<?php
/**
 * CEmailValidator class file.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @link http://www.yiiframework.com/
 * @copyright Copyright &copy; 2008-2011 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

/**
 * CEmailValidator validates that the attribute value is a valid email address.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @version $Id$
 * @package system.validators
 * @since 1.0
 */
class CEmailValidator extends CValidator
{
	/**
	 * @var string the regular expression used to validate the attribute value.
	 * @see http://www.regular-expressions.info/email.html
	 */
	public $pattern='/^[a-zA-Z0-9!#$%&\'*+\\/=?^_`{|}~-]+(?:\.[a-zA-Z0-9!#$%&\'*+\\/=?^_`{|}~-]+)*@(?:[a-zA-Z0-9](?:[a-zA-Z0-9-]*[a-zA-Z0-9])?\.)+[a-zA-Z0-9](?:[a-zA-Z0-9-]*[a-zA-Z0-9])?$/';
	/**
	 * @var string the regular expression used to validate email addresses with the name part.
	 * This property is used only when {@link allowName} is true.
	 * @since 1.0.5
	 * @see allowName
	 */
	public $fullPattern='/^[^@]*<[a-zA-Z0-9!#$%&\'*+\\/=?^_`{|}~-]+(?:\.[a-zA-Z0-9!#$%&\'*+\\/=?^_`{|}~-]+)*@(?:[a-zA-Z0-9](?:[a-zA-Z0-9-]*[a-zA-Z0-9])?\.)+[a-zA-Z0-9](?:[a-zA-Z0-9-]*[a-zA-Z0-9])?>$/';
	/**
	 * @var boolean whether to allow name in the email address (e.g. "Qiang Xue <qiang.xue@gmail.com>"). Defaults to false.
	 * @since 1.0.5
	 * @see fullPattern
	 */
	public $allowName=false;
	/**
	 * @var boolean whether to check the MX record for the email address.
	 * Defaults to false. To enable it, you need to make sure the PHP function 'checkdnsrr'
	 * exists in your PHP installation.
	 */
	public $checkMX=false;
	/**
	 * @var boolean whether to check port 25 for the email address.
	 * Defaults to false.
	 * @since 1.0.4
	 */
	public $checkPort=false;
	/**
	 * @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 $object the object being validated
	 * @param string $attribute the attribute being validated
	 */
	protected function validateAttribute($object,$attribute)
	{
		$value=$object->$attribute;
		if($this->allowEmpty && $this->isEmpty($value))
			return;
		if(!$this->validateValue($value))
		{
			$message=$this->message!==null?$this->message:Yii::t('yii','{attribute} is not a valid email address.');
			$this->addError($object,$attribute,$message);
		}
	}

	/**
	 * Validates a static value to see if it is a valid email.
	 * Note that this method does not respect {@link allowEmpty} property.
	 * This method is provided so that you can call it directly without going through the model validation rule mechanism.
	 * @param mixed $value the value to be validated
	 * @return boolean whether the value is a valid email
	 * @since 1.1.1
	 */
	public function validateValue($value)
	{
		$valid=is_string($value) && (preg_match($this->pattern,$value) || $this->allowName && preg_match($this->fullPattern,$value));
		if($valid)
			$domain=rtrim(substr($value,strpos($value,'@')+1),'>');
		if($valid && $this->checkMX && function_exists('checkdnsrr'))
			$valid=checkdnsrr($domain,'MX');
		if($valid && $this->checkPort && function_exists('fsockopen'))
			$valid=fsockopen($domain,25)!==false;
		return $valid;
	}
}