001/*
002 * (C) Copyright 2006-2016 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 *
016 * Contributors:
017 *     Nuxeo - initial API and implementation
018 */
019package org.nuxeo.ecm.platform.web.common.exceptionhandling;
020
021import java.io.IOException;
022
023import javax.servlet.Filter;
024import javax.servlet.FilterChain;
025import javax.servlet.FilterConfig;
026import javax.servlet.ServletException;
027import javax.servlet.ServletRequest;
028import javax.servlet.ServletResponse;
029import javax.servlet.http.HttpServletRequest;
030import javax.servlet.http.HttpServletResponse;
031
032import org.apache.commons.logging.Log;
033import org.apache.commons.logging.LogFactory;
034import org.nuxeo.ecm.platform.web.common.exceptionhandling.service.ExceptionHandlingService;
035import org.nuxeo.runtime.api.Framework;
036
037public class NuxeoExceptionFilter implements Filter {
038
039    private NuxeoExceptionHandler exceptionHandler;
040
041    private static final Log log = LogFactory.getLog(NuxeoExceptionFilter.class);
042
043    public void init(FilterConfig filterConfig) throws ServletException {
044        try {
045            getHandler();
046        } catch (ServletException e) {
047            log.info("NuxeoExceptionHandler will be lazy loaded");
048        }
049    }
050
051    protected NuxeoExceptionHandler getHandler() throws ServletException {
052        if (exceptionHandler == null) {
053            ExceptionHandlingService service = Framework.getService(ExceptionHandlingService.class);
054            exceptionHandler = service.getExceptionHandler();
055        }
056        return exceptionHandler;
057    }
058
059    private void handleException(HttpServletRequest request, HttpServletResponse response, Exception e)
060            throws IOException, ServletException {
061        getHandler().handleException(request, response, e);
062    }
063
064    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
065            throws IOException, ServletException {
066        try {
067            chain.doFilter(request, response);
068        } catch (RuntimeException | IOException | ServletException e) {
069            try {
070                handleException((HttpServletRequest) request, (HttpServletResponse) response, e);
071            } catch (ServletException ee) {
072                throw ee;
073            } catch (RuntimeException | IOException ee) {
074                throw new ServletException(ee);
075            }
076        }
077    }
078
079    public void destroy() {
080    }
081
082}