keepinchecker.network.PacketParser.java Source code

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Here is the source code for keepinchecker.network.PacketParser.java

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/** 
 * Copyright 2017 Brandon Ragsdale 
 * 
 * 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 keepinchecker.network;

import javax.xml.bind.DatatypeConverter;

import org.apache.commons.lang3.StringUtils;
import org.pcap4j.packet.Packet;
import org.pcap4j.util.ByteArrays;

public class PacketParser {

    public static final String GET = "GET";
    public static final String HOST = "Host";
    public static final String REFERER = "Referer";

    public static String parse(String keyword, String packet) {
        String value = "";

        if (!StringUtils.contains(packet, keyword)) {
            return value;
        }

        String[] packetSplitOnNewline = packet.split("\n");
        for (String line : packetSplitOnNewline) {
            if (StringUtils.equals(keyword, GET) && StringUtils.contains(line, keyword)) {
                value = StringUtils.substringBefore(line.split(keyword)[1], "HTTP");
                break;
            } else if ((StringUtils.contains(line, HOST) || StringUtils.contains(line, REFERER))
                    && StringUtils.contains(line, keyword)) {
                value = line.split(keyword + ":")[1];
                break;
            }
        }

        return value.trim();
    }

    public static String convertToHumanReadableFormat(Packet packet) {
        String hexString = ByteArrays.toHexString(packet.getRawData(), "");
        byte[] hexBinary = DatatypeConverter.parseHexBinary(hexString);

        return new String(hexBinary);
    }

}