1 # Pleroma: A lightweight social networking server
2 # Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
3 # SPDX-License-Identifier: AGPL-3.0-only
5 defmodule Pleroma.Web.ActivityPub.ActivityPub do
7 alias Pleroma.Instances
8 alias Pleroma.Notification
10 alias Pleroma.Object.Fetcher
11 alias Pleroma.Pagination
15 alias Pleroma.Web.ActivityPub.MRF
16 alias Pleroma.Web.ActivityPub.Transmogrifier
17 alias Pleroma.Web.Federator
18 alias Pleroma.Web.WebFinger
21 import Pleroma.Web.ActivityPub.Utils
22 import Pleroma.Web.ActivityPub.Visibility
26 @httpoison Application.get_env(:pleroma, :httpoison)
28 # For Announce activities, we filter the recipients based on following status for any actors
29 # that match actual users. See issue #164 for more information about why this is necessary.
30 defp get_recipients(%{"type" => "Announce"} = data) do
33 actor = User.get_cached_by_ap_id(data["actor"])
37 |> Enum.filter(fn recipient ->
38 case User.get_cached_by_ap_id(recipient) do
43 User.following?(user, actor)
50 defp get_recipients(%{"type" => "Create"} = data) do
53 actor = data["actor"] || []
54 recipients = (to ++ cc ++ [actor]) |> Enum.uniq()
58 defp get_recipients(data) do
65 defp check_actor_is_active(actor) do
66 if not is_nil(actor) do
67 with user <- User.get_cached_by_ap_id(actor),
68 false <- user.info.deactivated do
78 defp check_remote_limit(%{"object" => %{"content" => content}}) when not is_nil(content) do
79 limit = Pleroma.Config.get([:instance, :remote_limit])
80 String.length(content) <= limit
83 defp check_remote_limit(_), do: true
85 def increase_note_count_if_public(actor, object) do
86 if is_public?(object), do: User.increase_note_count(actor), else: {:ok, actor}
89 def decrease_note_count_if_public(actor, object) do
90 if is_public?(object), do: User.decrease_note_count(actor), else: {:ok, actor}
93 def increase_replies_count_if_reply(%{
94 "object" => %{"inReplyTo" => reply_ap_id} = object,
97 if is_public?(object) do
98 Object.increase_replies_count(reply_ap_id)
102 def increase_replies_count_if_reply(_create_data), do: :noop
104 def decrease_replies_count_if_reply(%Object{
105 data: %{"inReplyTo" => reply_ap_id} = object
107 if is_public?(object) do
108 Object.decrease_replies_count(reply_ap_id)
112 def decrease_replies_count_if_reply(_object), do: :noop
114 def insert(map, local \\ true, fake \\ false) when is_map(map) do
115 with nil <- Activity.normalize(map),
116 map <- lazy_put_activity_defaults(map, fake),
117 :ok <- check_actor_is_active(map["actor"]),
118 {_, true} <- {:remote_limit_error, check_remote_limit(map)},
119 {:ok, map} <- MRF.filter(map),
120 {recipients, _, _} = get_recipients(map),
121 {:fake, false, map, recipients} <- {:fake, fake, map, recipients},
122 {:ok, map, object} <- insert_full_object(map) do
124 Repo.insert(%Activity{
128 recipients: recipients
131 # Splice in the child object if we have one.
