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|
<?php
/**
* Elgg metadata
* Functions to manage object metadata.
*
* @package Elgg
* @subpackage Core
* @author Curverider Ltd <info@elgg.com>
* @link http://elgg.org/
*/
/**
* ElggMetadata
* This class describes metadata that can be attached to ElggEntities.
*
* @author Curverider Ltd <info@elgg.com>
* @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)) {
// Create from db row
if ($id instanceof stdClass) {
$metadata = $id;
} 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, $value);
}
/**
* Determines whether or not the user can edit this piece of metadata
*
* @return true|false Depending on permissions
*/
function canEdit() {
if ($entity = get_entity($this->get('entity_guid'))) {
return $entity->canEditMetadata($this);
}
return false;
}
/**
* 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(sprintf(elgg_new('IOException:UnableToSaveNew'), get_class()));
}
return $this->id;
}
}
/**
* Delete a given metadata.
*/
function delete() {
return delete_metadata($this->id);
}
/**
* Get a url for this item of metadata.
*
* @return string
*/
public function getURL() {
return get_metadata_url($this->id);
}
// SYSTEM LOG INTERFACE ////////////////////////////////////////////////////////////
/**
* For a given ID, return the object associated with it.
* This is used by the river functionality primarily.
* This is useful for checking access permissions etc on objects.
*/
public function getObjectFromID($id) {
return get_metadata($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);
}
/**
* 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_sql_suffix("e");
$md_access = get_access_sql_suffix("m");
return row_to_elggmetadata(get_data_row("SELECT m.*, n.string as name, v.string as value from {$CONFIG->dbprefix}metadata m JOIN {$CONFIG->dbprefix}entities e on e.guid = m.entity_guid JOIN {$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 $access and $md_access"));
}
/**
* Removes metadata on an entity with a particular name, optionally with a given value.
*
* @param int $entity_guid The entity GUID
* @param string $name The name of the metadata
* @param string $value The optional value of the item (useful for removing a single item in a multiple set)
* @return true|false Depending on success
*/
function remove_metadata($entity_guid, $name, $value = "") {
global $CONFIG;
$entity_guid = (int) $entity_guid;
$name = sanitise_string($name);
$value = sanitise_string($value);
$query = "SELECT * from {$CONFIG->dbprefix}metadata WHERE entity_guid = $entity_guid and name_id=" . add_metastring($name);
if ($value!="") {
$query .= " and value_id=" . add_metastring($value);
}
if ($existing = get_data($query)) {
foreach($existing as $ex) {
delete_metadata($ex->id);
}
return true;
}
return false;
}
/**
* Create a new metadata object, or update an existing one.
*
* @param int $entity_guid The entity to attach the metadata to
* @param string $name Name of the metadata
* @param string $value Value of the metadata (cannot be associative array)
* @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 = ACCESS_PRIVATE, $allow_multiple = false) {
global $CONFIG;
$entity_guid = (int)$entity_guid;
//$name = sanitise_string(trim($name));
//$value = sanitise_string(trim($value));
$value_type = detect_extender_valuetype($value, sanitise_string(trim($value_type)));
$time = time();
$owner_guid = (int)$owner_guid;
$allow_multiple = (boolean)$allow_multiple;
if ($owner_guid==0) {
$owner_guid = get_loggedin_userid();
}
$access_id = (int)$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) && (isset($value))) {
$id = $existing->id;
$result = update_metadata($id, $name, $value, $value_type, $owner_guid, $access_id);
if (!$result) {
return false;
}
}
else if (isset($value)) {
// Support boolean types
if (is_bool($value)) {
if ($value) {
$value = 1;
} else {
$value = 0;
}
}
// 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, $access_id)");
if ($id!==false) {
$obj = get_metadata($id);
if (trigger_elgg_event('create', 'metadata', $obj)) {
return true;
} else {
delete_metadata($id);
}
}
} else if ($existing) {
