_getLanguage(); $pubkey = $this->params->get('public_key', ''); $theme = $this->params->get('theme', 'clean'); if ($pubkey == null || $pubkey == '') { throw new Exception(JText::_('PLG_RECAPTCHA_ERROR_NO_PUBLIC_KEY')); } $server = self::RECAPTCHA_API_SERVER; if ($app->isSSLConnection()) { $server = self::RECAPTCHA_API_SECURE_SERVER; } JHtml::_('script', $server . '/js/recaptcha_ajax.js'); $document->addScriptDeclaration('window.addEvent(\'domready\', function() { Recaptcha.create("' . $pubkey . '", "dynamic_recaptcha_1", {theme: "' . $theme . '",' . $lang . 'tabindex: 0});});' ); return true; } /** * Gets the challenge HTML * * @param string $name The name of the field. * @param string $id The id of the field. * @param string $class The class of the field. * * @return string The HTML to be embedded in the form. * * @since 2.5 */ public function onDisplay($name, $id, $class) { return '

'; } /** * Calls an HTTP POST function to verify if the user's guess was correct * * @return True if the answer is correct, false otherwise * * @since 2.5 */ public function onCheckAnswer($code) { $input = JFactory::getApplication()->input; $privatekey = $this->params->get('private_key'); $remoteip = $input->server->get('REMOTE_ADDR', '', 'string'); $challenge = $input->get('recaptcha_challenge_field', '', 'string'); $response = $input->get('recaptcha_response_field', '', 'string'); // Check for Private Key if (empty($privatekey)) { $this->_subject->setError(JText::_('PLG_RECAPTCHA_ERROR_NO_PRIVATE_KEY')); return false; } // Check for IP if (empty($remoteip)) { $this->_subject->setError(JText::_('PLG_RECAPTCHA_ERROR_NO_IP')); return false; } // Discard spam submissions if ($challenge == null || strlen($challenge) == 0 || $response == null || strlen($response) == 0) { $this->_subject->setError(JText::_('PLG_RECAPTCHA_ERROR_EMPTY_SOLUTION')); return false; } $response = $this->_recaptcha_http_post( self::RECAPTCHA_VERIFY_SERVER, "/verify", array( 'privatekey' => $privatekey, 'remoteip' => $remoteip, 'challenge' => $challenge, 'response' => $response ) ); $answers = explode("\n", $response[1]); if (trim($answers[0]) == 'true') { return true; } else { // @todo use exceptions here $this->_subject->setError(JText::_('PLG_RECAPTCHA_ERROR_' . strtoupper(str_replace('-', '_', $answers[1])))); return false; } } /** * Encodes the given data into a query string format. * * @param string $data Array of string elements to be encoded * * @return string Encoded request * * @since 2.5 */ private function _recaptcha_qsencode($data) { $req = ""; foreach ($data as $key => $value) { $req .= $key . '=' . urlencode(stripslashes($value)) . '&'; } // Cut the last '&' $req = rtrim($req, '&'); return $req; } /** * Submits an HTTP POST to a reCAPTCHA server. * * @param string $host * @param string $path * @param array $data * @param int $port * * @return array Response * * @since 2.5 */ private function _recaptcha_http_post($host, $path, $data, $port = 80) { $req = $this->_recaptcha_qsencode($data); $http_request = "POST $path HTTP/1.0\r\n"; $http_request .= "Host: $host\r\n"; $http_request .= "Content-Type: application/x-www-form-urlencoded;\r\n"; $http_request .= "Content-Length: " . strlen($req) . "\r\n"; $http_request .= "User-Agent: reCAPTCHA/PHP\r\n"; $http_request .= "\r\n"; $http_request .= $req; $response = ''; if (($fs = @fsockopen($host, $port, $errno, $errstr, 10)) == false ) { die('Could not open socket'); } fwrite($fs, $http_request); while (!feof($fs)) { // One TCP-IP packet $response .= fgets($fs, 1160); } fclose($fs); $response = explode("\r\n\r\n", $response, 2); return $response; } /** * Get the language tag or a custom translation * * @return string * * @since 2.5 */ private function _getLanguage() { $language = JFactory::getLanguage(); $tag = explode('-', $language->getTag()); $tag = $tag[0]; $available = array('en', 'pt', 'fr', 'de', 'nl', 'ru', 'es', 'tr'); if (in_array($tag, $available)) { return "lang : '" . $tag . "',"; } // If the default language is not available, let's search for a custom translation if ($language->hasKey('PLG_RECAPTCHA_CUSTOM_LANG')) { $custom[] = 'custom_translations : {'; $custom[] = "\t" . 'instructions_visual : "' . JText::_('PLG_RECAPTCHA_INSTRUCTIONS_VISUAL') . '",'; $custom[] = "\t" . 'instructions_audio : "' . JText::_('PLG_RECAPTCHA_INSTRUCTIONS_AUDIO') . '",'; $custom[] = "\t" . 'play_again : "' . JText::_('PLG_RECAPTCHA_PLAY_AGAIN') . '",'; $custom[] = "\t" . 'cant_hear_this : "' . JText::_('PLG_RECAPTCHA_CANT_HEAR_THIS') . '",'; $custom[] = "\t" . 'visual_challenge : "' . JText::_('PLG_RECAPTCHA_VISUAL_CHALLENGE') . '",'; $custom[] = "\t" . 'audio_challenge : "' . JText::_('PLG_RECAPTCHA_AUDIO_CHALLENGE') . '",'; $custom[] = "\t" . 'refresh_btn : "' . JText::_('PLG_RECAPTCHA_REFRESH_BTN') . '",'; $custom[] = "\t" . 'help_btn : "' . JText::_('PLG_RECAPTCHA_HELP_BTN') . '",'; $custom[] = "\t" . 'incorrect_try_again : "' . JText::_('PLG_RECAPTCHA_INCORRECT_TRY_AGAIN') . '",'; $custom[] = '},'; $custom[] = "lang : '" . $tag . "',"; return implode("\n", $custom); } // If nothing helps fall back to english return ''; } }