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.updateCurrentlyShowingStats();
 281                                         break;
 282                                 case 1:
 283                                         groups.updateCurrentlyShowingStats();
 284                                         break;
 285                                 case 2:
 286                                         searchResults.updateCurrentlyShowingStats();
 287                                         break;
 288                         }
 289                         }
 290
 291                         public boolean onBeforeTabSelected(SourcesTabEvents sender, int tabIndex) {
 292                                 return true;
 293                         }
 294                 });
 295
 296                 // Add the left and right panels to the split panel.
 297                 splitPanel.setLeftWidget(folders);
 298                 splitPanel.setRightWidget(inner);
 299                 splitPanel.setSplitPosition("25%");
 300                 splitPanel.setSize("100%", "100%");
 301
 302                 // Create a dock panel that will contain the menu bar at the top,
 303                 // the shortcuts to the left, the status bar at the bottom and the
 304                 // right panel taking the rest.
 305                 VerticalPanel outer = new VerticalPanel();
 306                 outer.add(topPanel);
 307                 outer.add(searchStatus);
 308                 outer.add(messagePanel);
 309                 outer.add(splitPanel);
 310                 outer.add(statusPanel);
 311                 outer.setWidth("100%");
 312                 outer.setCellHorizontalAlignment(messagePanel, HasHorizontalAlignment.ALIGN_CENTER);
 313
 314                 outer.setSpacing(4);
 315
 316                 loading = new LoadingIndicator();
 317
 318                 // Hook the window resize event, so that we can adjust the UI.
 319                 Window.addWindowResizeListener(this);
 320
 321                 // Clear out the window's built-in margin, because we want to take
 322                 // advantage of the entire client area.
 323                 Window.setMargin("0px");
 324
 325                 // Finally, add the outer panel to the RootPanel, so that it will be
 326                 // displayed.
 327                 RootPanel.get().add(outer);
 328
 329                 // Call the window resized handler to get the initial sizes setup. Doing
 330                 // this in a deferred command causes it to occur after all widgets'
 331                 // sizes have been computed by the browser.
 332                 DeferredCommand.addCommand(new Command() {
 333                         public void execute() {
 334                                 onWindowResized(Window.getClientWidth(), Window.getClientHeight());
 335                         }
 336                 });
 337         }
 338
 339         /**
 340          * Fetches the User object for the specified username.
 341          *
 342          * @param username the username of the user
 343          */
 344         private void fetchUser(final String username) {
 345                 String path = getApiPath() + username + "/";
 346                 GetCommand<UserResource> getUserCommand = new GetCommand<UserResource>(UserResource.class, username, path){
 347
 348                         @Override
 349                         public void onComplete() {
 350                                 currentUserResource = getResult();
 351                                 final String announcement = currentUserResource.getAnnouncement();
 352                                 if (announcement != null)
 353                                         DeferredCommand.addCommand(new Command() {
 354                                                 public void execute() {
 355                                                         displayInformation(announcement);
 356                                                 }
 357                                         });
 358                         }
 359
 360                         @Override
 361                         public void onError(Throwable t) {
 362                                 GWT.log("Fetching user error", t);
 363                                 if(t instanceof RestException)
 364                                         GSS.get().displayError("No user found:"+((RestException)t).getHttpStatusText());
 365                                 else
 366                                         GSS.get().displayError("System error fetching user data:"+t.getMessage());
 367                                 authenticateUser();
 368                         }
 369                 };
 370                 DeferredCommand.addCommand(getUserCommand);
 371         }
 372
 373         /**
 374          * Parse and store the user credentials to the appropriate fields.
 375          */
 376         private void parseUserCredentials() {
 377                 Configuration conf = (Configuration) GWT.create(Configuration.class);
 378                 String cookie = conf.authCookie();
 379                 String auth = Cookies.getCookie(cookie);
 380                 String domain = Window.Location.getHostName();
 381                 String path = Window.Location.getPath();
 382                 Cookies.setCookie(cookie, "", null, domain, path, false);
 383                 if (auth == null) {
 384                         authenticateUser();
 385                         // Redundant, but silences warnings about possible auth NPE, below.
 386                         return;
 387                 }
 388                 int sepIndex = auth.indexOf(conf.cookieSeparator());
 389                 if (sepIndex == -1)
 390                         authenticateUser();
 391                 token = auth.substring(sepIndex + 1, auth.length());
 392                 final String username = auth.substring(0, sepIndex);
 393                 if (username == null)
 394                         authenticateUser();
 395
 396                 refreshWebDAVPassword();
 397
 398                 DeferredCommand.addCommand(new Command() {
 399                         public void execute() {
 400                                 fetchUser(username);
 401                         }
 402                 });
 403         }
 404
 405         /**
 406          * Redirect the user to the login page for authentication.
