src/java/org/apache/lenya/cms/cocoon/components/modules/input/ProxyUrlModule.java

/*
 * Copyright  1999-2004 The Apache Software Foundation
 *
 *  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.apache.lenya.cms.cocoon.components.modules.input;

import java.util.Collections;
import java.util.Iterator;
import java.util.Map;

import org.apache.avalon.framework.configuration.Configuration;
import org.apache.avalon.framework.configuration.ConfigurationException;
import org.apache.avalon.framework.service.ServiceSelector;
import org.apache.cocoon.environment.ObjectModelHelper;
import org.apache.cocoon.environment.Request;
import org.apache.lenya.ac.AccessController;
import org.apache.lenya.ac.AccessControllerResolver;
import org.apache.lenya.ac.AccreditableManager;
import org.apache.lenya.ac.Authorizer;
import org.apache.lenya.ac.Policy;
import org.apache.lenya.ac.PolicyManager;
import org.apache.lenya.ac.impl.DefaultAccessController;
import org.apache.lenya.ac.impl.PolicyAuthorizer;
import org.apache.lenya.cms.proxy.Proxy;
import org.apache.lenya.cms.repo.Document;
import org.apache.lenya.cms.repo.Publication;
import org.apache.lenya.cms.repo.impl.RepositoryUtil;
import org.apache.lenya.util.ServletHelper;

/**
 * Input module for getting the proxied URL of a document.
 * 
 * <p>
 * Usage: <code>{proxy-url:{area}:{document-id}:{language}}</code>
 * </p>
 * 
 * <p>
 * If there are no proxy settings in the file conf/publication.xconf, the values of the request
 * parameters 'server name' and 'port' will be used to construct the URL.
 * </p>
 * 
 * @version $Id:$
 */
public class ProxyUrlModule extends AbstractServiceableInputModule {

    /**
     * @see org.apache.cocoon.components.modules.input.InputModule#getAttribute(java.lang.String,
     *      org.apache.avalon.framework.configuration.Configuration, java.util.Map)
     */
    public Object getAttribute(String name, Configuration modeConf, Map objectModel)
            throws ConfigurationException {

        ServiceSelector serviceSelector = null;
        PolicyManager policyManager = null;
        AccessControllerResolver acResolver = null;
        AccreditableManager accreditableManager = null;

        // Get parameters
        final String[] attributes = name.split(":");

        if (attributes.length < 3) {
            throw new ConfigurationException("Invalid number of parameters: " + attributes.length
                    + ". Expected area, document-id, language.");
        }

        final String area = attributes[0];
        final String documentId = attributes[1];
        final String language = attributes[2];

        String value = null;
        try {
            Request request = ObjectModelHelper.getRequest(objectModel);
            Publication publication = RepositoryUtil.getPublication(this.manager,
                    request,
                    getLogger());

            Document doc = publication.getArea(area)
                    .getContent()
                    .getNode(documentId)
                    .getDocument(language);

            // Get proxy for document
            serviceSelector = (ServiceSelector) this.manager.lookup(AccessControllerResolver.ROLE
                    + "Selector");
            acResolver = (AccessControllerResolver) serviceSelector.select(AccessControllerResolver.DEFAULT_RESOLVER);

            String url = ServletHelper.getWebappURI(request);
            AccessController accessController = acResolver.resolveAccessController(url);
            if (accessController instanceof DefaultAccessController) {
                DefaultAccessController defaultAccessController = (DefaultAccessController) accessController;
                accreditableManager = defaultAccessController.getAccreditableManager();
                Authorizer[] authorizers = defaultAccessController.getAuthorizers();
                for (int i = 0; i < authorizers.length; i++) {
                    if (authorizers[i] instanceof PolicyAuthorizer) {
                        PolicyAuthorizer policyAuthorizer = (PolicyAuthorizer) authorizers[i];
                        policyManager = policyAuthorizer.getPolicyManager();
                    }
                }
            }

            Policy policy = policyManager.getPolicy(accreditableManager, url);

            Proxy proxy = publication.getProxy(doc, policy.isSSLProtected());

            if (proxy != null) {
                value = proxy.getURL(doc);
            } else {
                // Take server name and port from request.
                value = "http://" + request.getServerName() + ":" + request.getServerPort()
                        + request.getContextPath() + url;
            }

        } catch (Exception e) {
            throw new ConfigurationException("Obtaining value for [" + name + "] failed: ", e);
        }
        return value;
    }

    /**
     * @see org.apache.cocoon.components.modules.input.InputModule#getAttributeNames(org.apache.avalon.framework.configuration.Configuration,
     *      java.util.Map)
     */
    public Iterator getAttributeNames(Configuration modeConf, Map objectModel)
            throws ConfigurationException {
        return Collections.EMPTY_SET.iterator();
    }

    /**
     * @see org.apache.cocoon.components.modules.input.InputModule#getAttributeValues(java.lang.String,
     *      org.apache.avalon.framework.configuration.Configuration, java.util.Map)
     */
    public Object[] getAttributeValues(String name, Configuration modeConf, Map objectModel)
            throws ConfigurationException {
        Object[] objects = { getAttribute(name, modeConf, objectModel) };
        return objects;
    }

}