<?php

/*
 * This file is part of the Indigo Guardian package.
 *
 * (c) Indigo Development Team
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Indigo\Guardian\Authenticator;

use BeatSwitch\Lock\Callers\Caller;
use Assert\Assertion;

/**
 * Authenticate using a username-password pair
 *
 * @author Márk Sági-Kazár <mark.sagikazar@gmail.com>
 */
class UserPassword extends HasherAware
{
    /**
     * {@inheritdoc}
     */
    public function authenticate(array $subject, Caller $caller)
    {
        Assertion::choicesNotEmpty($subject, ['password']);
        Assertion::isInstanceOf(
            $caller,
            'Indigo\Guardian\Caller\User',
            sprintf('The caller was expected to be an instance of "%s"', 'Indigo\Guardian\Caller\User')
        );

        return $this->hasher->verify($subject['password'], $caller->getPassword());
    }
}

<?php

/*
 * This file is part of the Indigo Guardian package.
 *
 * (c) Indigo Development Team
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Indigo\Guardian\Authenticator;

use BeatSwitch\Lock\Callers\Caller;
use Indigo\Guardian\Caller\User;
use Assert\Assertion;

/**
 * Authenticate using a username-password pair
 *
 * @author Márk Sági-Kazár <mark.sagikazar@gmail.com>
 */
class UserPassword extends HasherAware
{
    /**
     * {@inheritdoc}
     */
    public function authenticate(array $subject, Caller $caller)
    {
        Assertion::choicesNotEmpty($subject, ['password']);
        Assertion::isInstanceOf(
            $caller,
            User::CLASS,
            sprintf('The caller was expected to be an instance of "%s"', User::CLASS)
        );

        return $this->hasher->verify($subject['password'], $caller->getPassword());
    }
}

--- 
+++ 
@@ -12,7 +12,6 @@
 namespace Indigo\Guardian\Authenticator;
 
 use BeatSwitch\Lock\Callers\Caller;
-use Indigo\Guardian\Caller\User;
 use Assert\Assertion;
 
 /**
@@ -30,8 +29,8 @@
         Assertion::choicesNotEmpty($subject, ['password']);
         Assertion::isInstanceOf(
             $caller,
-            User::CLASS,
-            sprintf('The caller was expected to be an instance of "%s"', User::CLASS)
+            'Indigo\Guardian\Caller\User',
+            sprintf('The caller was expected to be an instance of "%s"', 'Indigo\Guardian\Caller\User')
         );
 
         return $this->hasher->verify($subject['password'], $caller->getPassword());
Revert to string based class name because of PHP 5.4 support