133 if !is_nil(object) do
134 Map.put(activity, :object, object)
140 Pleroma.Web.RichMedia.Helpers.fetch_data_for_activity(activity)
143 Notification.create_notifications(activity)
147 %Activity{} = activity ->
150 {:fake, true, map, recipients} ->
151 activity = %Activity{
155 recipients: recipients,
159 Pleroma.Web.RichMedia.Helpers.fetch_data_for_activity(activity)
167 def stream_out(activity) do
168 public = "https://www.w3.org/ns/activitystreams#Public"
170 if activity.data["type"] in ["Create", "Announce", "Delete"] do
171 object = Object.normalize(activity.data["object"])
172 Pleroma.Web.Streamer.stream("user", activity)
173 Pleroma.Web.Streamer.stream("list", activity)
175 if Enum.member?(activity.data["to"], public) do
176 Pleroma.Web.Streamer.stream("public", activity)
179 Pleroma.Web.Streamer.stream("public:local", activity)
182 if activity.data["type"] in ["Create"] do
184 |> Map.get("tag", [])
185 |> Enum.filter(fn tag -> is_bitstring(tag) end)
186 |> Enum.each(fn tag -> Pleroma.Web.Streamer.stream("hashtag:" <> tag, activity) end)
188 if object.data["attachment"] != [] do
189 Pleroma.Web.Streamer.stream("public:media", activity)
192 Pleroma.Web.Streamer.stream("public:local:media", activity)
197 if !Enum.member?(activity.data["cc"] || [], public) &&
200 User.get_by_ap_id(activity.data["actor"]).follower_address
202 do: Pleroma.Web.Streamer.stream("direct", activity)
207 def create(%{to: to, actor: actor, context: context, object: object} = params, fake \\ false) do
208 additional = params[:additional] || %{}
209 # only accept false as false value
210 local = !(params[:local] == false)
211 published = params[:published]
215 %{to: to, actor: actor, published: published, context: context, object: object},
218 {:ok, activity} <- insert(create_data, local, fake),
219 {:fake, false, activity} <- {:fake, fake, activity},
220 _ <- increase_replies_count_if_reply(create_data),
221 # Changing note count prior to enqueuing federation task in order to avoid
222 # race conditions on updating user.info
223 {:ok, _actor} <- increase_note_count_if_public(actor, activity),
224 :ok <- maybe_federate(activity) do
227 {:fake, true, activity} ->
232 def accept(%{to: to, actor: actor, object: object} = params) do
233 # only accept false as false value
234 local = !(params[:local] == false)
236 with data <- %{"to" => to, "type" => "Accept", "actor" => actor.ap_id, "object" => object},
237 {:ok, activity} <- insert(data, local),
238 :ok <- maybe_federate(activity) do
243 def reject(%{to: to, actor: actor, object: object} = params) do
244 # only accept false as false value
245 local = !(params[:local] == false)
247 with data <- %{"to" => to, "type" => "Reject", "actor" => actor.ap_id, "object" => object},
248 {:ok, activity} <- insert(data, local),
249 :ok <- maybe_federate(activity) do
254 def update(%{to: to, cc: cc, actor: actor, object: object} = params) do
255 # only accept false as false value
256 local = !(params[:local] == false)
265 {:ok, activity} <- insert(data, local),
266 :ok <- maybe_federate(activity) do
271 # TODO: This is weird, maybe we shouldn't check here if we can make the activity.
273 %User{ap_id: ap_id} = user,
274 %Object{data: %{"id" => _}} = object,
278 with nil <- get_existing_like(ap_id, object),
279 like_data <- make_like_data(user, object, activity_id),
280 {:ok, activity} <- insert(like_data, local),
281 {:ok, object} <- add_like_to_object(activity, object),
282 :ok <- maybe_federate(activity) do
283 {:ok, activity, object}
285 %Activity{} = activity -> {:ok, activity, object}
286 error -> {:error, error}
296 with %Activity{} = like_activity <- get_existing_like(actor.ap_id, object),
297 unlike_data <- make_unlike_data(actor, like_activity, activity_id),
298 {:ok, unlike_activity} <- insert(unlike_data, local),
299 {:ok, _activity} <- Repo.delete(like_activity),
300 {:ok, object} <- remove_like_from_object(like_activity, object),
301 :ok <- maybe_federate(unlike_activity) do
302 {:ok, unlike_activity, like_activity, object}
309 %User{ap_id: _} = user,
310 %Object{data: %{"id" => _}} = object,
315 with true <- is_public?(object),
316 announce_data <- make_announce_data(user, object, activity_id, public),
317 {:ok, activity} <- insert(announce_data, local),
