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.Utils do
9 alias Pleroma.Notification
14 alias Pleroma.Web.ActivityPub.Visibility
15 alias Pleroma.Web.Endpoint
16 alias Pleroma.Web.Router.Helpers
21 require Pleroma.Constants
23 @supported_object_types ["Article", "Note", "Video", "Page", "Question", "Answer"]
24 @supported_report_states ~w(open closed resolved)
25 @valid_visibilities ~w(public unlisted private direct)
27 # Some implementations send the actor URI as the actor field, others send the entire actor object,
28 # so figure out what the actor's URI is based on what we have.
29 def get_ap_id(%{"id" => id} = _), do: id
30 def get_ap_id(id), do: id
32 def normalize_params(params) do
33 Map.put(params, "actor", get_ap_id(params["actor"]))
36 def determine_explicit_mentions(%{"tag" => tag} = _object) when is_list(tag) do
38 |> Enum.filter(fn x -> is_map(x) end)
39 |> Enum.filter(fn x -> x["type"] == "Mention" end)
40 |> Enum.map(fn x -> x["href"] end)
43 def determine_explicit_mentions(%{"tag" => tag} = object) when is_map(tag) do
44 Map.put(object, "tag", [tag])
45 |> determine_explicit_mentions()
48 def determine_explicit_mentions(_), do: []
50 defp recipient_in_collection(ap_id, coll) when is_binary(coll), do: ap_id == coll
51 defp recipient_in_collection(ap_id, coll) when is_list(coll), do: ap_id in coll
52 defp recipient_in_collection(_, _), do: false
54 def recipient_in_message(%User{ap_id: ap_id} = recipient, %User{} = actor, params) do
56 recipient_in_collection(ap_id, params["to"]) ->
59 recipient_in_collection(ap_id, params["cc"]) ->
62 recipient_in_collection(ap_id, params["bto"]) ->
65 recipient_in_collection(ap_id, params["bcc"]) ->
68 # if the message is unaddressed at all, then assume it is directly addressed
70 !params["to"] && !params["cc"] && !params["bto"] && !params["bcc"] ->
73 # if the message is sent from somebody the user is following, then assume it
74 # is addressed to the recipient
75 User.following?(recipient, actor) ->
83 defp extract_list(target) when is_binary(target), do: [target]
84 defp extract_list(lst) when is_list(lst), do: lst
85 defp extract_list(_), do: []
87 def maybe_splice_recipient(ap_id, params) do
89 !recipient_in_collection(ap_id, params["to"]) &&
90 !recipient_in_collection(ap_id, params["cc"])
93 cc_list = extract_list(params["cc"])
94 Map.put(params, "cc", [ap_id | cc_list])
100 def make_json_ld_header do
103 "https://www.w3.org/ns/activitystreams",
104 "#{Web.base_url()}/schemas/litepub-0.1.jsonld",
113 DateTime.utc_now() |> DateTime.to_iso8601()
116 def generate_activity_id do
117 generate_id("activities")
120 def generate_context_id do
121 generate_id("contexts")
124 def generate_object_id do
125 Helpers.o_status_url(Endpoint, :object, UUID.generate())
128 def generate_id(type) do
129 "#{Web.base_url()}/#{type}/#{UUID.generate()}"
132 def get_notified_from_object(%{"type" => type} = object) when type in @supported_object_types do
133 fake_create_activity = %{
134 "to" => object["to"],
135 "cc" => object["cc"],
140 get_notified_from_object(fake_create_activity)
143 def get_notified_from_object(object) do
144 Notification.get_notified_from_activity(%Activity{data: object}, false)
147 def create_context(context) do
148 context = context || generate_id("contexts")
150 # Ecto has problems accessing the constraint inside the jsonb,
151 # so we explicitly check for the existed object before insert
152 object = Object.get_cached_by_ap_id(context)
154 with true <- is_nil(object),
155 changeset <- Object.context_mapping(context),
156 {:ok, inserted_object} <- Repo.insert(changeset) do
165 Enqueues an activity for federation if it's local
167 @spec maybe_federate(any()) :: :ok
168 def maybe_federate(%Activity{local: true} = activity) do
169 if Pleroma.Config.get!([:instance, :federating]) do
171 case activity.data["type"] do
177 Pleroma.Web.Federator.publish(activity, priority)
183 def maybe_federate(_), do: :ok
186 Adds an id and a published data if they aren't there,
187 also adds it to an included object
189 def lazy_put_activity_defaults(map, fake? \\ false) do
192 %{data: %{"id" => context}, id: context_id} = create_context(map["context"])
195 |> Map.put_new_lazy("id", &generate_activity_id/0)
196 |> Map.put_new_lazy("published", &make_date/0)
197 |> Map.put_new("context", context)
198 |> Map.put_new("context_id", context_id)
201 |> Map.put_new("id", "pleroma:fakeid")
202 |> Map.put_new_lazy("published", &make_date/0)
203 |> Map.put_new("context", "pleroma:fakecontext")
204 |> Map.put_new("context_id", -1)
207 if is_map(map["object"]) do
208 object = lazy_put_object_defaults(map["object"], map, fake?)
