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Robust user authentication solution

Security advisory: This version has known vulnerabilities. View advisories
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pow lib mix pow ecto migration.ex
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lib/mix/pow/ecto/migration.ex 

defmodule Mix.Pow.Ecto.Migration do

  @moduledoc """

  Utilities module for ecto migrations in mix tasks.

  """

  alias Mix.{Ecto, Generator}



  @doc """

  Creates a migration file for the repo.

  """

  @spec create_migration_files(atom(), binary(), binary()) :: any()

  def create_migration_files(repo, name, content) do

    base_name = "#{Macro.underscore(name)}.exs"

    path      =

      repo

      |> Ecto.source_repo_priv()

      |> Path.join("migrations")

      |> maybe_create_directory()

    timestamp = timestamp(path)



    path

    |> ensure_unique(base_name, name)

    |> Path.join("#{timestamp}_#{base_name}")

    |> Generator.create_file(content)

  end



  defp maybe_create_directory(path) do

    Generator.create_directory(path)



    path

  end



  defp ensure_unique(path, base_name, name) do

    path

    |> Path.join("*_#{base_name}")

    |> Path.wildcard()

    |> case do

      [] -> path

      _  -> Mix.raise("migration can't be created, there is already a migration file with name #{name}.")

    end

  end



  defp timestamp(path, seconds \\ 0) do

    timestamp = gen_timestamp(seconds)



    path

    |> Path.join("#{timestamp}_*.exs")

    |> Path.wildcard()

    |> case do

      [] -> timestamp

      _  -> timestamp(path, seconds + 1)

    end

  end



  defp gen_timestamp(seconds) do

    %{year: y, month: m, day: d, hour: hh, minute: mm, second: ss} =

      DateTime.utc_now()

      |> DateTime.to_unix()

      |> Kernel.+(seconds)

      |> DateTime.from_unix!()



    "#{y}#{pad(m)}#{pad(d)}#{pad(hh)}#{pad(mm)}#{pad(ss)}"

  end



  defp pad(i) when i < 10, do: <<?0, ?0 + i>>

  defp pad(i), do: to_string(i)

end