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<?php
/**
* Elgg entities.
* Functions to manage all elgg entities (sites, collections, objects and users).
*
* @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/
*/
/// Cache objects in order to minimise database access.
$ENTITY_CACHE = array();
/// Cache subtype searches
$SUBTYPE_CACHE = array();
/**
* ElggEntity The elgg entity superclass
* This class holds methods for accessing the main entities table.
*
* @author Marcus Povey <marcus@dushka.co.uk>
* @package Elgg
* @subpackage Core
*/
abstract class ElggEntity implements
Exportable, // Allow export of data
Importable, // Allow import of data
Loggable, // Can events related to this object class be logged
Iterator, // Override foreach behaviour
ArrayAccess // Override for array access
{
/**
* The main attributes of an entity.
* Blank entries for all database fields should be created by the constructor.
* Subclasses should add to this in their constructors.
* Any field not appearing in this will be viewed as a
*/
protected $attributes;
/**
* If set, overrides the value of getURL()
*/
protected $url_override;
/**
* Icon override, overrides the value of getIcon().
*/
protected $icon_override;
/**
* Temporary cache for metadata, permitting meta data access before a guid has obtained.
*/
protected $temp_metadata;
/**
* Temporary cache for annotations, permitting meta data access before a guid has obtained.
*/
protected $temp_annotations;
/**
* Initialise the attributes array.
* This is vital to distinguish between metadata and base parameters.
*
* Place your base parameters here.
*
* @return void
*/
protected function initialise_attributes()
{
initialise_entity_cache();
// Create attributes array if not already created
if (!is_array($this->attributes)) $this->attributes = array();
if (!is_array($this->temp_metadata)) $this->temp_metadata = array();
if (!is_array($this->temp_annotations)) $this->temp_annotations = array();
$this->attributes['guid'] = "";
$this->attributes['type'] = "";
$this->attributes['subtype'] = "";
$this->attributes['owner_guid'] = $_SESSION['guid'];
$this->attributes['container_guid'] = $_SESSION['guid'];
$this->attributes['site_guid'] = 0;
$this->attributes['access_id'] = 0;
$this->attributes['time_created'] = "";
$this->attributes['time_updated'] = "";
// There now follows a bit of a hack
/* Problem: To speed things up, some objects are split over several tables, this means that it requires
* n number of database reads to fully populate an entity. This causes problems for caching and create events
* since it is not possible to tell whether a subclassed entity is complete.
* Solution: We have two counters, one 'tables_split' which tells whatever is interested how many tables
* are going to need to be searched in order to fully populate this object, and 'tables_loaded' which is how
* many have been loaded thus far.
* If the two are the same then this object is complete.
*
* Use: isFullyLoaded() to check
*/
$this->attributes['tables_split'] = 1;
$this->attributes['tables_loaded'] = 0;
}
/**
* Return the value of a given key.
* If $name is a key field (as defined in $this->attributes) that value is returned, otherwise it will
* then look to see if the value is in this object's metadata.
*
* Q: Why are we not using __get overload here?
* A: Because overload operators cause problems during subclassing, so we put the code here and
* create overloads in subclasses.
*
* @param string $name
* @return mixed Returns the value of a given value, or null.
*/
public function get($name)
{
// See if its in our base attribute
if (isset($this->attributes[$name])) {
return $this->attributes[$name];
}
// No, so see if its in the meta data for this entity
$meta = $this->getMetaData($name);
if ($meta)
return $meta;
// Can't find it, so return null
return null;
}
/**
* Set the value of a given key, replacing it if necessary.
* If $name is a base attribute (as defined in $this->attributes) that value is set, otherwise it will
* set the appropriate item of metadata.
*
* Note: It is important that your class populates $this->attributes with keys for all base attributes, anything
* not in their gets set as METADATA.
*
* Q: Why are we not using __set overload here?
* A: Because overload operators cause problems during subclassing, so we put the code here and
* create overloads in subclasses.
*
* @param string $name
* @param mixed $value
*/
public function set($name, $value)
{
if (array_key_exists($name, $this->attributes))
{
// Check that we're not trying to change the guid!
if ((array_key_exists('guid', $this->attributes)) && ($name=='guid'))
return false;
$this->attributes[$name] = $value;
}
else
return $this->setMetaData($name, $value);
return true;
}
/**
* Get a given piece of metadata.
*
* @param string $name
*/
public function getMetaData($name)
{
if ((int) ($this->guid) > 0) {
$md = get_metadata_byname($this->getGUID(), $name);
} else {
if (isset($this->temp_metadata[$name]))
return $this->temp_metadata[$name];
}
if ($md && !is_array($md)) {
return $md->value;
} else if ($md && is_array($md)) {
return metadata_array_to_values($md);
}
return null;
}
/**
* Set a piece of metadata.
*
* @param string $name
* @param mixed $value
* @param string $value_type
* @param bool $multiple
* @return bool
*/
public function setMetaData($name, $value, $value_type = "", $multiple = false)
{
if (is_array($value))
{
remove_metadata($this->getGUID(), $name);
$multiple = true;
foreach ($value as $v) {
if ((int) $this->guid > 0) {
if (!create_metadata($this->getGUID(), $name, $v, $value_type, $this->getOwner(), $this->getAccessID(), $multiple)) return false;
} else {
if (($multiple) && (isset($this->temp_metadata[$name])))
{
if (!is_array($this->temp_metadata[$name]))
{
$tmp = $this->temp_metadata[$name];
$this->temp_metadata[$name] = array();
$this->temp_metadata[$name][] = $tmp;
}
$this->temp_metadata[$name][] = $value;
}
else
$this->temp_metadata[$name] = $value;
}
}
return true;
}
else
{
if ((int) $this->guid > 0) {
return create_metadata($this->getGUID(), $name, $value, $value_type, $this->getOwner(), $this->getAccessID(), $multiple);
} else {
//$this->temp_metadata[$name] = $value;
if (($multiple) && (isset($this->temp_metadata[$name])))
{
if (!is_array($this->temp_metadata[$name]))
{
$tmp = $this->temp_metadata[$name];
$this->temp_metadata[$name] = array();
$this->temp_metadata[$name][] = $tmp;
}
$this->temp_metadata[$name][] = $value;
}
else
$this->temp_metadata[$name] = $value;
return true;
}
}
}
/**
* Clear metadata.
