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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.HTTP.AdapterHelper do
   6   alias Pleroma.HTTP.Connection
   7
   8   @type proxy ::
   9           {Connection.host(), pos_integer()}
  10           | {Connection.proxy_type(), Connection.host(), pos_integer()}
  11
  12   @callback options(keyword(), URI.t()) :: keyword()
  13   @callback after_request(keyword()) :: :ok
  14
  15   @spec options(keyword(), URI.t()) :: keyword()
  16   def options(opts, _uri) do
  17     proxy = Pleroma.Config.get([:http, :proxy_url], nil)
  18     maybe_add_proxy(opts, format_proxy(proxy))
  19   end
  20
  21   @spec maybe_get_conn(URI.t(), keyword()) :: keyword()
  22   def maybe_get_conn(_uri, opts), do: opts
  23
  24   @spec after_request(keyword()) :: :ok
  25   def after_request(_opts), do: :ok
  26
  27   @spec format_proxy(String.t() | tuple() | nil) :: proxy() | nil
  28   def format_proxy(nil), do: nil
  29
  30   def format_proxy(proxy_url) do
  31     case Connection.parse_proxy(proxy_url) do
  32       {:ok, host, port} -> {host, port}
  33       {:ok, type, host, port} -> {type, host, port}
  34       _ -> nil
  35     end
  36   end
  37
  38   @spec maybe_add_proxy(keyword(), proxy() | nil) :: keyword()
  39   def maybe_add_proxy(opts, nil), do: opts
  40   def maybe_add_proxy(opts, proxy), do: Keyword.put_new(opts, :proxy, proxy)
  41 end