209 %{map | "object" => object}
216 Adds an id and published date if they aren't there.
218 def lazy_put_object_defaults(map, activity \\ %{}, fake?)
220 def lazy_put_object_defaults(map, activity, true = _fake?) do
222 |> Map.put_new_lazy("published", &make_date/0)
223 |> Map.put_new("id", "pleroma:fake_object_id")
224 |> Map.put_new("context", activity["context"])
225 |> Map.put_new("fake", true)
226 |> Map.put_new("context_id", activity["context_id"])
229 def lazy_put_object_defaults(map, activity, _fake?) do
231 |> Map.put_new_lazy("id", &generate_object_id/0)
232 |> Map.put_new_lazy("published", &make_date/0)
233 |> Map.put_new("context", activity["context"])
234 |> Map.put_new("context_id", activity["context_id"])
238 Inserts a full object if it is contained in an activity.
240 def insert_full_object(%{"object" => %{"type" => type} = object_data} = map)
241 when is_map(object_data) and type in @supported_object_types do
242 with {:ok, object} <- Object.create(object_data) do
243 map = Map.put(map, "object", object.data["id"])
249 def insert_full_object(map), do: {:ok, map, nil}
251 #### Like-related helpers
254 Returns an existing like if a user already liked an object
256 @spec get_existing_like(String.t(), map()) :: Activity.t() | nil
257 def get_existing_like(actor, %{data: %{"id" => id}}) do
259 |> Activity.Queries.by_actor()
260 |> Activity.Queries.by_object_id(id)
261 |> Activity.Queries.by_type("Like")
267 Returns like activities targeting an object
269 def get_object_likes(%{data: %{"id" => id}}) do
271 |> Activity.Queries.by_object_id()
272 |> Activity.Queries.by_type("Like")
276 @spec make_like_data(User.t(), map(), String.t()) :: map()
278 %User{ap_id: ap_id} = actor,
279 %{data: %{"actor" => object_actor_id, "id" => id}} = object,
282 object_actor = User.get_cached_by_ap_id(object_actor_id)
285 if Visibility.is_public?(object) do
286 [actor.follower_address, object.data["actor"]]
288 [object.data["actor"]]
292 (object.data["to"] ++ (object.data["cc"] || []))
293 |> List.delete(actor.ap_id)
294 |> List.delete(object_actor.follower_address)
302 "context" => object.data["context"]
304 |> maybe_put("id", activity_id)
307 @spec update_element_in_object(String.t(), list(any), Object.t()) ::
308 {:ok, Object.t()} | {:error, Ecto.Changeset.t()}
309 def update_element_in_object(property, element, object) do
313 %{"#{property}_count" => length(element), "#{property}s" => element}
317 |> Changeset.change(data: data)
318 |> Object.update_and_set_cache()
321 @spec add_like_to_object(Activity.t(), Object.t()) ::
322 {:ok, Object.t()} | {:error, Ecto.Changeset.t()}
323 def add_like_to_object(%Activity{data: %{"actor" => actor}}, object) do
324 [actor | fetch_likes(object)]
326 |> update_likes_in_object(object)
329 @spec remove_like_from_object(Activity.t(), Object.t()) ::
330 {:ok, Object.t()} | {:error, Ecto.Changeset.t()}
331 def remove_like_from_object(%Activity{data: %{"actor" => actor}}, object) do
334 |> List.delete(actor)
335 |> update_likes_in_object(object)
338 defp update_likes_in_object(likes, object) do
339 update_element_in_object("like", likes, object)
