<?php /** * Elgg metastrngs * Functions to manage object metastrings. * * @package Elgg.Core * @subpackage DataModel.MetaStrings */ /** Cache metastrings for a page */ global $METASTRINGS_CACHE; $METASTRINGS_CACHE = array(); /** Keep a record of strings we know don't exist */ global $METASTRINGS_DEADNAME_CACHE; $METASTRINGS_DEADNAME_CACHE = array(); /** * Return the meta string id for a given tag, or false. * * @param string $string The value to store * @param bool $case_sensitive Do we want to make the query case sensitive? * If not there may be more than one result * * @return int|array|false meta string id, array of ids or false if none found */ function get_metastring_id($string, $case_sensitive = TRUE) { global $CONFIG, $METASTRINGS_CACHE, $METASTRINGS_DEADNAME_CACHE; $string = sanitise_string($string); // caching doesn't work for case insensitive searches if ($case_sensitive) { $result = array_search($string, $METASTRINGS_CACHE, true); if ($result !== false) { elgg_log("** Returning id for string:$string from cache."); return $result; } // See if we have previously looked for this and found nothing if (in_array($string, $METASTRINGS_DEADNAME_CACHE, true)) { return false; } // Experimental memcache $msfc = null; static $metastrings_memcache; if ((!$metastrings_memcache) && (is_memcache_available())) { $metastrings_memcache = new ElggMemcache('metastrings_memcache'); } if ($metastrings_memcache) { $msfc = $metastrings_memcache->load($string); } if ($msfc) { return $msfc; } } // Case sensitive if ($case_sensitive) { $query = "SELECT * from {$CONFIG->dbprefix}metastrings where string= BINARY '$string' limit 1"; } else { $query = "SELECT * from {$CONFIG->dbprefix}metastrings where string = '$string'"; } $row = FALSE; $metaStrings = get_data($query, "entity_row_to_elggstar"); if (is_array($metaStrings)) { if (sizeof($metaStrings) > 1) { $ids = array(); foreach ($metaStrings as $metaString) { $ids[] = $metaString->id; } return $ids; } else if (isset($metaStrings[0])) { $row = $metaStrings[0]; } } if ($row) { $METASTRINGS_CACHE[$row->id] = $row->string; // Cache it // Attempt to memcache it if memcache is available if ($metastrings_memcache) { $metastrings_memcache->save($row->string, $row->id); } elgg_log("** Cacheing string '{$row->string}'"); return $row->id; } else { $METASTRINGS_DEADNAME_CACHE[$string] = $string; } return false; } /** * When given an ID, returns the corresponding metastring * * @param int $id Metastring ID * * @return string Metastring */ function get_metastring($id) { global $CONFIG, $METASTRINGS_CACHE; $id = (int) $id; if (isset($METASTRINGS_CACHE[$id])) { elgg_log("** Returning string for id:$id from cache."); return $METASTRINGS_CACHE[$id]; } $row = get_data_row("SELECT * from {$CONFIG->dbprefix}metastrings where id='$id' limit 1"); if ($row) { $METASTRINGS_CACHE[$id] = $row->string; // Cache it elgg_log("** Cacheing string '{$row->string}'"); return $row->string; } return false; } /** * Add a metastring. * It returns the id of the tag, whether by creating it or updating it. * * @param string $string The value (whatever that is) to be stored * @param bool $case_sensitive Do we want to make the query case sensitive? * * @return mixed Integer tag or false. */ function add_metastring($string, $case_sensitive = true) { global $CONFIG, $METASTRINGS_CACHE, $METASTRINGS_DEADNAME_CACHE; $sanstring = sanitise_string($string); $id = get_metastring_id($string, $case_sensitive); if ($id) { return $id; } $result = insert_data("INSERT into {$CONFIG->dbprefix}metastrings (string) values ('$sanstring')"); if ($result) { $METASTRINGS_CACHE[$result] = $string; if (isset($METASTRINGS_DEADNAME_CACHE[$string])) { unset($METASTRINGS_DEADNAME_CACHE[$string]); } } return $result; } /** * Delete any orphaned entries in metastrings. This is run by the garbage collector. * * @return bool * @access private */ function delete_orphaned_metastrings() { global $CONFIG; // If memcache is enabled then we need to flush it of deleted values if (is_memcache_available()) { $select_query = " SELECT * from {$CONFIG->dbprefix}metastrings where ( (id not in (select name_id from {$CONFIG->dbprefix}metadata)) AND (id not in (select value_id from {$CONFIG->dbprefix}metadata)) AND (id not in (select name_id from {$CONFIG->dbprefix}annotations)) AND (id not in (select value_id from {$CONFIG->dbprefix}annotations)) )"; $dead = get_data($select_query); if ($dead) { static $metastrings_memcache; if (!