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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.HttpException;
import ch.boye.httpclientandroidlib.HttpMessage;
import ch.boye.httpclientandroidlib.HttpVersion;
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 strict implementation of the content length strategy. This class
* will throw {@link ProtocolException} if it encounters an unsupported
* transfer encoding or a malformed <code>Content-Length</code> header
* value.
* <p>
* This class recognizes "chunked" and "identitiy" transfer-coding only.
*
* @since 4.0
*/
@Immutable
public class StrictContentLengthStrategy implements ContentLengthStrategy {
public static final StrictContentLengthStrategy INSTANCE = new StrictContentLengthStrategy();
private final int implicitLen;
/**
* Creates <tt>StrictContentLengthStrategy</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 StrictContentLengthStrategy(final int implicitLen) {
super();
this.implicitLen = implicitLen;
}
/**
* Creates <tt>StrictContentLengthStrategy</tt> instance. {@link ContentLengthStrategy#IDENTITY}
* is used per default when content length is not explicitly specified in the message.
*/
public StrictContentLengthStrategy() {
this(IDENTITY);
}
public long determineLength(final HttpMessage message) throws HttpException {
Args.notNull(message, "HTTP message");
// Although Transfer-Encoding is specified as a list, in practice
// it is either missing or has the single value "chunked". So we
// treat it as a single-valued header here.
final Header transferEncodingHeader = message.getFirstHeader(HTTP.TRANSFER_ENCODING);
if (transferEncodingHeader != null) {
final String s = transferEncodingHeader.getValue();
if (HTTP.CHUNK_CODING.equalsIgnoreCase(s)) {
if (message.getProtocolVersion().lessEquals(HttpVersion.HTTP_1_0)) {
throw new ProtocolException(
"Chunked transfer encoding not allowed for " +
message.getProtocolVersion());
}
return CHUNKED;
} else if (HTTP.IDENTITY_CODING.equalsIgnoreCase(s)) {
return IDENTITY;
} else {
throw new ProtocolException(
"Unsupported transfer encoding: " + s);
}
}
final Header contentLengthHeader = message.getFirstHeader(HTTP.CONTENT_LEN);
if (contentLengthHeader != null) {
final String s = contentLengthHeader.getValue();
try {
final long len = Long.parseLong(s);
if (len < 0) {
throw new ProtocolException("Negative content length: " + s);
}
return len;
} catch (final NumberFormatException e) {
throw new ProtocolException("Invalid content length: " + s);
}
}
return this.implicitLen;
}
}
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