package org.jwebsocket.netty.http;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.channel.ChannelPipeline;
import org.jboss.netty.handler.codec.frame.TooLongFrameException;
import org.jboss.netty.handler.codec.http.DefaultHttpRequest;
import org.jboss.netty.handler.codec.http.HttpChunk;
import org.jboss.netty.handler.codec.http.HttpChunkAggregator;
import org.jboss.netty.handler.codec.http.HttpMessage;
import org.jboss.netty.handler.codec.http.HttpMethod;
import org.jboss.netty.handler.codec.http.HttpRequest;
import org.jboss.netty.handler.codec.http.HttpVersion;
/**
* Decodes {@link ChannelBuffer}s into {@link HttpRequest}s and {@link HttpChunk}s.
*
* <h3>Parameters that prevents excessive memory consumption</h3>
* <table border="1">
* <tr>
* <th>Name</th><th>Meaning</th>
* </tr>
* <tr>
* <td>{@code maxInitialLineLength}</td>
* <td>The maximum length of the initial line (e.g. {@code "GET / HTTP/1.0"})
* If the length of the initial line exceeds this value, a
* {@link TooLongFrameException} will be raised.</td>
* </tr>
* <tr>
* <td>{@code maxHeaderSize}</td>
* <td>The maximum length of all headers. If the sum of the length of each
* header exceeds this value, a {@link TooLongFrameException} will be raised.</td>
* </tr>
* <tr>
* <td>{@code maxChunkSize}</td>
* <td>The maximum length of the content or each chunk. If the content length
* exceeds this value, the transfer encoding of the decoded request will be
* converted to 'chunked' and the content will be split into multiple
* {@link HttpChunk}s. If the transfer encoding of the HTTP request is
* 'chunked' already, each chunk will be split into smaller chunks if the
* length of the chunk exceeds this value. If you prefer not to handle
* {@link HttpChunk}s in your handler, insert {@link HttpChunkAggregator}
* after this decoder in the {@link ChannelPipeline}.</td>
* </tr>
* </table>
*
* @author <a href="http://www.jboss.org/netty/">The Netty Project</a>
* @author Andy Taylor (andy.taylor@jboss.org)
* @author <a href="http://gleamynode.net/">Trustin Lee</a>
* @version $Rev: 2095 $, $Date: 2010-06-20 04:46:04 +0200 (Sun, 20 Jun 2010) $
*/
public class HttpRequestDecoder extends HttpMessageDecoder {
/**
* Creates a new instance with the default
* {@code maxInitialLineLength (4096}}, {@code maxHeaderSize (8192)}, and
* {@code maxChunkSize (8192)}.
*/
public HttpRequestDecoder() {
super();
}
/**
* Creates a new instance with the specified parameters.
*/
public HttpRequestDecoder(
int maxInitialLineLength, int maxHeaderSize, int maxChunkSize) {
super(maxInitialLineLength, maxHeaderSize, maxChunkSize);
}
@Override
protected HttpMessage createMessage(String[] initialLine) throws Exception{
return new DefaultHttpRequest(
HttpVersion.valueOf(initialLine[2]), HttpMethod.valueOf(initialLine[0]), initialLine[1]);
}
@Override
protected boolean isDecodingRequest() {
return true;
}
}