Merge https://github.com/minetest-mods/xban2, Cleanup function

Modify cleanup function to remove only uninteresting entries, not only
not banned users. This makes the function more suitable to an xban mod
where ban is not the only type of entry available.

README.md

@@ -116,3 +116,9 @@ the supported import plugins at the time of writing:
 * `v2`: Old format used by xban (`players.iplist.v2`).
 
 **Example:** `/xban_dbi minetest`
+
+### `xban_cleanup`
+
+Removes all non-banned entries from the xban db.
+
+**Usage:** `/xban_cleanup`

gui.lua

@@ -9,7 +9,7 @@ local ESC = minetest.formspec_escape
 local function make_list(filter)
 	filter = filter or ""
 	local list, n, dropped = { }, 0, false
-	for k in pairs(minetest.auth_table) do
+	for k in minetest.get_auth_handler().iterate() do
 		if strfind(k, filter, 1, true) then
 			if n >= MAXLISTSIZE then
 				dropped = true

init.lua

@@ -181,9 +181,8 @@ function xban.add_whitelist(name_or_ip, source)
 	}
 	return true
 end
-
-function xban.get_alt_accounts(player)
-	local e = xban.find_entry(player)
+function xban.get_account_names(e)
+	-- get accounts associated with entry
 	local names = {}
 	if not e then
 		return nil, ("No entry for `%s'"):format(player)
@@ -196,6 +195,11 @@ function xban.get_alt_accounts(player)
 	return names
 end
 
+function xban.get_alt_accounts(player)
+	local e = xban.find_entry(player)
+	return xban.get_account_names(e)
+end
+
 function xban.get_record(player)
 	local e = xban.find_entry(player)
 	if not e then
@@ -408,6 +412,7 @@ minetest.register_chatcommand("xban_wl", {
 	end,
 })
 
+
 local function clean_db()
 	-- Removes old IP addresses for data protection and false positive
 	-- prevention
@@ -427,6 +432,7 @@ local function clean_db()
 	end
 	ACTION("Cleaned %d old IP addresses.", cleaned)
 end
+
 local function check_temp_bans()
 	minetest.after(60, check_temp_bans)
 	local to_rm = { }
@@ -492,6 +498,34 @@ local function load_db()
 	end
 end
 
+local function has_alt_accounts (e)
+	local a = xban.get_account_names(e)
+	return a and #a > 1
+end
+
+minetest.register_chatcommand("xban_cleanup", {
+	description = "Removes all uninteresting entries from the xban db",
+	privs = { server=true },
+	func = function(name, params)
+		local old_count = #db
+
+		local i = 1
+		while i <= #db do
+			if #db[i].record == 0 and not has_alt_accounts(db[i]) then
+				-- not banned, remove from db
+				table.remove(db, i)
+			else
+				-- banned, hold entry back
+				i = i + 1
+			end
+		end
+
+		-- save immediately
+		save_db()
+		return true, "Removed " .. (old_count - #db) .. " entries, new db entry-count: " .. #db
+	end,
+})
+
 minetest.register_on_shutdown(save_db)
 minetest.after(SAVE_INTERVAL, save_db)
 load_db()