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Simple parameters validation library

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talos lib types map_type.ex
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lib/types/map_type.ex 

defmodule Talos.Types.MapType do

  defstruct [:fields]



  @behaviour Talos.Types



  @default_options [optional: false, allow_nil: false]



  def valid?(%__MODULE__{fields: nil}, value) do

    is_map(value)

  end



  def valid?(%__MODULE__{fields: fields}, value) do

    is_map(value) &&

      Enum.all?(fields, fn field ->

        case field do

          {key, %{__struct__: type_module} = type} ->

            validation_check(type_module, type, value, key, @default_options)



          {key, %{__struct__: type_module} = type, options} ->

            validation_check(type_module, type, value, key, options)

        end

      end)

  end



  defp validation_check(module, type, map, key, options) do

    cond do

      options[:optional] && !Map.has_key?(map, key) -> true

      !options[:optional] && !Map.has_key?(map, key) -> false

      Map.has_key?(map, key) && options[:allow_nil] && is_nil(map[key]) -> true

      Map.has_key?(map, key) && !options[:allow_nil] && is_nil(map[key]) -> false

      true -> module.valid?(type, map[key])

    end

  end

end