Synnefo » Pithos Web Client

/*

 * Copyright 2011-2012 GRNET S.A. All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or

 * without modification, are permitted provided that the following

 * conditions are met:

 *

 *   1. Redistributions of source code must retain the above

 *      copyright notice, this list of conditions and the following

 *      disclaimer.

 *

 *   2. Redistributions in binary form must reproduce the above

 *      copyright notice, this list of conditions and the following

 *      disclaimer in the documentation and/or other materials

 *      provided with the distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS

 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF

 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED

 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN

 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

 * POSSIBILITY OF SUCH DAMAGE.

 *

 * The views and conclusions contained in the software and

 * documentation are those of the authors and should not be

 * interpreted as representing official policies, either expressed

 * or implied, of GRNET S.A.

 */

package gr.grnet.pithos.web.client;

import gr.grnet.pithos.web.client.commands.UploadFileCommand;

import gr.grnet.pithos.web.client.foldertree.AccountResource;

import gr.grnet.pithos.web.client.foldertree.File;

import gr.grnet.pithos.web.client.foldertree.Folder;

import gr.grnet.pithos.web.client.foldertree.FolderTreeView;

import gr.grnet.pithos.web.client.foldertree.FolderTreeViewModel;

import gr.grnet.pithos.web.client.foldertree.Resource;

import gr.grnet.pithos.web.client.grouptree.Group;

import gr.grnet.pithos.web.client.grouptree.GroupTreeView;

import gr.grnet.pithos.web.client.grouptree.GroupTreeViewModel;

import gr.grnet.pithos.web.client.mysharedtree.MysharedTreeView;

import gr.grnet.pithos.web.client.mysharedtree.MysharedTreeViewModel;

import gr.grnet.pithos.web.client.othersharedtree.OtherSharedTreeView;

import gr.grnet.pithos.web.client.othersharedtree.OtherSharedTreeViewModel;

import gr.grnet.pithos.web.client.rest.DeleteRequest;

import gr.grnet.pithos.web.client.rest.GetRequest;

import gr.grnet.pithos.web.client.rest.HeadRequest;

import gr.grnet.pithos.web.client.rest.PutRequest;

import gr.grnet.pithos.web.client.rest.RestException;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.Iterator;

import java.util.List;

import java.util.Set;

import com.google.gwt.core.client.EntryPoint;

import com.google.gwt.core.client.GWT;

import com.google.gwt.core.client.Scheduler;

import com.google.gwt.core.client.Scheduler.RepeatingCommand;

import com.google.gwt.core.client.Scheduler.ScheduledCommand;

import com.google.gwt.event.dom.client.ClickEvent;

import com.google.gwt.event.dom.client.ClickHandler;

import com.google.gwt.event.logical.shared.ResizeEvent;

import com.google.gwt.event.logical.shared.ResizeHandler;

import com.google.gwt.http.client.Request;

import com.google.gwt.http.client.RequestBuilder;

import com.google.gwt.http.client.RequestCallback;

import com.google.gwt.http.client.RequestException;

import com.google.gwt.http.client.Response;

import com.google.gwt.http.client.URL;

import com.google.gwt.i18n.client.Dictionary;

import com.google.gwt.i18n.client.NumberFormat;

import com.google.gwt.json.client.JSONArray;

import com.google.gwt.json.client.JSONObject;

import com.google.gwt.json.client.JSONParser;

import com.google.gwt.json.client.JSONString;

import com.google.gwt.json.client.JSONValue;

import com.google.gwt.resources.client.ImageResource;

import com.google.gwt.resources.client.ImageResource.ImageOptions;

import com.google.gwt.user.client.Command;

import com.google.gwt.user.client.Cookies;

import com.google.gwt.user.client.Event;

import com.google.gwt.user.client.History;

import com.google.gwt.user.client.Window;

import com.google.gwt.user.client.ui.AbstractImagePrototype;

import com.google.gwt.user.client.ui.Button;

import com.google.gwt.user.client.ui.Composite;

