Fix

lib/nulla/http_signature.ex

@@ -7,12 +7,11 @@ defmodule Nulla.HTTPSignature do
     date = DateTime.utc_now() |> Calendar.strftime("%a, %d %b %Y %H:%M:%S GMT")
     uri = URI.parse(inbox_url)
 
-    signature_string = """
-    (request-target): post #{uri.path}
-    host: #{uri.host}
-    date: #{date}
-    digest: #{digest}
-    """
+    signature_string =
+      "(request-target): post #{uri.path}\n" <>
+        "host: #{uri.host}\n" <>
+        "date: #{date}\n" <>
+        "digest: #{digest}"
 
     user = User.get_user(id: actor.id)
 
@@ -56,13 +55,16 @@ defmodule Nulla.HTTPSignature do
   end
 
   defp parse_signature_header(header) do
+    header =
+      header
+      |> String.split(",")
+      |> Enum.map(fn pair ->
+        [k, v] = String.split(pair, "=", parts: 2)
+        {String.trim(k), String.trim(v, ~s("))}
+      end)
+      |> Enum.into(%{})
+
     header
-    |> String.split(",")
-    |> Enum.map(fn pair ->
-      [k, v] = String.split(pair, "=", parts: 2)
-      {String.trim(k), String.trim(v, ~s("))}
-    end)
-    |> Enum.into(%{})
   end
 
   defp build_signature_string(nil, _conn), do: {:error, :missing_headers}
@@ -83,6 +85,9 @@ defmodule Nulla.HTTPSignature do
 
               "(request-target): #{method} #{path}"
 
+            "host" ->
+              "host: #{conn.host}"
+
             _ ->
               value = get_req_header(conn, header) |> List.first()
               if value, do: "#{header}: #{value}", else: nil