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akkoma/lib/pleroma/web/activity_pub/utils.ex

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Elixir

# Pleroma: A lightweight social networking server
# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.ActivityPub.Utils do
alias Ecto.Changeset
alias Ecto.UUID
alias Pleroma.Activity
alias Pleroma.Config
alias Pleroma.Maps
alias Pleroma.Notification
alias Pleroma.Object
alias Pleroma.Repo
alias Pleroma.User
alias Pleroma.Web.ActivityPub.ActivityPub
alias Pleroma.Web.ActivityPub.Visibility
alias Pleroma.Web.AdminAPI.AccountView
alias Pleroma.Web.Endpoint
alias Pleroma.Web.Router.Helpers
import Ecto.Query
require Logger
require Pleroma.Constants
@supported_object_types [
"Article",
"Note",
"Event",
"Video",
"Page",
"Question",
"Answer",
"Audio"
]
@strip_status_report_states ~w(closed resolved)
@supported_report_states ~w(open closed resolved)
@valid_visibilities ~w(public unlisted private direct)
def as_local_public, do: Endpoint.url() <> "/#Public"
# Some implementations send the actor URI as the actor field, others send the entire actor object,
# so figure out what the actor's URI is based on what we have.
def get_ap_id(%{"id" => id} = _), do: id
def get_ap_id(id), do: id
def normalize_params(params) do
Map.put(params, "actor", get_ap_id(params["actor"]))
end
@spec determine_explicit_mentions(map()) :: [any]
def determine_explicit_mentions(%{"tag" => tag}) when is_list(tag) do
Enum.flat_map(tag, fn
%{"type" => "Mention", "href" => href} -> [href]
_ -> []
end)
end
def determine_explicit_mentions(%{"tag" => tag} = object) when is_map(tag) do
object
|> Map.put("tag", [tag])
|> determine_explicit_mentions()
end
def determine_explicit_mentions(_), do: []
@spec label_in_collection?(any(), any()) :: boolean()
defp label_in_collection?(ap_id, coll) when is_binary(coll), do: ap_id == coll
defp label_in_collection?(ap_id, coll) when is_list(coll), do: ap_id in coll
defp label_in_collection?(_, _), do: false
@spec label_in_message?(String.t(), map()) :: boolean()
def label_in_message?(label, params),
do:
[params["to"], params["cc"], params["bto"], params["bcc"]]
|> Enum.any?(&label_in_collection?(label, &1))
@spec unaddressed_message?(map()) :: boolean()
def unaddressed_message?(params),
do:
[params["to"], params["cc"], params["bto"], params["bcc"]]
|> Enum.all?(&is_nil(&1))
@spec recipient_in_message(User.t(), User.t(), map()) :: boolean()
def recipient_in_message(%User{ap_id: ap_id} = recipient, %User{} = actor, params),
do:
label_in_message?(ap_id, params) || unaddressed_message?(params) ||
User.following?(recipient, actor)
defp extract_list(target) when is_binary(target), do: [target]
defp extract_list(lst) when is_list(lst), do: lst
defp extract_list(_), do: []
def maybe_splice_recipient(ap_id, params) do
need_splice? =
!label_in_collection?(ap_id, params["to"]) &&
!label_in_collection?(ap_id, params["cc"])
if need_splice? do
cc = [ap_id | extract_list(params["cc"])]
params
|> Map.put("cc", cc)
|> Maps.safe_put_in(["object", "cc"], cc)
else
params
end
end
def make_json_ld_header do
%{
"@context" => [
"https://www.w3.org/ns/activitystreams",
"#{Endpoint.url()}/schemas/litepub-0.1.jsonld",
%{
"@language" => "und"
}
]
}
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
"#{Endpoint.url()}/#{type}/#{UUID.generate()}"
end
def get_notified_from_object(%{"type" => type} = object) when type in @supported_object_types do
fake_create_activity = %{
"to" => object["to"],
"cc" => object["cc"],
"type" => "Create",
"object" => object
}
get_notified_from_object(fake_create_activity)
end
def get_notified_from_object(object) do
Notification.get_notified_from_activity(%Activity{data: object}, false)
end
def create_context(context) do
context = context || generate_id("contexts")
# Ecto has problems accessing the constraint inside the jsonb,
# so we explicitly check for the existed object before insert
object = Object.get_cached_by_ap_id(context)
with true <- is_nil(object),
changeset <- Object.context_mapping(context),
{:ok, inserted_object} <- Repo.insert(changeset) do
inserted_object
else
_ ->
object
end
end
@doc """
Enqueues an activity for federation if it's local
"""
@spec maybe_federate(any()) :: :ok
def maybe_federate(%Activity{local: true, data: %{"type" => type}} = activity) do
outgoing_blocks = Config.get([:activitypub, :outgoing_blocks])
with true <- Config.get!([:instance, :federating]),
true <- type != "Block" || outgoing_blocks,
false <- Visibility.is_local_public?(activity) do
Pleroma.Web.Federator.publish(activity)
end
: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
"""
@spec lazy_put_activity_defaults(map(), boolean) :: map()
def lazy_put_activity_defaults(map, fake? \\ false)
def lazy_put_activity_defaults(map, true) do
map
|> Map.put_new("id", "pleroma:fakeid")
|> Map.put_new_lazy("published", &make_date/0)
|> Map.put_new("context", "pleroma:fakecontext")
|> Map.put_new("context_id", -1)
|> lazy_put_object_defaults(true)
end
def lazy_put_activity_defaults(map, _fake?) do
%{data: %{"id" => context}, id: context_id} = create_context(map["context"])
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)
|> lazy_put_object_defaults(false)