import com.google.gwt.user.client.ui.FlowPanel;

import com.google.gwt.user.client.ui.HTML;

import com.google.gwt.user.client.ui.HasHorizontalAlignment;

import com.google.gwt.user.client.ui.HasVerticalAlignment;

import com.google.gwt.user.client.ui.HorizontalPanel;

import com.google.gwt.user.client.ui.HorizontalSplitPanel;

import com.google.gwt.user.client.ui.RootPanel;

import com.google.gwt.user.client.ui.VerticalPanel;

import com.google.gwt.view.client.SelectionChangeEvent;

import com.google.gwt.view.client.SelectionChangeEvent.Handler;

import com.google.gwt.view.client.SingleSelectionModel;

/**

 * Entry point classes define <code>onModuleLoad()</code>.

 */

public class Pithos implements EntryPoint, ResizeHandler {

        public static final String HOME_CONTAINER = "pithos";

        public static final String TRASH_CONTAINER = "trash";

        public static final Configuration config = GWT.create(Configuration.class);

        /**

         * Instantiate an application-level image bundle. This object will provide

         * programmatic access to all the images needed by widgets.

         */

        static Images images = (Images) GWT.create(Images.class);

    public String getUsername() {

        return username;

    }

    public void setAccount(AccountResource acct) {

        account = acct;

    }

    public AccountResource getAccount() {

        return account;

    }

    public void updateFolder(Folder f, boolean showfiles, Command callback, final boolean openParent) {

        folderTreeView.updateFolder(f, showfiles, callback, openParent);

    }

    public void updateGroupNode(Group group) {

        groupTreeView.updateGroupNode(group);

    }

    public void updateMySharedRoot() {

            mysharedTreeView.updateRoot();

    }

    public void updateSharedFolder(Folder f, boolean showfiles) {

            mysharedTreeView.updateFolder(f, showfiles);

    }

    public void updateOtherSharedFolder(Folder f, boolean showfiles) {

            otherSharedTreeView.updateFolder(f, showfiles);

    }

    public MysharedTreeView getMySharedTreeView() {

        return mysharedTreeView;

    }

    /**

         * An aggregate image bundle that pulls together all the images for this

         * application into a single bundle.

         */

        public interface Images extends TopPanel.Images, FileList.Images, ToolsMenu.Images {

                @Source("gr/grnet/pithos/resources/document.png")

                ImageResource folders();

                @Source("gr/grnet/pithos/resources/advancedsettings.png")

                @ImageOptions(width=32, height=32)

                ImageResource tools();

        }

        private Throwable error;

        /**

         * The Application Clipboard implementation;

         */

        private Clipboard clipboard = new Clipboard();

        /**

         * The top panel that contains the menu bar.

         */

        private TopPanel topPanel;

        /**

         * The panel that contains the various system messages.

         */

        private MessagePanel messagePanel = new MessagePanel(this, Pithos.images);

        /**

         * The bottom panel that contains the status bar.

         */

        private StatusPanel statusPanel = null;

        /**

         * The file list widget.

         */

        private FileList fileList;

        /**

         * The tab panel that occupies the right side of the screen.

         */

        private VerticalPanel inner = new VerticalPanel();

        /**

         * The split panel that will contain the left and right panels.

         */

        private HorizontalSplitPanel splitPanel = new HorizontalSplitPanel();

        /**

         * The currently selected item in the application, for use by the Edit menu

         * commands. Potential types are Folder, File, User and Group.

         */

        private Object currentSelection;

        public HashMap<String, String> userFullNameMap = new HashMap<String, String>();

    private String username = null;

    /**

     * The authentication token of the current user.

