Extract LastFm.API.Signature

lib/last_fm/api/signature.ex

@@ -0,0 +1,13 @@
+defmodule LastFm.API.Signature do
+  def generate(params, shared_secret) do
+    encoded_params =
+      params
+      # Params needs to be ASCII ordered alphabetically
+      |> Enum.sort()
+      |> Enum.map_join(fn {key, value} ->
+        "#{key}#{value}"
+      end)
+
+    :crypto.hash(:md5, encoded_params <> shared_secret) |> Base.encode16(case: :lower)
+  end
+end