end
# Adds an id and published date if they aren't there.
#
@spec lazy_put_object_defaults(map(), boolean()) :: map()
defp lazy_put_object_defaults(%{"object" => map} = activity, true)
when is_map(map) do
object =
map
|> Map.put_new("id", "pleroma:fake_object_id")
|> Map.put_new_lazy("published", &make_date/0)
|> Map.put_new("context", activity["context"])
|> Map.put_new("context_id", activity["context_id"])
|> Map.put_new("fake", true)
%{activity | "object" => object}
end
defp lazy_put_object_defaults(%{"object" => map} = activity, _)
when is_map(map) do
object =
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"])
%{activity | "object" => object}
end
defp lazy_put_object_defaults(activity, _), do: activity
@doc """
Inserts a full object if it is contained in an activity.
"""
def insert_full_object(%{"object" => %{"type" => type} = object_data} = map)
when type in @supported_object_types do
with {:ok, object} <- Object.create(object_data) do
map = Map.put(map, "object", object.data["id"])
{:ok, map, object}
end
end
def insert_full_object(map), do: {:ok, map, nil}
#### Like-related helpers
@doc """
Returns an existing like if a user already liked an object
"""
@spec get_existing_like(String.t(), map()) :: Activity.t() | nil
def get_existing_like(actor, %{data: %{"id" => id}}) do
actor
|> Activity.Queries.by_actor()
|> Activity.Queries.by_object_id(id)
|> Activity.Queries.by_type("Like")
|> limit(1)
|> Repo.one()
end
@doc """
Returns like activities targeting an object
"""
def get_object_likes(%{data: %{"id" => id}}) do
id
|> Activity.Queries.by_object_id()
|> Activity.Queries.by_type("Like")
|> Repo.all()
end
@spec make_like_data(User.t(), map(), String.t()) :: map()
def make_like_data(
%User{ap_id: ap_id} = actor,
%{data: %{"actor" => object_actor_id, "id" => id}} = object,
activity_id
) do
object_actor = User.get_cached_by_ap_id(object_actor_id)
to =
if Visibility.is_public?(object) do
[actor.follower_address, object.data["actor"]]
else
[object.data["actor"]]
end
cc =
(object.data["to"] ++ (object.data["cc"] || []))
|> List.delete(actor.ap_id)
|> List.delete(object_actor.follower_address)
%{
"type" => "Like",
"actor" => ap_id,
"object" => id,
"to" => to,
"cc" => cc,
"context" => object.data["context"]
}
|> Maps.put_if_present("id", activity_id)
end
def make_emoji_reaction_data(user, object, emoji, activity_id) do
make_like_data(user, object, activity_id)
|> Map.put("type", "EmojiReact")
|> Map.put("content", emoji)
end
@spec update_element_in_object(String.t(), list(any), Object.t(), integer() | nil) ::
{:ok, Object.t()} | {:error, Ecto.Changeset.t()}
def update_element_in_object(property, element, object, count \\ nil) do
length =
count ||
length(element)
data =
Map.merge(
object.data,
