Command Object for control of password change

PasswordChangeCommand.groovy

package com.wordpress.sergiosmind.command
import grails.validation.Validateable;
import groovy.transform.ToString;

@Validateable
@ToString
class PasswordChangeCommand {
        //dependency injection for SpringSecurityService
	def springSecurityService
	
	String username
	
	String actualPassword
	
	String newPassword
	
	String repNewPassword
	
	static constraints = {
		
		actualPassword(nullable: false, blank: false, validator: {String password, obj ->
			String enc = obj.springSecurityService.encodePassword(password)
			String encPasswordUser = obj.springSecurityService.currentUser.password
			//check if the actual password informed is not equals as the current user password
                        if( enc != encPasswordUser ) {
				return 'PasswordChangeCommand.actualPasswordMismatch' //key of the i18 message
			} else {
				return true
			}
		})
		
		newPassword(nullable: false, blank: false)
		repNewPassword(nullable: false, blank: false, validator: {String repNewPassword, obj ->
			String newPassword = obj.properties['newPassword']
			if( !(newPassword == repNewPassword) ) {
				return 'PasswordChangeCommand.newPasswordMismatch' //key of the i18 message
			} else {
				return true
			}
		})
	}
}