class_CaptchaEncryptFilter.php

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

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

                // Return the instance
                return $filterInstance;
        }

        public function execute (Requestable $requestInstance, Responseable $responseInstance) {
                // Get "encrypt" string barely from the request
                $encryptRequest = $requestInstance->getRequestElement('encrypt');

                // Is it there?
                if (is_null($encryptRequest)) {
                        // Not found, so request is invalid
                        $requestInstance->requestIsValid(false);

                        // Throw exception
                        throw new EncryptMissingException($this, CryptoHelper::EXCEPTION_ENCRYPT_MISSING);
                } // END - if

                // Decode it fully
                $encryptDecoded = base64_decode(str_replace(" ", "+", urldecode($encryptRequest)));

                // Get a crypto helper and decrypt the string
                $decryptedString = ObjectFactory::createObjectByConfiguredName('crypto_class')->decryptString($encryptDecoded);

                // Is it the expected length?
                if (strlen($decryptedString) != $this->getConfigInstance()->readConfig('captcha_string_length')) {
                        // Not found, so request is invalid
                        $requestInstance->requestIsValid(false);

                        // Throw exception
                        throw new EncryptInvalidLengthException($this, CryptoHelper::EXCEPTION_ENCRYPT_INVALID);
                } // END - if

                // Write it to the request
                $requestInstance->setRequestElement('decrypted', $decryptedString);
        }
}

// [EOF]
?>