     */

    private String token;

    VerticalPanel trees;

    SingleSelectionModel<Folder> folderTreeSelectionModel;

    FolderTreeViewModel folderTreeViewModel;

    FolderTreeView folderTreeView;

    SingleSelectionModel<Folder> mysharedTreeSelectionModel;

    MysharedTreeViewModel mysharedTreeViewModel;

    MysharedTreeView mysharedTreeView = null;;

    protected SingleSelectionModel<Folder> otherSharedTreeSelectionModel;

    OtherSharedTreeViewModel otherSharedTreeViewModel;

    OtherSharedTreeView otherSharedTreeView = null;

    GroupTreeViewModel groupTreeViewModel;

    GroupTreeView groupTreeView;

    TreeView selectedTree;

    protected AccountResource account;

    Folder trash;

    List<Composite> treeViews = new ArrayList<Composite>();

    @SuppressWarnings("rawtypes") List<SingleSelectionModel> selectionModels = new ArrayList<SingleSelectionModel>();

    public Button upload;

    private HTML numOfFiles;

    private Toolbar toolbar;

    private FileUploadDialog fileUploadDialog;

        @Override

        public void onModuleLoad() {

                if (parseUserCredentials())

            initialize();

        }

    private void initialize() {

            boolean bareContent = Window.Location.getParameter("noframe") != null;

            String contentWidth = bareContent ? "100%" : "75%";

            VerticalPanel outer = new VerticalPanel();

        outer.setWidth("100%");

            if (!bareContent) {

                    outer.addStyleName("pithos-outer");

            }

        if (!bareContent) {

                topPanel = new TopPanel(this, Pithos.images);

                topPanel.setWidth("100%");

                outer.add(topPanel);

                outer.setCellHorizontalAlignment(topPanel, HasHorizontalAlignment.ALIGN_CENTER);

        }

        messagePanel.setVisible(false);

        outer.add(messagePanel);

        outer.setCellHorizontalAlignment(messagePanel, HasHorizontalAlignment.ALIGN_CENTER);

        outer.setCellVerticalAlignment(messagePanel, HasVerticalAlignment.ALIGN_MIDDLE);

        HorizontalPanel header = new HorizontalPanel();

        header.addStyleName("pithos-header");

        header.setWidth(contentWidth);

        if (bareContent)

                header.addStyleName("pithos-header-noframe");

        upload = new Button("Upload", new ClickHandler() {

            @Override

            public void onClick(ClickEvent event) {

                    if (getSelection() != null)

                            new UploadFileCommand(Pithos.this, null, getSelection()).execute();

            }

        });

        upload.addStyleName("pithos-uploadButton");

        header.add(upload);

        header.setCellHorizontalAlignment(upload, HasHorizontalAlignment.ALIGN_LEFT);

        header.setCellVerticalAlignment(upload, HasVerticalAlignment.ALIGN_MIDDLE);

        toolbar = new Toolbar(this);

        header.add(toolbar);

        header.setCellHorizontalAlignment(toolbar, HasHorizontalAlignment.ALIGN_CENTER);

        header.setCellVerticalAlignment(toolbar, HasVerticalAlignment.ALIGN_MIDDLE);

        HorizontalPanel folderStatistics = new HorizontalPanel();

        folderStatistics.addStyleName("pithos-folderStatistics");

        numOfFiles = new HTML();

        folderStatistics.add(numOfFiles);

        folderStatistics.setCellVerticalAlignment(numOfFiles, HasVerticalAlignment.ALIGN_MIDDLE);

        HTML numOfFilesLabel = new HTML(" Files");

        folderStatistics.add(numOfFilesLabel);

        folderStatistics.setCellVerticalAlignment(numOfFilesLabel, HasVerticalAlignment.ALIGN_MIDDLE);

        header.add(folderStatistics);

        header.setCellHorizontalAlignment(folderStatistics, HasHorizontalAlignment.ALIGN_RIGHT);

        header.setCellVerticalAlignment(folderStatistics, HasVerticalAlignment.ALIGN_MIDDLE);

        header.setCellWidth(folderStatistics, "40px");

        outer.add(header);

        outer.setCellHorizontalAlignment(header, HasHorizontalAlignment.ALIGN_CENTER);