// TODO: Check... are you sure you meant to do this Ben? :)
$id = $existing->id;
delete_metadata($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;
if (!$md = get_metadata($id)) {
return false;
}
if (!$md->canEdit()) {
return false;
}
// If memcached then we invalidate the cache for this entry
static $metabyname_memcache;
if ((!$metabyname_memcache) && (is_memcache_available())) {
$metabyname_memcache = new ElggMemcache('metabyname_memcache');
}
if ($metabyname_memcache) {
$metabyname_memcache->delete("{$md->entity_guid}:{$md->name_id}");
}
//$name = sanitise_string(trim($name));
//$value = sanitise_string(trim($value));
$value_type = detect_extender_valuetype($value, sanitise_string(trim($value_type)));
$owner_guid = (int)$owner_guid;
if ($owner_guid==0) {
$owner_guid = get_loggedin_userid();
}
$access_id = (int)$access_id;
$access = get_access_sql_suffix();
// Support boolean types (as integers)
if (is_bool($value)) {
if ($value) {
$value = 1;
} else {
$value = 0;
}
}
// Add the metastring
$value = add_metastring($value);
if (!$value) {
return false;
}
$name = add_metastring($name);
if (!$name) {
return false;
}
// If ok then add it
$result = update_data("UPDATE {$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'");
if ($result!==false) {
$obj = get_metadata($id);
if (trigger_elgg_event('update', 'metadata', $obj)) {
return true;
} else {
delete_metadata($id);
}
}
return $result;
}
/**
* 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 = ACCESS_PRIVATE, $allow_multiple = false) {
foreach ($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) {
// Tidy up if memcache is enabled.
static $metabyname_memcache;
if ((!$metabyname_memcache) && (is_memcache_available())) {
$metabyname_memcache = new ElggMemcache('metabyname_memcache');
}
if ($metabyname_memcache) {
$metabyname_memcache->delete("{$metadata->entity_guid}:{$metadata->name_id}");
}
if (($metadata->canEdit()) && (trigger_elgg_event('delete', 'metadata', $metadata))) {
return delete_data("DELETE from {$CONFIG->dbprefix}metadata where id=$id");
}
}
return false;
}
/**
* 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);
if (empty($meta_name)) {
return false;
}
$entity_guid = (int)$entity_guid;
$access = get_access_sql_suffix("e");
$md_access = get_access_sql_suffix("m");
// If memcache is available then cache this (cache only by name for now since this is the most common query)
$meta = null;
static $metabyname_memcache;
if ((!$metabyname_memcache) && (is_memcache_available())) {
$metabyname_memcache = new ElggMemcache('metabyname_memcache');
}
if ($metabyname_memcache) {
$meta = $metabyname_memcache->load("{$entity_guid}:{$meta_name}");
}
if ($meta) {
return $meta;
}
$result = get_data("SELECT m.*, n.string as name, v.string as value from {$CONFIG->dbprefix}metadata m JOIN {$CONFIG->dbprefix}entities e ON e.guid = m.entity_guid JOIN {$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 $access and $md_access ORDER BY m.id ASC", "row_to_elggmetadata");
if (!$result) {
return false;
}
// Cache if memcache available
if ($metabyname_memcache) {
if (count($result) == 1) {
$r = $result[0];
} else {
$r = $result;
}
// This is a bit of a hack - we shorten the expiry on object
// metadata so that it'll be gone in an hour. This means that
// deletions and more importantly updates will filter through eventually.
$metabyname_memcache->setDefaultExpiry(3600);
$metabyname_memcache->save("{$entity_guid}:{$meta_name}", $r);
}
if (count($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_sql_suffix("e");
$md_access = get_access_sql_suffix("m");
return get_data("SELECT m.*, n.string as name, v.string as value from {$CONFIG->dbprefix}metadata m JOIN {$CONFIG->dbprefix}entities e ON e.guid = m.entity_guid JOIN {$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 $access and $md_access", "row_to_elggmetadata");
}
/**
* Get the metadata where the entities they are referring to match a given 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.
* @param int $site_guid The site to get entities for. Leave as 0 (default) for the current site; -1 for all sites.
