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      1 /*
      2  * Copyright (C) 2017 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.internal.telephony;
     18 
     19 import android.annotation.Nullable;
     20 import android.content.Context;
     21 import android.content.Intent;
     22 import android.content.pm.PackageManager;
     23 import android.content.pm.ResolveInfo;
     24 import android.os.Binder;
     25 import android.os.PersistableBundle;
     26 import android.telephony.CarrierConfigManager;
     27 import android.telephony.Rlog;
     28 
     29 import java.util.List;
     30 
     31 /**
     32  * This is a basic utility class for common Carrier SMS Functions
     33  */
     34 public class CarrierSmsUtils {
     35     protected static final boolean VDBG = false;
     36     protected static final String TAG = CarrierSmsUtils.class.getSimpleName();
     37 
     38     private static final String CARRIER_IMS_PACKAGE_KEY =
     39             CarrierConfigManager.KEY_CONFIG_IMS_PACKAGE_OVERRIDE_STRING;
     40 
     41     /** Return a Carrier-overridden IMS package, if it exists and is a CarrierSmsFilter
     42      *
     43      * @param context calling context
     44      * @param phone object from telephony
     45      * @param intent that should match a CarrierSmsFilter
     46      * @return the name of the IMS CarrierService package
     47      */
     48     @Nullable
     49     public static String getCarrierImsPackageForIntent(
     50             Context context, Phone phone, Intent intent) {
     51 
     52         String carrierImsPackage = getCarrierImsPackage(context, phone);
     53         if (carrierImsPackage == null) {
     54             if (VDBG) Rlog.v(TAG, "No CarrierImsPackage override found");
     55             return null;
     56         }
     57 
     58         PackageManager packageManager = context.getPackageManager();
     59         List<ResolveInfo> receivers = packageManager.queryIntentServices(intent, 0);
     60         for (ResolveInfo info : receivers) {
     61             if (info.serviceInfo == null) {
     62                 Rlog.e(TAG, "Can't get service information from " + info);
     63                 continue;
     64             }
     65 
     66             if (carrierImsPackage.equals(info.serviceInfo.packageName)) {
     67                 return carrierImsPackage;
     68             }
     69         }
     70         return null;
     71     }
     72 
     73     @Nullable
     74     private static String getCarrierImsPackage(Context context, Phone phone) {
     75         CarrierConfigManager cm = (CarrierConfigManager) context.getSystemService(
     76                 Context.CARRIER_CONFIG_SERVICE);
     77         if (cm == null) {
     78             Rlog.e(TAG, "Failed to retrieve CarrierConfigManager");
     79             return null;
     80         }
     81 
     82         final long identity = Binder.clearCallingIdentity();
     83         try {
     84             PersistableBundle config = cm.getConfigForSubId(phone.getSubId());
     85             if (config == null) {
     86                 if (VDBG) Rlog.v(TAG, "No CarrierConfig for subId:" + phone.getSubId());
     87                 return null;
     88             }
     89             return config.getString(CARRIER_IMS_PACKAGE_KEY, null);
     90         } finally {
     91             Binder.restoreCallingIdentity(identity);
     92         }
     93     }
     94 
     95     private CarrierSmsUtils() {}
     96 }
     97