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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
*
* 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package org.apache.hc.core5.http.io.support;
import java.io.IOException;
import org.apache.hc.core5.http.ClassicHttpRequest;
import org.apache.hc.core5.http.ClassicHttpResponse;
import org.apache.hc.core5.http.Header;
import org.apache.hc.core5.http.HeaderElements;
import org.apache.hc.core5.http.HttpException;
import org.apache.hc.core5.http.HttpHeaders;
import org.apache.hc.core5.http.HttpStatus;
import org.apache.hc.core5.http.io.HttpServerRequestHandler;
import org.apache.hc.core5.http.message.BasicClassicHttpResponse;
import org.apache.hc.core5.http.protocol.HttpContext;
import org.apache.hc.core5.util.Args;
/**
* {@link HttpServerRequestHandler} implementation that adds support
* for the Expect-Continue handshake to an existing
* {@link HttpServerRequestHandler}.
*
* @since 5.0
*/
public class BasicHttpServerExpectationDecorator implements HttpServerRequestHandler {
private final HttpServerRequestHandler requestHandler;
public BasicHttpServerExpectationDecorator(final HttpServerRequestHandler requestHandler) {
this.requestHandler = Args.notNull(requestHandler, "Request handler");
}
/**
* Verifies the HTTP request and decides whether it meets server expectations and the request
* processing can continue.
*
* @param request the incoming HTTP request.
* @param context the actual execution context.
* @return {@code null} if the request meets expectations or a final HTTP response
* with an error status representing the cause of expectation failure.
*/
protected ClassicHttpResponse verify(final ClassicHttpRequest request, final HttpContext context) {
return null;
}
@Override
public final void handle(
final ClassicHttpRequest request,
final ResponseTrigger responseTrigger,
final HttpContext context) throws HttpException, IOException {
final Header expect = request.getFirstHeader(HttpHeaders.EXPECT);
if (expect != null && HeaderElements.CONTINUE.equalsIgnoreCase(expect.getValue())) {
final ClassicHttpResponse response = verify(request, context);
if (response == null) {
responseTrigger.sendInformation(new BasicClassicHttpResponse(HttpStatus.SC_CONTINUE));
} else {
responseTrigger.submitResponse(response);
return;
}
}
requestHandler.handle(request, responseTrigger, context);
}
}