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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.Instances do
   6   @moduledoc "Instances context."
   7
   8   @adapter Pleroma.Instances.Instance
   9
  10   defdelegate filter_reachable(urls_or_hosts), to: @adapter
  11   defdelegate reachable?(url_or_host), to: @adapter
  12   defdelegate set_reachable(url_or_host), to: @adapter
  13   defdelegate set_unreachable(url_or_host, unreachable_since \\ nil), to: @adapter
  14   defdelegate get_consistently_unreachable(), to: @adapter
  15
  16   def set_consistently_unreachable(url_or_host),
  17     do: set_unreachable(url_or_host, reachability_datetime_threshold())
  18
  19   def reachability_datetime_threshold do
  20     federation_reachability_timeout_days =
  21       Pleroma.Config.get([:instance, :federation_reachability_timeout_days], 0)
  22
  23     if federation_reachability_timeout_days > 0 do
  24       NaiveDateTime.add(
  25         NaiveDateTime.utc_now(),
  26         -federation_reachability_timeout_days * 24 * 3600,
  27         :second
  28       )
  29     else
  30       ~N[0000-01-01 00:00:00]
  31     end
  32   end
  33
  34   def host(url_or_host) when is_binary(url_or_host) do
  35     if url_or_host =~ ~r/^http/i do
  36       URI.parse(url_or_host).host
  37     else
  38       url_or_host
  39     end
  40   end
  41 end