// --- BEGIN COPYRIGHT BLOCK ---
// 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; version 2 of the License.
//
// 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, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
// (C) 2007 Red Hat, Inc.
// All rights reserved.
// --- END COPYRIGHT BLOCK ---
package com.netscape.cms.evaluators;

import com.netscape.certsrv.apps.CMS;
import com.netscape.certsrv.authentication.IAuthToken;
import com.netscape.certsrv.base.SessionContext;
import com.netscape.certsrv.evaluators.IAccessEvaluator;
import com.netscape.certsrv.logging.ILogger;
import com.netscape.cmsutil.util.Utils;

/**
 * A class represents a IP address acls evaluator.
 * <P>
 *
 * @version $Revision$, $Date$
 */
public class IPAddressAccessEvaluator implements IAccessEvaluator {
    private String mType = "ipaddress";
    private String mDescription = "IP Address evaluator";
    private ILogger mLogger = CMS.getLogger();

    /**
     * Class constructor.
     */
    public IPAddressAccessEvaluator() {
    }

    /**
     * initialization. nothing for now.
     */
    public void init() {
    }

    /**
     * gets the type name for this acl evaluator
     *
     * @return type for this acl evaluator: ipaddress
     */
    public String getType() {
        return mType;
    }

    /**
     * gets the description for this acl evaluator
     *
     * @return description for this acl evaluator
     */
    public String getDescription() {
        return mDescription;
    }

    public String[] getSupportedOperators() {
        String[] s = new String[2];

        s[0] = "=";
        s[1] = "!=";
        return s;
    }

    /**
     * Gets the IP address from session context
     *
     * @param authToken authentication token
     * @param type must be "ipaddress"
     * @param op must be "=" or "!="
     * @param value the ipaddress
     */
    public boolean evaluate(IAuthToken authToken, String type, String op, String value) {

        return evaluate(type, op, value);
    }

    /**
     * evaluates uid in SessionContext to see if it has membership in
     * group value
     *
     * @param type must be "group"
     * @param op must be "="
     * @param value the group name
     * @return true if SessionContext uid belongs to the group value,
     *         false otherwise
     */
    public boolean evaluate(String type, String op, String value) {

        SessionContext mSC = SessionContext.getContext();

        value = Utils.stripQuotes(value);
        String ipaddress = (String) mSC.get(SessionContext.IPADDRESS);

        if (type.equals(mType)) {
            if (ipaddress == null) {
                log(ILogger.LL_FAILURE, CMS.getLogMessage("EVALUATOR_IPADDRESS_NULL"));
                return false;
            }
            if (op.equals("=")) {
                return ipaddress.matches(value);
            } else {
                return !(ipaddress.matches(value));
            }

        }

        return false;
    }

    private void log(int level, String msg) {
        if (mLogger == null)
            return;
        mLogger.log(ILogger.EV_SYSTEM, null, ILogger.S_ACLS,
                level, "GroupAccessEvaluator: " + msg);
    }
}