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	diff --git a/lib/pleroma/web/activity_pub/activity_pub.ex b/lib/pleroma/web/activity_pub/activity_pub.ex
	index ace230804..0eb5829ef 100644
	--- a/lib/pleroma/web/activity_pub/activity_pub.ex
	+++ b/lib/pleroma/web/activity_pub/activity_pub.ex
	@@ -1,526 +1,526 @@
	defmodule Pleroma.Web.ActivityPub.ActivityPub do
	alias Pleroma.{Activity, Repo, Object, Upload, User, Notification}
	alias Pleroma.Web.ActivityPub.Transmogrifier
	alias Pleroma.Web.WebFinger
	alias Pleroma.Web.Federator
	alias Pleroma.Web.OStatus
	import Ecto.Query
	import Pleroma.Web.ActivityPub.Utils
	require Logger

	@httpoison Application.get_env(:pleroma, :httpoison)

	def get_recipients(data) do
	(data["to"] \|\| []) ++ (data["cc"] \|\| [])
	end

	def insert(map, local \\ true) when is_map(map) do
	with nil <- Activity.get_by_ap_id(map["id"]),
	map <- lazy_put_activity_defaults(map),
	:ok <- insert_full_object(map) do
	{:ok, activity} =
	Repo.insert(%Activity{
	data: map,
	local: local,
	actor: map["actor"],
	recipients: get_recipients(map)
	})

	Notification.create_notifications(activity)
	stream_out(activity)
	{:ok, activity}
	else
	%Activity{} = activity -> {:ok, activity}
	error -> {:error, error}
	end
	end

	def stream_out(activity) do
	if activity.data["type"] in ["Create", "Announce"] do
	Pleroma.Web.Streamer.stream("user", activity)

	if Enum.member?(activity.data["to"], "https://www.w3.org/ns/activitystreams#Public") do
	Pleroma.Web.Streamer.stream("public", activity)

	if activity.local do
	Pleroma.Web.Streamer.stream("public:local", activity)
	end
	end
	end
	end

	def create(%{to: to, actor: actor, context: context, object: object} = params) do
	additional = params[:additional] \|\| %{}
	# only accept false as false value
	local = !(params[:local] == false)
	published = params[:published]

	with create_data <-
	make_create_data(
	%{to: to, actor: actor, published: published, context: context, object: object},
	additional
	),
	{:ok, activity} <- insert(create_data, local),
	:ok <- maybe_federate(activity) do
	{:ok, activity}
	end
	end

	def accept(%{to: to, actor: actor, object: object} = params) do
	# only accept false as false value
	local = !(params[:local] == false)

	with data <- %{"to" => to, "type" => "Accept", "actor" => actor, "object" => object},
	{:ok, activity} <- insert(data, local),
	:ok <- maybe_federate(activity) do
	{:ok, activity}
	end
	end

	def update(%{to: to, cc: cc, actor: actor, object: object} = params) do
	# only accept false as false value
	local = !(params[:local] == false)

	with data <- %{
	"to" => to,
	"cc" => cc,
	"type" => "Update",
	"actor" => actor,
	"object" => object
	},
	{:ok, activity} <- insert(data, local),
	:ok <- maybe_federate(activity) do
	{:ok, activity}
	end
	end

	# TODO: This is weird, maybe we shouldn't check here if we can make the activity.
	def like(
	%User{ap_id: ap_id} = user,
	%Object{data: %{"id" => _}} = object,
	activity_id \\ nil,
	local \\ true
	) do
	with nil <- get_existing_like(ap_id, object),
	like_data <- make_like_data(user, object, activity_id),
	{:ok, activity} <- insert(like_data, local),
	{:ok, object} <- add_like_to_object(activity, object),
	:ok <- maybe_federate(activity) do
	{:ok, activity, object}
	else
	%Activity{} = activity -> {:ok, activity, object}
	error -> {:error, error}
	end
	end

	def unlike(%User{} = actor, %Object{} = object) do
	with %Activity{} = activity <- get_existing_like(actor.ap_id, object),
	{:ok, _activity} <- Repo.delete(activity),
	{:ok, object} <- remove_like_from_object(activity, object) do
	{:ok, object}
	else
	_e -> {:ok, object}
	end
	end

