loader.ex
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loader.ex
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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.Config.Loader do
	@reject_keys [
	Pleroma.Repo,
	Pleroma.Web.Endpoint,
	:env,
	:configurable_from_database,
	:database,
	:swarm
	]

	@reject_groups [
	:postgrex,
	:tesla
	]

	if Code.ensure_loaded?(Config.Reader) do
	@reader Config.Reader

	def read(path), do: @reader.read!(path)
	else
	# support for Elixir less than 1.9
	@reader Mix.Config
	def read(path) do
	path
	\|> @reader.eval!()
	\|> elem(0)
	end
	end

	@spec read(Path.t()) :: keyword()

	@spec merge(keyword(), keyword()) :: keyword()
	def merge(c1, c2), do: @reader.merge(c1, c2)

	@spec default_config() :: keyword()
	def default_config do
	"config/config.exs"
	\|> read()
	\|> filter()
	end

	defp filter(configs) do
	configs
	\|> Keyword.keys()
	\|> Enum.reduce([], &Keyword.put(&2, &1, filter_group(&1, configs)))
	end

	@spec filter_group(atom(), keyword()) :: keyword()
	def filter_group(group, configs) do
	Enum.reject(configs[group], fn {key, _v} ->
	key in @reject_keys or group in @reject_groups or
	(group == :phoenix and key == :serve_endpoints)
	end)
	end
	end