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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.jsonrpc;
import java.io.BufferedReader;
import java.io.CharArrayWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.text.ParseException;
import javax.servlet.ServletConfig;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.json.JSONObject;
import com.metaparadigm.jsonrpc.JSONRPCBridge;
import com.metaparadigm.jsonrpc.JSONRPCResult;
import com.metaparadigm.jsonrpc.JSONRPCServlet;
/**
* Servlet that handles JSON-RPC requests invoking SCA services.
*
* There is an instance of this servlet for each <binding.jsonrpc>
*/
public class JSONRPCServiceServlet extends JSONRPCServlet {
private static final long serialVersionUID = 1L;
transient String serviceName;
transient Object serviceInstance;
transient Class<?> serviceInterface;
public JSONRPCServiceServlet(String serviceName, Class<?> serviceInterface, Object serviceInstance) {
this.serviceName = serviceName;
this.serviceInterface = serviceInterface;
this.serviceInstance = serviceInstance;
}
/**
* Override to do nothing as the JSONRPCServlet is setup by the
* service method in this class.
*/
@Override
public void init(ServletConfig config) {
}
@Override
public void service(HttpServletRequest request, HttpServletResponse response) throws IOException {
if (request.getParameter("smd") != null) {
handleSMDRequest(request, response);
} else {
try {
handleServiceRequest(request, response);
} finally {
HttpSession session = request.getSession();
if (session != null) {
session.removeAttribute("JSONRPCBridge");
}
}
}
}
private void handleServiceRequest(HttpServletRequest request, HttpServletResponse response) throws IOException {
/*
* Create a new bridge for every request to aviod all the problems with
* JSON-RPC-Java storing the bridge in the session
*/
HttpSession session = request.getSession();
JSONRPCBridge jsonrpcBridge = new JSONRPCBridge();
jsonrpcBridge.registerObject(serviceName, serviceInstance, serviceInterface);
session.setAttribute("JSONRPCBridge", jsonrpcBridge);
// Encode using UTF-8, although We are actually ASCII clean as
// all unicode data is JSON escaped using backslash u. This is
// less data efficient for foreign character sets but it is
// needed to support naughty browsers such as Konqueror and Safari
// which do not honour the charset set in the response
response.setContentType("text/plain;charset=utf-8");
OutputStream out = response.getOutputStream();
// Decode using the charset in the request if it exists otherwise
// use UTF-8 as this is what all browser implementations use.
// The JSON-RPC-Java JavaScript client is ASCII clean so it
// although here we can correctly handle data from other clients
// that do not escape non ASCII data
String charset = request.getCharacterEncoding();
if (charset == null) {
charset = "UTF-8";
}
BufferedReader in = new BufferedReader(new InputStreamReader(request.getInputStream(), charset));
// Read the request
CharArrayWriter data = new CharArrayWriter();
char buf[] = new char[4096];
int ret;
while ((ret = in.read(buf, 0, 4096)) != -1) {
data.write(buf, 0, ret);
}
JSONObject jsonReq = null;
JSONRPCResult jsonResp = null;
try {
jsonReq = new JSONObject(data.toString());
} catch (ParseException e) {
throw new RuntimeException("Unable to parse request", e);
}
String method = jsonReq.getString("method");
if ((method != null) && (method.indexOf('.') < 0)) {
jsonReq.putOpt("method", serviceName + "." + method);
}
// invoke the request
jsonResp = jsonrpcBridge.call(new Object[] {request}, jsonReq);
byte[] bout = jsonResp.toString().getBytes("UTF-8");
out.write(bout);
out.flush();
out.close();
}
/**
* handles requests for the SMD descriptor for a service
*/
protected void handleSMDRequest(HttpServletRequest request, HttpServletResponse response) throws IOException, UnsupportedEncodingException {
String serviceUrl = request.getRequestURL().toString();
String smd = JavaToSmd.interfaceToSmd(serviceInterface, serviceUrl);
response.setContentType("text/plain;charset=utf-8");
OutputStream out = response.getOutputStream();
byte[] bout = smd.getBytes("UTF-8");
out.write(bout);
out.flush();
out.close();
}
}
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