<?php /** * TReCaptcha class file * * @author Bérczi Gábor <gabor.berczi@devworx.hu> * @link http://www.devworx.hu/ * @copyright Copyright © 2011 DevWorx * @license http://www.pradosoft.com/license/ * @package System.Web.UI.WebControls */ Prado::using('System.3rdParty.ReCaptcha.recaptchalib'); /** * TReCaptcha class. * * TReCaptcha displays a reCAPTCHA (a token displayed as an image) that can be used * to determine if the input is entered by a real user instead of some program. It can * also prevent multiple submits of the same form either by accident, or on purpose (ie. spamming). * * The reCAPTCHA to solve (a string consisting of two separate words) displayed is automatically * generated by the reCAPTCHA system at recaptcha.net. However, in order to use the services * of the site you will need to register and get a public and a private API key pair, and * supply those to the reCAPTCHA control through setting the {@link setPrivateKey PrivateKey} * and {@link setPublicKey PublicKey} properties. * * Currently the reCAPTCHA API supports only one reCAPTCHA field per page, so you MUST make sure that all * your input is protected and validated by a single reCAPTCHA control. Placing more than one reCAPTCHA * control on the page will lead to unpredictable results, and the user will most likely unable to solve * any of them successfully. * * Upon postback, user input can be validated by calling {@link validate()}. * The {@link TReCaptchaValidator} control can also be used to do validation, which provides * server-side validation. Calling (@link validate()) will invalidate the token supplied, so all consecutive * calls to the method - without solving a new captcha - will return false. Therefore if implementing a multi-stage * input process, you must make sure that you call validate() only once, either at the end of the input process, or * you store the result till the end of the processing. * * The following template shows a typical use of TReCaptcha control: * <code> * <com:TReCaptcha ID="Captcha" * PublicKey="..." * PrivateKey="..." * /> * <com:TReCaptchaValidator ControlToValidate="Captcha" * ErrorMessage="You are challenged!" /> * </code> * * @author Bérczi Gábor <gabor.berczi@devworx.hu> * @package System.Web.UI.WebControls * @since 3.2 */ class TReCaptcha extends TWebControl implements IValidatable { private $_isValid=true; const ChallengeFieldName = 'recaptcha_challenge_field'; const ResponseFieldName = 'recaptcha_response_field'; public function getTagName() { return 'span'; } /** * Returns true if this control validated successfully. * Defaults to true. * @return bool wether this control validated successfully. */ public function getIsValid() { return $this->_isValid; } /** * @param bool wether this control is valid. */ public function setIsValid($value) { $this->_isValid=TPropertyValue::ensureBoolean($value); } public function getValidationPropertyValue() { return $this->Request[$this->getChallengeFieldName()]; } public function getPublicKey() { return $this->getViewState('PublicKey'); } public function setPublicKey($value) { return $this->setViewState('PublicKey', TPropertyValue::ensureString($value)); } public function getPrivateKey() { return $this->getViewState('PrivateKey'); } public function setPrivateKey($value) { return $this->setViewState('PrivateKey', TPropertyValue::ensureString($value)); } public function getThemeName() { return $this->getViewState('ThemeName'); } public function setThemeName($value) { return $this->setViewState('ThemeName', TPropertyValue::ensureString($value)); } public function getCustomTranslations() { return TPropertyValue::ensureArray($this->getViewState('CustomTranslations')); } public function setCustomTranslations($value) { return $this->setViewState('CustomTranslations', TPropertyValue::ensureArray($value)); } public function getLanguage() { return $this->getViewState('Language'); } public function setLanguage($value) { return $this->setViewState('Language', TPropertyValue::ensureString($value)); } public function getCallbackScript() { return $this->getViewState('CallbackScript'); } public function setCallbackScript($value) { return $this->setViewState('CallbackScript', TPropertyValue::ensureString($value)); } protected function getChallengeFieldName() { return /*$this->ClientID.'_'.*/self::ChallengeFieldName; } public function getResponseFieldName() { return /*$this->ClientID.'_'.*/self::ResponseFieldName; } public function getClientSideOptions() { $options = array(); if ($theme = $this->getThemeName()) $options['theme'] = $theme; if ($lang = $this->getLanguage()) $options['lang'] = $lang; if ($trans = $this->getCustomTranslations()) $options['custom_translations'] = $trans; return $options; } public function validate() { if (! ( ($challenge = @$_POST[$this->getChallengeFieldName()]) and ($response = @$_POST[$this->getResponseFieldName()]) ) ) return false; $resp = recaptcha_check_answer( $this->getPrivateKey(), $_SERVER["REMOTE_ADDR"], $challenge, $response ); return ($resp->is_valid==1); } /** * Checks for API keys * @param mixed event parameter */ public function onPreRender($param) { parent::onPreRender($param); if("" == $this->getPublicKey()) throw new TConfigurationException('recaptcha_publickey_unknown'); if("" == $this->getPrivateKey()) throw new TConfigurationException('recaptcha_privatekey_unknown'); // need to register captcha fields so they will be sent back also in callbacks $page = $this->getPage(); $page->registerRequiresPostData($this->getChallengeFieldName()); $page->registerRequiresPostData($this->getResponseFieldName()); } protected function addAttributesToRender($writer) { parent::addAttributesToRender($writer); $writer->addAttribute('id',$this->getClientID()); } public function regenerateToken() { // if we're in a callback, then schedule re-rendering of the control // if not, don't do anything, because a new challenge will be rendered anyway if ($this->Page->IsCallback) $this->Page->CallbackClient->jQuery($this->getClientID().' #recaptcha_reload','click'); } public function renderContents($writer) { $readyscript = 'jQuery(document).trigger('.TJavaScript::quoteString('captchaready:'.$this->getClientID()).')'; $cs = $this->Page->ClientScript; $id = $this->getClientID(); $divid = $id.'_1_recaptchadiv'; $writer->write('<div id="'.htmlspecialchars($divid).'">'); if (!$this->Page->IsCallback) { $writer->write(TJavaScript::renderScriptBlock( 'var RecaptchaOptions = '.TJavaScript::jsonEncode($this->getClientSideOptions()).';' )); $html = recaptcha_get_html($this->getPublicKey()); /* reCAPTCHA currently does not support multiple validations per page $html = str_replace( array(self::ChallengeFieldName,self::ResponseFieldName), array($this->getChallengeFieldName(),$this->getResponseFieldName()), $html ); */ $writer->write($html); $cs->registerEndScript('ReCaptcha::EventScript', 'jQuery(document).ready(function() { '.$readyscript.'; } );'); } else { $options = $this->getClientSideOptions(); $options['callback'] = new TJavaScriptLiteral('function() { '.$readyscript.'; '.$this->getCallbackScript().'; }'); $cs->registerScriptFile('ReCaptcha::AjaxScript', 'http://www.google.com/recaptcha/api/js/recaptcha_ajax.js'); $cs->registerEndScript('ReCaptcha::CreateScript::'.$id, implode(' ', array( 'if (!jQuery('.TJavaScript::quoteString('#'.$this->getResponseFieldName()).'))', '{', 'Recaptcha.destroy();', 'Recaptcha.create(', TJavaScript::quoteString($this->getPublicKey()).', ', TJavaScript::quoteString($divid).', ', TJavaScript::encode($options), ');', '}', ))); } $writer->write('</div>'); } }