yiiapi/framework/validators/CCaptchaValidator.php

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<?php
/**
 * CCaptchaValidator 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/
 */

/**
 * CCaptchaValidator validates that the attribute value is the same as the verification code displayed in the CAPTCHA.
 *
 * CCaptchaValidator should be used together with {@link CCaptchaAction}.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @package system.validators
 * @since 1.0
 */
class CCaptchaValidator extends CValidator
{
	/**
	 * @var boolean whether the comparison is case sensitive. Defaults to false.
	 */
	public $caseSensitive=false;
	/**
	 * @var string ID of the action that renders the CAPTCHA image. Defaults to 'captcha',
	 * meaning the 'captcha' action declared in the current controller.
	 * This can also be a route consisting of controller ID and action ID.
	 */
	public $captchaAction='captcha';
	/**
	 * @var boolean whether the attribute value can be null or empty.
	 * Defaults to false, meaning the attribute is invalid if it is empty.
	 */
	public $allowEmpty=false;

	/**
	 * 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;
		$captcha=$this->getCaptchaAction();
		// reason of array checking is explained here: https://github.com/yiisoft/yii/issues/1955
		if(is_array($value) || !$captcha->validate($value,$this->caseSensitive))
		{
			$message=$this->message!==null?$this->message:Yii::t('yii','The verification code is incorrect.');
			$this->addError($object,$attribute,$message);
		}
	}

	/**
	 * Returns the CAPTCHA action object.
	 * @throws CException if {@link action} is invalid