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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
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 * Unless required by applicable law or agreed to in writing,
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 * specific language governing permissions and limitations
 * under the License.
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package org.apache.http.impl.entity;

import org.apache.http.Header;
import org.apache.http.HeaderElement;
import org.apache.http.HttpException;
import org.apache.http.HttpMessage;
import org.apache.http.ParseException;
import org.apache.http.ProtocolException;
import org.apache.http.annotation.ThreadingBehavior;
import org.apache.http.annotation.Contract;
import org.apache.http.entity.ContentLengthStrategy;
import org.apache.http.protocol.HTTP;
import org.apache.http.util.Args;

/**
 * The lax implementation of the content length strategy. This class will ignore
 * unrecognized transfer encodings and malformed {@code Content-Length}
 * header values.
 * 

* This class recognizes "chunked" and "identitiy" transfer-coding only. * * @since 4.0 */ @Contract(threading = ThreadingBehavior.IMMUTABLE) public class LaxContentLengthStrategy implements ContentLengthStrategy { public static final LaxContentLengthStrategy INSTANCE = new LaxContentLengthStrategy(); private final int implicitLen; /** * Creates {@code LaxContentLengthStrategy} 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 LaxContentLengthStrategy(final int implicitLen) { super(); this.implicitLen = implicitLen; } /** * Creates {@code LaxContentLengthStrategy} instance. {@link ContentLengthStrategy#IDENTITY} * is used per default when content length is not explicitly specified in the message. */ public LaxContentLengthStrategy() { this(IDENTITY); } @Override public long determineLength(final HttpMessage message) throws HttpException { Args.notNull(message, "HTTP message"); final Header transferEncodingHeader = message.getFirstHeader(HTTP.TRANSFER_ENCODING); // We use Transfer-Encoding if present and ignore Content-Length. // RFC2616, 4.4 item number 3 if (transferEncodingHeader != null) { final HeaderElement[] encodings; try { encodings = transferEncodingHeader.getElements(); } catch (final ParseException px) { throw new ProtocolException ("Invalid Transfer-Encoding header value: " + transferEncodingHeader, px); } // The chunked encoding must be the last one applied RFC2616, 14.41 final int len = encodings.length; if (HTTP.IDENTITY_CODING.equalsIgnoreCase(transferEncodingHeader.getValue())) { return IDENTITY; } else if ((len > 0) && (HTTP.CHUNK_CODING.equalsIgnoreCase( encodings[len - 1].getName()))) { return CHUNKED; } else { return IDENTITY; } } final Header contentLengthHeader = message.getFirstHeader(HTTP.CONTENT_LEN); if (contentLengthHeader != null) { long contentLen = -1; final Header[] headers = message.getHeaders(HTTP.CONTENT_LEN); for (int i = headers.length - 1; i >= 0; i--) { final Header header = headers[i]; try { contentLen = Long.parseLong(header.getValue()); break; } catch (final NumberFormatException ignore) { } // See if we can have better luck with another header, if present } return contentLen >= 0 ? contentLen : IDENTITY; } return this.implicitLen; } }





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