1 files changed, 53 insertions, 0 deletions
diff --git a/lib/pleroma/web/plugs/instance_static.ex b/lib/pleroma/web/plugs/instance_static.ex
new file mode 100644
index 000000000..54b9175df
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+++ b/lib/pleroma/web/plugs/instance_static.ex
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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Web.Plugs.InstanceStatic do
+  require Pleroma.Constants
+
+  @moduledoc """
+  This is a shim to call `Plug.Static` but with runtime `from` configuration.
+
+  Mountpoints are defined directly in the module to avoid calling the configuration for every request including non-static ones.
+  """
+  @behaviour Plug
+
+  def file_path(path) do
+    instance_path =
+      Path.join(Pleroma.Config.get([:instance, :static_dir], "instance/static/"), path)
+
+    frontend_path = Pleroma.Web.Plugs.FrontendStatic.file_path(path, :primary)
+
+    (File.exists?(instance_path) && instance_path) ||
+      (frontend_path && File.exists?(frontend_path) && frontend_path) ||
+      Path.join(Application.app_dir(:pleroma, "priv/static/"), path)
+  end
+
+  def init(opts) do
+    opts
+    |> Keyword.put(:from, "__unconfigured_instance_static_plug")
+    |> Plug.Static.init()
+  end
+
+  for only <- Pleroma.Constants.static_only_files() do
+    def call(%{request_path: "/" <> unquote(only) <> _} = conn, opts) do
+      call_static(
+        conn,
+        opts,
+        Pleroma.Config.get([:instance, :static_dir], "instance/static")
+      )
+    end
+  end
+
+  def call(conn, _) do
+    conn
+  end
+
+  defp call_static(conn, opts, from) do
+    opts =
+      opts
+      |> Map.put(:from, from)
+
+    Plug.Static.call(conn, opts)
+  end
+end