1 files changed, 56 insertions, 0 deletions
diff --git a/lib/pleroma/frontend.ex b/lib/pleroma/frontend.ex
new file mode 100644
index 000000000..646a0c806
--- /dev/null
+++ b/lib/pleroma/frontend.ex
@@ -0,0 +1,56 @@
+defmodule Pleroma.Frontend do
+  @type frontend_kind :: :primary
+
+  def get_config(frontend \\ :primary)
+
+  def get_config(:primary) do
+    primary_fe_config = Pleroma.Config.get([:frontends, :primary], %{"name" => "pleroma"})
+
+    {config, controller} =
+      if primary_fe_config["name"] == "none" do
+        {%{}, Pleroma.Web.Frontend.HeadlessController}
+      else
+        {primary_fe_config,
+         Module.concat([
+           Pleroma.Web.Frontend,
+           String.capitalize(primary_fe_config["name"]) <> "Controller"
+         ])}
+      end
+
+    %{"config" => config, "controller" => controller}
+  end
+
+  @spec file_path(String.t(), frontend_kind()) :: {:ok, String.t()} | {:error, String.t()}
+  def file_path(file, kind \\ :primary) do
+    config = get_config(kind)
+
+    instance_static_dir = Pleroma.Config.get([:instance, :static_dir], "instance/static")
+
+    frontend_path =
+      case config["config"] do
+        %{"name" => name, "ref" => ref} ->
+          Path.join([instance_static_dir, "frontends", name, ref, file])
+
+        _ ->
+          false
+      end
+
+    instance_path = Path.join([instance_static_dir, file])
+    priv_path = Application.app_dir(:pleroma, ["priv", "static", file])
+
+    cond do
+      File.exists?(instance_path) ->
+        {:ok, instance_path}
+
+      frontend_path && File.exists?(frontend_path) ->
+        {:ok, frontend_path}
+
+      File.exists?(priv_path) ->
+        {:ok, priv_path}
+
+      true ->
+        {:error,
+         "File #{file} not found in #{inspect([instance_path, frontend_path, priv_path])}"}
+    end
+  end
+end