*/
function find_metadata($meta_name = "", $meta_value = "", $entity_type = "", $entity_subtype = "", $limit = 10, $offset = 0, $order_by = "", $site_guid = 0) {
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;
if ($order_by == "") {
$order_by = "e.time_created desc";
}
$order_by = sanitise_string($order_by);
$site_guid = (int) $site_guid;
if ($site_guid == 0) {
$site_guid = $CONFIG->site_guid;
}
$where = array();
if ($entity_type!="") {
$where[] = "e.type='$entity_type'";
}
if ($entity_subtype) {
$where[] = "e.subtype=$entity_subtype";
}
if ($meta_name!="") {
if (!$meta_v) {
// The value is set, but we didn't get a value... so something went wrong.
return false;
}
$where[] = "m.name_id='$meta_n'";
}
if ($meta_value!="") {
// The value is set, but we didn't get a value... so something went wrong.
if (!$meta_v) {
return false;
}
$where[] = "m.value_id='$meta_v'";
}
if ($site_guid > 0) {
$where[] = "e.site_guid = {$site_guid}";
}
$query = "SELECT m.*, n.string as name, v.string as value from {$CONFIG->dbprefix}entities e JOIN {$CONFIG->dbprefix}metadata m on e.guid = m.entity_guid JOIN {$CONFIG->dbprefix}metastrings v on m.value_id = v.id JOIN {$CONFIG->dbprefix}metastrings n on m.name_id = n.id where";
foreach ($where as $w) {
$query .= " $w and ";
}
$query .= get_access_sql_suffix("e"); // Add access controls
$query .= ' and ' . get_access_sql_suffix("m"); // Add access controls
$query .= " order by $order_by limit $offset, $limit"; // Add order and limit
return get_data($query, "row_to_elggmetadata");
}
/**
* Returns entities based upon metadata. Also accepts all
* options available to elgg_get_entities(). Supports
* the singular option shortcut.
*
* NB: Using metadata_names and metadata_values results in a
* "names IN (...) AND values IN (...)" clause. This is subtly
* differently than default multiple metadata_name_value_pairs, which use
* "(name = value) AND (name = value)" clauses.
*
* When in doubt, use name_value_pairs.
*
* @see elgg_get_entities
* @see elgg_get_entities_from_annotations
* @param array $options Array in format:
*
* metadata_names => NULL|ARR metadata names
*
* metadata_values => NULL|ARR metadata values
*
* metadata_name_value_pairs => NULL|ARR (name => 'name', value => 'value', 'operand' => '=', 'case_sensitive' => TRUE) entries.
* Currently if multiple values are sent via an array (value => array('value1', 'value2') the pair's operand will be forced to "IN".
*
* metadata_name_value_pairs_operator => NULL|STR The operator to use for combining (name = value) OPERATOR (name = value); default AND
*
* metadata_case_sensitive => BOOL Overall Case sensitive
*
* order_by_metadata => NULL|ARR (array('name' => 'metadata_text1', 'direction' => ASC|DESC, 'as' => text|integer),
* Also supports array('name' => 'metadata_text1')
*
* metadata_owner_guids => NULL|ARR guids for metadata owners
*
* @return array
*/
function elgg_get_entities_from_metadata(array $options = array()) {
$defaults = array(
'metadata_names' => ELGG_ENTITIES_ANY_VALUE,
'metadata_values' => ELGG_ENTITIES_ANY_VALUE,
'metadata_name_value_pairs' => ELGG_ENTITIES_ANY_VALUE,
'metadata_name_value_pairs_operator'=> 'AND',
'metadata_case_sensitive' => TRUE,
'order_by_metadata' => array(),
'metadata_owner_guids' => ELGG_ENTITIES_ANY_VALUE,
);
$options = array_merge($defaults, $options);
$singulars = array('metadata_name', 'metadata_value', 'metadata_name_value_pair', 'metadata_owner_guid');
$options = elgg_normalise_plural_options_array($options, $singulars);
if (!$options = elgg_entities_get_metastrings_options('metadata', $options)) {
return FALSE;
}
return elgg_get_entities($options);
}
/**
* Returns options to pass to elgg_get_entities() for metastrings operations.
*
* @param string $type Metastring type: annotations or metadata
* @param array $options Options
*
* @return array
*/
function elgg_entities_get_metastrings_options($type, $options) {
$valid_types = array('metadata', 'annotation');
if (!in_array($type, $valid_types)) {
return FALSE;
}
// the options for annotations are singular (annotation_name) but the table
// is plural (elgg_annotations) so rewrite for the table name.
