Passwords.java

/*
    Copyright (C) 2016 maik.jablonski@jease.org

    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 3 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.  If not, see <http://www.gnu.org/licenses/>.
 */
package jease.cms.service;

import java.util.function.Function;

import jease.Names;
import jease.Registry;
import jfix.util.Crypts;
import jfix.util.Reflections;

/**
 * Service to ease the handling of passwords (e.g. validation).
 */
public class Passwords {

	/**
	 * Default implementation for password validation. A valid password needs to
	 * contain at least 8 characters with mixed case letters, digits and
	 * symbols.
	 */
	public static class PasswordValidator implements Function<String, Boolean> {
		public Boolean apply(String password) {
			return Crypts.isStrongPassword(password);
		}
	}

	/**
	 * Returns true if given password is valid.
	 * 
	 * If JEASE_PASSWORD_VALIDATOR is found in the Registry, it will be used. It
	 * must be a class which implements
	 * <code>java.util.function.Function<String, Boolean></code>.
	 * 
	 * Otherwise a generic password validation is used: the password must
	 * contain 8 characters (mixed case letters, digits and symbols).
	 */
	public static boolean isValid(String password) {
		String passwordValidator = Registry
				.getParameter(Names.JEASE_PASSWORD_VALIDATOR);
		if (passwordValidator != null) {
			return ((Function<String, Boolean>) Reflections
					.newInstance(passwordValidator)).apply(password);
		} else {
			return new PasswordValidator().apply(password);
		}
	}

}