Preserve parameters in link headers (Mastodon API)

lib/pleroma/web/mastodon_api/mastodon_api_controller.ex

@@ -190,6 +190,11 @@ def custom_emojis(conn, _params) do
   end
 
   defp add_link_headers(conn, method, activities, param \\ nil, params \\ %{}) do
+    params =
+      conn.params
+      |> Map.drop(["since_id", "max_id"])
+      |> Map.merge(params)
+
     last = List.last(activities)
     first = List.first(activities)
 

test/web/mastodon_api/mastodon_api_controller_test.exs

@@ -1955,4 +1955,36 @@ test "comment must be up to the size specified in the config", %{
                |> json_response(400)
     end
   end
+
+  describe "link headers" do
+    test "preserves parameters in link headers", %{conn: conn} do
+      user = insert(:user)
+      other_user = insert(:user)
+
+      {:ok, activity1} =
+        CommonAPI.post(other_user, %{
+          "status" => "hi @#{user.nickname}",
+          "visibility" => "public"
+        })
+
+      {:ok, activity2} =
+        CommonAPI.post(other_user, %{
+          "status" => "hi @#{user.nickname}",
+          "visibility" => "public"
+        })
+
+      notification1 = Repo.get_by(Notification, activity_id: activity1.id)
+      notification2 = Repo.get_by(Notification, activity_id: activity2.id)
+
+      conn =
+        conn
+        |> assign(:user, user)
+        |> get("/api/v1/notifications", %{media_only: true})
+
+      assert [link_header] = get_resp_header(conn, "link")
+      assert link_header =~ ~r/media_only=true/
+      assert link_header =~ ~r/since_id=#{notification2.id}/
+      assert link_header =~ ~r/max_id=#{notification1.id}/
+    end
+  end
 end