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<?php
/**
* Elgg metadata
* Functions to manage object metadata.
*
* @package Elgg
* @subpackage Core
* @license http://www.gnu.org/licenses/old-licenses/gpl-2.0.html GNU Public License version 2
* @author Marcus Povey <marcus@dushka.co.uk>
* @copyright Curverider Ltd 2008
* @link http://elgg.org/
*/
/**
* ElggMetadata
* This class describes metadata that can be attached to ElggEntities.
*
* @author Marcus Povey <marcus@dushka.co.uk>
* @package Elgg
* @subpackage Core
*/
class ElggMetadata extends ElggExtender
{
/**
* Construct a new site object, optionally from a given id value or row.
*
* @param mixed $id
*/
function __construct($id = null)
{
$this->attributes = array();
if (!empty($id)) {
if ($id instanceof stdClass)
$metadata = $id; // Create from db row
else
$metadata = get_metadata($id);
if ($metadata) {
$objarray = (array) $metadata;
foreach($objarray as $key => $value) {
$this->attributes[$key] = $value;
}
$this->attributes['type'] = "metadata";
}
}
}
/**
* Class member get overloading
*
* @param string $name
* @return mixed
*/
function __get($name) {
return $this->get($name);
}
/**
* Class member set overloading
*
* @param string $name
* @param mixed $value
* @return mixed
*/
function __set($name, $value) {
return $this->set($name, $value);
}
/**
* Save matadata object
*
* @return int the metadata object id
*/
function save()
{
if ($this->id > 0)
return update_metadata($this->id, $this->name, $this->value, $this->value_type, $this->owner_guid, $this->access_id);
else
{
$this->id = create_metadata($this->entity_guid, $this->name, $this->value, $this->value_type, $this->owner_guid, $this->access_id);
if (!$this->id) throw new IOException("Unable to save new ElggAnnotation");
return $this->id;
}
}
/**
* Delete a given metadata.
*/
function delete()
{
return delete_metadata($this->id);
}
}
/**
* Convert a database row to a new ElggMetadata
*
* @param stdClass $row
* @return stdClass or ElggMetadata
*/
function row_to_elggmetadata($row)
{
if (!($row instanceof stdClass))
return $row;
return new ElggMetadata($row);
}
/**
* Detect the value_type for a given value.
* Currently this is very crude.
*
* TODO: Make better!
*
* @param mixed $value
* @param string $value_type If specified, overrides the detection.
* @return string
*/
function detect_metadata_valuetype($value, $value_type = "")
{
if ($value_type!="")
return $value_type;
// This is crude
if (is_int($value)) return 'integer';
return 'tag';
}
/**
* Get a specific item of metadata.
*
* @param $id int The item of metadata being retrieved.
*/
function get_metadata($id)
{
global $CONFIG;
$id = (int)$id;
$access = get_access_list();
return row_to_elggmetadata(get_data_row("SELECT m.*, n.string as name, v.string as value from {$CONFIG->dbprefix}metadata m JOIN {$CONFIG->dbprefix}metastrings v on m.value_id = v.id JOIN {$CONFIG->dbprefix}metastrings n on m.name_id = n.id where m.id=$id and (m.access_id in {$access} or (m.access_id = 0 and m.owner_guid = {$_SESSION['id']}))"));
}
/**
* Create a new metadata object, or update an existing one.
