001/*
002 * (C) Copyright 2013 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 *     Arnaud Kervern
018 */
019
020package org.nuxeo.ecm.platform.web.common.requestcontroller.filter;
021
022import java.io.IOException;
023import javax.servlet.FilterChain;
024import javax.servlet.FilterConfig;
025import javax.servlet.ServletException;
026import javax.servlet.ServletRequest;
027import javax.servlet.ServletResponse;
028import javax.servlet.http.HttpServletRequest;
029import org.nuxeo.ecm.platform.web.common.requestcontroller.service.RequestControllerManager;
030import org.nuxeo.runtime.api.Framework;
031import com.thetransactioncompany.cors.CORSFilter;
032
033/**
034 * Nuxeo CORS filter wrapper to com.thetransactioncompany.cors.CORSFilter allowing to configure cors filter depending of
035 * the request url. Each time a request matchs a contribution is found, CORSFilter had to be re-initialized to change
036 * his configurations.
037 * 
038 * @author <a href="mailto:ak@nuxeo.com">Arnaud Kervern</a>
039 * @since 5.7.2
040 */
041public class NuxeoCorsFilter extends CORSFilter {
042
043    @Override
044    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException,
045            ServletException {
046        FilterConfig filterConfig = getFilterConfigFrom(request);
047        if (filterConfig != null) {
048            super.init(filterConfig);
049            super.doFilter(request, response, chain);
050        } else {
051            chain.doFilter(request, response);
052        }
053    }
054
055    protected FilterConfig getFilterConfigFrom(ServletRequest request) {
056        if (!(request instanceof HttpServletRequest)) {
057            return null;
058        }
059        return Framework.getLocalService(RequestControllerManager.class).getCorsConfigForRequest(
060                (HttpServletRequest) request);
061    }
062}