content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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.manning.hip.ch11;
  
  import com.manning.hip.common.Range;
  import org.apache.commons.lang.StringUtils;
  import org.apache.pig.FilterFunc;
  import org.apache.pig.FuncSpec;
  import org.apache.pig.data.DataType;
  import org.apache.pig.data.Tuple;
  import org.apache.pig.impl.logicalLayer.FrontendException;
  import org.apache.pig.impl.logicalLayer.schema.Schema;
  
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.regex.Pattern;
  
  /**
   * This function removes tuples that contain a private IP address.
   */
  public class IsPrivateIP extends FilterFunc {
  
    protected List<Range<Long>> ipRanges;
  
    public IsPrivateIP() {
      ipRanges = new ArrayList<Range<Long>>();
      ipRanges.add(getRange("10.0.0.0", "10.255.255.255"));
      ipRanges.add(getRange("172.16.0.0", "172.31.255.255"));
      ipRanges.add(getRange("192.168.0.0", "192.168.255.255"));
    }
  
    @Override
    public List<FuncSpec> getArgToFuncMapping()
        throws FrontendException {
      List<FuncSpec> funcList = new ArrayList<FuncSpec>();
      funcList.add(new FuncSpec(this.getClass().getName(),
          new Schema(new Schema.FieldSchema(null, DataType.CHARARRAY))));
  
      return funcList;
    }
  
    @Override
    public Boolean exec(Tuple t) throws IOException {
      if (t == null || t.size() == 0)
        return false;
  
      String address = extractFieldAsString(t, 0);
      return address != null && matchesIp(ipToInt(address));
    }
  
    public static Range<Long> getRange(String startIp, String endIp) {
      return new Range<Long>(ipToInt(startIp), ipToInt(endIp));
    }
  
    public boolean matchesIp(long ip) {
      for(Range<Long> range: ipRanges) {
        if(range.contains(ip)) {
          return true;
        }
      }
      return false;
    }
  
    public String extractFieldAsString(Tuple t, int field) {
      String query;
      try {
        query = (String) t.get(field);
        if (query == null)
          return null;
        query = query.trim();
      } catch (Exception e) {
        System.err.println(
            "PrivateIPFilter: failed to process input; error - " +
                e.getMessage());
        return null;
      }
  
      if (query.equals("")) {
        return null;
      }
      return query;
    }
  
  
    public static long ipToInt(String addr) {
      String[] octets = StringUtils.split(addr, ".");
      long ip = 0;
      for (String octet : octets) {
        ip = (ip << 8) + Integer.valueOf(octet);
      }
      return ip;
    }
  
  }
  