*/
public function clearMetaData($name = "")
{
if (empty($name)) {
return clear_metadata($this->getGUID());
} else {
return remove_metadata($this->getGUID(),$name);
}
}
/**
* Remove all entities associated with this entity
*
* @return true
*/
public function clearRelationships() {
remove_entity_relationships($this->getGUID());
remove_entity_relationships($this->getGUID(),"",true);
return true;
}
/**
* Adds an annotation to an entity. By default, the type is detected automatically; however,
* it can also be set. Note that by default, annotations are private.
*
* @param string $name
* @param mixed $value
* @param int $access_id
* @param int $owner_id
* @param string $vartype
*/
function annotate($name, $value, $access_id = 0, $owner_id = 0, $vartype = "")
{
if ((int) $this->guid > 0) {
return create_annotation($this->getGUID(), $name, $value, $vartype, $owner_id, $access_id);
} else {
$this->temp_annotations[$name] = $value;
}
return true;
}
/**
* Get the annotations for an entity.
*
* @param string $name
* @param int $limit
* @param int $offset
* @param string $order
*/
function getAnnotations($name, $limit = 50, $offset = 0, $order="asc")
{
if ((int) ($this->guid) > 0) {
return get_annotations($this->getGUID(), "", "", $name, "", 0, $limit, $offset, $order);
} else {
return $this->temp_annotations[$name];
}
}
/**
* Remove all annotations or all annotations for this entity.
*
* @param string $name
*/
function clearAnnotations($name = "")
{
return clear_annotations($this->getGUID(), $name);
}
/**
* Return the annotations for the entity.
*
* @param string $name The type of annotation.
*/
function countAnnotations($name)
{
return count_annotations($this->getGUID(), "","",$name);
}
/**
* Get the average of an integer type annotation.
*
* @param string $name
*/
function getAnnotationsAvg($name)
{
return get_annotations_avg($this->getGUID(), "","",$name);
}
/**
* Get the sum of integer type annotations of a given name.
*
* @param string $name
*/
function getAnnotationsSum($name)
{
return get_annotations_sum($this->getGUID(), "","",$name);
}
/**
* Get the minimum of integer type annotations of given name.
*
* @param string $name
*/
function getAnnotationsMin($name)
{
return get_annotations_min($this->getGUID(), "","",$name);
}
/**
* Get the maximum of integer type annotations of a given name.
*
* @param string $name
*/
function getAnnotationsMax($name)
{
return get_annotations_max($this->getGUID(), "","",$name);
}
/**
* Gets an array of entities from a specific relationship type
*
* @param string $relationship Relationship type (eg "friends")
* @param true|false $inverse Is this an inverse relationship?
* @param int $limit Number of elements to return
* @param int $offset Indexing offset
* @return array|false An array of entities or false on failure
*/
function getEntitiesFromRelationship($relationship, $inverse = false, $limit = 50, $offset = 0) {
return get_entities_from_relationship($relationship,$this->getGUID(),$inverse,"","","","time_created desc",$limit,$offset);
}
/**
* Gets the number of of entities from a specific relationship type
*
* @param string $relationship Relationship type (eg "friends")
* @return int|false The number of entities or false on failure
*/
function countEntitiesFromRelationship($relationship) {
return get_entities_from_relationship($relationship,$this->getGUID(),false,"","","","time_created desc",null,null,true);
}
/**
* Determines whether or not the specified user (by default the current one) can edit the entity
*
* @param int $user_guid The user GUID, optionally (defaults to the currently logged in user)
* @return true|false
*/
function canEdit($user_guid = 0) {
return can_edit_entity($this->getGUID(),$user_guid);
}
/**
* Determines whether or not the specified user (by default the current one) can edit metadata on the entity
*
* @param ElggMetadata $metadata The piece of metadata to specifically check
* @param int $user_guid The user GUID, optionally (defaults to the currently logged in user)
* @return true|false
*/
function canEditMetadata($metadata = null, $user_guid = 0) {
return can_edit_entity_metadata($this->getGUID(), $user_guid, $metadata);
}
/**
* Returns whether the given user (or current user) has the ability to write to this group.
*
* @param int $user_guid The user.
* @return bool
*/
public function canWriteToContainer($user_guid = 0)
{
return can_write_to_container($user_guid, $this->getGUID());
}
/**
* Obtain this entity's access ID
*
* @return int The access ID
*/
public function getAccessID() { return $this->get('access_id'); }
/**
* Obtain this entity's GUID
*
* @return int GUID
*/
public function getGUID() { return $this->get('guid'); }
/**
* Get the owner of this entity
*
* @return int The owner GUID
*/
public function getOwner() { return $this->get('owner_guid'); }
/**
* Returns the actual entity of the user who owns this entity, if any
*
* @return ElggEntity The owning user
*/
public function getOwnerEntity() { return get_entity($this->get('owner_guid')); }
/**
* Gets the type of entity this is
*
* @return string Entity type
*/
public function getType() { return $this->get('type'); }
/**
* Returns the subtype of this entity
*
* @return string The entity subtype
*/
public function getSubtype() {
if (!((int) $this->guid > 0)) return $this->get('subtype'); // If this object hasn't been saved, then return the subtype string.
return get_subtype_from_id($this->get('subtype'));
}
/**
* Gets the UNIX epoch time that this entity was created
*
* @return int UNIX epoch time
*/
public function getTimeCreated() { return $this->get('time_created'); }
/**
* Gets the UNIX epoch time that this entity was last updated
*
* @return int UNIX epoch time
*/
public function getTimeUpdated() { return $this->get('time_updated'); }
/**
* Gets the display URL for this entity
*
* @return string The URL
*/
public function getURL() {
if (!empty($this->url_override)) return $this->url_override;
return get_entity_url($this->getGUID());
}
/**
* Overrides the URL returned by getURL
*
* @param string $url The new item URL
* @return string The URL
*/
public function setURL($url) {
$this->url_override = $url;
return $url;
}
/**
* Return a url for the entity's icon, trying multiple alternatives.
