package com.epam.wilma.webapp.config.servlet.service;
/*==========================================================================
Copyright 2013-2017 EPAM Systems
This file is part of Wilma.
Wilma is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Wilma is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Wilma. If not, see <http://www.gnu.org/licenses/>.
===========================================================================*/
import com.epam.wilma.common.helper.UniqueIdGenerator;
import com.epam.wilma.webapp.service.external.ServiceMap;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
/**
* Servlet class for providing extra services for wilma-service-api.
*
* @author Tamas_Kohegyi
*/
@Component
public class ServiceServlet extends HttpServlet {
private static final String LEADING_TEXT = "/public/services/";
private final Logger logger = LoggerFactory.getLogger(ServiceServlet.class);
@Autowired
private ServiceMap serviceMap;
@Override
protected void doGet(final HttpServletRequest req, final HttpServletResponse resp) throws ServletException, IOException {
//first identify the requested service
String requestUri = req.getRequestURI();
logger.info("Service call to: " + requestUri + ", method: " + req.getMethod());
int positionOfLeadingText = requestUri.indexOf(LEADING_TEXT);
int requestedServicePosition = positionOfLeadingText + LEADING_TEXT.length();
String requestedService = positionOfLeadingText >= 0 ? requestUri.substring(requestedServicePosition) : "";
//set the default answer
resp.setContentType("application/json");
resp.setStatus(HttpServletResponse.SC_NOT_FOUND);
String response = null;
//call the built-in service, as necessary - later should be part of the registered services !!!
if ("UniqueIdGenerator/uniqueId".equalsIgnoreCase(requestedService) && "get".equalsIgnoreCase(req.getMethod())) {
// get a new unique id
response = getUniqueId();
resp.setStatus(HttpServletResponse.SC_OK);
}
//call further registered services
if (response == null) {
response = serviceMap.callExternalService(req, requestedService, resp);
}
//if we still don't have the response, then either provide the service map, or send back that it is unknown request
if (response == null) {
if (requestedService.length() > 0) {
response = "{ \"unknownServiceCall\": \"" + req.getMethod() + " " + requestedService + "\" }";
} else {
//call the built-in listing service (service-map)
response = serviceMap.getMapAsResponse();
resp.setStatus(HttpServletResponse.SC_OK);
}
}
//write the answer back
PrintWriter out = resp.getWriter();
out.write(response);
out.flush();
out.close();
}
@Override
protected void doPost(final HttpServletRequest req, final HttpServletResponse resp) throws ServletException, IOException {
doGet(req, resp);
}
@Override
protected void doPut(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doGet(req, resp);
}
@Override
protected void doDelete(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doGet(req, resp);
}
private String getUniqueId() {
long nextUniqueId = UniqueIdGenerator.getNextUniqueId();
return "{ \"uniqueId\": \"" + nextUniqueId + "\" }";
}
}