1   /**
    2    *
    3    * Licensed to the Apache Software Foundation (ASF) under one or more
    4    * contributor license agreements.  See the NOTICE file distributed with
    5    * this work for additional information regarding copyright ownership.
    6    * The ASF licenses this file to You under the Apache License, Version 2.0
    7    * (the "License"); you may not use this file except in compliance with
    8    * the License.  You may obtain a copy of the License at
    9    *
   10    * http://www.apache.org/licenses/LICENSE-2.0
   11    *
   12    * Unless required by applicable law or agreed to in writing, software
   13    * distributed under the License is distributed on an "AS IS" BASIS,
   14    * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   15    * See the License for the specific language governing permissions and
   16    * limitations under the License.
   17    */
   18   package org.apache.openejb.server.auth;
   19   
   20   import java.util.regex.Pattern;
   21   import java.util.regex.Matcher;
   22   import java.net.InetAddress;
   23   import java.net.Inet4Address;
   24   
   25   /**
   26    * @version $Revision$ $Date$
   27    */
   28   public class ExactIPAddressPermission implements IPAddressPermission {
   29       private static final Pattern MASK_VALIDATOR = Pattern.compile("^(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})$");
   30   
   31       public static boolean canSupport(String mask) {
   32           Matcher matcher = MASK_VALIDATOR.matcher(mask);
   33           return matcher.matches();
   34       }
   35   
   36       private final byte[] bytes;
   37   
   38       public ExactIPAddressPermission(byte[] bytes) {
   39           this.bytes = bytes;
   40       }
   41   
   42       public ExactIPAddressPermission(String mask) {
   43           Matcher matcher = MASK_VALIDATOR.matcher(mask);
   44           if (false == matcher.matches()) {
   45               throw new IllegalArgumentException("Mask " + mask + " does not match pattern " + MASK_VALIDATOR.pattern());
   46           }
   47   
   48           bytes = new byte[4];
   49           for (int i = 0; i < 4; i++) {
   50               String group = matcher.group(i + 1);
   51               int value = Integer.parseInt(group);
   52               if (value < 0 || 255 < value) {
   53                   throw new IllegalArgumentException("byte #" + i + " is not valid.");
   54               }
   55               bytes[i] = (byte) value;
   56           }
   57       }
   58   
   59       public boolean implies(InetAddress address) {
   60           if (false == address instanceof Inet4Address) {
   61               return false;
   62           }
   63   
   64           byte[] byteAddress = address.getAddress();
   65           for (int i = 0; i < 4; i++) {
   66               if (byteAddress[i] != bytes[i]) {
   67                   return false;
   68               }
   69           }
   70           return true;
   71       }
   72   }