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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.ActivityPub.Visibility do
   6   alias Pleroma.Activity
   7   alias Pleroma.Object
   8   alias Pleroma.Repo
   9   alias Pleroma.User
  10   alias Pleroma.Web.ActivityPub.Utils
  11
  12   require Pleroma.Constants
  13
  14   @spec is_public?(Object.t() | Activity.t() | map()) :: boolean()
  15   def is_public?(%Object{data: %{"type" => "Tombstone"}}), do: false
  16   def is_public?(%Object{data: data}), do: is_public?(data)
  17   def is_public?(%Activity{data: %{"type" => "Move"}}), do: true
  18   def is_public?(%Activity{data: data}), do: is_public?(data)
  19   def is_public?(%{"directMessage" => true}), do: false
  20
  21   def is_public?(data) do
  22     Utils.label_in_message?(Pleroma.Constants.as_public(), data) or
  23       Utils.label_in_message?(Utils.as_local_public(), data)
  24   end
  25
  26   def is_local_public?(%Object{data: data}), do: is_local_public?(data)
  27   def is_local_public?(%Activity{data: data}), do: is_local_public?(data)
  28
  29   def is_local_public?(data) do
  30     Utils.label_in_message?(Utils.as_local_public(), data) and
  31       not Utils.label_in_message?(Pleroma.Constants.as_public(), data)
  32   end
  33
  34   def is_private?(activity) do
  35     with false <- is_public?(activity),
  36          %User{follower_address: follower_address} <-
  37            User.get_cached_by_ap_id(activity.data["actor"]) do
  38       follower_address in activity.data["to"]
  39     else
  40       _ -> false
  41     end
  42   end
  43
  44   def is_announceable?(activity, user, public \\ true) do
  45     is_public?(activity) ||
  46       (!public && is_private?(activity) && activity.data["actor"] == user.ap_id)
  47   end
  48
  49   def is_direct?(%Activity{data: %{"directMessage" => true}}), do: true
  50   def is_direct?(%Object{data: %{"directMessage" => true}}), do: true
  51
  52   def is_direct?(activity) do
  53     !is_public?(activity) && !is_private?(activity)
  54   end
  55
  56   def is_list?(%{data: %{"listMessage" => _}}), do: true
  57   def is_list?(_), do: false
  58
  59   @spec visible_for_user?(Object.t() | Activity.t() | nil, User.t() | nil) :: boolean()
  60   def visible_for_user?(%Object{data: %{"type" => "Tombstone"}}, _), do: false
  61   def visible_for_user?(%Activity{actor: ap_id}, %User{ap_id: ap_id}), do: true
  62   def visible_for_user?(%Object{data: %{"actor" => ap_id}}, %User{ap_id: ap_id}), do: true
  63   def visible_for_user?(nil, _), do: false
  64   def visible_for_user?(%Activity{data: %{"listMessage" => _}}, nil), do: false
  65
  66   def visible_for_user?(
  67         %Activity{data: %{"listMessage" => list_ap_id}} = activity,
  68         %User{} = user
  69       ) do
  70     user.ap_id in activity.data["to"] ||
  71       list_ap_id
  72       |> Pleroma.List.get_by_ap_id()
  73       |> Pleroma.List.member?(user)
  74   end
  75
  76   def visible_for_user?(%{__struct__: module} = message, nil)
  77       when module in [Activity, Object] do
  78     if restrict_unauthenticated_access?(message),
  79       do: false,
  80       else: is_public?(message) and not is_local_public?(message)
  81   end
  82
  83   def visible_for_user?(%{__struct__: module} = message, user)
  84       when module in [Activity, Object] do
  85     x = [user.ap_id | User.following(user)]
  86     y = [message.data["actor"]] ++ message.data["to"] ++ (message.data["cc"] || [])
  87
  88     user_is_local = user.local
  89     federatable = not is_local_public?(message)
  90     (is_public?(message) || Enum.any?(x, &(&1 in y))) and (user_is_local || federatable)
  91   end
  92
  93   def entire_thread_visible_for_user?(%Activity{} = activity, %User{} = user) do
  94     {:ok, %{rows: [[result]]}} =
  95       Ecto.Adapters.SQL.query(Repo, "SELECT thread_visibility($1, $2)", [
  96         user.ap_id,
  97         activity.data["id"]
  98       ])
  99
 100     result
 101   end
 102
 103   def restrict_unauthenticated_access?(%Activity{local: local}) do
 104     restrict_unauthenticated_access_to_activity?(local)
 105   end
 106
 107   def restrict_unauthenticated_access?(%Object{} = object) do
 108     object
 109     |> Object.local?()
 110     |> restrict_unauthenticated_access_to_activity?()
 111   end
 112
 113   def restrict_unauthenticated_access?(%User{} = user) do
 114     User.visible_for(user, _reading_user = nil)
 115   end
 116
 117   defp restrict_unauthenticated_access_to_activity?(local?) when is_boolean(local?) do
 118     cfg_key = if local?, do: :local, else: :remote
 119
 120     Pleroma.Config.restrict_unauthenticated_access?(:activities, cfg_key)
 121   end
 122
 123   def get_visibility(object) do
 124     to = object.data["to"] || []
 125     cc = object.data["cc"] || []
 126
 127     cond do
 128       Pleroma.Constants.as_public() in to ->
 129         "public"
 130
 131       Pleroma.Constants.as_public() in cc ->
 132         "unlisted"
 133
 134       Utils.as_local_public() in to ->
 135         "local"
 136
 137       # this should use the sql for the object's activity
 138       Enum.any?(to, &String.contains?(&1, "/followers")) ->
 139         "private"
 140
 141       object.data["directMessage"] == true ->
 142         "direct"
 143
 144       is_binary(object.data["listMessage"]) ->
 145         "list"
 146
 147       length(cc) > 0 ->
 148         "private"
 149
 150       true ->
 151         "direct"
 152     end
 153   end
 154 end