src/main/java/eu/etaxonomy/cdm/vaadin/view/RedirectToLoginView.java

   1 /**
   2 * Copyright (C) 2017 EDIT
   3 * European Distributed Institute of Taxonomy
   4 * http://www.e-taxonomy.eu
   5 *
   6 * The contents of this file are subject to the Mozilla Public License Version 1.1
   7 * See LICENSE.TXT at the top of this package for the full license terms.
   8 */
   9 package eu.etaxonomy.cdm.vaadin.view;
  10
  11 import org.springframework.beans.factory.annotation.Autowired;
  12 import org.springframework.beans.factory.config.ConfigurableBeanFactory;
  13 import org.springframework.context.annotation.Scope;
  14 import org.vaadin.spring.events.EventBus;
  15
  16 import com.vaadin.navigator.Navigator;
  17 import com.vaadin.navigator.View;
  18 import com.vaadin.navigator.ViewChangeListener.ViewChangeEvent;
  19 import com.vaadin.spring.annotation.SpringComponent;
  20 import com.vaadin.ui.Alignment;
  21 import com.vaadin.ui.Label;
  22 import com.vaadin.ui.VerticalLayout;
  23 import com.vaadin.ui.themes.ValoTheme;
  24
  25 import eu.etaxonomy.cdm.service.UserHelperAccess;
  26 import eu.etaxonomy.vaadin.ui.navigation.NavigationEvent;
  27 import eu.etaxonomy.vaadin.ui.navigation.NavigationManager;
  28
  29 /**
  30  * A {@link SpringViewProvider.setAccessDeniedViewClass(Class<? extends View> accessDeniedViewClass) accessDeniedViewClass}
  31  * can not be a view- or UI-scoped bean, since the view context is not set up at the time when the <code>accessDeniedViewClass</code>
  32  * is needed. Therefore the <code>RedirectToLoginView</code> is a scoped prototype bean which always available. Using the 'singleton'
  33  * scope should also work but is not a good idea for a login view.
  34  * The <code>RedirectToLoginView</code> redirects the request to the LoginView which then is in a correctly
  35  * set up view scope.
  36
  37  *
  38  * @author a.kohlbecker
  39  * @since Jul 13, 2017
  40  *
  41  */
  42 @SpringComponent
  43 @Scope(ConfigurableBeanFactory.SCOPE_PROTOTYPE)
  44 public class RedirectToLoginView extends VerticalLayout implements View {
  45
  46
  47     private static final long serialVersionUID = -8763747518841365925L;
  48
  49     @Autowired
  50     NavigationManager navigationManager;
  51
  52     @Autowired
  53     protected EventBus.UIEventBus uiEventBus;
  54
  55     public RedirectToLoginView() {
  56
  57         this.setWidth("100%");
  58         Label header = new Label("Access to this content is restricted");
  59         header.setStyleName(ValoTheme.LABEL_FAILURE);
  60         header.setWidthUndefined();
  61
  62         addComponent(header);
  63         setComponentAlignment(header, Alignment.MIDDLE_CENTER);
  64     }
  65
  66     /**
  67      * {@inheritDoc}
  68      */
  69     @Override
  70     public void enter(ViewChangeEvent event) {
  71
  72         if(!UserHelperAccess.userHelper().userIsAutheticated()){
  73             String currentState = ((Navigator)navigationManager).getState();
  74             // redirect to the login view and pass over the current state
  75             uiEventBus.publish(this, new NavigationEvent(LoginViewBean.NAME, currentState));
  76         }
  77     }
  78
  79 }