From 3014339c5444a0acf91285a21a39c44906185bf2 Mon Sep 17 00:00:00 2001
From: ben <ben@36083f99-b078-4883-b0ff-0f9b5a30f544>
Date: Mon, 6 Oct 2008 17:31:07 +0000
Subject: Introduced a way to either tether metadata access to entities, or to
 make them independent - in either case, explicitly.

git-svn-id: https://code.elgg.org/elgg/trunk@2197 36083f99-b078-4883-b0ff-0f9b5a30f544
---
 engine/lib/metadata.php | 53 ++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 52 insertions(+), 1 deletion(-)

(limited to 'engine')

diff --git a/engine/lib/metadata.php b/engine/lib/metadata.php
index 4c2685296..4084d6959 100644
--- a/engine/lib/metadata.php
+++ b/engine/lib/metadata.php
@@ -766,6 +766,54 @@
 			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;	
 	}
 	
 	/**
@@ -779,5 +827,8 @@
 	}
 		
 	/** Register the hook */
-	register_plugin_hook("export", "all", "export_metadata_plugin_hook", 2);
+	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');
+	
 ?>
\ No newline at end of file
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