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/*
* ====================================================================
* 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 ch.boye.httpclientandroidlib.protocol;
import java.io.IOException;
import ch.boye.httpclientandroidlib.HttpEntity;
import ch.boye.httpclientandroidlib.HttpException;
import ch.boye.httpclientandroidlib.HttpResponse;
import ch.boye.httpclientandroidlib.HttpResponseInterceptor;
import ch.boye.httpclientandroidlib.HttpStatus;
import ch.boye.httpclientandroidlib.HttpVersion;
import ch.boye.httpclientandroidlib.ProtocolException;
import ch.boye.httpclientandroidlib.ProtocolVersion;
import ch.boye.httpclientandroidlib.annotation.Immutable;
import ch.boye.httpclientandroidlib.util.Args;
/**
* ResponseContent is the most important interceptor for outgoing responses.
* It is responsible for delimiting content length by adding
* <code>Content-Length</code> or <code>Transfer-Content</code> headers based
* on the properties of the enclosed entity and the protocol version.
* This interceptor is required for correct functioning of server side protocol
* processors.
*
* @since 4.0
*/
@Immutable
public class ResponseContent implements HttpResponseInterceptor {
private final boolean overwrite;
/**
* Default constructor. The <code>Content-Length</code> or <code>Transfer-Encoding</code>
* will cause the interceptor to throw {@link ProtocolException} if already present in the
* response message.
*/
public ResponseContent() {
this(false);
}
/**
* Constructor that can be used to fine-tune behavior of this interceptor.
*
* @param overwrite If set to <code>true</code> the <code>Content-Length</code> and
* <code>Transfer-Encoding</code> headers will be created or updated if already present.
* If set to <code>false</code> the <code>Content-Length</code> and
* <code>Transfer-Encoding</code> headers will cause the interceptor to throw
* {@link ProtocolException} if already present in the response message.
*
* @since 4.2
*/
public ResponseContent(final boolean overwrite) {
super();
this.overwrite = overwrite;
}
/**
* Processes the response (possibly updating or inserting) Content-Length and Transfer-Encoding headers.
* @param response The HttpResponse to modify.
* @param context Unused.
* @throws ProtocolException If either the Content-Length or Transfer-Encoding headers are found.
* @throws IllegalArgumentException If the response is null.
*/
public void process(final HttpResponse response, final HttpContext context)
throws HttpException, IOException {
Args.notNull(response, "HTTP response");
if (this.overwrite) {
response.removeHeaders(HTTP.TRANSFER_ENCODING);
response.removeHeaders(HTTP.CONTENT_LEN);
} else {
if (response.containsHeader(HTTP.TRANSFER_ENCODING)) {
throw new ProtocolException("Transfer-encoding header already present");
}
if (response.containsHeader(HTTP.CONTENT_LEN)) {
throw new ProtocolException("Content-Length header already present");
}
}
final ProtocolVersion ver = response.getStatusLine().getProtocolVersion();
final HttpEntity entity = response.getEntity();
if (entity != null) {
final long len = entity.getContentLength();
if (entity.isChunked() && !ver.lessEquals(HttpVersion.HTTP_1_0)) {
response.addHeader(HTTP.TRANSFER_ENCODING, HTTP.CHUNK_CODING);
} else if (len >= 0) {
response.addHeader(HTTP.CONTENT_LEN, Long.toString(entity.getContentLength()));
}
// Specify a content type if known
if (entity.getContentType() != null && !response.containsHeader(
HTTP.CONTENT_TYPE )) {
response.addHeader(entity.getContentType());
}
// Specify a content encoding if known
if (entity.getContentEncoding() != null && !response.containsHeader(
HTTP.CONTENT_ENCODING)) {
response.addHeader(entity.getContentEncoding());
}
} else {
final int status = response.getStatusLine().getStatusCode();
if (status != HttpStatus.SC_NO_CONTENT
&& status != HttpStatus.SC_NOT_MODIFIED
&& status != HttpStatus.SC_RESET_CONTENT) {
response.addHeader(HTTP.CONTENT_LEN, "0");
}
}
}
}
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