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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.http.provider;
import java.io.IOException;
import java.util.List;
import javax.servlet.Servlet;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.xml.namespace.QName;
import org.apache.tuscany.sca.assembly.Binding;
import org.apache.tuscany.sca.invocation.Invoker;
import org.apache.tuscany.sca.invocation.Message;
import org.apache.tuscany.sca.invocation.MessageFactory;
import org.apache.tuscany.sca.policy.Intent;
import org.apache.tuscany.sca.policy.PolicySet;
import org.apache.tuscany.sca.policy.PolicySetAttachPoint;
import org.apache.tuscany.sca.policy.authentication.basic.BasicAuthenticationPolicy;
/**
* Servlet responsible for dispatching HTTP service requests to the
* target component implementation.
*
* @version $Rev$ $Date$
*/
public class HTTPServiceListenerServlet implements Servlet {
private static final QName AUTEHTICATION_INTENT = new QName("http://www.osoa.org/xmlns/sca/1.0","authentication");
transient private Binding binding;
transient private ServletConfig config;
transient private MessageFactory messageFactory;
transient private Invoker serviceInvoker;
transient private boolean requiresAuthentication = false;
transient private BasicAuthenticationPolicy basicAuthenticationPolicy = null;
/**
* Constructs a new HTTPServiceListenerServlet.
*/
public HTTPServiceListenerServlet(Binding binding, Invoker serviceInvoker, MessageFactory messageFactory) {
this.binding = binding;
this.serviceInvoker = serviceInvoker;
this.messageFactory = messageFactory;
// find out which policies are active
if (binding instanceof PolicySetAttachPoint) {
List<Intent> intents = ((PolicySetAttachPoint)binding).getRequiredIntents();
for(Intent intent : intents) {
if(intent.getName().equals(AUTEHTICATION_INTENT)) {
requiresAuthentication = true;
}
}
List<PolicySet> policySets = ((PolicySetAttachPoint)binding).getApplicablePolicySets();
for (PolicySet ps : policySets) {
for (Object p : ps.getPolicies()) {
if (BasicAuthenticationPolicy.class.isInstance(p)) {
basicAuthenticationPolicy = (BasicAuthenticationPolicy)p;
} else {
// etc. check for other types of policy being present
}
}
}
}
}
public ServletConfig getServletConfig() {
return config;
}
public String getServletInfo() {
return "";
}
public void init(ServletConfig config) throws ServletException {
this.config = config;
}
public void destroy() {
}
public void service(ServletRequest request, ServletResponse response) throws ServletException, IOException {
if(requiresAuthentication) {
if(! hasAuthenticationHeader((HttpServletRequest)request, (HttpServletResponse)response)) {
((HttpServletResponse)response).sendError(HttpServletResponse.SC_UNAUTHORIZED);
}
}
// Dispatch the service interaction to the service invoker
Message requestMessage = messageFactory.createMessage();
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());
}
}
private boolean hasAuthenticationHeader(HttpServletRequest request, ServletResponse response) {
boolean result = false;
if(request.getHeader("Authorization") != null) {
result = true;
}
return result;
}
}
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