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package org.apereo.cas.web.flow;

import org.apereo.cas.authentication.Credential;
import org.apereo.cas.authentication.adaptive.AdaptiveAuthenticationPolicy;
import org.apereo.cas.services.RegisteredServiceAccessStrategyUtils;
import org.apereo.cas.services.ServicesManager;
import org.apereo.cas.token.authentication.TokenCredential;
import org.apereo.cas.web.TokenRequestExtractor;
import org.apereo.cas.web.flow.actions.AbstractNonInteractiveCredentialsAction;
import org.apereo.cas.web.flow.resolver.CasDelegatingWebflowEventResolver;
import org.apereo.cas.web.flow.resolver.CasWebflowEventResolver;
import org.apereo.cas.web.support.WebUtils;

import lombok.extern.slf4j.Slf4j;
import lombok.val;
import org.apache.commons.lang3.StringUtils;
import org.springframework.webflow.execution.RequestContext;

/**
 * This is {@link TokenAuthenticationAction}.  This class represents an action in the webflow to retrieve
 * user information from an AES128 encrypted token. If the auth_token
 * parameter exists in the web request, it is used to create a new TokenCredential.
 *
 * @author Eric Pierce
 * @author Misagh Moayyed
 * @since 4.2.0
 */
@Slf4j
public class TokenAuthenticationAction extends AbstractNonInteractiveCredentialsAction {
    private final TokenRequestExtractor tokenRequestExtractor;
    private final ServicesManager servicesManager;

    public TokenAuthenticationAction(final CasDelegatingWebflowEventResolver initialAuthenticationAttemptWebflowEventResolver,
                                     final CasWebflowEventResolver serviceTicketRequestWebflowEventResolver,
                                     final AdaptiveAuthenticationPolicy adaptiveAuthenticationPolicy,
                                     final TokenRequestExtractor tokenRequestExtractor,
                                     final ServicesManager servicesManager) {
        super(initialAuthenticationAttemptWebflowEventResolver, serviceTicketRequestWebflowEventResolver, adaptiveAuthenticationPolicy);
        this.tokenRequestExtractor = tokenRequestExtractor;
        this.servicesManager = servicesManager;
    }

    @Override
    protected Credential constructCredentialsFromRequest(final RequestContext requestContext) {
        val request = WebUtils.getHttpServletRequestFromExternalWebflowContext(requestContext);
        val authTokenValue = this.tokenRequestExtractor.extract(request);
        val service = WebUtils.getService(requestContext);

        if (service != null && StringUtils.isNotBlank(authTokenValue)) {
            try {
                val registeredService = this.servicesManager.findServiceBy(service);
                RegisteredServiceAccessStrategyUtils.ensureServiceAccessIsAllowed(service, registeredService);

                val credential = new TokenCredential(authTokenValue, service);
                LOGGER.debug("Received token authentication request [{}] ", credential);
                return credential;
            } catch (final Exception e) {
                LOGGER.warn(e.getMessage(), e);
            }
        }
        return null;
    }
}