/*******************************************************************************
* gMix open source project - https://svs.informatik.uni-hamburg.de/gmix/
* Copyright (C) 2014 SVS
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*******************************************************************************/
/**
*
*/
package userGeneratedContent.testbedPlugIns.layerPlugIns.layer5application.httpPush_v0_001.helper;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Hashtable;
import java.util.Scanner;
import java.util.Set;
/**
* @author bash
*
* Simple HTTP parser
* Contains all methods neccessary to parse a HTTP message,
* especially the header
*
*/
public final class HttpParser {
/**
* This method parses an http header as byte[] to hashtable.
* The keys are the header field names, the values are the corresponding values
* @param header
* @return Hashtable of the http header
*/
public static Hashtable<String, String> parseHeader(String header) {
Hashtable<String, String> headers = new Hashtable<String, String>();
String line;
int index;
String headerField = null;
Scanner scanner = new Scanner(header);
line = scanner.nextLine();
String[] requestLine = line.split(" ");
if (requestLine[0].trim().contains("HTTP")) {
headers.put("protocol", requestLine[0].trim());
headers.put("reply-code", requestLine[1].trim());
headers.put("reply-message", requestLine[2].trim());
} else {
headers.put("method", requestLine[0].trim());
headers.put("uri", requestLine[1].trim());
headers.put("protocol", requestLine[2].trim());
}
while (scanner.hasNextLine()) {
line = scanner.nextLine();
if (!line.isEmpty() && Character.isWhitespace(line.charAt(0))) {
headers.put(headerField, headers.get(headerField).concat(line));
} else {
index = line.indexOf(':');
if (index < 0) {
break;
} else {
headerField = line.substring(0, index).toLowerCase();
headers.put(headerField, line.substring(index + 1).trim());
}
}
}
scanner.close();
return headers;
}
/**
* Returns the length of an http header from a byte[]
* @param message
* @return length of an http header
*/
public static short getHeaderLengthFromByteArray(byte[] message) {
int i = 0;
while (i < message.length - 3) {
if (message[i] == 13 && message[i + 1] == 10
&& message[i + 2] == 13 && message[i + 3] == 10) {
i = i + 4;
return (short) i;
}
i++;
}
return -1;
}
/**
* Returns the length of an http header from an already parsed header
* @param message
* @return length of an http header
*/
public static int getBodyLengthFromHeader(Hashtable<String, String> header) {
String lengthAsString = header.get("content-length");
int length = Integer.parseInt(lengthAsString);
return length;
}
/**
* Method to determine bodytype
*
* @param header
* @return int: 0 no body; 1 Body; 2 chunked Body; 3 body till server close
*/
public static int determineBodyType(Hashtable<String, String> header,
String method) {
if (method.equals("HEAD")) {
return 0;
} else if (header.containsKey("reply-code")
&& (header.get("reply-code").equals(204)
|| header.get("reply-code").equals(304) || header.get(
"reply-code").startsWith("1"))) {
return 0;
} else if (header.containsKey("transfer-encoding")
&& header.get("transfer-encoding").contains("chunked")) {
return 2;
} else if (header.containsKey("content-length")) {
return 1;
} else {
return -1;
}
}
/**
* This method returns the first line of a chunk part
*
* @param chunk
* @return First line of a Chunk as String
*/
@Deprecated
public static String getFirstStringFromChunk(byte[] chunk) {
int i = 0;
while (i < chunk.length) {
if (chunk[i] == 13) {
if ((chunk.length >= i+2) && chunk[i + 1] == 10) {
String headLine = new String(Arrays.copyOfRange(chunk, 0,
i + 2));
return headLine;
}
}
i++;
}
return null;
}
/**
* Returns length of an http chunked body from the corresponding headline
* @param headline
* @return length of the chunk
*/
public static int getBodyLengthFromHeadLine(String headline) {
int i = headline.indexOf(";");
String size;
if (i != -1) {
size = headline.substring(0, i);
} else {
size = headline.substring(0, headline.length() - 2);
}
return Integer.parseInt(size, 16);
}
/**
* Generates an http request header from header hashtable
* @param header
* @return http request as string
*/
public static String composeGetRequest(Hashtable<String, String> header) {
Set<String> keylist = header.keySet();
String request = header.get("method") + " " + header.get("uri") + " "
+ header.get("protocol") + "\r\n";
ArrayList<String> copyKey = new ArrayList<String>(keylist);
copyKey.remove("method");
copyKey.remove("uri");
copyKey.remove("protocol");
for (String key : copyKey) {
request += key + ": " + header.get(key) + "\r\n";
}
request += "\r\n";
return request;
}
}