content: /*
   * Copyright (C) 2013 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.content.ComponentName;
  import android.content.Intent;
  import org.xmlpull.v1.XmlPullParser;
  import org.xmlpull.v1.XmlPullParserException;
  
  import java.io.IOException;
  
  class SenderPermissionFilter implements Filter {
      private static final String ATTR_NAME = "name";
  
      private final String mPermission;
  
      private SenderPermissionFilter(String permission) {
          mPermission = permission;
      }
  
      @Override
      public boolean matches(IntentFirewall ifw, ComponentName resolvedComponent, Intent intent,
              int callerUid, int callerPid, String resolvedType, int receivingUid) {
          // We assume the component is exported here. If the component is not exported, then
          // ActivityManager would only resolve to this component for callers from the same uid.
          // In this case, it doesn't matter whether the component is exported or not.
          return ifw.checkComponentPermission(mPermission, callerPid, callerUid, receivingUid,
                  true);
      }
  
      public static final FilterFactory FACTORY = new FilterFactory("sender-permission") {
          @Override
          public Filter newFilter(XmlPullParser parser)
                  throws IOException, XmlPullParserException {
              String permission = parser.getAttributeValue(null, ATTR_NAME);
              if (permission == null) {
                  throw new XmlPullParserException("Permission name must be specified.",
                          parser, null);
              }
              return new SenderPermissionFilter(permission);
          }
      };
  }
  