class_GraphicalCodeCaptchaVerifierFilter.php

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<?php
class GraphicalCodeCaptchaVerifierFilter extends BaseFilter implements Filterable {
        protected function __construct () {
                // Call parent constructor
                parent::__construct(__CLASS__);
        }

        public final static function createGraphicalCodeCaptchaVerifierFilter () {
                // Get a new instance
                $filterInstance = new GraphicalCodeCaptchaVerifierFilter();

                // Return the instance
                return $filterInstance;
        }

        public function execute (Requestable $requestInstance, Responseable $responseInstance) {
                // Get the captcha code
                $captchaCode = $requestInstance->getRequestElement('c_code');

                // Is this set?
                if (is_null($captchaCode)) {
                        // Not set so request is invalid
                        $requestInstance->requestIsValid(false);

                        // Add fatal message
                        $responseInstance->addFatalMessage('captcha_code_unset');

                        // Skip further processing
                        return false;
                } elseif (empty($captchaCode)) {
                        // Empty value so request is invalid
                        $requestInstance->requestIsValid(false);

                        // Add fatal message
                        $responseInstance->addFatalMessage('captcha_code_empty');

                        // Skip further processing
                        return false;
                }

                // Get the hash as well
                $captchaHash = $requestInstance->getRequestElement('hash');

                // Is this set?
                if (is_null($captchaHash)) {
                        // Not set so request is invalid
                        $requestInstance->requestIsValid(false);

                        // Add fatal message
                        $responseInstance->addFatalMessage('captcha_hash_unset');

                        // Skip further processing
                        return false;
                } elseif (empty($captchaHash)) {
                        // Empty value so request is invalid
                        $requestInstance->requestIsValid(false);

                        // Add fatal message
                        $responseInstance->addFatalMessage('captcha_hash_empty');

                        // Skip further processing
                        return false;
                }

                // Now, both are set hash the given one. First get a crypto instance
                $cryptoInstance = ObjectFactory::createObjectByConfiguredName('crypto_class');

                // Then hash the code
                $hashedCode = $cryptoInstance->hashString($captchaCode, $captchaHash);

                // Is this CAPTCHA valid?
                if ($hashedCode != $captchaHash) {
                        // Not the same so request is invalid
                        $requestInstance->requestIsValid(false);

                        // Add fatal message
                        $responseInstance->addFatalMessage('captcha_hash_mismatch');
                } // END - not the same!
        }
}

// [EOF]
?>