migrateSubjectPermissions(GLOBAL_SUBJECT);
        for (Subject group : permissionService.getGroupSubjects().getLoadedSubjects()) {
            GriefPreventionPlugin.instance.getLogger().info("Scanning group '" + group.getIdentifier() + "' for legacy permissions...");
            migrateSubjectPermissions(group);
            GriefPreventionPlugin.instance.getLogger().info("Finished scan on group '" + group.getIdentifier() + "'.");
        }

private static void migrateSubjectPermissions(Subject subject) {
        for (Map.Entry<Set<Context>, Map<String, Boolean>> mapEntry : subject.getSubjectData().getAllPermissions().entrySet()) {
            final Set<Context> contextSet = mapEntry.getKey();
            boolean hasSource = false;
            for (String key : mapEntry.getValue().keySet()) {
                if (key.contains(".source.")) {
                    final String[] parts = key.split("\\.source\\.");
                    if (parts.length > 0) {
                        hasSource = true;
                        break;
                    }
                }
            }
            if (hasSource) {
                Iterator<Map.Entry<String, Boolean>> iterator = mapEntry.getValue().entrySet().iterator();
                while (iterator.hasNext()) {
                    final Map.Entry<String, Boolean> entry = iterator.next();
                    String currentPermission = entry.getKey();
                    final String[] parts = currentPermission.split("\\.source\\.");
                    if (parts.length > 1) {
                        final String newPermission = parts[0];
                        GriefPreventionPlugin.instance.getLogger().info("Detected legacy permission '" + currentPermission + "'. Migrating...");
                        final String sourceId = parts[1].replace(".", ":");
                        Set<Context> newContextSet = new HashSet<>(contextSet);
                        if (newPermission.contains("interact") && ITEM_IDS.contains(sourceId)) {
                            newContextSet.add(new Context("used_item", sourceId));
                            GriefPreventionPlugin.instance.getLogger().info("Created new used_item context for '" + sourceId + "'.");
                        } else {
                            newContextSet.add(new Context("source", sourceId));
                            GriefPreventionPlugin.instance.getLogger().info("Created new source context for '" + sourceId + "'.");
                        }
                        // remove old perm
                        subject.getSubjectData().setPermission(contextSet, currentPermission, Tristate.UNDEFINED);
                        GriefPreventionPlugin.instance.getLogger().info("Removed legacy permission '" + currentPermission + "'.");
                        // add migrated perm with new source context
                        subject.getSubjectData().setPermission(newContextSet, newPermission, Tristate.fromBoolean(entry.getValue()));
                        GriefPreventionPlugin.instance.getLogger().info("Set new permission '" + newPermission + "' with contexts " + newContextSet);
                        GriefPreventionPlugin.instance.getLogger().info("Successfully migrated permission " + currentPermission + " to " + newPermission + " with context " + sourceId + "\n");
                    }
                }
            }
        }
    }