org.vaadin.spring.samples.security.managed.SingleSecuredUI.java Source code

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Here is the source code for org.vaadin.spring.samples.security.managed.SingleSecuredUI.java

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/*
 * Copyright 2015 The original authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.vaadin.spring.samples.security.managed;

import com.vaadin.annotations.Push;
import com.vaadin.annotations.Theme;
import com.vaadin.server.DefaultErrorHandler;
import com.vaadin.server.VaadinRequest;
import com.vaadin.spring.annotation.SpringUI;
import com.vaadin.ui.Notification;
import com.vaadin.ui.UI;
import com.vaadin.ui.themes.ValoTheme;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationContext;
import org.vaadin.spring.events.EventBus;
import org.vaadin.spring.events.annotation.EventBusListenerMethod;
import org.vaadin.spring.security.VaadinSecurity;
import org.vaadin.spring.security.util.SuccessfulLoginEvent;
import org.vaadin.spring.security.util.SecurityExceptionUtils;

/**
 * Main application UI that shows either the {@link org.vaadin.spring.samples.security.managed.MainScreen} or the {@link org.vaadin.spring.samples.security.managed.LoginScreen},
 * depending on whether there is an authenticated user or not. Also note that the UI is using web socket based push.
 *
 * @author Petter Holmstrm (petter@vaadin.com)
 */
@SpringUI
@Theme(ValoTheme.THEME_NAME)
@Push
public class SingleSecuredUI extends UI {

    @Autowired
    ApplicationContext applicationContext;

    @Autowired
    VaadinSecurity vaadinSecurity;

    @Autowired
    EventBus.SessionEventBus eventBus;

    @Override
    protected void init(VaadinRequest request) {
        getPage().setTitle("Vaadin Managed Security Demo");
        // Let's register a custom error handler to make the 'access denied' messages a bit friendlier.
        setErrorHandler(new DefaultErrorHandler() {
            @Override
            public void error(com.vaadin.server.ErrorEvent event) {
                if (SecurityExceptionUtils.isAccessDeniedException(event.getThrowable())) {
                    Notification.show("Sorry, you don't have access to do that.");
                } else {
                    super.error(event);
                }
            }
        });
        if (vaadinSecurity.isAuthenticated()) {
            showMainScreen();
        } else {
            showLoginScreen(request.getParameter("goodbye") != null);
        }
    }

    @Override
    public void attach() {
        super.attach();
        eventBus.subscribe(this);
    }

    @Override
    public void detach() {
        eventBus.unsubscribe(this);
        super.detach();
    }

    private void showLoginScreen(boolean loggedOut) {
        LoginScreen loginScreen = applicationContext.getBean(LoginScreen.class);
        loginScreen.setLoggedOut(loggedOut);
        setContent(loginScreen);
    }

    private void showMainScreen() {
        setContent(applicationContext.getBean(MainScreen.class));
    }

    @EventBusListenerMethod
    void onLogin(SuccessfulLoginEvent loginEvent) {
        if (loginEvent.getSource().equals(this)) {
            access(new Runnable() {
                @Override
                public void run() {
                    showMainScreen();
                }
            });
        } else {
            // We cannot inject the Main Screen if the event was fired from another UI, since that UI's scope would be active
            // and the main screen for that UI would be injected. Instead, we just reload the page and let the init(...) method
            // do the work for us.
            getPage().reload();
        }
    }
}