318 {:ok, object} <- add_announce_to_object(activity, object),
319 :ok <- maybe_federate(activity) do
320 {:ok, activity, object}
322 error -> {:error, error}
332 with %Activity{} = announce_activity <- get_existing_announce(actor.ap_id, object),
333 unannounce_data <- make_unannounce_data(actor, announce_activity, activity_id),
334 {:ok, unannounce_activity} <- insert(unannounce_data, local),
335 :ok <- maybe_federate(unannounce_activity),
336 {:ok, _activity} <- Repo.delete(announce_activity),
337 {:ok, object} <- remove_announce_from_object(announce_activity, object) do
338 {:ok, unannounce_activity, object}
344 def follow(follower, followed, activity_id \\ nil, local \\ true) do
345 with data <- make_follow_data(follower, followed, activity_id),
346 {:ok, activity} <- insert(data, local),
347 :ok <- maybe_federate(activity) do
352 def unfollow(follower, followed, activity_id \\ nil, local \\ true) do
353 with %Activity{} = follow_activity <- fetch_latest_follow(follower, followed),
354 {:ok, follow_activity} <- update_follow_state(follow_activity, "cancelled"),
355 unfollow_data <- make_unfollow_data(follower, followed, follow_activity, activity_id),
356 {:ok, activity} <- insert(unfollow_data, local),
357 :ok <- maybe_federate(activity) do
362 def delete(%Object{data: %{"id" => id, "actor" => actor}} = object, local \\ true) do
363 user = User.get_cached_by_ap_id(actor)
364 to = (object.data["to"] || []) ++ (object.data["cc"] || [])
366 with {:ok, object, activity} <- Object.delete(object),
372 "deleted_activity_id" => activity && activity.id
374 {:ok, activity} <- insert(data, local),
375 _ <- decrease_replies_count_if_reply(object),
376 # Changing note count prior to enqueuing federation task in order to avoid
377 # race conditions on updating user.info
378 {:ok, _actor} <- decrease_note_count_if_public(user, object),
379 :ok <- maybe_federate(activity) do
384 def block(blocker, blocked, activity_id \\ nil, local \\ true) do
385 ap_config = Application.get_env(:pleroma, :activitypub)
386 unfollow_blocked = Keyword.get(ap_config, :unfollow_blocked)
387 outgoing_blocks = Keyword.get(ap_config, :outgoing_blocks)
389 with true <- unfollow_blocked do
390 follow_activity = fetch_latest_follow(blocker, blocked)
392 if follow_activity do
393 unfollow(blocker, blocked, nil, local)
397 with true <- outgoing_blocks,
398 block_data <- make_block_data(blocker, blocked, activity_id),
399 {:ok, activity} <- insert(block_data, local),
400 :ok <- maybe_federate(activity) do
407 def unblock(blocker, blocked, activity_id \\ nil, local \\ true) do
408 with %Activity{} = block_activity <- fetch_latest_block(blocker, blocked),
409 unblock_data <- make_unblock_data(blocker, blocked, block_activity, activity_id),
410 {:ok, activity} <- insert(unblock_data, local),
411 :ok <- maybe_federate(activity) do
425 # only accept false as false value
426 local = !(params[:local] == false)
427 forward = !(params[:forward] == false)
429 additional = params[:additional] || %{}
441 Map.merge(additional, %{"to" => [], "cc" => [account.ap_id]})
443 Map.merge(additional, %{"to" => [], "cc" => []})
446 with flag_data <- make_flag_data(params, additional),
447 {:ok, activity} <- insert(flag_data, local),
448 :ok <- maybe_federate(activity) do
449 Enum.each(User.all_superusers(), fn superuser ->
451 |> Pleroma.Emails.AdminEmail.report(actor, account, statuses, content)
452 |> Pleroma.Emails.Mailer.deliver_async()
459 def fetch_activities_for_context(context, opts \\ %{}) do
460 public = ["https://www.w3.org/ns/activitystreams#Public"]
463 if opts["user"], do: [opts["user"].ap_id | opts["user"].following] ++ public, else: public
465 query = from(activity in Activity)
469 |> restrict_blocked(opts)
470 |> restrict_recipients(recipients, opts["user"])
477 "?->>'type' = ? and ?->>'context' = ?",
483 order_by: [desc: :id]
485 |> Activity.with_preloaded_object()
490 def fetch_public_activities(opts \\ %{}) do
491 q = fetch_activities_query(["https://www.w3.org/ns/activitystreams#Public"], opts)
494 |> restrict_unlisted()
495 |> Pagination.fetch_paginated(opts)
499 @valid_visibilities ~w[direct unlisted public private]
501 defp restrict_visibility(query, %{visibility: visibility})
502 when is_list(visibility) do
