block introspection by

introspect_blocker.ex

defmodule GraphqlService.Schema.IntrospectBlocker do
  # by https://github.com/sb8244
  @behaviour Absinthe.Middleware

  def call(resolution, _config) do
    case Absinthe.Resolution.path(resolution) |> IO.inspect do
      ["__schema" | _] ->
        %{resolution | errors: ["__schema introspection is disabled"] }

      ["__type" | _] ->
        %{resolution | errors: ["__type introspection is disabled"] }

      _ ->
        resolution
    end
  end
end