*
* @param int $entity_guid
* @param string $name
* @param string $value
* @param string $value_type
* @param int $owner_guid
* @param int $access_id
* @param bool $allow_multiple
*/
function create_metadata($entity_guid, $name, $value, $value_type, $owner_guid, $access_id = 0, $allow_multiple = false)
{
global $CONFIG;
$entity_guid = (int)$entity_guid;
$name = sanitise_string(trim($name));
$value = sanitise_string(trim($value));
$value_type = detect_metadata_valuetype($value, sanitise_string(trim($value_type)));
$time = time();
$owner_guid = (int)$owner_guid;
$allow_multiple = (boolean)$allow_multiple;
if ($owner_guid==0) $owner_guid = $_SESSION['id'];
$access_id = (int)$access_id;
$id = false;
$existing = get_data_row("SELECT * from {$CONFIG->dbprefix}metadata WHERE entity_guid = $entity_guid and name_id=" . add_metastring($name) . " limit 1");
if (($existing) && (!$allow_multiple))
{
$id = $existing->id;
$result = update_metadata($id, $name, $value, $value_type, $owner_guid, $access_id);
if (!$result) return false;
}
else
{
// Add the metastrings
$value = add_metastring($value);
if (!$value) return false;
$name = add_metastring($name);
if (!$name) return false;
// If ok then add it
$id = insert_data("INSERT into {$CONFIG->dbprefix}metadata (entity_guid, name_id, value_id, value_type, owner_guid, time_created, access_id) VALUES ($entity_guid, '$name','$value','$value_type', $owner_guid, $time, $access_id)");
}
return $id;
}
/**
* Update an item of metadata.
*
* @param int $id
* @param string $name
* @param string $value
* @param string $value_type
* @param int $owner_guid
* @param int $access_id
*/
function update_metadata($id, $name, $value, $value_type, $owner_guid, $access_id)
{
global $CONFIG;
$id = (int)$id;
$name = sanitise_string(trim($name));
$value = sanitise_string(trim($value));
$value_type = detect_metadata_valuetype($value, sanitise_string(trim($value_type)));
$owner_guid = (int)$owner_guid;
if ($owner_guid==0) $owner_guid = $_SESSION['id'];
$access_id = (int)$access_id;
$access = get_access_list();
// Add the metastring
$value = add_metastring($value);
if (!$value) return false;
$name = add_metastring($name);
if (!$name) return false;
// If ok then add it
return update_data("UPDATE {$CONFIG->dbprefix}metadata set value_id='$value', value_type='$value_type', access_id=$access_id, owner_guid=$owner_guid where id=$id and name_id='$name' and (access_id in {$access} or (access_id = 0 and owner_guid = {$_SESSION['id']}))");
}
/**
* This function creates metadata from an associative array of "key => value" pairs.
*
* @param int $entity_guid
* @param string $name_and_values
* @param string $value_type
* @param int $owner_guid
* @param int $access_id
* @param bool $allow_multiple
*/
function create_metadata_from_array($entity_guid, array $name_and_values, $value_type, $owner_guid, $access_id = 0, $allow_multiple = false)
{
foreach ($name_and_values as $k => $v)
if (!create_metadata($entity_guid, $k, $v, $value_type, $owner_guid, $access_id, $allow_multiple)) return false;
return true;
}
/**
* Delete an item of metadata, where the current user has access.
*
* @param $id int The item of metadata to delete.
*/
function delete_metadata($id)
{
global $CONFIG;
$id = (int)$id;
$metadata = get_metadata($id);
if ($metadata->canEdit())
return delete_data("DELETE from {$CONFIG->dbprefix}metadata where id=$id");
}
/**
* Return the metadata values that match your query.
*
* @param string $meta_name
* @return mixed either a value, an array of ElggMetadata or false.
*/
function get_metadata_byname($entity_guid, $meta_name)
{
global $CONFIG;
$meta_name = get_metastring_id($meta_name);
$entity_guid = (int)$entity_guid;
$access = get_access_list();
$result = get_data("SELECT m.*, n.string as name, v.string as value from {$CONFIG->dbprefix}metadata m JOIN {$CONFIG->dbprefix}metastrings v on m.value_id = v.id JOIN {$CONFIG->dbprefix}metastrings n on m.name_id = n.id where m.entity_guid=$entity_guid and m.name_id='$meta_name' and (m.access_id in {$access} or (m.access_id = 0 and m.owner_guid = {$_SESSION['id']}))", "row_to_elggmetadata");
if (!$result)
return false;
if (count($result) == 1)
return $result[0];
return $result;
}
/**
* Return all the metadata for a given GUID.