503 if Enum.all?(visibility, &(&1 in @valid_visibilities)) do
509 "activity_visibility(?, ?, ?) = ANY (?)",
517 Ecto.Adapters.SQL.to_sql(:all, Repo, query)
521 Logger.error("Could not restrict visibility to #{visibility}")
525 defp restrict_visibility(query, %{visibility: visibility})
526 when visibility in @valid_visibilities do
531 fragment("activity_visibility(?, ?, ?) = ?", a.actor, a.recipients, a.data, ^visibility)
534 Ecto.Adapters.SQL.to_sql(:all, Repo, query)
539 defp restrict_visibility(_query, %{visibility: visibility})
540 when visibility not in @valid_visibilities do
541 Logger.error("Could not restrict visibility to #{visibility}")
544 defp restrict_visibility(query, _visibility), do: query
546 def fetch_user_activities(user, reading_user, params \\ %{}) do
549 |> Map.put("type", ["Create", "Announce"])
550 |> Map.put("actor_id", user.ap_id)
551 |> Map.put("whole_db", true)
552 |> Map.put("pinned_activity_ids", user.info.pinned_activities)
556 ["https://www.w3.org/ns/activitystreams#Public"] ++
557 [reading_user.ap_id | reading_user.following]
559 ["https://www.w3.org/ns/activitystreams#Public"]
562 fetch_activities(recipients, params)
566 defp restrict_since(query, %{"since_id" => ""}), do: query
568 defp restrict_since(query, %{"since_id" => since_id}) do
569 from(activity in query, where: activity.id > ^since_id)
572 defp restrict_since(query, _), do: query
574 defp restrict_tag_reject(_query, %{"tag_reject" => _tag_reject, "skip_preload" => true}) do
575 raise "Can't use the child object without preloading!"
578 defp restrict_tag_reject(query, %{"tag_reject" => tag_reject})
579 when is_list(tag_reject) and tag_reject != [] do
581 [_activity, object] in query,
582 where: fragment("not (?)->'tag' \\?| (?)", object.data, ^tag_reject)
586 defp restrict_tag_reject(query, _), do: query
588 defp restrict_tag_all(_query, %{"tag_all" => _tag_all, "skip_preload" => true}) do
589 raise "Can't use the child object without preloading!"
592 defp restrict_tag_all(query, %{"tag_all" => tag_all})
593 when is_list(tag_all) and tag_all != [] do
595 [_activity, object] in query,
596 where: fragment("(?)->'tag' \\?& (?)", object.data, ^tag_all)
600 defp restrict_tag_all(query, _), do: query
602 defp restrict_tag(_query, %{"tag" => _tag, "skip_preload" => true}) do
603 raise "Can't use the child object without preloading!"
606 defp restrict_tag(query, %{"tag" => tag}) when is_list(tag) do
608 [_activity, object] in query,
609 where: fragment("(?)->'tag' \\?| (?)", object.data, ^tag)
613 defp restrict_tag(query, %{"tag" => tag}) when is_binary(tag) do
615 [_activity, object] in query,
616 where: fragment("(?)->'tag' \\? (?)", object.data, ^tag)
620 defp restrict_tag(query, _), do: query
622 defp restrict_to_cc(query, recipients_to, recipients_cc) do
627 "(?->'to' \\?| ?) or (?->'cc' \\?| ?)",
636 defp restrict_recipients(query, [], _user), do: query
638 defp restrict_recipients(query, recipients, nil) do
639 from(activity in query, where: fragment("? && ?", ^recipients, activity.recipients))
642 defp restrict_recipients(query, recipients, user) do
645 where: fragment("? && ?", ^recipients, activity.recipients),
646 or_where: activity.actor == ^user.ap_id
650 defp restrict_local(query, %{"local_only" => true}) do
651 from(activity in query, where: activity.local == true)
654 defp restrict_local(query, _), do: query
656 defp restrict_actor(query, %{"actor_id" => actor_id}) do
657 from(activity in query, where: activity.actor == ^actor_id)
660 defp restrict_actor(query, _), do: query
662 defp restrict_type(query, %{"type" => type}) when is_binary(type) do
663 from(activity in query, where: fragment("?->>'type' = ?", activity.data, ^type))
666 defp restrict_type(query, %{"type" => type}) do
667 from(activity in query, where: fragment("?->>'type' = ANY(?)", activity.data, ^type))
670 defp restrict_type(query, _), do: query
672 defp restrict_favorited_by(query, %{"favorited_by" => ap_id}) do
675 where: fragment(~s(? <@ (? #> '{"object","likes"}'\)), ^ap_id, activity.data)
679 defp restrict_favorited_by(query, _), do: query
681 defp restrict_media(_query, %{"only_media" => _val, "skip_preload" => true}) do
682 raise "Can't use the child object without preloading!"