*
* @param string $size Either 'large','medium','small' or 'tiny'
* @return string The url or false if no url could be worked out.
*/
public function getIcon($size = 'medium')
{
if (isset($this->icon_override[$size])) return $this->icon_override[$size];
return elgg_get_entity_icon_url($this, $size);
}
/**
* Set an icon override for an icon and size.
*
* @param string $url The url of the icon.
* @param string $size The size its for.
* @return bool
*/
public function setIcon($url, $size = 'medium')
{
$url = sanitise_string($url);
$size = sanitise_string($size);
if (!$this->icon_override) $this->icon_override = array();
$this->icon_override[$size] = $url;
return true;
}
/**
* Tests to see whether the object has been fully loaded.
*
* @return bool
*/
public function isFullyLoaded() { return ! ($this->attributes['tables_loaded'] < $this->attributes['tables_split']); }
/**
* Save generic attributes to the entities table.
*/
public function save()
{
$guid = (int) $this->guid;
if ($guid > 0)
{
cache_entity($this);
return update_entity(
$this->get('guid'),
$this->get('owner_guid'),
$this->get('access_id')
);
}
else
{
$this->attributes['guid'] = create_entity($this->attributes['type'], $this->attributes['subtype'], $this->attributes['owner_guid'], $this->attributes['access_id'], $this->attributes['site_guid'], $this->attributes['container_guid']); // Create a new entity (nb: using attribute array directly 'cos set function does something special!)
if (!$this->attributes['guid']) throw new IOException(elgg_echo('IOException:BaseEntitySaveFailed'));
// Save any unsaved metadata TODO: How to capture extra information (access id etc)
if (sizeof($this->temp_metadata) > 0) {
foreach($this->temp_metadata as $name => $value) {
$this->$name = $value;
unset($this->temp_metadata[$name]);
}
}
// Save any unsaved annotations metadata. TODO: How to capture extra information (access id etc)
if (sizeof($this->temp_annotations) > 0) {
foreach($this->temp_annotations as $name => $value) {
$this->annotate($name, $value);
unset($this->temp_annotations[$name]);
}
}
// Cache object handle
if ($this->attributes['guid']) cache_entity($this);
return $this->attributes['guid'];
}
}
/**
* Load the basic entity information and populate base attributes array.
*
* @param int $guid
*/
protected function load($guid)
{
$row = get_entity_as_row($guid);
if ($row)
{
// Create the array if necessary - all subclasses should test before creating
if (!is_array($this->attributes)) $this->attributes = array();
// Now put these into the attributes array as core values
$objarray = (array) $row;
foreach($objarray as $key => $value)
$this->attributes[$key] = $value;
// Increment the portion counter
if (!$this->isFullyLoaded()) $this->attributes['tables_loaded'] ++;
// Cache object handle
if ($this->attributes['guid']) cache_entity($this);
return true;
}
return false;
}
/**
* Disable this entity.
*/
public function disable()
{
return disable_entity($this->get('guid'));
}
/**
* Delete this entity.
*/
public function delete()
{
$res = delete_entity($this->get('guid'));
return $res;
}
// EXPORTABLE INTERFACE ////////////////////////////////////////////////////////////
/**
* Export this class into a stdClass containing all necessary fields.
* Override if you wish to return more information than can be found in $this->attributes (shouldn't happen)
*
* @return stdClass
*/
public function export()
{
$tmp = array();
// Generate uuid
$uuid = guid_to_uuid($this->getGUID());
// Create entity
$odd = new ODDEntity(
$uuid,
$this->attributes['type'],
get_subtype_from_id($this->attributes['subtype'])
);
$tmp[] = $odd;
// Now add its attributes
foreach ($this->attributes as $k => $v)
{
$meta = NULL;
switch ($k)
{
case 'guid' : // Dont use guid
case 'subtype' : // The subtype
case 'type' : // Don't use type
case 'access_id' : // Don't use access - if can export then its public for you, then importer decides what access to give this object.
case 'time_updated' : // Don't use date in export
case 'tables_split' : // We don't want to export the internal counter variables.
case 'tables_loaded' : // Or this one
case 'enabled' : // Useless to an importer
case 'email' :
case 'password' : // Definitely don't want these two
break;
case 'time_created' : // Created = published
$odd->setAttribute('published', date("r", $v));
break;
case 'site_guid' : // Container
$k = 'site_uuid';
$v = guid_to_uuid($v);
$meta = new ODDMetaData($uuid . "attr/$k/", $uuid, $k, $v);
break;
case 'container_guid' : // Container
$k = 'container_uuid';
$v = guid_to_uuid($v);
$meta = new ODDMetaData($uuid . "attr/$k/", $uuid, $k, $v);
break;
case 'owner_guid' : // Convert owner guid to uuid, this will be stored in metadata
$k = 'owner_uuid';
$v = guid_to_uuid($v);
$meta = new ODDMetaData($uuid . "attr/$k/", $uuid, $k, $v);
break;
default :
$meta = new ODDMetaData($uuid . "attr/$k/", $uuid, $k, $v);
}
// set the time of any metadata created
if ($meta)
{
$meta->setAttribute('published', date("r",$this->time_created));
$tmp[] = $meta;
}
}
// Now we do something a bit special.
