Remove 'Date' header

Author: Bruno Dusausoy

lib/ibanity/signature.ex

@@ -9,12 +9,10 @@ defmodule Ibanity.Signature do
 
   def signature_headers(%HttpRequest{} = request, method, private_key, certificate_id) do
     parsed_uri = URI.parse(request.uri)
-    date = now_to_string()
 
     headers = [
-      Date: date,
       Digest: "SHA-512=" <> payload_digest(request),
-      Signature: generate_signature(request, method, parsed_uri, private_key, certificate_id, date)
+      Signature: generate_signature(request, method, parsed_uri, private_key, certificate_id)
     ]
 
     {:ok, headers}
@@ -39,8 +37,8 @@ defmodule Ibanity.Signature do
     |> sha512sum()
   end
 
-  defp generate_signature(request, method, uri, private_key, certificate_id, date) do
-    headers = signing_headers(request, method, uri, date)
+  defp generate_signature(request, method, uri, private_key, certificate_id) do
+    headers = signing_headers(request, method, uri)
     timestamp = DateTime.to_unix(DateTime.utc_now())
     signing_headers = headers |> Keyword.keys() |> Enum.join(" ")
     signature = headers |> Enum.join("\n") |> sign(private_key) |> Base.url_encode64()
@@ -51,15 +49,14 @@ defmodule Ibanity.Signature do
       ~s/algorithm="#{@algorithm}"/,
       ~s/headers="#{signing_headers}"/,
       ~s/signature="#{signature}"/,
-    ] |> Enum.join(", ")
+    ] |> Enum.join(",")
   end
 
-  defp signing_headers(request, method, uri, date) do
+  defp signing_headers(request, method, uri) do
     []
     |> add_virtual_header(request, method, uri)
     |> add_host(request, method, uri)
     |> add_digest(request, method, uri)
-    |> add_date(date)
     |> add_ibanity_headers(request, method, uri)
     |> add_authorization(request, method, uri)
     |> Enum.reverse()
@@ -83,10 +80,6 @@ defmodule Ibanity.Signature do
     Keyword.put_new(headers, :digest, "SHA-512=" <> payload_digest(request))
   end
 
-  defp add_date(headers, date) do
-    Keyword.put_new(headers, :date, date)
-  end
-
   defp add_ibanity_headers(headers, request, _method, _uri) do
     ibanity_header? = fn {header, _} ->
       header
@@ -112,12 +105,6 @@ defmodule Ibanity.Signature do
       headers
     end
   end
-
-  defp now_to_string do
-    DateTime.utc_now()
-    |> DateTime.truncate(:second)
-    |> DateTime.to_iso8601()
-  end
 end
 
 defimpl String.Chars, for: Tuple do