/*
    JSPWiki - a JSP-based WikiWiki clone.

    Copyright (C) 2001-2002 Janne Jalkanen (Janne.Jalkanen@iki.fi)

    This program 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 2.1 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 Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package com.ecyrd.jspwiki.tags;

import java.io.IOException;

import com.ecyrd.jspwiki.WikiEngine;
import com.ecyrd.jspwiki.WikiPage;
import com.ecyrd.jspwiki.WikiProvider;
import com.ecyrd.jspwiki.auth.AuthorizationManager;
import com.ecyrd.jspwiki.auth.UserProfile;


/**
 * Tells if a page may be edited.  This tag takes care of all possibilities, user permissions, page
 * version, etc.
 *
 * @author Janne Jalkanen
 *
 * @since 2.0
 */
public class PermissionTag
        extends WikiTagBase
{
    /** DOCUMENT ME! */
    private String m_permission;

    /**
     * DOCUMENT ME!
     *
     * @param permission DOCUMENT ME!
     */
    public void setPermission(String permission)
    {
        m_permission = permission;
    }

    /**
     * DOCUMENT ME!
     *
     * @return DOCUMENT ME!
     *
     * @throws IOException DOCUMENT ME!
     */
    public final int doWikiStartTag()
            throws IOException
    {
        WikiEngine engine = m_wikiContext.getEngine();
        WikiPage page = m_wikiContext.getPage();
        AuthorizationManager mgr = engine.getAuthorizationManager();
        boolean gotPermission = false;
        UserProfile userprofile = m_wikiContext.getCurrentUser();

        if (page != null)
        {
            //
            //  Edit tag also checks that we're not trying to edit an
            //  old version: they cannot be edited.
            //
            if ("edit".equals(m_permission))
            {
                WikiPage latest = engine.getPage(page.getName());

                if (
                    (page.getVersion() != WikiProvider.LATEST_VERSION)
                                && (latest.getVersion() != page.getVersion()))
                {
                    return SKIP_BODY;
                }
            }

            gotPermission = mgr.checkPermission(page, userprofile, m_permission);
        }

        return gotPermission
                ? EVAL_BODY_INCLUDE
                : SKIP_BODY;
    }
}

/*
    JSPWiki - a JSP-based WikiWiki clone.

    Copyright (C) 2001-2002 Janne Jalkanen (Janne.Jalkanen@iki.fi)

    This program 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 2.1 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 Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package com.ecyrd.jspwiki.tags;

import java.io.IOException;

import com.ecyrd.jspwiki.WikiEngine;
import com.ecyrd.jspwiki.WikiPage;
import com.ecyrd.jspwiki.WikiProvider;
import com.ecyrd.jspwiki.auth.AuthorizationManager;
import com.ecyrd.jspwiki.auth.UserProfile;


/**
 * Tells if a page may be edited.  This tag takes care of all possibilities, user permissions, page
 * version, etc.
 *
 * @author Janne Jalkanen
 *
 * @since 2.0
 */
public class PermissionTag
        extends WikiTagBase
{
    /** DOCUMENT ME! */
    private String m_permission;

    /**
     * DOCUMENT ME!
     *
     * @param permission DOCUMENT ME!
     */
    public void setPermission(String permission)
    {
        m_permission = permission;
    }

    /**
     * DOCUMENT ME!
     *
     * @return DOCUMENT ME!
     *
     * @throws IOException DOCUMENT ME!
     */
    public final int doWikiStartTag()
            throws IOException
    {
        WikiEngine engine = m_wikiContext.getEngine();
        WikiPage page = m_wikiContext.getPage();
        AuthorizationManager mgr = engine.getAuthorizationManager();
        boolean gotPermission = false;
        UserProfile userprofile = m_wikiContext.getCurrentUser();

        if (page != null)
        {
            gotPermission = mgr.checkPermission(page, userprofile, m_permission);
        }

        return gotPermission
                ? EVAL_BODY_INCLUDE
                : SKIP_BODY;
    }
}

Move Permission Check into JSP