	def announce(
	%User{ap_id: _} = user,
	%Object{data: %{"id" => _}} = object,
	activity_id \\ nil,
	local \\ true
	) do
	with true <- is_public?(object),
	announce_data <- make_announce_data(user, object, activity_id),
	{:ok, activity} <- insert(announce_data, local),
	{:ok, object} <- add_announce_to_object(activity, object),
	:ok <- maybe_federate(activity) do
	{:ok, activity, object}
	else
	error -> {:error, error}
	end
	end

	def unannounce(%User{} = actor, %Object{} = object, local \\ true) do
	with %Activity{} = activity <- get_existing_announce(actor.ap_id, object),
	- unannounce_data <- make_unannounce_data(actor, activity),
	+ unannounce_data <- make_undo_data(actor, activity),
	{:ok, unannounce_activity} <- insert(unannounce_data, local),
	:ok <- maybe_federate(activity),
	{:ok, _activity} <- Repo.delete(activity),
	{:ok, object} <- remove_announce_from_object(activity, object) do
	{:ok, unannounce_activity, activity, object}
	else
	_e -> {:ok, object}
	end
	end

	def follow(follower, followed, activity_id \\ nil, local \\ true) do
	with data <- make_follow_data(follower, followed, activity_id),
	{:ok, activity} <- insert(data, local),
	:ok <- maybe_federate(activity) do
	{:ok, activity}
	end
	end

	def unfollow(follower, followed, local \\ true) do
	with %Activity{} = follow_activity <- fetch_latest_follow(follower, followed),
	unfollow_data <- make_unfollow_data(follower, followed, follow_activity),
	{:ok, activity} <- insert(unfollow_data, local),
	:ok,
	maybe_federate(activity) do
	{:ok, activity}
	end
	end

	def delete(%Object{data: %{"id" => id, "actor" => actor}} = object, local \\ true) do
	user = User.get_cached_by_ap_id(actor)

	data = %{
	"type" => "Delete",
	"actor" => actor,
	"object" => id,
	"to" => [user.follower_address, "https://www.w3.org/ns/activitystreams#Public"]
	}

	with Repo.delete(object),
	Repo.delete_all(Activity.all_non_create_by_object_ap_id_q(id)),
	{:ok, activity} <- insert(data, local),
	:ok <- maybe_federate(activity) do
	{:ok, activity}
	end
	end

	def fetch_activities_for_context(context, opts \\ %{}) do
	public = ["https://www.w3.org/ns/activitystreams#Public"]

	recipients =
	if opts["user"], do: [opts["user"].ap_id \| opts["user"].following] ++ public, else: public

	query = from(activity in Activity)

	query =
	query
	\|> restrict_blocked(opts)
	\|> restrict_recipients(recipients, opts["user"])

	query =
	from(
	activity in query,
	where:
	fragment(
	"?->>'type' = ? and ?->>'context' = ?",
	activity.data,
	"Create",
	activity.data,
	^context
	),
	order_by: [desc: :id]
	)

	Repo.all(query)
	end

	# TODO: Make this work properly with unlisted.
	def fetch_public_activities(opts \\ %{}) do
	q = fetch_activities_query(["https://www.w3.org/ns/activitystreams#Public"], opts)

	q
	\|> Repo.all()
	\|> Enum.reverse()
	end

	defp restrict_since(query, %{"since_id" => since_id}) do
	from(activity in query, where: activity.id > ^since_id)
	end

	defp restrict_since(query, _), do: query

	defp restrict_tag(query, %{"tag" => tag}) do
	from(
	activity in query,
	where: fragment("? <@ (? #> '{\"object\",\"tag\"}')", ^tag, activity.data)
	)
	end

	defp restrict_tag(query, _), do: query

	defp restrict_recipients(query, [], user), do: query

	defp restrict_recipients(query, recipients, nil) do
	from(activity in query, where: fragment("? && ?", ^recipients, activity.recipients))
	end

	defp restrict_recipients(query, recipients, user) do
	from(
	activity in query,
	where: fragment("? && ?", ^recipients, activity.recipients),
	or_where: activity.actor == ^user.ap_id
	)
	end

	defp restrict_limit(query, %{"limit" => limit}) do
	from(activity in query, limit: ^limit)
	end

	defp restrict_limit(query, _), do: query

	defp restrict_local(query, %{"local_only" => true}) do
	from(activity in query, where: activity.local == true)
	end

	defp restrict_local(query, _), do: query

	defp restrict_max(query, %{"max_id" => max_id}) do
	from(activity in query, where: activity.id < ^max_id)
	end

	defp restrict_max(query, _), do: query

	defp restrict_actor(query, %{"actor_id" => actor_id}) do
	from(activity in query, where: activity.actor == ^actor_id)
	end

