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/**
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* Copyright (C) 2017 EDIT
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* European Distributed Institute of Taxonomy
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* http://www.e-taxonomy.eu
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*
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* The contents of this file are subject to the Mozilla Public License Version 1.1
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* See LICENSE.TXT at the top of this package for the full license terms.
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*/
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package eu.etaxonomy.cdm.vaadin.view;
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import java.util.List;
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import org.apache.commons.lang.StringUtils;
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import org.apache.log4j.Logger;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.security.authentication.AuthenticationManager;
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import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
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import org.springframework.security.core.Authentication;
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import org.springframework.security.core.AuthenticationException;
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import org.vaadin.spring.events.Event;
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import org.vaadin.spring.events.EventBus;
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import org.vaadin.spring.events.EventBus.ViewEventBus;
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import org.vaadin.spring.events.EventBusListener;
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import com.vaadin.spring.annotation.SpringComponent;
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import com.vaadin.spring.annotation.ViewScope;
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import eu.etaxonomy.cdm.vaadin.event.AuthenticationAttemptEvent;
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import eu.etaxonomy.cdm.vaadin.event.AuthenticationSuccessEvent;
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import eu.etaxonomy.vaadin.mvp.AbstractPresenter;
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import eu.etaxonomy.vaadin.ui.navigation.NavigationEvent;
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import eu.etaxonomy.vaadin.ui.navigation.NavigationManager;
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/**
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* The {@link LoginView} is used as replacement view in the scope of other views.
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* Therefore the LoginPresenter must be in <b>UIScope</b> so that the LoginPresenter
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* is available to all Views.
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* <p>
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* The LoginPresenter offers a <b>auto login feature for developers</b>. To activate the auto login
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* you need to provide the <code>user name</code> and <code>password</code> using the environment variables
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* <code>cdm-vaadin.login.usr</code> and <code>cdm-vaadin.login.pwd</code>, e.g.:
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* <pre>
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* -Dcdm-vaadin.login.usr=admin -Dcdm-vaadin.login.pwd=00000
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* </pre>
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*
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* @author a.kohlbecker
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* @since Apr 25, 2017
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*
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*/
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@SpringComponent
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@ViewScope
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public class LoginPresenter extends AbstractPresenter<LoginView> implements EventBusListener<AuthenticationAttemptEvent> {
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private static final long serialVersionUID = 4020699735656994791L;
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private static final Logger log = Logger.getLogger(LoginPresenter.class);
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private final static String PROPNAME_USER = "cdm-vaadin.login.usr";
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private final static String PROPNAME_PASSWORD = "cdm-vaadin.login.pwd";
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private String redirectToState;
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protected EventBus.UIEventBus uiEventBus;
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/**
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* {@inheritDoc}
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*/
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@Override
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protected void eventViewBusSubscription(ViewEventBus viewEventBus) {
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// not listening to view scope events
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}
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@Autowired
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protected void setUIEventBus(EventBus.UIEventBus uiEventBus){
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this.uiEventBus = uiEventBus;
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uiEventBus.subscribe(this);
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}
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public boolean authenticate(String userName, String password) {
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getView().clearMessage();
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UsernamePasswordAuthenticationToken token = new UsernamePasswordAuthenticationToken(userName, password);
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AuthenticationManager authenticationManager = getRepo().getAuthenticationManager();
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try {
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Authentication authentication = authenticationManager.authenticate(token);
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if(authentication != null && authentication.isAuthenticated()) {
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log.debug("user '" + userName + "' authenticated");
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currentSecurityContext().setAuthentication(authentication);
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if(NavigationManager.class.isAssignableFrom(getNavigationManager().getClass())){
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uiEventBus.publish(this, new AuthenticationSuccessEvent(userName));
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log.debug("redirecting to " + redirectToState);
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uiEventBus.publish(this, new NavigationEvent(redirectToState));
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}
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}
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} catch (AuthenticationException e){
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getView().showErrorMessage("Login failed! Please check your username and password.");
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}
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return false;
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public void handleViewEntered() {
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List<String> redirectToStateTokens = getNavigationManager().getCurrentViewParameters();
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String currentViewName = getNavigationManager().getCurrentViewName();
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if(currentViewName.equals(LoginViewBean.NAME) && redirectToStateTokens.isEmpty()){
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// login view is shown in turn to an explicit login request of the user (e.g. login button pressed)
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// use the redirectToStateTokens 1-n as redirectToState
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//FIXME implement : redirectToState = UserView.NAME
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} else {
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// the login view is shown instead of the requested view for which the user needs to login
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redirectToState = String.join("/", redirectToStateTokens);
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}
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// attempt to auto login
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if(StringUtils.isNotEmpty(System.getProperty(PROPNAME_USER)) && StringUtils.isNotEmpty(System.getProperty(PROPNAME_PASSWORD))){
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log.warn("Performing autologin with user " + System.getProperty(PROPNAME_USER));
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authenticate(System.getProperty(PROPNAME_USER), System.getProperty(PROPNAME_PASSWORD));
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}
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}
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@Override
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public void onEvent(Event<AuthenticationAttemptEvent> event) {
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authenticate(event.getPayload().getUserName(), getView().getLoginDialog().getPassword().getValue());
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}
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}
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