$metastrings_memcache) { $metastrings_memcache = new ElggMemcache('metastrings_memcache'); } foreach ($dead as $d) { $metastrings_memcache->delete($d->string); } } } $query = " DELETE from {$CONFIG->dbprefix}metastrings where ( (id not in (select name_id from {$CONFIG->dbprefix}metadata)) AND (id not in (select value_id from {$CONFIG->dbprefix}metadata)) AND (id not in (select name_id from {$CONFIG->dbprefix}annotations)) AND (id not in (select value_id from {$CONFIG->dbprefix}annotations)) )"; return delete_data($query); } /** * Returns an array of either ElggAnnotation or ElggMetadata objects. * Accepts all elgg_get_entities() options for entity restraints. * * @see elgg_get_entities * * @param array $options Array in format: * * metastring_names => NULL|ARR metastring names * * metastring_values => NULL|ARR metastring values * * metastring_ids => NULL|ARR metastring ids * * metastring_case_sensitive => BOOL Overall Case sensitive * * metastring_owner_guids => NULL|ARR Guids for metadata owners * * metastring_created_time_lower => INT Lower limit for created time. * * metastring_created_time_upper => INT Upper limit for created time. * * metastring_calculation => STR Perform the MySQL function on the metastring values * returned. * This differs from egef_annotation_calculation in that * it returns only the calculation of all annotation values. * You can sum, avg, count, etc. egef_annotation_calculation() * returns ElggEntities ordered by a calculation on their * annotation values. * * metastring_type => STR metadata or annotation(s) * * @return mixed * @access private */ function elgg_get_metastring_based_objects($options) { $options = elgg_normalize_metastrings_options($options); switch ($options['metastring_type']) { case 'metadata': $type = 'metadata'; $callback = 'row_to_elggmetadata'; break; case 'annotations': case 'annotation': $type = 'annotations'; $callback = 'row_to_elggannotation'; break; default: return false; } $defaults = array( // entities 'types' => ELGG_ENTITIES_ANY_VALUE, 'subtypes' => ELGG_ENTITIES_ANY_VALUE, 'type_subtype_pairs' => ELGG_ENTITIES_ANY_VALUE, 'guids' => ELGG_ENTITIES_ANY_VALUE, 'owner_guids' => ELGG_ENTITIES_ANY_VALUE, 'container_guids' => ELGG_ENTITIES_ANY_VALUE, 'site_guids' => get_config('site_guid'), 'modified_time_lower' => ELGG_ENTITIES_ANY_VALUE, 'modified_time_upper' => ELGG_ENTITIES_ANY_VALUE, 'created_time_lower' => ELGG_ENTITIES_ANY_VALUE, 'created_time_upper' => ELGG_ENTITIES_ANY_VALUE, // options are normalized to the plural in case we ever add support for them. 'metastring_names' => ELGG_ENTITIES_ANY_VALUE, 'metastring_values' => ELGG_ENTITIES_ANY_VALUE, //'metastring_name_value_pairs' => ELGG_ENTITIES_ANY_VALUE, //'metastring_name_value_pairs_operator' => 'AND', 'metastring_case_sensitive' => TRUE, //'order_by_metastring' => array(), 'metastring_calculation' => ELGG_ENTITIES_NO_VALUE, 'metastring_created_time_lower' => ELGG_ENTITIES_ANY_VALUE, 'metastring_created_time_upper' => ELGG_ENTITIES_ANY_VALUE, 'metastring_owner_guids' => ELGG_ENTITIES_ANY_VALUE, 'metastring_ids' => ELGG_ENTITIES_ANY_VALUE, // sql 'order_by' => 'n_table.time_created asc', 'limit' => 10, 'offset' => 0, 'count' => FALSE, 'selects' => array(), 'wheres' => array(), 'joins' => array(), 'callback' => $callback ); // @todo Ignore site_guid right now because of #2910 $options['site_guid'] = ELGG_ENTITIES_ANY_VALUE; $options = array_merge($defaults, $options); // can't use helper function with type_subtype_pair because // it's already an array...just need to merge it if (isset($options['type_subtype_pair'])) { if (isset($options['type_subtype_pairs'])) { $options['type_subtype_pairs'] = array_merge($options['type_subtype_pairs'], $options['type_subtype_pair']); } else { $options['type_subtype_pairs'] = $options['type_subtype_pair']; } } $singulars = array( 'type', 'subtype', 'type_subtype_pair', 'guid', 'owner_guid', 'container_guid', 'site_guid', 'metastring_name', 'metastring_value', 'metastring_owner_guid', 'metastring_id', 'select', 'where', 'join' ); $options = elgg_normalise_plural_options_array($options, $singulars); if (!