685 defp restrict_media(query, %{"only_media" => val}) when val == "true" or val == "1" do
687 [_activity, object] in query,
688 where: fragment("not (?)->'attachment' = (?)", object.data, ^[])
692 defp restrict_media(query, _), do: query
694 defp restrict_replies(query, %{"exclude_replies" => val}) when val == "true" or val == "1" do
697 where: fragment("?->'object'->>'inReplyTo' is null", activity.data)
701 defp restrict_replies(query, _), do: query
703 defp restrict_reblogs(query, %{"exclude_reblogs" => val}) when val == "true" or val == "1" do
704 from(activity in query, where: fragment("?->>'type' != 'Announce'", activity.data))
707 defp restrict_reblogs(query, _), do: query
709 defp restrict_muted(query, %{"with_muted" => val}) when val in [true, "true", "1"], do: query
711 defp restrict_muted(query, %{"muting_user" => %User{info: info}}) do
716 where: fragment("not (? = ANY(?))", activity.actor, ^mutes),
717 where: fragment("not (?->'to' \\?| ?)", activity.data, ^mutes)
721 defp restrict_muted(query, _), do: query
723 defp restrict_blocked(query, %{"blocking_user" => %User{info: info}}) do
724 blocks = info.blocks || []
725 domain_blocks = info.domain_blocks || []
729 where: fragment("not (? = ANY(?))", activity.actor, ^blocks),
730 where: fragment("not (? && ?)", activity.recipients, ^blocks),
733 "not (?->>'type' = 'Announce' and ?->'to' \\?| ?)",
738 where: fragment("not (split_part(?, '/', 3) = ANY(?))", activity.actor, ^domain_blocks)
742 defp restrict_blocked(query, _), do: query
744 defp restrict_unlisted(query) do
749 "not (coalesce(?->'cc', '{}'::jsonb) \\?| ?)",
751 ^["https://www.w3.org/ns/activitystreams#Public"]
756 defp restrict_pinned(query, %{"pinned" => "true", "pinned_activity_ids" => ids}) do
757 from(activity in query, where: activity.id in ^ids)
760 defp restrict_pinned(query, _), do: query
762 defp restrict_muted_reblogs(query, %{"muting_user" => %User{info: info}}) do
763 muted_reblogs = info.muted_reblogs || []
769 "not ( ?->>'type' = 'Announce' and ? = ANY(?))",
777 defp restrict_muted_reblogs(query, _), do: query
779 defp maybe_preload_objects(query, %{"skip_preload" => true}), do: query
781 defp maybe_preload_objects(query, _) do
783 |> Activity.with_preloaded_object()
786 def fetch_activities_query(recipients, opts \\ %{}) do
787 base_query = from(activity in Activity)
790 |> maybe_preload_objects(opts)
791 |> restrict_recipients(recipients, opts["user"])
792 |> restrict_tag(opts)
793 |> restrict_tag_reject(opts)
794 |> restrict_tag_all(opts)
795 |> restrict_since(opts)
796 |> restrict_local(opts)
797 |> restrict_actor(opts)
798 |> restrict_type(opts)
799 |> restrict_favorited_by(opts)
800 |> restrict_blocked(opts)
801 |> restrict_muted(opts)
802 |> restrict_media(opts)
803 |> restrict_visibility(opts)
804 |> restrict_replies(opts)
805 |> restrict_reblogs(opts)
806 |> restrict_pinned(opts)
807 |> restrict_muted_reblogs(opts)
810 def fetch_activities(recipients, opts \\ %{}) do
811 fetch_activities_query(recipients, opts)
812 |> Pagination.fetch_paginated(opts)
816 def fetch_activities_bounded(recipients_to, recipients_cc, opts \\ %{}) do
817 fetch_activities_query([], opts)
818 |> restrict_to_cc(recipients_to, recipients_cc)
819 |> Pagination.fetch_paginated(opts)
823 def upload(file, opts \\ []) do
824 with {:ok, data} <- Upload.store(file, opts) do
827 Map.put(data, "actor", opts[:actor])
832 Repo.insert(%Object{data: obj_data})
836 def user_data_from_user_object(data) do
838 data["icon"]["url"] &&