$n_table = ($type == 'annotation') ? 'annotations' : $type;
$singulars = array("{$type}_name", "{$type}_value", "{$type}_name_value_pair", "{$type}_owner_guid");
$options = elgg_normalise_plural_options_array($options, $singulars);
$clauses = elgg_get_entity_metadata_where_sql('e', $n_table, $options["{$type}_names"], $options["{$type}_values"],
$options["{$type}_name_value_pairs"], $options["{$type}_name_value_pairs_operator"], $options["{$type}_case_sensitive"],
$options["order_by_{$type}"], $options["{$type}_owner_guids"]);
if ($clauses) {
// merge wheres to pass to get_entities()
if (isset($options['wheres']) && !is_array($options['wheres'])) {
$options['wheres'] = array($options['wheres']);
} elseif (!isset($options['wheres'])) {
$options['wheres'] = array();
}
$options['wheres'] = array_merge($options['wheres'], $clauses['wheres']);
// merge joins to pass to get_entities()
if (isset($options['joins']) && !is_array($options['joins'])) {
$options['joins'] = array($options['joins']);
} elseif (!isset($options['joins'])) {
$options['joins'] = array();
}
$options['joins'] = array_merge($options['joins'], $clauses['joins']);
if ($clauses['orders']) {
$order_by_metadata = implode(", ",$clauses['orders']);
if (isset($options['order_by']) && $options['order_by']) {
$options['order_by'] = "$order_by_metadata, {$options['order_by']}";
} else {
$options['order_by'] = "$order_by_metadata, e.time_created DESC";
}
}
}
return $options;
}
/**
* Returns metadata name and value SQL where for entities.
* NB: $names and $values are not paired. Use $pairs for this.
* Pairs default to '=' operand.
*
* This function is reused for annotations because the tables are
* exactly the same.
*
* @param string $e_table Entities table name
* @param string $n_table Normalized metastrings table name (Where entities, values, and names are joined. annotations / metadata)
* @param ARR|NULL $names
* @param ARR|NULL $values
* @param ARR|NULL $pairs array of names / values / operands
* @param AND|OR $pair_operator Operator to use to join the where clauses for pairs
* @param BOOL $case_sensitive
* @param ARR|NULL $order_by_metadata array of names / direction
* @return FALSE|array False on fail, array('joins', 'wheres')
*/
function elgg_get_entity_metadata_where_sql($e_table, $n_table, $names = NULL, $values = NULL, $pairs = NULL, $pair_operator = 'AND', $case_sensitive = TRUE, $order_by_metadata = NULL, $owner_guids = NULL) {
global $CONFIG;
// short circuit if nothing requested
// 0 is a valid (if not ill-conceived) metadata name.
// 0 is also a valid metadata value for FALSE, NULL, or 0
// 0 is also a valid(ish) owner_guid
if ((!$names && $names !== 0)
&& (!$values && $values !== 0)
&& (!$pairs && $pairs !== 0)
&& (!$owner_guids && $owner_guids !== 0)
&& !$order_by_metadata) {
return '';
}
// join counter for incremental joins.
$i = 1;
// binary forces byte-to-byte comparision of strings, making
// it case- and diacritical-mark- sensitive.
// only supported on values.
$binary = ($case_sensitive) ? ' BINARY ' : '';
$access = get_access_sql_suffix('n_table');
$return = array (
'joins' => array (),
'wheres' => array(),
'orders' => array()
);
// will always want to join these tables if pulling metastrings.
