Synnefo

/*

 * Copyright 2008, 2009 Electronic Business Systems Ltd.

 *

 * This file is part of GSS.

 *

 * GSS is free software: you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation, either version 3 of the License, or

 * (at your option) any later version.

 *

 * GSS 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 GSS.  If not, see <http://www.gnu.org/licenses/>.

 */

package gr.ebs.gss.server.rest;

import gr.ebs.gss.client.exceptions.InsufficientPermissionsException;

import gr.ebs.gss.client.exceptions.ObjectNotFoundException;

import gr.ebs.gss.client.exceptions.RpcException;

import gr.ebs.gss.server.domain.User;

import gr.ebs.gss.server.domain.dto.FileHeaderDTO;

import gr.ebs.gss.server.domain.dto.FolderDTO;

import gr.ebs.gss.server.ejb.TransactionHelper;

import java.io.IOException;

import java.net.URLEncoder;

import java.util.ArrayList;

import java.util.List;

import java.util.concurrent.Callable;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;

import org.json.JSONException;

import org.json.JSONObject;

/**

 * A class that handles operations on the 'trash' namespace.

 *

 * @author past

 */

public class TrashHandler extends RequestHandler {

        /**

         * The logger.

         */

        private static Log logger = LogFactory.getLog(TrashHandler.class);

        /**

         * Return the files and folders that are in the trash can.

         *

     * @param req The servlet request we are processing

     * @param resp The servlet response we are processing

         * @throws IOException if the response cannot be sent

         * @throws ServletException

         */

        void serveTrash(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException {

        String path = getInnerPath(req, PATH_TRASH);

                if (path.equals(""))

                        path = "/";

            if (!path.equals("/")) {

                        resp.sendError(HttpServletResponse.SC_NOT_FOUND);

                        return;

            }

            List<FileHeaderDTO> files = null;

                List<FolderDTO> folders = null;

            User user = getUser(req);

            User owner = getOwner(req);

            if (!owner.equals(user)) {

                    resp.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED);

                    return;

            }

                try {

                        files = getService().getDeletedFiles(user.getId());

                        folders = getService().getDeletedRootFolders(user.getId());

                } catch (ObjectNotFoundException e) {

                        resp.sendError(HttpServletResponse.SC_NOT_FOUND);

                        return;

                } catch (RpcException e) {

                        logger.error("", e);

                        resp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);

                        return;

                }

                if (files.isEmpty() && folders.isEmpty()) {

                        resp.sendError(HttpServletResponse.SC_NO_CONTENT);

                        return;

                }

                JSONObject json = new JSONObject();

            try {

                    List<JSONObject> trashFolders = new ArrayList<JSONObject>();

                    for (FolderDTO f: folders) {

                            JSONObject j = new JSONObject();

                            j.put("name", f.getName()).

                                    put("uri", getApiRoot() + f.getURI());

                            if (f.getParent() != null)

                                    j.put("parent", getApiRoot() + f.getParent().getURI());

                                trashFolders.add(j);

                    }

                    json.put("folders", trashFolders);

                    List<JSONObject> trashFiles = new ArrayList<JSONObject>();

                    for (FileHeaderDTO f: files) {

                            JSONObject j = new JSONObject();

                                j.put("name", f.getName()).

                                        put("owner", f.getOwner().getUsername()).

                                        put("deleted", f.isDeleted()).

                                        put("version", f.getVersion()).

                                        put("size", f.getFileSize()).

                                        put("content", f.getMimeType()).

                                        put("path", f.getFolder().getPath()).

                                        put("creationDate", f.getAuditInfo().getCreationDate().getTime()).

                                    put("uri", getApiRoot() + f.getURI());

                                JSONObject p = new JSONObject();

                                p.put("uri", getApiRoot() + f.getFolder().getURI()).

                                                put("name", URLEncoder.encode(f.getFolder().getName(),"UTF-8"));

                                j.put("folder", p);

                                trashFiles.add(j);

                    }

                    json.put("files", trashFiles);

                } catch (JSONException e) {

                        logger.error("", e);

                        resp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);

                        return;

                }

                // Workaround for IE's broken caching behavior.

                   resp.setHeader("Expires", "-1");

            sendJson(req, resp, json.toString());

        }

        /**

         * Empties the trash can from any currently stored resource,

         * making all trashed files and folders permanently deleted.

         *

     * @param req The HTTP request we are processing

     * @param resp The HTTP response we are processing

         * @throws IOException

     * @throws IOException if an input/output error occurs

         */

        public void emptyTrash(HttpServletRequest req, HttpServletResponse resp) throws IOException {

        String path = getInnerPath(req, PATH_TRASH);

                if (path.equals(""))

                        path = "/";

            if (!path.equals("/")) {

                        resp.sendError(HttpServletResponse.SC_NOT_FOUND);

                        return;

            }

                try {

                        User user = getUser(req);

                        final User owner = getOwner(req);

                        if (!owner.equals(user))

                                throw new InsufficientPermissionsException("User " + user.getUsername()

                                                        + " does not have permission to empty the trash can owned by "

                                                        + owner.getUsername());

                        if (logger.isDebugEnabled())

                                logger.debug("Emptying trash for user " + owner.getUsername());

                        new TransactionHelper<Void>().tryExecute(new Callable<Void>() {

                                @Override

                                public Void call() throws Exception {

                                        getService().emptyTrash(owner.getId());

                                        return null;

                                }

                        });

                        resp.setStatus(HttpServletResponse.SC_NO_CONTENT);

                } catch (RpcException e) {

                        logger.error("", e);

                        resp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);

                } catch (ObjectNotFoundException e) {

                        resp.sendError(HttpServletResponse.SC_NOT_FOUND, e.getMessage());

                } catch (InsufficientPermissionsException e) {

                        resp.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED, e.getMessage());

                } catch (Exception e) {

                        logger.error("", e);

                        resp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);

                }

        }

}