/*
* This provides a rendered view of the entity to foreign sites.
*/
elgg_set_viewtype('default');
$view = elgg_view_entity($this, true);
elgg_set_viewtype();
$tmp[] = new ODDMetaData($uuid . "volatile/renderedentity/", $uuid, 'renderedentity', $view , 'volatile');
return $tmp;
}
// IMPORTABLE INTERFACE ////////////////////////////////////////////////////////////
/**
* Import data from an parsed xml data array.
*
* @param array $data
* @param int $version
*/
public function import(ODD $data)
{
if (!($data instanceof ODDEntity))
throw new InvalidParameterException(elgg_echo('InvalidParameterException:UnexpectedODDClass'));
// Set type and subtype
$this->attributes['type'] = $data->getAttribute('class');
$this->attributes['subtype'] = $data->getAttribute('subclass');
// Set owner
$this->attributes['owner_guid'] = $_SESSION['id']; // Import as belonging to importer.
// Set time
$this->attributes['time_created'] = strtotime($data->getAttribute('published'));
$this->attributes['time_updated'] = time();
return true;
}
// SYSTEM LOG INTERFACE ////////////////////////////////////////////////////////////
/**
* Return an identification for the object for storage in the system log.
* This id must be an integer.
*
* @return int
*/
public function getSystemLogID() { return $this->getGUID(); }
/**
* Return the class name of the object.
*/
public function getClassName() { return get_class($this); }
/**
* For a given ID, return the object associated with it.
* This is used by the river functionality primarily.
* This is useful for checking access permissions etc on objects.
*/
public function getObjectFromID($id) { return get_entity($id); }
/**
* Return the GUID of the owner of this object.
*/
public function getObjectOwnerGUID() { return $this->owner_guid; }
// ITERATOR INTERFACE //////////////////////////////////////////////////////////////
/*
* This lets an entity's attributes be displayed using foreach as a normal array.
* Example: http://www.sitepoint.com/print/php5-standard-library
*/
private $valid = FALSE;
function rewind()
{
$this->valid = (FALSE !== reset($this->attributes));
}
function current()
{
return current($this->attributes);
}
function key()
{
return key($this->attributes);
}
function next()
{
$this->valid = (FALSE !== next($this->attributes));
}
function valid()
{
return $this->valid;
}
// ARRAY ACCESS INTERFACE //////////////////////////////////////////////////////////
/*
* This lets an entity's attributes be accessed like an associative array.
* Example: http://www.sitepoint.com/print/php5-standard-library
*/
function offsetSet($key, $value)
{
if ( array_key_exists($key, $this->attributes) ) {
$this->attributes[$key] = $value;
}
}
function offsetGet($key)
{
if ( array_key_exists($key, $this->attributes) ) {
return $this->attributes[$key];
}
}
function offsetUnset($key)
{
if ( array_key_exists($key, $this->attributes) ) {
$this->attributes[$key] = ""; // Full unsetting is dangerious for our objects
}
}
function offsetExists($offset)
{
return array_key_exists($offset, $this->attributes);
}
}
/**
* Initialise the entity cache.
*/
function initialise_entity_cache()
{
global $ENTITY_CACHE;
if (!is_array($ENTITY_CACHE))
$ENTITY_CACHE = array();
}
/**
* Invalidate this class' entry in the cache.
*
* @param int $guid The guid
*/
function invalidate_cache_for_entity($guid)
{
global $ENTITY_CACHE;
$guid = (int)$guid;
unset($ENTITY_CACHE[$guid]);
}
/**
* Cache an entity.
*
* @param ElggEntity $entity Entity to cache
*/
function cache_entity(ElggEntity $entity)
{
global $ENTITY_CACHE;
$ENTITY_CACHE[$entity->guid] = $entity;
}
/**
* Retrieve a entity from the cache.
*
* @param int $guid The guid
*/
function retrieve_cached_entity($guid)
{
global $ENTITY_CACHE;
$guid = (int)$guid;
if (isset($ENTITY_CACHE[$guid]))
if ($ENTITY_CACHE[$guid]->isFullyLoaded()) return $ENTITY_CACHE[$guid];
return false;
}
/**
* As retrieve_cached_entity, but returns the result as a stdClass (compatible with load functions that
* expect a database row.)
*
* @param int $guid The guid
*/
function retrieve_cached_entity_row($guid)
{
$obj = retrieve_cached_entity($guid);
if ($obj)
{
$tmp = new stdClass;
foreach ($obj as $k => $v)
$tmp->$k = $v;
return $tmp;
}
return false;
}
/**
* Return the integer ID for a given subtype, or false.
*
* TODO: Move to a nicer place?
*
* @param string $type
* @param string $subtype
*/
function get_subtype_id($type, $subtype)
{
global $CONFIG, $SUBTYPE_CACHE;
$type = sanitise_string($type);
$subtype = sanitise_string($subtype);
if ($subtype=="") return $subtype;
// Todo: cache here? Or is looping less efficient that going to the db each time?
$result = get_data_row("SELECT * from {$CONFIG->dbprefix}entity_subtypes where type='$type' and subtype='$subtype'");
if ($result) {
$SUBTYPE_CACHE[$result->id] = $result;
return $result->id;
}
return 0;
}
/**
* For a given subtype ID, return its identifier text.
*
* TODO: Move to a nicer place?
