postland/lib/postland.ex

defmodule Postland do
  @moduledoc """
  Postland keeps the contexts that define your domain
  and business logic.

  Contexts are also responsible for managing your data, regardless
  if it comes from the database, an external API or others.
  """

  alias Postland.Accounts

  def temporary_password() do
    :crypto.strong_rand_bytes(12) |> Base.encode64()
  end

  def generate_keys(bits \\ 4096) do
    {:RSAPrivateKey, _, modulus, publicExponent, _, _, _, _exponent1, _, _, _otherPrimeInfos} =
      rsa_private_key = :public_key.generate_key({:rsa, bits, 65537})

    rsa_public_key = {:RSAPublicKey, modulus, publicExponent}

    pem_entry = :public_key.pem_entry_encode(:RSAPrivateKey, rsa_private_key)
    private_key = :public_key.pem_encode([pem_entry])

    pem_entry = :public_key.pem_entry_encode(:SubjectPublicKeyInfo, rsa_public_key)
    public_key = :public_key.pem_encode([pem_entry])

    %{public: public_key, private: private_key}
  end

  def on_boot_setup() do
    if !setup?() do
      # TODO: Require the DB have restrictive permissions
      %{public: public_key, private: private_key} = generate_keys()

      attrs = %{
        username: "welcome",
        password: temporary_password(),
        private_key: private_key,
        public_key: public_key
      }

      {:ok, _user} = Accounts.register_user(attrs)

      IO.puts(
        "Your temporary username is #{attrs.username} and your temporary password is #{attrs.password}"
      )
    end
  end

  def setup?() do
    Accounts.solo_user() != nil
  end
end