$options) { return false; } $db_prefix = elgg_get_config('dbprefix'); // evaluate where clauses if (!is_array($options['wheres'])) { $options['wheres'] = array($options['wheres']); } $wheres = $options['wheres']; // entities $wheres[] = elgg_get_entity_type_subtype_where_sql('e', $options['types'], $options['subtypes'], $options['type_subtype_pairs']); $wheres[] = elgg_get_guid_based_where_sql('e.guid', $options['guids']); $wheres[] = elgg_get_guid_based_where_sql('e.owner_guid', $options['owner_guids']); $wheres[] = elgg_get_guid_based_where_sql('e.container_guid', $options['container_guids']); $wheres[] = elgg_get_guid_based_where_sql('e.site_guid', $options['site_guids']); $wheres[] = elgg_get_entity_time_where_sql('e', $options['created_time_upper'], $options['created_time_lower'], $options['modified_time_upper'], $options['modified_time_lower']); $wheres[] = elgg_get_entity_time_where_sql('n_table', $options['metastring_created_time_upper'], $options['metastring_created_time_lower'], null, null); $wheres[] = elgg_get_guid_based_where_sql('n_table.owner_guid', $options['metastring_owner_guids']); // see if any functions failed // remove empty strings on successful functions foreach ($wheres as $i => $where) { if ($where === FALSE) { return FALSE; } elseif (empty($where)) { unset($wheres[$i]); } } // remove identical where clauses $wheres = array_unique($wheres); // evaluate join clauses if (!is_array($options['joins'])) { $options['joins'] = array($options['joins']); } $joins = $options['joins']; $joins[] = "JOIN {$db_prefix}entities e ON n_table.entity_guid = e.guid"; // evaluate selects if (!is_array($options['selects'])) { $options['selects'] = array($options['selects']); } $selects = $options['selects']; // allow count shortcut if ($options['count']) { $options['metastring_calculation'] = 'count'; } // For performance reasons we don't want the joins required for metadata / annotations // unless we're going through one of their callbacks. // this means we expect the functions passing different callbacks to pass their required joins. // If we're doing a calculation $custom_callback = ($options['callback'] == 'row_to_elggmetadata' || $options['callback'] == 'row_to_elggannotation'); $is_calculation = $options['metastring_calculation'] ? true : false; if ($custom_callback || $is_calculation) { $joins[] = "JOIN {$db_prefix}metastrings n on n_table.name_id = n.id"; $joins[] = "JOIN {$db_prefix}metastrings v on n_table.value_id = v.id"; $selects[] = 'n.string as name'; $selects[] = 'v.string as value'; } foreach ($joins as $i => $join) { if ($join === FALSE) { return FALSE; } elseif (empty($join)) { unset($joins[$i]); } } // metastrings $metastring_clauses = elgg_get_metastring_sql('n_table', $options['metastring_names'], $options['metastring_values'], null, $options['metastring_ids'], $options['metastring_case_sensitive']); if ($metastring_clauses) { $wheres = array_merge($wheres, $metastring_clauses['wheres']); $joins = array_merge($joins, $metastring_clauses['joins']); } if ($options['metastring_calculation'] === ELGG_ENTITIES_NO_VALUE) { $selects = array_unique($selects); // evalutate selects $select_str = ''; if ($selects) { foreach ($selects as $select) { $select_str .= ", $select"; } } $query = "SELECT DISTINCT n_table.*{$select_str} FROM {$db_prefix}$type n_table"; } else { $query = "SELECT {$options['metastring_calculation']}(v.string) as calculation FROM {$db_prefix}$type n_table"; } // remove identical join clauses $joins = array_unique($joins); // add joins foreach ($joins as $j) { $query .= " $j "; } // add wheres $query .= ' WHERE '; foreach ($wheres as $w) { $query .= " $w AND "; } // Add access controls $query .