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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/
*/
/**
* ElggExtender
*
* @author Marcus Povey
* @package Elgg
* @subpackage Core
*/
abstract class ElggExtender implements Exportable
{
/**
* This contains the site's main properties (id, etc)
* @var array
*/
protected $attributes;
/**
* Get an attribute
*
* @param string $name
* @return mixed
*/
protected function get($name) {
if (isset($this->attributes[$name])) {
// Sanitise value if necessary
if ($name=='value')
{
switch ($this->attributes['value_type'])
{
case 'integer' : return (int)$this->attributes['value'];
//case 'tag' :
//case 'file' :
case 'text' : return ($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;
}
/**
* Set an attribute
*
* @param string $name
* @param mixed $value
* @param string $value_type
* @return boolean
*/
protected function set($name, $value, $value_type = "") {
$this->attributes[$name] = $value;
$this->attributes['value_type'] = detect_extender_valuetype($value, $value_type);
return true;
}
/**
* Return the owner of this annotation.
*
* @return mixed
*/
public function getOwner()
{
return get_user($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 $user_guid The GUID of the user (defaults to currently logged in user)
* @return true|false
*/
public function canEdit($user_guid = 0) {
return can_edit_extender($this->id,$this->type,$user_guid);
}
/**
* Export this object
*
* @return array
*/
public function export()
{
$type = $this->attributes['type'];
$uuid = guid_to_uuid($this->entity_guid). $type . "/{$this->id}/";
$meta = new ODDMetadata($uuid, guid_to_uuid($this->entity_guid), $this->attributes[$name], $this->attributes['value'], $type, guid_to_uuid($this->owner_guid));
$meta->setAttribute('published', date("r", $this->time_created));
return $meta;
}
}
/**
* Detect the value_type for a given value.
* Currently this is very crude.
*
* TODO: Make better!
*
* @param mixed $value
* @param string $value_type If specified, overrides the detection.
* @return string
*/
function detect_extender_valuetype($value, $value_type = "")
{
if ($value_type!="")
return $value_type;
// This is crude
if (is_int($value)) return 'integer';
if (is_numeric($value)) return 'integer';
return 'text';
}
/**
* Handler called by trigger_plugin_hook on the "import" event.
*/
function import_extender_plugin_hook($hook, $entity_type, $returnvalue, $params)
{
$element = $params['element'];
$tmp = NULL;
if ($element instanceof ODDMetaData)
{
// Recall entity
$entity_uuid = $element->getAttribute('entity_uuid');
$entity = get_entity_from_uuid($entity_uuid);
if (!$entity)
throw new ImportException("Entity '$entity_uuid' could not be found.");
// Get the type of extender (metadata, type, attribute etc)
$type = $element->getAttribute('type');
$attr_name = $element->getAttribute('name');
$attr_val = $element->getBody();
switch ($type)
{
case 'annotation' :
$entity->annotate($attr_name, $attr_val);
break;
case 'metadata' :
$entity->setMetaData($attr_name, $attr_val, "", true);
break;
default : // Anything else assume attribute
$entity->set($attr_name, $attr_val);
}
// Set time if appropriate
$attr_time = $element->getAttribute('published');
if ($attr_time)
$entity->set('time_created', $attr_time);
// Save
if (!$entity->save())
throw new ImportException("There was a problem updating entity '$entity_uuid'");
return true;
}
}
/**
* 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 the owner is the specified user, great! They can edit.
if ($extender->getOwner() == $user->getGUID()) return true;
// If the user can edit the entity this is attached to, great! They can edit.
if (can_edit_entity($extender->entity_guid,$user->getGUID())) return true;
// Trigger plugin hooks
return trigger_plugin_hook('permissions_check',$type,array('entity' => $entity, 'user' => $user),false);
}
/** Register the hook */
register_plugin_hook("import", "all", "import_extender_plugin_hook", 2);
?>
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