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<?php
/**
* Elgg Entity Extender.
* This file contains ways of extending an Elgg entity in custom ways.
*
* @package Elgg.Core
* @subpackage DataModel.Extender
*/
/**
* Detect the value_type for a given value.
* Currently this is very crude.
*
* @todo Make better!
*
* @param mixed $value The 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';
}
// Catch floating point values which are not integer
if (is_numeric($value)) {
return 'text';
}
return 'text';
}
/**
* Utility function used by import_extender_plugin_hook() to process
* an ODDMetaData and add it to an entity. This function does not
* hit ->save() on the entity (this lets you construct in memory)
*
* @param ElggEntity $entity The entity to add the data to.
* @param ODDMetaData $element The OpenDD element
*
* @return bool
*/
function oddmetadata_to_elggextender(ElggEntity $entity, ODDMetaData $element) {
// Get the type of extender (metadata, type, attribute etc)
$type = $element->getAttribute('type');
$attr_name = $element->getAttribute('name');
$attr_val = $element->getBody();
switch ($type) {
// Ignore volatile items
case 'volatile' :
break;
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_updated', $attr_time);
}
return true;
}
/**
* Handler called by trigger_plugin_hook on the "import" event.
*
* @param string $hook volatile
* @param string $entity_type metadata
* @param string $returnvalue Return value from previous hook
* @param array $params The parameters
*
* @return null
* @elgg_plugin_hook_handler volatile metadata
* @todo investigate more.
* @access private
*/
function import_extender_plugin_hook($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 (!$entity) {
throw new ImportException(elgg_echo('ImportException:GUIDNotFound', array($entity_uuid)));
}
oddmetadata_to_elggextender($entity, $element);
// Save
if (!$entity->save()) {
$msg = elgg_echo('ImportException:ProblemUpdatingMeta', array($attr_name, $entity_uuid));
throw new ImportException($msg);
}
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 (!isloggedin()) {
return false;
}
$user_guid = (int)$user_guid;
$user = get_entity($user_guid);
if (!$user) {
$user = get_loggedin_user();
}
$functionname = "get_{$type}";
if (is_callable($functionname)) {
$extender = $functionname($extender_id);
} else {
return false;
}
if (!is_a($extender, "ElggExtender")) {
return false;
}
// If the owner is the specified user, great! They can edit.
if ($extender->getOwnerGUID() == $user->getGUID()) {
return true;
}
// If the user can edit the entity this is attached to, great! They can edit.
if (can_edit_entity($extender->entity_guid, $user->getGUID())) {
return true;
}
// Trigger plugin hooks
$params = array('entity' => $entity, 'user' => $user);
return elgg_trigger_plugin_hook('permissions_check', $type, $params, false);
}
/**
* Sets the URL handler for a particular extender type and name.
* It is recommended that you do not call this directly, instead use
* one of the wrapper functions in the subtype files.
*
* @param string $function_name The function to register
* @param string $extender_type Extender type
* @param string $extender_name The name of the extender
*
* @return true|false Depending on success
*/
function register_extender_url_handler($function_name, $extender_type = "all",
$extender_name = "all") {
global $CONFIG;
if (!is_callable($function_name)) {
return false;
}
if (!isset($CONFIG->extender_url_handler)) {
$CONFIG->extender_url_handler = array();
}
if (!isset($CONFIG->extender_url_handler[$extender_type])) {
$CONFIG->extender_url_handler[$extender_type] = array();
}
$CONFIG->extender_url_handler[$extender_type][$extender_name] = $function_name;
return true;
}
/**
* Get the URL of a given elgg extender.
* Used by get_annotation_url and get_metadata_url.
*
* @param ElggExtender $extender An extender object
*
* @return string
*/
function get_extender_url(ElggExtender $extender) {
global $CONFIG;
$view = elgg_get_viewtype();
$guid = $extender->entity_guid;
$type = $extender->type;
$url = "";
$function = "";
if (isset($CONFIG->extender_url_handler[$type][$extender->name])) {
$function = $CONFIG->extender_url_handler[$type][$extender->name];
}
if (isset($CONFIG->extender_url_handler[$type]['all'])) {
$function = $CONFIG->extender_url_handler[$type]['all'];
}
if (isset($CONFIG->extender_url_handler['all']['all'])) {
$function = $CONFIG->extender_url_handler['all']['all'];
}
if (is_callable($function)) {
$url = $function($extender);
}
if ($url == "") {
$nameid = $extender->id;
if ($type == 'volatile') {
$nameid == $extender->name;
}
$url = "export/$view/$guid/$type/$nameid/";
}
return elgg_normalize_url($url);
}
/** Register the hook */
elgg_register_plugin_hook_handler("import", "all", "import_extender_plugin_hook", 2);
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