.-.-.-.-.-

<?php
/**
 * @package     Joomla.Libraries
 * @subpackage  Plugin
 *
 * @copyright   Copyright (C) 2005 - 2017 Open Source Matters, Inc. All rights reserved.
 * @license     GNU General Public License version 2 or later; see LICENSE
 */

defined('JPATH_PLATFORM') or die;

/**
 * Plugin helper class
 *
 * @since  1.5
 */
abstract class JPluginHelper
{
	/**
	 * A persistent cache of the loaded plugins.
	 *
	 * @var    array
	 * @since  1.7
	 */
	protected static $plugins = null;

/**
	 * Get the path to a layout from a Plugin
	 *
	 * @param   string  $type    Plugin type
	 * @param   string  $name    Plugin name
	 * @param   string  $layout  Layout name
	 *
	 * @return  string  Layout path
	 *
	 * @since   3.0
	 */
	public static function getLayoutPath($type, $name, $layout = 'default')
	{
		$template = JFactory::getApplication()->getTemplate();
		$defaultLayout = $layout;

if (strpos($layout, ':') !== false)
		{
			// Get the template and file name from the string
			$temp = explode(':', $layout);
			$template = ($temp[0] == '_') ? $template : $temp[0];
			$layout = $temp[1];
			$defaultLayout = $temp[1] ?: 'default';
		}

// Build the template and base path for the layout
		$tPath = JPATH_THEMES . '/' . $template . '/html/plg_' . $type . '_' . $name . '/' . $layout . '.php';
		$bPath = JPATH_PLUGINS . '/' . $type . '/' . $name . '/tmpl/' . $defaultLayout . '.php';
		$dPath = JPATH_PLUGINS . '/' . $type . '/' . $name . '/tmpl/default.php';

// If the template has a layout override use it
		if (file_exists($tPath))
		{
			return $tPath;
		}
		elseif (file_exists($bPath))
		{
			return $bPath;
		}
		else
		{
			return $dPath;
		}
	}

/**
	 * Get the plugin data of a specific type if no specific plugin is specified
	 * otherwise only the specific plugin data is returned.
	 *
	 * @param   string  $type    The plugin type, relates to the subdirectory in the plugins directory.
	 * @param   string  $plugin  The plugin name.
	 *
	 * @return  mixed  An array of plugin data objects, or a plugin data object.
	 *
	 * @since   1.5
	 */
	public static function getPlugin($type, $plugin = null)
	{
		$result = array();
		$plugins = static::load();

// Find the correct plugin(s) to return.
		if (!$plugin)
		{
			foreach ($plugins as $p)
			{
				// Is this the right plugin?
				if ($p->type == $type)
				{
					$result[] = $p;
				}
			}
		}
		else
		{
			foreach ($plugins as $p)
			{
				// Is this plugin in the right group?
				if ($p->type == $type && $p->name == $plugin)
				{
					$result = $p;
					break;
				}
			}
		}

return $result;
	}

/**
	 * Checks if a plugin is enabled.
	 *
	 * @param   string  $type    The plugin type, relates to the subdirectory in the plugins directory.
	 * @param   string  $plugin  The plugin name.
	 *
	 * @return  boolean
	 *
	 * @since   1.5
	 */
	public static function isEnabled($type, $plugin = null)
	{
		$result = static::getPlugin($type, $plugin);

return !empty($result);
	}

/**
	 * Loads all the plugin files for a particular type if no specific plugin is specified
	 * otherwise only the specific plugin is loaded.
	 *
	 * @param   string            $type        The plugin type, relates to the subdirectory in the plugins directory.
	 * @param   string            $plugin      The plugin name.
	 * @param   boolean           $autocreate  Autocreate the plugin.
	 * @param   JEventDispatcher  $dispatcher  Optionally allows the plugin to use a different dispatcher.
	 *
	 * @return  boolean  True on success.
	 *
	 * @since   1.5
	 */
	public static function importPlugin($type, $plugin = null, $autocreate = true, JEventDispatcher $dispatcher = null)
	{
		static $loaded = array();

// Check for the default args, if so we can optimise cheaply
		$defaults = false;

if (is_null($plugin) && $autocreate == true && is_null($dispatcher))
		{
			$defaults = true;
		}

if (!isset($loaded[$type]) || !$defaults)
		{
			$results = null;