 407          */
 408         protected void authenticateUser() {
 409                 Configuration conf = (Configuration) GWT.create(Configuration.class);
 410                 Window.Location.assign(conf.loginUrl() + "?next=" + GWT.getModuleBaseURL());
 411         }
 412
 413         /**
 414          * Redirect the user to the logout page.
 415          */
 416         void logout() {
 417                 Configuration conf = (Configuration) GWT.create(Configuration.class);
 418                 Window.Location.assign(conf.logoutUrl());
 419         }
 420
 421         /**
 422          * Creates an HTML fragment that places an image & caption together, for use
 423          * in a group header.
 424          *
 425          * @param imageProto an image prototype for an image
 426          * @param caption the group caption
 427          * @return the header HTML fragment
 428          */
 429         private String createHeaderHTML(AbstractImagePrototype imageProto, String caption) {
 430                 String captionHTML = "<table class='caption' cellpadding='0' " +
 431                                 "cellspacing='0'>" + "<tr><td class='lcaption'>" + imageProto.getHTML() +
 432                                 "</td><td class='rcaption'><b style='white-space:nowrap'>&nbsp;" +
 433                                 caption + "</b></td></tr></table>";
 434                 return captionHTML;
 435         }
 436
 437         /*
 438          * (non-Javadoc)
 439          *
 440          * @see com.google.gwt.user.client.WindowResizeListener#onWindowResized(int,int)
 441          */
 442         public void onWindowResized(int width, int height) {
 443                 // Adjust the split panel to take up the available room in the window.
 444                 int newHeight = height - splitPanel.getAbsoluteTop() - 44;
 445                 if (newHeight < 1)
 446                         newHeight = 1;
 447                 splitPanel.setHeight("" + newHeight);
 448         }
 449
 450         public boolean isFileListShowing(){
 451                 int tab = inner.getTabBar().getSelectedTab();
 452                 if(tab == 0) return true;
 453                 return false;
 454         }
 455
 456         public boolean isSearchResultsShowing(){
 457                 int tab = inner.getTabBar().getSelectedTab();
 458                 if(tab == 2) return true;
 459                 return false;
 460         }
 461
 462         /**
 463          * Make the user list visible.
 464          */
 465         public void showUserList() {
 466                 inner.selectTab(1);
 467         }
 468
 469         /**
 470          * Make the file list visible.
 471          */
 472         public void showFileList() {
 473                 fileList.updateFileCache(false, true /*clear selection*/);
 474                 inner.selectTab(0);
 475         }
 476
 477         /**
 478          * Make the file list visible.
 479          * @param update
 480          */
 481         public void showFileList(boolean update) {
 482                 TreeItem currentFolder = getFolders().getCurrent();
 483                 if (currentFolder != null) {
 484                         List<FileResource> files = null;
 485                         Object cachedObject = currentFolder.getUserObject();
 486                         if (cachedObject instanceof FolderResource) {
 487                                 FolderResource folder = (FolderResource) cachedObject;
 488                                 files = folder.getFiles();
 489                         } else if (cachedObject instanceof TrashResource) {
 490                                 TrashResource folder = (TrashResource) cachedObject;
 491                                 files = folder.getFiles();
 492                         }
 493                         if (files != null)
 494                                 getFileList().setFiles(files);
 495                 }
 496                 fileList.updateFileCache(update, true /*clear selection*/);
 497                 inner.selectTab(0);
 498         }
 499
 500         /**
 501          * Make the search results visible.
 502          * @param query the search query string
 503          */
 504         public void showSearchResults(String query) {
 505                 searchResults.updateFileCache(query);
 506                 searchResults.updateCurrentlyShowingStats();
 507                 inner.selectTab(2);
 508         }
 509
 510         /**
 511          * Display the 'loading' indicator.
 512          */
 513         public void showLoadingIndicator() {
 514                 loading.center();
 515         }
 516
 517         /**
 518          * Hide the 'loading' indicator.
 519          */
 520         public void hideLoadingIndicator() {
 521                 loading.hide();
 522         }
 523
 524         /**
 525          * A native JavaScript method to reach out to the browser's window and
 526          * invoke its resizeTo() method.
 527          *
 528          * @param x the new width
 529          * @param y the new height
 530          */
 531         public static native void resizeTo(int x, int y) /*-{
 532          $wnd.resizeTo(x,y);
 533         }-*/;
 534
 535         /**
 536          * A helper method that returns true if the user's list is currently visible
 537          * and false if it is hidden.
 538          *
 539          * @return true if the user list is visible
 540          */
 541         public boolean isUserListVisible() {
 542                 return inner.getTabBar().getSelectedTab() == 1;
 543         }
 544
 545         /**
 546          * Display an error message.
