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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.wireformat.jsonrpc.provider;
+
+import org.apache.tuscany.sca.binding.http.HTTPBinding;
+import org.apache.tuscany.sca.binding.http.HTTPBindingContext;
+import org.apache.tuscany.sca.interfacedef.InterfaceContract;
+import org.apache.tuscany.sca.interfacedef.java.JavaInterface;
+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.invocation.MessageFactory;
+import org.apache.tuscany.sca.runtime.RuntimeWire;
+import org.json.JSONArray;
+import org.json.JSONObject;
+import org.osoa.sca.ServiceRuntimeException;
+
+import com.metaparadigm.jsonrpc.JSONRPCResult;
+
+/**
+ * JSON-RPC Wire Format Interceptor
+ *
+ * @version $Rev$ $Date$
+ */
+public class JSONRPCWireFormatInterceptor implements Interceptor {
+ private Invoker next;
+
+ private RuntimeWire runtimeWire;
+ private HTTPBinding binding;
+
+ private InterfaceContract serviceContract;
+
+ private MessageFactory messageFactory;
+
+ public JSONRPCWireFormatInterceptor(HTTPBinding binding, RuntimeWire runtimeWire, InterfaceContract serviceContract, MessageFactory messageFactory) {
+ this.binding = binding;
+ this.runtimeWire = runtimeWire;
+
+ this.serviceContract = serviceContract;
+
+ this.messageFactory = messageFactory;
+ }
+
+ public Invoker getNext() {
+ return next;
+ }
+
+ public void setNext(Invoker next) {
+ this.next = next;
+
+ }
+
+ public Message invoke(Message msg) {
+ HTTPBindingContext bindingContext = msg.getBindingContext();
+ Message returnMessage = null;
+
+ if ("smd".equals(bindingContext.getHttpRequest().getQueryString())) {
+ returnMessage = handleSMDInvocation(msg);
+ } else {
+ returnMessage = handleJSONRPCInvocation(msg);
+ }
+
+ return returnMessage;
+
+ }
+
+ /**
+ * Handle regular JSON-RPC Invocation
+ * @param msg
+ * @return
+ */
+ private Message handleJSONRPCInvocation (Message msg) {
+ JSONObject jsonReq = (JSONObject) msg.getBody();
+ String method = null;
+ Object[] args = null;
+ Object id = null;
+ try {
+ // Extract the method
+ method = jsonReq.getString("method");
+ if ((method != null) && (method.indexOf('.') < 0)) {
+ jsonReq.putOpt("method", "Service" + "." + method);
+ }
+
+ // Extract the arguments
+ JSONArray array = jsonReq.getJSONArray("params");
+ args = new Object[array.length()];
+ for (int i = 0; i < args.length; i++) {
+ args[i] = array.get(i);
+ }
+ id = jsonReq.get("id");
+
+ } catch (Exception e) {
+ throw new RuntimeException("Unable to find json method name", e);
+ }
+
+ Message responseMessage = null;
+ try {
+ msg.setBody(args);
+ responseMessage = runtimeWire.getInvocationChain(msg.getOperation()).getHeadInvoker().invoke(msg);
+ } catch (RuntimeException re) {
+ Throwable exception = new RuntimeException("Error invoking service :" + re.getMessage(), re);
+ return createJSONFaultMessage(re);
+ }
+
+ Object result = null;
+ if (!responseMessage.isFault()) {
+ //successful execution of the invocation
+ try {
+ result = responseMessage.getBody();
+ JSONObject jsonResponse = new JSONObject();
+ jsonResponse.put("result", result);
+ jsonResponse.putOpt("id", id);
+ //get response to send to client
+ responseMessage.setBody(jsonResponse);
+ return responseMessage;
+ } catch (Exception e) {
+ throw new ServiceRuntimeException("Unable to create JSON response", e);
+ }
+ } else {
+ //exception thrown while executing the invocation
+ Throwable exception = (Throwable)responseMessage.getBody();
+ return createJSONFaultMessage(exception);
+ }
+ }
+
+ /**
+ * handles requests for the SMD descriptor for a service
+ */
+ private Message handleSMDInvocation(Message msg) {
+ HTTPBindingContext bindingContext = msg.getBindingContext();
+
+ String serviceUrl = bindingContext.getHttpRequest().getRequestURL().toString();
+ JavaInterface interfaze = (JavaInterface) serviceContract.getInterface();
+ String smd = JavaToSmd.interfaceToSmd(interfaze.getJavaClass(), serviceUrl);
+
+ Message smdResponseMessage = messageFactory.createMessage();
+ smdResponseMessage.setBody(smd);
+
+ return smdResponseMessage;
+ }
+
+ /**
+ * Create a Fault Message with a JSON representation of the current exception
+ * @param throwable
+ * @return
+ */
+ private Message createJSONFaultMessage(Throwable throwable) {
+ Message jsonFaultMessage = messageFactory.createMessage();
+
+ JSONRPCResult jsonFault = new JSONRPCResult(JSONRPCResult.CODE_REMOTE_EXCEPTION, null, throwable);
+ jsonFaultMessage.setBody(jsonFault);
+
+ return jsonFaultMessage;
+ }
+}