	defp restrict_actor(query, _), do: query

	defp restrict_type(query, %{"type" => type}) when is_binary(type) do
	restrict_type(query, %{"type" => [type]})
	end

	defp restrict_type(query, %{"type" => type}) do
	from(activity in query, where: fragment("?->>'type' = ANY(?)", activity.data, ^type))
	end

	defp restrict_type(query, _), do: query

	defp restrict_favorited_by(query, %{"favorited_by" => ap_id}) do
	from(
	activity in query,
	where: fragment("? <@ (? #> '{\"object\",\"likes\"}')", ^ap_id, activity.data)
	)
	end

	defp restrict_favorited_by(query, _), do: query

	defp restrict_media(query, %{"only_media" => val}) when val == "true" or val == "1" do
	from(
	activity in query,
	where: fragment("not (? #> '{\"object\",\"attachment\"}' = ?)", activity.data, ^[])
	)
	end

	defp restrict_media(query, _), do: query

	# Only search through last 100_000 activities by default
	defp restrict_recent(query, %{"whole_db" => true}), do: query

	defp restrict_recent(query, _) do
	since = (Repo.aggregate(Activity, :max, :id) \|\| 0) - 100_000

	from(activity in query, where: activity.id > ^since)
	end

	defp restrict_blocked(query, %{"blocking_user" => %User{info: info}}) do
	blocks = info["blocks"] \|\| []
	from(activity in query, where: fragment("not (? = ANY(?))", activity.actor, ^blocks))
	end

	defp restrict_blocked(query, _), do: query

	def fetch_activities_query(recipients, opts \\ %{}) do
	base_query =
	from(
	activity in Activity,
	limit: 20,
	order_by: [fragment("? desc nulls last", activity.id)]
	)

	base_query
	\|> restrict_recipients(recipients, opts["user"])
	\|> restrict_tag(opts)
	\|> restrict_since(opts)
	\|> restrict_local(opts)
	\|> restrict_limit(opts)
	\|> restrict_max(opts)
	\|> restrict_actor(opts)
	\|> restrict_type(opts)
	\|> restrict_favorited_by(opts)
	\|> restrict_recent(opts)
	\|> restrict_blocked(opts)
	\|> restrict_media(opts)
	end

	def fetch_activities(recipients, opts \\ %{}) do
	fetch_activities_query(recipients, opts)
	\|> Repo.all()
	\|> Enum.reverse()
	end

	def upload(file) do
	data = Upload.store(file)
	Repo.insert(%Object{data: data})
	end

	def user_data_from_user_object(data) do
	avatar =
	data["icon"]["url"] &&
	%{
	"type" => "Image",
	"url" => [%{"href" => data["icon"]["url"]}]
	}

	banner =
	data["image"]["url"] &&
	%{
	"type" => "Image",
	"url" => [%{"href" => data["image"]["url"]}]
	}

	user_data = %{
	ap_id: data["id"],
	info: %{
	"ap_enabled" => true,
	"source_data" => data,
	"banner" => banner
	},
	avatar: avatar,
	nickname: "#{data["preferredUsername"]}@#{URI.parse(data["id"]).host}",
	name: data["name"],
	follower_address: data["followers"],
	bio: data["summary"]
	}

	{:ok, user_data}
	end

	def fetch_and_prepare_user_from_ap_id(ap_id) do
	with {:ok, %{status_code: 200, body: body}} <-
	@httpoison.get(ap_id, Accept: "application/activity+json"),
	{:ok, data} <- Jason.decode(body) do
	user_data_from_user_object(data)
	else
	e -> Logger.error("Could not decode user at fetch #{ap_id}, #{inspect(e)}")
	end
	end

	def make_user_from_ap_id(ap_id) do
	if user = User.get_by_ap_id(ap_id) do
	Transmogrifier.upgrade_user_from_ap_id(ap_id)
	else
	with {:ok, data} <- fetch_and_prepare_user_from_ap_id(ap_id) do
	User.insert_or_update_user(data)
	else
	e -> {:error, e}
	end
	end
	end

	def make_user_from_nickname(nickname) do
	with {:ok, %{"ap_id" => ap_id}} when not is_nil(ap_id) <- WebFinger.finger(nickname) do
	make_user_from_ap_id(ap_id)
	else
	_e -> {:error, "No AP id in WebFinger"}
	end
	end

	def publish(actor, activity) do
	followers =
	if actor.follower_address in activity.recipients do
	{:ok, followers} = User.get_followers(actor)
	followers \|> Enum.filter(&(!&1.local))
	else
	[]
	end

	remote_inboxes =
	(Pleroma.Web.Salmon.remote_users(activity) ++ followers)
	\|> Enum.filter(fn user -> User.ap_enabled?(user) end)
	\|> Enum.map(fn %{info: %{"source_data" => data}} ->
	(data["endpoints"] && data["endpoints"]["sharedInbox"]) \|\| data["inbox"]
	end)
	\|> Enum.uniq()

