/*
* ====================================================================
* 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
* Content-Length
header
* value.
*
* 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 StrictContentLengthStrategy 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 StrictContentLengthStrategy 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; } }