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A sandbox for Elixir to safely evaluate untrusted code from user input

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dune lib dune shims io.ex
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lib/dune/shims/io.ex 

defmodule Dune.Shims.IO do

  @moduledoc false



  alias Dune.{Failure, Shims}



  def puts(env, device \\ :stdio, item)



  def puts(env, :stdio, item) do

    env

    |> Shims.Kernel.safe_to_string(item)

    |> then(&IO.puts(:stdio, &1))

  end



  def puts(_env, _device, _item) do

    error = Failure.restricted_function(IO, :puts, 2)

    throw(error)

  end



  def inspect(env, item, opts \\ []) do

    inspect(env, :stdio, item, opts)

  end



  def inspect(env, :stdio, item, opts) when is_list(opts) do

    inspected = Shims.Kernel.safe_inspect(env, item, opts)



    chardata =

      if label_opt = opts[:label] do

        [Shims.Kernel.safe_to_string(env, label_opt), ": ", inspected]

      else

        inspected

      end



    IO.puts(:stdio, chardata)



    item

  end



  def inspect(_env, _device, _item, opts) when is_list(opts) do

    error = Failure.restricted_function(IO, :inspect, 3)

    throw(error)

  end

end