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Robust user authentication solution

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

defmodule Mix.Tasks.Pow.Ecto.MigrationUtils do

  @moduledoc """

  Utilities module for ecto migrations in mix tasks.

  """

  alias Mix.{Ecto, Generator}



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

  def create_migration_files(repo, name, content) do

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

    timestamp    = timestamp()



    repo

    |> Ecto.source_repo_priv()

    |> Path.join("migrations")

    |> maybe_create_directory()

    |> 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 do

    {{y, m, d}, {hh, mm, ss}} = :calendar.universal_time()

    "#{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