code.grnet.gr Git - pithos/blob - src/gr/ebs/gss/client/GSS.java

   1 /*
   2  * Copyright 2007, 2008, 2009 Electronic Business Systems Ltd.
   3  *
   4  * This file is part of GSS.
   5  *
   6  * GSS is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * GSS is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with GSS.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19 package gr.ebs.gss.client;
  20
  21 import gr.ebs.gss.client.clipboard.Clipboard;
  22 import gr.ebs.gss.client.dnd.DnDFocusPanel;
  23 import gr.ebs.gss.client.rest.GetCommand;
  24 import gr.ebs.gss.client.rest.RestException;
  25 import gr.ebs.gss.client.rest.resource.FileResource;
  26 import gr.ebs.gss.client.rest.resource.FolderResource;
  27 import gr.ebs.gss.client.rest.resource.TrashResource;
  28 import gr.ebs.gss.client.rest.resource.UserResource;
  29
  30 import java.util.Iterator;
  31 import java.util.List;
  32
  33 import com.allen_sauer.gwt.dnd.client.DragContext;
  34 import com.allen_sauer.gwt.dnd.client.PickupDragController;
  35 import com.allen_sauer.gwt.dnd.client.VetoDragException;
  36 import com.google.gwt.core.client.EntryPoint;
  37 import com.google.gwt.core.client.GWT;
  38 import com.google.gwt.user.client.Command;
  39 import com.google.gwt.user.client.Cookies;
  40 import com.google.gwt.user.client.DOM;
  41 import com.google.gwt.user.client.DeferredCommand;
  42 import com.google.gwt.user.client.Window;
  43 import com.google.gwt.user.client.WindowResizeListener;
  44 import com.google.gwt.user.client.ui.AbsolutePanel;
  45 import com.google.gwt.user.client.ui.AbstractImagePrototype;
  46 import com.google.gwt.user.client.ui.DockPanel;
  47 import com.google.gwt.user.client.ui.HTML;
  48 import com.google.gwt.user.client.ui.HasHorizontalAlignment;
  49 import com.google.gwt.user.client.ui.HasVerticalAlignment;
  50 import com.google.gwt.user.client.ui.HorizontalSplitPanel;
  51 import com.google.gwt.user.client.ui.Label;
  52 import com.google.gwt.user.client.ui.RootPanel;
  53 import com.google.gwt.user.client.ui.SourcesTabEvents;
  54 import com.google.gwt.user.client.ui.TabListener;
  55 import com.google.gwt.user.client.ui.TabPanel;
  56 import com.google.gwt.user.client.ui.TreeItem;
  57 import com.google.gwt.user.client.ui.VerticalPanel;
  58 import com.google.gwt.user.client.ui.Widget;
  59
  60
  61 /**
  62  * Entry point classes define <code>onModuleLoad()</code>.
  63  */
  64 public class GSS implements EntryPoint, WindowResizeListener {
  65
  66         /**
  67          * A constant that denotes the completion of an IncrementalCommand.
  68          */
  69         public static final boolean DONE = false;
  70
  71         public static final int VISIBLE_FILE_COUNT = 100;
  72
  73         /**
  74          * Instantiate an application-level image bundle. This object will provide
  75          * programmatic access to all the images needed by widgets.
  76          */
  77         private static Images images = (Images) GWT.create(Images.class);
  78         private GlassPanel glassPanel = new GlassPanel();
  79
  80         /**
  81          * An aggregate image bundle that pulls together all the images for this
  82          * application into a single bundle.
  83          */
  84         public interface Images extends TopPanel.Images, StatusPanel.Images, FileMenu.Images, EditMenu.Images, SettingsMenu.Images, GroupMenu.Images, FilePropertiesDialog.Images, MessagePanel.Images, FileList.Images,  SearchResults.Images, Search.Images, Groups.Images, Folders.Images {
  85
  86                 @Resource("gr/ebs/gss/resources/document.png")
  87                 AbstractImagePrototype folders();
  88
  89                 @Resource("gr/ebs/gss/resources/edit_group_22.png")
  90                 AbstractImagePrototype groups();
  91
  92                 @Resource("gr/ebs/gss/resources/search.png")
  93                 AbstractImagePrototype search();
  94         }
  95
  96         /**
  97          * The single GSS instance.