= get_access_sql_suffix('e'); // reverse order by if (isset($options['reverse_order_by']) && $options['reverse_order_by']) { $options['order_by'] = elgg_sql_reverse_order_by_clause($options['order_by'], $defaults['order_by']); } if ($options['metastring_calculation'] === ELGG_ENTITIES_NO_VALUE) { if (isset($options['group_by'])) { $options['group_by'] = sanitise_string($options['group_by']); $query .= " GROUP BY {$options['group_by']}"; } if (isset($options['order_by']) && $options['order_by']) { $options['order_by'] = sanitise_string($options['order_by']); $query .= " ORDER BY {$options['order_by']}, n_table.id"; } if ($options['limit']) { $limit = sanitise_int($options['limit']); $offset = sanitise_int($options['offset'], false); $query .= " LIMIT $offset, $limit"; } $dt = get_data($query, $options['callback']); return $dt; } else { $result = get_data_row($query); return $result->calculation; } } /** * Returns an array of joins and wheres for use in metastrings. * * @note The $pairs is reserved for name/value pairs if we want to implement those. * * @param string $table The annotation or metadata table name or alias * @param array $names An array of names * @param array $values An array of values * @param array $pairs Name / value pairs. Not currently used. * @param array $ids Metastring IDs * @param bool $case_sensitive Should name and values be case sensitive? * * @return array * @access private */ function elgg_get_metastring_sql($table, $names = null, $values = null, $pairs = null, $ids = null, $case_sensitive = false) { if ((!$names && $names !== 0) && (!$values && $values !== 0) && !$ids && (!$pairs && $pairs !== 0)) { return ''; } $db_prefix = elgg_get_config('dbprefix'); // 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 ' : ''; $access = get_access_sql_suffix($table); $return = array ( 'joins' => array (), 'wheres' => array() ); $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)) { $return['joins'][] = "JOIN {$db_prefix}metastrings msn on $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)) { $return['joins'][] = "JOIN {$db_prefix}metastrings msv on $table.value_id = msv.id"; $values_where = "({$binary}msv.string IN ($values_str))"; } } if ($ids !== NULL) { if (!is_array($ids)) { $ids = array($ids); } $ids_str = implode(',', $ids); if ($ids_str) { $wheres[] = "n_table.id IN ($ids_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 $access)"; } if ($where = implode(' AND ', $wheres)) { $return['wheres'][] = "($where)"; } return $return; } /** * Normalizes metadata / annotation option names to their corresponding metastrings name. * * @param array $options An options array * @since 1.8.0 * @return array * @access private */ function elgg_normalize_metastrings_options(array $options = array()) { // support either metastrings_type or metastring_type // because I've made this mistake many times and hunting it down is a pain... $type = elgg_extract('metastring_type', $options, null); $type = elgg_extract('metastrings_type', $options, $type); $options['metastring_type'] = $type; // support annotation_ and annotations_ because they're way too easy to confuse $prefixes = array('metadata_', 'annotation_', 'annotations_'); // map the metadata_* options to metastring_* options $map = array( 'names' => 'metastring_names', 'values' => 'metastring_values', 'case_sensitive' => 'metastring_case_sensitive', 'owner_guids' => 'metastring_owner_guids', 'created_time_lower' => 'metastring_created_time_lower', 'created_time_upper' => 'metastring_created_time_upper', 'calculation' => 'metastring_calculation', 'ids' => 'metastring_ids' ); foreach ($prefixes as $prefix) { $singulars = array("{$prefix}name", "{$prefix}value", "{$prefix}owner_guid", "{$prefix}id"); $options = elgg_normalise_plural_options_array($options, $singulars); foreach ($map as $specific => $normalized) { $key = $prefix . $specific; if (isset($options[$key])) { $options[$normalized] = $options[$key]; } } } return $options; } /** * Enables or disables a metastrings-based object by its id. * * @warning To enable disabled metastrings you must first use * {@link access_show_hidden_entities()}. * * @param int $id The object's ID * @param string $enabled Value to set to: yes or no * @param string $type The type of table to