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exop

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A library that provides a few macros which allow you to encapsulate business logic and validate incoming params over predefined contract.

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exop lib exop policy.ex
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lib/exop/policy.ex 

defmodule Exop.Policy do

  @type t :: __MODULE__



  @callback authorize(atom, any, Keyword.t) :: true | false



  defmacro __using__(_opts) do

    quote do

      @behaviour unquote(__MODULE__)

      import unquote(__MODULE__)

      @before_compile unquote(__MODULE__)

    end

  end



  defmacro __before_compile__(_env) do

    quote do

      @doc "authorizes `user` possibility to invoke an `action`"

      @spec authorize(atom, any, Keyword.t) :: true | false

      def authorize(action, user, opts \\ []) do

        apply(__MODULE__, action, [user, opts]) == true

      end      

    end

  end

end