Enable meta groups in Model\Group::getIdsByContactId

- Don't return early if contact isn't part of any group in PermissionSet::get

src/Model/Group.php

@@ -117,6 +117,16 @@ class Group
 		}
 		DBA::close($stmt);
 
+		// Meta-groups
+		$contact = Contact::getById($cid, ['rel']);
+		if ($contact['rel'] == Contact::FOLLOWER || $contact['rel'] == Contact::FRIEND) {
+			$return[] = self::FOLLOWERS;
+		}
+
+		if ($contact['rel'] == Contact::FRIEND) {
+			$return[] = self::MUTUALS;
+		}
+
 		return $return;
 	}
 

src/Model/PermissionSet.php

@@ -82,14 +82,9 @@ class PermissionSet
 			$groups = Group::getIdsByContactId($contact_id);
 		}
 
-		if (empty($groups) || !is_array($groups)) {
-			return [];
-		}
-
 		$group_str = '<<>>'; // should be impossible to match
-
-		foreach ($groups as $g) {
-			$group_str .= '|<' . intval($g) . '>';
+		foreach ($groups as $group_id) {
+			$group_str .= '|<' . preg_quote($group_id) . '>';
 		}
 
 		$contact_str = '<' . $contact_id . '>';