path: root/framework/Web/UI/WebControls/TReCaptcha2.php

<?php

/**
 * TReCaptcha2 class file
 *
 * @author Cristian Camilo Naranjo Valencia
 * @link http://icolectiva.co
 * @copyright Copyright &copy; 2005-2016 The PRADO Group
 * @license https://github.com/pradosoft/prado/blob/master/COPYRIGHT
 * @package System.Web.UI.WebControls
 */

Prado::using('System.Web.UI.ActiveControls.TCallbackEventParameter');
Prado::using('System.Web.UI.ActiveControls.TActivePanel');

/**
 * TReCaptcha2 class.
 *
 * TReCaptcha2 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 setSecretKey SecretKey} 
 * and {@link setSiteKey SiteKey} 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 TReCaptcha2Validator} 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:TReCaptcha2 ID="Captcha"
 *                 SiteKey="..."
 *                 SecretKey="..."
 * />
 * <com:TReCaptcha2Validator ControlToValidate="Captcha"
 *                          ErrorMessage="You are challenged!" />
 * </code>
 *
 * @author Cristian Camilo Naranjo Valencia
 * @package System.Web.UI.WebControls
 * @since 3.3.1
 */

class TReCaptcha2 extends TActivePanel implements ICallbackEventHandler, IValidatable
{
    const ChallengeFieldName = 'g-recaptcha-response';
    private $_widgetId=0;
    private $_isValid=true;

    public function __construct()
    {
        parent::__construct();
        $this->setAdapter(new TActiveControlAdapter($this));
    }
    public function getActiveControl()
    {
        return $this->getAdapter()->getBaseActiveControl();
    }
    public function getClientSide()
    {
        return $this->getAdapter()->getBaseActiveControl()->getClientSide();
    }
    public function getClientClassName()
    {
        return 'Prado.WebUI.TReCaptcha2';
    }
    public function getTagName()
    {
        return 'div';
    }
    /**
     * 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->getResponseFieldName()];
    }
    public function getResponseFieldName()
    {
        $captchas = $this->Page->findControlsByType('TReCaptcha2');
        $cont = 0;
        $responseFieldName = self::ChallengeFieldName;
        foreach ($captchas as $captcha)
        {
            if ($this->getClientID() == $captcha->ClientID)
            {
                $responseFieldName .= ($cont > 0) ? '-'.$cont : '';
            }
            $cont++;
        }
        return $responseFieldName;
    }
    /**
     * Returns your site key. 
     * @return string.
     */
    public function getSiteKey()
    {
        return $this->getViewState('SiteKey');
    }
    /**
     * @param string your site key.
     */
    public function setSiteKey($value)
    {
        $this->setViewState('SiteKey', TPropertyValue::ensureString($value));
    }
    /**
     * Returns your secret key. 
     * @return string.
     */
    public function getSecretKey()
    {
        return $this->getViewState('SecretKey');
    }
    /**
     * @param string your secret key.
     */
    public function setSecretKey($value)
    {
        $this->setViewState('SecretKey', TPropertyValue::ensureString($value));
    }
    /**
     * Returns your language.
     * @return string.
     */
    public function getLanguage()
    {
        return $this->getViewState('Language', 'en');
    }
    /**
     * @param string your language.
     */
    public function setLanguage($value)
    {
        $this->setViewState('Language', TPropertyValue::ensureString($value), 'en');
    }
    /**
     * Returns the color theme of the widget. 
     * @return string.
     */
    public function getTheme()
    {
        return $this->getViewState('Theme', 'light');
    }
    /**
     * The color theme of the widget.
     * Default: light
     * @param string the color theme of the widget.
     */
    public function setTheme($value)
    {
        $this->setViewState('Theme', TPropertyValue::ensureString($value), 'light');
    }
    /**
     * Returns the type of CAPTCHA to serve.
     * @return string.
     */
    public function getType()
    {
        return $this->getViewState('Type', 'image');
    }
    /**
     * The type of CAPTCHA to serve.
     * Default: image
     * @param string the type of CAPTCHA to serve.
     */
    public function setType($value)
    {
        $this->setViewState('Type', TPropertyValue::ensureString($value), 'image');
    }
    /**
     * Returns the size of the widget.
     * @return string.
     */
    public function getSize()
    {
        return $this->getViewState('Size', 'normal');
    }
    /**
     * The size of the widget.
     * Default: normal
     * @param string the size of the widget.
     */
    public function setSize($value)
    {
        $this->setViewState('Size', TPropertyValue::ensureString($value), 'normal');
    }
    /**
     * Returns the tabindex of the widget and challenge.
     * If other elements in your page use tabindex, it should be set to make user navigation easier.
     * @return string.
     */
    public function getTabIndex()
    {
        return $this->getViewState('TabIndex', 0);
    }
    /**
     * The tabindex of the widget and challenge.
     * If other elements in your page use tabindex, it should be set to make user navigation easier.
     * Default: 0
     * @param string the tabindex of the widget and challenge.
     */
    public function setTabIndex($value)
    {
        $this->setViewState('TabIndex', TPropertyValue::ensureInteger($value), 0);
    }
    /**
     * Resets the reCAPTCHA widget.
     * Optional widget ID, defaults to the first widget created if unspecified.
     */
    public function reset()
    {
        $this->Page->CallbackClient->callClientFunction('grecaptcha.reset',array(array($this->WidgetId)));
    }
    /**
     * Gets the response for the reCAPTCHA widget.
     */
    public function getResponse()
    {
        return $this->getViewState('Response', '');
    }
    public function setResponse($value)
    {
        $this->setViewState('Response', TPropertyValue::ensureString($value), '');
    }
    public function getWidgetId()
    {
        return $this->getViewState('WidgetId', 0);
    }
    public function setWidgetId($value)
    {
        $this->setViewState('WidgetId', TPropertyValue::ensureInteger($value), 0);
    }
    protected function getClientOptions()
    {
        $options['ID'] = $this->getClientID();
        $options['EventTarget'] = $this->getUniqueID();
        $options['FormID'] = $this->Page->getForm()->getClientID();
        $options['onCallback'] = $this->hasEventHandler('OnCallback');
        $options['onCallbackExpired'] = $this->hasEventHandler('OnCallbackExpired');
        $options['options']['sitekey'] = $this->getSiteKey();
        if ($theme = $this->getTheme()) $options['options']['theme'] = $theme;
        if ($type = $this->getType()) $options['options']['type'] = $type;
        if ($size = $this->getSize()) $options['options']['size'] = $size;
        if ($tabIndex = $this->getTabIndex()) $options['options']['tabindex'] = $tabIndex;

