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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.
*/
package org.apache.tuscany.sca.binding.rest.provider;
import java.io.IOException;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import javax.servlet.Servlet;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.tuscany.sca.assembly.Binding;
import org.apache.tuscany.sca.binding.rest.RESTBinding;
import org.apache.tuscany.sca.common.http.HTTPCacheContext;
import org.apache.tuscany.sca.common.http.HTTPContext;
import org.apache.tuscany.sca.common.http.HTTPHeader;
import org.apache.tuscany.sca.common.http.ThreadHTTPContext;
import org.apache.tuscany.sca.common.http.cors.CORSHeaderProcessor;
import org.apache.tuscany.sca.invocation.Invoker;
import org.apache.tuscany.sca.invocation.Message;
import org.apache.tuscany.sca.invocation.MessageFactory;
/**
* Servlet responsible for dispatching HTTP service requests to the
* target component implementation.
*
* @version $Rev$ $Date$
*/
public class RESTServiceListenerServlet extends HttpServlet implements Servlet {
private static final long serialVersionUID = -5543706958107836637L;
transient private RESTBinding binding;
transient private ServletConfig config;
transient private MessageFactory messageFactory;
transient private Invoker serviceInvoker;
/**
* Constructs a new HTTPServiceListenerServlet.
*/
public RESTServiceListenerServlet(Binding binding, Invoker serviceInvoker, MessageFactory messageFactory) {
this.binding = (RESTBinding)binding;
this.serviceInvoker = serviceInvoker;
this.messageFactory = messageFactory;
}
public ServletConfig getServletConfig() {
return config;
}
public String getServletInfo() {
return "";
}
public void init(ServletConfig config) throws ServletException {
this.config = config;
}
public void destroy() {
}
@Override
public void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
if (binding.isCORS()) {
CORSHeaderProcessor.processCORS(binding.getCORSConfiguration(), request, response);
}
HTTPContext bindingContext = new HTTPContext();
bindingContext.setHttpRequest(request);
bindingContext.setHttpResponse(response);
ThreadHTTPContext.setHTTPContext(bindingContext);
try {
// Dispatch the service interaction to the service invoker
Message requestMessage = messageFactory.createMessage();
requestMessage.setBindingContext(bindingContext);
requestMessage.setBody(new Object[] {request, response});
Message responseMessage = serviceInvoker.invoke(requestMessage);
if (responseMessage.isFault()) {
// Turn a fault into an exception
//throw new ServletException((Throwable)responseMessage.getBody());
Throwable e = (Throwable)responseMessage.getBody();
((HttpServletResponse)response).sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, e.toString());
} else {
//handles declarative headers configured on the composite
for (HTTPHeader header : binding.getHttpHeaders()) {
//treat special headers that need to be calculated
if (header.getName().equalsIgnoreCase("Expires")) {
GregorianCalendar calendar = new GregorianCalendar();
calendar.setTime(new Date());
calendar.add(Calendar.HOUR, Integer.parseInt(header.getValue()));
response.setHeader("Expires", HTTPCacheContext.RFC822DateFormat.format(calendar.getTime()));
} else {
//default behaviour to pass the header value to HTTP response
response.setHeader(header.getName(), header.getValue());
}
}
}
} finally {
ThreadHTTPContext.removeHTTPContext();
}
}
}
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