1 # Pleroma: A lightweight social networking server
2 # Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
3 # SPDX-License-Identifier: AGPL-3.0-only
5 defmodule Pleroma.Web.ActivityPub.Transmogrifier do
7 A module to handle coding from internal to wire ActivityPub and back.
10 alias Pleroma.EctoType.ActivityPub.ObjectValidators
13 alias Pleroma.Object.Containment
16 alias Pleroma.Web.ActivityPub.ActivityPub
17 alias Pleroma.Web.ActivityPub.Builder
18 alias Pleroma.Web.ActivityPub.ObjectValidator
19 alias Pleroma.Web.ActivityPub.Pipeline
20 alias Pleroma.Web.ActivityPub.Utils
21 alias Pleroma.Web.ActivityPub.Visibility
22 alias Pleroma.Web.Federator
23 alias Pleroma.Workers.TransmogrifierWorker
28 require Pleroma.Constants
31 Modifies an incoming AP object (mastodon format) to our internal format.
33 def fix_object(object, options \\ []) do
35 |> strip_internal_fields()
40 |> fix_in_reply_to(options)
48 def fix_summary(%{"summary" => nil} = object) do
49 Map.put(object, "summary", "")
52 def fix_summary(%{"summary" => _} = object) do
53 # summary is present, nothing to do
57 def fix_summary(object), do: Map.put(object, "summary", "")
59 def fix_addressing_list(map, field) do
64 Map.put(map, field, Enum.filter(addrs, &is_binary/1))
67 Map.put(map, field, [addrs])
70 Map.put(map, field, [])
74 # if directMessage flag is set to true, leave the addressing alone
75 def fix_explicit_addressing(%{"directMessage" => true} = object, _follower_collection),
78 def fix_explicit_addressing(%{"to" => to, "cc" => cc} = object, follower_collection) do
80 Utils.determine_explicit_mentions(object) ++
81 [Pleroma.Constants.as_public(), follower_collection]
83 explicit_to = Enum.filter(to, fn x -> x in explicit_mentions end)
84 explicit_cc = Enum.filter(to, fn x -> x not in explicit_mentions end)
89 |> Enum.reject(fn x -> String.ends_with?(x, "/followers") and x != follower_collection end)
93 |> Map.put("to", explicit_to)
94 |> Map.put("cc", final_cc)
97 # if as:Public is addressed, then make sure the followers collection is also addressed
98 # so that the activities will be delivered to local users.
99 def fix_implicit_addressing(%{"to" => to, "cc" => cc} = object, followers_collection) do
100 recipients = to ++ cc
102 if followers_collection not in recipients do
104 Pleroma.Constants.as_public() in cc ->
105 to = to ++ [followers_collection]
106 Map.put(object, "to", to)
108 Pleroma.Constants.as_public() in to ->
109 cc = cc ++ [followers_collection]
110 Map.put(object, "cc", cc)
120 def fix_addressing(object) do
121 {:ok, %User{follower_address: follower_collection}} =
123 |> Containment.get_actor()
124 |> User.get_or_fetch_by_ap_id()
127 |> fix_addressing_list("to")
128 |> fix_addressing_list("cc")
129 |> fix_addressing_list("bto")
130 |> fix_addressing_list("bcc")
131 |> fix_explicit_addressing(follower_collection)
132 |> fix_implicit_addressing(follower_collection)
135 def fix_actor(%{"attributedTo" => actor} = object) do
136 actor = Containment.get_actor(%{"actor" => actor})
138 # TODO: Remove actor field for Objects
140 |> Map.put("actor", actor)
141 |> Map.put("attributedTo", actor)
144 def fix_in_reply_to(object, options \\ [])
146 def fix_in_reply_to(%{"inReplyTo" => in_reply_to} = object, options)
147 when not is_nil(in_reply_to) do
148 in_reply_to_id = prepare_in_reply_to(in_reply_to)
149 depth = (options[:depth] || 0) + 1
151 if Federator.allowed_thread_distance?(depth) do
152 with {:ok, replied_object} <- get_obj_helper(in_reply_to_id, options),
153 %Activity{} <- Activity.get_create_by_object_ap_id(replied_object.data["id"]) do
155 |> Map.put("inReplyTo", replied_object.data["id"])
156 |> Map.put("context", replied_object.data["context"] || object["conversation"])
157 |> Map.drop(["conversation", "inReplyToAtomUri"])
160 Logger.warn("Couldn't fetch #{inspect(in_reply_to_id)}, error: #{inspect(e)}")
