diff options
Diffstat (limited to 'engine/lib/metadata.php')
| -rw-r--r-- | engine/lib/metadata.php | 1707 |
1 files changed, 885 insertions, 822 deletions
diff --git a/engine/lib/metadata.php b/engine/lib/metadata.php index c6e5db4cd..5ca39b586 100644 --- a/engine/lib/metadata.php +++ b/engine/lib/metadata.php @@ -1,912 +1,975 @@ <?php - /** - * Elgg metadata - * Functions to manage object metadata. - * - * @package Elgg - * @subpackage Core - - * @author Curverider Ltd <info@elgg.com> - - * @link http://elgg.org/ - */ +/** + * 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 { /** - * ElggMetadata - * This class describes metadata that can be attached to ElggEntities. - * - * @author Curverider Ltd <info@elgg.com> - * @package Elgg - * @subpackage Core + * Construct a new site object, optionally from a given id value or row. + * + * @param mixed $id */ - 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, $value); - } + function __construct($id = null) { + $this->attributes = array(); - /** - * Determines whether or not the user can edit this piece of metadata - * - * @return true|false Depending on permissions - */ - function canEdit() { - - if ($entity = get_entity($this->get('entity_guid'))) { - return $entity->canEditMetadata($this); + if (!empty($id)) { + // Create from db row + if ($id instanceof stdClass) { + $metadata = $id; + } else { + $metadata = get_metadata($id); } - 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 $this->id; + + if ($metadata) { + $objarray = (array) $metadata; + foreach($objarray as $key => $value) { + $this->attributes[$key] = $value; + } + $this->attributes['type'] = "metadata"; } - } - - /** - * Delete a given metadata. - */ - function delete() - { - return delete_metadata($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 + * Class member get overloading * - * @param stdClass $row - * @return stdClass or ElggMetadata + * @param string $name + * @return mixed */ - function row_to_elggmetadata($row) - { - if (!($row instanceof stdClass)) - return $row; - - return new ElggMetadata($row); + function __get($name) { + return $this->get($name); } - /** - * Get a specific item of metadata. - * - * @param $id int The item of metadata being retrieved. + * Class member set overloading + * + * @param string $name + * @param mixed $value + * @return mixed */ - function get_metadata($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 $md_access")); + function __set($name, $value) { + return $this->set($name, $value); } - + /** - * Removes metadata on an entity with a particular name, optionally with a given value. + * Determines whether or not the user can edit this piece of metadata * - * @param int $entity_guid The entity GUID - * @param string $name The name of the metadata - * @param string $value The optional value of the item (useful for removing a single item in a multiple set) - * @return true|false Depending on success + * @return true|false Depending on permissions */ - function remove_metadata($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; + function canEdit() { + if ($entity = get_entity($this->get('entity_guid'))) { + return $entity->canEditMetadata($this); } return false; - } - + /** - * Create a new metadata object, or update an existing one. + * Save matadata object * - * @param int $entity_guid - * @param string $name - * @param string $value - * @param string $value_type - * @param int $owner_guid - * @param int $access_id - * @param bool $allow_multiple + * @return int the metadata object id */ - function create_metadata($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); - } + 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())); } - - } else if ($existing) { -// TODO: Check... are you sure you meant to do this Ben? :) - $id = $existing->id; - delete_metadata($id); - + return $this->id; } - - return $id; } - + + /** + * Delete a given metadata. + */ + function delete() { + return delete_metadata($this->id); + } + /** - * Update an item of metadata. + * Get a url for this item of metadata. * - * @param int $id - * @param string $name - * @param string $value - * @param string $value_type - * @param int $owner_guid - * @param int $access_id + * @return string */ - function update_metadata($id, $name, $value, $value_type, $owner_guid, $access_id) - { - global $CONFIG; + public function getURL() { + return get_metadata_url($this->id); + } - $id = (int)$id; + // SYSTEM LOG INTERFACE //////////////////////////////////////////////////////////// - if (!