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<?php |
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namespace Jidaikobo\Kontiki\Managers; |
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use Aura\Session\Session; |
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class CsrfManager |
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{ |
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private const SEGMENT_NAME = 'jidaikobo\kontiki\csrf'; |
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private const MAX_HISTORY = 10; |
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private const EXPIRATION_TIME = 300; // sec. |
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private Session $session; |
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private $segment; |
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public function __construct(Session $session) |
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{ |
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$this->session = $session; |
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$this->segment = $this->session->getSegment(self::SEGMENT_NAME); |
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} |
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/** |
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* Obtaining a CSRF token |
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* |
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* @return string |
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*/ |
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public function getToken(): string |
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{ |
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return $this->session->getCsrfToken()->getValue(); |
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} |
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/** |
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* Validating CSRF tokens |
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* |
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* @param string|null $token |
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* @return bool |
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*/ |
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public function isValid(?string $token): bool |
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{ |
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$currentToken = $this->getToken(); |
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$history = $this->getTokenHistory(); |
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// Allows current token or tokens in history |
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return (!empty($currentToken) && hash_equals($currentToken, $token)) || |
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in_array($token, array_column($history, 'token'), true); |
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} |
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/** |
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* Regenerating the CSRF token |
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* |
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* @return void |
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*/ |
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public function regenerate(): void |
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{ |
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$csrfToken = $this->session->getCsrfToken(); |
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// Add the current token to the history |
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$history = $this->getTokenHistory(); |
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$history[] = [ |
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'token' => $csrfToken->getValue(), |
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'timestamp' => time(), |
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]; |
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// Trim history (remove old stuff) |
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$history = array_filter($history, function ($entry) { |
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return time() - $entry['timestamp'] <= self::EXPIRATION_TIME; |
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}); |
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if (count($history) > self::MAX_HISTORY) { |
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$history = array_slice($history, -self::MAX_HISTORY); |
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} |
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// Save history in session |
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$this->segment->set('csrf_token_history', $history); |
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// Regenerating the CSRF token |
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$csrfToken->regenerateValue(); |
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} |
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/** |
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* Get Token History |
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* |
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* @return array |
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*/ |
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private function getTokenHistory(): array |
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{ |
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return $this->segment->get('csrf_token_history') ?? []; |
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} |
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} |
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jidaikobo-shibata /
kontiki-framework
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