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Wechat API wrapper in Elixir.

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wechat lib wechat plugs check_url_signature.ex
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lib/wechat/plugs/check_url_signature.ex 

defmodule Wechat.Plugs.CheckUrlSignature do

  @moduledoc """

  Plug to check url signature.

  """



  import Plug.Conn

  import Wechat.Signature



  def init(opts) do

    Keyword.merge opts,

      token: Wechat.token

  end



  def call(conn = %Plug.Conn{params: params}, [token: token]) do

    %{"timestamp" => timestamp, "nonce" => nonce,

      "signature" => signature} = params

    my_signature = [token, timestamp, nonce] |> sign

    case my_signature == signature do

      true ->

        conn

      false ->

        conn

        |> send_resp(400, "")

        |> halt

    end

  end

end