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Name File: Logger.php

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<?php
/*
* 2007-2013 PrestaShop
*
* NOTICE OF LICENSE
*
* This source file is subject to the Open Software License (OSL 3.0)
* that is bundled with this package in the file LICENSE.txt.
* It is also available through the world-wide-web at this URL:
* http://opensource.org/licenses/osl-3.0.php
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to license@prestashop.com so we can send you a copy immediately.
*
* DISCLAIMER
*
* Do not edit or add to this file if you wish to upgrade PrestaShop to newer
* versions in the future. If you wish to customize PrestaShop for your
* needs please refer to http://www.prestashop.com for more information.
*
*  @author PrestaShop SA <contact@prestashop.com>
*  @copyright  2007-2013 PrestaShop SA
*  @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
*  International Registered Trademark & Property of PrestaShop SA
*/

class	LoggerCore extends ObjectModel
{
	/** @var integer Log id */
	public $id_log;

	/** @var integer Log severity */
	public $severity;

	/** @var integer Error code */
	public $error_code;

	/** @var string Message */
	public $message;

	/** @var string Object type (eg. Order, Customer...) */
	public $object_type;

	/** @var integer Object ID */
	public $object_id;

	/** @var string Object creation date */
	public $date_add;

	/** @var string Object last modification date */
	public $date_upd;

	/**
	 * @see ObjectModel::$definition
	 */
	public static $definition = array(
		'table' => 'log',
		'primary' => 'id_log',
		'fields' => array(
			'severity' => 		array('type' => self::TYPE_INT, 'validate' => 'isInt', 'required' => true),
			'error_code' => 	array('type' => self::TYPE_INT, 'validate' => 'isUnsignedInt'),
			'message' => 		array('type' => self::TYPE_STRING, 'validate' => 'isMessage', 'required' => true),
			'object_id' => 		array('type' => self::TYPE_INT, 'validate' => 'isUnsignedInt'),
			'object_type' =>	array('type' => self::TYPE_STRING, 'validate' => 'isName'),
			'date_add' => 		array('type' => self::TYPE_DATE, 'validate' => 'isDate'),
			'date_upd' => 		array('type' => self::TYPE_DATE, 'validate' => 'isDate'),
		),
	);

	protected static $is_present = array();

	/**
	 * Send e-mail to the shop owner only if the minimal severity level has been reached
	 *
	 * @param Logger
	 * @param unknown_type $log
	 */
	public static function sendByMail($log)
	{
		if (intval(Configuration::get('PS_LOGS_BY_EMAIL')) <= intval($log->severity))
			Mail::Send(
				(int)Configuration::get('PS_LANG_DEFAULT'),
				'log_alert',
				Mail::l('Log: You have a new alert from your shop', (int)Configuration::get('PS_LANG_DEFAULT')),
				array(),
				Configuration::get('PS_SHOP_EMAIL')
			);
	}

	/**
	 * add a log item to the database and send a mail if configured for this $severity
	 *
	 * @param string $message the log message
	 * @param int $severity
	 * @param int $error_code
	 * @param string $object_type
	 * @param int $object_id
	 * @param boolean $allow_duplicate if set to true, can log several time the same information (not recommended)
	 * @return boolean true if succeed
	 */
	public static function addLog($message, $severity = 1, $error_code = null, $object_type = null, $object_id = null, $allow_duplicate = false)
	{
		$log = new Logger();
		$log->severity = intval($severity);
		$log->error_code = intval($error_code);
		$log->message = pSQL($message);
		$log->date_add = date('Y-m-d H:i:s');
		$log->date_upd = date('Y-m-d H:i:s');
		if (!empty($object_type) && !empty($object_id))
		{
			$log->object_type = pSQL($object_type);
			$log->object_id = intval($object_id);
		}

		Logger::sendByMail($log);

		if ($allow_duplicate || !$log->_isPresent())
		{
			$res = $log->add();
			if ($res)
			{
				self::$is_present[$log->getHash()] = isset(self::$is_present[$log->getHash()])?self::$is_present[$log->getHash()] + 1:1;
				return true;
			}
		}
		return false;
	}

	/**
	 * this function md5($this->message.$this->severity.$this->error_code.$this->object_type.$this->object_id)
	 *
	 * @return string hash
	 */
	public function getHash()
	{
		if (empty($this->hash))
			$this->hash = md5($this->message.$this->severity.$this->error_code.$this->object_type.$this->object_id);

		return $this->hash;
	}

	/**
	 * check if this log message already exists in database.
	 *
	 * @return true if exists
	 */
	protected function _isPresent()
	{
		if (!isset(self::$is_present[md5($this->message)]))
			self::$is_present[$this->getHash()] = Db::getInstance()->getValue('SELECT COUNT(*)
				FROM `'._DB_PREFIX_.'log`
				WHERE
					`message` = \''.$this->message.'\'
					AND `severity` = \''.$this->severity.'\'
					AND `error_code` = \''.$this->error_code.'\'
					AND `object_type` = \''.$this->object_type.'\'
					AND `object_id` = \''.$this->object_id.'\'
				');

		return self::$is_present[$this->getHash()];
	}
}