package http.shortvers.message;
import http.shortvers.message.client.Request;
import http.shortvers.message.server.Response;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;
import java.util.Arrays;
import org.scribble.net.ScribMessage;
import org.scribble.net.ScribMessageFormatter;
public class HttpShortMessageFormatter implements ScribMessageFormatter
{
public static final Charset cs = Charset.forName("UTF8");
//private static CharsetDecoder cd = cs.newDecoder();
public HttpShortMessageFormatter()
{
}
@Override
public byte[] toBytes(ScribMessage m) throws IOException
{
return ((HttpShortMessage) m).toBytes();
}
@Override
public ScribMessage fromBytes(ByteBuffer bb) throws IOException, ClassNotFoundException
{
bb.flip();
int rem = bb.remaining();
if (rem < 2)
{
bb.compact();
return null;
}
String curr = new String(Arrays.copyOf(bb.array(), bb.remaining()), HttpShortMessageFormatter.cs);
String endOfHeaders = HttpShortMessage.CRLF + HttpShortMessage.CRLF;
if (!curr.contains(endOfHeaders))
{
bb.compact();
return null;
}
if (curr.contains(Response.CONTENT_LENGTH))
{
int eoh = curr.indexOf(endOfHeaders);
if (eoh == -1)
{
bb.compact();
return null;
}
String contentLenSplit = curr.substring(curr.indexOf(Response.CONTENT_LENGTH));
int len = Integer.parseInt(contentLenSplit.substring(Response.CONTENT_LENGTH.length()+2, contentLenSplit.indexOf('\r')).trim());
if (curr.length() < eoh+4)
{
bb.compact();
return null;
}
String body = curr.substring(eoh+4);
if (body.getBytes(HttpShortMessageFormatter.cs).length < len)
{
bb.compact();
return null;
}
byte[] bs = new byte[bb.remaining()]; // FIXME: hardcoded Response parsing based on presence of Content-Length
bb.get(bs);
bb.compact();
return parseResponse(new String(bs, HttpShortMessageFormatter.cs));
}
else
{
byte[] bs = new byte[bb.remaining()];
bb.get(bs);
bb.compact();
return parseRequest(new String(bs, HttpShortMessageFormatter.cs)); // FIXME: assuming empty-body Request if no Content-Length
}
}
// Assumes no body
private static HttpShortMessage parseRequest(String msg)
{
String get = null;
String http = null;
String host = null;
String userA = null;
String accept = null;
String acceptL = null;
String acceptE = null;
String dnt = null;
String connection = null;
String upgradeIR = null;
for (boolean eoh = false; !eoh; )
{
//if (msg.startsWith(HttpMessage.CRLF + HttpMessage.CRLF))
if (msg.startsWith(HttpShortMessage.CRLF)) // First CRLF already trimmed after last header
{
eoh = true;
//msg = msg.substring(4);
msg = msg.substring(2);
break;
}
msg = msg.replace("\\A\\s+", "");
int i = msg.indexOf(":");
if (i == -1)
{
throw new RuntimeException("Shouldn't get in here: " + msg);
}
if (msg.startsWith(HttpShortMessage.GET)) // FIXME
{
int j = msg.indexOf(' ');
get = msg.substring(j+1, msg.indexOf(' ', j+1)).trim();
j = msg.indexOf('\r');
http = msg.substring(msg.indexOf('/')+1, j).trim();
msg = msg.substring(j+2);
}
else
{
String header = msg.substring(0, i);
int j = msg.indexOf("\r");
switch (header) // FIXME: duplicates not checked
{
case Request.HOST: host = msg.substring(i+1, j).trim(); break;
case Request.USER_AGENT: userA = msg.substring(i+1, j).trim(); break;
case Request.ACCEPT: accept = msg.substring(i+1, j).trim(); break;