        // Inner contains the various lists.nner

        inner.sinkEvents(Event.ONCONTEXTMENU);

        inner.setWidth("100%");

        folderTreeSelectionModel = new SingleSelectionModel<Folder>();

        folderTreeSelectionModel.addSelectionChangeHandler(new SelectionChangeEvent.Handler() {

            @Override

            public void onSelectionChange(SelectionChangeEvent event) {

                if (folderTreeSelectionModel.getSelectedObject() != null) {

                    deselectOthers(folderTreeView, folderTreeSelectionModel);

                    applyPermissions(folderTreeSelectionModel.getSelectedObject());

                    Folder f = folderTreeSelectionModel.getSelectedObject();

                            updateFolder(f, true, new Command() {

                                    @Override

                                    public void execute() {

                                            updateStatistics();

                                    }

                            }, true);

                            showRelevantToolbarButtons();

                }

                                else {

                                        if (getSelectedTree().equals(folderTreeView))

                                                setSelectedTree(null);

                                        if (getSelectedTree() == null)

                                                showRelevantToolbarButtons();

                                }

            }

        });

        selectionModels.add(folderTreeSelectionModel);

        folderTreeViewModel = new FolderTreeViewModel(this, folderTreeSelectionModel);

        folderTreeView = new FolderTreeView(folderTreeViewModel);

        treeViews.add(folderTreeView);

        fileList = new FileList(this, images);

        inner.add(fileList);

        inner.add(createUploadArea());

        trees = new VerticalPanel();

        trees.setWidth("100%");

        // Add the left and right panels to the split panel.

        splitPanel.setLeftWidget(trees);

        splitPanel.setRightWidget(inner);

        splitPanel.setSplitPosition("219px");

        splitPanel.setSize("100%", "100%");

        splitPanel.addStyleName("pithos-splitPanel");

        splitPanel.setWidth(contentWidth);

        outer.add(splitPanel);

        outer.setCellHorizontalAlignment(splitPanel, HasHorizontalAlignment.ALIGN_CENTER);

        if (!bareContent) {

                statusPanel = new StatusPanel();

                statusPanel.setWidth("100%");

                outer.add(statusPanel);

                outer.setCellHorizontalAlignment(statusPanel, HasHorizontalAlignment.ALIGN_CENTER);

        }

        else

                splitPanel.addStyleName("pithos-splitPanel-noframe");

        // Hook the window resize event, so that we can adjust the UI.

        Window.addResizeHandler(this);

        // Clear out the window's built-in margin, because we want to take

        // advantage of the entire client area.

        Window.setMargin("0px");

        // Finally, add the outer panel to the RootPanel, so that it will be

        // displayed.

        RootPanel.get().add(outer);

        // Call the window resized handler to get the initial sizes setup. Doing

        // this in a deferred command causes it to occur after all widgets'

        // sizes have been computed by the browser.

        Scheduler.get().scheduleDeferred(new ScheduledCommand() {

            @Override

            public void execute() {

                onWindowResized(Window.getClientHeight());

            }

        });

        Scheduler.get().scheduleDeferred(new ScheduledCommand() {

            @Override

            public void execute() {

                fetchAccount(new Command() {

                                        @Override

                                        public void execute() {

                                if (!account.hasHomeContainer())

                                    createHomeContainer(account, this);

                                else if (!account.hasTrashContainer())

                                        createTrashContainer(this);

                                else {

                                        for (Folder f : account.getContainers())

                                                if (f.getName().equals(Pithos.TRASH_CONTAINER)) {

                                                        trash = f;

                                                        break;

                                                }

                                    trees.add(folderTreeView);

                                    folderTreeViewModel.initialize(account, new Command() {

                                                                @Override

                                                                public void execute() {

                                                    createMySharedTree();

                                                                }

                                                        });

                                    HorizontalPanel separator = new HorizontalPanel();

                                    separator.addStyleName("pithos-statisticsSeparator");

                                    separator.add(new HTML(""));

                                    trees.add(separator);

                                    groupTreeViewModel = new GroupTreeViewModel(Pithos.this);