$md = get_metadata($id)) return false; - if (!$md->canEdit()) return false; + /** + * For a given ID, return the object associated with it. + * This is used by the river functionality primarily. + * This is useful for checking access permissions etc on objects. + */ + public function getObjectFromID($id) { + return get_metadata($id); + } +} - // 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) +/** + * 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 + * @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 = 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 ($value) + if ($value) { $value = 1; - else + } else { $value = 0; + } } - - // Add the metastring + + // Add the metastrings $value = add_metastring($value); - if (!$value) return false; - + if (!$value) { + return false; + } + $name = add_metastring($name); - if (!$name) return false; + if (!$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 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 ($result!==false) { + if ($id!==false) { $obj = get_metadata($id); - if (trigger_elgg_event('update', 'metadata', $obj)) { + if (trigger_elgg_event('create', 'metadata', $obj)) { return true; } else { delete_metadata($id); } } - - return $result; + + } else if ($existing) { + // TODO: Check... are you sure you meant to do this Ben? :) + $id = $existing->id; + delete_metadata($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 = 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; + + 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; } - - /** - * 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=$id"); - } - + if (!$md->canEdit()) { 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 $md_access", "row_to_elggmetadata"); - if (!$result) - return false; - - // Cache if memcache available - if ($metabyname_memcache) - { - if (count($result) == 1) $r = $result[0]; else $r = $result; - $metabyname_memcache->setDefaultExpiry(3600); // 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. - $metabyname_memcache->save("{$entity_guid}:{$meta_name}", $r); - - } - if (count($result) == 1) - return $result[0]; - - return $result; + // 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'); } - - /** - * 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 $md_access", "row_to_elggmetadata"); + + if ($metabyname_memcache) { + $metabyname_memcache->delete("{$md->entity_guid}:{$md->name_id}"); } - /** - * 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) return false; // The value is set, but we didn't get a value... so something went wrong. - $where[] = "m.name_id='$meta_n'"; - } - if ($meta_value!="") { - if (!$meta_v) return false; // The value is set, but we didn't get a value... so something went wrong. - $where[] = "m.value_id='$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, $limit"; // Add order and limit + //$name = sanitise_string(trim($name)); + //$value = sanitise_string(trim($value)); + $value_type = detect_extender_valuetype($value, sanitise_string(trim($value_type))); - return get_data($query, "row_to_elggmetadata"); + $owner_guid = (int)$owner_guid; + if ($owner_guid==0) { + $owner_guid = get_loggedin_userid(); } - - /** - * 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. - * @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) - * - * @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) - { - 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"; - else - $order_by = "e.time_created, {$order_by}"; - $order_by = sanitise_string($order_by); - $site_guid = (int) $site_guid; - if ((is_array($owner_guid) && (count($owner_guid)))) { - foreach($owner_guid as $key => $guid) { - $owner_guid[$key] = (int) $guid; - } - } else { - $owner_guid = (int) $owner_guid; - } - if ($site_guid == 0) - $site_guid = $CONFIG->site_guid; - - //$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'"; - if ($site_guid > 0) - $where[] = "e.site_guid = {$site_guid}"; - if (is_array($owner_guid)) { - $where[] = "e.container_guid in (".implode(",",$owner_guid).")"; - } else if ($owner_guid > 0) - $where[] = "e.container_guid = {$owner_guid}"; - - if (!