case Request.ACCEPT_LANGUAGE: acceptL = msg.substring(i+1, j).trim(); break;
case Request.ACCEPT_ENCODING: acceptE = msg.substring(i+1, j).trim(); break;
case Request.DO_NOT_TRACK: dnt = msg.substring(i+1, j).trim(); break;
case Request.CONNECTION: connection = msg.substring(i+1, j).trim(); break;
case Request.UPGRADE_INSECURE_REQUESTS: upgradeIR = msg.substring(i+1, j).trim(); break;
default: throw new RuntimeException("Cannot parse header field: " + msg.substring(0, j));
}
msg = msg.substring(j+2);
}
}
if (!msg.isEmpty())
{
throw new RuntimeException("Shouldn't get in here: " + msg);
}
return new Request(get, http, host, userA, accept, acceptL, acceptE, dnt, connection, upgradeIR);
}
private static HttpShortMessage parseResponse(String msg)
{
String httpv = null;
String ack = null;
String date = null;
String server = null;
String strictTS = null;
String lastMod = null;
String eTag = null;
String acceptR = null;
String contentL = null;
String vary = null;
String contentT = null;
String via = null;
String body = null;
for (boolean eoh = false; !eoh; )
{
//if (msg.startsWith(HttpMessage.CRLF + HttpMessage.CRLF))
if (msg.startsWith(HttpShortMessage.CRLF)) // First CRLF already trimmed after last header
{
eoh = true;
//msg = msg.substring(4);
msg = msg.substring(2);
break;
}
msg = msg.trim();
int i = msg.indexOf(":");
if (i == -1)
{
throw new RuntimeException("Shouldn't get in here: " + msg);
}
if (msg.startsWith(HttpShortMessage.HTTP)) // FIXME
{
int j = msg.indexOf(' ');
httpv = msg.substring(msg.indexOf('/')+1, j);
int k = msg.indexOf('\r');
ack = msg.substring(j+1, k);
/*if (!ack.equals("200 OK"))
{
if (!ack.startsWith("404"))
{
throw new RuntimeException("[TODO]: " + msg);
}
}
ack = "OK"; // Hardcoded*/
msg = msg.substring(k+2);
}
else
{
String header = msg.substring(0, i);
int j = msg.indexOf("\r");
switch (header)
{
case Response.DATE: date = msg.substring(i+1, j).trim(); break;
case Response.SERVER: server = msg.substring(i+1, j).trim(); break;
case Response.STRICT_TRANSPORT_SECURITY: strictTS = msg.substring(i+1, j).trim(); break;
case Response.LAST_MODIFIED: lastMod = msg.substring(i+1, j).trim(); break;
case Response.ETAG: eTag = msg.substring(i+1, j).trim(); break;
case Response.ACCEPT_RANGES: acceptR = msg.substring(i+1, j).trim(); break;
case Response.CONTENT_LENGTH: contentL = msg.substring(i+1, j).trim(); break;
case Response.VARY: vary = msg.substring(i+1, j).trim(); break;
case Response.CONTENT_TYPE: contentT = msg.substring(i+1, j).trim(); break;
case Response.VIA: via = msg.substring(i+1, j).trim(); break;
default:
//throw new RuntimeException("Cannot parse header field: " + msg.substring(0, msg.indexOf('\r')));
System.err.println("[Warning] Attempting to skip over response field: " + header + "\n" + msg.substring(i+1, j).trim());
}
msg = msg.substring(j+2);
}
}
body = msg;
return new Response(httpv, ack, date, server, strictTS, lastMod, eTag, acceptR, contentL, vary, contentT, via, body);
}
// FIXME: delete
@Deprecated @Override
public void writeMessage(DataOutputStream dos, ScribMessage m) throws IOException
{
throw new RuntimeException("Shouldn't get in here: " + m);
}
@Deprecated @Override
public ScribMessage readMessage(DataInputStream dis) throws IOException
{
throw new RuntimeException("Shouldn't get in here: ");
}
}