Add automatic auth.txt import upon auth table creation

auth_txt_import.lua

@@ -0,0 +1,40 @@
+local modname = minetest.get_current_modname()
+local modpath = minetest.get_modpath(modname) 
+
+local thismod = _G[modname]
+
+function thismod.import_auth_txt()
+  local auth_file_path = minetest.get_worldpath() .. '/auth.txt'
+  local create_auth_stmt = thismod.create_auth_stmt
+  local create_auth_params = thismod.create_auth_params
+  local file, errmsg = io.open(auth_file_path, 'rb')
+  if not file then
+    minetest.log("info", modname .. ": " .. auth_file_path .. " could not be opened for reading" ..
+       "(" .. errmsg .. "); no auth entries imported")
+    return
+  end
+  for line in file:lines() do
+    if line ~= "" then
+      local fields = line:split(":", true)
+      local name, password, privilege_string, last_login = unpack(fields)
+      last_login = tonumber(last_login)
+      if not (name and password and privilege_string) then
+        minetest.log('warning', modname .. ": Invalid line in auth.txt, skipped: " .. dump(line))
+      end
+      minetest.log('info', modname .. " importing player '"..name.."'")
+      create_auth_params:set(1, name)
+      create_auth_params:set(2, password)
+      create_auth_params:set(3, privilege_string)
+      create_auth_params:set(4, last_login)
+      local success, msg = pcall(create_auth_stmt.exec, create_auth_stmt)
+      if not success then
+        error(modname .. ": import failed: " .. msg)
+      end
+      if create_auth_stmt:affected_rows() ~= 1 then
+        error(modname .. ": create_auth failed: affected row count is " ..
+          create_auth_stmt:affected_rows() .. ", expected 1")
+      end
+    end
+  end
+  io.close(file)
+end

init.lua

@@ -88,6 +88,9 @@ do
           return nil
         end
         local parts = string_splitdots(name)
+        if not parts then
+          return cfg[name]
+        end
         local tbl = cfg[parts[1]]
         for n = 2, #parts do
           if tbl == nil then
@@ -100,7 +103,7 @@ do
     end
   end
 
-  local conn
+  local conn, dbname
   do
     -- MySQL API backend
     mysql.config(get('db.api'))
@@ -119,6 +122,7 @@ do
     connopts.options = connopts.options or {}
     connopts.options.MYSQL_OPT_RECONNECT = true
     conn = mysql.connect(connopts)
+    dbname = connopts.db
     thismod.conn = conn
 
     -- LuaPower's MySQL interface throws an error when the connection fails, no need to check if
@@ -180,6 +184,7 @@ do
     end
   end
 
+  local auth_table_created
   do -- Auth table existence check and setup
     conn:query("SHOW TABLES LIKE '" .. tables.auths.name .. "'")
     local res = conn:store_result()
@@ -197,6 +202,9 @@ do
         'PRIMARY KEY (' .. S.userid .. '),' ..
         'UNIQUE (' .. S.username .. ')' ..
       ')')
+      minetest.log('action', modname .. " created table '" .. dbname .. "." .. tables.auths.name ..
+        "'")
+      auth_table_created = true
     end
   end
 
@@ -245,6 +253,13 @@ do
     ',' .. S.lastlogin .. ' FROM ' .. tables.auths.name
   thismod.enumerate_auths_query = enumerate_auths_query
 
+  if auth_table_created and get('import_auth_txt_on_table_create') ~= 'false' then
+    if not thismod.import_auth_txt then
+      dofile(modpath .. '/auth_txt_import.lua')
+    end
+    thismod.import_auth_txt()
+  end
+
   thismod.auth_handler = {
     get_auth = function(name)
       assert(type(name) == 'string')