342 defp fetch_likes(object) do
343 if is_list(object.data["likes"]) do
350 #### Follow-related helpers
353 Updates a follow activity's state (for locked accounts).
355 def update_follow_state_for_all(
356 %Activity{data: %{"actor" => actor, "object" => object}} = activity,
360 Ecto.Adapters.SQL.query!(
362 "UPDATE activities SET data = jsonb_set(data, '{state}', $1) WHERE data->>'type' = 'Follow' AND data->>'actor' = $2 AND data->>'object' = $3 AND data->>'state' = 'pending'",
363 [state, actor, object]
366 User.set_follow_state_cache(actor, object, state)
367 activity = Activity.get_by_id(activity.id)
375 def update_follow_state(
376 %Activity{data: %{"actor" => actor, "object" => object}} = activity,
379 new_data = Map.put(activity.data, "state", state)
380 changeset = Changeset.change(activity, data: new_data)
382 with {:ok, activity} <- Repo.update(changeset) do
383 User.set_follow_state_cache(actor, object, state)
389 Makes a follow activity data for the given follower and followed
391 def make_follow_data(
392 %User{ap_id: follower_id},
393 %User{ap_id: followed_id} = _followed,
398 "actor" => follower_id,
399 "to" => [followed_id],
400 "cc" => [Pleroma.Constants.as_public()],
401 "object" => followed_id,
404 |> maybe_put("id", activity_id)
407 def fetch_latest_follow(%User{ap_id: follower_id}, %User{ap_id: followed_id}) do
409 |> Activity.Queries.by_type()
410 |> where(actor: ^follower_id)
411 # this is to use the index
412 |> Activity.Queries.by_object_id(followed_id)
413 |> order_by([activity], fragment("? desc nulls last", activity.id))
418 #### Announce-related helpers
421 Retruns an existing announce activity if the notice has already been announced
423 def get_existing_announce(actor, %{data: %{"id" => ap_id}}) do
425 |> Activity.Queries.by_type()
426 |> where(actor: ^actor)
427 # this is to use the index
428 |> Activity.Queries.by_object_id(ap_id)
433 Make announce activity data for the given actor and object
435 # for relayed messages, we only want to send to subscribers
436 def make_announce_data(
437 %User{ap_id: ap_id} = user,
438 %Object{data: %{"id" => id}} = object,
443 "type" => "Announce",
446 "to" => [user.follower_address],
448 "context" => object.data["context"]
450 |> maybe_put("id", activity_id)
453 def make_announce_data(
454 %User{ap_id: ap_id} = user,
455 %Object{data: %{"id" => id}} = object,
460 "type" => "Announce",
463 "to" => [user.follower_address, object.data["actor"]],
464 "cc" => [Pleroma.Constants.as_public()],
465 "context" => object.data["context"]
467 |> maybe_put("id", activity_id)
471 Make unannounce activity data for the given actor and object
473 def make_unannounce_data(
474 %User{ap_id: ap_id} = user,
475 %Activity{data: %{"context" => context, "object" => object}} = activity,
478 object = Object.normalize(object)
483 "object" => activity.data,
484 "to" => [user.follower_address, object.data["actor"]],
485 "cc" => [Pleroma.Constants.as_public()],
488 |> maybe_put("id", activity_id)
491 def make_unlike_data(
492 %User{ap_id: ap_id} = user,
493 %Activity{data: %{"context" => context, "object" => object}} = activity,
496 object = Object.normalize(object)
501 "object" => activity.data,
502 "to" => [user.follower_address, object.data["actor"]],
503 "cc" => [Pleroma.Constants.as_public()],
506 |> maybe_put("id", activity_id)
509 def add_announce_to_object(
511 data: %{"actor" => actor, "cc" => [Pleroma.Constants.as_public()]}
516 if is_list(object.data["announcements"]) do
517 Enum.uniq([actor | object.data["announcements"]])
522 update_element_in_object("announcement", announcements, object)
525 def add_announce_to_object(_, object), do: {:ok, object}
527 def remove_announce_from_object(%Activity{data: %{"actor" => actor}}, object) do
529 if is_list(object.data["announcements"]), do: object.data["announcements"], else: []
531 with announcements <- announcements |> List.delete(actor) do
532 update_element_in_object("announcement", announcements, object)
536 #### Unfollow-related helpers
538 def make_unfollow_data(follower, followed, follow_activity, activity_id) do
541 "actor" => follower.ap_id,
542 "to" => [followed.ap_id],
543 "object" => follow_activity.data
545 |> maybe_put("id", activity_id)
548 #### Block-related helpers
549 def fetch_latest_block(%User{ap_id: blocker_id}, %User{ap_id: blocked_id}) do
551 |> Activity.Queries.by_type()
552 |> where(actor: ^blocker_id)
