/*
* ====================================================================
* 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.impl.entity;
import org.apache.http.
Header;
import org.apache.http.
HeaderElement;
import org.apache.http.
HttpException;
import org.apache.http.
HttpMessage;
import org.apache.http.
ParseException;
import org.apache.http.
ProtocolException;
import org.apache.http.annotation.
ThreadingBehavior;
import org.apache.http.annotation.
Contract;
import org.apache.http.entity.
ContentLengthStrategy;
import org.apache.http.protocol.
HTTP;
import org.apache.http.util.
Args;
/**
* The lax implementation of the content length strategy. This class will ignore
* unrecognized transfer encodings and malformed {@code Content-Length}
* header values.
* <p>
* This class recognizes "chunked" and "identitiy" transfer-coding only.
*
* @since 4.0
*/
@
Contract(threading =
ThreadingBehavior.
IMMUTABLE)
public class
LaxContentLengthStrategy implements
ContentLengthStrategy {
public static final
LaxContentLengthStrategy INSTANCE = new
LaxContentLengthStrategy();
private final int
implicitLen;
/**
* Creates {@code LaxContentLengthStrategy} 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 {@code LaxContentLengthStrategy} instance. {@link ContentLengthStrategy#IDENTITY}
* is used per default when content length is not explicitly specified in the message.
*/
public
LaxContentLengthStrategy() {
this(
IDENTITY);
}
@
Override
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;
}
}