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/*
 * Copyright (C) 2005-2017 ManyDesigns srl.  All rights reserved.
 * http://www.manydesigns.com/
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 3 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package com.manydesigns.portofino.interceptors;

import com.manydesigns.portofino.buttons.ButtonsLogic;
import com.manydesigns.portofino.buttons.Guarded;
import net.sourceforge.stripes.action.ActionBean;
import net.sourceforge.stripes.action.ErrorResolution;
import net.sourceforge.stripes.action.Resolution;
import net.sourceforge.stripes.controller.ExecutionContext;
import net.sourceforge.stripes.controller.Interceptor;
import net.sourceforge.stripes.controller.Intercepts;
import net.sourceforge.stripes.controller.LifecycleStage;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.lang.reflect.Method;

/**
 * @author Paolo Predonzani     - [email protected]
 * @author Angelo Lupo          - [email protected]
 * @author Giampiero Granatella - [email protected]
 * @author Alessio Stalla       - [email protected]
 *
 * Runs guards on the selected action bean handler.
 */
@Intercepts(LifecycleStage.EventHandling)
public class GuardsInterceptor implements Interceptor {
    public static final String copyright =
            "Copyright (C) 2005-2017 ManyDesigns srl";

    public final static Logger logger = LoggerFactory.getLogger(GuardsInterceptor.class);

    private static final int CONFLICT = 409;

    public Resolution intercept(ExecutionContext context) throws Exception {
        ActionBean actionBean = context.getActionBean();
        Method handler = context.getHandler();

        logger.debug("Checking guards on {}", handler);
        if(ButtonsLogic.doGuardsPass(actionBean, handler)) {
            return context.proceed();
        } else {
            logger.warn("Operation not permitted. Method: " + context.getHandler());
            if(actionBean instanceof Guarded) {
                return ((Guarded) actionBean).guardsFailed(handler);
            } else {
                return new ErrorResolution(CONFLICT);
            }
        }
    }
}