# Pleroma: A lightweight social networking server # Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/> # SPDX-License-Identifier: AGPL-3.0-only defmodule Pleroma.Notification do use Ecto.Schema alias Ecto.Multi alias Pleroma.Activity alias Pleroma.FollowingRelationship alias Pleroma.Marker alias Pleroma.Notification alias Pleroma.Object alias Pleroma.Pagination alias Pleroma.Repo alias Pleroma.ThreadMute alias Pleroma.User alias Pleroma.Web.CommonAPI 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) # This is an enum type in the database. If you add a new notification type, # remember to add a migration to add it to the `notifications_type` enum # as well. field(:type, :string) belongs_to(:user, User, type: FlakeId.Ecto.CompatType) belongs_to(:activity, Activity, type: FlakeId.Ecto.CompatType) timestamps() end def update_notification_type(user, activity) do with %__MODULE__{} = notification <- Repo.get_by(__MODULE__, user_id: user.id, activity_id: activity.id) do type = activity |> type_from_activity() notification |> changeset(%{type: type}) |> Repo.update() end end @spec unread_notifications_count(User.t()) :: integer() def unread_notifications_count(%User{id: user_id}) do from(q in __MODULE__, where: q.user_id == ^user_id and q.seen == false ) |> Repo.aggregate(:count, :id) end @notification_types ~w{ favourite follow follow_request mention move pleroma:emoji_reaction pleroma:report reblog poll } def changeset(%Notification{} = notification, attrs) do notification |> cast(attrs, [:seen, :type]) |> validate_inclusion(:type, @notification_types) end @spec last_read_query(User.t()) :: Ecto.Queryable.t() def last_read_query(user) do from(q in Pleroma.Notification, where: q.user_id == ^user.id, where: q.seen == true, select: type(q.id, :string), limit: 1, order_by: [desc: :id] ) 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) |> join(:inner, [n], activity in assoc(n, :activity)) |> join(:left, [n, a], object in Object, on: fragment( "(?->>'id') = COALESCE(?->'object'->>'id', ?->>'object')", object.data, a.data, a.data ) ) |> join(:inner, [_n, a], u in User, on: u.ap_id == a.actor, as: :user_actor) |> preload([n, a, o], activity: {a, object: o}) |> where([user_actor: user_actor], user_actor.is_active) |> exclude_notification_muted(user, exclude_notification_muted_opts) |> exclude_blocked(user, exclude_blocked_opts) |> exclude_blockers(user) |> exclude_filtered(user) |> exclude_visibility(opts) end # Excludes blocked users and non-followed domain-blocked users 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) |> restrict_domain_blocked(user) end defp restrict_domain_blocked(query, user) do where( query, [_, activity], fragment( # "(actor's domain NOT in domain_blocks)" """ NOT ( substring(? from '.*://([^/]*)') = ANY(?) ) """, activity.actor, ^user.domain_blocks ) ) end defp exclude_blockers(query, user) do if Pleroma.Config.get([:activitypub, :blockers_visible]) == true do query else blocker_ap_ids = User.incoming_relationships_ungrouped_ap_ids(user, [:block]) query |> where([n, a], a.actor not in ^blocker_ap_ids) end 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), as: :thread_mute ) |> where([thread_mute: thread_mute], is_nil(thread_mute.user_id)) end defp exclude_filtered(query, user) do case Pleroma.Filter.compose_regex(user) do nil -> query regex -> from([_n, a, o] in query, where: fragment("not(?->>'content' ~* ?)", o.data, ^regex) or fragment("?->>'actor' = ?", o.data, ^user.ap_id) ) end 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( "COALESCE((?->'object')->>'id', ?->>'object')", a.data, a.data ) == fragment( "COALESCE((?->'object')->>'id', ?->>'object')", mutated_activity.data, 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, # Ideally we would preload object and activities here # but Ecto does not support preloads in update_all select: n.id ) {:ok, %{ids: {_, notification_ids}}} = Multi.new() |> Multi.update_all(:ids, query, set: [seen: true, updated_at: NaiveDateTime.utc_now()]) |> Marker.multi_set_last_read_id(user, "notifications") |> Repo.transaction() for_user_query(user) |> where([n], n.id in ^notification_ids) |> Repo.all() end @spec read_one(User.t(), String.t()) :: {:ok, Notification.t()} | {:error, Ecto.Changeset.t()} | nil def read_one(%User{} = user, notification_id) do with {:ok, %Notification{} = notification} <- get(user, notification_id) do Multi.new() |> Multi.update(:update, changeset(notification, %{seen: true})) |> Marker.multi_set_last_read_id(user, "notifications") |> Repo.transaction() |> case do {:ok, %{update: notification}} -> {:ok, notification} {:error, :update, changeset, _} -> {:error, changeset} end 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 destroy_multiple_from_types(%{id: user_id}, types) do from(n in Notification, where: n.user_id == ^user_id, where: n.type in ^types ) |> 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 @spec create_notifications(Activity.t(), keyword()) :: {:ok, [Notification.t()] | []} def create_notifications(activity, options \\ []) def create_notifications(%Activity{data: %{"to" => _, "type" => "Create"}} = activity, options) do object = Object.normalize(activity, fetch: false) if object && object.data["type"] == "Answer" do {:ok, []} else do_create_notifications(activity, options) end end def create_notifications(%Activity{data: %{"type" => type}} = activity, options) when type in ["Follow", "Like", "Announce", "Move", "EmojiReact", "Flag", "Update"] do do_create_notifications(activity, options) end def create_notifications(_, _), do: {:ok, []} defp do_create_notifications(%Activity{} = activity, options) do do_send = Keyword.get(options, :do_send, true) {enabled_receivers, disabled_receivers} = get_notified_from_activity(activity) potential_receivers = enabled_receivers ++ disabled_receivers notifications = Enum.map(potential_receivers, fn user -> do_send = do_send && user in enabled_receivers create_notification(activity, user, do_send: do_send) end) |> Enum.reject(&is_nil/1) {:ok, notifications} end defp type_from_activity(%{data: %{"type" => type}} = activity) do case type do "Follow" -> if Activity.follow_accepted?(activity) do "follow" else "follow_request" end "Announce" -> "reblog" "Like" -> "favourite" "Move" -> "move" "EmojiReact" -> "pleroma:emoji_reaction" "Flag" -> "pleroma:report" # Compatibility with old reactions "EmojiReaction" -> "pleroma:emoji_reaction" "Create" -> activity |> type_from_activity_object() "Update" -> "update" t -> raise "No notification type for activity type #{t}" end end defp type_from_activity_object(%{data: %{"type" => "Create"}}), do: "mention" # TODO move to sql, too. def create_notification(%Activity{} = activity, %User{} = user, opts \\ []) do do_send = Keyword.get(opts, :do_send, true) type = Keyword.get(opts, :type, type_from_activity(activity)) unless skip?(activity, user, opts) do {:ok, %{notification: notification}} = Multi.new() |> Multi.insert(:notification, %Notification{ user_id: user.id, activity: activity, seen: mark_as_read?(activity, user), type: type }) |> Marker.multi_set_last_read_id(user, "notifications") |> Repo.transaction() if do_send do Streamer.stream(["user", "user:notification"], notification) Push.send(notification) end notification end end def create_poll_notifications(%Activity{} = activity) do with %Object{data: %{"type" => "Question", "actor" => actor} = data} <- Object.normalize(activity) do voters = case data do %{"voters" => voters} when is_list(voters) -> voters _ -> [] end notifications = Enum.reduce([actor | voters], [], fn ap_id, acc -> with %User{local: true} = user <- User.get_by_ap_id(ap_id) do [create_notification(activity, user, type: "poll") | acc] else _ -> acc end end) {:ok, notifications} end end @doc """ Returns a tuple with 2 elements: {notification-enabled receivers, currently disabled receivers (blocking / [thread] muting)} NOTE: might be called for FAKE Activities, see ActivityPub.Utils.get_notified_from_object/1 """ @spec get_notified_from_activity(Activity.t(), boolean()) :: {list(User.t()), list(User.t())} 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", "Flag", "Update" ] do potential_receiver_ap_ids = get_potential_receiver_ap_ids(activity) potential_receivers = User.get_users_from_set(potential_receiver_ap_ids, local_only: local_only) notification_enabled_ap_ids = potential_receiver_ap_ids |> exclude_domain_blocker_ap_ids(activity, potential_receivers) |> exclude_relationship_restricted_ap_ids(activity) |> exclude_thread_muter_ap_ids(activity) 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: {[], []} # For some activities, only notify the author of the object def get_potential_receiver_ap_ids(%{data: %{"type" => type, "object" => object_id}}) when type in ~w{Like Announce EmojiReact} do case Object.get_cached_by_ap_id(object_id) do %Object{data: %{"actor" => actor}} -> [actor] _ -> [] end end def get_potential_receiver_ap_ids(%{data: %{"type" => "Follow", "object" => object_id}}) do [object_id] end def get_potential_receiver_ap_ids(%{data: %{"type" => "Flag", "actor" => actor}}) do (User.all_superusers() |> Enum.map(fn user -> user.ap_id end)) -- [actor] end # Update activity: notify all who repeated this def get_potential_receiver_ap_ids(%{data: %{"type" => "Update", "actor" => actor}} = activity) do with %Object{data: %{"id" => object_id}} <- Object.normalize(activity, fetch: false) do repeaters = Activity.Queries.by_type("Announce") |> Activity.Queries.by_object_id(object_id) |> Activity.with_joined_user_actor() |> where([a, u], u.local) |> select([a, u], u.ap_id) |> Repo.all() repeaters -- [actor] end end def get_potential_receiver_ap_ids(activity) do [] |> Utils.maybe_notify_to_recipients(activity) |> Utils.maybe_notify_mentioned_recipients(activity) |> Utils.maybe_notify_subscribers(activity) |> Utils.maybe_notify_followers(activity) |> Enum.uniq() end @doc "Filters out AP IDs domain-blocking and not following the activity's actor" def exclude_domain_blocker_ap_ids(ap_ids, activity, preloaded_users \\ []) def exclude_domain_blocker_ap_ids([], _activity, _preloaded_users), do: [] def exclude_domain_blocker_ap_ids(ap_ids, %Activity{} = activity, preloaded_users) do activity_actor_domain = activity.actor && URI.parse(activity.actor).host users = ap_ids |> Enum.map(fn ap_id -> Enum.find(preloaded_users, &(&1.ap_id == ap_id)) || User.get_cached_by_ap_id(ap_id) end) |> Enum.filter(& &1) domain_blocker_ap_ids = for u <- users, activity_actor_domain in u.domain_blocks, do: u.ap_id domain_blocker_follower_ap_ids = if Enum.any?(domain_blocker_ap_ids) do activity |> Activity.user_actor() |> FollowingRelationship.followers_ap_ids(domain_blocker_ap_ids) else [] end ap_ids |> Kernel.--(domain_blocker_ap_ids) |> Kernel.++(domain_blocker_follower_ap_ids) end @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 def skip?(activity, user, opts \\ []) @spec skip?(Activity.t(), User.t(), Keyword.t()) :: boolean() def skip?(%Activity{} = activity, %User{} = user, opts) do [ :self, :invisible, :block_from_strangers, :recently_followed, :filtered ] |> Enum.find(&skip?(&1, activity, user, opts)) end def skip?(_activity, _user, _opts), do: false @spec skip?(atom(), Activity.t(), User.t(), Keyword.t()) :: boolean() def skip?(:self, %Activity{} = activity, %User{} = user, opts) do cond do opts[:type] == "poll" -> false activity.data["actor"] == user.ap_id -> true true -> false end end def skip?(:invisible, %Activity{} = activity, _user, _opts) do actor = activity.data["actor"] user = User.get_cached_by_ap_id(actor) User.invisible?(user) end def skip?( :block_from_strangers, %Activity{} = activity, %User{notification_settings: %{block_from_strangers: true}} = user, opts ) do actor = activity.data["actor"] follower = User.get_cached_by_ap_id(actor) cond do opts[:type] == "poll" -> false user.ap_id == actor -> false !User.following?(follower, user) -> true true -> false end 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, _opts ) do actor = activity.data["actor"] Notification.for_user(user) |> Enum.any?(fn %{activity: %{data: %{"type" => "Follow", "actor" => ^actor}}} -> true _ -> false end) end def skip?(:filtered, %{data: %{"type" => type}}, _user, _opts) when type in ["Follow", "Move"], do: false def skip?(:filtered, activity, user, _opts) do object = Object.normalize(activity, fetch: false) cond do is_nil(object) -> false object.data["actor"] == user.ap_id -> false not is_nil(regex = Pleroma.Filter.compose_regex(user, :re)) -> Regex.match?(regex, object.data["content"]) true -> false end end def skip?(_type, _activity, _user, _opts), do: false def mark_as_read?(activity, target_user) do user = Activity.user_actor(activity) User.mutes_user?(target_user, user) || CommonAPI.thread_muted?(target_user, activity) end def for_user_and_activity(user, activity) do from(n in __MODULE__, where: n.user_id == ^user.id, where: n.activity_id == ^activity.id ) |> Repo.one() end @spec mark_context_as_read(User.t(), String.t()) :: {integer(), nil | [term()]} def mark_context_as_read(%User{id: id}, context) do from( n in Notification, join: a in assoc(n, :activity), where: n.user_id == ^id, where: n.seen == false, where: fragment("?->>'context'", a.data) == ^context ) |> Repo.update_all(set: [seen: true]) end end