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# Pleroma: A lightweight social networking server
# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Notification do
use Ecto.Schema
alias Pleroma.Activity
alias Pleroma.Notification
alias Pleroma.Object
alias Pleroma.Pagination
alias Pleroma.Repo
alias Pleroma.ThreadMute
alias Pleroma.User
alias Pleroma.Web.CommonAPI.Utils
alias Pleroma.Web.Push
alias Pleroma.Web.Streamer
import Ecto.Query
import Ecto.Changeset
require Logger
@type t :: %__MODULE__{}
@include_muted_option :with_muted
schema "notifications" do
field(:seen, :boolean, default: false)
belongs_to(:user, User, type: FlakeId.Ecto.CompatType)
belongs_to(:activity, Activity, type: FlakeId.Ecto.CompatType)
timestamps()
end
def changeset(%Notification{} = notification, attrs) do
notification
|> cast(attrs, [:seen])
end
defp for_user_query_ap_id_opts(user, opts) do
ap_id_relationships =
[:block] ++
if opts[@include_muted_option], do: [], else: [:notification_mute]
preloaded_ap_ids = User.outgoing_relationships_ap_ids(user, ap_id_relationships)
exclude_blocked_opts = Map.merge(%{blocked_users_ap_ids: preloaded_ap_ids[:block]}, opts)
exclude_notification_muted_opts =
Map.merge(%{notification_muted_users_ap_ids: preloaded_ap_ids[:notification_mute]}, opts)
{exclude_blocked_opts, exclude_notification_muted_opts}
end
def for_user_query(user, opts \\ %{}) do
{exclude_blocked_opts, exclude_notification_muted_opts} =
for_user_query_ap_id_opts(user, opts)
Notification
|> where(user_id: ^user.id)
|> where(
[n, a],
fragment(
"? not in (SELECT ap_id FROM users WHERE deactivated = 'true')",
a.actor
)
)
|> join(:inner, [n], activity in assoc(n, :activity))
|> join(:left, [n, a], object in Object,
on:
fragment(
"(?->>'id') = COALESCE((? -> 'object'::text) ->> 'id'::text)",
object.data,
a.data
)
)
|> preload([n, a, o], activity: {a, object: o})
|> exclude_notification_muted(user, exclude_notification_muted_opts)
|> exclude_blocked(user, exclude_blocked_opts)
|> exclude_visibility(opts)
|> exclude_move(opts)
end
defp exclude_blocked(query, user, opts) do
blocked_ap_ids = opts[:blocked_users_ap_ids] || User.blocked_users_ap_ids(user)
query
|> where([n, a], a.actor not in ^blocked_ap_ids)
|> where(
[n, a],
fragment("substring(? from '.*://([^/]*)')", a.actor) not in ^user.domain_blocks
)
end
defp exclude_notification_muted(query, _, %{@include_muted_option => true}) do
query
end
defp exclude_notification_muted(query, user, opts) do
notification_muted_ap_ids =
opts[:notification_muted_users_ap_ids] || User.notification_muted_users_ap_ids(user)
query
|> where([n, a], a.actor not in ^notification_muted_ap_ids)
|> join(:left, [n, a], tm in ThreadMute,
on: tm.user_id == ^user.id and tm.context == fragment("?->>'context'", a.data)
)
|> where([n, a, o, tm], is_nil(tm.user_id))
end
defp exclude_move(query, %{with_move: true}) do
query
end
defp exclude_move(query, _opts) do
where(query, [n, a], fragment("?->>'type' != 'Move'", a.data))
end
@valid_visibilities ~w[direct unlisted public private]
defp exclude_visibility(query, %{exclude_visibilities: visibility})
when is_list(visibility) do
if Enum.all?(visibility, &(&1 in @valid_visibilities)) do
query
|> join(:left, [n, a], mutated_activity in Pleroma.Activity,
on:
fragment("?->>'context'", a.data) ==
fragment("?->>'context'", mutated_activity.data) and
fragment("(?->>'type' = 'Like' or ?->>'type' = 'Announce')", a.data, a.data) and
fragment("?->>'type'", mutated_activity.data) == "Create",
as: :mutated_activity
)
|> where(
[n, a, mutated_activity: mutated_activity],
not fragment(
"""
CASE WHEN (?->>'type') = 'Like' or (?->>'type') = 'Announce'
THEN (activity_visibility(?, ?, ?) = ANY (?))
