/*
Copyright (c) 2010, Geomatics and Cartographic Research Centre, Carleton
University
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
- Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
- Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
- Neither the name of the Geomatics and Cartographic Research Centre,
Carleton University nor the names of its contributors may be used to
endorse or promote products derived from this software without specific
prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
$Id$
*/
package ca.carleton.gcrc.contributions;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.sql.Connection;
import java.util.Date;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import net.sf.json.JSONObject;
import org.apache.log4j.Logger;
import ca.carleton.gcrc.auth.common.UserRepository;
import ca.carleton.gcrc.auth.common.UserRepositoryDb;
import ca.carleton.gcrc.jdbc.JdbcConnections;
public class ContributionServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
final protected Logger logger = Logger.getLogger(this.getClass());
private JdbcConnections connections = null;
private Connection connection = null;
private Contributions contributions;
private UserRepository userRepository;
public ContributionServlet() {
}
public void init(ServletConfig config) throws ServletException {
super.init(config);
try {
connections = JdbcConnections.connectionsFromServletContext(config.getServletContext());
connection = connections.getDb();
} catch (Exception e) {
throw new ServletException("Error while connecting to database",e);
}
try {
userRepository = new UserRepositoryDb(config.getServletContext());
} catch (Exception e) {
throw new ServletException("Error while connecting to user repository",e);
}
contributions = ContributionsUtils.createContibutionHandler(config, connection);
if (null == contributions) {
return;
}
try {
ContributionComet contComet = new ContributionCometImpl(config);
contributions.setContributionComet( contComet );
} catch(Exception e) {
logger.error("Comet not available for contributions", e);
}
}
public void destroy() {
connections.closeAllConnections();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request, response);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String paths[] = request.getRequestURI().split("/");
String path = paths[ paths.length - 1 ];
logger.info(this.getClass().getName()+" "+path);
try {
if( "delete".equalsIgnoreCase(path) ) {
performDelete(request, response);
} else if( "fromName".equalsIgnoreCase(path) ) {
performFromName(request, response);
} else {
throw new Exception("Unknown request: "+path);
}
} catch(Exception e) {
logger.info("Error in Contribution Servlet",e);
sendErrorResponse(response, e);
}
}
protected void performDelete(HttpServletRequest request, HttpServletResponse response) throws Exception {
String[] ids = request.getParameterValues("id");
String[] placeIds = request.getParameterValues("placeId");
if( null == ids || ids.length < 1 ) {
throw new Exception("Parameter 'id' not provided");
}
if( ids.length > 1 ) {
throw new Exception("Parameter 'id' provided multiple times");
}
if( null == placeIds ) {
placeIds = new String[0];
}
if( placeIds.length > 1 ) {
throw new Exception("Parameter 'place_id' provided multiple times");
}
contributions.deleteContribution(ids[0], (placeIds.length > 0 ? placeIds[0] : null));
JSONObject result = new JSONObject();
result.put("id", ids[0]);
if( placeIds.length > 0 ) {
result.put("place_id", placeIds[0]);
}
sendJsonResponse(response, result);
}
protected void performFromName(HttpServletRequest request, HttpServletResponse response) throws Exception {
String[] names = request.getParameterValues("name");
if( null == names || names.length < 1 ) {
throw new Exception("Parameter 'name' not provided");
}
if( names.length > 1 ) {
throw new Exception("Parameter 'name' provided multiple times");
}
if (null != contributions) {
JSONObject result = contributions.fromName(names[0], userRepository);
sendJsonResponse(response, result);
} else {
throw new Exception("Contribution record access requests can not be fulfill because of failed initialization - look for earlier exceptions.");
}
}
protected void sendJsonResponse(HttpServletResponse response, JSONObject result) throws ServletException, IOException {
response.setStatus(HttpServletResponse.SC_OK);
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", (new Date()).getTime());
response.setContentType("text/plain");
response.setCharacterEncoding("utf-8");
OutputStreamWriter osw = new OutputStreamWriter( response.getOutputStream(), "UTF-8" );
result.write(osw);
osw.flush();
}
protected void sendErrorResponse(HttpServletResponse response, Throwable error) throws ServletException, IOException {
response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", (new Date()).getTime());
response.setContentType("text/plain");
response.setCharacterEncoding("utf-8");
JSONObject result = new JSONObject();
result.put("error", errorToJson(error));
OutputStreamWriter osw = new OutputStreamWriter( response.getOutputStream(), "UTF-8" );
result.write(osw);
osw.flush();
}
protected JSONObject errorToJson(Throwable error) throws ServletException, IOException {
JSONObject errorObj = new JSONObject();
errorObj.put("message", error.getMessage());
if( null != error.getCause() ) {
errorObj.put("cause", errorToJson(error.getCause()));
}
return errorObj;
}
}