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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.PollView do
   6   use Pleroma.Web, :view
   7
   8   alias Pleroma.Web.CommonAPI.Utils
   9
  10   def render("show.json", %{object: object, multiple: multiple, options: options} = params) do
  11     {end_time, expired} = end_time_and_expired(object)
  12     {options, votes_count} = options_and_votes_count(options)
  13
  14     poll = %{
  15       # Mastodon uses separate ids for polls, but an object can't have
  16       # more than one poll embedded so object id is fine
  17       id: to_string(object.id),
  18       expires_at: end_time,
  19       expired: expired,
  20       multiple: multiple,
  21       votes_count: votes_count,
  22       voters_count: voters_count(object),
  23       options: options,
  24       emojis: Pleroma.Web.MastodonAPI.StatusView.build_emojis(object.data["emoji"])
  25     }
  26
  27     if params[:for] do
  28       # when unauthenticated Mastodon doesn't include `voted` & `own_votes` keys in response
  29       {voted, own_votes} = voted_and_own_votes(params, options)
  30       Map.merge(poll, %{voted: voted, own_votes: own_votes})
  31     else
  32       poll
  33     end
  34   end
  35
  36   def render("show.json", %{object: object} = params) do
  37     case object.data do
  38       %{"anyOf" => [_ | _] = options} ->
  39         render(__MODULE__, "show.json", Map.merge(params, %{multiple: true, options: options}))
  40
  41       %{"oneOf" => [_ | _] = options} ->
  42         render(__MODULE__, "show.json", Map.merge(params, %{multiple: false, options: options}))
  43
  44       _ ->
  45         nil
  46     end
  47   end
  48
  49   defp end_time_and_expired(object) do
  50     if object.data["closed"] do
  51       end_time = NaiveDateTime.from_iso8601!(object.data["closed"])
  52       expired = NaiveDateTime.compare(end_time, NaiveDateTime.utc_now()) == :lt
  53
  54       {Utils.to_masto_date(end_time), expired}
  55     else
  56       {nil, false}
  57     end
  58   end
  59
  60   defp options_and_votes_count(options) do
  61     Enum.map_reduce(options, 0, fn %{"name" => name} = option, count ->
  62       current_count = option["replies"]["totalItems"] || 0
  63
  64       {%{
  65          title: name,
  66          votes_count: current_count
  67        }, current_count + count}
  68     end)
  69   end
  70
  71   defp voters_count(%{data: %{"voters" => voters}}) when is_list(voters) do
  72     length(voters)
  73   end
  74
  75   defp voters_count(_), do: 0
  76
  77   defp voted_and_own_votes(%{object: object} = params, options) do
  78     if params[:for] do
  79       existing_votes =
  80         Pleroma.Web.ActivityPub.Utils.get_existing_votes(params[:for].ap_id, object)
  81
  82       voted = existing_votes != [] or params[:for].ap_id == object.data["actor"]
  83
  84       own_votes =
  85         if voted do
  86           titles = Enum.map(options, & &1[:title])
  87
  88           Enum.reduce(existing_votes, [], fn vote, acc ->
  89             data = vote |> Map.get(:object) |> Map.get(:data)
  90             index = Enum.find_index(titles, &(&1 == data["name"]))
  91             [index | acc]
  92           end)
  93         else
  94           []
  95         end
  96
  97       {voted, own_votes}
  98     else
  99       {false, []}
 100     end
 101   end
 102 end