org.theospi.portfolio.shared.control.ContentResourceUriResolver.java Source code

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Here is the source code for org.theospi.portfolio.shared.control.ContentResourceUriResolver.java

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/**********************************************************************************
* $URL: https://source.sakaiproject.org/svn/osp/trunk/common/tool-lib/src/java/org/theospi/portfolio/shared/control/ContentResourceUriResolver.java $
* $Id: ContentResourceUriResolver.java 105079 2012-02-24 23:08:11Z ottenhoff@longsight.com $
***********************************************************************************
*
 * Copyright (c) 2005, 2006, 2008 The Sakai Foundation
 *
 * Licensed under the Educational Community 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.opensource.org/licenses/ECL-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.theospi.portfolio.shared.control;

import java.io.IOException;
import java.net.MalformedURLException;

import javax.xml.transform.Source;
import javax.xml.transform.TransformerException;
import javax.xml.transform.URIResolver;
import javax.xml.transform.sax.SAXSource;
import javax.xml.transform.stream.StreamSource;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.xml.resolver.tools.CatalogResolver;
import org.sakaiproject.component.api.ServerConfigurationService;
import org.sakaiproject.content.api.ContentResource;
import org.sakaiproject.entity.api.EntityManager;
import org.sakaiproject.entity.api.Reference;
import org.sakaiproject.exception.ServerOverloadException;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.XMLReaderFactory;

public class ContentResourceUriResolver implements URIResolver {

    private EntityManager entityManager;
    private ServerConfigurationService serverConfigurationService;

    protected final Log logger = LogFactory.getLog(getClass());

    public Source resolve(String href, String base) throws TransformerException {
        try {
            String accessUrl = getServerConfigurationService().getAccessUrl();
            String url = href.replaceAll(accessUrl, "");

            // We depend on these resolving as content entities (e.g., /content/group/<site> or /content/user/<user>),
            // so provide some assistance and consistency with metaobj resolution.

            // Check if this already resolves as a content entity and, if not, try again by prepending /content/.
            Reference ref = getEntityManager().newReference(url);
            Object entity = ref.getEntity();
            if (entity == null || !(entity instanceof ContentResource)) {
                if (!url.startsWith("/content/")) {
                    url = "/content" + (url.startsWith("/") ? "" : "/") + url;
                    ref = getEntityManager().newReference(url);
                    entity = ref.getEntity();
                }
                if (entity == null || !(entity instanceof ContentResource)) {
                    String msg = "Could not resolve URI as a content resource: " + href;
                    logger.info(msg);
                    throw new TransformerException(msg);
                }
            }

            ContentResource res = (ContentResource) entity;
            StreamSource strs = new StreamSource(res.streamContent());
            SAXSource ss = new SAXSource(new InputSource(strs.getInputStream()));
            CatalogResolver resolver = new CatalogResolver();
            String appUrl = getServerConfigurationService().getServerUrl();
            try {
                resolver.getCatalog().parseCatalog(appUrl + "/osp-common-tool/dtd/catalog.xml");
                XMLReader xread = XMLReaderFactory.createXMLReader();
                xread.setEntityResolver(resolver);
                ss.setXMLReader(xread);
            } catch (MalformedURLException e) {
                logger.error(e);
            } catch (IOException e) {
                logger.error(e);
            } catch (SAXException e) {
                logger.error(e);
            }

            return ss;
        } catch (ServerOverloadException e) {
            logger.error("", e);
        }
        return null;
    }

    public EntityManager getEntityManager() {
        return entityManager;
    }

    public void setEntityManager(EntityManager entityManager) {
        this.entityManager = entityManager;
    }

    public ServerConfigurationService getServerConfigurationService() {
        return serverConfigurationService;
    }

    public void setServerConfigurationService(ServerConfigurationService serverConfigurationService) {
        this.serverConfigurationService = serverConfigurationService;
    }

}