/*
 * Copyright (c) 2010-2014 Evolveum
 *
 * Licensed 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
 *
 *     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 com.evolveum.midpoint.web.component;

import com.evolveum.midpoint.security.api.SecurityEnforcer;
import org.apache.commons.lang.Validate;
import org.apache.wicket.Application;
import org.apache.wicket.Session;
import org.apache.wicket.ThreadContext;
import org.springframework.security.core.Authentication;

import java.util.concurrent.Callable;

/**
 * @author lazyman
 */
public abstract class SecurityContextAwareCallable<V> implements Callable<V> {

    private SecurityEnforcer enforcer;
    private Authentication authentication;

    protected SecurityContextAwareCallable(SecurityEnforcer enforcer, Authentication authentication) {
        Validate.notNull(enforcer, "Security enforcer must not be null.");

        this.enforcer = enforcer;
        this.authentication = authentication;
    }

    @Override
    public final V call() throws Exception {
        enforcer.setupPreAuthenticatedSecurityContext(authentication);

        try {
            return callWithContextPrepared();
        } finally {
            enforcer.setupPreAuthenticatedSecurityContext((Authentication) null);
            //todo cleanup security context
        }
    }

	protected void setupContext(Application application, Session session) {
		if (!Application.exists() && application != null) {
			ThreadContext.setApplication(application);
		}
		if (!Session.exists() && session != null) {
			ThreadContext.setSession(session);
		}
	}

    public abstract V callWithContextPrepared() throws Exception;
}