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* Licensed to the Apache Software Foundation (ASF) under one
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* to you under the Apache License, Version 2.0 (the
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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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;
}
}