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<?php /** * CCaptcha class file. * * @author Qiang Xue <qiang.xue@gmail.com> * @link http://www.yiiframework.com/ * @copyright 2008-2013 Yii Software LLC * @license http://www.yiiframework.com/license/ */ /** * CCaptcha renders a CAPTCHA image element. * * CCaptcha is used together with {@link CCaptchaAction} to provide {@link http://en.wikipedia.org/wiki/Captcha CAPTCHA} * - a way of preventing site spam. * * The image element rendered by CCaptcha will display a CAPTCHA image generated * by an action of class {@link CCaptchaAction} belonging to the current controller. * By default, the action ID should be 'captcha', which can be changed by setting {@link captchaAction}. * * CCaptcha may also render a button next to the CAPTCHA image. Clicking on the button * will change the CAPTCHA image to be a new one in an AJAX way. * * If {@link clickableImage} is set true, clicking on the CAPTCHA image * will refresh the CAPTCHA. * * A {@link CCaptchaValidator} may be used to validate that the user enters * a verification code matching the code displayed in the CAPTCHA image. * * When combining CCaptcha with CActiveForm or CForm, make sure ajaxValidation is disabled. Performing ajax validation causes * your Captcha to be refreshed, rendering the code invalid on the next validation attempt. * * @author Qiang Xue <qiang.xue@gmail.com> * @package system.web.widgets.captcha * @since 1.0 */ class CCaptcha extends CWidget { /** * @var string the ID of the action that should provide CAPTCHA image. Defaults to 'captcha', * meaning the 'captcha' action of the current controller. This property may also * be in the format of 'ControllerID/ActionID'. Underneath, this property is used * by {@link CController::createUrl} to create the URL that would serve the CAPTCHA image. * The action has to be of {@link CCaptchaAction}. */ public $captchaAction='captcha'; /** * @var boolean whether to display a button next to the CAPTCHA image. Clicking on the button * will cause the CAPTCHA image to be changed to a new one. Defaults to true. */ public $showRefreshButton=true; /** * @var boolean whether to allow clicking on the CAPTCHA image to refresh the CAPTCHA letters. * Defaults to false. Hint: you may want to set {@link showRefreshButton} to false if you set * this property to be true because they serve for the same purpose. * To enhance accessibility, you may set {@link imageOptions} to provide hints to end-users that * the image is clickable. */ public $clickableImage=false; /** * @var string the label for the refresh button. Defaults to 'Get a new code'. */ public $buttonLabel; /** * @var string the type of the refresh button. This should be either 'link' or 'button'. * The former refers to hyperlink button while the latter a normal push button. * Defaults to 'link'. */ public $buttonType='link'; /** * @var array HTML attributes to be applied to the rendered image element. */ public $imageOptions=array(); /** * @var array HTML attributes to be applied to the rendered refresh button element. */ public $buttonOptions=array(); /** * Renders the widget. */ public function run() { if(self::checkRequirements('imagick') || self::checkRequirements('gd')) { $this->renderImage(); $this->registerClientScript(); } else throw new CException(Yii::t('yii','GD with FreeType or ImageMagick PHP extensions are required.')); } /** * Renders the CAPTCHA image. */ protected function renderImage() { if(!isset($this->imageOptions['id'])) $this->imageOptions['id']=$this->getId(); $url=$this->getController()->createUrl($this->captchaAction,array('v'=>uniqid())); $alt=isset($this->imageOptions['alt'])?$this->imageOptions['alt']:''; echo CHtml::image($url,$alt,$this->imageOptions); } /** * Registers the needed client scripts. */ public function registerClientScript() { $cs=Yii::app()->clientScript; $id=$this->imageOptions['id']; $url=$this->getController()->createUrl($this->captchaAction,array(CCaptchaAction::REFRESH_GET_VAR=>true)); $js=""; if($this->showRefreshButton) { // reserve a place in the registered script so that any enclosing button js code appears after the captcha js $cs->registerScript('Yii.CCaptcha#'.$id,'// dummy'); $label=$this->buttonLabel===null?Yii::t('yii','Get a new code'):$this->buttonLabel; $options=$this->buttonOptions; if(isset($options['id'])) $buttonID=$options['id']; else $buttonID=$options['id']=$id.'_button'; if($this->buttonType==='button') $html=CHtml::button($label, $options); else $html=CHtml::link($label, $url, $options); $js="jQuery('#$id').after(".CJSON::encode($html).");"; $selector="#$buttonID"; } if($this->clickableImage) $selector=isset($selector) ? "$selector, #$id" : "#$id"; if(!isset($selector)) return; $js.=" jQuery(document).on('click', '$selector', function(){ jQuery.ajax({ url: ".CJSON::encode($url).", dataType: 'json', cache: false, success: function(data) { jQuery('#$id').attr('src', data['url']); jQuery('body').data('{$this->captchaAction}.hash', [data['hash1'], data['hash2']]); } }); return false; }); "; $cs->registerScript('Yii.CCaptcha#'.$id,$js); } /** * Checks if specified graphic extension support is loaded. * @param string $extension name to be checked. Possible values are 'gd', 'imagick' and null. * Default value is null meaning that both extensions will be checked. This parameter * is available since 1.1.13. * @return boolean true if ImageMagick extension with PNG support or GD with FreeType support is loaded, * otherwise false * @since 1.1.5 */ public static function checkRequirements($extension=null) { if(extension_loaded('imagick')) { $imagick=new Imagick(); $imagickFormats=$imagick->queryFormats('PNG'); } if(extension_loaded('gd')) { $gdInfo=gd_info(); } if($extension===null) { if(isset($imagickFormats) && in_array('PNG',$imagickFormats)) return true; if(isset($gdInfo) && $gdInfo['FreeType Support']) return true; } elseif($extension=='imagick' && isset($imagickFormats) && in_array('PNG',$imagickFormats)) return true; elseif($extension=='gd' && isset($gdInfo) && $gdInfo['FreeType Support']) return true; return false; } }