/libraries/joomla/access/access.php
PHP | 383 lines | 190 code | 58 blank | 135 comment | 27 complexity | daeccc90298424a425309b52d16e4d11 MD5 | raw file
- <?php
- /**
- * @version $Id: access.php 21147 2011-04-14 16:49:40Z dextercowley $
- * @package Joomla.Framework
- * @subpackage Access
- * @copyright Copyright (C) 2005 - 2011 Open Source Matters, Inc. All rights reserved.
- * @license GNU General Public License version 2 or later; see LICENSE.txt
- */
- defined('JPATH_BASE') or die;
- jimport('joomla.access.rules');
- /**
- * Class that handles all access authorization routines.
- *
- * @package Joomla.Framework
- * @subpackage User
- * @since 1.6
- */
- class JAccess
- {
- /**
- * @since 1.6
- */
- protected static $viewLevels = array();
- /**
- * @since 1.6
- */
- protected static $assetRules = array();
- /**
- * Method to check if a user is authorised to perform an action, optionally on an asset.
- *
- * @param integer $userId Id of the user for which to check authorisation.
- * @param string $action The name of the action to authorise.
- * @param mixed $asset Integer asset id or the name of the asset as a string. Defaults to the global asset node.
- *
- * @return boolean True if authorised.
- * @since 1.6
- */
- public static function check($userId, $action, $asset = null)
- {
- // Sanitize inputs.
- $userId = (int) $userId;
- $action = strtolower(preg_replace('#[\s\-]+#', '.', trim($action)));
- $asset = strtolower(preg_replace('#[\s\-]+#', '.', trim($asset)));
- // Default to the root asset node.
- if (empty($asset)) {
- $asset = 1;
- }
- // Get the rules for the asset recursively to root if not already retrieved.
- if (empty(self::$assetRules[$asset])) {
- self::$assetRules[$asset] = self::getAssetRules($asset, true);
- }
- // Get all groups against which the user is mapped.
- $identities = self::getGroupsByUser($userId);
- array_unshift($identities, $userId * -1);
- return self::$assetRules[$asset]->allow($action, $identities);
- }
- /**
- * Method to check if a group is authorised to perform an action, optionally on an asset.
- *
- * @param integer $groupId The path to the group for which to check authorisation.
- * @param string $action The name of the action to authorise.
- * @param mixed $asset Integer asset id or the name of the asset as a string. Defaults to the global asset node.
- *
- * @return boolean True if authorised.
- * @since 1.6
- */
- public static function checkGroup($groupId, $action, $asset = null)
- {
- // Sanitize inputs.
- $groupId = (int) $groupId;
- $action = strtolower(preg_replace('#[\s\-]+#', '.', trim($action)));
- $asset = strtolower(preg_replace('#[\s\-]+#', '.', trim($asset)));
- // Get group path for group
- $groupPath = self::getGroupPath($groupId);
- // Default to the root asset node.
- if (empty($asset)) {
- $asset = 1;
- }
- // Get the rules for the asset recursively to root if not already retrieved.
- if (empty(self::$assetRules[$asset])) {
- self::$assetRules[$asset] = self::getAssetRules($asset, true);
- }
- return self::$assetRules[$asset]->allow($action, $groupPath);
- }
- /**
- * Gets the parent groups that a leaf group belongs to in it's branch back to the root of the tree
- * (including the leaf group id).
- *
- * @param mixed $groupId An integer or array of integers representing the identities to check.
- *
- * @return mixed True if allowed, false for an explicit deny, null for an implicit deny.
- * @since 1.6
- */
- protected static function getGroupPath($groupId)
- {
- static $groups, $paths;
-
- // Preload all groups
- if (empty($groups)) {
- $db = JFactory::getDbo();
- $query = $db->getQuery(true)
- ->select('parent.id, parent.lft, parent.rgt')
- ->from('#__usergroups AS parent')
- ->order('parent.lft');
- $db->setQuery($query);
- $groups = $db->loadObjectList('id');
- }
- // Make sure groupId is valid
- if (!array_key_exists($groupId, $groups))
- {
- return array();
- }
-
- // Get parent groups and leaf group
- if (!isset($paths[$groupId])) {
- $paths[$groupId] = array();
- foreach($groups as $group) {
- if ($group->lft <= $groups[$groupId]->lft && $group->rgt >= $groups[$groupId]->rgt) {
- $paths[$groupId][] = $group->id;
- }
- }
- }
-
- return $paths[$groupId];
- }
- /**
- * Method to return the JRules object for an asset. The returned object can optionally hold
- * only the rules explicitly set for the asset or the summation of all inherited rules from
- * parent assets and explicit rules.
- *
- * @param mixed $asset Integer asset id or the name of the asset as a string.
- * @param boolean $recursive True to return the rules object with inherited rules.
- *
- * @return object JRules object for the asset.
- * @since 1.6
- */
- public static function getAssetRules($asset, $recursive = false)
- {
- // Get the database connection object.
- $db = JFactory::getDbo();
- // Build the database query to get the rules for the asset.
- $query = $db->getQuery(true);
- $query->select($recursive ? 'b.rules' : 'a.rules');
- $query->from('#__assets AS a');
- // If the asset identifier is numeric assume it is a primary key, else lookup by name.
- if (is_numeric($asset)) {
- $query->where('a.id = '.(int) $asset);
- }
- else {
- $query->where('a.name = '.$db->quote($asset));
- }
- // If we want the rules cascading up to the global asset node we need a self-join.
- if ($recursive) {
- $query->leftJoin('#__assets AS b ON b.lft <= a.lft AND b.rgt >= a.rgt');
- $query->order('b.lft');
- }
- // Execute the query and load the rules from the result.
