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