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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.Notification do
   6   use Ecto.Schema
   7
   8   alias Pleroma.Activity
   9   alias Pleroma.Notification
  10   alias Pleroma.Object
  11   alias Pleroma.Pagination
  12   alias Pleroma.Repo
  13   alias Pleroma.ThreadMute
  14   alias Pleroma.User
  15   alias Pleroma.Web.CommonAPI.Utils
  16   alias Pleroma.Web.Push
  17   alias Pleroma.Web.Streamer
  18
  19   import Ecto.Query
  20   import Ecto.Changeset
  21
  22   require Logger
  23
  24   @type t :: %__MODULE__{}
  25
  26   @include_muted_option :with_muted
  27
  28   schema "notifications" do
  29     field(:seen, :boolean, default: false)
  30     belongs_to(:user, User, type: FlakeId.Ecto.CompatType)
  31     belongs_to(:activity, Activity, type: FlakeId.Ecto.CompatType)
  32
  33     timestamps()
  34   end
  35
  36   def changeset(%Notification{} = notification, attrs) do
  37     notification
  38     |> cast(attrs, [:seen])
  39   end
  40
  41   defp for_user_query_ap_id_opts(user, opts) do
  42     ap_id_relationships =
  43       [:block] ++
  44         if opts[@include_muted_option], do: [], else: [:notification_mute]
  45
  46     preloaded_ap_ids = User.outgoing_relationships_ap_ids(user, ap_id_relationships)
  47
  48     exclude_blocked_opts = Map.merge(%{blocked_users_ap_ids: preloaded_ap_ids[:block]}, opts)
  49
  50     exclude_notification_muted_opts =
  51       Map.merge(%{notification_muted_users_ap_ids: preloaded_ap_ids[:notification_mute]}, opts)
  52
  53     {exclude_blocked_opts, exclude_notification_muted_opts}
  54   end
  55
  56   def for_user_query(user, opts \\ %{}) do
  57     {exclude_blocked_opts, exclude_notification_muted_opts} =
  58       for_user_query_ap_id_opts(user, opts)
  59
  60     Notification
  61     |> where(user_id: ^user.id)
  62     |> where(
  63       [n, a],
  64       fragment(
  65         "? not in (SELECT ap_id FROM users WHERE deactivated = 'true')",
  66         a.actor
  67       )
  68     )
  69     |> join(:inner, [n], activity in assoc(n, :activity))
  70     |> join(:left, [n, a], object in Object,
  71       on:
  72         fragment(
  73           "(?->>'id') = COALESCE((? -> 'object'::text) ->> 'id'::text)",
  74           object.data,
  75           a.data
  76         )
  77     )
  78     |> preload([n, a, o], activity: {a, object: o})
  79     |> exclude_notification_muted(user, exclude_notification_muted_opts)
  80     |> exclude_blocked(user, exclude_blocked_opts)
  81     |> exclude_visibility(opts)
  82     |> exclude_move(opts)
  83   end
  84
  85   defp exclude_blocked(query, user, opts) do
  86     blocked_ap_ids = opts[:blocked_users_ap_ids] || User.blocked_users_ap_ids(user)
  87
  88     query
  89     |> where([n, a], a.actor not in ^blocked_ap_ids)
  90     |> where(
  91       [n, a],
  92       fragment("substring(? from '.*://([^/]*)')", a.actor) not in ^user.domain_blocks
  93     )
  94   end
  95
  96   defp exclude_notification_muted(query, _, %{@include_muted_option => true}) do
  97     query
  98   end
  99
 100   defp exclude_notification_muted(query, user, opts) do
 101     notification_muted_ap_ids =
 102       opts[:notification_muted_users_ap_ids] || User.notification_muted_users_ap_ids(user)
 103
 104     query
 105     |> where([n, a], a.actor not in ^notification_muted_ap_ids)
 106     |> join(:left, [n, a], tm in ThreadMute,
 107       on: tm.user_id == ^user.id and tm.context == fragment("?->>'context'", a.data)
 108     )
 109     |> where([n, a, o, tm], is_nil(tm.user_id))
 110   end
 111
 112   defp exclude_move(query, %{with_move: true}) do
 113     query
 114   end
 115
 116   defp exclude_move(query, _opts) do
 117     where(query, [n, a], fragment("?->>'type' != 'Move'", a.data))
 118   end
 119
 120   @valid_visibilities ~w[direct unlisted public private]
 121
 122   defp exclude_visibility(query, %{exclude_visibilities: visibility})
 123        when is_list(visibility) do
 124     if Enum.all?(visibility, &(&1 in @valid_visibilities)) do
 125       query
 126       |> join(:left, [n, a], mutated_activity in Pleroma.Activity,
 127         on:
 128           fragment("?->>'context'", a.data) ==
 129             fragment("?->>'context'", mutated_activity.data) and
 130             fragment("(?->>'type' = 'Like' or ?->>'type' = 'Announce')", a.data, a.data) and
 131             fragment("?->>'type'", mutated_activity.data) == "Create",
 132         as: :mutated_activity
 133       )
 134       |> where(
 135         [n, a, mutated_activity: mutated_activity],
 136         not fragment(
 137           """