$count) { - $query = "SELECT distinct e.* "; - } else { - $query = "SELECT count(distinct e.guid) as total "; - } - - $query .= "from {$CONFIG->dbprefix}entities e JOIN {$CONFIG->dbprefix}metadata m on e.guid = m.entity_guid where"; - foreach ($where as $w) - $query .= " $w and "; - $query .= get_access_sql_suffix("e"); // Add access controls - $query .= ' and ' . get_access_sql_suffix("m"); // Add access controls - - if (!$count) { - $query .= " order by $order_by limit $offset, $limit"; // Add order and limit - return get_data($query, "entity_row_to_elggstar"); + + $access_id = (int)$access_id; + + $access = get_access_sql_suffix(); + + // Support boolean types (as integers) + if (is_bool($value)) { + if ($value) { + $value = 1; } else { - if ($row = get_data_row($query)) - return $row->total; + $value = 0; } + } + + // Add the metastring + $value = add_metastring($value); + if (!$value) { return false; } - - /** - * Return a list of entities suitable for display based on the given search criteria. - * - * @see elgg_view_entity_list - * - * @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 = "", $entity_subtype = "", $owner_guid = 0, $limit = 10, $fullview = true, $viewtypetoggle = true, $pagination = true) { - - $offset = (int) get_input('offset'); - $limit = (int) $limit; - $count = get_entities_from_metadata($meta_name, $meta_value, $entity_type, $entity_subtype, $owner_guid, $limit, $offset, "", 0, true); - $entities = get_entities_from_metadata($meta_name, $meta_value, $entity_type, $entity_subtype, $owner_guid, $limit, $offset, "", 0, false); - - return elgg_view_entity_list($entities, $count, $offset, $limit, $fullview, $viewtypetoggle, $pagination); - + + $name = add_metastring($name); + if (!$name) { + return false; } - /** - * Returns a list of entities based on the given search criteria. - * - * @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 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 string $meta_array_operator Operator used for joining the metadata array together - * @return int|array List of ElggEntities, or the total number if count is set to false - */ - function get_entities_from_metadata_multi($meta_array, $entity_type = "", $entity_subtype = "", $owner_guid = 0, $limit = 10, $offset = 0, $order_by = "", $site_guid = 0, $count = false, $meta_array_operator = 'and') - { - global $CONFIG; - - if (!is_array($meta_array) || sizeof($meta_array) == 0) { + // 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; } - - $where = array(); - - $mindex = 1; - $join = ""; - $metawhere = array(); - $meta_array_operator = sanitise_string($meta_array_operator); - foreach($meta_array as $meta_name => $meta_value) { - $meta_n = get_metastring_id($meta_name); - $meta_v = get_metastring_id($meta_value); - $join .= " JOIN {$CONFIG->dbprefix}metadata m{$mindex} on e.guid = m{$mindex}.entity_guid "; - /*if ($meta_name!=="") - $where[] = "m{$mindex}.name_id='$meta_n'"; - if ($meta_value!=="") - $where[] = "m{$mindex}.value_id='$meta_v'";*/ - $metawhere[] = "(m{$mindex}.name_id='$meta_n' AND m{$mindex}.value_id='$meta_v')"; - $mindex++; + } + 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'); } - $where[] = "(".implode($meta_array_operator, $metawhere).")"; - - $entity_type = sanitise_string($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); - if ((is_array($owner_guid) && (count($owner_guid)))) { - foreach($owner_guid as $key => $guid) { - $owner_guid[$key] = (int) $guid; - } - } else { - $owner_guid = (int) $owner_guid; + + if ($metabyname_memcache) { + $metabyname_memcache->delete("{$metadata->entity_guid}:{$metadata->name_id}"); } - - $site_guid = (int) $site_guid; - if ($site_guid == 0) - $site_guid = $CONFIG->site_guid; - - //$access = get_access_list(); - - if ($entity_type!