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103 lines
3.0 KiB
103 lines
3.0 KiB
12 years ago
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<?php
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/**
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* @link http://www.yiiframework.com/
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* @copyright Copyright (c) 2008 Yii Software LLC
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* @license http://www.yiiframework.com/license/
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*/
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namespace yii\widgets;
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use Yii;
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use yii\base\InvalidConfigException;
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use yii\base\Widget;
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use yii\helpers\Html;
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use yii\helpers\Json;
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use yii\web\CaptchaAction;
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/**
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* Captcha renders a CAPTCHA image element.
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*
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* Captcha is used together with [[CaptchaAction]] provide [CAPTCHA](http://en.wikipedia.org/wiki/Captcha)
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* - a way of preventing Website spamming.
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*
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* The image element rendered by Captcha will display a CAPTCHA image generated by
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* an action whose route is specified by [[captchaAction]]. This action must be an instance of [[CaptchaAction]].
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*
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* When the user clicks on the CAPTCHA image, it will cause the CAPTCHA image
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* to be refreshed with a new CAPTCHA.
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*
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* You may use [[\yii\validators\CaptchaValidator]] to validate the user input matches
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* the current CAPTCHA verification code.
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @since 2.0
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*/
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class Captcha extends Widget
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{
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/**
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* @var string the route of the action that generates the CAPTCHA images.
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* The action represented by this route must be an action of [[CaptchaAction]].
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*/
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public $captchaAction = 'site/captcha';
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/**
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* @var array HTML attributes to be applied to the rendered image element.
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*/
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public $options = array();
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/**
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* Renders the widget.
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*/
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public function run()
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{
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$this->checkRequirements();
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if (!isset($this->options['id'])) {
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$this->options['id'] = $this->getId();
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}
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$id = $this->options['id'];
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$options = Json::encode($this->getClientOptions());
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$this->view->registerAssetBundle('yii/captcha');
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$this->view->registerJs("jQuery('#$id').yiiCaptcha($options);");
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$url = Yii::$app->getUrlManager()->createUrl($this->captchaAction, array('v' => uniqid()));
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echo Html::img($url, $this->options);
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}
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/**
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* Returns the options for the captcha JS widget.
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* @return array the options
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*/
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protected function getClientOptions()
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{
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$options = array(
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'refreshUrl' => Html::url(array($this->captchaAction, CaptchaAction::REFRESH_GET_VAR => 1)),
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'hashKey' => "yiiCaptcha/{$this->captchaAction}",
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);
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return $options;
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}
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/**
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* Checks if there is graphic extension available to generate CAPTCHA images.
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* This method will check the existence of ImageMagick and GD extensions.
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* @return string the name of the graphic extension, either "imagick" or "gd".
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* @throws InvalidConfigException if neither ImageMagick nor GD is installed.
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*/
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public static function checkRequirements()
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{
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if (extension_loaded('imagick')) {
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$imagick = new \Imagick();
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$imagickFormats = $imagick->queryFormats('PNG');
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if (in_array('PNG', $imagickFormats)) {
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return 'imagick';
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}
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}
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if (extension_loaded('gd')) {
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$gdInfo = gd_info();
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if (!empty($gdInfo['FreeType Support'])) {
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return 'gd';
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}
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}
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throw new InvalidConfigException('GD with FreeType or ImageMagick PHP extensions are required.');
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}
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}
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