$return['joins'][] = "JOIN {$CONFIG->dbprefix}{$n_table} n_table on {$e_table}.guid = n_table.entity_guid";
$wheres = array();
// get names wheres and joins
$names_where = '';
if ($names !== NULL) {
if (!is_array($names)) {
$names = array($names);
}
$sanitised_names = array();
foreach ($names as $name) {
// normalise to 0.
if (!$name) {
$name = '0';
}
$sanitised_names[] = '\'' . sanitise_string($name) . '\'';
}
if ($names_str = implode(',', $sanitised_names)) {
$return['joins'][] = "JOIN {$CONFIG->dbprefix}metastrings msn on n_table.name_id = msn.id";
$names_where = "(msn.string IN ($names_str))";
}
}
// get values wheres and joins
$values_where = '';
if ($values !== NULL) {
if (!is_array($values)) {
$values = array($values);
}
$sanitised_values = array();
foreach ($values as $value) {
// normalize to 0
if (!$value) {
$value = 0;
}
$sanitised_values[] = '\'' . sanitise_string($value) . '\'';
}
if ($values_str = implode(',', $sanitised_values)) {
$return['joins'][] = "JOIN {$CONFIG->dbprefix}metastrings msv on n_table.value_id = msv.id";
$values_where = "({$binary}msv.string IN ($values_str))";
}
}
if ($names_where && $values_where) {
$wheres[] = "($names_where AND $values_where AND $access)";
} elseif ($names_where) {
$wheres[] = "($names_where AND $access)";
} elseif ($values_where) {
$wheres[] = "($values_where AND $access)";
}
// add pairs
// pairs must be in arrays.
if (is_array($pairs)) {
// check if this is an array of pairs or just a single pair.
if (isset($pairs['name']) || isset($pairs['value'])) {
$pairs = array($pairs);
}
$pair_wheres = array();
// @todo when the pairs are > 3 should probably split the query up to
// denormalize the strings table.
foreach ($pairs as $index => $pair) {
// @todo move this elsewhere?
// support shortcut 'n' => 'v' method.
if (!is_array($pair)) {
$pair = array(
'name' => $index,
'value' => $pair
);
}
// must have at least a name and value
if (!isset($pair['name']) || !isset($pair['value'])) {
// @todo should probably return false.
continue;
}
// case sensitivity can be specified per pair.
// default to higher level setting.
if (isset($pair['case_sensitive'])) {
$pair_binary = ($pair['case_sensitive']) ? ' BINARY ' : '';
} else {
$pair_binary = $binary;
}
if (isset($pair['operand'])) {
$operand = sanitise_string($pair['operand']);
} else {
$operand = ' = ';
}
// for comparing
$trimmed_operand = trim(strtolower($operand));
$access = get_access_sql_suffix("n_table{$i}");
// if the value is an int, don't quote it because str '15' < str '5'
// if the operand is IN don't quote it because quoting should be done already.
if (is_numeric($pair['value'])) {
$value = sanitise_string($pair['value']);
} else if (is_array($pair['value'])) {
$values_array = array();
foreach ($pair['value'] as $pair_value) {
if (is_numeric($pair_value)) {
$values_array[] = sanitise_string($pair_value);
} else {
$values_array[] = "'" . sanitise_string($pair_value) . "'";
}
}
if ($values_array) {
$value = '(' . implode(', ', $values_array) . ')';
}
// @todo allow support for non IN operands with array of values.
// will have to do more silly joins.
$operand = 'IN';
} else if ($trimmed_operand == 'in') {
$value = "({$pair['value']})";
} else {
$value = "'" . sanitise_string($pair['value']) . "'";
}
$name = sanitise_string($pair['name']);
// @todo The multiple joins are only needed when the operator is AND
$return['joins'][] = "JOIN {$CONFIG->dbprefix}{$n_table} n_table{$i} on {$e_table}.guid = n_table{$i}.entity_guid";
$return['joins'][] = "JOIN {$CONFIG->dbprefix}metastrings msn{$i} on n_table{$i}.name_id = msn{$i}.id";
$return['joins'][] = "JOIN {$CONFIG->dbprefix}metastrings msv{$i} on n_table{$i}.value_id = msv{$i}.id";
$pair_wheres[] = "(msn{$i}.string = '$name' AND {$pair_binary}msv{$i}.string $operand $value AND $access)";
$i++;
}
if ($where = implode (" $pair_operator ", $pair_wheres)) {
$wheres[] = "($where)";
}
}
// add owner_guids
if ($owner_guids) {
if (is_array($owner_guids)) {
$sanitised = array_map('sanitise_int', $owner_guids);
$owner_str = implode(',', $sanitised);
} else {
$owner_str = sanitise_int($owner_guids);
}
$wheres[] = "(n_table.owner_guid IN ($owner_str))";
}
if ($where = implode(' AND ', $wheres)) {
$return['wheres'][] = "($where)";
}
if (is_array($order_by_metadata)) {
if ((count($order_by_metadata) > 0) && !is_array($order_by_metadata[0])) {
