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Wechat API wrapper in Elixir.

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wechat lib wechat plugs request_validator.ex
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lib/wechat/plugs/request_validator.ex 

defmodule Wechat.Plugs.RequestValidator do

  @moduledoc false



  import Plug.Conn



  alias Wechat.Utils.SignatureVerifier



  def init(opts) do

    module = Keyword.fetch!(opts, :module)

    config = apply(module, :config, [])



    token = Keyword.fetch!(config, :token)

    %{token: token}

  end



  def call(conn, %{token: token}) do

    conn = fetch_query_params(conn)

    %{"timestamp" => timestamp, "nonce" => nonce, "signature" => signature} = conn.query_params



    if SignatureVerifier.verify?([token, timestamp, nonce], signature) do

      conn

    else

      conn |> send_resp(400, "") |> halt

    end

  end

end