use: metadata or anntations * * @return bool * @since 1.8.0 * @access private */ function elgg_set_metastring_based_object_enabled_by_id($id, $enabled, $type) { $id = (int)$id; $db_prefix = elgg_get_config('dbprefix'); $object = elgg_get_metastring_based_object_from_id($id, $type); switch($type) { case 'annotation': case 'annotations': $table = "{$db_prefix}annotations"; break; case 'metadata': $table = "{$db_prefix}metadata"; break; } if ($enabled === 'yes' || $enabled === 1 || $enabled === true) { $enabled = 'yes'; $event = 'enable'; } elseif ($enabled === 'no' || $enabled === 0 || $enabled === false) { $enabled = 'no'; $event = 'disable'; } else { return false; } $return = false; if ($object) { // don't set it if it's already set. if ($object->enabled == $enabled) { $return = false; } elseif ($object->canEdit() && (elgg_trigger_event($event, $type, $object))) { $return = update_data("UPDATE $table SET enabled = '$enabled' where id = $id"); } } return $return; } /** * Runs metastrings-based objects found using $options through $callback * * @warning Unlike elgg_get_metastring_based_objects() this will not accept an * empty options array! * * @param array $options An options array. {@See elgg_get_metastring_based_objects()} * @param string $callback The callback to pass each result through * @return mixed * @since 1.8.0 * @access private */ function elgg_batch_metastring_based_objects(array $options, $callback) { if (!$options || !is_array($options)) { return false; } // @todo restore once ElggBatch supports callbacks that delete rows. $batch = new ElggBatch('elgg_get_metastring_based_objects', $options, $callback, 50, false); $r = $batch->callbackResult; return $r; } /** * Returns a singular metastring-based object by its ID. * * @param int $id The metastring-based object's ID * @param string $type The type: annotation or metadata * @return mixed * * @since 1.8.0 * @access private */ function elgg_get_metastring_based_object_from_id($id, $type) { $id = (int)$id; if (!$id) { return false; } $options = array( 'metastring_type' => $type, 'metastring_id' => $id ); $obj = elgg_get_metastring_based_objects($options); if ($obj && count($obj) == 1) { return $obj[0]; } return false; } /** * Deletes a metastring-based object by its id * * @param int $id The object's ID * @param string $type The object's metastring type: annotation or metadata * @return bool * * @since 1.8.0 * @access private */ function elgg_delete_metastring_based_object_by_id($id, $type) { $id = (int)$id; $db_prefix = elgg_get_config('dbprefix'); switch ($type) { case 'annotation': case 'annotations': $type = 'annotations'; break; case 'metadata': $type = 'metadata'; break; default: return false; } $obj = elgg_get_metastring_based_object_from_id($id, $type); $table = $db_prefix . $type; if ($obj) { // Tidy up if memcache is enabled. // @todo only metadata is supported if ($type == 'metadata') { static $metabyname_memcache; if ((!$metabyname_memcache) && (is_memcache_available())) { $metabyname_memcache = new ElggMemcache('metabyname_memcache'); } if ($metabyname_memcache) { $metabyname_memcache->delete("{$obj->entity_guid}:{$obj->name_id}"); } } if (($obj->canEdit()) && (elgg_trigger_event('delete', $type, $obj))) { return (bool)delete_data("DELETE from $table where id=$id"); } } return false; } /** * Entities interface helpers */ /** * Returns options to pass to elgg_get_entities() for metastrings operations. * * @param string $type Metastring type: annotations or metadata * @param array $options Options * * @return array * @since 1.7.0 * @access private */ function elgg_entities_get_metastrings_options($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; } // unit testing elgg_register_plugin_hook_handler('unit_test', 'system', 'metastrings_test'); /** * Metadata unit test * * @param string $hook unit_test * @param string $type system * @param mixed $value Array of other tests * @param mixed $params Params * * @return array * @access private */ function metastrings_test($hook, $type, $value, $params) { global $CONFIG; $value[] = $CONFIG->path . 'engine/tests/api/metastrings.php'; return $value; }