MapExpressionUserMapper.java

/* ====================================================================
 *
 * Copyright (C) 2015 GeoSolutions S.A.S.
 * http://www.geo-solutions.it
 *
 * GPLv3 + Classpath exception
 *
 * 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 2 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.
 *
 * ====================================================================
 *
 * This software consists of voluntary contributions made by developers
 * of GeoSolutions.  For more information on GeoSolutions, please see
 * <http://www.geo-solutions.it/>.
 *
 */
package it.geosolutions.geostore.core.security;

import java.util.Map;

import org.springframework.expression.AccessException;
import org.springframework.expression.EvaluationContext;
import org.springframework.expression.PropertyAccessor;
import org.springframework.expression.TypedValue;


/**
 * Maps user attributes for a JSON object.
 * 
 * @author Geo
 *
 */
public class MapExpressionUserMapper extends ExpressionUserMapper {

    
    public MapExpressionUserMapper(Map<String, String> attributeMappings) {
        super(attributeMappings);
        // property accessor for JSONObject attributes (read only)
        evaluationContext.addPropertyAccessor(new PropertyAccessor() {

            @Override
            public void write(EvaluationContext ctx, Object target, String name, Object value)
                    throws AccessException {

            }

            @Override
            public TypedValue read(EvaluationContext ctx, Object target, String name)
                    throws AccessException {
                if (target instanceof Map) {
                    Map map = (Map) target;
                    return new TypedValue(map.get(name));
                }
                return null;
            }

            @Override
            public Class[] getSpecificTargetClasses() {
                return new Class[] { Map.class };
            }

            @Override
            public boolean canWrite(EvaluationContext ctx, Object target, String name)
                    throws AccessException {
                return false;
            }

            @Override
            public boolean canRead(EvaluationContext ctx, Object target, String name)
                    throws AccessException {
                return target instanceof Map;
            }
        });
    }
    
}