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<?php
/**
*
* This file is part of Aura for PHP.
*
* @license http://opensource.org/licenses/bsd-license.php BSD
*
*/
namespace Aura\Session;
/**
*
* Cross-site request forgery token tools.
*
* @package Aura.Session
*
*/
class CsrfToken
{
/**
*
* A cryptographically-secure random value generator.
*
* @var RandvalInterface
*
*/
protected $randval;
/**
*
* Session segment for values in this class.
*
* @var Segment
*
*/
protected $segment;
/**
*
* Constructor.
*
* @param Segment $segment A segment for values in this class.
*
* @param RandvalInterface $randval A cryptographically-secure random
* value generator.
*
*/
public function __construct(Segment $segment, RandvalInterface $randval)
{
$this->segment = $segment;
$this->randval = $randval;
if (! $this->segment->get('value')) {
$this->regenerateValue();
}
}
/**
*
* Checks whether an incoming CSRF token value is valid.
*
* @param string $value The incoming token value.
*
* @return bool True if valid, false if not.
*
*/
public function isValid($value)
{
if (function_exists('hash_equals')) {
return hash_equals($value, $this->getValue());
}
return $value === $this->getValue();
}
/**
*
* Gets the value of the outgoing CSRF token.
*
* @return string
*
*/
public function getValue()
{
return $this->segment->get('value');
}
/**
*
* Regenerates the value of the outgoing CSRF token.
*
* @return null
*
*/
public function regenerateValue()
{
$hash = hash('sha512', $this->randval->generate());
$this->segment->set('value', $hash);
}
}
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