168 def fix_in_reply_to(object, _options), do: object
170 defp prepare_in_reply_to(in_reply_to) do
172 is_bitstring(in_reply_to) ->
175 is_map(in_reply_to) && is_bitstring(in_reply_to["id"]) ->
178 is_list(in_reply_to) && is_bitstring(Enum.at(in_reply_to, 0)) ->
179 Enum.at(in_reply_to, 0)
186 def fix_context(object) do
187 context = object["context"] || object["conversation"] || Utils.generate_context_id()
190 |> Map.put("context", context)
191 |> Map.drop(["conversation"])
194 def fix_attachments(%{"attachment" => attachment} = object) when is_list(attachment) do
196 Enum.map(attachment, fn data ->
199 is_list(data["url"]) -> List.first(data["url"])
200 is_map(data["url"]) -> data["url"]
206 is_map(url) && MIME.extensions(url["mediaType"]) != [] ->
209 is_bitstring(data["mediaType"]) && MIME.extensions(data["mediaType"]) != [] ->
212 is_bitstring(data["mimeType"]) && MIME.extensions(data["mimeType"]) != [] ->
221 is_map(url) && is_binary(url["href"]) -> url["href"]
222 is_binary(data["url"]) -> data["url"]
223 is_binary(data["href"]) -> data["href"]
231 "type" => Map.get(url || %{}, "type", "Link")
233 |> Maps.put_if_present("mediaType", media_type)
234 |> Maps.put_if_present("width", (url || %{})["width"] || data["width"])
235 |> Maps.put_if_present("height", (url || %{})["height"] || data["height"])
238 "url" => [attachment_url],
239 "type" => data["type"] || "Document"
241 |> Maps.put_if_present("mediaType", media_type)
242 |> Maps.put_if_present("name", data["name"])
243 |> Maps.put_if_present("blurhash", data["blurhash"])
250 Map.put(object, "attachment", attachments)
253 def fix_attachments(%{"attachment" => attachment} = object) when is_map(attachment) do
255 |> Map.put("attachment", [attachment])
259 def fix_attachments(object), do: object
261 def fix_url(%{"url" => url} = object) when is_map(url) do
262 Map.put(object, "url", url["href"])
265 def fix_url(%{"url" => url} = object) when is_list(url) do
266 first_element = Enum.at(url, 0)
270 is_bitstring(first_element) -> first_element
271 is_map(first_element) -> first_element["href"] || ""
275 Map.put(object, "url", url_string)
278 def fix_url(object), do: object
280 def fix_emoji(%{"tag" => tags} = object) when is_list(tags) do
283 |> Enum.filter(fn data -> is_map(data) and data["type"] == "Emoji" and data["icon"] end)
284 |> Enum.reduce(%{}, fn data, mapping ->
285 name = String.trim(data["name"], ":")
287 Map.put(mapping, name, data["icon"]["url"])
290 Map.put(object, "emoji", emoji)
293 def fix_emoji(%{"tag" => %{"type" => "Emoji"} = tag} = object) do
294 name = String.trim(tag["name"], ":")
295 emoji = %{name => tag["icon"]["url"]}
297 Map.put(object, "emoji", emoji)
300 def fix_emoji(object), do: object
302 def fix_tag(%{"tag" => tag} = object) when is_list(tag) do
305 |> Enum.filter(fn data -> data["type"] == "Hashtag" and data["name"] end)
307 %{"name" => "#" <> hashtag} -> String.downcase(hashtag)
308 %{"name" => hashtag} -> String.downcase(hashtag)
311 Map.put(object, "tag", tag ++ tags)
314 def fix_tag(%{"tag" => %{} = tag} = object) do
316 |> Map.put("tag", [tag])
320 def fix_tag(object), do: object
322 # content map usually only has one language so this will do for now.
323 def fix_content_map(%{"contentMap" => content_map} = object) do
324 content_groups = Map.to_list(content_map)
325 {_, content} = Enum.at(content_groups, 0)
327 Map.put(object, "content", content)
330 def fix_content_map(object), do: object
332 defp fix_type(%{"type" => "Note", "inReplyTo" => reply_id, "name" => _} = object, options)
333 when is_binary(reply_id) do
334 options = Keyword.put(options, :fetch, true)
336 with %Object{data: %{"type" => "Question"}} <- Object.normalize(reply_id, options) do
337 Map.put(object, "type", "Answer")
343 defp fix_type(object, _options), do: object
345 # Reduce the object list to find the reported user.
