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Filename : warnings.php
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<?php
/**
 * @package     Joomla.Administrator
 * @subpackage  com_installer
 *
 * @copyright   Copyright (C) 2005 - 2016 Open Source Matters, Inc. All rights reserved.
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */

defined('_JEXEC') or die;

/**
 * Extension Manager Templates Model
 *
 * @since  1.6
 */
class InstallerModelWarnings extends JModelList
{
	/**
	 * Extension Type
	 * @var	string
	 */
	public $type = 'warnings';

	/**
	 * Return the byte value of a particular string.
	 *
	 * @param   string  $val  String optionally with G, M or K suffix
	 *
	 * @return  integer   size in bytes
	 *
	 * @since 1.6
	 */
	public function return_bytes($val)
	{
		$val = trim($val);
		$last = strtolower($val{strlen($val) - 1});

		switch ($last)
		{
			// The 'G' modifier is available since PHP 5.1.0
			case 'g':
				$val *= 1024;
			case 'm':
				$val *= 1024;
			case 'k':
				$val *= 1024;
		}

		return $val;
	}

	/**
	 * Load the data.
	 *
	 * @return  array  Messages
	 *
	 * @since   1.6
	 */
	public function getItems()
	{
		static $messages;

		if ($messages)
		{
			return $messages;
		}

		$messages = array();
		$file_uploads = ini_get('file_uploads');

		if (!$file_uploads)
		{
			$messages[] = array('message' => JText::_('COM_INSTALLER_MSG_WARNINGS_FILEUPLOADSDISABLED'),
					'description' => JText::_('COM_INSTALLER_MSG_WARNINGS_FILEUPLOADISDISABLEDDESC'));
		}

		$upload_dir = ini_get('upload_tmp_dir');

		if (!$upload_dir)
		{
			$messages[] = array('message' => JText::_('COM_INSTALLER_MSG_WARNINGS_PHPUPLOADNOTSET'),
					'description' => JText::_('COM_INSTALLER_MSG_WARNINGS_PHPUPLOADNOTSETDESC'));
		}
		else
		{
			if (!is_writeable($upload_dir))
			{
				$messages[] = array('message' => JText::_('COM_INSTALLER_MSG_WARNINGS_PHPUPLOADNOTWRITEABLE'),
						'description' => JText::sprintf('COM_INSTALLER_MSG_WARNINGS_PHPUPLOADNOTWRITEABLEDESC', $upload_dir));
			}
		}

		$config = JFactory::getConfig();
		$tmp_path = $config->get('tmp_path');

		if (!$tmp_path)
		{
			$messages[] = array('message' => JText::_('COM_INSTALLER_MSG_WARNINGS_JOOMLATMPNOTSET'),
					'description' => JText::_('COM_INSTALLER_MSG_WARNINGS_JOOMLATMPNOTSETDESC'));
		}
		else
		{
			if (!is_writeable($tmp_path))
			{
				$messages[] = array('message' => JText::_('COM_INSTALLER_MSG_WARNINGS_JOOMLATMPNOTWRITEABLE'),
						'description' => JText::sprintf('COM_INSTALLER_MSG_WARNINGS_JOOMLATMPNOTWRITEABLEDESC', $tmp_path));
			}
		}

		$memory_limit = $this->return_bytes(ini_get('memory_limit'));

		if ($memory_limit < (8 * 1024 * 1024) && $memory_limit != -1)
		{
			// 8MB
			$messages[] = array('message' => JText::_('COM_INSTALLER_MSG_WARNINGS_LOWMEMORYWARN'),
					'description' => JText::_('COM_INSTALLER_MSG_WARNINGS_LOWMEMORYDESC'));
		}
		elseif ($memory_limit < (16 * 1024 * 1024) && $memory_limit != -1)
		{
			// 16MB
			$messages[] = array('message' => JText::_('COM_INSTALLER_MSG_WARNINGS_MEDMEMORYWARN'),
					'description' => JText::_('COM_INSTALLER_MSG_WARNINGS_MEDMEMORYDESC'));
		}

		$post_max_size = $this->return_bytes(ini_get('post_max_size'));
		$upload_max_filesize = $this->return_bytes(ini_get('upload_max_filesize'));

		if ($post_max_size < $upload_max_filesize)
		{
			$messages[] = array('message' => JText::_('COM_INSTALLER_MSG_WARNINGS_UPLOADBIGGERTHANPOST'),
					'description' => JText::_('COM_INSTALLER_MSG_WARNINGS_UPLOADBIGGERTHANPOSTDESC'));
		}

		if ($post_max_size < (8 * 1024 * 1024)) // 8MB
		{
			$messages[] = array('message' => JText::_('COM_INSTALLER_MSG_WARNINGS_SMALLPOSTSIZE'),
					'description' => JText::_('COM_INSTALLER_MSG_WARNINGS_SMALLPOSTSIZEDESC'));
		}

		if ($upload_max_filesize < (8 * 1024 * 1024)) // 8MB
		{
			$messages[] = array('message' => JText::_('COM_INSTALLER_MSG_WARNINGS_SMALLUPLOADSIZE'),
					'description' => JText::_('COM_INSTALLER_MSG_WARNINGS_SMALLUPLOADSIZEDESC'));
		}

		return $messages;
	}
}