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<?php |
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/****************************************************************************** |
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* Wikipedia Account Creation Assistance tool * |
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* ACC Development Team. Please see team.json for a list of contributors. * |
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* * |
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* This is free and unencumbered software released into the public domain. * |
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* Please see LICENSE.md for the full licencing statement. * |
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******************************************************************************/ |
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namespace Waca\Security; |
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use Exception; |
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use Waca\WebRequest; |
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class TokenManager |
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{ |
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/** |
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* Validates a CSRF token |
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* |
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* @param string $data The token data string itself |
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* @param string|null $context Token context for extra validation |
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* |
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* @return bool |
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*/ |
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public function validateToken($data, $context = null) |
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{ |
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if (!is_string($data) || strlen($data) === 0) { |
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// Nothing to validate |
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return false; |
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} |
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$tokens = WebRequest::getSessionTokenData(); |
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// if the token doesn't exist, then it's not valid |
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if (!array_key_exists($data, $tokens)) { |
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return false; |
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} |
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/** @var Token $token */ |
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$token = unserialize($tokens[$data]); |
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if ($token->getTokenData() !== $data) { |
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return false; |
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} |
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if ($token->getContext() !== $context) { |
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return false; |
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} |
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if ($token->isUsed()) { |
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return false; |
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} |
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// mark the token as used, and save it back to the session |
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$token->markAsUsed(); |
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$this->storeToken($token); |
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return true; |
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} |
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/** |
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* @param string|null $context An optional context for extra validation |
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* |
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* @return Token |
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*/ |
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public function getNewToken($context = null) |
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{ |
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$token = new Token($this->generateTokenData(), $context); |
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$this->storeToken($token); |
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return $token; |
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} |
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/** |
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* Stores a token in the session data |
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* |
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* @param Token $token |
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*/ |
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private function storeToken(Token $token) |
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{ |
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$tokens = WebRequest::getSessionTokenData(); |
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$tokens[$token->getTokenData()] = serialize($token); |
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WebRequest::setSessionTokenData($tokens); |
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} |
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/** |
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* Generates a security token |
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* |
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* @return string |
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* @throws Exception |
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* |
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* @category Security-Critical |
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*/ |
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private function generateTokenData() |
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{ |
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$genBytes = openssl_random_pseudo_bytes(33); |
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if ($genBytes !== false) { |
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return base64_encode($genBytes); |
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} |
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throw new Exception('Unable to generate secure token.'); |
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} |
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} |
enwikipedia-acc /
waca
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