FrontendStatic: Add plug to serve frontends based on configuration.

test/plugs/frontend_static_test.exs

@@ -0,0 +1,30 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.FrontendStaticPlugTest do
+  use Pleroma.Web.ConnCase
+
+  @dir "test/tmp/instance_static"
+
+  setup do
+    File.mkdir_p!(@dir)
+    on_exit(fn -> File.rm_rf(@dir) end)
+  end
+
+  setup do: clear_config([:instance, :static_dir], @dir)
+
+  test "overrides existing static files", %{conn: conn} do
+    name = "pelmora"
+    ref = "uguu"
+
+    clear_config([:frontends, :primary], %{"name" => name, "ref" => ref})
+    path = "#{@dir}/frontends/#{name}/#{ref}"
+
+    File.mkdir_p!(path)
+    File.write!("#{path}/index.html", "from frontend plug")
+
+    index = get(conn, "/")
+    assert html_response(index, 200) == "from frontend plug"
+  end
+end