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/*
 * Licensed to Apereo under one or more contributor license
 * agreements. See the NOTICE file distributed with this work
 * for additional information regarding copyright ownership.
 * Apereo licenses this file to you 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 the following location:
 *
 *   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.jasig.cas.web.flow;

import org.jasig.cas.authentication.principal.Service;
import org.jasig.cas.authentication.principal.SimpleWebApplicationServiceImpl;
import org.jasig.cas.logout.LogoutRequest;
import org.jasig.cas.logout.LogoutRequestStatus;
import org.jasig.cas.services.RegisteredService;
import org.jasig.cas.services.ServicesManager;
import org.jasig.cas.web.support.WebUtils;
import org.springframework.webflow.execution.Event;
import org.springframework.webflow.execution.RequestContext;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.validation.constraints.NotNull;
import java.util.List;

/**
 * Action to delete the TGT and the appropriate cookies.
 * It also performs the back-channel SLO on the services accessed by the user during its browsing.
 * After this back-channel SLO, a front-channel SLO can be started if some services require it.
 * The final logout page or a redirection url is also computed in this action.
 *
 * @author Scott Battaglia
 * @author Jerome Leleu
 * @since 3.0.0
 */
public final class LogoutAction extends AbstractLogoutAction {

    /** The services manager. */
    @NotNull
    private ServicesManager servicesManager;

    /**
     * Boolean to determine if we will redirect to any url provided in the
     * service request parameter.
     */
    private boolean followServiceRedirects;

    @Override
    protected Event doInternalExecute(final HttpServletRequest request, final HttpServletResponse response,
            final RequestContext context) throws Exception {

        boolean needFrontSlo = false;
        putLogoutIndex(context, 0);
        final List logoutRequests = WebUtils.getLogoutRequests(context);
        if (logoutRequests != null) {
            for (final LogoutRequest logoutRequest : logoutRequests) {
                // if some logout request must still be attempted
                if (logoutRequest.getStatus() == LogoutRequestStatus.NOT_ATTEMPTED) {
                    needFrontSlo = true;
                    break;
                }
            }
        }

        final String service = request.getParameter("service");
        if (this.followServiceRedirects && service != null) {
            final Service webAppService = new SimpleWebApplicationServiceImpl(service);
            final RegisteredService rService = this.servicesManager.findServiceBy(webAppService);

            if (rService != null && rService.getAccessStrategy().isServiceAccessAllowed()) {
                context.getFlowScope().put("logoutRedirectUrl", service);
            }
        }

        // there are some front services to logout, perform front SLO
        if (needFrontSlo) {
            return new Event(this, FRONT_EVENT);
        } else {
            // otherwise, finish the logout process
            return new Event(this, FINISH_EVENT);
        }
    }

    public void setFollowServiceRedirects(final boolean followServiceRedirects) {
        this.followServiceRedirects = followServiceRedirects;
    }

    public void setServicesManager(final ServicesManager servicesManager) {
        this.servicesManager = servicesManager;
    }
}