        return $options;
    }
    protected function registerClientScript()
    {
        $id         = $this->getClientID();
        $options    = TJavaScript::encode($this->getClientOptions());
        $className  = $this->getClientClassName();
        $cs         = $this->Page->ClientScript;
        $code       = "new $className($options);";

        $cs->registerPradoScript('ajax');
        $cs->registerEndScript("grecaptcha:$id", $code);
    }
    public function validate()
    {
        $value = $this->getValidationPropertyValue();
        if($value === null || empty($value))
            return false;

        return true;
    }
    /**
     * Checks for API keys
     * @param mixed event parameter
     */
    public function onPreRender($param)
    {
        parent::onPreRender($param);

        if("" == $this->getSiteKey())
            throw new TConfigurationException('recaptcha_publickey_unknown');
        if("" == $this->getSecretKey())
            throw new TConfigurationException('recaptcha_privatekey_unknown');

        // need to register captcha fields so they will be sent postback
        $this->Page->registerRequiresPostData($this->getResponseFieldName());
        $this->Page->ClientScript->registerHeadScriptFile('grecaptcha2', 'https://www.google.com/recaptcha/api.js?onload=TReCaptcha2_onloadCallback&render=explicit&hl=' . $this->getLanguage());
    }
    protected function addAttributesToRender($writer)
    {
        $writer->addAttribute('id',$this->getClientID());
        parent::addAttributesToRender($writer);
    }
    public function raiseCallbackEvent($param)
    {
        $params = $param->getCallbackParameter();
        if ($params instanceof stdClass)
        {
            $callback = property_exists($params, 'onCallback');
            $callbackExpired = property_exists($params, 'onCallbackExpired');

            if ($callback)
            {
                $this->WidgetId = $params->widgetId;
                $this->Response = $params->response;
                $this->Page->CallbackClient->jQuery($params->responseField, 'text',array($params->response));

                if ($params->onCallback)
                {
                    $this->onCallback($param);
                }
            }

            if ($callbackExpired)
            {
                $this->Response = '';
                $this->reset();

                if ($params->onCallbackExpired)
                {
                    $this->onCallbackExpired($param);
                }
            }
        }
    }

    public function onCallback($param)
    {
        $this->raiseEvent('OnCallback', $this, $param);
    }

    public function onCallbackExpired($param)
    {
        $this->raiseEvent('OnCallbackExpired', $this, $param);
    }

    public function render($writer)
    {
        $this->registerClientScript();
        parent::render($writer);
    }
}