com.facebook.presto.jdbc.internal.apache.http.protocol.RequestContent Maven / Gradle / Ivy
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* 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,
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* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
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*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
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* .
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*/
package com.facebook.presto.jdbc.internal.apache.http.protocol;
import java.io.IOException;
import com.facebook.presto.jdbc.internal.apache.http.HttpEntity;
import com.facebook.presto.jdbc.internal.apache.http.HttpEntityEnclosingRequest;
import com.facebook.presto.jdbc.internal.apache.http.HttpException;
import com.facebook.presto.jdbc.internal.apache.http.HttpRequest;
import com.facebook.presto.jdbc.internal.apache.http.HttpRequestInterceptor;
import com.facebook.presto.jdbc.internal.apache.http.HttpVersion;
import com.facebook.presto.jdbc.internal.apache.http.ProtocolException;
import com.facebook.presto.jdbc.internal.apache.http.ProtocolVersion;
import com.facebook.presto.jdbc.internal.apache.http.annotation.ThreadingBehavior;
import com.facebook.presto.jdbc.internal.apache.http.annotation.Contract;
import com.facebook.presto.jdbc.internal.apache.http.util.Args;
/**
* RequestContent is the most important interceptor for outgoing requests.
* It is responsible for delimiting content length by adding
* {@code Content-Length} or {@code Transfer-Content} headers based
* on the properties of the enclosed entity and the protocol version.
* This interceptor is required for correct functioning of client side protocol
* processors.
*
* @since 4.0
*/
@Contract(threading = ThreadingBehavior.IMMUTABLE)
public class RequestContent implements HttpRequestInterceptor {
private final boolean overwrite;
/**
* Default constructor. The {@code Content-Length} or {@code Transfer-Encoding}
* will cause the interceptor to throw {@link ProtocolException} if already present in the
* response message.
*/
public RequestContent() {
this(false);
}
/**
* Constructor that can be used to fine-tune behavior of this interceptor.
*
* @param overwrite If set to {@code true} the {@code Content-Length} and
* {@code Transfer-Encoding} headers will be created or updated if already present.
* If set to {@code false} the {@code Content-Length} and
* {@code Transfer-Encoding} headers will cause the interceptor to throw
* {@link ProtocolException} if already present in the response message.
*
* @since 4.2
*/
public RequestContent(final boolean overwrite) {
super();
this.overwrite = overwrite;
}
@Override
public void process(final HttpRequest request, final HttpContext context)
throws HttpException, IOException {
Args.notNull(request, "HTTP request");
if (request instanceof HttpEntityEnclosingRequest) {
if (this.overwrite) {
request.removeHeaders(HTTP.TRANSFER_ENCODING);
request.removeHeaders(HTTP.CONTENT_LEN);
} else {
if (request.containsHeader(HTTP.TRANSFER_ENCODING)) {
throw new ProtocolException("Transfer-encoding header already present");
}
if (request.containsHeader(HTTP.CONTENT_LEN)) {
throw new ProtocolException("Content-Length header already present");
}
}
final ProtocolVersion ver = request.getRequestLine().getProtocolVersion();
final HttpEntity entity = ((HttpEntityEnclosingRequest)request).getEntity();
if (entity == null) {
request.addHeader(HTTP.CONTENT_LEN, "0");
return;
}
// Must specify a transfer encoding or a content length
if (entity.isChunked() || entity.getContentLength() < 0) {
if (ver.lessEquals(HttpVersion.HTTP_1_0)) {
throw new ProtocolException(
"Chunked transfer encoding not allowed for " + ver);
}
request.addHeader(HTTP.TRANSFER_ENCODING, HTTP.CHUNK_CODING);
} else {
request.addHeader(HTTP.CONTENT_LEN, Long.toString(entity.getContentLength()));
}
// Specify a content type if known
if (entity.getContentType() != null && !request.containsHeader(
HTTP.CONTENT_TYPE )) {
request.addHeader(entity.getContentType());
}
// Specify a content encoding if known
if (entity.getContentEncoding() != null && !request.containsHeader(
HTTP.CONTENT_ENCODING)) {
request.addHeader(entity.getContentEncoding());
}
}
}
}
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