ELSE (activity_visibility(?, ?, ?) = ANY (?)) END
""",
a.data,
a.data,
mutated_activity.actor,
mutated_activity.recipients,
mutated_activity.data,
^visibility,
a.actor,
a.recipients,
a.data,
^visibility
)
)
else
Logger.error("Could not exclude visibility to #{visibility}")
query
end
end
defp exclude_visibility(query, %{exclude_visibilities: visibility})
when visibility in @valid_visibilities do
exclude_visibility(query, [visibility])
end
defp exclude_visibility(query, %{exclude_visibilities: visibility})
when visibility not in @valid_visibilities do
Logger.error("Could not exclude visibility to #{visibility}")
query
end
defp exclude_visibility(query, _visibility), do: query
def for_user(user, opts \\ %{}) do
user
|> for_user_query(opts)
|> Pagination.fetch_paginated(opts)
end
@doc """
Returns notifications for user received since given date.
## Examples
iex> Pleroma.Notification.for_user_since(%Pleroma.User{}, ~N[2019-04-13 11:22:33])
[%Pleroma.Notification{}, %Pleroma.Notification{}]
iex> Pleroma.Notification.for_user_since(%Pleroma.User{}, ~N[2019-04-15 11:22:33])
[]
"""
@spec for_user_since(Pleroma.User.t(), NaiveDateTime.t()) :: [t()]
def for_user_since(user, date) do
from(n in for_user_query(user),
where: n.updated_at > ^date
)
|> Repo.all()
end
def set_read_up_to(%{id: user_id} = _user, id) do
query =
from(
n in Notification,
where: n.user_id == ^user_id,
where: n.id <= ^id,
where: n.seen == false,
update: [
set: [
seen: true,
updated_at: ^NaiveDateTime.utc_now()
]
],
# Ideally we would preload object and activities here
# but Ecto does not support preloads in update_all
select: n.id
)
{_, notification_ids} = Repo.update_all(query, [])
Notification
|> where([n], n.id in ^notification_ids)
|> join(:inner, [n], activity in assoc(n, :activity))
|> join(:left, [n, a], object in Object,
on:
fragment(
"(?->>'id') = COALESCE((? -> 'object'::text) ->> 'id'::text)",
object.data,
a.data
)
)
|> preload([n, a, o], activity: {a, object: o})
|> Repo.all()
end
def read_one(%User{} = user, notification_id) do
with {:ok, %Notification{} = notification} <- get(user, notification_id) do
notification
|> changeset(%{seen: true})
|> Repo.update()
end
end
def get(%{id: user_id} = _user, id) do
query =
from(
n in Notification,
where: n.id == ^id,
join: activity in assoc(n, :activity),
preload: [activity: activity]
)
notification = Repo.one(query)
case notification do
%{user_id: ^user_id} ->
{:ok, notification}
_ ->
{:error, "Cannot get notification"}
end
end
def clear(user) do
from(n in Notification, where: n.user_id == ^user.id)
|> Repo.delete_all()
end
def destroy_multiple(%{id: user_id} = _user, ids) do
from(n in Notification,
where: n.id in ^ids,
where: n.user_id == ^user_id
)
|> Repo.delete_all()
end
def dismiss(%Pleroma.Activity{} = activity) do
Notification
|> where([n], n.activity_id == ^activity.id)
|> Repo.delete_all()
|> case do
{_, notifications} -> {:ok, notifications}
_ -> {:error, "Cannot dismiss notification"}
end
end
def dismiss(%{id: user_id} = _user, id) do
notification = Repo.get(Notification, id)
case notification do
%{user_id: ^user_id} ->
Repo.delete(notification)
_ ->
{:error, "Cannot dismiss notification"}
end
end
def create_notifications(%Activity{data: %{"to" => _, "type" => "Create"}} = activity) do
object = Object.normalize(activity)
if object && object.data["type"] == "Answer" do
{:ok, []}
else
do_create_notifications(activity)
end
end
def create_notifications(%Activity{data: %{"type" => type}} = activity)
when type in ["Follow", "Like", "Announce", "Move", "EmojiReact"] do
do_create_notifications(activity)
end
def create_notifications(_), do: {:ok, []}
defp do_create_notifications(%Activity{} = activity) do
{enabled_receivers, disabled_receivers} = get_notified_from_activity(activity)
potential_receivers = enabled_receivers ++ disabled_receivers
notifications =
Enum.map(potential_receivers, fn user ->
do_send = user in enabled_receivers
create_notification(activity, user, do_send)
end)
