src/com/android/settings/notification/NotificationAccessSettings.java

/*
 * Copyright (C) 2010 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.notification;

import android.app.Dialog;
import android.app.NotificationManager;
import android.app.settings.SettingsEnums;
import android.content.ComponentName;
import android.content.Context;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.UserManager;
import android.provider.SearchIndexableResource;
import android.provider.Settings;
import android.service.notification.NotificationListenerService;
import android.widget.Toast;

import androidx.annotation.VisibleForTesting;
import androidx.appcompat.app.AlertDialog;
import androidx.fragment.app.Fragment;

import com.android.settings.R;
import com.android.settings.core.instrumentation.InstrumentedDialogFragment;
import com.android.settings.overlay.FeatureFactory;
import com.android.settings.search.BaseSearchIndexProvider;
import com.android.settings.search.Indexable;
import com.android.settings.utils.ManagedServiceSettings;
import com.android.settingslib.search.SearchIndexable;

import java.util.ArrayList;
import java.util.List;

/**
 * Settings screen for managing notification listener permissions
 */
@SearchIndexable
public class NotificationAccessSettings extends ManagedServiceSettings {
    private static final String TAG = "NotificationAccessSettings";
    private static final Config CONFIG = new Config.Builder()
            .setTag(TAG)
            .setSetting(Settings.Secure.ENABLED_NOTIFICATION_LISTENERS)
            .setIntentAction(NotificationListenerService.SERVICE_INTERFACE)
            .setPermission(android.Manifest.permission.BIND_NOTIFICATION_LISTENER_SERVICE)
            .setNoun("notification listener")
            .setWarningDialogTitle(R.string.notification_listener_security_warning_title)
            .setWarningDialogSummary(R.string.notification_listener_security_warning_summary)
            .setEmptyText(R.string.no_notification_listeners)
            .build();

    private NotificationManager mNm;

    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        final Context ctx = getContext();
        if (UserManager.get(ctx).isManagedProfile()) {
            // Apps in the work profile do not support notification listeners.
            Toast.makeText(ctx, R.string.notification_settings_work_profile, Toast.LENGTH_SHORT)
                .show();
            finish();
        }
    }

    @Override
    public int getMetricsCategory() {
        return SettingsEnums.NOTIFICATION_ACCESS;
    }

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        mNm = context.getSystemService(NotificationManager.class);
    }

    @Override
    protected Config getConfig() {
        return CONFIG;
    }

    @Override
    protected boolean setEnabled(ComponentName service, String title, boolean enable) {
        logSpecialPermissionChange(enable, service.getPackageName());
        if (!enable) {
            if (!isServiceEnabled(service)) {
                return true; // already disabled
            }
            // show a friendly dialog
            new FriendlyWarningDialogFragment()
                    .setServiceInfo(service, title, this)
                    .show(getFragmentManager(), "friendlydialog");
            return false;
        } else {
            if (isServiceEnabled(service)) {
                return true; // already enabled
            }
            // show a scary dialog
            new ScaryWarningDialogFragment()
                    .setServiceInfo(service, title, this)
                    .show(getFragmentManager(), "dialog");
            return false;
        }
    }

    @Override
    protected boolean isServiceEnabled(ComponentName cn) {
        return mNm.isNotificationListenerAccessGranted(cn);
    }

    @Override
    protected void enable(ComponentName service) {
        mNm.setNotificationListenerAccessGranted(service, true);
    }

    @Override
    protected int getPreferenceScreenResId() {
        return R.xml.notification_access_settings;
    }

    @VisibleForTesting
    void logSpecialPermissionChange(boolean enable, String packageName) {
        int logCategory = enable ? SettingsEnums.APP_SPECIAL_PERMISSION_NOTIVIEW_ALLOW
                : SettingsEnums.APP_SPECIAL_PERMISSION_NOTIVIEW_DENY;
        FeatureFactory.getFactory(getContext()).getMetricsFeatureProvider().action(getContext(),
                logCategory, packageName);
    }

    private static void disable(final NotificationAccessSettings parent, final ComponentName cn) {
        parent.mNm.setNotificationListenerAccessGranted(cn, false);
        AsyncTask.execute(() -> {
            if (!parent.mNm.isNotificationPolicyAccessGrantedForPackage(
                    cn.getPackageName())) {
                parent.mNm.removeAutomaticZenRules(cn.getPackageName());
            }
        });
    }

    public static class FriendlyWarningDialogFragment extends InstrumentedDialogFragment {
        static final String KEY_COMPONENT = "c";
        static final String KEY_LABEL = "l";

        public FriendlyWarningDialogFragment setServiceInfo(ComponentName cn, String label,
                Fragment target) {
            Bundle args = new Bundle();
            args.putString(KEY_COMPONENT, cn.flattenToString());
            args.putString(KEY_LABEL, label);
            setArguments(args);
            setTargetFragment(target, 0);
            return this;
        }

        @Override
        public int getMetricsCategory() {
            return SettingsEnums.DIALOG_DISABLE_NOTIFICATION_ACCESS;
        }

        @Override
        public Dialog onCreateDialog(Bundle savedInstanceState) {
            final Bundle args = getArguments();
            final String label = args.getString(KEY_LABEL);
            final ComponentName cn = ComponentName.unflattenFromString(args
                    .getString(KEY_COMPONENT));
            NotificationAccessSettings parent = (NotificationAccessSettings) getTargetFragment();

            final String summary = getResources().getString(
                    R.string.notification_listener_disable_warning_summary, label);
            return new AlertDialog.Builder(getContext())
                    .setMessage(summary)
                    .setCancelable(true)
                    .setPositiveButton(R.string.notification_listener_disable_warning_confirm,
                            (dialog, id) -> disable(parent, cn))
                    .setNegativeButton(R.string.notification_listener_disable_warning_cancel,
                            (dialog, id) -> {
                                // pass
                            })
                    .create();
        }
    }

    public static final Indexable.SearchIndexProvider SEARCH_INDEX_DATA_PROVIDER =
            new BaseSearchIndexProvider() {
                @Override
                public List<SearchIndexableResource> getXmlResourcesToIndex(Context context,
                        boolean enabled) {
                    final List<SearchIndexableResource> result = new ArrayList<>();

                    final SearchIndexableResource sir = new SearchIndexableResource(context);
                    sir.xmlResId = R.xml.notification_access_settings;
                    result.add(sir);
                    return result;
                }
            };
}