="") - $where[] = "e.type = '{$entity_type}'"; - if ($entity_subtype) - $where[] = "e.subtype = {$entity_subtype}"; - if ($site_guid > 0) - $where[] = "e.site_guid = {$site_guid}"; - if (is_array($owner_guid)) { - $where[] = "e.container_guid in (".implode(",",$owner_guid).")"; - } else if ($owner_guid > 0) - $where[] = "e.container_guid = {$owner_guid}"; - //if ($owner_guid > 0) - // $where[] = "e.container_guid = {$owner_guid}"; - - if ($count) { - $query = "SELECT count(distinct e.guid) as total "; + + if (($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 $md_access", "row_to_elggmetadata"); + if (!$result) { + return false; + } + + // Cache if memcache available + if ($metabyname_memcache) { + if (count($result) == 1) { + $r = $result[0]; } else { - $query = "SELECT distinct e.* "; + $r = $result; } - - $query .= " from {$CONFIG->dbprefix}entities e {$join} where"; - foreach ($where as $w) - $query .= " $w and "; - $query .= get_access_sql_suffix("e"); // Add access controls - - $mindex = 1; - foreach($meta_array as $meta_name => $meta_value) { - $query .= ' and ' . get_access_sql_suffix("m{$mindex}"); // Add access controls - $mindex++; + // 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; } - - if (!$count) { - $query .= " order by $order_by limit $offset, $limit"; // Add order and limit - return get_data($query, "entity_row_to_elggstar"); - } else { - if ($count = get_data_row($query)) { - return $count->total; - } + $where[] = "m.name_id='$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; } - return false; + $where[] = "m.value_id='$meta_v'"; } - - /** - * 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={$entity_guid}"); + if ($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"); +} + +/** + * 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. + * @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) + * + * @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) { + 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"; + } else { + $order_by = "e.time_created, {$order_by}"; + } + $order_by = sanitise_string($order_by); + $site_guid = (int) $site_guid; + if ((is_array($owner_guid) && (count($owner_guid)))) { + foreach($owner_guid as $key => $guid) { + $owner_guid[$key] = (int) $guid; } + } else { + $owner_guid = (int) $owner_guid; + } + if ($site_guid == 0) { + $site_guid = $CONFIG->site_guid; + } + + //$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'"; + } + if ($site_guid > 0) { + $where[] = "e.site_guid = {$site_guid}"; + } + if (is_array($owner_guid)) { + $where[] = "e.container_guid in (".implode(",",$owner_guid).")"; + } else if ($owner_guid > 0) { + $where[] = "e.container_guid = {$owner_guid}"; + } + + if (!$count) { + $query = "SELECT distinct e.* "; + } else { + $query = "SELECT count(distinct e.guid) as total "; + } + + $query .= "from {$CONFIG->dbprefix}entities e JOIN {$CONFIG->dbprefix}metadata m on e.guid = m.entity_guid where"; + foreach ($where as $w) { + $query .= " $w and "; + } + $query .= get_access_sql_suffix("e"); // Add access controls + $query .= ' and ' . get_access_sql_suffix("m"); // Add access controls + + if (!$count) { + $query .= " order by $order_by limit $offset, $limit"; // Add order and limit + return get_data($query, "entity_row_to_elggstar"); + } else { + if ($row = get_data_row($query)) { + return $row->total; + } + } + return false; +} + +/** + * Return a list of entities suitable for display based on the given search criteria. + * + * @see elgg_view_entity_list + * + * @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 = "", $entity_subtype = "", $owner_guid = 0, $limit = 10, $fullview = true, $viewtypetoggle = true, $pagination = true) { + $offset = (int) get_input('offset'); + $limit = (int) $limit; + $count = get_entities_from_metadata($meta_name, $meta_value, $entity_type, $entity_subtype, $owner_guid, $limit, $offset, "", 0, true); + $entities = get_entities_from_metadata($meta_name, $meta_value, $entity_type, $entity_subtype, $owner_guid, $limit, $offset, "", 0, false); + + return elgg_view_entity_list($entities, $count, $offset, $limit, $fullview, $viewtypetoggle, $pagination); +} + +/** + * Returns a list of entities based on the given search criteria. + * + * @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 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 string $meta_array_operator Operator used for joining the metadata array together + * @return int|array