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<?php
/**
* Elgg Entity Extender.
* This file contains ways of extending an Elgg entity in custom ways.
*
* @package Elgg
* @subpackage Core
* @license http://www.gnu.org/licenses/old-licenses/gpl-2.0.html GNU Public License version 2
* @author Marcus Povey
* @copyright Curverider Ltd 2008
* @link http://elgg.org/
*/
/**
* @class ElggExtender
* @author Marcus Povey
*/
abstract class ElggExtender implements Exportable, Importable
{
/**
* This contains the site's main properties (id, etc)
* @var array
*/
protected $attributes;
protected function get($name) {
if (isset($this->attributes[$name])) {
// Sanitise value if necessary
if ($name=='value')
{
switch ($this->attributes['value_type'])
{
case 'integer' : return (int)$this->attributes['value'];
case 'tag' :
case 'text' :
case 'file' : return sanitise_string($this->attributes['value']);
default : throw new InstallationException("Type {$this->attributes['value_type']} is not supported. This indicates an error in your installation, most likely caused by an incomplete upgrade.");
}
}
return $this->attributes[$name];
}
return null;
}
protected function set($name, $value) {
$this->attributes[$name] = $value;
return true;
}
/**
* Return the owner of this annotation.
*
* @return mixed
*/
public function getOwner()
{
return get_user($this->owner_guid);
}
/**
* Save this data to the appropriate database table.
*/
abstract public function save();
/**
* Delete this data.
*/
abstract public function delete();
/**
* Determines whether or not the specified user can edit this
*
* @param int $user_guid The GUID of the user (defaults to currently logged in user)
* @return true|false
*/
function canEdit($user_guid = 0) {
return can_edit_extender($this->id,$this->type,$user_guid);
}
public function export()
{
$tmp = new stdClass;
$tmp->attributes = $this->attributes;
$tmp->attributes['owner_uuid'] = guid_to_uuid($this->owner_guid);
$tmp->attributes['entity_uuid'] = guid_to_uuid($this->entity_guid);
return $tmp;
}
public function import(array $data, $version = 1)
{
if ($version == 1)
{
$entity_uuid = NULL;
// Get attributes
foreach ($data['elements'][0]['elements'] as $attr)
{
$name = strtolower($attr['name']);
$text = $attr['text'];
switch ($name)
{
case 'id' : break;
case 'entity_uuid' : $entity_uuid = $text; break;
default : $this->attributes[$name] = $text;
}
}
// See if this entity has already been imported, if so then we need to link to it
$entity = get_entity_from_uuid($entity_uuid);
if (!$entity)
throw new ImportException("Sorry $entity_uuid was not found. Could not import annotation.");
// Set the item ID
$this->attributes['entity_guid'] = $entity->getGUID();
// Set owner
$this->attributes[$name] = $entity->getOwner();
// save
$result = $this->save();
if (!$result)
throw new ImportException("There was a problem saving the ElggExtender");
return $this;
}
else
throw new ImportException("Unsupported version ($version) passed to ElggAnnotation::import()");
}
}
/**
* Handler called by trigger_plugin_hook on the "import" event.
*/
function import_extender_plugin_hook($hook, $entity_type, $returnvalue, $params)
{
$name = $params['name'];
$element = $params['element'];
$tmp = NULL;
switch ($name)
{
case 'ElggAnnotation' : $tmp = new ElggAnnotation(); break;
case 'ElggMetadata' : $tmp = new ElggMetadata(); break;
}
if ($tmp)
{
$tmp->import($element);
return $tmp;
}
}
/**
* Determines whether or not the specified user can edit the specified piece of extender
*
* @param int $extender_id The ID of the piece of extender
* @param string $type 'metadata' or 'annotation'
* @param int $user_guid The GUID of the user
* @return true|false
*/
function can_edit_extender($extender_id, $type, $user_guid = 0) {
if ($user_guid == 0) {
$user = $_SESSION['user'];
} else {
$user = get_entity($user_guid);
}
$functionname = "get_{$type}";
if (is_callable($functionname)) {
$extender = $functionname($extender_id);
} else return false;
if ($extender->getOwner() == $user->getGUID()) return true;
return trigger_plugin_hook('permissions_check',$type,array('entity' => $entity, 'user' => $user),false);
}
/** Register the hook */
register_plugin_hook("import", "all", "import_extender_plugin_hook", 2);
?>
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