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/* Copyright 2004, 2005, 2006 Acegi Technology Pty Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.acegisecurity.providers.dao.salt;

import org.acegisecurity.AuthenticationServiceException;

import org.acegisecurity.providers.dao.SaltSource;

import org.acegisecurity.userdetails.UserDetails;

import org.springframework.beans.factory.InitializingBean;

import java.lang.reflect.Method;


/**
 * Obtains a salt from a specified property of the {@link User} object.
 * 
 * 
 * This allows you to subclass User and provide an additional bean
 * getter for a salt. You should use a synthetic value that does not change,
 * such as a database primary key.  Do not use username if it is
 * likely to change.
 * 
 *
 * @author Ben Alex
 * @version $Id: ReflectionSaltSource.java,v 1.8 2006/01/27 05:17:13 benalex Exp $
 */
public class ReflectionSaltSource implements SaltSource, InitializingBean {
    //~ Instance fields ========================================================

    private String userPropertyToUse;

    //~ Methods ================================================================

    public void afterPropertiesSet() throws Exception {
        if ((this.getUserPropertyToUse() == null)
            || "".equals(this.getUserPropertyToUse())) {
            throw new IllegalArgumentException(
                "A userPropertyToUse must be set");
        }
    }

    /**
     * Performs reflection on the passed User to obtain the salt.
     * 
     * 
     * The property identified by userPropertyToUse must be
     * available from the passed User object. If it is not
     * available, an {@link AuthenticationServiceException} will be thrown.
     * 
     *
     * @param user which contains the method identified by
     *        userPropertyToUse
     *
     * @return the result of invoking user.userPropertyToUse()
     *
     * @throws AuthenticationServiceException if reflection fails
     */
    public Object getSalt(UserDetails user) {
        try {
            Method reflectionMethod = user.getClass()
                                          .getMethod(this.userPropertyToUse,
                    new Class[] {});

            return reflectionMethod.invoke(user, new Object[] {});
        } catch (Exception exception) {
            throw new AuthenticationServiceException(exception.getMessage(),
                exception);
        }
    }

    public String getUserPropertyToUse() {
        return userPropertyToUse;
    }

    /**
     * The method name to call to obtain the salt. If your
     * UserDetails contains a UserDetails.getSalt()
     * method, you should set this property to getSalt.
     *
     * @param userPropertyToUse the name of the getter to call to obtain
     *        the salt from the UserDetails
     */
    public void setUserPropertyToUse(String userPropertyToUse) {
        this.userPropertyToUse = userPropertyToUse;
    }
}