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<?php
/**
* Elgg access permissions
* For users, objects, collections and all metadata
*
* @package Elgg
* @subpackage Core
* @license http://www.gnu.org/licenses/old-licenses/gpl-2.0.html GNU Public License version 2
* @author Curverider Ltd
* @copyright Curverider Ltd 2008
* @link http://elgg.org/
*/
/**
* Get the list of access restrictions the given user is allowed to see on this site
*
* @uses get_access_array
* @param int $user_id User ID; defaults to currently logged in user
* @param int $site_id Site ID; defaults to current site
* @param boolean $flush If set to true, will refresh the access list from the database
* @return string A list of access collections suitable for injection in an SQL call
*/
function get_access_list($user_id = 0, $site_id = 0, $flush = false) {
global $CONFIG;
static $access_list;
if (!isset($access_list))
$access_list = array();
if ($user_id == 0) $user_id = $_SESSION['id'];
if (($site_id == 0) && (isset($CONFIG->site_id))) $site_id = $CONFIG->site_id;
$user_id = (int) $user_id;
$site_id = (int) $site_id;
if (empty($access_list[$user_id]) || $flush == true) {
$access_list[$user_id] = "(" . implode(",",get_access_array($user_id, $site_id, $flush)) . ")";
}
return $access_list[$user_id];
}
/**
* Gets an array of access restrictions the given user is allowed to see on this site
*
* @param int $user_id User ID; defaults to currently logged in user
* @param int $site_id Site ID; defaults to current site
* @param boolean $flush If set to true, will refresh the access list from the database
* @return array An array of access collections suitable for injection in an SQL call
*/
function get_access_array($user_id = 0, $site_id = 0, $flush = false) {
global $CONFIG;
static $access_array;
if (!isset($access_array))
$access_array = array();
if ($user_id == 0) $user_id = $_SESSION['guid'];
if (($site_id == 0) && (isset($CONFIG->site_id))) $site_id = $CONFIG->site_id;
$user_id = (int) $user_id;
$site_id = (int) $site_id;
if (!$user = get_entity($user_id))
$user = null;
if (empty($access_array[$user_id]) || $flush == true) {
$query = "select am.access_collection_id from {$CONFIG->dbprefix}access_collection_membership am ";
$query .= " left join {$CONFIG->dbprefix}access_collections ag on ag.id = am.access_collection_id ";
$query .= " where am.user_guid = {$user_id} and (ag.site_guid = {$site_id} or ag.site_guid = 0)";
$tmp_access_array = array(2);
if (isloggedin())
$tmp_access_array[] = 1;
if ($collections = get_data($query)) {
foreach($collections as $collection)
$tmp_access_array[] = $collection->access_collection_id;
}
$access_array[$user_id] = $tmp_access_array;
}
$access_array_temp = trigger_plugin_hook('access:collections','user',array('user' => $user, 'site_id' => $site_id),$access_array[$user_id]);
return $access_array_temp;
}
/**
* Add access restriction sql code to a given query.
*
* Note that if this code is executed in privileged mode it will return blank.
*
* TODO: DELETE once Query classes are fully integrated
*
* @param string $table_prefix Optional xxx. prefix for the access code.
*/
function get_access_sql_suffix($table_prefix = "")
{
$sql = "";
if ($table_prefix)
$table_prefix = sanitise_string($table_prefix) . ".";
//if (!is_privileged())
//{
$access = get_access_list();
$sql = " ({$table_prefix}access_id in {$access} or ({$table_prefix}access_id = 0 and {$table_prefix}owner_guid = {$_SESSION['id']}))";
//}
//else
// $sql = " 1 ";
// Only return 'active' objects
$sql .= " and {$table_prefix}enabled='yes'";
return $sql;
}
/**
* Returns an array of access permissions that the specified user is allowed to save objects with.
* Permissions are of the form ('id' => 'Description')
*
* @param int $user_id The user's GUID.
* @param int $site_id The current site.
