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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.jsonp.runtime;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.util.Comparator;
import java.util.List;
import java.util.Set;
import java.util.SortedSet;
import java.util.TreeSet;
import javax.servlet.GenericServlet;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import org.apache.tuscany.sca.interfacedef.DataType;
import org.apache.tuscany.sca.interfacedef.Operation;
import org.apache.tuscany.sca.runtime.RuntimeEndpoint;
import org.codehaus.jackson.JsonParseException;
import org.codehaus.jackson.map.JsonMappingException;
import org.codehaus.jackson.map.ObjectMapper;
public class JSONPServlet extends GenericServlet {
private static final long serialVersionUID = 1L;
protected transient RuntimeEndpoint wire;
protected transient Operation operation;
protected transient ObjectMapper mapper;
public JSONPServlet(RuntimeEndpoint wire, Operation operation) {
this.wire = wire;
this.operation = operation;
this.mapper = new ObjectMapper();
}
@Override
public void service(ServletRequest servletRequest, ServletResponse servletResponse) throws ServletException, IOException {
String jsonRequest = getJSONRequest(servletRequest);
Object[] args = jsonToObjects(jsonRequest);
Object response = invokeService(args);
String jsonResponse = getJSONResponse(servletRequest, response);
servletResponse.getOutputStream().println(jsonResponse);
}
/**
* Turn the request into JSON
*/
protected String getJSONRequest(ServletRequest servletRequest) throws IOException, JsonParseException, JsonMappingException {
List<DataType> types = operation.getInputType().getLogical();
int typesIndex = 0;
String jsonRequest = "";
for (String name : getOrderedParameterNames(servletRequest)) {
if (!name.startsWith("_") && !"callback".equals(name)) {
if (jsonRequest.length() > 1) {
jsonRequest += ", ";
}
// automatically quote string parammeters so clients work in the usual javascript way
if (typesIndex < types.size() && String.class.equals(types.get(typesIndex).getGenericType())) {
String x = servletRequest.getParameter(name);
// TODO: do this more properly
if (!x.startsWith("\"")) {
jsonRequest += "\"" + x + "\"";
} else {
jsonRequest += x;
}
} else {
jsonRequest += servletRequest.getParameter(name);
}
}
}
return "[" + jsonRequest + "]";
}
/**
* Get the request parameter names in the correct order.
* The request args need to be in the correct order to invoke the service so work out the
* order from the order in the query string. Eg, the url:
* http://localhost:8085/HelloWorldService/sayHello2?first=petra&last=arnold&callback=foo"
* should invoke:
* sayHello2("petra", "arnold")
* so the parameter names should be ordered: "first", "last"
*/
protected SortedSet<String> getOrderedParameterNames(ServletRequest servletRequest) {
final String queryString = ((HttpServletRequest)servletRequest).getQueryString();
SortedSet<String> sortedNames = new TreeSet<String>(new Comparator<String>(){
public int compare(String o1, String o2) {
int i = queryString.indexOf(o1);
int j = queryString.indexOf(o2);
return i - j;
}});
Set<String> parameterNames = servletRequest.getParameterMap().keySet();
for (String name : parameterNames) {
sortedNames.add(name);
}
return sortedNames;
}
/**
* Turn the response object into JSON
*/
protected String getJSONResponse(ServletRequest servletRequest, Object response) throws IOException, JsonParseException {
ByteArrayOutputStream os = new ByteArrayOutputStream();
mapper.writeValue(os , response);
String jsonResponse = os.toString();
String callback = servletRequest.getParameter("callback");
if (callback != null && callback.length() > 1) {
jsonResponse = callback + "(" + jsonResponse + ");";
}
return jsonResponse;
}
/**
* Turn the request JSON into objects
*/
protected Object[] jsonToObjects(String jsonRequest) throws IOException, JsonParseException, JsonMappingException {
Class<?> c = new Object[0].getClass();
Object[] args = (Object[])mapper.readValue(jsonRequest, c);
return args;
}
/**
* Send the request down the wire to invoke the service
*/
protected Object invokeService(Object[] args) {
try {
return wire.invoke(operation, args);
} catch (InvocationTargetException e) {
throw new RuntimeException(e);
}
}
}
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