mix.exs

defmodule Authex.Mixfile do
  use Mix.Project

  def project do
    [app: :authex,
     version: "0.0.1",
     elixir: "~> 1.0",
     deps: deps]
  end

  # Configuration for the OTP application
  #
  # Type `mix help compile.app` for more information
  def application do
    [applications: [:logger, :bcrypt]]
  end

  # Dependencies can be Hex packages:
  #
  #   {:mydep, "~> 0.3.0"}
  #
  # Or git/path repositories:
  #
  #   {:mydep, git: "https://github.com/elixir-lang/mydep.git", tag: "0.1.0"}
  #
  # Type `mix help deps` for more examples and options
  defp deps do
    [
      {:ecto, "~> 0.2.5"},
      {:postgrex, "~> 0.6.0"},
      {:bcrypt, github: "smarkets/erlang-bcrypt", tag: "0.4.1"}
    ]
  end
end

repo.ex

defmodule AuthexTest.Repo do
  use Ecto.Repo, adapter: Ecto.Adapters.Postgres

  def conf do
    # The scheme can be anything, "ecto" is just an example
    parse_url "postgresql://docker:docker@localhost:5432/authex_development"
  end
end

user.ex

defmodule Authex.User do
  use Ecto.Model

  schema "users" do
    field :email
    field :encrypted_password
  end

  def authenticate!(email, password) do
    case find_by_email(email) do
      user = %Authex.User{} -> check_password(user, password)
      _ -> nil
    end
  end

  defp check_password(nil, _password), do: nil
  defp check_password(user = %Authex.User{encrypted_password: encrypted_password}, password_verify) do
    :bcrypt.start
    << salt :: binary-size(29), cipher :: binary-size(31)>> = encrypted_password
    verifier = :bcrypt.hashpw(password_verify, String.to_char_list(salt))
    IO.inspect verifier
    IO.inspect encrypted_password
    salt
    #IO.inspect password
  end

  defp find_by_email(email) do
    query = from u in Authex.User,
      where: downcase(u.email) == downcase("#{email}")
    hd AuthexTest.Repo.all(query)
  end
end