- $db->setQuery($query);
- $result = $db->loadResultArray();
- // Get the root even if the asset is not found and in recursive mode
- if ($recursive && empty($result)) {
- $query = $db->getQuery(true);
- $query->select('rules');
- $query->from('#__assets');
- $query->where('parent_id=0');
- $db->setQuery($query);
- $result = $db->loadResultArray();
- }
- // Instantiate and return the JRules object for the asset rules.
- $rules = new JRules;
- $rules->mergeCollection($result);
- return $rules;
- }
- /**
- * Method to return a list of user groups mapped to a user. The returned list can optionally hold
- * only the groups explicitly mapped to the user or all groups both explicitly mapped and inherited
- * by the user.
- *
- * @param integer $userId Id of the user for which to get the list of groups.
- * @param boolean $recursive True to include inherited user groups.
- *
- * @return array List of user group ids to which the user is mapped.
- * @since 1.6
- */
- public static function getGroupsByUser($userId, $recursive = true)
- {
- static $results = array();
- // Creates a simple unique string for each parameter combination:
- $storeId = $userId.':'.(int) $recursive;
- if (!isset($results[$storeId]))
- {
- // Guest user
- if (empty($userId))
- {
- $result = array(JComponentHelper::getParams('com_users')->get('guest_usergroup', 1));
- }
- // Registered user
- else
- {
- $db = JFactory::getDbo();
-
- // Build the database query to get the rules for the asset.
- $query = $db->getQuery(true);
- $query->select($recursive ? 'b.id' : 'a.id');
- $query->from('#__user_usergroup_map AS map');
- $query->where('map.user_id = '.(int) $userId);
- $query->leftJoin('#__usergroups AS a ON a.id = map.group_id');
-
- // If we want the rules cascading up to the global asset node we need a self-join.
- if ($recursive) {
- $query->leftJoin('#__usergroups AS b ON b.lft <= a.lft AND b.rgt >= a.rgt');
- }
-
- // Execute the query and load the rules from the result.
- $db->setQuery($query);
- $result = $db->loadResultArray();
-
- // Clean up any NULL or duplicate values, just in case
- JArrayHelper::toInteger($result);
-
- if (empty($result)) {
- $result = array('1');
- }
- else {
- $result = array_unique($result);
- }
- }
- $results[$storeId] = $result;
- }
- return $results[$storeId];
- }
- /**
- * Method to return a list of user Ids contained in a Group
- *
- * @param int $groupId The group Id
- * @param boolean $recursive Recursively include all child groups (optional)
- *
- * @return array
- * @since 1.6
- * @todo This method should move somewhere else?
- */
- public static function getUsersByGroup($groupId, $recursive = false)
- {
- // Get a database object.
- $db = JFactory::getDbo();
- $test = $recursive ? '>=' : '=';
- // First find the users contained in the group
- $query = $db->getQuery(true);
- $query->select('DISTINCT(user_id)');
- $query->from('#__usergroups as ug1');
- $query->join('INNER','#__usergroups AS ug2 ON ug2.lft'.$test.'ug1.lft AND ug1.rgt'.$test.'ug2.rgt');
- $query->join('INNER','#__user_usergroup_map AS m ON ug2.id=m.group_id');
- $query->where('ug1.id='.$db->Quote($groupId));
- $db->setQuery($query);
- $result = $db->loadResultArray();
- // Clean up any NULL values, just in case
- JArrayHelper::toInteger($result);
- return $result;
- }
- /**
- * Method to return a list of view levels for which the user is authorised.
- *
- * @param integer $userId Id of the user for which to get the list of authorised view levels.
- *
- * @return array List of view levels for which the user is authorised.
- * @since 1.6
- */
- public static function getAuthorisedViewLevels($userId)
- {
- // Get all groups that the user is mapped to recursively.
- $groups = self::getGroupsByUser($userId);
- // Only load the view levels once.
- if (empty(self::$viewLevels)) {
- // Get a database object.
- $db = JFactory::getDBO();
- // Build the base query.
- $query = $db->getQuery(true);
- $query->select('id, rules');
- $query->from('`#__viewlevels`');
- // Set the query for execution.
- $db->setQuery((string) $query);
- // Build the view levels array.
- foreach ($db->loadAssocList() as $level) {
- self::$viewLevels[$level['id']] = (array) json_decode($level['rules']);
- }
- }
- // Initialise the authorised array.
- $authorised = array(1);
- // Find the authorized levels.
- foreach (self::$viewLevels as $level => $rule)
- {
- foreach ($rule as $id)
- {
- if (($id < 0) && (($id * -1) == $userId)) {
- $authorised[] = $level;
- break;
- }
- // Check to see if the group is mapped to the level.
- elseif (($id >= 0) && in_array($id, $groups)) {
- $authorised[] = $level;
- break;
- }
- }
- }
- return $authorised;
- }
- /**
- * Method to return a list of actions for which permissions can be set given a component and section.
- *
- * @param string $component The component from which to retrieve the actions.
- * @param string $section The name of the section within the component from which to retrieve the actions.
- *
- * @return array List of actions available for the given component and section.
- * @since 1.6
- */
- public static function getActions($component, $section = 'component')
- {
- $actions = array();
- if (is_file(JPATH_ADMINISTRATOR.'/components/'.$component.'/access.xml')) {
- $xml = simplexml_load_file(JPATH_ADMINISTRATOR.'/components/'.$component.'/access.xml');
- foreach ($xml->children() as $child)
- {
- if ($section == (string) $child['name']) {
- foreach ($child->children() as $action) {
- $actions[] = (object) array('name' => (string) $action['name'], 'title' => (string) $action['title'], 'description' => (string) $action['description']);
- }
- break;
- }
- }
- }
- return $actions;
- }
- }