                                    groupTreeView = new GroupTreeView(groupTreeViewModel);

                                    treeViews.add(groupTreeView);

                                    trees.add(groupTreeView);

                                    folderTreeView.showStatistics(account);

                                }

                                        }

                                });

            }

        });

        Scheduler.get().scheduleFixedDelay(new RepeatingCommand() {

                        @Override

                        public boolean execute() {

                                Folder f = getSelection();

                                if (f != null) {

                                        if (getSelectedTree().equals(folderTreeView))

                                                updateFolder(f, true, null, false);

                                        else if (getSelectedTree().equals(mysharedTreeView))

                                                updateSharedFolder(f, true);

                                }

                                return true;

                        }

                }, 3000);

    }

    public void applyPermissions(Folder f) {

            if (f != null) {

                    if (f.isInTrash()) {

                            upload.setEnabled(false);

                            hideUploadArea();

                    }

                    else {

                            Boolean[] perms = f.getPermissions().get(username);

                            if (f.getOwner().equals(username) || (perms != null && perms[1] != null && perms[1])) {

                                    upload.setEnabled(true);

                                    showUploadArea();

                            }

                            else {

                                    upload.setEnabled(false);

                                    hideUploadArea();

                            }

                    }

            }

            else {

                    upload.setEnabled(false);

                    hideUploadArea();

            }

        }

        @SuppressWarnings({ "rawtypes", "unchecked" })

        public void deselectOthers(TreeView _selectedTree, SingleSelectionModel model) {

            selectedTree = _selectedTree;

        for (SingleSelectionModel s : selectionModels)

            if (!s.equals(model) && s.getSelectedObject() != null)

                s.setSelected(s.getSelectedObject(), false);

    }

    public void showFiles(final Folder f) {

        Set<File> files = f.getFiles();

        showFiles(files);

    }

    public void showFiles(Set<File> files) {

        fileList.setFiles(new ArrayList<File>(files));

    }

    /**

         * Parse and store the user credentials to the appropriate fields.

         */

        private boolean parseUserCredentials() {

        Configuration conf = (Configuration) GWT.create(Configuration.class);

                Dictionary otherProperties = Dictionary.getDictionary("otherProperties");

        String cookie = otherProperties.get("authCookie");

        String auth = Cookies.getCookie(cookie);

        if (auth == null) {

            authenticateUser();

            return false;

        }

        if (auth.startsWith("\""))

                auth = auth.substring(1);

        if (auth.endsWith("\""))

                auth = auth.substring(0, auth.length() - 1);

                String[] authSplit = auth.split("\\" + conf.cookieSeparator(), 2);

                if (authSplit.length != 2) {

                    authenticateUser();

                    return false;

                }

                username = authSplit[0];

                token = authSplit[1];

        String gotoUrl = Window.Location.getParameter("goto");

                if (gotoUrl != null && gotoUrl.length() > 0) {

                        Window.Location.assign(gotoUrl);

                        return false;

                }

                return true;

    }

    /**

         * Redirect the user to the login page for authentication.

         */

        protected void authenticateUser() {

                Dictionary otherProperties = Dictionary.getDictionary("otherProperties");

        Window.Location.assign(otherProperties.get("loginUrl") + Window.Location.getHref());

        }

        protected void fetchAccount(final Command callback) {

        String path = "?format=json";

        GetRequest<AccountResource> getAccount = new GetRequest<AccountResource>(AccountResource.class, getApiPath(), username, path) {

            @Override

            public void onSuccess(AccountResource _result) {

                account = _result;

                if (callback != null)

                        callback.execute();

            }

            @Override

            public void onError(Throwable t) {

                GWT.log("Error getting account", t);

                                setError(t);

                if (t instanceof RestException)

                    displayError("Error getting account: " + ((RestException) t).getHttpStatusText());

                else

                    displayError("System error fetching user data: " + t.getMessage());

            }

                        @Override

                        protected void onUnauthorized(Response response) {

                                sessionExpired();