%{"#{property}_count" => length, "#{property}s" => element}
)
object
|> Changeset.change(data: data)
|> Object.update_and_set_cache()
end
@spec add_emoji_reaction_to_object(Activity.t(), Object.t()) ::
{:ok, Object.t()} | {:error, Ecto.Changeset.t()}
def add_emoji_reaction_to_object(
%Activity{data: %{"content" => emoji, "actor" => actor}} = activity,
object
) do
IO.inspect(emoji)
reactions = get_cached_emoji_reactions(object)
emoji = stripped_emoji_name(emoji)
new_reactions =
case Enum.find_index(reactions, fn [candidate, _, _] -> emoji == candidate end) do
nil ->
reactions ++ [[emoji, [actor], emoji_url(emoji, activity)]]
index ->
List.update_at(
reactions,
index,
fn [emoji, users, url] -> [emoji, Enum.uniq([actor | users]), url] end
)
end
count = emoji_count(new_reactions)
update_element_in_object("reaction", new_reactions, object, count)
end
defp stripped_emoji_name(name) do
name
|> String.replace_leading(":", "")
|> String.replace_trailing(":", "")
end
defp emoji_url(name,
%Activity{
data: %{"tag" => [
%{"type" => "Emoji", "name" => name, "icon" => %{"url" => url}}
]}
}), do: url
defp emoji_url(_, _), do: nil
def emoji_count(reactions_list) do
Enum.reduce(reactions_list, 0, fn [_, users, _], acc -> acc + length(users) end)
end
def remove_emoji_reaction_from_object(
%Activity{data: %{"content" => emoji, "actor" => actor}},
object
) do
reactions = get_cached_emoji_reactions(object)
new_reactions =
case Enum.find_index(reactions, fn [candidate, _, _] -> emoji == candidate end) do
nil ->
reactions
index ->
List.update_at(
reactions,
index,
fn [emoji, users, url] -> [emoji, List.delete(users, actor), url] end
)
|> Enum.reject(fn [_, users, _] -> Enum.empty?(users) end)
end
count = emoji_count(new_reactions)
update_element_in_object("reaction", new_reactions, object, count)
end
def get_cached_emoji_reactions(object) do
if is_list(object.data["reactions"]) do
object.data["reactions"]
else
[]
end
end
@spec add_like_to_object(Activity.t(), Object.t()) ::
{:ok, Object.t()} | {:error, Ecto.Changeset.t()}
def add_like_to_object(%Activity{data: %{"actor" => actor}}, object) do
[actor | fetch_likes(object)]
|> Enum.uniq()
|> update_likes_in_object(object)
end
@spec remove_like_from_object(Activity.t(), Object.t()) ::
{:ok, Object.t()} | {:error, Ecto.Changeset.t()}
def remove_like_from_object(%Activity{data: %{"actor" => actor}}, object) do
object
|> fetch_likes()
|> List.delete(actor)
|> update_likes_in_object(object)
end
defp update_likes_in_object(likes, object) do
update_element_in_object("like", likes, object)
end
defp fetch_likes(object) do
if is_list(object.data["likes"]) do
object.data["likes"]
else
[]
end
end
#### Follow-related helpers
@doc """
Updates a follow activity's state (for locked accounts).
