com.tysanclan.site.projectewok.auth.TysanSecurity.java Source code

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Here is the source code for com.tysanclan.site.projectewok.auth.TysanSecurity.java

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/**
 * Tysan Clan Website
 * Copyright (C) 2008-2013 Jeroen Steenbeeke and Ties van de Ven
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.tysanclan.site.projectewok.auth;

import java.util.Arrays;

import org.apache.wicket.Component;
import org.apache.wicket.RestartResponseAtInterceptPageException;
import org.apache.wicket.application.IComponentInstantiationListener;

import com.tysanclan.site.projectewok.TysanSession;
import com.tysanclan.site.projectewok.entities.User;
import com.tysanclan.site.projectewok.pages.AccessDeniedPage;
import com.tysanclan.site.projectewok.util.MemberUtil;

/**
 * Component instantiation listener that takes care of security checks for
 * various pages and components
 * 
 * @author Jeroen Steenbeeke
 */
public class TysanSecurity implements IComponentInstantiationListener {
    /**
     * Create a new security object
     */
    public TysanSecurity() {
    }

    /**
     * Checks whether or not the current user has access to the given component
     * 
     * @param componentClass
     *            The class of the component to instantiate
     * @return <code>true</code> if the user is authorized, <code>false</code>
     *         otherwise
     */
    public boolean authorize(Class<? extends Component> componentClass) {
        TysanSession session = TysanSession.get();

        // Check for rank-based security policy
        TysanRankSecured sec1 = componentClass.getAnnotation(TysanRankSecured.class);
        // Check for member-based security policy
        TysanMemberSecured sec2 = componentClass.getAnnotation(TysanMemberSecured.class);
        // Check for non-member based security policy
        TysanNonMemberSecured sec3 = componentClass.getAnnotation(TysanNonMemberSecured.class);
        // Check for a logged in user-based security policy
        TysanLoginSecured sec4 = componentClass.getAnnotation(TysanLoginSecured.class);

        // Get the current user
        User u = (session != null) ? session.getUser() : null;

        if (u != null) {
            // There is a user, check for security policies
            if (sec1 != null) {
                // Check if the user has the correct rank
                return Arrays.asList(sec1.value()).contains(u.getRank());
            } else if (sec2 != null) {
                // Check if the user is a Tysan member
                return MemberUtil.isMember(u);
            } else if (sec3 != null) {
                // Check if the user is not a Tysan member
                return !MemberUtil.isMember(u);
            } else if (sec4 != null) {
                // User is logged in
                return true;
            }
        } else if (sec1 != null || sec2 != null || sec3 != null || sec4 != null) {
            // No user, but existing security policy
            return false;
        }

        // No security policy
        return true;
    }

    /**
     * @see org.apache.wicket.application.IComponentInstantiationListener#onInstantiation(org.apache.wicket.Component)
     */
    @Override
    public void onInstantiation(Component component) {
        // Check authorization
        if (!authorize(component.getClass())) {
            // If not authorized, redirect to access denied page
            throw new RestartResponseAtInterceptPageException(AccessDeniedPage.class);
        }

    }
}