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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 SegmentInterface |
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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 SegmentInterface $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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public function __construct(SegmentInterface $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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} |
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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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* @param string $key A string key name which session value is saved. Defaults `value` |
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* |
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* @return bool True if valid, false if not. |
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* |
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*/ |
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public function isValid($value, $key = 'value') |
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{ |
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$oldval = $this->segment->get($key); |
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// Regenerate value for key |
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$this->regenerateValue($key); |
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if (function_exists('hash_equals')) { |
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return hash_equals($value, $oldval); |
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} |
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return $value === $oldval; |
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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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* @param string $key A string key name which session value is saved. Defaults `value` |
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* |
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* @return string |
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* |
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*/ |
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public function getValue($key = 'value') |
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{ |
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if ($this->segment->get($key) == null ) { |
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$this->regenerateValue($key); |
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} |
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return $this->segment->get($key); |
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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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* @param string $key A string key name which session value is saved. Defaults `value` |
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* |
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* @return null |
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* |
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*/ |
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public function regenerateValue($key = 'value') |
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{ |
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$hash = hash('sha512', $this->randval->generate()); |
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$this->segment->set($key, $hash); |
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} |
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} |
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auraphp /
Aura.Session
