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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/
*/
/**
* @class ElggMetadata
* @author Marcus Povey <marcus@dushka.co.uk>
*/
class ElggMetadata
{
/**
* This contains the site's main properties (id, etc)
* @var array
*/
private $attributes;
/**
* 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] = $value;
}
}
}
}
function __get($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;
}
function __set($name, $value) {
$this->attributes[$name] = $value;
return true;
}
/**
* Return the owner of this metadata.
*
* @return mixed
*/
function getOwner() { return get_user($this->owner_id); }
function save()
{
if ($this->id > 0)
return update_metadata($this->id, $this->name, $this->value, $this->value_type, $this->owner_id, $this->access_id);
else
{
$this->id = create_metadata($this->object_id, $this->object_type, $this->name, $this->value, $this->value_type, $this->owner_id, $this->access_id);
if (!$this->id) throw new IOException("Unable to save new ElggAnnotation");
return $this->id;
}
}
/**
* Delete a given site.
*/
function delete() { return delete_metadata($this->id); }
}
/**
* 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';
}
/**
* Create a new metadata object, or update an existing one.
*
* @param int $object_id
* @param string $object_type
* @param string $name
* @param string $value
* @param string $value_type
* @param int $owner_id
* @param int $access_id
*/
function create_metadata($object_id, $object_type, $name, $value, $value_type, $owner_id, $access_id = 0)
{
global $CONFIG;
$object_id = (int)$object_id;
$object_type = sanitise_string(trim($object_type));
$name = sanitise_string(trim($name));
$value = sanitise_string(trim($value));
$value_type = detect_metadata_valuetype(sanitise_string(trim($value_type)));
$time = time();
$owner_id = (int)$owner_id;
if ($owner_id==0) $owner_id = $_SESSION['id'];
$access_id = (int)$access_id;
$id = false;
$existing = get_data_row("SELECT * from {$CONFIG->dbprefix}metadata WHERE object_id = $object_id and object_type='$object_type' and name='$name' limit 1");
if ($existing)
{
$id = $existing->id;
$result = update_metadata($id,$name, $value, $value_type, $owner_id, $access_id);
if (!$result) return false;
}
else
{
$id = insert_data("INSERT into {$CONFIG->dbprefix}metadata (object_id, object_type, name, value, value_type, owner_id, created, access_id) VALUES ($object_id,'$object_type','$name','$value','$value_type', $owner_id, $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_id
* @param int $access_id
*/
function update_metadata($id, $name, $value, $value_type, $owner_id, $access_id)
{
global $CONFIG;
$id = (int)$id;
$name = sanitise_string(trim($name));
$value = sanitise_string(trim($value));
$value_type = detect_metadata_valuetype(sanitise_string(trim($value_type)));
$owner_id = (int)$owner_id;
if ($owner_id==0) $owner_id = $_SESSION['id'];
$access_id = (int)$access_id;
$access = get_access_list();
return update_data("UPDATE {$CONFIG->dbprefix}metadata set value='$value', value_type='$value_type', access_id=$access_id, owner_id=$owner_id where id=$id and name='$name' and (access_id in {$access} or (access_id = 0 and owner_id = {$_SESSION['id']}))");
}
/**
* Get a specific item of metadata.
*
* @param $id int The item of metadata being retrieved.
*/
function get_metadata($id)
{
global $CONFIG;
$id = (int)$id;
$access = get_access_list();
return get_data_row("SELECT * from {$CONFIG->dbprefix}metadata where id=$id and (access_id in {$access} or (access_id = 0 and owner_id = {$_SESSION['id']}))");
}
/**
* Get a list of metadatas for a given object/user/metadata type.
*
* @param int $object_id
* @param string $object_type
* @param int $owner_id
* @param string $order_by
* @param int $limit
* @param int $offset
* @return array of ElggMetadata
*/
function get_metadatas($object_id = 0, $object_type = "", $owner_id = 0, $order_by = "created desc", $limit = 10, $offset = 0)
{
global $CONFIG;
$object_id = (int)$object_id;
$object_type = sanitise_string(trim($object_type));
$name = sanitise_string(trim($name));
$value = sanitise_string(trim($value));
$owner_id = (int)$owner_id;
if ($owner_id==0) $owner_id = $_SESSION['id'];
$limit = (int)$limit;
$offset = (int)$offset;
// Construct query
$where = array();
if ($object_id != 0)
$where[] = "object_id=$object_id";
if ($object_type != "")
$where[] = "object_type='$object_type'";
if ($owner_id != 0)
$where[] = "owner_id=$owner_id";
// add access controls
$access = get_access_list();
$where[] = "(access_id in {$access} or (access_id = 0 and owner_id = {$_SESSION['id']}))";
// construct query.
$query = "SELECT * from {$CONFIG->dbprefix}metadata where ";
for ($n = 0; $n < count($where); $n++)
{
if ($n > 0) $query .= " and ";
$query .= $where[$n];
}
return get_data($query);
}
/**
* 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;
$access = get_access_list();
return delete_data("DELETE from {$CONFIG->dbprefix}metadata where id=$id and (access_id in {$access} or (access_id = 0 and owner_id = {$_SESSION['id']}))");
}
?>
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