2 files changed, 46 insertions, 0 deletions
diff --git a/actions/subgroups/add.php b/actions/subgroups/add.php
new file mode 100644
index 000000000..92416ea05
--- /dev/null
+++ b/actions/subgroups/add.php
@@ -0,0 +1,33 @@
+<?php
+
+elgg_load_library('elgg:subgroups');
+
+$group_guid = get_input('group');
+$othergroup_guid = get_input('othergroup');
+$othergroup_url = get_input('othergroup_url'); // maybe it isn't used
+$group = get_entity($group_guid);
+$othergroup = get_entity($othergroup_guid);
+
+if(!$othergroup && $othergroup = subgroups_get_group_from_url($othergroup_url)){
+	$othergroup_guid = $othergroup->guid;
+}
+
+if ($group instanceof ElggGroup && $group->canEdit() && $othergroup instanceof ElggGroup) {
+	if ($othergroup->canEdit() && $group_guid != $othergroup_guid) {
+		// Check if other group isn't currently a supergroup
+		$tree_group = $group;
+		while ($tree_group->container_guid > 0 && $tree_group->guid != $othergroup_guid) {
+			$tree_group = get_entity($tree_group->container_guid);
+		}
+		// Only save if there isn't circles in the tree.
+		if ($tree_group->guid != $othergroup_guid) {
+			$othergroup->container_guid = $group_guid;
+			$othergroup->save();
+			forward(REFERER);
+		}
+	}
+}
+
+register_error(elgg_echo('subgroups:add:error'));
+forward(REFERER);
+
diff --git a/actions/subgroups/remove.php b/actions/subgroups/remove.php
new file mode 100644
index 000000000..206673de3
--- /dev/null
+++ b/actions/subgroups/remove.php
@@ -0,0 +1,13 @@
+<?php
+
+$group_guid = get_input('group');
+$othergroup_guid = get_input('othergroup');
+$group = get_entity($group_guid);
+$othergroup = get_entity($othergroup_guid);
+if ($group instanceof ElggGroup && $group->canEdit()) {
+	if ($othergroup instanceof ElggGroup && $othergroup->canEdit() && $othergroup->container_guid == $group_guid) {
+		$othergroup->container_guid = $other_group->owner_guid;
+		$othergroup->save();
+	}
+}
+forward(REFERER);