	{:ok, data} = Transmogrifier.prepare_outgoing(activity.data)
	json = Jason.encode!(data)

	Enum.each(remote_inboxes, fn inbox ->
	Federator.enqueue(:publish_single_ap, %{
	inbox: inbox,
	json: json,
	actor: actor,
	id: activity.data["id"]
	})
	end)
	end

	def publish_one(%{inbox: inbox, json: json, actor: actor, id: id}) do
	Logger.info("Federating #{id} to #{inbox}")
	host = URI.parse(inbox).host

	signature =
	Pleroma.Web.HTTPSignatures.sign(actor, %{host: host, "content-length": byte_size(json)})

	@httpoison.post(
	inbox,
	json,
	[{"Content-Type", "application/activity+json"}, {"signature", signature}],
	hackney: [pool: :default]
	)
	end

	# TODO:
	# This will create a Create activity, which we need internally at the moment.
	def fetch_object_from_id(id) do
	if object = Object.get_cached_by_ap_id(id) do
	{:ok, object}
	else
	Logger.info("Fetching #{id} via AP")

	with true <- String.starts_with?(id, "http"),
	{:ok, %{body: body, status_code: code}} when code in 200..299 <-
	@httpoison.get(
	id,
	[Accept: "application/activity+json"],
	follow_redirect: true,
	timeout: 10000,
	recv_timeout: 20000
	),
	{:ok, data} <- Jason.decode(body),
	nil <- Object.get_by_ap_id(data["id"]),
	params <- %{
	"type" => "Create",
	"to" => data["to"],
	"cc" => data["cc"],
	"actor" => data["attributedTo"],
	"object" => data
	},
	{:ok, activity} <- Transmogrifier.handle_incoming(params) do
	{:ok, Object.get_by_ap_id(activity.data["object"]["id"])}
	else
	object = %Object{} ->
	{:ok, object}

	e ->
	Logger.info("Couldn't get object via AP, trying out OStatus fetching...")

	case OStatus.fetch_activity_from_url(id) do
	{:ok, [activity \| _]} -> {:ok, Object.get_by_ap_id(activity.data["object"]["id"])}
	e -> e
	end
	end
	end
	end

	def is_public?(activity) do
	"https://www.w3.org/ns/activitystreams#Public" in (activity.data["to"] ++
	(activity.data["cc"] \|\| []))
	end

	def visible_for_user?(activity, nil) do
	is_public?(activity)
	end

	def visible_for_user?(activity, user) do
	x = [user.ap_id \| user.following]
	y = activity.data["to"] ++ (activity.data["cc"] \|\| [])
	visible_for_user?(activity, nil) \|\| Enum.any?(x, &(&1 in y))
	end
	end
	diff --git a/lib/pleroma/web/activity_pub/utils.ex b/lib/pleroma/web/activity_pub/utils.ex
	index 9e2fa1fb2..d2a421ea4 100644
	--- a/lib/pleroma/web/activity_pub/utils.ex
	+++ b/lib/pleroma/web/activity_pub/utils.ex
	@@ -1,336 +1,336 @@
	defmodule Pleroma.Web.ActivityPub.Utils do
	alias Pleroma.{Repo, Web, Object, Activity, User}
	alias Pleroma.Web.Router.Helpers
	alias Pleroma.Web.Endpoint
	alias Ecto.{Changeset, UUID}
	import Ecto.Query

	def make_json_ld_header do
	%{
	"@context" => [
	"https://www.w3.org/ns/activitystreams",
	"https://w3id.org/security/v1",
	%{
	"manuallyApprovesFollowers" => "as:manuallyApprovesFollowers",
	"sensitive" => "as:sensitive",
	"Hashtag" => "as:Hashtag",
	"ostatus" => "http://ostatus.org#",
	"atomUri" => "ostatus:atomUri",
	"inReplyToAtomUri" => "ostatus:inReplyToAtomUri",
	"conversation" => "ostatus:conversation",
	"toot" => "http://joinmastodon.org/ns#",
	"Emoji" => "toot:Emoji"
	}
	]
	}
	end

