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<?php
/**
* CUrlValidator class file.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @link http://www.yiiframework.com/
* @copyright Copyright &copy; 2008-2009 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/

/**
* CUrlValidator validates that the attribute value is a valid http or https URL.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @version $Id$
* @package system.validators
* @since 1.0
*/
class CUrlValidator extends CValidator
{
/**
* @var string the regular expression used to validates the attribute value.
*/
public $pattern='/^(http|https):\/\/(([A-Z0-9][A-Z0-9_-]*)(\.[A-Z0-9][A-Z0-9_-]*)+)/i';
/**
* @var boolean whether the attribute value can be null or empty. Defaults to true,
* meaning that if the attribute is empty, it is considered valid.
*/
public $allowEmpty=true;

/**
* Validates the attribute of the object.
* If there is any error, the error message is added to the object.
* @param CModel the object being validated
* @param string the attribute being validated
*/
protected function validateAttribute($object,$attribute)
{
$value=$object->$attribute;
if($this->allowEmpty && ($value===null || $value===''))
return;
if(!preg_match($this->pattern,$value))
{
$message=$this->message!==null?$this->message:Yii::t('yii','{attribute} is not a valid URL.');
$this->addError($object,$attribute,$message);
}
}
}
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