ActivityPub MRF: implement the SimplePolicy policy

[akkoma] / lib / pleroma / plugs / http_signature.ex

diff --git a/lib/pleroma/plugs/http_signature.ex b/lib/pleroma/plugs/http_signature.ex
index 9236c501c39c46c8028b27a3c2be3da09a8c6041..8b9ccdd2d7c3be5f9a0ae38d3c1a436f66586cbd 100644 (file)
--- a/lib/pleroma/plugs/http_signature.ex
+++ b/lib/pleroma/plugs/http_signature.ex
@@ -14,14 +14,26 @@ defmodule Pleroma.Web.Plugs.HTTPSignaturePlug do
   def call(conn, opts) do
     user = conn.params["actor"]
     Logger.debug("Checking sig for #{user}")
-    if get_req_header(conn, "signature") do
-      conn = conn
-      |> put_req_header("(request-target)", String.downcase("#{conn.method} #{conn.request_path}"))
+    [signature | _] = get_req_header(conn, "signature")
 
-      assign(conn, :valid_signature, HTTPSignatures.validate_conn(conn))
-    else
-      Logger.debug("No signature header!")
-      conn
+    cond do
+      signature && String.contains?(signature, user) ->
+        conn =
+          conn
+          |> put_req_header(
+            "(request-target)",
+            String.downcase("#{conn.method}") <> " #{conn.request_path}"
+          )
+
+        assign(conn, :valid_signature, HTTPSignatures.validate_conn(conn))
+
+      signature ->
+        Logger.debug("Signature not from actor")
+        assign(conn, :valid_signature, false)
+
+      true ->
+        Logger.debug("No signature header!")
+        conn
     end
   end
 end