*
* @param int $entity_guid
*/
function get_metadata_for_entity($entity_guid)
{
global $CONFIG;
$entity_guid = (int)$entity_guid;
$access = get_access_list();
return get_data("SELECT m.*, n.string as name, v.string as value from {$CONFIG->dbprefix}metadata m JOIN {$CONFIG->dbprefix}metastrings v on m.value_id = v.id JOIN {$CONFIG->dbprefix}metastrings n on m.name_id = n.id where m.entity_guid=$entity_guid and (m.access_id in {$access} or (m.access_id = 0 and m.owner_guid = {$_SESSION['id']}))", "row_to_elggmetadata");
}
/**
* Return a list of entities based on the given search criteria.
*
* @param mixed $meta_name
* @param mixed $meta_value
* @param string $entity_type The type of entity to look for, eg 'site' or 'object'
* @param string $entity_subtype The subtype of the entity.
* @param int $limit
* @param int $offset
* @param string $order_by Optional ordering.
*/
function get_entities_from_metadata($meta_name, $meta_value = "", $entity_type = "", $entity_subtype = "", $limit = 10, $offset = 0, $order_by = "e.time_created desc")
{
global $CONFIG;
$meta_n = get_metastring_id($meta_name);
$meta_v = get_metastring_id($meta_value);
$entity_type = sanitise_string($entity_type);
$entity_subtype = get_subtype_id($entity_type, $entity_subtype);
$limit = (int)$limit;
$offset = (int)$offset;
$order_by = sanitise_string($order_by);
$access = get_access_list();
$where = array();
if ($entity_type!="")
$where[] = "e.type='$entity_type'";
if ($entity_subtype)
$where[] = "e.subtype=$entity_subtype";
if ($meta_name!="")
$where[] = "m.name_id='$meta_n'";
if ($meta_value!="")
$where[] = "m.value_id='$meta_v'";
$query = "SELECT * from {$CONFIG->dbprefix}entities e JOIN {$CONFIG->dbprefix}metadata m on e.guid = m.entity_guid where";
foreach ($where as $w)
$query .= " $w and ";
$query .= " (e.access_id in {$access} or (e.access_id = 0 and e.owner_guid = {$_SESSION['id']}))"; // Add access controls
$query .= " order by $order_by limit $offset, $limit"; // Add order and limit
return get_data($query, "entity_row_to_elggstar");
}
/**
* Clear all the metadata for a given entity, assuming you have access to that metadata.
*
* @param int $guid
*/
function clear_metadata($entity_guid)
{
global $CONFIG;
$entity_guid = (int)$entity_guid;
if ($entity = get_entity($entity_guid)) {
if ($entity->canEdit())
return delete_data("DELETE from {$CONFIG->dbprefix}metadata where entity_guid={$entity_guid}");
}
return false;
}
/**
* Handler called by trigger_plugin_hook on the "export" event.
*/
function export_metadata_plugin_hook($hook, $entity_type, $returnvalue, $params)
{
// Sanity check values
if ((!is_array($params)) && (!isset($params['guid'])))
throw new InvalidParameterException("GUID has not been specified during export, this should never happen.");
if (!is_array($returnvalue))
throw new InvalidParameterException("Entity serialisation function passed a non-array returnvalue parameter");
$guid = (int)$params['guid'];
$name = $params['name'];
$result = get_metadata_for_entity($guid);
if ($result)
{
foreach ($result as $r)
$returnvalue[] = $r;
}
return $returnvalue;
}
/**
* Takes in a comma-separated string and returns an array of tags which have been trimmed and set to lower case
*
* @param string $string Comma-separated tag string
* @return array|false An array of strings, or false on failure
*/
function string_to_tag_array($string) {
if (is_string($string)) {
$ar = explode(",",$string);
array_walk($ar,'trim');
array_walk($ar,'strtolower');
return $ar;
}
return false;
}
/**
* Takes a metadata array (which has all kinds of properties) and turns it into a simple array of strings
*
* @param array $array Metadata array
* @return array Array of strings
*/
function metadata_array_to_values($array) {
$valuearray = array();
if (is_array($array)) {
foreach($array as $element) {
$valuearray[] = $element->value;
}
}
return $valuearray;
}
/** Register the hook */
register_plugin_hook("export", "all", "export_metadata_plugin_hook", 2);
?>
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