346 defp get_reported(objects) do
347 Enum.reduce_while(objects, nil, fn ap_id, _ ->
348 with %User{} = user <- User.get_cached_by_ap_id(ap_id) do
356 def handle_incoming(data, options \\ [])
358 # Flag objects are placed ahead of the ID check because Mastodon 2.8 and earlier send them
360 def handle_incoming(%{"type" => "Flag", "object" => objects, "actor" => actor} = data, _options) do
361 with context <- data["context"] || Utils.generate_context_id(),
362 content <- data["content"] || "",
363 %User{} = actor <- User.get_cached_by_ap_id(actor),
364 # Reduce the object list to find the reported user.
365 %User{} = account <- get_reported(objects),
366 # Remove the reported user from the object list.
367 statuses <- Enum.filter(objects, fn ap_id -> ap_id != account.ap_id end) do
374 additional: %{"cc" => [account.ap_id]}
376 |> ActivityPub.flag()
380 # disallow objects with bogus IDs
381 def handle_incoming(%{"id" => nil}, _options), do: :error
382 def handle_incoming(%{"id" => ""}, _options), do: :error
383 # length of https:// = 8, should validate better, but good enough for now.
384 def handle_incoming(%{"id" => id}, _options) when is_binary(id) and byte_size(id) < 8,
387 @doc "Rewrite misskey likes into EmojiReacts"
391 "_misskey_reaction" => reaction,
397 |> Map.put("type", "EmojiReact")
398 |> Map.put("content", reaction)
399 |> handle_incoming(options)
405 "_misskey_reaction" => reaction
410 |> Map.put("type", "EmojiReact")
411 |> Map.put("content", reaction)
412 |> handle_incoming(options)
416 %{"type" => "Create", "object" => %{"type" => objtype, "id" => obj_id}} = data,
419 when objtype in ~w{Question Answer Audio Video Event Article Note Page} do
420 fetch_options = Keyword.put(options, :depth, (options[:depth] || 0) + 1)
424 |> strip_internal_fields()
425 |> fix_type(fetch_options)
426 |> fix_in_reply_to(fetch_options)
428 data = Map.put(data, "object", object)
429 options = Keyword.put(options, :local, false)
431 with {:ok, %User{}} <- ObjectValidator.fetch_actor(data),
432 nil <- Activity.get_create_by_object_ap_id(obj_id),
433 {:ok, activity, _} <- Pipeline.common_pipeline(data, options) do
436 %Activity{} = activity -> {:ok, activity}
441 def handle_incoming(%{"type" => type} = data, _options)
442 when type in ~w{Like EmojiReact Announce Add Remove} do
443 with :ok <- ObjectValidator.fetch_actor_and_object(data),
444 {:ok, activity, _meta} <- Pipeline.common_pipeline(data, local: false) do
453 %{"type" => type} = data,
456 when type in ~w{Update Block Follow Accept Reject} do
457 with {:ok, %User{}} <- ObjectValidator.fetch_actor(data),
458 {:ok, activity, _} <-
459 Pipeline.common_pipeline(data, local: false) do
465 %{"type" => "Delete"} = data,
468 with {:ok, activity, _} <-
469 Pipeline.common_pipeline(data, local: false) do
472 {:error, {:validate, _}} = e ->
473 # Check if we have a create activity for this
474 with {:ok, object_id} <- ObjectValidators.ObjectID.cast(data["object"]),
475 %Activity{data: %{"actor" => actor}} <-
476 Activity.create_by_object_ap_id(object_id) |> Repo.one(),
477 # We have one, insert a tombstone and retry
478 {:ok, tombstone_data, _} <- Builder.tombstone(actor, object_id),
479 {:ok, _tombstone} <- Object.create(tombstone_data) do
480 handle_incoming(data)
490 "object" => %{"type" => "Follow", "object" => followed},
496 with %User{local: true} = followed <- User.get_cached_by_ap_id(followed),
497 {:ok, %User{} = follower} <- User.get_or_fetch_by_ap_id(follower),
498 {:ok, activity} <- ActivityPub.unfollow(follower, followed, id, false) do
499 User.unfollow(follower, followed)
509 "object" => %{"type" => type}
513 when type in ["Like", "EmojiReact", "Announce", "Block"] do
514 with {:ok, activity, _} <- Pipeline.common_pipeline(data, local: false) do
519 # For Undos that don't have the complete object attached, try to find it in our database.
