<?php

namespace Sabre\DAV\Auth\Backend;

/**
 * Extremely simply HTTP Basic auth backend.
 *
 * This backend basically works by calling a callback, which receives a
 * username and password.
 * The callback must return true or false depending on if authentication was
 * correct.
 *
 * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
 * @author Evert Pot (http://evertpot.com/)
 * @license http://sabre.io/license/ Modified BSD License
 */
class BasicCallBack extends AbstractBasic
{
    /**
     * Callback.
     *
     * @var callable
     */
    protected $callBack;

    /**
     * Creates the backend.
     *
     * A callback must be provided to handle checking the username and
     * password.
     */
    public function __construct(callable $callBack)
    {
        $this->callBack = $callBack;
    }

    /**
     * Validates a username and password.
     *
     * This method should return true or false depending on if login
     * succeeded.
     *
     * @param string $username
     * @param string $password
     *
     * @return bool
     */
    protected function validateUserPass($username, $password)
    {
        $cb = $this->callBack;

        return $cb($username, $password);
    }
}
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