SuppressRequestRejectedExceptionFilter.java

/*
 * Copyright 2019 Global Crop Diversity Trust
 *
 * 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.genesys.server.servlet.filter;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.security.web.firewall.RequestRejectedException;
import org.springframework.web.filter.GenericFilterBean;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * https://stackoverflow.com/questions/51788764/how-to-intercept-a-requestrejectedexception-in-spring/52635656#52635656
 */
public class SuppressRequestRejectedExceptionFilter extends GenericFilterBean {
    private static final Logger LOG = LoggerFactory.getLogger(SuppressRequestRejectedExceptionFilter.class);

    @Override
    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
        try {
            chain.doFilter(req, res);
        } catch (RequestRejectedException e) {
            HttpServletRequest request = (HttpServletRequest) req;
            HttpServletResponse response = (HttpServletResponse) res;
            LOG.warn("Bad request {} {}: {}", request.getMethod(), request.getRequestURL(), e.getMessage());
            response.sendError(HttpServletResponse.SC_NOT_FOUND);
        }
    }
}