841 "url" => [%{"href" => data["icon"]["url"]}]
845 data["image"]["url"] &&
848 "url" => [%{"href" => data["image"]["url"]}]
851 locked = data["manuallyApprovesFollowers"] || false
852 data = Transmogrifier.maybe_fix_user_object(data)
857 "ap_enabled" => true,
858 "source_data" => data,
864 follower_address: data["followers"],
868 # nickname can be nil because of virtual actors
870 if data["preferredUsername"] do
874 "#{data["preferredUsername"]}@#{URI.parse(data["id"]).host}"
877 Map.put(user_data, :nickname, nil)
883 def fetch_and_prepare_user_from_ap_id(ap_id) do
884 with {:ok, data} <- Fetcher.fetch_and_contain_remote_object_from_id(ap_id) do
885 user_data_from_user_object(data)
887 e -> Logger.error("Could not decode user at fetch #{ap_id}, #{inspect(e)}")
891 def make_user_from_ap_id(ap_id) do
892 if _user = User.get_by_ap_id(ap_id) do
893 Transmogrifier.upgrade_user_from_ap_id(ap_id)
895 with {:ok, data} <- fetch_and_prepare_user_from_ap_id(ap_id) do
896 User.insert_or_update_user(data)
903 def make_user_from_nickname(nickname) do
904 with {:ok, %{"ap_id" => ap_id}} when not is_nil(ap_id) <- WebFinger.finger(nickname) do
905 make_user_from_ap_id(ap_id)
907 _e -> {:error, "No AP id in WebFinger"}
911 def should_federate?(inbox, public) do
915 inbox_info = URI.parse(inbox)
916 !Enum.member?(Pleroma.Config.get([:instance, :quarantined_instances], []), inbox_info.host)
920 def publish(actor, activity) do
922 if actor.follower_address in activity.recipients do
923 {:ok, followers} = User.get_followers(actor)
924 followers |> Enum.filter(&(!&1.local))
929 public = is_public?(activity)
931 {:ok, data} = Transmogrifier.prepare_outgoing(activity.data)
932 json = Jason.encode!(data)
934 (Pleroma.Web.Salmon.remote_users(activity) ++ remote_followers)
935 |> Enum.filter(fn user -> User.ap_enabled?(user) end)
936 |> Enum.map(fn %{info: %{source_data: data}} ->
937 (is_map(data["endpoints"]) && Map.get(data["endpoints"], "sharedInbox")) || data["inbox"]
940 |> Enum.filter(fn inbox -> should_federate?(inbox, public) end)
941 |> Instances.filter_reachable()
942 |> Enum.each(fn {inbox, unreachable_since} ->
943 Federator.publish_single_ap(%{
947 id: activity.data["id"],
948 unreachable_since: unreachable_since
953 def publish_one(%{inbox: inbox, json: json, actor: actor, id: id} = params) do
954 Logger.info("Federating #{id} to #{inbox}")
955 host = URI.parse(inbox).host
957 digest = "SHA-256=" <> (:crypto.hash(:sha256, json) |> Base.encode64())
960 NaiveDateTime.utc_now()
961 |> Timex.format!("{WDshort}, {0D} {Mshort} {YYYY} {h24}:{m}:{s} GMT")
964 Pleroma.Web.HTTPSignatures.sign(actor, %{
966 "content-length": byte_size(json),
971 with {:ok, %{status: code}} when code in 200..299 <-
977 {"Content-Type", "application/activity+json"},
979 {"signature", signature},
983 if !Map.has_key?(params, :unreachable_since) || params[:unreachable_since],
984 do: Instances.set_reachable(inbox)
988 {_post_result, response} ->
989 unless params[:unreachable_since], do: Instances.set_unreachable(inbox)
994 # filter out broken threads
995 def contain_broken_threads(%Activity{} = activity, %User{} = user) do
996 entire_thread_visible_for_user?(activity, user)
999 # do post-processing on a specific activity
1000 def contain_activity(%Activity{} = activity, %User{} = user) do
1001 contain_broken_threads(activity, user)
1004 # do post-processing on a timeline
1005 def contain_timeline(timeline, user) do
1007 |> Enum.filter(fn activity ->
1008 contain_activity(activity, user)