 547          *
 548          * @param msg the message to display
 549          */
 550         public void displayError(String msg) {
 551                 messagePanel.displayError(msg);
 552         }
 553
 554         /**
 555          * Display a warning message.
 556          *
 557          * @param msg the message to display
 558          */
 559         public void displayWarning(String msg) {
 560                 messagePanel.displayWarning(msg);
 561         }
 562
 563         /**
 564          * Display an informational message.
 565          *
 566          * @param msg the message to display
 567          */
 568         public void displayInformation(String msg) {
 569                 messagePanel.displayInformation(msg);
 570         }
 571
 572         /**
 573          * Retrieve the folders.
 574          *
 575          * @return the folders
 576          */
 577         public Folders getFolders() {
 578                 return folders;
 579         }
 580
 581         /**
 582          * Retrieve the search.
 583          *
 584          * @return the search
 585          */
 586         Search getSearch() {
 587                 return search;
 588         }
 589
 590         /**
 591          * Retrieve the currentSelection.
 592          *
 593          * @return the currentSelection
 594          */
 595         public Object getCurrentSelection() {
 596                 return currentSelection;
 597         }
 598
 599         /**
 600          * Modify the currentSelection.
 601          *
 602          * @param newCurrentSelection the currentSelection to set
 603          */
 604         public void setCurrentSelection(Object newCurrentSelection) {
 605                 currentSelection = newCurrentSelection;
 606         }
 607
 608         /**
 609          * Retrieve the groups.
 610          *
 611          * @return the groups
 612          */
 613         public Groups getGroups() {
 614                 return groups;
 615         }
 616
 617         /**
 618          * Retrieve the fileList.
 619          *
 620          * @return the fileList
 621          */
 622         public FileList getFileList() {
 623                 return fileList;
 624         }
 625
 626         public SearchResults getSearchResults(){
 627                 return searchResults;
 628         }
 629
 630         /**
 631          * Retrieve the topPanel.
 632          *
 633          * @return the topPanel
 634          */
 635         TopPanel getTopPanel() {
 636                 return topPanel;
 637         }
 638
 639         /**
 640          * Retrieve the clipboard.
 641          *
 642          * @return the clipboard
 643          */
 644         public Clipboard getClipboard() {
 645                 return clipboard;
 646         }
 647
 648
 649         public StatusPanel getStatusPanel(){
 650                 return statusPanel;
 651         }
 652
 653
 654         /**
 655          * Retrieve the userDetailsPanel.
 656          *
 657          * @return the userDetailsPanel
 658          */
 659         public UserDetailsPanel getUserDetailsPanel() {
 660                 return userDetailsPanel;
 661         }
 662
 663         /**
 664          * Retrieve the dragController.
 665          *
 666          * @return the dragController
 667          */
 668         public PickupDragController getDragController() {
 669                 return dragController;
 670         }
 671
 672         public String getToken(){
 673                 return token;
 674         }
 675
 676         public String getWebDAVPassword() {
 677                 return webDAVPassword;
 678         }
 679
 680         public void removeGlassPanel(){
 681                 glassPanel.removeFromParent();
 682         }
 683
 684         /**
 685          * Retrieve the currentUserResource.
 686          *
 687          * @return the currentUserResource
 688          */
 689         public UserResource getCurrentUserResource() {
 690                 return currentUserResource;
 691         }
 692
 693         /**
 694          * Modify the currentUserResource.
 695          *
 696          * @param newUser the new currentUserResource
 697          */
 698         public void setCurrentUserResource(UserResource newUser) {
 699                 currentUserResource = newUser;
 700         }
 701
 702         public static native void preventIESelection() /*-{
 703         $doc.body.onselectstart = function () { return false; };
 704         }-*/;
 705
 706         public static native void enableIESelection() /*-{
 707                 if ($doc.body.onselectstart != null)
 708                         $doc.body.onselectstart = null;
 709         }-*/;
 710
 711         /**
 712          * @return the absolute path of the API root URL
 713          */
 714         public String getApiPath() {
 715                 Configuration conf = (Configuration) GWT.create(Configuration.class);
 716                 return GWT.getModuleBaseURL() + conf.apiPath();
 717         }
 718
 719         public void refreshWebDAVPassword() {
 720                 Configuration conf = (Configuration) GWT.create(Configuration.class);
 721                 String domain = Window.Location.getHostName();
 722                 String path = Window.Location.getPath();
 723                 String cookie = conf.webdavCookie();
 724                 webDAVPassword = Cookies.getCookie(cookie);
 725                 Cookies.setCookie(cookie, "", null, domain, path, false);
 726         }
 727
 728 }