Match CarrierMessagingService and CarrierImsService

/*

 * 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.internal.telephony;

import android.annotation.Nullable;

import android.content.Context;

import android.content.Intent;

import android.content.pm.PackageManager;

import android.content.pm.ResolveInfo;

import android.os.PersistableBundle;

import android.telephony.CarrierConfigManager;

import android.telephony.Rlog;

import java.util.List;

/**

 * This is a basic utility class for common Carrier SMS Functions

 */

public class CarrierSmsUtils {

    protected static final boolean VDBG = false;

    protected static final String TAG = CarrierSmsUtils.class.getSimpleName();

    private static final String CARRIER_IMS_PACKAGE_KEY =

            CarrierConfigManager.KEY_CONFIG_IMS_PACKAGE_OVERRIDE_STRING;

    /** Return a Carrier-overridden IMS package, if it exists and is a CarrierSmsFilter

     *

     * @param context calling context

     * @param phone object from telephony

     * @param intent that should match a CarrierSmsFilter

     * @return the name of the IMS CarrierService package

     */

    @Nullable

    public static String getCarrierImsPackageForIntent(

            Context context, Phone phone, Intent intent) {

        String carrierImsPackage = getCarrierImsPackage(context, phone);

        if (carrierImsPackage == null) {

            if (VDBG) Rlog.v(TAG, "No CarrierImsPackage override found");

            return null;

        }

        PackageManager packageManager = context.getPackageManager();

        List<ResolveInfo> receivers = packageManager.queryIntentServices(intent, 0);

        for (ResolveInfo info : receivers) {

            if (info.serviceInfo == null) {

                Rlog.e(TAG, "Can't get service information from " + info);

                continue;

            }

            if (carrierImsPackage.equals(info.serviceInfo.packageName)) {

                return carrierImsPackage;

            }

        }

        return null;

    }

    @Nullable

    private static String getCarrierImsPackage(Context context, Phone phone) {

        CarrierConfigManager cm = (CarrierConfigManager) context.getSystemService(

                Context.CARRIER_CONFIG_SERVICE);

        if (cm == null) {

            Rlog.e(TAG, "Failed to retrieve CarrierConfigManager");

            return null;

        }

        PersistableBundle config = cm.getConfigForSubId(phone.getSubId());

        if (config == null) {

            if (VDBG) Rlog.v(TAG, "No CarrierConfig for subId:" + phone.getSubId());

            return null;

        }

        return config.getString(CARRIER_IMS_PACKAGE_KEY, null);

    }

    private CarrierSmsUtils() {}

}