/*
* Copyright (C) 2015 Red Hat, Inc. and/or its affiliates.
*
* Licensed 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.jboss.errai.bus.server;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* A filter that can be configured to respond to all requests with a given error
* code. This can be used to simulates a variety of server-side conditions that
* will lead the client-side bus to try to reconnect.
* <p>
* There are two ways to change the filter's behaviour:
* <ol>
* <li>On the server, just set the static {@link #errorCode} field to a
* non-zero value (for example, try 401, 404, or 500).
* <li>From the client, send a GET request that this filter will intercept with a parameter called
* "errorCode". For example, this filter is normally mapped to {@code *.erraiBus} so
* {@code GET /myapp/errorSimulator.erraiBus?errorCode=401} should work.
* </ol>
*
* @author jfuerth
*/
public class ServerSideErrorSimulationFilter implements Filter {
/**
* If this field is set to a non-zero value, this filter will respond to all
* requests with that HTTP status. When this field has a 0 value, the filter
* has no effect.
*/
public static volatile int errorCode = 0;
@Override
public void init(FilterConfig filterConfig) throws ServletException {
// no op
}
@Override
public void destroy() {
// no op
}
@Override
public void doFilter(ServletRequest req, ServletResponse resp,
FilterChain chain) throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) req;
HttpServletResponse response = (HttpServletResponse) resp;
final int errorCode = ServerSideErrorSimulationFilter.errorCode;
if (request.getParameter("errorCode") != null) {
ServerSideErrorSimulationFilter.errorCode = Integer.parseInt(request.getParameter("errorCode"));
}
else if (errorCode != 0) {
((HttpServletResponse) response).sendError(errorCode);
}
else {
chain.doFilter(request, response);
}
}
}