                        }

        };

        getAccount.setHeader("X-Auth-Token", token);

        Scheduler.get().scheduleDeferred(getAccount);

    }

    public void updateStatistics() {

            HeadRequest<AccountResource> headAccount = new HeadRequest<AccountResource>(AccountResource.class, getApiPath(), username, "", account) {

                        @Override

                        public void onSuccess(AccountResource _result) {

                                folderTreeView.showStatistics(account);

                        }

                        @Override

                        public void onError(Throwable t) {

                GWT.log("Error getting account", t);

                                setError(t);

                if (t instanceof RestException)

                    displayError("Error getting account: " + ((RestException) t).getHttpStatusText());

                else

                    displayError("System error fetching user data: " + t.getMessage());

                        }

                        @Override

                        protected void onUnauthorized(Response response) {

                                sessionExpired();

                        }

                };

                headAccount.setHeader("X-Auth-Token", token);

                Scheduler.get().scheduleDeferred(headAccount);

        }

        protected void createHomeContainer(final AccountResource _account, final Command callback) {

        String path = "/" + Pithos.HOME_CONTAINER;

        PutRequest createPithos = new PutRequest(getApiPath(), getUsername(), path) {

            @Override

            public void onSuccess(Resource result) {

                    if (!_account.hasTrashContainer())

                            createTrashContainer(callback);

                    else

                            fetchAccount(callback);

            }

            @Override

            public void onError(Throwable t) {

                GWT.log("Error creating pithos", t);

                                setError(t);

                if (t instanceof RestException)

                    displayError("Error creating pithos: " + ((RestException) t).getHttpStatusText());

                else

                    displayError("System error Error creating pithos: " + t.getMessage());

            }

                        @Override

                        protected void onUnauthorized(Response response) {

                                sessionExpired();

                        }

        };

        createPithos.setHeader("X-Auth-Token", getToken());

        Scheduler.get().scheduleDeferred(createPithos);

    }

    protected void createTrashContainer(final Command callback) {

        String path = "/" + Pithos.TRASH_CONTAINER;

        PutRequest createPithos = new PutRequest(getApiPath(), getUsername(), path) {

            @Override

            public void onSuccess(Resource result) {

                           fetchAccount(callback);

            }

            @Override

            public void onError(Throwable t) {

                GWT.log("Error creating pithos", t);

                                setError(t);

                if (t instanceof RestException)

                    displayError("Error creating pithos: " + ((RestException) t).getHttpStatusText());

                else

                    displayError("System error Error creating pithos: " + t.getMessage());

            }

                        @Override

                        protected void onUnauthorized(Response response) {

                                sessionExpired();

                        }

        };

        createPithos.setHeader("X-Auth-Token", getToken());

        Scheduler.get().scheduleDeferred(createPithos);

    }

    /**

         * Creates an HTML fragment that places an image & caption together, for use

         * in a group header.

         *

         * @param imageProto an image prototype for an image

         * @param caption the group caption

         * @return the header HTML fragment

         */

        private String createHeaderHTML(AbstractImagePrototype imageProto, String caption) {

                String captionHTML = "<table class='caption' cellpadding='0' " 

                + "cellspacing='0'>" + "<tr><td class='lcaption'>" + imageProto.getHTML() 

                + "</td><td id =" + caption +" class='rcaption'><b style='white-space:nowrap'>&nbsp;" 

                + caption + "</b></td></tr></table>";

                return captionHTML;

        }

        protected void onWindowResized(int height) {

                // Adjust the split panel to take up the available room in the window.

                int newHeight = height - splitPanel.getAbsoluteTop();

                if (newHeight < 1)

                        newHeight = 1;

                splitPanel.setHeight("" + newHeight);

                inner.setHeight("" + newHeight);

        }

        @Override

        public void onResize(ResizeEvent event) {

                int height = event.getHeight();

                onWindowResized(height);

        }

        /**

         * Display an error message.