// singleton, so fix
$order_by_metadata = array($order_by_metadata);
}
foreach ($order_by_metadata as $order_by) {
if (is_array($order_by) && isset($order_by['name'])) {
$name = sanitise_string($order_by['name']);
if (isset($order_by['direction'])) {
$direction = sanitise_string($order_by['direction']);
} else {
$direction = 'ASC';
}
$return['joins'][] = "JOIN {$CONFIG->dbprefix}{$n_table} n_table{$i} on {$e_table}.guid = n_table{$i}.entity_guid";
$return['joins'][] = "JOIN {$CONFIG->dbprefix}metastrings msn{$i} on n_table{$i}.name_id = msn{$i}.id";
$return['joins'][] = "JOIN {$CONFIG->dbprefix}metastrings msv{$i} on n_table{$i}.value_id = msv{$i}.id";
$access = get_access_sql_suffix("n_table{$i}");
$return['wheres'][] = "(msn{$i}.string = '$name' AND $access)";
if (isset($order_by['as']) && $order_by['as'] == 'integer') {
$return['orders'][] = "CAST(msv{$i}.string AS SIGNED) $direction";
} else {
$return['orders'][] = "msv{$i}.string $direction";
}
$i++;
}
}
}
return $return;
}
/**
* Return a list of entities based on the given search criteria.
*
* @deprecated 1.7 use elgg_get_entities_from_metadata().
* @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.
* @param int $site_guid The site to get entities for. Leave as 0 (default) for the current site; -1 for all sites.
* @param true|false $count If set to true, returns the total number of entities rather than a list. (Default: false)
* @param true|false $case_sensitive If set to false this searches for the meta data without case sensitivity. (Default: true)
*
* @return int|array A list of entities, or a count if $count is set to true
*/
function get_entities_from_metadata($meta_name, $meta_value = "", $entity_type = "", $entity_subtype = "",
$owner_guid = 0, $limit = 10, $offset = 0, $order_by = "", $site_guid = 0,
$count = FALSE, $case_sensitive = TRUE) {
elgg_deprecated_notice('get_entities_from_metadata() was deprecated by elgg_get_entities_from_metadata()!', 1.7);
$options = array();
$options['metadata_names'] = $meta_name;
if ($meta_value) {
$options['metadata_values'] = $meta_value;
}
if ($entity_type) {
$options['types'] = $entity_type;
}
if ($entity_subtype) {
$options['subtypes'] = $entity_subtype;
}
if ($owner_guid) {
$options['owner_guid'] = $owner_guid;
}
if ($limit) {
$options['limit'] = $limit;
}
if ($offset) {
$options['offset'] = $offset;
}
if ($order_by) {
$options['order_by'];
}
if ($site_guid) {
$options['site_guid'];
}
if ($count) {
$options['count'] = $count;
}
// need to be able to pass false
$options['metadata_case_sensitive'] = $case_sensitive;
return elgg_get_entities_from_metadata($options);
}
/**
* Return a list of entities suitable for display based on the given search criteria.
*
* @see elgg_view_entity_list
*
* @deprecated 1.8 Use elgg_list_entities_from_metadata
* @param mixed $meta_name Metadata name to search on
* @param mixed $meta_value The value to match, optionally
* @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 Number of entities to display per page
* @param true|false $fullview Whether or not to display the full view (default: true)
* @param true|false $viewtypetoggle Whether or not to allow users to toggle to the gallery view. Default: true
* @param true|false $pagination Display pagination? Default: true
*
* @return string A list of entities suitable for display
*/
function list_entities_from_metadata($meta_name, $meta_value = "", $entity_type = ELGG_ENTITIES_ANY_VALUE, $entity_subtype = ELGG_ENTITIES_ANY_VALUE, $owner_guid = 0, $limit = 10, $fullview = true, $viewtypetoggle = true, $pagination = true, $case_sensitive = true ) {
elgg_deprecated_notice('get_entities_from_metadata_multi() was deprecated by elgg_get_entities_from_metadata()!', 1.8);
$offset = (int) get_input('offset');
$limit = (int) $limit;
$options = array(
'metadata_name' => $meta_name,
'metadata_value' => $meta_value,
'types' => $entity_type,
'subtypes' => $entity_subtype,
'owner_guid' => $owner_guid,
'limit' => $limit,
'offset' => $offset,
'count' => TRUE,
'metadata_case_sensitive' => $case_sensitive
);
$count = elgg_get_entities_from_metadata($options);
$options['count'] = FALSE;
$entities = elgg_get_entities_from_metadata($options);
return elgg_view_entity_list($entities, $count, $offset, $limit, $fullview, $viewtypetoggle, $pagination);
}
/**
* Returns a list of entities filtered by provided metadata.
