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/*
* $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk/module-main/src/main/java/org/apache/http/protocol/RequestContent.java $
* $Revision: 573864 $
* $Date: 2007-09-08 08:53:25 -0700 (Sat, 08 Sep 2007) $
*
* ====================================================================
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package org.apache.http.protocol;
import java.io.IOException;
import org.apache.http.HttpEntity;
import org.apache.http.HttpEntityEnclosingRequest;
import org.apache.http.HttpException;
import org.apache.http.HttpRequest;
import org.apache.http.HttpRequestInterceptor;
import org.apache.http.HttpVersion;
import org.apache.http.ProtocolVersion;
import org.apache.http.ProtocolException;
/**
* A request interceptor that decides about the transport encoding.
*
* @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a>
*
* @version $Revision: 573864 $
*
* @since 4.0
*/
public class RequestContent implements HttpRequestInterceptor {
public RequestContent() {
super();
}
public void process(final HttpRequest request, final HttpContext context)
throws HttpException, IOException {
if (request == null) {
throw new IllegalArgumentException("HTTP request may not be null");
}
if (request instanceof HttpEntityEnclosingRequest) {
if (request.containsHeader(HTTP.TRANSFER_ENCODING)) {
throw new ProtocolException("Transfer-encoding header already present");
}
if (request.containsHeader(HTTP.CONTENT_LEN)) {
throw new ProtocolException("Content-Length header already present");
}
ProtocolVersion ver = request.getRequestLine().getProtocolVersion();
HttpEntity entity = ((HttpEntityEnclosingRequest)request).getEntity();
if (entity == null) {
request.addHeader(HTTP.CONTENT_LEN, "0");
return;
}
// Must specify a transfer encoding or a content length
if (entity.isChunked() || entity.getContentLength() < 0) {
if (ver.lessEquals(HttpVersion.HTTP_1_0)) {
throw new ProtocolException(
"Chunked transfer encoding not allowed for " + ver);
}
request.addHeader(HTTP.TRANSFER_ENCODING, HTTP.CHUNK_CODING);
} else {
request.addHeader(HTTP.CONTENT_LEN, Long.toString(entity.getContentLength()));
}
// Specify a content type if known
if (entity.getContentType() != null && !request.containsHeader(
HTTP.CONTENT_TYPE )) {
request.addHeader(entity.getContentType());
}
// Specify a content encoding if known
if (entity.getContentEncoding() != null && !request.containsHeader(
HTTP.CONTENT_ENCODING)) {
request.addHeader(entity.getContentEncoding());
}
}
}
}