This plugin will check for the existence of a file to determine if the server is in maintenance mode or not. This file needs to be a text file that contains comma separated list of IP addresses or subnet masks.
The maintenanceModePlugin() function accepts the path to the file that contains the list of IP addresses.
NODE_ENV will bypass maintenance mode when it is set to NODE_ENV=true in the .env file.
The maintenanceModePlugin function needs to the createYoga function in the the plugins array. The file containing the list of IP addresses or subnet masks will be created and deleted with and API exposed by API Gateway.