553 # this is to use the index
554 |> Activity.Queries.by_object_id(blocked_id)
555 |> order_by([activity], fragment("? desc nulls last", activity.id))
560 def make_block_data(blocker, blocked, activity_id) do
563 "actor" => blocker.ap_id,
564 "to" => [blocked.ap_id],
565 "object" => blocked.ap_id
567 |> maybe_put("id", activity_id)
570 def make_unblock_data(blocker, blocked, block_activity, activity_id) do
573 "actor" => blocker.ap_id,
574 "to" => [blocked.ap_id],
575 "object" => block_activity.data
577 |> maybe_put("id", activity_id)
580 #### Create-related helpers
582 def make_create_data(params, additional) do
583 published = params.published || make_date()
587 "to" => params.to |> Enum.uniq(),
588 "actor" => params.actor.ap_id,
589 "object" => params.object,
590 "published" => published,
591 "context" => params.context
593 |> Map.merge(additional)
596 #### Flag-related helpers
598 def make_flag_data(params, additional) do
600 Enum.map(params.statuses || [], fn
601 %Activity{} = act -> act.data["id"]
602 act when is_map(act) -> act["id"]
603 act when is_binary(act) -> act
606 object = [params.account.ap_id] ++ status_ap_ids
610 "actor" => params.actor.ap_id,
611 "content" => params.content,
613 "context" => params.context,
616 |> Map.merge(additional)
620 Fetches the OrderedCollection/OrderedCollectionPage from `from`, limiting the amount of pages fetched after
621 the first one to `pages_left` pages.
622 If the amount of pages is higher than the collection has, it returns whatever was there.
624 def fetch_ordered_collection(from, pages_left, acc \\ []) do
625 with {:ok, response} <- Tesla.get(from),
626 {:ok, collection} <- Jason.decode(response.body) do
627 case collection["type"] do
628 "OrderedCollection" ->
629 # If we've encountered the OrderedCollection and not the page,
630 # just call the same function on the page address
631 fetch_ordered_collection(collection["first"], pages_left)
633 "OrderedCollectionPage" ->
635 # There are still more pages
636 if Map.has_key?(collection, "next") do
637 # There are still more pages, go deeper saving what we have into the accumulator
638 fetch_ordered_collection(
641 acc ++ collection["orderedItems"]
644 # No more pages left, just return whatever we already have
645 acc ++ collection["orderedItems"]
648 # Got the amount of pages needed, add them all to the accumulator
649 acc ++ collection["orderedItems"]
653 {:error, "Not an OrderedCollection or OrderedCollectionPage"}
658 #### Report-related helpers
660 def update_report_state(%Activity{} = activity, state) when state in @supported_report_states do
661 new_data = Map.put(activity.data, "state", state)
664 |> Changeset.change(data: new_data)
668 def update_report_state(_, _), do: {:error, "Unsupported state"}
670 def update_activity_visibility(activity, visibility) when visibility in @valid_visibilities do
671 [to, cc, recipients] =
673 |> get_updated_targets(visibility)
674 |> Enum.map(&Enum.uniq/1)
683 |> Object.change(%{data: object_data})
684 |> Object.update_and_set_cache()
692 |> Map.put(:object, object)
693 |> Activity.change(%{data: activity_data, recipients: recipients})
697 def update_activity_visibility(_, _), do: {:error, "Unsupported visibility"}
699 defp get_updated_targets(
700 %Activity{data: %{"to" => to} = data, recipients: recipients},
703 cc = Map.get(data, "cc", [])
704 follower_address = User.get_cached_by_ap_id(data["actor"]).follower_address
705 public = Pleroma.Constants.as_public()
709 to = [public | List.delete(to, follower_address)]
710 cc = [follower_address | List.delete(cc, public)]
711 recipients = [public | recipients]
715 to = [follower_address | List.delete(to, public)]
716 cc = List.delete(cc, public)
717 recipients = List.delete(recipients, public)
721 to = [follower_address | List.delete(to, public)]
722 cc = [public | List.delete(cc, follower_address)]
723 recipients = recipients ++ [follower_address, public]
731 def get_existing_votes(actor, %{data: %{"id" => id}}) do
733 |> Activity.Queries.by_actor()
734 |> Activity.Queries.by_type("Create")
735 |> Activity.with_preloaded_object()
736 |> where([a, object: o], fragment("(?)->>'inReplyTo' = ?", o.data, ^to_string(id)))
737 |> where([a, object: o], fragment("(?)->>'type' = 'Answer'", o.data))
741 defp maybe_put(map, _key, nil), do: map
742 defp maybe_put(map, key, value), do: Map.put(map, key, value)