michael@0: /*
michael@0:  * ====================================================================
michael@0:  * Licensed to the Apache Software Foundation (ASF) under one
michael@0:  * or more contributor license agreements.  See the NOTICE file
michael@0:  * distributed with this work for additional information
michael@0:  * regarding copyright ownership.  The ASF licenses this file
michael@0:  * to you under the Apache License, Version 2.0 (the
michael@0:  * "License"); you may not use this file except in compliance
michael@0:  * with the License.  You may obtain a copy of the License at
michael@0:  *
michael@0:  *   http://www.apache.org/licenses/LICENSE-2.0
michael@0:  *
michael@0:  * Unless required by applicable law or agreed to in writing,
michael@0:  * software distributed under the License is distributed on an
michael@0:  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
michael@0:  * KIND, either express or implied.  See the License for the
michael@0:  * specific language governing permissions and limitations
michael@0:  * under the License.
michael@0:  * ====================================================================
michael@0:  *
michael@0:  * This software consists of voluntary contributions made by many
michael@0:  * individuals on behalf of the Apache Software Foundation.  For more
michael@0:  * information on the Apache Software Foundation, please see
michael@0:  * <http://www.apache.org/>.
michael@0:  *
michael@0:  */
michael@0: 
michael@0: package ch.boye.httpclientandroidlib.impl.entity;
michael@0: 
michael@0: import ch.boye.httpclientandroidlib.Header;
michael@0: import ch.boye.httpclientandroidlib.HttpException;
michael@0: import ch.boye.httpclientandroidlib.HttpMessage;
michael@0: import ch.boye.httpclientandroidlib.HttpVersion;
michael@0: import ch.boye.httpclientandroidlib.ProtocolException;
michael@0: import ch.boye.httpclientandroidlib.entity.ContentLengthStrategy;
michael@0: import ch.boye.httpclientandroidlib.protocol.HTTP;
michael@0: 
michael@0: /**
michael@0:  * The strict implementation of the content length strategy. This class
michael@0:  * will throw {@link ProtocolException} if it encounters an unsupported
michael@0:  * transfer encoding or a malformed <code>Content-Length</code> header
michael@0:  * value.
michael@0:  * <p>
michael@0:  * This class recognizes "chunked" and "identitiy" transfer-coding only.
michael@0:  *
michael@0:  * @since 4.0
michael@0:  */
michael@0: public class StrictContentLengthStrategy implements ContentLengthStrategy {
michael@0: 
michael@0:     public StrictContentLengthStrategy() {
michael@0:         super();
michael@0:     }
michael@0: 
michael@0:     public long determineLength(final HttpMessage message) throws HttpException {
michael@0:         if (message == null) {
michael@0:             throw new IllegalArgumentException("HTTP message may not be null");
michael@0:         }
michael@0:         // Although Transfer-Encoding is specified as a list, in practice
michael@0:         // it is either missing or has the single value "chunked". So we
michael@0:         // treat it as a single-valued header here.
michael@0:         Header transferEncodingHeader = message.getFirstHeader(HTTP.TRANSFER_ENCODING);
michael@0:         Header contentLengthHeader = message.getFirstHeader(HTTP.CONTENT_LEN);
michael@0:         if (transferEncodingHeader != null) {
michael@0:             String s = transferEncodingHeader.getValue();
michael@0:             if (HTTP.CHUNK_CODING.equalsIgnoreCase(s)) {
michael@0:                 if (message.getProtocolVersion().lessEquals(HttpVersion.HTTP_1_0)) {
michael@0:                     throw new ProtocolException(
michael@0:                             "Chunked transfer encoding not allowed for " +
michael@0:                             message.getProtocolVersion());
michael@0:                 }
michael@0:                 return CHUNKED;
michael@0:             } else if (HTTP.IDENTITY_CODING.equalsIgnoreCase(s)) {
michael@0:                 return IDENTITY;
michael@0:             } else {
michael@0:                 throw new ProtocolException(
michael@0:                         "Unsupported transfer encoding: " + s);
michael@0:             }
michael@0:         } else if (contentLengthHeader != null) {
michael@0:             String s = contentLengthHeader.getValue();
michael@0:             try {
michael@0:                 long len = Long.parseLong(s);
michael@0:                 return len;
michael@0:             } catch (NumberFormatException e) {
michael@0:                 throw new ProtocolException("Invalid content length: " + s);
michael@0:             }
michael@0:         } else {
michael@0:             return IDENTITY;
michael@0:         }
michael@0:     }
michael@0: 
michael@0: }