*
* @param int $subtype_id
*/
function get_subtype_from_id($subtype_id)
{
global $CONFIG, $SUBTYPE_CACHE;
$subtype_id = (int)$subtype_id;
if (!$subtype_id) return false;
if (isset($SUBTYPE_CACHE[$subtype_id]))
return $SUBTYPE_CACHE[$subtype_id]->subtype;
$result = get_data_row("SELECT * from {$CONFIG->dbprefix}entity_subtypes where id=$subtype_id");
if ($result) {
$SUBTYPE_CACHE[$subtype_id] = $result;
return $result->subtype;
}
return false;
}
/**
* This function tests to see if a subtype has a registered class handler.
*
* @param string $type The type
* @param string $subtype The subtype
* @return a class name or null
*/
function get_subtype_class($type, $subtype)
{
global $CONFIG, $SUBTYPE_CACHE;
$type = sanitise_string($type);
$subtype = sanitise_string($subtype);
// Todo: cache here? Or is looping less efficient that going to the db each time?
$result = get_data_row("SELECT * from {$CONFIG->dbprefix}entity_subtypes where type='$type' and subtype='$subtype'");
if ($result) {
$SUBTYPE_CACHE[$result->id] = $result;
return $result->class;
}
return NULL;
}
/**
* This function tests to see if a subtype has a registered class handler by its id.
*
* @param int $subtype_id The subtype
* @return a class name or null
*/
function get_subtype_class_from_id($subtype_id)
{
global $CONFIG, $SUBTYPE_CACHE;
$subtype_id = (int)$subtype_id;
if (!$subtype_id) return false;
if (isset($SUBTYPE_CACHE[$subtype_id]))
return $SUBTYPE_CACHE[$subtype_id]->class;
$result = get_data_row("SELECT * from {$CONFIG->dbprefix}entity_subtypes where id=$subtype_id");
if ($result) {
$SUBTYPE_CACHE[$subtype_id] = $result;
return $result->class;
}
return NULL;
}
/**
* This function will register a new subtype, returning its ID as required.
*
* @param string $type The type you're subtyping
* @param string $subtype The subtype label
* @param string $class Optional class handler (if you don't want it handled by the generic elgg handler for the type)
*/
function add_subtype($type, $subtype, $class = "")
{
global $CONFIG;
$type = sanitise_string($type);
$subtype = sanitise_string($subtype);
$class = sanitise_string($class);
// Short circuit if no subtype is given
if ($subtype == "")
return 0;
$id = get_subtype_id($type, $subtype);
if ($id==0)
return insert_data("insert into {$CONFIG->dbprefix}entity_subtypes (type, subtype, class) values ('$type','$subtype','$class')");
return $id;
}
/**
* Update an existing entity.
*
* @param int $guid
* @param int $owner_guid
* @param int $access_id
*/
function update_entity($guid, $owner_guid, $access_id)
{
global $CONFIG, $ENTITY_CACHE;
$guid = (int)$guid;
$owner_guid = (int)$owner_guid;
$access_id = (int)$access_id;
$time = time();
$entity = get_entity($guid);
if ($entity->canEdit()) {
if (trigger_elgg_event('update',$entity->type,$entity)) {
$ret = update_data("UPDATE {$CONFIG->dbprefix}entities set owner_guid='$owner_guid', access_id='$access_id', time_updated='$time' WHERE guid=$guid");
// Handle cases where there was no error BUT no rows were updated!
if ($ret===false)
return false;
return true;
}
}
}
/**
* Determine whether a given user is able to write to a given container.
*
* @param int $user_guid The user guid, or 0 for $_SESSION['user']->getGUID()
* @param int $container_guid The container, or 0 for the current page owner.
*/
function can_write_to_container($user_guid = 0, $container_guid = 0, $entity_type = 'all')
{
global $CONFIG;
$user_guid = (int)$user_guid;
if (!$user_guid) $user_guid = (int) $_SESSION['guid'];
$user = get_entity($user_guid);
$container_guid = (int)$container_guid;
if (!$container_guid) $container_guid = page_owner();
if (!$container_guid) return true;
$container = get_entity($container_guid);
if (($container) && ($user))
{
// If the user can edit the container, they can also write to it
if ($container->canEdit()) return true;
// Basics, see if the user is a member of the group.
if ($container instanceof ElggGroup)
if (!$container->isMember($user)) return false;
// See if anyone else has anything to say
return trigger_plugin_hook('container_permissions_check',$entity_type,array('container' => $container, 'user' => $user), false);
}
return false;
}
/**
* Create a new entity of a given type.
*
* @param string $type The type of the entity (site, user, object).
* @param string $subtype The subtype of the entity.
* @param int $owner_guid The GUID of the object's owner.
* @param int $access_id The access control group to create the entity with.
* @param int $site_guid The site to add this entity to. Leave as 0 (default) for the current site.
* @return mixed The new entity's GUID, or false on failure
*/
function create_entity($type, $subtype, $owner_guid, $access_id, $site_guid = 0, $container_guid = 0)
{
global $CONFIG;
$type = sanitise_string($type);
$subtype = add_subtype($type, $subtype);
$owner_guid = (int)$owner_guid;
$access_id = (int)$access_id;
$time = time();
if ($site_guid == 0)
$site_guid = $CONFIG->site_guid;
$site_guid = (int) $site_guid;
if ($container_guid == 0) $container_guid = $owner_guid;
if (!can_write_to_container($owner_guid, $container_guid, $type)) return false;
if ($type=="") throw new InvalidParameterException(elgg_echo('InvalidParameterException:EntityTypeNotSet'));
return insert_data("INSERT into {$CONFIG->dbprefix}entities (type, subtype, owner_guid, site_guid, container_guid, access_id, time_created, time_updated) values ('$type',$subtype, $owner_guid, $site_guid, $container_guid, $access_id, $time, $time)");
}
/**
* Retrieve the entity details for a specific GUID, returning it as a stdClass db row.
*
* You will only get an object if a) it exists, b) you have access to it.
