dynamicredirectviewselector.java

CAS在Tomcat中实现单点登录项目,单点登录（Single Sign On , 简称 SSO ）是目前比较流行的服务于企业业务整合的解决方案之一

/*
 * Copyright 2007 The JA-SIG Collaborative. All rights reserved. See license
 * distributed with this file and available online at
 * http://www.ja-sig.org/products/cas/overview/license/
 */
package org.jasig.cas.web.flow;

import java.util.HashMap;
import java.util.Map;

import org.jasig.cas.authentication.principal.Response;
import org.jasig.cas.authentication.principal.WebApplicationService;
import org.jasig.cas.web.support.ArgumentExtractor;
import org.jasig.cas.web.support.WebUtils;
import org.springframework.webflow.engine.ViewSelector;
import org.springframework.webflow.execution.RequestContext;
import org.springframework.webflow.execution.ViewSelection;
import org.springframework.webflow.execution.support.ApplicationView;
import org.springframework.webflow.execution.support.ExternalRedirect;

/**
 * ViewSelector that grabs the redirect URL from the proper
 * {@link ArgumentExtractor}.
 * 
 * @author Scott Battaglia
 * @version $Revision: 42063 $ $Date: 2007-06-11 15:52:26 -0400 (Mon, 11 Jun 2007) $
 * @since 3.1
 */
public final class DynamicRedirectViewSelector implements ViewSelector {

    public ViewSelection makeRefreshSelection(final RequestContext context) {
        return makeEntrySelection(context);
    }

    public boolean isEntrySelectionRenderable(final RequestContext request) {
        return false;
    }

    public ViewSelection makeEntrySelection(final RequestContext request) {
        final WebApplicationService service = WebUtils.getService(request);
        final String ticket = WebUtils.getServiceTicketFromRequestScope(request);
        final Response serviceResponse = service.getResponse(ticket);
            
        switch (serviceResponse.getResponseType()) {
            case POST:
                final Map<String, Object> model = new HashMap<String, Object>();
                model.put("parameters", serviceResponse.getAttributes());
                model.put("originalUrl", service.getId());
                return new ApplicationView("postResponseView", model);
                
            default:
                return new ExternalRedirect(service.getResponse(ticket).getUrl());
        }
    }
}