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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.operationselector.rpc.provider;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.net.URLDecoder;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import javax.servlet.http.HttpServletResponse;
import javax.ws.rs.QueryParam;
import org.apache.tuscany.sca.common.http.HTTPContext;
import org.apache.tuscany.sca.common.http.HTTPUtil;
import org.apache.tuscany.sca.core.ExtensionPointRegistry;
import org.apache.tuscany.sca.interfacedef.InterfaceContract;
import org.apache.tuscany.sca.interfacedef.Operation;
import org.apache.tuscany.sca.interfacedef.java.JavaOperation;
import org.apache.tuscany.sca.invocation.Interceptor;
import org.apache.tuscany.sca.invocation.Invoker;
import org.apache.tuscany.sca.invocation.Message;
import org.apache.tuscany.sca.runtime.RuntimeComponentService;
import org.apache.tuscany.sca.runtime.RuntimeEndpoint;
/**
* RPC operation selector Interceptor.
*
* @version $Rev$ $Date$
*/
public class RPCOperationSelectorInterceptor implements Interceptor {
private ExtensionPointRegistry extensionPoints;
private RuntimeEndpoint endpoint;
private RuntimeComponentService service;
private InterfaceContract interfaceContract;
private List<Operation> serviceOperations;
private Invoker next;
public RPCOperationSelectorInterceptor(ExtensionPointRegistry extensionPoints, RuntimeEndpoint endpoint) {
this.extensionPoints = extensionPoints;
this.endpoint = endpoint;
this.service = (RuntimeComponentService)endpoint.getService();
this.interfaceContract = service.getInterfaceContract();
this.serviceOperations = service.getInterfaceContract().getInterface().getOperations();
}
public Invoker getNext() {
return next;
}
public void setNext(Invoker next) {
this.next = next;
}
public Message invoke(Message msg) {
try {
HTTPContext bindingContext = (HTTPContext)msg.getBindingContext();
if(! "get".equalsIgnoreCase(bindingContext.getHttpRequest().getMethod())) {
throw new RuntimeException("RPC Invocation only allowed over HTTP GET operations");
}
String path = URLDecoder.decode(HTTPUtil.getRequestPath(bindingContext.getHttpRequest()), "UTF-8");
if (path.startsWith("/")) {
path = path.substring(1);
}
String operationName = bindingContext.getHttpRequest().getParameter("method");
Operation operation = findOperation( operationName );
if (operation == null) {
throw new RuntimeException("Invalid Operation '" + operationName + "'" );
}
final JavaOperation javaOperation = (JavaOperation)operation;
final Method method = javaOperation.getJavaMethod();
List<Object> messageParameters = new ArrayList<Object>();
for(int i=0; i<method.getParameterTypes().length; i++) {
for(Annotation annotation : method.getParameterAnnotations()[i]) {
if (annotation instanceof QueryParam) {
QueryParam queryParam = (QueryParam) annotation;
String name = queryParam.value();
String[] values = bindingContext.getHttpRequest().getParameterValues(name);
if(values.length == 1) {
messageParameters.add(values[0]);
} else {
messageParameters.add(values);
}
}
}
}
Object[] body = new Object[messageParameters.size()];
messageParameters.toArray(body);
msg.setBody(body);
msg.setOperation(operation);
Message responseMessage = getNext().invoke(msg);
//set Cache-Control to no-cache to avoid intermediary
//proxy/reverse-proxy caches and always hit the server
//that would identify if the value was current or not
bindingContext.getHttpResponse().setHeader("Cache-Control", "no-cache");
bindingContext.getHttpResponse().setHeader("Expires", new Date(0).toGMTString());
String eTag = HTTPUtil.calculateHashETag(responseMessage.getBody().toString().getBytes("UTF-8"));
// Test request for predicates.
String predicate = bindingContext.getHttpRequest().getHeader( "If-Match" );
if (( predicate != null ) && ( !predicate.equals(eTag) )) {
// No match, should short circuit
bindingContext.getHttpResponse().sendError(HttpServletResponse.SC_PRECONDITION_FAILED);
}
predicate = bindingContext.getHttpRequest().getHeader( "If-None-Match" );
if (( predicate != null ) && ( predicate.equals(eTag) )) {
// Match, should short circuit
bindingContext.getHttpResponse().sendError(HttpServletResponse.SC_NOT_MODIFIED);
}
bindingContext.getHttpResponse().addHeader("ETag", eTag);
return responseMessage;
} catch (Exception e) {
throw new RuntimeException(e);
}
}
/**
* Find the operation from the component service contract
* @param componentService
* @param method
* @return
*/
private Operation findOperation(String method) {
if (method.contains(".")) {
method = method.substring(method.lastIndexOf(".") + 1);
}
List<Operation> operations = endpoint.getComponentServiceInterfaceContract().getInterface().getOperations();
Operation result = null;
for (Operation o : operations) {
if (o.getName().equalsIgnoreCase(method)) {
result = o;
break;
}
}
return result;
}
}
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