	def make_date do
	DateTime.utc_now() \|> DateTime.to_iso8601()
	end

	def generate_activity_id do
	generate_id("activities")
	end

	def generate_context_id do
	generate_id("contexts")
	end

	def generate_object_id do
	Helpers.o_status_url(Endpoint, :object, UUID.generate())
	end

	def generate_id(type) do
	"#{Web.base_url()}/#{type}/#{UUID.generate()}"
	end

	def create_context(context) do
	context = context \|\| generate_id("contexts")
	changeset = Object.context_mapping(context)

	case Repo.insert(changeset) do
	{:ok, object} ->
	object

	# This should be solved by an upsert, but it seems ecto
	# has problems accessing the constraint inside the jsonb.
	{:error, _} ->
	Object.get_cached_by_ap_id(context)
	end
	end

	@doc """
	Enqueues an activity for federation if it's local
	"""
	def maybe_federate(%Activity{local: true} = activity) do
	priority =
	case activity.data["type"] do
	"Delete" -> 10
	"Create" -> 1
	_ -> 5
	end

	Pleroma.Web.Federator.enqueue(:publish, activity, priority)
	:ok
	end

	def maybe_federate(_), do: :ok

	@doc """
	Adds an id and a published data if they aren't there,
	also adds it to an included object
	"""
	def lazy_put_activity_defaults(map) do
	%{data: %{"id" => context}, id: context_id} = create_context(map["context"])

	map =
	map
	\|> Map.put_new_lazy("id", &generate_activity_id/0)
	\|> Map.put_new_lazy("published", &make_date/0)
	\|> Map.put_new("context", context)
	\|> Map.put_new("context_id", context_id)

	if is_map(map["object"]) do
	object = lazy_put_object_defaults(map["object"], map)
	%{map \| "object" => object}
	else
	map
	end
	end

	@doc """
	Adds an id and published date if they aren't there.
	"""
	def lazy_put_object_defaults(map, activity \\ %{}) do
	map
	\|> Map.put_new_lazy("id", &generate_object_id/0)
	\|> Map.put_new_lazy("published", &make_date/0)
	\|> Map.put_new("context", activity["context"])
	\|> Map.put_new("context_id", activity["context_id"])
	end

	@doc """
	Inserts a full object if it is contained in an activity.
	"""
	def insert_full_object(%{"object" => %{"type" => type} = object_data})
	when is_map(object_data) and type in ["Note"] do
	with {:ok, _} <- Object.create(object_data) do
	:ok
	end
	end

	def insert_full_object(_), do: :ok

	def update_object_in_activities(%{data: %{"id" => id}} = object) do
	# TODO
	# Update activities that already had this. Could be done in a seperate process.
	# Alternatively, just don't do this and fetch the current object each time. Most
	# could probably be taken from cache.
	relevant_activities = Activity.all_by_object_ap_id(id)

	Enum.map(relevant_activities, fn activity ->
	new_activity_data = activity.data \|> Map.put("object", object.data)
	changeset = Changeset.change(activity, data: new_activity_data)
	Repo.update(changeset)
	end)
	end

	#### Like-related helpers

	@doc """
	Returns an existing like if a user already liked an object
	"""
	def get_existing_like(actor, %{data: %{"id" => id}}) do
	query =
	from(
	activity in Activity,
	where: fragment("(?)->>'actor' = ?", activity.data, ^actor),
	# this is to use the index
	where:
	fragment(
	"coalesce((?)->'object'->>'id', (?)->>'object') = ?",
	activity.data,
	activity.data,
	^id
	),
	where: fragment("(?)->>'type' = 'Like'", activity.data)
	)

	Repo.one(query)
	end

	def make_like_data(%User{ap_id: ap_id} = actor, %{data: %{"id" => id}} = object, activity_id) do
	data = %{
	"type" => "Like",
	"actor" => ap_id,
	"object" => id,
	"to" => [actor.follower_address, object.data["actor"]],
	"cc" => ["https://www.w3.org/ns/activitystreams#Public"],
	"context" => object.data["context"]
	}

	if activity_id, do: Map.put(data, "id", activity_id), else: data
	end

	def update_element_in_object(property, element, object) do
	with new_data <-
	object.data \|> Map.put("#{property}_count", length(element))
	\|> Map.put("#{property}s", element),
	changeset <- Changeset.change(object, data: new_data),
	{:ok, object} <- Repo.update(changeset),
	_ <- update_object_in_activities(object) do
	{:ok, object}
	end
	end