List of ElggEntities, or the total number if count is set to false + */ +function get_entities_from_metadata_multi($meta_array, $entity_type = "", $entity_subtype = "", $owner_guid = 0, $limit = 10, $offset = 0, $order_by = "", $site_guid = 0, $count = false, $meta_array_operator = 'and') { + global $CONFIG; + + if (!is_array($meta_array) || sizeof($meta_array) == 0) { 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"); - $deleted = 0; - - foreach ($metas as $id) - { - if (delete_metadata($id->id)) // Is this the best way? - $deleted++; + + $where = array(); + + $mindex = 1; + $join = ""; + $metawhere = array(); + $meta_array_operator = sanitise_string($meta_array_operator); + foreach($meta_array as $meta_name => $meta_value) { + $meta_n = get_metastring_id($meta_name); + $meta_v = get_metastring_id($meta_value); + $join .= " JOIN {$CONFIG->dbprefix}metadata m{$mindex} on e.guid = m{$mindex}.entity_guid "; + /*if ($meta_name!=="") + $where[] = "m{$mindex}.name_id='$meta_n'"; + if ($meta_value!=="") + $where[] = "m{$mindex}.value_id='$meta_v'";*/ + $metawhere[] = "(m{$mindex}.name_id='$meta_n' AND m{$mindex}.value_id='$meta_v')"; + $mindex++; + } + $where[] = "(".implode($meta_array_operator, $metawhere).")"; + + $entity_type = sanitise_string($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); + if ((is_array($owner_guid) && (count($owner_guid)))) { + foreach($owner_guid as $key => $guid) { + $owner_guid[$key] = (int) $guid; } - - return $deleted; + } else { + $owner_guid = (int) $owner_guid; } - - /** - * Handler called by trigger_plugin_hook on the "export" event. - */ - function export_metadata_plugin_hook($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(); + + $site_guid = (int) $site_guid; + if ($site_guid == 0) { + $site_guid = $CONFIG->site_guid; + } + + //$access = get_access_list(); + + if ($entity_type!="") { + $where[] = "e.type = '{$entity_type}'"; + } + + if ($entity_subtype) { + $where[] = "e.subtype = {$entity_subtype}"; + } + + if ($site_guid > 0) { + $where[] = "e.site_guid = {$site_guid}"; + } + + if (is_array($owner_guid)) { + $where[] = "e.container_guid in (".implode(",",$owner_guid).")"; + } else if ($owner_guid > 0) { + $where[] = "e.container_guid = {$owner_guid}"; + } + + //if ($owner_guid > 0) + // $where[] = "e.container_guid = {$owner_guid}"; + + if ($count) { + $query = "SELECT count(distinct e.guid) as total "; + } else { + $query = "SELECT distinct e.* "; + } + + $query .= " from {$CONFIG->dbprefix}entities e {$join} where"; + foreach ($where as $w) { + $query .= " $w and "; + } + $query .= get_access_sql_suffix("e"); // Add access controls + + $mindex = 1; + foreach($meta_array as $meta_name => $meta_value) { + $query .= ' and ' . get_access_sql_suffix("m{$mindex}"); // Add access controls + $mindex++; + } + + if (!$count) { + $query .= " order by $order_by limit $offset, $limit"; // Add order and limit + return get_data($query, "entity_row_to_elggstar"); + } else { + if ($count = get_data_row($query)) { + return $count->total; } - - 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; +} + +/** + * 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; - } - - /** - * 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 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"); + $deleted = 0; + + foreach ($metas as $id) { + // Is this the best way? + if (delete_metadata($id->id)) { + $deleted++; } - - 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; + + 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')); } - - /** - * 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][$subtype] = true; + + if (!is_array($returnvalue)) { + throw new InvalidParameterException(elgg_echo('InvalidParameterException:NonArrayReturnValue')); } - - /** - * 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; + + $guid = (int)$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; } - - /** - * 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; + 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}"); + } } - - /** - * 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'); - -?> + 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');
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