*
* @param int $guid The GUID of the object to extract
*/
function get_entity_as_row($guid)
{
global $CONFIG;
$guid = (int) $guid;
$row = retrieve_cached_entity_row($guid);
if ($row)
{
// We have already cached this object, so retrieve its value from the cache
if (isset($CONFIG->debug) && $CONFIG->debug)
error_log("** Retrieving GUID:$guid from cache");
return $row;
}
else
{
// Object not cached, load it.
if (isset($CONFIG->debug) && $CONFIG->debug == true)
error_log("** GUID:$guid loaded from DB");
$access = get_access_sql_suffix();
return get_data_row("SELECT * from {$CONFIG->dbprefix}entities where guid=$guid and $access");
}
}
/**
* Create an Elgg* object from a given entity row.
*/
function entity_row_to_elggstar($row)
{
if (!($row instanceof stdClass))
return $row;
// See if there are any registered subtype handler classes for this type and subtype
$classname = get_subtype_class_from_id($row->subtype);
if ($classname!="")
{
if (class_exists($classname))
{
$tmp = new $classname($row);
if (!($tmp instanceof ElggEntity))
throw new ClassException(sprintf(elgg_echo('ClassException:ClassnameNotClass'), $classname, get_class()));
return $tmp;
}
else
error_log(sprintf(elgg_echo('ClassNotFoundException:MissingClass'), $classname));
}
else
{
switch ($row->type)
{
case 'object' :
return new ElggObject($row);
case 'user' :
return new ElggUser($row);
case 'group' :
return new ElggGroup($row);
case 'site' :
return new ElggSite($row);
default: throw new InstallationException(sprintf(elgg_echo('InstallationException:TypeNotSupported'), $row->type));
}
}
return false;
}
/**
* Return the entity for a given guid as the correct object.
* @param int $guid The GUID of the entity
* @return a child of ElggEntity appropriate for the type.
*/
function get_entity($guid)
{
return entity_row_to_elggstar(get_entity_as_row($guid));
}
/**
* Return entities matching a given query, or the number thereof
*
* @param string $type The type of entity (eg "user", "object" etc)
* @param string $subtype The arbitrary subtype of the entity
* @param int $owner_guid The GUID of the owning user
* @param string $order_by The field to order by; by default, time_created desc
* @param int $limit The number of entities to return; 10 by default
* @param int $offset The indexing offset, 0 by default
* @param boolean $count Set to true to get a count rather than the entities themselves (limits and offsets don't apply in this context). Defaults to false.
* @param int $site_guid The site to get entities for. Leave as 0 (default) for the current site; -1 for all sites.
* @param int|array $container_guid The container or containers to get entities from (default: all containers).
* @return array A list of entities.
*/
function get_entities($type = "", $subtype = "", $owner_guid = 0, $order_by = "", $limit = 10, $offset = 0, $count = false, $site_guid = 0, $container_guid = null)
{
global $CONFIG;
if ($subtype === false || $subtype === null || $subtype === 0)
return false;
$type = sanitise_string($type);
$subtype = get_subtype_id($type, $subtype);
if ($order_by == "") $order_by = "time_created desc";
$order_by = sanitise_string($order_by);
$limit = (int)$limit;
$offset = (int)$offset;
$site_guid = (int) $site_guid;
if ($site_guid == 0)
$site_guid = $CONFIG->site_guid;
$where = array();
if ($type != "")
$where[] = "type='$type'";
if ($subtype!=="")
$where[] = "subtype=$subtype";
if ($owner_guid != "") {
if (!is_array($owner_guid)) {
$owner_array = array($owner_guid);
$owner_guid = (int) $owner_guid;
// $where[] = "owner_guid = '$owner_guid'";
} else if (sizeof($owner_guid) > 0) {
$owner_array = array_map('sanitise_int', $owner_guid);
// Cast every element to the owner_guid array to int
// $owner_guid = array_map("sanitise_int", $owner_guid);
// $owner_guid = implode(",",$owner_guid);
// $where[] = "owner_guid in ({$owner_guid})";
}
if (is_null($container_guid)) {
$container_guid = $owner_array;
}
}
if ($site_guid > 0)
$where[] = "site_guid = {$site_guid}";
if (!is_null($container_guid)) {
if (is_array($container_guid)) {
foreach($container_guid as $key => $val) $container_guid[$key] = (int) $val;
$where[] = "container_guid in (" . implode(",",$container_guid) . ")";
} else {
$container_guid = (int) $container_guid;
$where[] = "container_guid = {$container_guid}";
}
}
if (!$count) {
$query = "SELECT * from {$CONFIG->dbprefix}entities where ";
} else {
$query = "select count(guid) as total from {$CONFIG->dbprefix}entities where ";
}
foreach ($where as $w)
$query .= " $w and ";
$query .= get_access_sql_suffix(); // Add access controls
if (!$count) {
$query .= " order by $order_by";
if ($limit) $query .= " limit $offset, $limit"; // Add order and limit
$dt = get_data($query, "entity_row_to_elggstar");
return $dt;
} else {
$total = get_data_row($query);
return $total->total;
}
}
/**
* Returns a viewable list of entities
*
* @see elgg_view_entity_list
*
* @param string $type The type of entity (eg "user", "object" etc)
* @param string $subtype The arbitrary subtype of the entity
* @param int $owner_guid The GUID of the owning user
* @param int $limit The number of entities to display per page (default: 10)
* @param true|false $fullview Whether or not to display the full view (default: true)
* @return string A viewable list of entities
*/
function list_entities($type= "", $subtype = "", $owner_guid = 0, $limit = 10, $fullview = true) {
$offset = (int) get_input('offset');
$count = get_entities($type, $subtype, $owner_guid, "", $limit, $offset, true);
$entities = get_entities($type, $subtype, $owner_guid, "", $limit, $offset);
return elgg_view_entity_list($entities, $count, $offset, $limit, $fullview);
}
/**
* Returns a viewable list of entities contained in a number of groups.
