package org.javacommerce.google.servlet;
import java.io.IOException;
import java.io.StringWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.exolab.castor.xml.MarshalException;
import org.exolab.castor.xml.Marshaller;
import org.exolab.castor.xml.ValidationException;
import org.javacommerce.google.handler.HandlerException;
import org.javacommerce.google.handler.HandlerFactory;
import org.javacommerce.google.ws.API;
import org.jdom.Document;
import org.jdom.JDOMException;
import org.jdom.input.SAXBuilder;
import com.google.checkout.NotificationAcknowledgment;
/**
*
* @author Michael Blanton (mike@mikeblanton.com)
* @web.servlet name="Callback"
* @web.servlet-mapping
* url-pattern="/Callback"
*/
public class CallbackServlet extends HttpServlet {
private static final Log LOG = LogFactory.getLog(CallbackServlet.class);
/**
*
*/
private static final long serialVersionUID = 4557328827383959815L;
private static String NOTIFICATION_ACK;
/* (non-Javadoc)
* @see javax.servlet.http.HttpServlet#doPost(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
*/
protected void doPost(HttpServletRequest _request, HttpServletResponse _response) throws ServletException, IOException {
// Validate the Authorization header
String authorization = _request.getHeader("Authorization");
if (authorization == null || !authorization.equals(API.getAuthorizationHeader())) {
if (LOG.isErrorEnabled()) {
LOG.error("Unauthorized access attempt from [" + _request.getRemoteAddr() + "].");
}
_response.setStatus(HttpStatus.SC_UNAUTHORIZED);
return;
}
try {
// Authorization matches, grab the request
SAXBuilder builder = new SAXBuilder();
Document xmlDoc = builder.build(_request.getReader());
HandlerFactory.getNotificationHandler(xmlDoc).handleMessage(xmlDoc);
_response.addHeader("Content-Type", "application/xml");
_response.addHeader("Accepts", "application/xml");
_response.getWriter().write(NOTIFICATION_ACK);
_response.setStatus(HttpStatus.SC_OK);
} catch (JDOMException e) {
if (LOG.isErrorEnabled()) {
LOG.error("JDOMException processing Google Callback: " + e.getLocalizedMessage(), e);
}
_response.setStatus(HttpStatus.SC_INTERNAL_SERVER_ERROR);
} catch (IOException e) {
if (LOG.isErrorEnabled()) {
LOG.error("IOException processing Google Callback: " + e.getLocalizedMessage(), e);
}
_response.setStatus(HttpStatus.SC_INTERNAL_SERVER_ERROR);
} catch (HandlerException e) {
if (LOG.isErrorEnabled()) {
LOG.error("IOException processing Google Callback: " + e.getLocalizedMessage(), e);
}
_response.setStatus(HttpStatus.SC_INTERNAL_SERVER_ERROR);
} catch (InstantiationException e) {
if (LOG.isErrorEnabled()) {
LOG.error("InstantiationException processing Google Callback: " + e.getLocalizedMessage(), e);
}
_response.setStatus(HttpStatus.SC_INTERNAL_SERVER_ERROR);
} catch (IllegalAccessException e) {
if (LOG.isErrorEnabled()) {
LOG.error("IllegalAccessException processing Google Callback: " + e.getLocalizedMessage(), e);
}
_response.setStatus(HttpStatus.SC_INTERNAL_SERVER_ERROR);
} catch (ClassNotFoundException e) {
if (LOG.isErrorEnabled()) {
LOG.error("ClassNotFoundException processing Google Callback: " + e.getLocalizedMessage(), e);
}
_response.setStatus(HttpStatus.SC_INTERNAL_SERVER_ERROR);
}
}
/* (non-Javadoc)
* @see javax.servlet.GenericServlet#init()
*/
public void init() throws ServletException {
super.init();
try {
StringWriter writer= new StringWriter();
Marshaller.marshal(new NotificationAcknowledgment(), writer);
NOTIFICATION_ACK = writer.toString();
} catch (MarshalException e) {
if (LOG.isFatalEnabled()) {
LOG.fatal("MarshalException caught while initializing servlet: " + e.getLocalizedMessage(), e);
}
throw new ServletException(e.getLocalizedMessage(), e);
} catch (ValidationException e) {
if (LOG.isFatalEnabled()) {
LOG.fatal("ValidationException caught while initializing servlet: " + e.getLocalizedMessage(), e);
}
throw new ServletException(e.getLocalizedMessage(), e);
}
}
}