hostage/src/de/tudarmstadt/informatik/hostage/protocol/HTTPS.java

package de.tudarmstadt.informatik.hostage.protocol;

import java.security.KeyStore;
import java.util.ArrayList;
import java.util.List;

import javax.net.ssl.KeyManagerFactory;
import javax.net.ssl.SSLContext;

import de.tudarmstadt.informatik.hostage.ui.MainActivity;

/**
 * HTTPS protocol
 * @author Wulf Pfeiffer
 */
public class HTTPS implements SSLProtocol<String> {

	@Override
	public int getPort() {
		return 443;
	}

	@Override
	public TALK_FIRST whoTalksFirst() {
		return TALK_FIRST.CLIENT;
	}
	
	private String lastMessage;

	@Override
	public List<String> processMessage(String message) {
		if(message != null)
			lastMessage = message;
		List<String> response = new ArrayList<String>();
		request = message + request;

		if(!message.contains(version)){
			response.add(buildPacket(c505, ""));
		} else if(message.contains(get)) {
			response.add(buildPacket(c200, get));
		} else if(message.contains(head)) {
			response.add(buildPacket(c200, head));
		} else if(message.contains(trace)){
			response.add(buildPacket(c200, trace));
		} else if(message.contains(options)){
			response.add(buildPacket(c400, options));
		} else if(message.contains(post)){
			response.add(buildPacket(c400, post));
		} else if(message.contains(put)){
			response.add(buildPacket(c400, put));
		} else if(message.contains(delete)){
			response.add(buildPacket(c400, delete));
		} else if(message.contains(connect)){
			response.add(buildPacket(c400, connect));
		} else {
			response.add(buildPacket(c400, ""));
		}
		return response;
	}

	@Override
	public boolean isClosed() {
		return true;
	}

	@Override
	public boolean isSecure() {
		return true;
	}

	@Override
	public Class<String> getType() {
		return String.class;
	}

	@Override
	public String toString() {
		return "HTTPS";
	}
	
	@Override
	public String getRequestContent() {
		return lastMessage;
	}

	@Override
	public SSLContext getSSLContext() {
		String ksName = "https_cert.bks";
		char ksPass[] = "password".toCharArray();
		KeyStore ks;
		KeyManagerFactory kmf = null;
		try {
			ks = KeyStore.getInstance(KeyStore.getDefaultType());
			ks.load(MainActivity.getContext().getAssets().open(ksName), ksPass);
			kmf = KeyManagerFactory.getInstance(KeyManagerFactory
					.getDefaultAlgorithm());
			kmf.init(ks, ksPass);
		} catch (Exception e) {
			e.printStackTrace();
		}

		SSLContext sslcontext = null;
		try {
			sslcontext = SSLContext.getInstance("SSLv3");
			sslcontext.init(kmf.getKeyManagers(), null, null);
		} catch (Exception e) {
			e.printStackTrace();
		}
		return sslcontext;
	}

	/**
	 * Builds a html response that can be sent
	 * @param code response code that was determined
	 * @param type request type that was sent by the client
	 * @return the html response
	 */
	private String buildPacket(String code, String type) {
		String doc = "";
		if(type.equals(get)) doc = htmlDoc;
		else if(type.equals(head)) doc = "";
		else if(type.equals(trace)) doc = request;
		else doc = errorHtmlPrefix + code + errorHtmlSuffix;
		
		return version + code + headerPrefix + doc.length() + headerSuffix + doc;
	}

	/** Whole request that was sent by the client */
	private String request	= "";
	private String version	= "HTTP/1.1";
	//request codes
	private String options 	= "OPTIONS";
	private String get 		= "GET";
	private String head 	= "HEAD";
	private String post		= "POST";
	private String put		= "PUT";
	private String delete	= "DELETE";
	private String trace	= "TRACE";
	private String connect	= "CONNECT";
	//response codes
	private String c200 	= " 200 OK\r\n";
	private String c400 	= " 400 Bad Request\r\n";
	private String c505 	= " 505 HTTP Version not supported\r\n";
	
	//html header pre and suffix
	private String headerPrefix =				
			"Date: Mon, 01 Jul 2013 18:27:55 GMT\r\n" +
			"Server: Apache/2.2.22 (Debian)\r\n" +
			"Vary: Accept-Encoding\r\n" +
			"Content-Length: ";
	private String headerSuffix =
			"\r\n" +	
			"Keep-Alive: timeout=5, max=100\r\n" +
			"Connection: Keep-Alive\r\n" +
			"Content-Type: text/html\r\n" +
			"\r\n";
	//html website
	private String htmlDoc = 
			"<!doctype html>\n" +
			"<html lang=\"en\">\n" +
			"<head>\n" +
			"<meta charset=\"UTF-8\">\n" +
			"<title>Test successful</title>\n" +
			"</head>\n" +
			"<body>\n" +
			"<h1>Test successful</h1>\n" +
			"<p>Congratulations.</p>\n" +
			"</body>\n" +
			"</html>";
	//html error pre and suffix
	private String errorHtmlPrefix =
			"<!doctype html>\n" +
			"<html lang=\"en\">\n" +
			"<head>\n" +
			"<meta charset=\"UTF-8\">\n" +
			"<title>";
	private String errorHtmlSuffix =
			"</title>\n" +
			"</head>\n" +
			"<body>\n" +
			"</body>\n" +
			"</html>";
}