/*
* ====================================================================
* 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.ogt.http.impl.entity;
import org.apache.ogt.http.Header;
import org.apache.ogt.http.HttpException;
import org.apache.ogt.http.HttpMessage;
import org.apache.ogt.http.HttpVersion;
import org.apache.ogt.http.ProtocolException;
import org.apache.ogt.http.entity.ContentLengthStrategy;
import org.apache.ogt.http.protocol.HTTP;
/**
* 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
*/
public class StrictContentLengthStrategy implements ContentLengthStrategy {
public StrictContentLengthStrategy() {
super();
}
public long determineLength(final HttpMessage message) throws HttpException {
if (message == null) {
throw new IllegalArgumentException("HTTP message may not be null");
}
// 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.
Header transferEncodingHeader = message.getFirstHeader(HTTP.TRANSFER_ENCODING);
Header contentLengthHeader = message.getFirstHeader(HTTP.CONTENT_LEN);
if (transferEncodingHeader != null) {
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);
}
} else if (contentLengthHeader != null) {
String s = contentLengthHeader.getValue();
try {
long len = Long.parseLong(s);
return len;
} catch (NumberFormatException e) {
throw new ProtocolException("Invalid content length: " + s);
}
} else {
return IDENTITY;
}
}
}