  98          */
  99         private static GSS singleton;
 100
 101         /**
 102          * Gets the singleton GSS instance.
 103          *
 104          * @return the GSS object
 105          */
 106         public static GSS get() {
 107                 if (GSS.singleton == null)
 108                         GSS.singleton = new GSS();
 109                 return GSS.singleton;
 110         }
 111
 112         /**
 113          * The Application Clipboard implementation;
 114          */
 115         private Clipboard clipboard = new Clipboard();
 116
 117         private UserResource currentUserResource;
 118
 119         /**
 120          * The top panel that contains the menu bar.
 121          */
 122         private TopPanel topPanel;
 123
 124         /**
 125          * The panel that contains the various system messages.
 126          */
 127         private MessagePanel messagePanel = new MessagePanel(GSS.images);
 128
 129         /**
 130          * The bottom panel that contains the status bar.
 131          */
 132         private StatusPanel statusPanel = new StatusPanel(GSS.images);
 133
 134         /**
 135          * The top right panel that displays the logged in user details
 136          */
 137         private UserDetailsPanel userDetailsPanel = new UserDetailsPanel();
 138
 139         /**
 140          * The file list widget.
 141          */
 142         private FileList fileList;
 143
 144         /**
 145          * The group list widget.
 146          */
 147         private Groups groups  = new Groups(images);
 148
 149         /**
 150          * The search result widget.
 151          */
 152         private SearchResults searchResults;
 153
 154         /**
 155          * A widget that displays a message indicating that communication with the
 156          * server is underway.
 157          */
 158         private LoadingIndicator loading;
 159
 160         /**
 161          * The tab panel that occupies the right side of the screen.
 162          */
 163         private TabPanel inner = new TabPanel();
 164
 165         /**
 166          * The split panel that will contain the left and right panels.
 167          */
 168         private HorizontalSplitPanel splitPanel = new HorizontalSplitPanel();
 169
 170         /**
 171          * The horizontal panel that will contain the search and status panels.
 172          */
 173         private DockPanel searchStatus = new DockPanel();
 174
 175         /**
 176          * The search widget.
 177          */
 178         private Search search;
 179
 180         /**
 181          * The widget that displays the tree of folders.
 182          */
 183         private Folders folders = new Folders(images);
 184
 185         /**
 186          * The currently selected item in the application, for use by the Edit menu
 187          * commands. Potential types are Folder, File, User and Group.
 188          */
 189         private Object currentSelection;
 190
 191         /**
 192          * The authentication token of the current user.
 193          */
 194         private String token;
 195
 196         /**
 197          * The WebDAV password of the current user
 198          */
 199         private String webDAVPassword;
 200
 201         private PickupDragController dragController;
 202
 203         public void onModuleLoad() {
 204                 // Initialize the singleton before calling the constructors of the
 205                 // various widgets that might call GSS.get().