{:ok, notifications}
end
# TODO move to sql, too.
def create_notification(%Activity{} = activity, %User{} = user, do_send \\ true) do
unless skip?(activity, user) do
notification = %Notification{user_id: user.id, activity: activity}
{:ok, notification} = Repo.insert(notification)
if do_send do
Streamer.stream(["user", "user:notification"], notification)
Push.send(notification)
end
notification
end
end
@doc """
Returns a tuple with 2 elements:
{enabled notification receivers, currently disabled receivers (blocking / [thread] muting)}
NOTE: might be called for FAKE Activities, see ActivityPub.Utils.get_notified_from_object/1
"""
def get_notified_from_activity(activity, local_only \\ true)
def get_notified_from_activity(%Activity{data: %{"type" => type}} = activity, local_only)
when type in ["Create", "Like", "Announce", "Follow", "Move", "EmojiReact"] do
potential_receiver_ap_ids =
[]
|> Utils.maybe_notify_to_recipients(activity)
|> Utils.maybe_notify_mentioned_recipients(activity)
|> Utils.maybe_notify_subscribers(activity)
|> Utils.maybe_notify_followers(activity)
|> Enum.uniq()
# Since even subscribers and followers can mute / thread-mute, filtering all above AP IDs
notification_enabled_ap_ids =
potential_receiver_ap_ids
|> exclude_relationship_restricted_ap_ids(activity)
|> exclude_thread_muter_ap_ids(activity)
potential_receivers =
potential_receiver_ap_ids
|> Enum.uniq()
|> User.get_users_from_set(local_only)
notification_enabled_users =
Enum.filter(potential_receivers, fn u -> u.ap_id in notification_enabled_ap_ids end)
{notification_enabled_users, potential_receivers -- notification_enabled_users}
end
def get_notified_from_activity(_, _local_only), do: {[], []}
@doc "Filters out AP IDs of users basing on their relationships with activity actor user"
def exclude_relationship_restricted_ap_ids([], _activity), do: []
def exclude_relationship_restricted_ap_ids(ap_ids, %Activity{} = activity) do
relationship_restricted_ap_ids =
activity
|> Activity.user_actor()
|> User.incoming_relationships_ungrouped_ap_ids([
:block,
:notification_mute
])
Enum.uniq(ap_ids) -- relationship_restricted_ap_ids
end
@doc "Filters out AP IDs of users who mute activity thread"
def exclude_thread_muter_ap_ids([], _activity), do: []
def exclude_thread_muter_ap_ids(ap_ids, %Activity{} = activity) do
thread_muter_ap_ids = ThreadMute.muter_ap_ids(activity.data["context"])
Enum.uniq(ap_ids) -- thread_muter_ap_ids
end
@spec skip?(Activity.t(), User.t()) :: boolean()
def skip?(%Activity{} = activity, %User{} = user) do
[
:self,
:followers,
:follows,
:non_followers,
:non_follows,
:recently_followed
]
|> Enum.find(&skip?(&1, activity, user))
end
def skip?(_, _), do: false
@spec skip?(atom(), Activity.t(), User.t()) :: boolean()
def skip?(:self, %Activity{} = activity, %User{} = user) do
activity.data["actor"] == user.ap_id
end
def skip?(
:followers,
%Activity{} = activity,
%User{notification_settings: %{followers: false}} = user
) do
actor = activity.data["actor"]
follower = User.get_cached_by_ap_id(actor)
User.following?(follower, user)
end
def skip?(
:non_followers,
%Activity{} = activity,
%User{notification_settings: %{non_followers: false}} = user
) do
actor = activity.data["actor"]
follower = User.get_cached_by_ap_id(actor)
!User.following?(follower, user)
end
def skip?(
:follows,
%Activity{} = activity,
%User{notification_settings: %{follows: false}} = user
) do
actor = activity.data["actor"]
followed = User.get_cached_by_ap_id(actor)
User.following?(user, followed)
end
def skip?(
:non_follows,
%Activity{} = activity,
%User{notification_settings: %{non_follows: false}} = user
) do
actor = activity.data["actor"]
followed = User.get_cached_by_ap_id(actor)
!User.following?(user, followed)
end
# To do: consider defining recency in hours and checking FollowingRelationship with a single SQL
def skip?(:recently_followed, %Activity{data: %{"type" => "Follow"}} = activity, %User{} = user) do
actor = activity.data["actor"]
Notification.for_user(user)
|> Enum.any?(fn
%{activity: %{data: %{"type" => "Follow", "actor" => ^actor}}} -> true
_ -> false
end)
end
def skip?(_, _, _), do: false
end

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