module ActiveStorage class Service::Configurator #:nodoc: attr_reader :configurations def self.build(service_name, configurations) new(configurations).build(service_name) end def initialize(configurations) @configurations = configurations.deep_symbolize_keys end def build(service_name) config = config_for(service_name.to_sym) resolve(config.fetch(:service)).build(**config, configurator: self) end private def config_for(name) configurations.fetch name do raise "Missing configuration for the #{name.inspect} Active Storage service. Configurations available for #{configurations.keys.inspect}" end end def resolve(class_name) require "active_storage/service/#{class_name.to_s.underscore}_service" ActiveStorage::Service.const_get(:"#{class_name}Service") end end end