 206                 singleton = this;
 207                 RootPanel.get().add(glassPanel, 0, 0);
 208                 parseUserCredentials();
 209                 dragController = new PickupDragController(RootPanel.get(), false) {
 210
 211                         @Override
 212                         public void previewDragStart() throws VetoDragException {
 213                             super.previewDragStart();
 214                             if (context.selectedWidgets.isEmpty())
 215                                         throw new VetoDragException();
 216
 217                             if(context.draggable != null){
 218                                         DnDFocusPanel toDrop = (DnDFocusPanel) context.draggable;
 219                                         //prevent drag and drop for trashed files and for unselected tree items
 220                                         if(toDrop.getFiles() != null && folders.isTrashItem(folders.getCurrent()))
 221                                                 throw new VetoDragException();
 222                                         else if(toDrop.getItem() != null && !toDrop.getItem().equals(folders.getCurrent()))
 223                                                 throw new VetoDragException();
 224                                         else if(toDrop.getItem() != null && !toDrop.getItem().isDraggable())
 225                                                 throw new VetoDragException();
 226
 227                             }
 228                           }
 229
 230                         @Override
 231                         protected Widget newDragProxy(DragContext aContext) {
 232                                 AbsolutePanel container = new AbsolutePanel();
 233                                 DOM.setStyleAttribute(container.getElement(), "overflow", "visible");
 234                                 for (Iterator iterator = aContext.selectedWidgets.iterator(); iterator.hasNext();) {
 235                                         Widget widget = (Widget) iterator.next();
 236                                         DnDFocusPanel book = (DnDFocusPanel) widget;
 237                                         HTML html = book.cloneHTML();
 238                                         if(html == null)
 239                                                 container.add(new Label("Drag ME"));
 240                                         else
 241                                                 container.add(html);
 242                                 }
 243                                 return container;
 244                         }
 245                 };
 246                 dragController.setBehaviorDragProxy(true);
 247                 dragController.setBehaviorMultipleSelection(false);
 248                 topPanel = new TopPanel(GSS.images);
 249                 topPanel.setWidth("100%");
 250
 251                 messagePanel.setWidth("100%");
 252                 messagePanel.setVisible(false);
 253
 254                 search = new Search(images);
 255                 searchStatus.add(search, DockPanel.WEST);
 256                 searchStatus.add(userDetailsPanel, DockPanel.EAST);
 257                 searchStatus.setCellHorizontalAlignment(userDetailsPanel, HasHorizontalAlignment.ALIGN_RIGHT);
 258                 searchStatus.setCellVerticalAlignment(search, HasVerticalAlignment.ALIGN_MIDDLE);
 259                 searchStatus.setCellVerticalAlignment(userDetailsPanel, HasVerticalAlignment.ALIGN_MIDDLE);
 260                 searchStatus.setWidth("100%");
 261
 262                 fileList = new FileList(images);
 263
 264                 searchResults = new SearchResults(images);
 265
 266                 // Inner contains the various lists.
 267                 inner.getTabBar().setStyleName("gss-TabBar");
 268                 inner.setStyleName("gss-TabPanel");
 269                 inner.add(fileList, createHeaderHTML(images.folders(), "Files"), true);
 270
 271                 inner.add(groups, createHeaderHTML(images.groups(), "Groups"), true);
 272                 inner.add(searchResults, createHeaderHTML(images.search(), "Search Results"), true);
 273                 inner.setWidth("100%");
 274                 inner.selectTab(0);
 275
 276                 inner.addTabListener(new TabListener() {
 277                         public void onTabSelected(SourcesTabEvents sender, int tabIndex) {
 278                         switch (tabIndex) {
 279                                 case 0:
 280                                         fileList.clearSelectedRows();
 281                                         fileList.updateCurrentlyShowingStats();
 282                                         break;
 283                                 case 1:
 284                                         groups.updateCurrentlyShowingStats();
 285                                         break;
 286                                 case 2:
 287                                         searchResults.clearSelectedRows();
 288                                         searchResults.updateCurrentlyShowingStats();
 289                                         break;
 290                         }
 291                         }
 292
 293                         public boolean onBeforeTabSelected(SourcesTabEvents sender, int tabIndex) {
 294                                 return true;
 295                         }
 296                 });
 297
 298                 // Add the left and right panels to the split panel.
 299                 splitPanel.setLeftWidget(folders);
 300                 splitPanel.setRightWidget(inner);
 301                 splitPanel.setSplitPosition("25%");
 302                 splitPanel.setSize("100%", "100%");
 303
 304                 // Create a dock panel that will contain the menu bar at the top,
 305                 // the shortcuts to the left, the status bar at the bottom and the
 306                 // right panel taking the rest.
 307                 VerticalPanel outer = new VerticalPanel();
 308                 outer.add(topPanel);
 309                 outer.add(searchStatus);
 310                 outer.add(messagePanel);
 311                 outer.add(splitPanel);
 312                 outer.add(statusPanel);
 313                 outer.setWidth("100%");
 314                 outer.setCellHorizontalAlignment(messagePanel, HasHorizontalAlignment.ALIGN_CENTER);
 315
 316                 outer.setSpacing(4);
 317
 318                 loading = new LoadingIndicator();
 319
 320                 // Hook the window resize event, so that we can adjust the UI.
 321                 Window.addWindowResizeListener(this);
 322
 323                 // Clear out the window's built-in margin, because we want to take
 324                 // advantage of the entire client area.
