely on onAdbSettingChanged() to update this controller.
}
/**
* Checks whether the toggle should be enabled depending on whether verify apps over USB is
* possible currently. If ADB is disabled or if package verifier does not exist, the toggle
* should be disabled.
*/
private boolean shouldBeEnabled() {
final ContentResolver cr = mContext.getContentResolver();
if (Settings.Global.getInt(cr, Settings.Global.ADB_ENABLED,
AdbPreferenceController.ADB_SETTING_OFF)
== AdbPreferenceController.ADB_SETTING_OFF) {
return false;
}
if (Settings.Global.getInt(cr, Settings.Global.PACKAGE_VERIFIER_ENABLE, SETTING_VALUE_ON)
== SETTING_VALUE_OFF) {
return false;
} else {
final Intent verification = new Intent(Intent.ACTION_PACKAGE_NEEDS_VERIFICATION);
verification.setType(PACKAGE_MIME_TYPE);
verification.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
final List<ResolveInfo> receivers = mPackageManager.queryBroadcastReceivers(
verification, 0 /* flags */);
if (receivers.size() == 0) {
return false;
}
}
return true;
}
}
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