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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2019 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
  15   def set_consistently_unreachable(url_or_host),
  16     do: set_unreachable(url_or_host, reachability_datetime_threshold())
  17
  18   def reachability_datetime_threshold do
  19     federation_reachability_timeout_days =
  20       Pleroma.Config.get([:instance, :federation_reachability_timeout_days], 0)
  21
  22     if federation_reachability_timeout_days > 0 do
  23       NaiveDateTime.add(
  24         NaiveDateTime.utc_now(),
  25         -federation_reachability_timeout_days * 24 * 3600,
  26         :second
  27       )
  28     else
  29       ~N[0000-01-01 00:00:00]
  30     end
  31   end
  32
  33   def host(url_or_host) when is_binary(url_or_host) do
  34     if url_or_host =~ ~r/^http/i do
  35       URI.parse(url_or_host).host
  36     else
  37       url_or_host
  38     end
  39   end
  40 end