 138           CASE WHEN (?->>'type') = 'Like' or (?->>'type') = 'Announce'
 139             THEN (activity_visibility(?, ?, ?) = ANY (?))
 140             ELSE (activity_visibility(?, ?, ?) = ANY (?)) END
 141           """,
 142           a.data,
 143           a.data,
 144           mutated_activity.actor,
 145           mutated_activity.recipients,
 146           mutated_activity.data,
 147           ^visibility,
 148           a.actor,
 149           a.recipients,
 150           a.data,
 151           ^visibility
 152         )
 153       )
 154     else
 155       Logger.error("Could not exclude visibility to #{visibility}")
 156       query
 157     end
 158   end
 159
 160   defp exclude_visibility(query, %{exclude_visibilities: visibility})
 161        when visibility in @valid_visibilities do
 162     exclude_visibility(query, [visibility])
 163   end
 164
 165   defp exclude_visibility(query, %{exclude_visibilities: visibility})
 166        when visibility not in @valid_visibilities do
 167     Logger.error("Could not exclude visibility to #{visibility}")
 168     query
 169   end
 170
 171   defp exclude_visibility(query, _visibility), do: query
 172
 173   def for_user(user, opts \\ %{}) do
 174     user
 175     |> for_user_query(opts)
 176     |> Pagination.fetch_paginated(opts)
 177   end
 178
 179   @doc """
 180   Returns notifications for user received since given date.
 181
 182   ## Examples
 183
 184       iex> Pleroma.Notification.for_user_since(%Pleroma.User{}, ~N[2019-04-13 11:22:33])
 185       [%Pleroma.Notification{}, %Pleroma.Notification{}]
 186
 187       iex> Pleroma.Notification.for_user_since(%Pleroma.User{}, ~N[2019-04-15 11:22:33])
 188       []
 189   """
 190   @spec for_user_since(Pleroma.User.t(), NaiveDateTime.t()) :: [t()]
 191   def for_user_since(user, date) do
 192     from(n in for_user_query(user),
 193       where: n.updated_at > ^date
 194     )
 195     |> Repo.all()
 196   end
 197
 198   def set_read_up_to(%{id: user_id} = _user, id) do
 199     query =
 200       from(
 201         n in Notification,
 202         where: n.user_id == ^user_id,
 203         where: n.id <= ^id,
 204         where: n.seen == false,
 205         update: [
 206           set: [
 207             seen: true,
 208             updated_at: ^NaiveDateTime.utc_now()
 209           ]
 210         ],
 211         # Ideally we would preload object and activities here
 212         # but Ecto does not support preloads in update_all
 213         select: n.id
 214       )
 215
 216     {_, notification_ids} = Repo.update_all(query, [])
 217
 218     Notification
 219     |> where([n], n.id in ^notification_ids)
 220     |> join(:inner, [n], activity in assoc(n, :activity))
 221     |> join(:left, [n, a], object in Object,
 222       on:
 223         fragment(
 224           "(?->>'id') = COALESCE((? -> 'object'::text) ->> 'id'::text)",
 225           object.data,
 226           a.data
 227         )
 228     )
 229     |> preload([n, a, o], activity: {a, object: o})
 230     |> Repo.all()
 231   end
 232
 233   def read_one(%User{} = user, notification_id) do
 234     with {:ok, %Notification{} = notification} <- get(user, notification_id) do
 235       notification
 236       |> changeset(%{seen: true})
 237       |> Repo.update()
 238     end
 239   end
 240
 241   def get(%{id: user_id} = _user, id) do
 242     query =
 243       from(
 244         n in Notification,
 245         where: n.id == ^id,
 246         join: activity in assoc(n, :activity),
 247         preload: [activity: activity]
 248       )
 249
 250     notification = Repo.one(query)
 251
