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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.Web.OStatus.FollowHandler do
   6   alias Pleroma.Web.XML
   7   alias Pleroma.Web.OStatus
   8   alias Pleroma.Web.ActivityPub.ActivityPub
   9   alias Pleroma.User
  10
  11   def handle(entry, doc) do
  12     with {:ok, actor} <- OStatus.find_make_or_update_user(doc),
  13          id when not is_nil(id) <- XML.string_from_xpath("/entry/id", entry),
  14          followed_uri when not is_nil(followed_uri) <-
  15            XML.string_from_xpath("/entry/activity:object/id", entry),
  16          {:ok, followed} <- OStatus.find_or_make_user(followed_uri),
  17          {:ok, activity} <- ActivityPub.follow(actor, followed, id, false) do
  18       User.follow(actor, followed)
  19       {:ok, activity}
  20     end
  21   end
  22 end