 325                 Window.setMargin("0px");
 326
 327                 // Finally, add the outer panel to the RootPanel, so that it will be
 328                 // displayed.
 329                 RootPanel.get().add(outer);
 330
 331                 // Call the window resized handler to get the initial sizes setup. Doing
 332                 // this in a deferred command causes it to occur after all widgets'
 333                 // sizes have been computed by the browser.
 334                 DeferredCommand.addCommand(new Command() {
 335                         public void execute() {
 336                                 onWindowResized(Window.getClientWidth(), Window.getClientHeight());
 337                         }
 338                 });
 339         }
 340
 341         /**
 342          * Fetches the User object for the specified username.
 343          *
 344          * @param username the username of the user
 345          */
 346         private void fetchUser(final String username) {
 347                 String path = getApiPath() + username + "/";
 348                 GetCommand<UserResource> getUserCommand = new GetCommand<UserResource>(UserResource.class, username, path){
 349
 350                         @Override
 351                         public void onComplete() {
 352                                 currentUserResource = getResult();
 353                                 final String announcement = currentUserResource.getAnnouncement();
 354                                 if (announcement != null)
 355                                         DeferredCommand.addCommand(new Command() {
 356                                                 public void execute() {
 357                                                         displayInformation(announcement);
 358                                                 }
 359                                         });
 360                         }
 361
 362                         @Override
 363                         public void onError(Throwable t) {
 364                                 GWT.log("Fetching user error", t);
 365                                 if(t instanceof RestException)
 366                                         GSS.get().displayError("No user found:"+((RestException)t).getHttpStatusText());
 367                                 else
 368                                         GSS.get().displayError("System error fetching user data:"+t.getMessage());
 369                                 authenticateUser();
 370                         }
 371                 };
 372                 DeferredCommand.addCommand(getUserCommand);
 373         }
 374
 375         /**
 376          * Parse and store the user credentials to the appropriate fields.
 377          */
 378         private void parseUserCredentials() {
 379                 Configuration conf = (Configuration) GWT.create(Configuration.class);
 380                 String cookie = conf.authCookie();
 381                 String auth = Cookies.getCookie(cookie);
 382                 String domain = Window.Location.getHostName();
 383                 String path = Window.Location.getPath();
 384                 Cookies.setCookie(cookie, "", null, domain, path, false);
 385                 if (auth == null) {
 386                         authenticateUser();
 387                         // Redundant, but silences warnings about possible auth NPE, below.
 388                         return;
 389                 }
 390                 int sepIndex = auth.indexOf(conf.cookieSeparator());
 391                 if (sepIndex == -1)
 392                         authenticateUser();
 393                 token = auth.substring(sepIndex + 1, auth.length());
 394                 final String username = auth.substring(0, sepIndex);
 395                 if (username == null)
 396                         authenticateUser();
 397
 398                 refreshWebDAVPassword();
 399
 400                 DeferredCommand.addCommand(new Command() {
 401                         public void execute() {
 402                                 fetchUser(username);
 403                         }
 404                 });
 405         }
 406
 407         /**
 408          * Redirect the user to the login page for authentication.
 409          */
 410         protected void authenticateUser() {
 411                 Configuration conf = (Configuration) GWT.create(Configuration.class);
 412                 Window.Location.assign(conf.loginUrl() + "?next=" + GWT.getModuleBaseURL());
 413         }
 414
 415         /**
 416          * Redirect the user to the logout page.
 417          */
 418         void logout() {
 419                 Configuration conf = (Configuration) GWT.create(Configuration.class);
 420                 Window.Location.assign(conf.logoutUrl());
 421         }
 422
 423         /**
 424          * Creates an HTML fragment that places an image & caption together, for use
 425          * in a group header.