// Load the plugins from the database.
			$plugins = static::load();

// Get the specified plugin(s).
			for ($i = 0, $t = count($plugins); $i < $t; $i++)
			{
				if ($plugins[$i]->type == $type && ($plugin === null || $plugins[$i]->name == $plugin))
				{
					static::import($plugins[$i], $autocreate, $dispatcher);
					$results = true;
				}
			}

// Bail out early if we're not using default args
			if (!$defaults)
			{
				return $results;
			}

$loaded[$type] = $results;
		}

return $loaded[$type];
	}

/**
	 * Loads the plugin file.
	 *
	 * @param   object            $plugin      The plugin.
	 * @param   boolean           $autocreate  True to autocreate.
	 * @param   JEventDispatcher  $dispatcher  Optionally allows the plugin to use a different dispatcher.
	 *
	 * @return  void
	 *
	 * @since   1.5
	 * @deprecated  4.0  Use JPluginHelper::import() instead
	 */
	protected static function _import($plugin, $autocreate = true, JEventDispatcher $dispatcher = null)
	{
		static::import($plugin, $autocreate, $dispatcher);
	}

/**
	 * Loads the plugin file.
	 *
	 * @param   object            $plugin      The plugin.
	 * @param   boolean           $autocreate  True to autocreate.
	 * @param   JEventDispatcher  $dispatcher  Optionally allows the plugin to use a different dispatcher.
	 *
	 * @return  void
	 *
	 * @since   3.2
	 */
	protected static function import($plugin, $autocreate = true, JEventDispatcher $dispatcher = null)
	{
		static $paths = array();

$plugin->type = preg_replace('/[^A-Z0-9_\.-]/i', '', $plugin->type);
		$plugin->name = preg_replace('/[^A-Z0-9_\.-]/i', '', $plugin->name);

$path = JPATH_PLUGINS . '/' . $plugin->type . '/' . $plugin->name . '/' . $plugin->name . '.php';

if (!isset($paths[$path]))
		{
			if (file_exists($path))
			{
				if (!isset($paths[$path]))
				{
					require_once $path;
				}

$paths[$path] = true;

if ($autocreate)
				{
					// Makes sure we have an event dispatcher
					if (!is_object($dispatcher))
					{
						$dispatcher = JEventDispatcher::getInstance();
					}

$className = 'Plg' . $plugin->type . $plugin->name;

if (class_exists($className))
					{
						// Load the plugin from the database.
						if (!isset($plugin->params))
						{
							// Seems like this could just go bye bye completely
							$plugin = static::getPlugin($plugin->type, $plugin->name);
						}

// Instantiate and register the plugin.
						new $className($dispatcher, (array) $plugin);
					}
				}
			}
			else
			{
				$paths[$path] = false;
			}
		}
	}

/**
	 * Loads the published plugins.
	 *
	 * @return  array  An array of published plugins
	 *
	 * @since   1.5
	 * @deprecated  4.0  Use JPluginHelper::load() instead
	 */
	protected static function _load()
	{
		return static::load();
	}

/**
	 * Loads the published plugins.
	 *
	 * @return  array  An array of published plugins
	 *
	 * @since   3.2
	 */
	protected static function load()
	{
		if (static::$plugins !== null)
		{
			return static::$plugins;
		}

$levels = implode(',', JFactory::getUser()->getAuthorisedViewLevels());

/** @var JCacheControllerCallback $cache */
		$cache = JFactory::getCache('com_plugins', 'callback');

$loader = function () use ($levels)
		{
			$db = JFactory::getDbo();
			$query = $db->getQuery(true)
				->select(array($db->quoteName('folder', 'type'), $db->quoteName('element', 'name'), $db->quoteName('params')))
				->from('#__extensions')
				->where('enabled = 1')
				->where('type = ' . $db->quote('plugin'))
				->where('state IN (0,1)')
				->where('access IN (' . $levels . ')')
				->order('ordering');
			$db->setQuery($query);

return $db->loadObjectList();
		};

try
		{
			static::$plugins = $cache->get($loader, array(), md5($levels), false);
		}
		catch (JCacheException $cacheException)
		{
			static::$plugins = $loader();
		}

return static::$plugins;
	}
}

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