*
* @see elgg_get_entities_from_metadata
*
* @param array $options
*/
function elgg_list_entities_from_metadata($options) {
$defaults = array(
'offset' => (int) max(get_input('offset', 0), 0),
'limit' => (int) max(get_input('limit', 10), 0),
'full_view' => TRUE,
'view_type_toggle' => FALSE,
'pagination' => TRUE
);
$options = array_merge($defaults, $options);
$count = elgg_get_entities_from_metadata(array_merge(array('count' => TRUE), $options));
$entities = elgg_get_entities_from_metadata($options);
return elgg_view_entity_list($entities, $count, $options['offset'], $options['limit'], $options['full_view'], $options['view_type_toggle'], $options['pagination']);
}
/**
* @deprecated 1.7. Use elgg_get_entities_from_metadata().
* @param $meta_array
* @param $entity_type
* @param $entity_subtype
* @param $owner_guid
* @param $limit
* @param $offset
* @param $order_by
* @param $site_guid
* @param $count
* @param $meta_array_operator
* @return unknown_type
*/
function get_entities_from_metadata_multi($meta_array, $entity_type = "", $entity_subtype = "",
$owner_guid = 0, $limit = 10, $offset = 0, $order_by = "", $site_guid = 0,
$count = false, $meta_array_operator = 'and') {
elgg_deprecated_notice('get_entities_from_metadata_multi() was deprecated by elgg_get_entities_from_metadata()!', 1.7);
if (!is_array($meta_array) || sizeof($meta_array) == 0) {
return false;
}
$options = array();
$options['metadata_name_value_pairs'] = $meta_array;
if ($entity_type) {
$options['types'] = $entity_type;
}
if ($entity_subtype) {
$options['subtypes'] = $entity_subtype;
}
if ($owner_guid) {
$options['owner_guid'] = $owner_guid;
}
if ($limit) {
$options['limit'] = $limit;
}
if ($offset) {
$options['offset'] = $offset;
}
if ($order_by) {
$options['order_by'];
}
if ($site_guid) {
$options['site_guid'];
}
if ($count) {
$options['count'] = $count;
}
$options['metadata_name_value_pairs_operator'] = $meta_array_operator;
return elgg_get_entities_from_metadata($options);
}
/**
* Returns a viewable list of entities based on the given search criteria.
*
* @see elgg_view_entity_list
*
* @param array $meta_array Array of 'name' => 'value' pairs
* @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.
* @param true|false $fullview Whether or not to display the full view (default: true)
* @param true|false $viewtypetoggle Whether or not to allow users to toggle to the gallery view. Default: true
* @param true|false $pagination Display pagination? Default: true
* @return string List of ElggEntities suitable for display
*/
function list_entities_from_metadata_multi($meta_array, $entity_type = "", $entity_subtype = "", $owner_guid = 0, $limit = 10, $fullview = true, $viewtypetoggle = true, $pagination = true) {
$offset = (int) get_input('offset');
$limit = (int) $limit;
$count = get_entities_from_metadata_multi($meta_array, $entity_type, $entity_subtype, $owner_guid, $limit, $offset, "", $site_guid, true);
$entities = get_entities_from_metadata_multi($meta_array, $entity_type, $entity_subtype, $owner_guid, $limit, $offset, "", $site_guid, false);
return elgg_view_entity_list($entities, $count, $offset, $limit, $fullview, $viewtypetoggle, $pagination);
}
/**
* 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;
}
/**
* Clear all annotations belonging to a given owner_guid
*
* @param int $owner_guid The owner
*/
function clear_metadata_by_owner($owner_guid) {
global $CONFIG;
$owner_guid = (int)$owner_guid;
$metas = get_data("SELECT id from {$CONFIG->dbprefix}metadata WHERE owner_guid=$owner_guid");
$deleted = 0;
if (is_array($metas)) {
foreach ($metas as $id) {
// Is this the best way?
