content: /*
   * Copyright (C) 2018 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.server.appbinding.finders;
  
  import android.Manifest.permission;
  import android.app.role.OnRoleHoldersChangedListener;
  import android.app.role.RoleManager;
  import android.content.Context;
  import android.content.pm.ServiceInfo;
  import android.os.Handler;
  import android.os.IBinder;
  import android.os.UserHandle;
  import android.service.carrier.CarrierMessagingClientService;
  import android.service.carrier.ICarrierMessagingClientService;
  import android.telephony.TelephonyManager;
  import android.text.TextUtils;
  import android.util.Slog;
  
  import com.android.internal.R;
  import com.android.internal.os.BackgroundThread;
  import com.android.internal.util.CollectionUtils;
  import com.android.server.appbinding.AppBindingConstants;
  
  import java.util.function.BiConsumer;
  
  /**
   * Find the CarrierMessagingClientService service within the default SMS app.
   */
  public class CarrierMessagingClientServiceFinder
          extends AppServiceFinder<CarrierMessagingClientService, ICarrierMessagingClientService> {
  
      private final RoleManager mRoleManager;
  
      public CarrierMessagingClientServiceFinder(Context context,
              BiConsumer<AppServiceFinder, Integer> listener,
              Handler callbackHandler) {
          super(context, listener, callbackHandler);
  
          mRoleManager = context.getSystemService(RoleManager.class);
      }
  
      @Override
      protected boolean isEnabled(AppBindingConstants constants) {
          return constants.SMS_SERVICE_ENABLED
                  && mContext.getResources().getBoolean(R.bool.config_useSmsAppService);
      }
  
      @Override
      public String getAppDescription() {
          return "[Default SMS app]";
      }
  
      @Override
      protected Class<CarrierMessagingClientService> getServiceClass() {
          return CarrierMessagingClientService.class;
      }
  
      @Override
      public ICarrierMessagingClientService asInterface(IBinder obj) {
          return ICarrierMessagingClientService.Stub.asInterface(obj);
      }
  
      @Override
      protected String getServiceAction() {
          return TelephonyManager.ACTION_CARRIER_MESSAGING_CLIENT_SERVICE;
      }
  
      @Override
      protected String getServicePermission() {
          return permission.BIND_CARRIER_MESSAGING_CLIENT_SERVICE;
      }
  
      @Override
      public String getTargetPackage(int userId) {
          final String ret = CollectionUtils.firstOrNull(mRoleManager.getRoleHoldersAsUser(
                  RoleManager.ROLE_SMS, UserHandle.of(userId)));
  
          if (DEBUG) {
              Slog.d(TAG, "getTargetPackage()=" + ret);
          }
  
          return ret;
      }
  
      @Override
      public void startMonitoring() {
          mRoleManager.addOnRoleHoldersChangedListenerAsUser(
                  BackgroundThread.getExecutor(), mRoleHolderChangedListener, UserHandle.ALL);
      }
  
      @Override
      protected String validateService(ServiceInfo service) {
          final String packageName = service.packageName;
          final String process = service.processName;
  
          if (process == null || TextUtils.equals(packageName, process)) {
              return "Service must not run on the main process";
          }
          return null; // Null means accept this service.
      }
  
      @Override
      public int getBindFlags(AppBindingConstants constants) {
          return constants.SMS_APP_BIND_FLAGS;
      }
  
      private final OnRoleHoldersChangedListener mRoleHolderChangedListener = (role, user) -> {
          if (RoleManager.ROLE_SMS.equals(role)) {
              mListener.accept(CarrierMessagingClientServiceFinder.this, user.getIdentifier());
          }
      };
  }
  