org.etudes.mneme.tool.GuestViewView.java Source code

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Here is the source code for org.etudes.mneme.tool.GuestViewView.java

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/**********************************************************************************
 * $URL$
 * $Id$
 ***********************************************************************************
 *
 * Copyright (c) 2008 Etudes, Inc.
 * 
 * Portions completed before September 1, 2008
 * Copyright (c) 2007, 2008 The Regents of the University of Michigan & Foothill College, ETUDES Project
 *
 * 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.etudes.mneme.tool;

import java.io.IOException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.etudes.ambrosia.api.Context;
import org.etudes.ambrosia.util.ControllerImpl;
import org.etudes.mneme.api.Assessment;
import org.etudes.mneme.api.AssessmentService;
import org.sakaiproject.tool.api.ToolManager;
import org.sakaiproject.util.StringUtil;
import org.sakaiproject.util.Web;

/**
 * The /guest_view view for the mneme tool.
 */
public class GuestViewView extends ControllerImpl {
    /** Our log. */
    private static Log M_log = LogFactory.getLog(GuestViewView.class);

    /** Assessment service. */
    protected AssessmentService assessmentService = null;

    /** tool manager reference. */
    protected ToolManager toolManager = null;

    /**
     * Shutdown.
     */
    public void destroy() {
        M_log.info("destroy()");
    }

    /**
     * {@inheritDoc}
     */
    public void get(HttpServletRequest req, HttpServletResponse res, Context context, String[] params)
            throws IOException {
        // we need an aid, then any number of parameters to form the return destination
        if (params.length < 3) {
            throw new IllegalArgumentException();
        }

        String assessmentId = params[2];

        String destination = null;
        if (params.length > 3) {
            destination = "/" + StringUtil.unsplit(params, 3, params.length - 3, "/");
        }

        // if not specified, go to the main guest page
        else {
            destination = "/guest_view";
        }

        Assessment assessment = this.assessmentService.getAssessment(assessmentId);
        if (assessment == null) {
            // redirect to error
            res.sendRedirect(res.encodeRedirectURL(Web.returnUrl(req, "/error/" + Errors.invalid)));
            return;
        }

        // security check
        if (!this.assessmentService.allowGuest(this.toolManager.getCurrentPlacement().getContext())) {
            // redirect to error
            res.sendRedirect(res.encodeRedirectURL(Web.returnUrl(req, "/error/" + Errors.unauthorized)));
            return;
        }

        context.put("assessment", assessment);
        context.put("return", destination);

        // render
        uiService.render(ui, context);
    }

    /**
     * Final initialization, once all dependencies are set.
     */
    public void init() {
        super.init();
        M_log.info("init()");
    }

    /**
     * {@inheritDoc}
     */
    public void post(HttpServletRequest req, HttpServletResponse res, Context context, String[] params)
            throws IOException {
        // we need an aid, then any number of parameters to form the return destination
        if (params.length < 2) {
            throw new IllegalArgumentException();
        }

        // read form
        String destination = this.uiService.decode(req, context);

        // go there!
        res.sendRedirect(res.encodeRedirectURL(Web.returnUrl(req, destination)));
    }

    /**
     * Set the assessment service.
     * 
     * @param service
     *        The assessment service.
     */
    public void setAssessmentService(AssessmentService service) {
        this.assessmentService = service;
    }

    /**
     * Set the tool manager.
     * 
     * @param manager
     *        The tool manager.
     */
    public void setToolManager(ToolManager manager) {
        toolManager = manager;
    }
}