/lib/validator/sfPasswordStrengthValidator.class.php

<?php

/**

 * Check strength of password

 *

 * @see 	http://snippets.symfony-project.org/snippets/from/mysyfy/order_by/date

 * @since	r20

 */

class sfPasswordStrengthValidator extends sfValidator

{

    public function execute (&$value, &$error)

    {

        $weakness = $this->Password_Strength($value);



        if($weakness==1) {

            $error = $this->getParameter('strength_error');

            return false;

        }



        return $weakness;

    }



    public function initialize ($context, $parameters = null)

    {

        parent::initialize($context);

        $this->setParameter('strength_error', 'Mot de passe trop simple');

        $this->getParameterHolder()->add($parameters);



        return true;

    }



    /**

     * Thanks for: Alix Axel Weblog

     *

     * @see 	http://www.alixaxel.com/wordpress/wp-content/2007/06/Password_Strength.phps

     */

    function Password_Strength($password, $username = null)

    {

        if (!empty($username)) {

            $password = str_replace($username, '', $password);

        }



        $strength = 0;

        $password_length = strlen($password);



        if ($password_length < 5) {

            return $strength;

        }

        else {

            $strength = $password_length * 4;

        }



        for ($i = 2; $i <= 4; $i++)

        {

            $temp = str_split($password, $i);

            $strength -= (ceil($password_length / $i) - count(array_unique($temp)));

        }



        preg_match_all('/[0-9]/', $password, $numbers);

        if (!empty($numbers)) {

            $numbers = count($numbers[0]);

            if ($numbers >= 3) {

                $strength += 5;

            }

        }

        else {

            $numbers = 0;

        }



        preg_match_all('/[|!@#$%&*\/=?,;.:\-_+~^¨\\\]/', $password, $symbols);



        if (!empty($symbols)) {

            $symbols = count($symbols[0]);



            if ($symbols >= 2) {

                $strength += 5;

            }

        }

        else {

            $symbols = 0;

        }



        preg_match_all('/[a-z]/', $password, $lowercase_characters);

        preg_match_all('/[A-Z]/', $password, $uppercase_characters);



        if (!empty($lowercase_characters)) {

            $lowercase_characters = count($lowercase_characters[0]);

        }

        else {

            $lowercase_characters = 0;

        }



        if (!empty($uppercase_characters)) {

            $uppercase_characters = count($uppercase_characters[0]);

        }

        else {

            $uppercase_characters = 0;

        }



        if (($lowercase_characters > 0) && ($uppercase_characters > 0)) {

            $strength += 10;

        }



        $characters = $lowercase_characters + $uppercase_characters;



        if (($numbers > 0) && ($symbols > 0)) {

            $strength += 15;

        }



        if (($numbers > 0) && ($characters > 0)) {

            $strength += 15;

        }



        if (($symbols > 0) && ($characters > 0)) {

            $strength += 15;

        }



        if (($numbers == 0) && ($symbols == 0)) {

            $strength -= 10;

        }



        if (($symbols == 0) && ($characters == 0)) {

            $strength -= 10;

        }



        if ($strength < 0) {

            $strength = 0;

        }



        if ($strength > 100) {

            $strength = 100;

        }



        return $strength;

    }

}

?>