 252     case notification do
 253       %{user_id: ^user_id} ->
 254         {:ok, notification}
 255
 256       _ ->
 257         {:error, "Cannot get notification"}
 258     end
 259   end
 260
 261   def clear(user) do
 262     from(n in Notification, where: n.user_id == ^user.id)
 263     |> Repo.delete_all()
 264   end
 265
 266   def destroy_multiple(%{id: user_id} = _user, ids) do
 267     from(n in Notification,
 268       where: n.id in ^ids,
 269       where: n.user_id == ^user_id
 270     )
 271     |> Repo.delete_all()
 272   end
 273
 274   def dismiss(%{id: user_id} = _user, id) do
 275     notification = Repo.get(Notification, id)
 276
 277     case notification do
 278       %{user_id: ^user_id} ->
 279         Repo.delete(notification)
 280
 281       _ ->
 282         {:error, "Cannot dismiss notification"}
 283     end
 284   end
 285
 286   def create_notifications(%Activity{data: %{"to" => _, "type" => "Create"}} = activity) do
 287     object = Object.normalize(activity)
 288
 289     if object && object.data["type"] == "Answer" do
 290       {:ok, []}
 291     else
 292       do_create_notifications(activity)
 293     end
 294   end
 295
 296   def create_notifications(%Activity{data: %{"type" => type}} = activity)
 297       when type in ["Like", "Announce", "Follow", "Move", "EmojiReact"] do
 298     do_create_notifications(activity)
 299   end
 300
 301   def create_notifications(_), do: {:ok, []}
 302
 303   defp do_create_notifications(%Activity{} = activity) do
 304     {enabled_receivers, disabled_receivers} = get_notified_from_activity(activity)
 305     potential_receivers = enabled_receivers ++ disabled_receivers
 306
 307     notifications =
 308       Enum.map(potential_receivers, fn user ->
 309         do_send = user in enabled_receivers
 310         create_notification(activity, user, do_send)
 311       end)
 312
 313     {:ok, notifications}
 314   end
 315
 316   # TODO move to sql, too.
 317   def create_notification(%Activity{} = activity, %User{} = user, do_send \\ true) do
 318     unless skip?(activity, user) do
 319       notification = %Notification{user_id: user.id, activity: activity}
 320       {:ok, notification} = Repo.insert(notification)
 321
 322       if do_send do
 323         Streamer.stream(["user", "user:notification"], notification)
 324         Push.send(notification)
 325       end
 326
 327       notification
 328     end
 329   end
 330
 331   @doc """
 332   Returns a tuple with 2 elements:
 333     {enabled notification receivers, currently disabled receivers (blocking / [thread] muting)}
 334
 335   NOTE: might be called for FAKE Activities, see ActivityPub.Utils.get_notified_from_object/1
 336   """
 337   def get_notified_from_activity(activity, local_only \\ true)
 338
 339   def get_notified_from_activity(%Activity{data: %{"type" => type}} = activity, local_only)
 340       when type in ["Create", "Like", "Announce", "Follow", "Move", "EmojiReact"] do
 341     potential_receiver_ap_ids =
 342       []
 343       |> Utils.maybe_notify_to_recipients(activity)
 344       |> Utils.maybe_notify_mentioned_recipients(activity)
 345       |> Utils.maybe_notify_subscribers(activity)
 346       |> Utils.maybe_notify_followers(activity)
 347       |> Enum.uniq()
 348
 349     # Since even subscribers and followers can mute / thread-mute, filtering all above AP IDs
 350     notification_enabled_ap_ids =
 351       potential_receiver_ap_ids
 352       |> exclude_relationship_restricted_ap_ids(activity)
 353       |> exclude_thread_muter_ap_ids(activity)
 354
 355     potential_receivers =
 356       potential_receiver_ap_ids
 357       |> Enum.uniq()
