io.undertow.server.handlers.HttpContinueReadHandler Maven / Gradle / Ivy
/*
* JBoss, Home of Professional Open Source.
* Copyright 2014 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* Licensed 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.
*/
package io.undertow.server.handlers;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.util.concurrent.TimeUnit;
import org.xnio.channels.StreamSinkChannel;
import org.xnio.conduits.AbstractStreamSourceConduit;
import org.xnio.conduits.StreamSourceConduit;
import io.undertow.server.ConduitWrapper;
import io.undertow.server.Connectors;
import io.undertow.server.HttpHandler;
import io.undertow.server.HttpServerExchange;
import io.undertow.server.ResponseCommitListener;
import io.undertow.server.protocol.http.HttpContinue;
import io.undertow.util.ConduitFactory;
import io.undertow.util.StatusCodes;
/**
* Handler for requests that require 100-continue responses. If an attempt is made to read from the source
* channel then a 100 continue response is sent.
*
* @author Stuart Douglas
*/
public class HttpContinueReadHandler implements HttpHandler {
private static final ConduitWrapper WRAPPER = new ConduitWrapper() {
@Override
public StreamSourceConduit wrap(final ConduitFactory factory, final HttpServerExchange exchange) {
if (exchange.isRequestChannelAvailable() && !exchange.isResponseStarted()) {
return new ContinueConduit(factory.create(), exchange);
}
return factory.create();
}
};
private final HttpHandler handler;
public HttpContinueReadHandler(final HttpHandler handler) {
this.handler = handler;
}
@Override
public void handleRequest(final HttpServerExchange exchange) throws Exception {
if (HttpContinue.requiresContinueResponse(exchange)) {
exchange.addRequestWrapper(WRAPPER);
exchange.addResponseCommitListener(ContinueResponseCommitListener.INSTANCE);
}
handler.handleRequest(exchange);
}
private enum ContinueResponseCommitListener implements ResponseCommitListener {
INSTANCE;
@Override
public void beforeCommit(HttpServerExchange exchange) {
//we are writing the response, and have not read the request then we mark this as non-persistent
if (!HttpContinue.isContinueResponseSent(exchange)) {
exchange.setPersistent(false);
//we also kill the request channel, because it is unusable now
if (!exchange.isRequestComplete()) {
exchange.getConnection().terminateRequestChannel(exchange);
} else {
Connectors.terminateRequest(exchange);
}
}
}
}
private static final class ContinueConduit extends AbstractStreamSourceConduit implements StreamSourceConduit {
private boolean sent = false;
private HttpContinue.ContinueResponseSender response = null;
private final HttpServerExchange exchange;
protected ContinueConduit(final StreamSourceConduit next, final HttpServerExchange exchange) {
super(next);
this.exchange = exchange;
}
@Override
public long transferTo(final long position, final long count, final FileChannel target) throws IOException {
if (exchange.getStatusCode() == StatusCodes.EXPECTATION_FAILED) {
//rejected
Connectors.terminateRequest(exchange);
return -1;
}
if (!sent) {
sent = true;
response = HttpContinue.createResponseSender(exchange);
}
if (response != null) {
if (!response.send()) {
return 0;
}
response = null;
}
return super.transferTo(position, count, target);
}
@Override
public long transferTo(final long count, final ByteBuffer throughBuffer, final StreamSinkChannel target) throws IOException {
if (exchange.getStatusCode() == StatusCodes.EXPECTATION_FAILED) {
//rejected
Connectors.terminateRequest(exchange);
return -1;
}
if (!sent) {
sent = true;
response = HttpContinue.createResponseSender(exchange);
}
if (response != null) {
if (!response.send()) {
return 0;
}
response = null;
}
return super.transferTo(count, throughBuffer, target);
}
@Override
public int read(final ByteBuffer dst) throws IOException {
if (exchange.getStatusCode() == StatusCodes.EXPECTATION_FAILED) {
//rejected
Connectors.terminateRequest(exchange);
return -1;
}
if (!sent) {
sent = true;
response = HttpContinue.createResponseSender(exchange);
}
if (response != null) {
if (!response.send()) {
return 0;
}
response = null;
}
return super.read(dst);
}
@Override
public long read(final ByteBuffer[] dsts, final int offs, final int len) throws IOException {
if (exchange.getStatusCode() == StatusCodes.EXPECTATION_FAILED) {
//rejected
Connectors.terminateRequest(exchange);
return -1;
}
if (!sent) {
sent = true;
response = HttpContinue.createResponseSender(exchange);
}
if (response != null) {
if (!response.send()) {
return 0;
}
response = null;
}
return super.read(dsts, offs, len);
}
@Override
public void awaitReadable(final long time, final TimeUnit timeUnit) throws IOException {
if (exchange.getStatusCode() == StatusCodes.EXPECTATION_FAILED) {
//rejected
return;
}
if (!sent) {
sent = true;
response = HttpContinue.createResponseSender(exchange);
}
long exitTime = System.currentTimeMillis() + timeUnit.toMillis(time);
if (response != null) {
while (!response.send()) {
long currentTime = System.currentTimeMillis();
if (currentTime > exitTime) {
return;
}
response.awaitWritable(exitTime - currentTime, TimeUnit.MILLISECONDS);
}
response = null;
}
long currentTime = System.currentTimeMillis();
super.awaitReadable(exitTime - currentTime, TimeUnit.MILLISECONDS);
}
@Override
public void awaitReadable() throws IOException {
if (exchange.getStatusCode() == StatusCodes.EXPECTATION_FAILED) {
//rejected
return;
}
if (!sent) {
sent = true;
response = HttpContinue.createResponseSender(exchange);
}
if (response != null) {
while (!response.send()) {
response.awaitWritable();
}
response = null;
}
super.awaitReadable();
}
}
}