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package org.apereo.cas.web.flow;

import org.apereo.cas.configuration.CasConfigurationProperties;
import org.apereo.cas.web.flow.configurer.AbstractCasWebflowConfigurer;

import lombok.val;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.webflow.definition.registry.FlowDefinitionRegistry;
import org.springframework.webflow.engine.builder.support.FlowBuilderServices;

/**
 * The {@link TrustedAuthenticationWebflowConfigurer} is responsible for
 * adjusting the CAS webflow context for trusted authn integration.
 *
 * @author Misagh Moayyed
 * @since 4.2
 */
public class TrustedAuthenticationWebflowConfigurer extends AbstractCasWebflowConfigurer {

    private static final String ACTION_ID_REMOTE_USER_AUTHENTICATION_ACTION = "remoteUserAuthenticationAction";

    public TrustedAuthenticationWebflowConfigurer(final FlowBuilderServices flowBuilderServices,
                                                  final FlowDefinitionRegistry loginFlowDefinitionRegistry,
                                                  final ConfigurableApplicationContext applicationContext,
                                                  final CasConfigurationProperties casProperties) {
        super(flowBuilderServices, loginFlowDefinitionRegistry, applicationContext, casProperties);
    }

    @Override
    protected void doInitialize() {
        val flow = getLoginFlow();
        if (flow != null) {
            val action = createEvaluateAction(ACTION_ID_REMOTE_USER_AUTHENTICATION_ACTION);
            val actionState = createActionState(flow, CasWebflowConstants.ACTION_ID_REMOTE_TRUSTED_AUTHENTICATION, action);
            createTransitionForState(actionState, CasWebflowConstants.TRANSITION_ID_SUCCESS, CasWebflowConstants.STATE_ID_CREATE_TICKET_GRANTING_TICKET);
            createTransitionForState(actionState, CasWebflowConstants.TRANSITION_ID_GENERATE_SERVICE_TICKET, CasWebflowConstants.STATE_ID_GENERATE_SERVICE_TICKET);
            val currentStartState = getStartState(flow).getId();
            createTransitionForState(actionState, CasWebflowConstants.TRANSITION_ID_ERROR, currentStartState);
            createTransitionForState(actionState, CasWebflowConstants.TRANSITION_ID_AUTHENTICATION_FAILURE, CasWebflowConstants.STATE_ID_HANDLE_AUTHN_FAILURE);
            actionState.getExitActionList().add(createEvaluateAction(CasWebflowConstants.ACTION_ID_CLEAR_WEBFLOW_CREDENTIALS));

            setStartState(flow, actionState);
        }
    }
}