if (delete_metadata($id->id)) {
$deleted++;
}
}
}
return $deleted;
}
/**
* Handler called by trigger_plugin_hook on the "export" event.
*/
function export_metadata_plugin_hook($hook, $entity_type, $returnvalue, $params) {
// Sanity check values
if ((!is_array($params)) && (!isset($params['guid']))) {
throw new InvalidParameterException(elgg_echo('InvalidParameterException:GUIDNotForExport'));
}
if (!is_array($returnvalue)) {
throw new InvalidParameterException(elgg_echo('InvalidParameterException:NonArrayReturnValue'));
}
$guid = (int)$params['guid'];
$name = $params['name'];
$result = get_metadata_for_entity($guid);
if ($result) {
foreach ($result as $r) {
$returnvalue[] = $r->export();
}
}
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);
$ar = array_map('trim', $ar); // trim blank spaces
$ar = array_map('elgg_strtolower', $ar); // make lower case : [Marcus Povey 20090605 - Using mb wrapper function using UTF8 safe function where available]
$ar = array_filter($ar, 'is_not_null'); // Remove null values
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;
}
/**
* Get the URL for this item of metadata, by default this links to the export handler in the current view.
*
* @param int $id
*/
function get_metadata_url($id) {
$id = (int)$id;
if ($extender = get_metadata($id)) {
return get_extender_url($extender);
}
return false;
}
/**
* Mark entities with a particular type and subtype as having access permissions
* that can be changed independently from their parent entity
*
* @param string $type The type - object, user, etc
* @param string $subtype The subtype; all subtypes by default
*/
function register_metadata_as_independent($type, $subtype = '*') {
global $CONFIG;
if (!isset($CONFIG->independents)) {
$CONFIG->independents = array();
}
$CONFIG->independents[$type][$subtype] = true;
}
/**
* Determines whether entities of a given type and subtype should not change
* their metadata in line with their parent entity
*
* @param string $type The type - object, user, etc
* @param string $subtype The entity subtype
* @return true|false
*/
function is_metadata_independent($type, $subtype) {
global $CONFIG;
if (empty($CONFIG->independents)) {
return false;
}
if (!empty($CONFIG->independents[$type][$subtype])
|| !empty($CONFIG->independents[$type]['*'])) {
return true;
}
return false;
}
/**
* When an entity is updated, resets the access ID on all of its child metadata
*
* @param string $event The name of the event
* @param string $object_type The type of object
* @param ElggEntity $object The entity itself
*/
function metadata_update($event, $object_type, $object) {
if ($object instanceof ElggEntity) {
if (!is_metadata_independent($object->getType(), $object->getSubtype())) {
global $CONFIG;
$access_id = (int) $object->access_id;
$guid = (int) $object->getGUID();
update_data("update {$CONFIG->dbprefix}metadata set access_id = {$access_id} where entity_guid = {$guid}");
}
}
return true;
}
/**
* Register a metadata url handler.
*
* @param string $function_name The function.
* @param string $extender_name The name, default 'all'.
*/
function register_metadata_url_handler($function_name, $extender_name = "all") {
return register_extender_url_handler($function_name, 'metadata', $extender_name);
}
/** Register the hook */
register_plugin_hook("export", "all", "export_metadata_plugin_hook", 2);
/** Call a function whenever an entity is updated **/
register_elgg_event_handler('update','all','metadata_update');
// unit testing
register_plugin_hook('unit_test', 'system', 'metadata_test');
function metadata_test($hook, $type, $value, $params) {
global $CONFIG;
$value[] = $CONFIG->path . 'engine/tests/objects/metadata.php';
return $value;
}
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