 426          *
 427          * @param imageProto an image prototype for an image
 428          * @param caption the group caption
 429          * @return the header HTML fragment
 430          */
 431         private String createHeaderHTML(AbstractImagePrototype imageProto, String caption) {
 432                 String captionHTML = "<table class='caption' cellpadding='0' " +
 433                                 "cellspacing='0'>" + "<tr><td class='lcaption'>" + imageProto.getHTML() +
 434                                 "</td><td class='rcaption'><b style='white-space:nowrap'>&nbsp;" +
 435                                 caption + "</b></td></tr></table>";
 436                 return captionHTML;
 437         }
 438
 439         /*
 440          * (non-Javadoc)
 441          *
 442          * @see com.google.gwt.user.client.WindowResizeListener#onWindowResized(int,int)
 443          */
 444         public void onWindowResized(int width, int height) {
 445                 // Adjust the split panel to take up the available room in the window.
 446                 int newHeight = height - splitPanel.getAbsoluteTop() - 44;
 447                 if (newHeight < 1)
 448                         newHeight = 1;
 449                 splitPanel.setHeight("" + newHeight);
 450         }
 451
 452         public boolean isFileListShowing(){
 453                 int tab = inner.getTabBar().getSelectedTab();
 454                 if(tab == 0) return true;
 455                 return false;
 456         }
 457
 458         public boolean isSearchResultsShowing(){
 459                 int tab = inner.getTabBar().getSelectedTab();
 460                 if(tab == 2) return true;
 461                 return false;
 462         }
 463
 464         /**
 465          * Make the user list visible.
 466          */
 467         public void showUserList() {
 468                 inner.selectTab(1);
 469         }
 470
 471         /**
 472          * Make the file list visible.
 473          */
 474         public void showFileList() {
 475                 fileList.updateFileCache(false, true /*clear selection*/);
 476                 inner.selectTab(0);
 477         }
 478
 479         /**
 480          * Make the file list visible.
 481          * @param update
 482          */
 483         public void showFileList(boolean update) {
 484                 TreeItem currentFolder = getFolders().getCurrent();
 485                 if (currentFolder != null) {
 486                         List<FileResource> files = null;
 487                         Object cachedObject = currentFolder.getUserObject();
 488                         if (cachedObject instanceof FolderResource) {
 489                                 FolderResource folder = (FolderResource) cachedObject;
 490                                 files = folder.getFiles();
 491                         } else if (cachedObject instanceof TrashResource) {
 492                                 TrashResource folder = (TrashResource) cachedObject;
 493                                 files = folder.getFiles();
 494                         }
 495                         if (files != null)
 496                                 getFileList().setFiles(files);
 497                 }
 498                 fileList.updateFileCache(update, true /*clear selection*/);
 499                 inner.selectTab(0);
 500         }
 501
 502         /**
 503          * Make the search results visible.
 504          * @param query the search query string
 505          */
 506         public void showSearchResults(String query) {
 507                 searchResults.updateFileCache(query);
 508                 searchResults.updateCurrentlyShowingStats();
 509                 inner.selectTab(2);
 510         }
 511
 512         /**
 513          * Display the 'loading' indicator.
 514          */
 515         public void showLoadingIndicator() {
 516                 loading.center();
 517         }
 518
 519         /**
 520          * Hide the 'loading' indicator.
 521          */
 522         public void hideLoadingIndicator() {
 523                 loading.hide();
 524         }
 525
 526         /**
 527          * A native JavaScript method to reach out to the browser's window and
 528          * invoke its resizeTo() method.
 529          *
 530          * @param x the new width
 531          * @param y the new height
 532          */
 533         public static native void resizeTo(int x, int y) /*-{
 534          $wnd.resizeTo(x,y);
 535         }-*/;
 536
 537         /**
 538          * A helper method that returns true if the user's list is currently visible
 539          * and false if it is hidden.
 540          *
 541          * @return true if the user list is visible
 542          */
 543         public boolean isUserListVisible() {
 544                 return inner.getTabBar().getSelectedTab() == 1;
 545         }
 546
 547         /**
 548          * Display an error message.
 549          *
 550          * @param msg the message to display
 551          */
 552         public void displayError(String msg) {
 553                 messagePanel.displayError(msg);
 554         }
 555
 556         /**
 557          * Display a warning message.
 558          *
 559          * @param msg the message to display
 560          */
 561         public void displayWarning(String msg) {
 562                 messagePanel.displayWarning(msg);
 563         }
 564
 565         /**
 566          * Display an informational message.
