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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.Web.MastodonAPI.ConversationView do
   6   use Pleroma.Web, :view
   7
   8   alias Pleroma.Activity
   9   alias Pleroma.Repo
  10   alias Pleroma.Web.ActivityPub.ActivityPub
  11   alias Pleroma.Web.MastodonAPI.AccountView
  12   alias Pleroma.Web.MastodonAPI.StatusView
  13
  14   def render("participations.json", %{participations: participations, for: user}) do
  15     safe_render_many(participations, __MODULE__, "participation.json", %{
  16       as: :participation,
  17       for: user
  18     })
  19   end
  20
  21   def render("participation.json", %{participation: participation, for: user}) do
  22     participation = Repo.preload(participation, conversation: [], recipients: [])
  23
  24     last_activity_id =
  25       with nil <- participation.last_activity_id do
  26         ActivityPub.fetch_latest_direct_activity_id_for_context(
  27           participation.conversation.ap_id,
  28           %{
  29             user: user,
  30             blocking_user: user
  31           }
  32         )
  33       end
  34
  35     activity = Activity.get_by_id_with_object(last_activity_id)
  36
  37     # Conversations return all users except the current user,
  38     # except when the current user is the only participant
  39     users =
  40       if length(participation.recipients) > 1 do
  41         Enum.reject(participation.recipients, &(&1.id == user.id))
  42       else
  43         participation.recipients
  44       end
  45
  46     %{
  47       id: participation.id |> to_string(),
  48       accounts: render(AccountView, "index.json", users: users, for: user),
  49       unread: !participation.read,
  50       last_status:
  51         render(StatusView, "show.json",
  52           activity: activity,
  53           direct_conversation_id: participation.id,
  54           for: user
  55         )
  56     }
  57   end
  58 end