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phoenix lib mix tasks phoenix.gen.secret.ex
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lib/mix/tasks/phoenix.gen.secret.ex 

defmodule Mix.Tasks.Phoenix.Gen.Secret do

  use Mix.Task



  @shortdoc "Generates a secret"



  @moduledoc """

  Generates a secret and print it to the terminal.



      mix phoenix.gen.secret [length]



  By default, mix phoenix.gen.secret generates a key 64 characters long.



  The minimum value for `length` is 32.

  """

  def run([]),    do: run(["64"])

  def run([int]), do: int |> parse! |> random_string |> Mix.shell.info

  def run([_|_]), do: invalid_args!()



  defp parse!(int) do

    case Integer.parse(int) do

      {int, ""} -> int

      _ -> invalid_args!()

    end

  end



  defp random_string(length) when length > 31 do

    :crypto.strong_rand_bytes(length) |> Base.encode64 |> binary_part(0, length)

  end

  defp random_string(_), do: Mix.raise "The secret should be at least 32 characters long"



  @spec invalid_args!() :: no_return()

  defp invalid_args! do

    Mix.raise "mix phoenix.gen.secret expects a length as integer or no argument at all"

  end

end