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# Pleroma: A lightweight social networking server
# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.Plugs.FrontendStatic do
require Pleroma.Constants
@moduledoc """
This is a shim to call `Plug.Static` but with runtime `from` configuration`. It dispatches to the different frontends.
"""
@behaviour Plug
@api_routes Pleroma.Web.get_api_routes()
def file_path(path, frontend_type \\ :primary) do
if configuration = Pleroma.Config.get([:frontends, frontend_type]) do
instance_static_path = Pleroma.Config.get([:instance, :static_dir], "instance/static")
Path.join([
instance_static_path,
"frontends",
configuration["name"],
configuration["ref"],
path
])
else
nil
end
end
def init(opts) do
opts
|> Keyword.put(:from, "__unconfigured_frontend_static_plug")
|> Plug.Static.init()
|> Map.put(:frontend_type, opts[:frontend_type])
end
def call(conn, opts) do
with false <- api_route?(conn.path_info),
false <- invalid_path?(conn.path_info),
frontend_type <- Map.get(opts, :frontend_type, :primary),
path when not is_nil(path) <- file_path("", frontend_type) do
call_static(conn, opts, path)
else
_ ->
conn
end
end
defp invalid_path?(list) do
invalid_path?(list, :binary.compile_pattern(["/", "\\", ":", "\0"]))
end
defp invalid_path?([h | _], _match) when h in [".", "..", ""], do: true
defp invalid_path?([h | t], match), do: String.contains?(h, match) or invalid_path?(t)
defp invalid_path?([], _match), do: false
defp api_route?(list) when is_list(list) and length(list) > 0 do
List.first(list) in @api_routes
end
defp api_route?(_), do: false
defp call_static(conn, opts, from) do
opts = Map.put(opts, :from, from)
Plug.Static.call(conn, opts)
end
end
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