content: /*
   * Copyright (C) 2014 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.firewall;
  
  import android.app.AppGlobals;
  import android.content.ComponentName;
  import android.content.Intent;
  import android.content.pm.IPackageManager;
  import android.content.pm.PackageManager;
  import android.os.RemoteException;
  import android.os.UserHandle;
  
  import org.xmlpull.v1.XmlPullParser;
  import org.xmlpull.v1.XmlPullParserException;
  
  import java.io.IOException;
  
  public class SenderPackageFilter implements Filter {
      private static final String ATTR_NAME = "name";
  
      public final String mPackageName;
  
      public SenderPackageFilter(String packageName) {
          mPackageName = packageName;
      }
  
      @Override
      public boolean matches(IntentFirewall ifw, ComponentName resolvedComponent, Intent intent,
              int callerUid, int callerPid, String resolvedType, int receivingUid) {
          IPackageManager pm = AppGlobals.getPackageManager();
  
          int packageUid = -1;
          try {
              // USER_SYSTEM here is not important. Only app id is used and getPackageUid() will
              // return a uid whether the app is installed for a user or not.
              packageUid = pm.getPackageUid(mPackageName, PackageManager.MATCH_ANY_USER,
                      UserHandle.USER_SYSTEM);
          } catch (RemoteException ex) {
              // handled below
          }
  
          if (packageUid == -1)  {
              return false;
          }
  
          return UserHandle.isSameApp(packageUid, callerUid);
      }
  
      public static final FilterFactory FACTORY = new FilterFactory("sender-package") {
          @Override
          public Filter newFilter(XmlPullParser parser)
                  throws IOException, XmlPullParserException {
              String packageName = parser.getAttributeValue(null, ATTR_NAME);
  
              if (packageName == null) {
                  throw new XmlPullParserException(
                      "A package name must be specified.", parser, null);
              }
  
              return new SenderPackageFilter(packageName);
          }
      };
  }
  