 567          *
 568          * @param msg the message to display
 569          */
 570         public void displayInformation(String msg) {
 571                 messagePanel.displayInformation(msg);
 572         }
 573
 574         /**
 575          * Retrieve the folders.
 576          *
 577          * @return the folders
 578          */
 579         public Folders getFolders() {
 580                 return folders;
 581         }
 582
 583         /**
 584          * Retrieve the search.
 585          *
 586          * @return the search
 587          */
 588         Search getSearch() {
 589                 return search;
 590         }
 591
 592         /**
 593          * Retrieve the currentSelection.
 594          *
 595          * @return the currentSelection
 596          */
 597         public Object getCurrentSelection() {
 598                 return currentSelection;
 599         }
 600
 601         /**
 602          * Modify the currentSelection.
 603          *
 604          * @param newCurrentSelection the currentSelection to set
 605          */
 606         public void setCurrentSelection(Object newCurrentSelection) {
 607                 currentSelection = newCurrentSelection;
 608         }
 609
 610         /**
 611          * Retrieve the groups.
 612          *
 613          * @return the groups
 614          */
 615         public Groups getGroups() {
 616                 return groups;
 617         }
 618
 619         /**
 620          * Retrieve the fileList.
 621          *
 622          * @return the fileList
 623          */
 624         public FileList getFileList() {
 625                 return fileList;
 626         }
 627
 628         public SearchResults getSearchResults(){
 629                 return searchResults;
 630         }
 631
 632         /**
 633          * Retrieve the topPanel.
 634          *
 635          * @return the topPanel
 636          */
 637         TopPanel getTopPanel() {
 638                 return topPanel;
 639         }
 640
 641         /**
 642          * Retrieve the clipboard.
 643          *
 644          * @return the clipboard
 645          */
 646         public Clipboard getClipboard() {
 647                 return clipboard;
 648         }
 649
 650
 651         public StatusPanel getStatusPanel(){
 652                 return statusPanel;
 653         }
 654
 655
 656         /**
 657          * Retrieve the userDetailsPanel.
 658          *
 659          * @return the userDetailsPanel
 660          */
 661         public UserDetailsPanel getUserDetailsPanel() {
 662                 return userDetailsPanel;
 663         }
 664
 665         /**
 666          * Retrieve the dragController.
 667          *
 668          * @return the dragController
 669          */
 670         public PickupDragController getDragController() {
 671                 return dragController;
 672         }
 673
 674         public String getToken(){
 675                 return token;
 676         }
 677
 678         public String getWebDAVPassword() {
 679                 return webDAVPassword;
 680         }
 681
 682         public void removeGlassPanel(){
 683                 glassPanel.removeFromParent();
 684         }
 685
 686         /**
 687          * Retrieve the currentUserResource.
 688          *
 689          * @return the currentUserResource
 690          */
 691         public UserResource getCurrentUserResource() {
 692                 return currentUserResource;
 693         }
 694
 695         /**
 696          * Modify the currentUserResource.
 697          *
 698          * @param newUser the new currentUserResource
 699          */
 700         public void setCurrentUserResource(UserResource newUser) {
 701                 currentUserResource = newUser;
 702         }
 703
 704         public static native void preventIESelection() /*-{
 705         $doc.body.onselectstart = function () { return false; };
 706         }-*/;
 707
 708         public static native void enableIESelection() /*-{
 709                 if ($doc.body.onselectstart != null)
 710                         $doc.body.onselectstart = null;
 711         }-*/;
 712
 713         /**
 714          * @return the absolute path of the API root URL
 715          */
 716         public String getApiPath() {
 717                 Configuration conf = (Configuration) GWT.create(Configuration.class);
 718                 return GWT.getModuleBaseURL() + conf.apiPath();
 719         }
 720
 721         public void refreshWebDAVPassword() {
 722                 Configuration conf = (Configuration) GWT.create(Configuration.class);
 723                 String domain = Window.Location.getHostName();
 724                 String path = Window.Location.getPath();
 725                 String cookie = conf.webdavCookie();
 726                 webDAVPassword = Cookies.getCookie(cookie);
 727                 Cookies.setCookie(cookie, "", null, domain, path, false);
 728         }
 729
 730 }