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Wechat API wrapper in Elixir.

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wechat lib wechat utils signature_verifier.ex
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lib/wechat/utils/signature_verifier.ex 

defmodule Wechat.Utils.SignatureVerifier do

  @moduledoc """

  Verify wechat signature.

  """



  alias Plug.Crypto, as: PCryto



  def verify?(args, signature) do

    args

    |> sign

    |> PCryto.secure_compare(signature)

  end



  def sign(args) do

    args

    |> Enum.sort()

    |> Enum.join()

    |> sha1

  end



  defp sha1(str) do

    digest = :crypto.hash(:sha, str)

    Base.encode16(digest, case: :lower)

  end

end