* @param true|false $flush If this is set to true, this will shun any cached version
* @return array List of access permissions=
*/
function get_write_access_array($user_id = 0, $site_id = 0, $flush = false) {
global $CONFIG;
static $access_array;
if ($user_id == 0) $user_id = $_SESSION['guid'];
if (($site_id == 0) && (isset($CONFIG->site_id))) $site_id = $CONFIG->site_id;
$user_id = (int) $user_id;
$site_id = (int) $site_id;
if (!$user = get_entity($user_id))
$user = null;
if (empty($access_array[$user_id]) || $flush == true) {
$query = "select ag.* from {$CONFIG->dbprefix}access_collections ag ";
$query .= " where (ag.site_guid = {$site_id} or ag.site_guid = 0)";
$query .= " and (ag.owner_guid = {$user_id} or ag.owner_guid = 0)";
$tmp_access_array = array();
if ($collections = get_data($query)) {
foreach($collections as $collection)
$tmp_access_array[$collection->id] = elgg_echo($collection->name);
}
$access_array[$user_id] = $tmp_access_array;
}
$tmp_access_array = trigger_plugin_hook('access:collections:write','user',array('user' => $user, 'site_id' => $site_id),$tmp_access_array);
return $tmp_access_array;
}
/**
* Creates a new access control collection owned by the specified user.
*
* @param string $name The name of the collection.
* @param int $owner_guid The GUID of the owner (default: currently logged in user).
* @param int $site_guid The GUID of the site (default: current site).
* @return int|false Depending on success (the collection ID if successful).
*/
function create_access_collection($name, $owner_guid = 0, $site_guid = 0) {
$name = trim($name);
if (empty($name)) return false;
if ($user_id == 0) $user_id = $_SESSION['id'];
if (($site_id == 0) && (isset($CONFIG->site_id))) $site_id = $CONFIG->site_id;
$name = sanitise_string($name);
global $CONFIG;
return insert_data("insert into {$CONFIG->dbprefix}access_collections set name = '{$name}', owner_guid = {$owner_guid}, site_guid = {$site_guid}");
}
/**
* Deletes a specified access collection
*
* @param int $collection_id The collection ID
* @return true|false Depending on success
*/
function delete_access_collection($collection_id) {
$collection_id = (int) $collection_id;
$collections = get_write_access_array();
if (in_array($collection_id,$collections)) {
global $CONFIG;
delete_data("delete from {$CONFIG->dbprefix}access_collection_membership where access_collection_id = {$collection_id}");
delete_data("delete from {$CONFIG->dbprefix}access_collections where id = {$collection_id}");
return true;
} else {
return false;
}
}
/**
* Adds a user to the specified user collection
*
* @param int $user_guid The GUID of the user to add
* @param int $collection_id The ID of the collection to add them to
* @return true|false Depending on success
*/
function add_user_to_access_collection($user_guid, $collection_id) {
$collection_id = (int) $collection_id;
$user_guid = (int) $user_guid;
$collections = get_write_access_array();
if (in_array($collection_id, $collections) && $user = get_user($user_guid)) {
global $CONFIG;
insert_data("insert into {$CONFIG->dbprefix}access_collection_membership set access_collection_id = {$collection_id}, user_guid = {$user_guid}");
return true;
}
return false;
}
/**
* Removes a user from an access collection
*
* @param int $user_guid The user GUID
* @param int $collection_id The access collection ID
* @return true|false Depending on success
*/
function remove_user_from_access_collection($user_guid, $collection_id) {
$collection_id = (int) $collection_id;
$user_guid = (int) $user_guid;
$collections = get_write_access_array();
if (in_array($collection_id, $collections) && $user = get_user($user_guid)) {
global $CONFIG;
delete_data("delete from {$CONFIG->dbprefix}access_collection_membership where access_collection_id = {$collection_id} and user_guid = {$user_guid}");
return true;
}
return false;
}
/**
* Some useful constant definitions
*/
define('ACCESS_PRIVATE',0);
define('ACCESS_LOGGED_IN',1);
define('ACCESS_PUBLIC',2);
?>
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