001/*
002 * (C) Copyright 2006-2007 Nuxeo SAS (http://nuxeo.com/) and contributors.
003 *
004 * All rights reserved. This program and the accompanying materials
005 * are made available under the terms of the GNU Lesser General Public License
006 * (LGPL) version 2.1 which accompanies this distribution, and is available at
007 * http://www.gnu.org/licenses/lgpl.html
008 *
009 * This library is distributed in the hope that it will be useful,
010 * but WITHOUT ANY WARRANTY; without even the implied warranty of
011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012 * Lesser General Public License for more details.
013 *
014 * Contributors:
015 *     Nuxeo - initial API and implementation
016 *
017 * $Id: JOOoConvertPluginImpl.java 18651 2007-05-13 20:28:53Z sfermigier $
018 */
019
020package org.nuxeo.ecm.platform.ui.web.restAPI;
021
022import javax.faces.event.PhaseId;
023import javax.servlet.http.HttpServletRequest;
024
025import org.apache.commons.logging.Log;
026import org.apache.commons.logging.LogFactory;
027import org.jboss.seam.contexts.FacesLifecycle;
028import org.jboss.seam.contexts.Lifecycle;
029import org.jboss.seam.contexts.ServletLifecycle;
030import org.jboss.seam.core.ConversationPropagation;
031import org.jboss.seam.core.Manager;
032import org.jboss.seam.servlet.ServletRequestSessionMap;
033import org.jboss.seam.web.ServletContexts;
034import org.nuxeo.ecm.platform.ui.web.util.SeamComponentCallHelper;
035import org.nuxeo.runtime.transaction.TransactionHelper;
036import org.restlet.Filter;
037import org.restlet.Restlet;
038import org.restlet.data.MediaType;
039import org.restlet.data.Request;
040import org.restlet.data.Response;
041import org.restlet.data.Status;
042
043import com.noelios.restlet.ext.servlet.ServletCall;
044import com.noelios.restlet.http.HttpCall;
045import com.noelios.restlet.http.HttpRequest;
046
047/**
048 * Restlet Filter to initialized Seam context
049 *
050 * @author <a href="mailto:td@nuxeo.com">Thierry Delprat</a>
051 * @author Florent Guillaume
052 */
053public class SeamRestletFilter extends Filter {
054
055    private static final Log log = LogFactory.getLog(SeamRestletFilter.class);
056
057    private boolean useConversation = false;
058
059    public SeamRestletFilter() {
060        this(false);
061    }
062
063    public SeamRestletFilter(boolean needConversation) {
064        useConversation = needConversation;
065    }
066
067    @Override
068    protected void beforeHandle(Request request, Response response) {
069        FacesLifecycle.setPhaseId(PhaseId.INVOKE_APPLICATION);
070        if (useConversation && (request instanceof HttpRequest)) {
071            // Complete HTTP call with conversation
072            HttpCall httpCall = ((HttpRequest) request).getHttpCall();
073            if (httpCall instanceof ServletCall) {
074                HttpServletRequest httpServletRequest = ((ServletCall) httpCall).getRequest();
075
076                // see ContextualHttpServletRequest / SOAPRequestHandler
077                ServletLifecycle.beginRequest(httpServletRequest);
078                ServletContexts.instance().setRequest(httpServletRequest);
079                ConversationPropagation.instance().restoreConversationId(httpServletRequest.getParameterMap());
080                Manager.instance().restoreConversation();
081                ServletLifecycle.resumeConversation(httpServletRequest);
082                Manager.instance().handleConversationPropagation(httpServletRequest.getParameterMap());
083                return;
084            }
085        }
086        // Standard call without conversation
087        Lifecycle.beginCall();
088    }
089
090    @Override
091    protected void afterHandle(Request request, Response response) {
092        FacesLifecycle.setPhaseId(null);
093        if (useConversation && request instanceof HttpRequest) {
094            HttpCall httpCall = ((HttpRequest) request).getHttpCall();
095            if (httpCall instanceof ServletCall) {
096                if (TransactionHelper.isTransactionActive()) {
097                    // early commit of the transaction before releasing the
098                    // conversation lock to avoid a race condition on concurrent
099                    // access to the same documentManager instance by threads /
100                    // requests sharing the same conversation and triggering
101                    // StorageException "closed connection handle" on the RA
102                    // pool
103                    TransactionHelper.commitOrRollbackTransaction();
104                }
105                HttpServletRequest httpServletRequest = ((ServletCall) httpCall).getRequest();
106                // see ContextualHttpServletRequest / SOAPRequestHandler
107                Manager.instance().endRequest(new ServletRequestSessionMap(httpServletRequest));
108                ServletLifecycle.endRequest(httpServletRequest);
109                return;
110            }
111        }
112        Lifecycle.endCall();
113    }
114
115    @Override
116    protected void doHandle(Request request, Response response) {
117        if (getNext() != null) {
118            // get the Seam Wrapper from the instance
119            Restlet next = getNext();
120            Restlet seamRestlet = (Restlet) SeamComponentCallHelper.getSeamComponentByRef(next);
121            if (seamRestlet == null) {
122                final String errMsg = "Cannot get Seam component for restlet ";
123                log.error(errMsg + next);
124                response.setEntity(errMsg, MediaType.TEXT_PLAIN);
125            } else {
126                try {
127                    seamRestlet.handle(request, response);
128                } catch (RuntimeException e) {
129                    log.error("Restlet handling error", e);
130                    response.setEntity("Error while calling Seam aware Restlet: " + e.getMessage(),
131                            MediaType.TEXT_PLAIN);
132                }
133            }
134        } else {
135            response.setStatus(Status.CLIENT_ERROR_NOT_FOUND);
136        }
137    }
138
139}