de.tuclausthal.submissioninterface.servlets.controller.DeleteFile.java Source code

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Here is the source code for de.tuclausthal.submissioninterface.servlets.controller.DeleteFile.java

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/*
 * Copyright 2009 - 2010 Sven Strickroth <email@cs-ware.de>
 * 
 * This file is part of the SubmissionInterface.
 * 
 * SubmissionInterface is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 3 as
 * published by the Free Software Foundation.
 * 
 * SubmissionInterface is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with SubmissionInterface. If not, see <http://www.gnu.org/licenses/>.
 */

package de.tuclausthal.submissioninterface.servlets.controller;

import java.io.File;
import java.io.IOException;
import java.util.Date;

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

import org.hibernate.LockMode;
import org.hibernate.Session;
import org.hibernate.Transaction;

import de.tuclausthal.submissioninterface.persistence.dao.DAOFactory;
import de.tuclausthal.submissioninterface.persistence.dao.ParticipationDAOIf;
import de.tuclausthal.submissioninterface.persistence.dao.SubmissionDAOIf;
import de.tuclausthal.submissioninterface.persistence.dao.impl.LogDAO;
import de.tuclausthal.submissioninterface.persistence.datamodel.Participation;
import de.tuclausthal.submissioninterface.persistence.datamodel.Submission;
import de.tuclausthal.submissioninterface.persistence.datamodel.Task;
import de.tuclausthal.submissioninterface.persistence.datamodel.LogEntry.LogAction;
import de.tuclausthal.submissioninterface.servlets.RequestAdapter;
import de.tuclausthal.submissioninterface.util.ContextAdapter;
import de.tuclausthal.submissioninterface.util.Util;

/**
 * Controller-Servlet for deleting a file in a submission
 * @author Sven Strickroth
 *
 */
public class DeleteFile extends HttpServlet {
    @Override
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws IOException, ServletException {
        Session session = RequestAdapter.getSession(request);
        SubmissionDAOIf submissionDAO = DAOFactory.SubmissionDAOIf(session);
        Submission submission = submissionDAO.getSubmission(Util.parseInteger(request.getParameter("sid"), 0));

        ContextAdapter contextAdapter = new ContextAdapter(getServletContext());

        if (submission == null) {
            request.setAttribute("title", "Abgabe nicht gefunden");
            request.getRequestDispatcher("/" + contextAdapter.getServletsPath() + "/MessageView").forward(request,
                    response);
            return;
        }

        Task task = submission.getTask();

        // check Lecture Participation
        ParticipationDAOIf participationDAO = DAOFactory.ParticipationDAOIf(session);
        Participation participation = participationDAO.getParticipation(RequestAdapter.getUser(request),
                task.getTaskGroup().getLecture());
        if (participation == null) {
            response.sendError(HttpServletResponse.SC_FORBIDDEN, "insufficient rights");
            return;
        }

        Submission checkSubmission = submissionDAO.getSubmission(task, RequestAdapter.getUser(request));
        if (checkSubmission == null || submission.getSubmissionid() != checkSubmission.getSubmissionid()) {
            response.sendError(HttpServletResponse.SC_FORBIDDEN, "insufficient rights");
            return;
        }

        if (task.getDeadline().before(Util.correctTimezone(new Date()))) {
            request.setAttribute("title", "Abgabe nicht mehr mglich");
            request.getRequestDispatcher("/" + contextAdapter.getServletsPath() + "/MessageView").forward(request,
                    response);
            return;
        }

        if (request.getPathInfo() == null) {
            request.setAttribute("title", "Ungltige Anfrage");
            request.getRequestDispatcher("/" + contextAdapter.getServletsPath() + "/MessageView").forward(request,
                    response);
            return;
        }

        File path = new File(contextAdapter.getDataPath().getAbsolutePath() + System.getProperty("file.separator")
                + task.getTaskGroup().getLecture().getId() + System.getProperty("file.separator") + task.getTaskid()
                + System.getProperty("file.separator") + submission.getSubmissionid()
                + System.getProperty("file.separator"));
        File file = new File(path, request.getPathInfo().substring(1));
        if (file.exists() && file.isFile() && file.delete()) {
            new LogDAO(session).createLogEntry(participation.getUser(), null, submission.getTask(),
                    LogAction.DELETE_FILE, null, null);
            Transaction tx = session.beginTransaction();
            session.lock(submission, LockMode.UPGRADE);
            if (!submissionDAO.deleteIfNoFiles(submission, path)) {
                submission.setLastModified(new Date());
                submissionDAO.saveSubmission(submission);
            }
            tx.commit();

            response.sendRedirect(response.encodeRedirectURL(request.getContextPath() + "/"
                    + contextAdapter.getServletsPath() + "/ShowTask?taskid=" + task.getTaskid()));
            return;
        }

        request.setAttribute("title", "Datei nicht gefunden");
        request.getRequestDispatcher("/" + contextAdapter.getServletsPath() + "/MessageView").forward(request,
                response);
        return;
    }
}