527 when is_binary(object) do
528 with %Activity{data: data} <- Activity.get_by_ap_id(object) do
530 |> Map.put("object", data)
531 |> handle_incoming(options)
540 "actor" => origin_actor,
541 "object" => origin_actor,
542 "target" => target_actor
546 with %User{} = origin_user <- User.get_cached_by_ap_id(origin_actor),
547 {:ok, %User{} = target_user} <- User.get_or_fetch_by_ap_id(target_actor),
548 true <- origin_actor in target_user.also_known_as do
549 ActivityPub.move(origin_user, target_user, false)
555 def handle_incoming(_, _), do: :error
557 @spec get_obj_helper(String.t(), Keyword.t()) :: {:ok, Object.t()} | nil
558 def get_obj_helper(id, options \\ []) do
559 options = Keyword.put(options, :fetch, true)
561 case Object.normalize(id, options) do
562 %Object{} = object -> {:ok, object}
567 @spec get_embedded_obj_helper(String.t() | Object.t(), User.t()) :: {:ok, Object.t()} | nil
568 def get_embedded_obj_helper(%{"attributedTo" => attributed_to, "id" => object_id} = data, %User{
571 when attributed_to == ap_id do
572 with {:ok, activity} <-
577 "actor" => attributed_to,
580 {:ok, Object.normalize(activity, fetch: false)}
582 _ -> get_obj_helper(object_id)
586 def get_embedded_obj_helper(object_id, _) do
587 get_obj_helper(object_id)
590 def set_reply_to_uri(%{"inReplyTo" => in_reply_to} = object) when is_binary(in_reply_to) do
591 with false <- String.starts_with?(in_reply_to, "http"),
592 {:ok, %{data: replied_to_object}} <- get_obj_helper(in_reply_to) do
593 Map.put(object, "inReplyTo", replied_to_object["external_url"] || in_reply_to)
599 def set_reply_to_uri(obj), do: obj
602 Serialized Mastodon-compatible `replies` collection containing _self-replies_.
603 Based on Mastodon's ActivityPub::NoteSerializer#replies.
605 def set_replies(obj_data) do
607 with limit when limit > 0 <-
608 Pleroma.Config.get([:activitypub, :note_replies_output_limit], 0),
609 %Object{} = object <- Object.get_cached_by_ap_id(obj_data["id"]) do
611 |> Object.self_replies()
612 |> select([o], fragment("?->>'id'", o.data))
619 set_replies(obj_data, replies_uris)
622 defp set_replies(obj, []) do
626 defp set_replies(obj, replies_uris) do
627 replies_collection = %{
628 "type" => "Collection",
629 "items" => replies_uris
632 Map.merge(obj, %{"replies" => replies_collection})
635 def replies(%{"replies" => %{"first" => %{"items" => items}}}) when not is_nil(items) do
639 def replies(%{"replies" => %{"items" => items}}) when not is_nil(items) do
643 def replies(_), do: []
645 # Prepares the object of an outgoing create activity.
646 def prepare_object(object) do
652 |> prepare_attachments
656 |> strip_internal_fields
657 |> strip_internal_tags
663 # internal -> Mastodon
666 def prepare_outgoing(%{"type" => activity_type, "object" => object_id} = data)
667 when activity_type in ["Create"] do
670 |> Object.normalize(fetch: false)
676 |> Map.put("object", object)
677 |> Map.merge(Utils.make_json_ld_header())
683 def prepare_outgoing(%{"type" => "Announce", "actor" => ap_id, "object" => object_id} = data) do
686 |> Object.normalize(fetch: false)
689 if Visibility.is_private?(object) && object.data["actor"] == ap_id do
690 data |> Map.put("object", object |> Map.get(:data) |> prepare_object)
692 data |> maybe_fix_object_url
697 |> strip_internal_fields
698 |> Map.merge(Utils.make_json_ld_header())
704 # Mastodon Accept/Reject requires a non-normalized object containing the actor URIs,
705 # because of course it does.
706 def prepare_outgoing(%{"type" => "Accept"} = data) do
707 with follow_activity <- Activity.normalize(data["object"]) do
709 "actor" => follow_activity.actor,
710 "object" => follow_activity.data["object"],
711 "id" => follow_activity.data["id"],
717 |> Map.put("object", object)
718 |> Map.merge(Utils.make_json_ld_header())
724 def prepare_outgoing(%{"type" => "Reject"} = data) do
725 with follow_activity <- Activity.normalize(data["object"]) do
727 "actor" => follow_activity.actor,
728 "object" => follow_activity.data["object"],
729 "id" => follow_activity.data["id"],
735 |> Map.put("object", object)
736 |> Map.merge(Utils.make_json_ld_header())
742 def prepare_outgoing(%{"type" => _type} = data) do
745 |> strip_internal_fields
746 |> maybe_fix_object_url
747 |> Map.merge(Utils.make_json_ld_header())
752 def maybe_fix_object_url(%{"object" => object} = data) when is_binary(object) do
753 with false <- String.starts_with?(object, "http"),
754 {:fetch, {:ok, relative_object}} <- {:fetch, get_obj_helper(object)},
755 %{data: %{"external_url" => external_url}} when not is_nil(external_url) <-
757 Map.put(data, "object", external_url)
760 Logger.error("Couldn't fetch #{object} #{inspect(e)}")
768 def maybe_fix_object_url(data), do: data
770 def add_hashtags(object) do
772 (object["tag"] || [])
774 # Expand internal representation tags into AS2 tags.
