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 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
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 *   http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.http.impl.entity;

import org.apache.http.Header;
import org.apache.http.HttpException;
import org.apache.http.HttpMessage;
import org.apache.http.HttpVersion;
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 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} header
 * value.
 * 

* This class recognizes "chunked" and "identitiy" transfer-coding only. * * @since 4.0 */ @Contract(threading = ThreadingBehavior.IMMUTABLE) public class StrictContentLengthStrategy implements ContentLengthStrategy { public static final StrictContentLengthStrategy INSTANCE = new StrictContentLengthStrategy(); private final int implicitLen; /** * Creates {@code 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 {@code StrictContentLengthStrategy} instance. {@link ContentLengthStrategy#IDENTITY} * is used per default when content length is not explicitly specified in the message. */ public StrictContentLengthStrategy() { this(IDENTITY); } @Override 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; } }





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