 358       |> User.get_users_from_set(local_only)
 359
 360     notification_enabled_users =
 361       Enum.filter(potential_receivers, fn u -> u.ap_id in notification_enabled_ap_ids end)
 362
 363     {notification_enabled_users, potential_receivers -- notification_enabled_users}
 364   end
 365
 366   def get_notified_from_activity(_, _local_only), do: {[], []}
 367
 368   @doc "Filters out AP IDs of users basing on their relationships with activity actor user"
 369   def exclude_relationship_restricted_ap_ids([], _activity), do: []
 370
 371   def exclude_relationship_restricted_ap_ids(ap_ids, %Activity{} = activity) do
 372     relationship_restricted_ap_ids =
 373       activity
 374       |> Activity.user_actor()
 375       |> User.incoming_relationships_ungrouped_ap_ids([
 376         :block,
 377         :notification_mute
 378       ])
 379
 380     Enum.uniq(ap_ids) -- relationship_restricted_ap_ids
 381   end
 382
 383   @doc "Filters out AP IDs of users who mute activity thread"
 384   def exclude_thread_muter_ap_ids([], _activity), do: []
 385
 386   def exclude_thread_muter_ap_ids(ap_ids, %Activity{} = activity) do
 387     thread_muter_ap_ids = ThreadMute.muter_ap_ids(activity.data["context"])
 388
 389     Enum.uniq(ap_ids) -- thread_muter_ap_ids
 390   end
 391
 392   @spec skip?(Activity.t(), User.t()) :: boolean()
 393   def skip?(%Activity{} = activity, %User{} = user) do
 394     [
 395       :self,
 396       :followers,
 397       :follows,
 398       :non_followers,
 399       :non_follows,
 400       :recently_followed
 401     ]
 402     |> Enum.find(&skip?(&1, activity, user))
 403   end
 404
 405   def skip?(_, _), do: false
 406
 407   @spec skip?(atom(), Activity.t(), User.t()) :: boolean()
 408   def skip?(:self, %Activity{} = activity, %User{} = user) do
 409     activity.data["actor"] == user.ap_id
 410   end
 411
 412   def skip?(
 413         :followers,
 414         %Activity{} = activity,
 415         %User{notification_settings: %{followers: false}} = user
 416       ) do
 417     actor = activity.data["actor"]
 418     follower = User.get_cached_by_ap_id(actor)
 419     User.following?(follower, user)
 420   end
 421
 422   def skip?(
 423         :non_followers,
 424         %Activity{} = activity,
 425         %User{notification_settings: %{non_followers: false}} = user
 426       ) do
 427     actor = activity.data["actor"]
 428     follower = User.get_cached_by_ap_id(actor)
 429     !User.following?(follower, user)
 430   end
 431
 432   def skip?(
 433         :follows,
 434         %Activity{} = activity,
 435         %User{notification_settings: %{follows: false}} = user
 436       ) do
 437     actor = activity.data["actor"]
 438     followed = User.get_cached_by_ap_id(actor)
 439     User.following?(user, followed)
 440   end
 441
 442   def skip?(
 443         :non_follows,
 444         %Activity{} = activity,
 445         %User{notification_settings: %{non_follows: false}} = user
 446       ) do
 447     actor = activity.data["actor"]
 448     followed = User.get_cached_by_ap_id(actor)
 449     !User.following?(user, followed)
 450   end
 451
 452   # To do: consider defining recency in hours and checking FollowingRelationship with a single SQL
 453   def skip?(:recently_followed, %Activity{data: %{"type" => "Follow"}} = activity, %User{} = user) do
 454     actor = activity.data["actor"]
 455
 456     Notification.for_user(user)
 457     |> Enum.any?(fn
 458       %{activity: %{data: %{"type" => "Follow", "actor" => ^actor}}} -> true
 459       _ -> false
 460     end)
 461   end
 462
 463   def skip?(_, _, _), do: false
 464 end