*
* @param string $subtype The arbitrary subtype of the entity
* @param int $owner_guid The GUID of the owning user
* @param int $container_guid The GUID of the containing group
* @param int $limit The number of entities to display per page (default: 10)
* @param true|false $fullview Whether or not to display the full view (default: true)
* @return string A viewable list of entities
*/
function list_entities_groups($subtype = "", $owner_guid = 0, $container_guid = 0, $limit = 10, $fullview = true)
{
$offset = (int) get_input('offset');
$count = get_objects_in_group($container_guid, $subtype, $owner_guid, 0, "", $limit, $offset, true);
$entities = get_objects_in_group($container_guid, $subtype, $owner_guid, 0, "", $limit, $offset);
return elgg_view_entity_list($entities, $count, $offset, $limit, $fullview);
}
/**
* Disable an entity but not delete it.
*
* @param int $guid
*/
function disable_entity($guid)
{
global $CONFIG;
$guid = (int)$guid;
if ($entity = get_entity($guid)) {
if (trigger_elgg_event('delete',$entity->type,$entity)) {
if ($entity->canEdit()) {
$res = update_data("UPDATE {$CONFIG->dbprefix}entities set enabled='no' where guid={$guid}");
return $res;
}
}
}
return false;
}
/**
* Delete a given entity.
*
* @param int $guid
*/
function delete_entity($guid)
{
global $CONFIG;
// TODO Make sure this deletes all metadata/annotations/relationships/etc!!
$guid = (int)$guid;
if ($entity = get_entity($guid)) {
if (trigger_elgg_event('delete',$entity->type,$entity)) {
if ($entity->canEdit()) {
$entity->clearMetadata();
$entity->clearAnnotations();
$entity->clearRelationships();
$res = delete_data("DELETE from {$CONFIG->dbprefix}entities where guid={$guid}");
return $res;
}
}
}
return false;
}
/**
* Delete multiple entities that match a given query.
* This function itterates through and calls delete_entity on each one, this is somewhat inefficient but lets
* the 'delete' even be called for each entity.
*
* @param string $type The type of entity (eg "user", "object" etc)
* @param string $subtype The arbitrary subtype of the entity
* @param int $owner_guid The GUID of the owning user
*/
function delete_entities($type = "", $subtype = "", $owner_guid = 0)
{
$entities = get_entities($type, $subtype, $owner_guid, "time_created desc", 0);
foreach ($entities as $entity)
delete_entity($entity->guid);
return true;
}
/**
* A plugin hook to get certain volitile (generated on the fly) attributes about an entity in order to export them.
*
* @param unknown_type $hook
* @param unknown_type $entity_type
* @param unknown_type $returnvalue
* @param unknown_type $params The parameters, passed 'guid' and 'varname'
* @return unknown
*/
function volatile_data_export_plugin_hook($hook, $entity_type, $returnvalue, $params)
{
$guid = (int)$params['guid'];
$variable_name = sanitise_string($params['varname']);
if (($hook == 'volatile') && ($entity_type == 'metadata'))
{
if (($guid) && ($variable_name))
{
switch ($variable_name)
{
case 'renderedentity' :
elgg_set_viewtype('default');
$view = elgg_view_entity(get_entity($guid));
elgg_set_viewtype();
$tmp = new ElggMetadata();
$tmp->type = 'volatile';
$tmp->name = 'renderedentity';
$tmp->value = $view;
$tmp->entity_guid = $guid;
return $tmp;
break;
}
}
}
}
/**
* Handler called by trigger_plugin_hook on the "export" event.
*/
function export_entity_plugin_hook($hook, $entity_type, $returnvalue, $params)
{
// Sanity check values
if ((!is_array($params)) && (!isset($params['guid'])))
throw new InvalidParameterException(elgg_echo('InvalidParameterException:GUIDNotForExport'));
if (!is_array($returnvalue))
throw new InvalidParameterException(elgg_echo('InvalidParameterException:NonArrayReturnValue'));
$guid = (int)$params['guid'];
// Get the entity
$entity = get_entity($guid);
if (!($entity instanceof ElggEntity))
throw new InvalidClassException(sprintf(elgg_echo('InvalidClassException:NotValidElggStar'), $guid, get_class()));
$export = $entity->export();
if (is_array($export))
foreach ($export as $e)
$returnvalue[] = $e;
else
$returnvalue[] = $export;
return $returnvalue;
}
/**
* Utility function used by import_entity_plugin_hook() to process an ODDEntity into an unsaved ElggEntity.
*
* @param ODDEntity $element The OpenDD element
* @return ElggEntity the unsaved entity which should be populated by items.
*/
function oddentity_to_elggentity(ODDEntity $element)
{
$class = $element->getAttribute('class');
$subclass = $element->getAttribute('subclass');
// See if we already have imported this uuid
$tmp = get_entity_from_uuid($element->getAttribute('uuid'));
if (!$tmp)
{
// Construct new class with owner from session
$classname = get_subtype_class($class, $subclass);
if ($classname!="")
{
if (class_exists($classname))
{
$tmp = new $classname();
if (!($tmp instanceof ElggEntity))
throw new ClassException(sprintf(elgg_echo('ClassException:ClassnameNotClass', $classname, get_class())));
}
else
error_log(sprintf(elgg_echo('ClassNotFoundException:MissingClass'), $classname));
}
else
{
switch ($class)
{
case 'object' : $tmp = new ElggObject($row); break;
case 'user' : $tmp = new ElggUser($row); break;
case 'group' : $tmp = new ElggGroup($row); break;
case 'site' : $tmp = new ElggSite($row); break;
default: throw new InstallationException(sprintf(elgg_echo('InstallationException:TypeNotSupported'), $class));
}
}
}
if ($tmp)
{
if (!$tmp->import($element))
throw new ImportException(sprintf(elgg_echo('ImportException:ImportFailed'), $element->getAttribute('uuid')));
return $tmp;
}
return NULL;
}
/**
* Import an entity.