         *

         * @param msg the message to display

         */

        public void displayError(String msg) {

                messagePanel.displayError(msg);

        }

        /**

         * Display a warning message.

         *

         * @param msg the message to display

         */

        public void displayWarning(String msg) {

                messagePanel.displayWarning(msg);

        }

        /**

         * Display an informational message.

         *

         * @param msg the message to display

         */

        public void displayInformation(String msg) {

                messagePanel.displayInformation(msg);

        }

        /**

         * Retrieve the fileList.

         *

         * @return the fileList

         */

        public FileList getFileList() {

                return fileList;

        }

        /**

         * Retrieve the topPanel.

         *

         * @return the topPanel

         */

        TopPanel getTopPanel() {

                return topPanel;

        }

        /**

         * Retrieve the clipboard.

         *

         * @return the clipboard

         */

        public Clipboard getClipboard() {

                return clipboard;

        }

        public StatusPanel getStatusPanel() {

                return statusPanel;

        }

        public String getToken() {

                return token;

        }

        public static native void preventIESelection() /*-{

                $doc.body.onselectstart = function () { return false; };

        }-*/;

        public static native void enableIESelection() /*-{

                if ($doc.body.onselectstart != null)

                $doc.body.onselectstart = null;

        }-*/;

        /**

         * @return the absolute path of the API root URL

         */

        public String getApiPath() {

                Configuration conf = (Configuration) GWT.create(Configuration.class);

                return conf.apiPath();

        }

        /**

         * History support for folder navigation

         * adds a new browser history entry

         *

         * @param key

         */

        public void updateHistory(String key){

//                Replace any whitespace of the initial string to "+"

//                String result = key.replaceAll("\\s","+");

//                Add a new browser history entry.

//                History.newItem(result);

                History.newItem(key);

        }

    public void deleteFolder(final Folder folder, final Command callback) {

        String path = getApiPath() + folder.getOwner() + "/" + folder.getContainer() + "?format=json&delimiter=/&prefix=" + URL.encodeQueryString(folder.getPrefix()) + "&t=" + System.currentTimeMillis();

        RequestBuilder builder = new RequestBuilder(RequestBuilder.GET, path);

        builder.setHeader("X-Auth-Token", getToken());

        try {

            builder.sendRequest("", new RequestCallback() {

                @Override

                public void onResponseReceived(Request request, Response response) {

                    if (response.getStatusCode() == Response.SC_OK) {

                        JSONValue json = JSONParser.parseStrict(response.getText());

                        JSONArray array = json.isArray();

                        int i = 0;

                        if (array != null) {

                            deleteObject(folder, i, array, callback);

                        }

                    }

                }

                @Override

                public void onError(Request request, Throwable exception) {

                        setError(exception);

                    displayError("System error unable to delete folder: " + exception.getMessage());

                }

            });

        }

        catch (RequestException e) {

        }

    }

    void deleteObject(final Folder folder, final int i, final JSONArray array, final Command callback) {

        if (i < array.size()) {

            JSONObject o = array.get(i).isObject();

            if (o != null && !o.containsKey("subdir")) {

                JSONString name = o.get("name").isString();

                String path = "/" + folder.getContainer() + "/" + name.stringValue();

                DeleteRequest delete = new DeleteRequest(getApiPath(), folder.getOwner(), URL.encode(path)) {

                    @Override

                    public void onSuccess(Resource result) {

                        deleteObject(folder, i + 1, array, callback);

                    }

                    @Override

                    public void onError(Throwable t) {

                        GWT.log("", t);

                                                setError(t);

                        displayError("System error unable to delete folder: " + t.getMessage());

                    }

                                    @Override

                                    protected void onUnauthorized(Response response) {

                                            sessionExpired();

                                    }

                };

                delete.setHeader("X-Auth-Token", getToken());

                Scheduler.get().scheduleDeferred(delete);

            }

            else if (o != null) {

                String subdir = o.get("subdir").isString().stringValue();

                subdir = subdir.substring(0, subdir.length() - 1);