775 tag when is_binary(tag) ->
777 "href" => Pleroma.Web.Endpoint.url() <> "/tags/#{tag}",
782 # Do not process tags which are already AS2 tag objects.
783 tag when is_map(tag) ->
787 Map.put(object, "tag", tags)
790 # TODO These should be added on our side on insertion, it doesn't make much
791 # sense to regenerate these all the time
792 def add_mention_tags(object) do
793 to = object["to"] || []
794 cc = object["cc"] || []
795 mentioned = User.get_users_from_set(to ++ cc, local_only: false)
797 mentions = Enum.map(mentioned, &build_mention_tag/1)
799 tags = object["tag"] || []
800 Map.put(object, "tag", tags ++ mentions)
803 defp build_mention_tag(%{ap_id: ap_id, nickname: nickname} = _) do
804 %{"type" => "Mention", "href" => ap_id, "name" => "@#{nickname}"}
807 def take_emoji_tags(%User{emoji: emoji}) do
810 |> Enum.map(&build_emoji_tag/1)
813 # TODO: we should probably send mtime instead of unix epoch time for updated
814 def add_emoji_tags(%{"emoji" => emoji} = object) do
815 tags = object["tag"] || []
817 out = Enum.map(emoji, &build_emoji_tag/1)
819 Map.put(object, "tag", tags ++ out)
822 def add_emoji_tags(object), do: object
824 defp build_emoji_tag({name, url}) do
826 "icon" => %{"url" => "#{URI.encode(url)}", "type" => "Image"},
827 "name" => ":" <> name <> ":",
829 "updated" => "1970-01-01T00:00:00Z",
834 def set_conversation(object) do
835 Map.put(object, "conversation", object["context"])
838 def set_type(%{"type" => "Answer"} = object) do
839 Map.put(object, "type", "Note")
842 def set_type(object), do: object
844 def add_attributed_to(object) do
845 attributed_to = object["attributedTo"] || object["actor"]
846 Map.put(object, "attributedTo", attributed_to)
849 def prepare_attachments(object) do
852 |> Map.get("attachment", [])
853 |> Enum.map(fn data ->
854 [%{"mediaType" => media_type, "href" => href} = url | _] = data["url"]
858 "mediaType" => media_type,
859 "name" => data["name"],
862 |> Maps.put_if_present("width", url["width"])
863 |> Maps.put_if_present("height", url["height"])
864 |> Maps.put_if_present("blurhash", data["blurhash"])
867 Map.put(object, "attachment", attachments)
870 def strip_internal_fields(object) do
871 Map.drop(object, Pleroma.Constants.object_internal_fields())
874 defp strip_internal_tags(%{"tag" => tags} = object) do
875 tags = Enum.filter(tags, fn x -> is_map(x) end)
877 Map.put(object, "tag", tags)
880 defp strip_internal_tags(object), do: object
882 def perform(:user_upgrade, user) do
883 # we pass a fake user so that the followers collection is stripped away
884 old_follower_address = User.ap_followers(%User{nickname: user.nickname})
888 where: ^old_follower_address in a.recipients,
893 "array_replace(?,?,?)",
895 ^old_follower_address,
896 ^user.follower_address
901 |> Repo.update_all([])
904 def upgrade_user_from_ap_id(ap_id) do
905 with %User{local: false} = user <- User.get_cached_by_ap_id(ap_id),
906 {:ok, data} <- ActivityPub.fetch_and_prepare_user_from_ap_id(ap_id),
907 {:ok, user} <- update_user(user, data) do
908 {:ok, _pid} = Task.start(fn -> ActivityPub.pinned_fetch_task(user) end)
909 TransmogrifierWorker.enqueue("user_upgrade", %{"user_id" => user.id})
912 %User{} = user -> {:ok, user}
917 defp update_user(user, data) do
919 |> User.remote_user_changeset(data)
920 |> User.update_and_set_cache()
923 def maybe_fix_user_url(%{"url" => url} = data) when is_map(url) do
924 Map.put(data, "url", url["href"])
927 def maybe_fix_user_url(data), do: data
929 def maybe_fix_user_object(data), do: maybe_fix_user_url(data)