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: * . 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.HeaderElement; michael@0: import ch.boye.httpclientandroidlib.HttpException; michael@0: import ch.boye.httpclientandroidlib.HttpMessage; michael@0: import ch.boye.httpclientandroidlib.ParseException; michael@0: import ch.boye.httpclientandroidlib.ProtocolException; michael@0: import ch.boye.httpclientandroidlib.entity.ContentLengthStrategy; michael@0: import ch.boye.httpclientandroidlib.params.HttpParams; michael@0: import ch.boye.httpclientandroidlib.params.CoreProtocolPNames; michael@0: import ch.boye.httpclientandroidlib.protocol.HTTP; michael@0: michael@0: /** michael@0: * The lax implementation of the content length strategy. This class will ignore michael@0: * unrecognized transfer encodings and malformed Content-Length michael@0: * header values if the {@link CoreProtocolPNames#STRICT_TRANSFER_ENCODING} michael@0: * parameter of the given message is not set or set to false. michael@0: *

michael@0: * This class recognizes "chunked" and "identitiy" transfer-coding only. michael@0: *

michael@0: * The following parameters can be used to customize the behavior of this class: michael@0: *

michael@0: * michael@0: * @since 4.0 michael@0: */ michael@0: public class LaxContentLengthStrategy implements ContentLengthStrategy { michael@0: michael@0: public LaxContentLengthStrategy() { 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: michael@0: HttpParams params = message.getParams(); michael@0: boolean strict = params.isParameterTrue(CoreProtocolPNames.STRICT_TRANSFER_ENCODING); michael@0: michael@0: Header transferEncodingHeader = message.getFirstHeader(HTTP.TRANSFER_ENCODING); michael@0: Header contentLengthHeader = message.getFirstHeader(HTTP.CONTENT_LEN); michael@0: // We use Transfer-Encoding if present and ignore Content-Length. michael@0: // RFC2616, 4.4 item number 3 michael@0: if (transferEncodingHeader != null) { michael@0: HeaderElement[] encodings = null; michael@0: try { michael@0: encodings = transferEncodingHeader.getElements(); michael@0: } catch (ParseException px) { michael@0: throw new ProtocolException michael@0: ("Invalid Transfer-Encoding header value: " + michael@0: transferEncodingHeader, px); michael@0: } michael@0: if (strict) { michael@0: // Currently only chunk and identity are supported michael@0: for (int i = 0; i < encodings.length; i++) { michael@0: String encoding = encodings[i].getName(); michael@0: if (encoding != null && encoding.length() > 0 michael@0: && !encoding.equalsIgnoreCase(HTTP.CHUNK_CODING) michael@0: && !encoding.equalsIgnoreCase(HTTP.IDENTITY_CODING)) { michael@0: throw new ProtocolException("Unsupported transfer encoding: " + encoding); michael@0: } michael@0: } michael@0: } michael@0: // The chunked encoding must be the last one applied RFC2616, 14.41 michael@0: int len = encodings.length; michael@0: if (HTTP.IDENTITY_CODING.equalsIgnoreCase(transferEncodingHeader.getValue())) { michael@0: return IDENTITY; michael@0: } else if ((len > 0) && (HTTP.CHUNK_CODING.equalsIgnoreCase( michael@0: encodings[len - 1].getName()))) { michael@0: return CHUNKED; michael@0: } else { michael@0: if (strict) { michael@0: throw new ProtocolException("Chunk-encoding must be the last one applied"); michael@0: } michael@0: return IDENTITY; michael@0: } michael@0: } else if (contentLengthHeader != null) { michael@0: long contentlen = -1; michael@0: Header[] headers = message.getHeaders(HTTP.CONTENT_LEN); michael@0: if (strict && headers.length > 1) { michael@0: throw new ProtocolException("Multiple content length headers"); michael@0: } michael@0: for (int i = headers.length - 1; i >= 0; i--) { michael@0: Header header = headers[i]; michael@0: try { michael@0: contentlen = Long.parseLong(header.getValue()); michael@0: break; michael@0: } catch (NumberFormatException e) { michael@0: if (strict) { michael@0: throw new ProtocolException("Invalid content length: " + header.getValue()); michael@0: } michael@0: } michael@0: // See if we can have better luck with another header, if present michael@0: } michael@0: if (contentlen >= 0) { michael@0: return contentlen; michael@0: } else { michael@0: return IDENTITY; michael@0: } michael@0: } else { michael@0: return IDENTITY; michael@0: } michael@0: } michael@0: michael@0: }