	def update_likes_in_object(likes, object) do
	update_element_in_object("like", likes, object)
	end

	def add_like_to_object(%Activity{data: %{"actor" => actor}}, object) do
	with likes <- [actor \| object.data["likes"] \|\| []] \|> Enum.uniq() do
	update_likes_in_object(likes, object)
	end
	end

	def remove_like_from_object(%Activity{data: %{"actor" => actor}}, object) do
	with likes <- (object.data["likes"] \|\| []) \|> List.delete(actor) do
	update_likes_in_object(likes, object)
	end
	end

	#### Follow-related helpers

	@doc """
	Makes a follow activity data for the given follower and followed
	"""
	def make_follow_data(%User{ap_id: follower_id}, %User{ap_id: followed_id}, activity_id) do
	data = %{
	"type" => "Follow",
	"actor" => follower_id,
	"to" => [followed_id],
	"cc" => ["https://www.w3.org/ns/activitystreams#Public"],
	"object" => followed_id
	}

	if activity_id, do: Map.put(data, "id", activity_id), else: data
	end

	def fetch_latest_follow(%User{ap_id: follower_id}, %User{ap_id: followed_id}) do
	query =
	from(
	activity in Activity,
	where:
	fragment(
	"? @> ?",
	activity.data,
	^%{type: "Follow", actor: follower_id, object: followed_id}
	),
	order_by: [desc: :id],
	limit: 1
	)

	Repo.one(query)
	end

	#### Announce-related helpers

	@doc """
	Retruns an existing announce activity if the notice has already been announced
	"""
	def get_existing_announce(actor, %{data: %{"id" => id}}) do
	query =
	from(
	activity in Activity,
	where: fragment("(?)->>'actor' = ?", activity.data, ^actor),
	# this is to use the index
	where:
	fragment(
	"coalesce((?)->'object'->>'id', (?)->>'object') = ?",
	activity.data,
	activity.data,
	^id
	),
	where: fragment("(?)->>'type' = 'Announce'", activity.data)
	)

	Repo.one(query)
	end

	@doc """
	Make announce activity data for the given actor and object
	"""
	def make_announce_data(
	%User{ap_id: ap_id} = user,
	%Object{data: %{"id" => id}} = object,
	activity_id
	) do
	data = %{
	"type" => "Announce",
	"actor" => ap_id,
	"object" => id,
	"to" => [user.follower_address, object.data["actor"]],
	"cc" => ["https://www.w3.org/ns/activitystreams#Public"],
	"context" => object.data["context"]
	}

	if activity_id, do: Map.put(data, "id", activity_id), else: data
	end

	@doc """
	- Make unannounce activity data for the given actor and object
	+ Make undo activity data for the given actor and object
	"""
	- def make_unannounce_data(
	+ def make_undo_data(
	%User{ap_id: ap_id} = user,
	%Activity{data: %{"id" => id, "context" => context}} = activity
	) do
	%{
	"type" => "Undo",
	"actor" => ap_id,
	"object" => id,
	"to" => [user.follower_address, activity.data["actor"]],
	"cc" => ["https://www.w3.org/ns/activitystreams#Public"],
	"context" => context
	}
	end

	def add_announce_to_object(%Activity{data: %{"actor" => actor}}, object) do
	with announcements <- [actor \| object.data["announcements"] \|\| []] \|> Enum.uniq() do
	update_element_in_object("announcement", announcements, object)
	end
	end

	def remove_announce_from_object(%Activity{data: %{"actor" => actor}}, object) do
	with announcements <- (object.data["announcements"] \|\| []) \|> List.delete(actor) do
	update_element_in_object("announcement", announcements, object)
	end
	end

	#### Unfollow-related helpers

	def make_unfollow_data(follower, followed, follow_activity) do
	%{
	"type" => "Undo",
	"actor" => follower.ap_id,
	"to" => [followed.ap_id],
	"object" => follow_activity.data["id"]
	}
	end

	#### Create-related helpers

	def make_create_data(params, additional) do
	published = params.published \|\| make_date()

	%{
	"type" => "Create",
	"to" => params.to \|> Enum.uniq(),
	"actor" => params.actor.ap_id,
	"object" => params.object,
	"published" => published,
	"context" => params.context
	}
	\|> Map.merge(additional)
	end
	end

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