* This function checks the passed XML doc (as array) to see if it is a user, if so it constructs a new
* elgg user and returns "true" to inform the importer that it's been handled.
*/
function import_entity_plugin_hook($hook, $entity_type, $returnvalue, $params)
{
$element = $params['element'];
$tmp = NULL;
if ($element instanceof ODDEntity)
{
$tmp = oddentity_to_elggentity($element);
if ($tmp)
{
if (!$tmp->save()) // Make sure its saved
throw new ImportException(sprintf(elgg_echo('ImportException:ProblemSaving'), $element->getAttribute('uuid')));
// Belts and braces
if (!$tmp->guid)
throw new ImportException(elgg_echo('ImportException:NoGUID'));
add_uuid_to_guid($tmp->guid, $element->getAttribute('uuid')); // We have saved, so now tag
return $tmp;
}
}
}
/**
* Determines whether or not the specified user can edit the specified entity.
*
* This is extendible by registering a plugin hook taking in the parameters 'entity' and 'user',
* which are the entity and user entities respectively
*
* @see register_plugin_hook
*
* @param int $entity_guid The GUID of the entity
* @param int $user_guid The GUID of the user
* @return true|false Whether the specified user can edit the specified entity.
*/
function can_edit_entity($entity_guid, $user_guid = 0) {
global $CONFIG;
if ($user_guid == 0) {
if (isset($_SESSION['user'])) {
$user = $_SESSION['user'];
} else {
$user = null;
}
} else {
$user = get_entity($user_guid);
}
if ($entity = get_entity($entity_guid)) {
// Test user if possible - should default to false unless a plugin hook says otherwise
if (!is_null($user))
{
if ($entity->getOwner() == $user->getGUID()) return true;
if ($entity->type == "user" && $entity->getGUID() == $user->getGUID()) return true;
}
return trigger_plugin_hook('permissions_check',$entity->type,array('entity' => $entity, 'user' => $user),false);
} else {
return false;
}
}
/**
* Determines whether or not the specified user can edit metadata on the specified entity.
*
* This is extendible by registering a plugin hook taking in the parameters 'entity' and 'user',
* which are the entity and user entities respectively
*
* @see register_plugin_hook
*
* @param int $entity_guid The GUID of the entity
* @param int $user_guid The GUID of the user
* @param ElggMetadata $metadata The metadata to specifically check (if any; default null)
* @return true|false Whether the specified user can edit the specified entity.
*/
function can_edit_entity_metadata($entity_guid, $user_guid = 0, $metadata = null) {
if ($entity = get_entity($entity_guid)) {
$return = null;
if ($metadata->owner_guid == 0) $return = true;
if (is_null($return))
$return = can_edit_entity($entity_guid, $user_guid);
$user = get_entity($user_guid);
$return = trigger_plugin_hook('permissions_check:metadata',$entity->type,array('entity' => $entity, 'user' => $user, 'metadata' => $metadata),$return);
return $return;
} else {
return false;
}
}
/**
* Gets the URL for an entity, given a particular GUID
*
* @param int $entity_guid The GUID of the entity
* @return string The URL of the entity
*/
function get_entity_url($entity_guid) {
global $CONFIG;
if ($entity = get_entity($entity_guid)) {
$url = "";
if (isset($CONFIG->entity_url_handler[$entity->getType()][$entity->getSubType()])) {
$function = $CONFIG->entity_url_handler[$entity->getType()][$entity->getSubType()];
if (is_callable($function)) {
$url = $function($entity);
}
}
if (isset($CONFIG->entity_url_handler[$entity->getType()]['all'])) {
$function = $CONFIG->entity_url_handler[$entity->getType()]['all'];
if (is_callable($function)) {
$url = $function($entity);
}
}
if (isset($CONFIG->entity_url_handler['all']['all'])) {
$function = $CONFIG->entity_url_handler['all']['all'];
if (is_callable($function)) {
$url = $function($entity);
}
}
if ($url == "") {
$url = $CONFIG->url . "pg/view/" . $entity_guid;
}
return $url;
}
return false;
}
/**
* Sets the URL handler for a particular entity type and subtype
*
* @param string $function_name The function to register
* @param string $entity_type The entity type
* @param string $entity_subtype The entity subtype
* @return true|false Depending on success
*/
function register_entity_url_handler($function_name, $entity_type = "all", $entity_subtype = "all") {
global $CONFIG;
if (!is_callable($function_name)) return false;
if (!isset($CONFIG->entity_url_handler)) {
$CONFIG->entity_url_handler = array();
}
if (!isset($CONFIG->entity_url_handler[$entity_type])) {
$CONFIG->entity_url_handler[$entity_type] = array();
}
$CONFIG->entity_url_handler[$entity_type][$entity_subtype] = $function_name;
return true;
}
/**
* Page handler for generic entities view system
*
* @param array $page Page elements from pain page handler
*/
function entities_page_handler($page) {
if (isset($page[0])) {
global $CONFIG;
set_input('guid',$page[0]);
@include($CONFIG->path . "entities/index.php");
}
}
/**
* Entities init function; establishes the page handler
*
*/
function entities_init() {
register_page_handler('view','entities_page_handler');
}
/** Register the import hook */
register_plugin_hook("import", "all", "import_entity_plugin_hook", 0);
/** Register the hook, ensuring entities are serialised first */
register_plugin_hook("export", "all", "export_entity_plugin_hook", 0);
/** Hook to get certain named bits of volatile data about an entity */
register_plugin_hook('volatile', 'metadata', 'volatile_data_export_plugin_hook');
/** Register init system event **/
register_elgg_event_handler('init','system','entities_init');
?>
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