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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.impl.entity;
import ch.boye.httpclientandroidlib.Header;
import ch.boye.httpclientandroidlib.HeaderElement;
import ch.boye.httpclientandroidlib.HttpException;
import ch.boye.httpclientandroidlib.HttpMessage;
import ch.boye.httpclientandroidlib.ParseException;
import ch.boye.httpclientandroidlib.ProtocolException;
import ch.boye.httpclientandroidlib.annotation.Immutable;
import ch.boye.httpclientandroidlib.entity.ContentLengthStrategy;
import ch.boye.httpclientandroidlib.protocol.HTTP;
import ch.boye.httpclientandroidlib.util.Args;
/**
* The lax implementation of the content length strategy. This class will ignore
* unrecognized transfer encodings and malformed <code>Content-Length</code>
* header values.
* <p/>
* This class recognizes "chunked" and "identitiy" transfer-coding only.
*
* @since 4.0
*/
@Immutable
public class LaxContentLengthStrategy implements ContentLengthStrategy {
public static final LaxContentLengthStrategy INSTANCE = new LaxContentLengthStrategy();
private final int implicitLen;
/**
* Creates <tt>LaxContentLengthStrategy</tt> instance with the given length used per default
* when content length is not explicitly specified in the message.
*
* @param implicitLen implicit content length.
*
* @since 4.2
*/
public LaxContentLengthStrategy(final int implicitLen) {
super();
this.implicitLen = implicitLen;
}
/**
* Creates <tt>LaxContentLengthStrategy</tt> instance. {@link ContentLengthStrategy#IDENTITY}
* is used per default when content length is not explicitly specified in the message.
*/
public LaxContentLengthStrategy() {
this(IDENTITY);
}
public long determineLength(final HttpMessage message) throws HttpException {
Args.notNull(message, "HTTP message");
final Header transferEncodingHeader = message.getFirstHeader(HTTP.TRANSFER_ENCODING);
// We use Transfer-Encoding if present and ignore Content-Length.
// RFC2616, 4.4 item number 3
if (transferEncodingHeader != null) {
final HeaderElement[] encodings;
try {
encodings = transferEncodingHeader.getElements();
} catch (final ParseException px) {
throw new ProtocolException
("Invalid Transfer-Encoding header value: " +
transferEncodingHeader, px);
}
// The chunked encoding must be the last one applied RFC2616, 14.41
final int len = encodings.length;
if (HTTP.IDENTITY_CODING.equalsIgnoreCase(transferEncodingHeader.getValue())) {
return IDENTITY;
} else if ((len > 0) && (HTTP.CHUNK_CODING.equalsIgnoreCase(
encodings[len - 1].getName()))) {
return CHUNKED;
} else {
return IDENTITY;
}
}
final Header contentLengthHeader = message.getFirstHeader(HTTP.CONTENT_LEN);
if (contentLengthHeader != null) {
long contentlen = -1;
final Header[] headers = message.getHeaders(HTTP.CONTENT_LEN);
for (int i = headers.length - 1; i >= 0; i--) {
final Header header = headers[i];
try {
contentlen = Long.parseLong(header.getValue());
break;
} catch (final NumberFormatException ignore) {
}
// See if we can have better luck with another header, if present
}
if (contentlen >= 0) {
return contentlen;
} else {
return IDENTITY;
}
}
return this.implicitLen;
}
}
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