"""
@spec update_follow_state_for_all(Activity.t(), String.t()) :: {:ok, Activity | nil}
def update_follow_state_for_all(
%Activity{data: %{"actor" => actor, "object" => object}} = activity,
state
) do
"Follow"
|> Activity.Queries.by_type()
|> Activity.Queries.by_actor(actor)
|> Activity.Queries.by_object_id(object)
|> where(fragment("data->>'state' = 'pending'") or fragment("data->>'state' = 'accept'"))
|> update(set: [data: fragment("jsonb_set(data, '{state}', ?)", ^state)])
|> Repo.update_all([])
activity = Activity.get_by_id(activity.id)
{:ok, activity}
end
def update_follow_state(
%Activity{} = activity,
state
) do
new_data = Map.put(activity.data, "state", state)
changeset = Changeset.change(activity, data: new_data)
with {:ok, activity} <- Repo.update(changeset) do
{:ok, activity}
end
end
@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} = _followed,
activity_id
) do
%{
"type" => "Follow",
"actor" => follower_id,
"to" => [followed_id],
"cc" => [Pleroma.Constants.as_public()],
"object" => followed_id,
"state" => "pending"
}
|> Maps.put_if_present("id", activity_id)
end
def fetch_latest_follow(%User{ap_id: follower_id}, %User{ap_id: followed_id}) do
"Follow"
|> Activity.Queries.by_type()
|> where(actor: ^follower_id)
# this is to use the index
|> Activity.Queries.by_object_id(followed_id)
|> order_by([activity], fragment("? desc nulls last", activity.id))
|> limit(1)
|> Repo.one()
end
def fetch_latest_undo(%User{ap_id: ap_id}) do
"Undo"
|> Activity.Queries.by_type()
|> where(actor: ^ap_id)
|> order_by([activity], fragment("? desc nulls last", activity.id))
|> limit(1)
|> Repo.one()
end
def get_latest_reaction(internal_activity_id, %{ap_id: ap_id}, emoji) do
%{data: %{"object" => object_ap_id}} = Activity.get_by_id(internal_activity_id)
"EmojiReact"
|> Activity.Queries.by_type()
|> where(actor: ^ap_id)
|> where([activity], fragment("?->>'content' = ?", activity.data, ^emoji))
|> Activity.Queries.by_object_id(object_ap_id)
|> order_by([activity], fragment("? desc nulls last", activity.id))
|> limit(1)
|> Repo.one()
end
#### Announce-related helpers
@doc """
Returns an existing announce activity if the notice has already been announced
"""
@spec get_existing_announce(String.t(), map()) :: Activity.t() | nil
def get_existing_announce(actor, %{data: %{"id" => ap_id}}) do
"Announce"
|> Activity.Queries.by_type()
|> where(actor: ^actor)
# this is to use the index
|> Activity.Queries.by_object_id(ap_id)
|> Repo.one()
end
@doc """
Make announce activity data for the given actor and object
"""
# for relayed messages, we only want to send to subscribers
def make_announce_data(
%User{ap_id: ap_id} = user,
%Object{data: %{"id" => id}} = object,
activity_id,
false
) do
%{
"type" => "Announce",
"actor" => ap_id,
"object" => id,
"to" => [user.follower_address],
"cc" => [],
"context" => object.data["context"]
}
|> Maps.put_if_present("id", activity_id)
end
def make_announce_data(
%User{ap_id: ap_id} = user,
%Object{data: %{"id" => id}} = object,
activity_id,
true
) do
%{
"type" => "Announce",
"actor" => ap_id,
"object" => id,
"to" => [user.follower_address, object.data["actor"]],
"cc" => [Pleroma.Constants.as_public()],
"context" => object.data["context"]
}
|> Maps.put_if_present("id", activity_id)
end
def make_undo_data(
%User{ap_id: actor, follower_address: follower_address},
%Activity{
data: %{"id" => undone_activity_id, "context" => context},
actor: undone_activity_actor
},
activity_id \\ nil
) do
%{
"type" => "Undo",
"actor" => actor,
"object" => undone_activity_id,
"to" => [follower_address, undone_activity_actor],
"cc" => [Pleroma.Constants.as_public()],
"context" => context
}
|> Maps.put_if_present("id", activity_id)
end
@spec add_announce_to_object(Activity.t(), Object.t()) ::
{:ok, Object.t()} | {:error, Ecto.Changeset.t()}
def add_announce_to_object(
%Activity{data: %{"actor" => actor}},
object
) do
unless actor |> User.get_cached_by_ap_id() |> User.invisible?() do
announcements = take_announcements(object)
with announcements <- Enum.uniq([actor | announcements]) do
update_element_in_object("announcement", announcements, object)
end
else
{:ok, object}
end
end
def add_announce_to_object(_, object), do: {:ok, object}
@spec remove_announce_from_object(Activity.t(), Object.t()) ::
{:ok, Object.t()} | {:error, Ecto.Changeset.t()}
def remove_announce_from_object(%Activity{data: %{"actor" => actor}}, object) do
with announcements <- List.delete(take_announcements(object), actor) do
update_element_in_object("announcement", announcements, object)
end
end
defp take_announcements(%{data: %{"announcements" => announcements}} = _)
when is_list(announcements),
do: announcements
defp take_announcements(_), do: []
#### Unfollow-related helpers
def make_unfollow_data(follower, followed, follow_activity, activity_id) do
%{
"type" => "Undo",
"actor" => follower.ap_id,
"to" => [followed.ap_id],
"object" => follow_activity.data
}
|> Maps.put_if_present("id", activity_id)
end
#### Block-related helpers
@spec fetch_latest_block(User.t(), User.t()) :: Activity.t() | nil
def fetch_latest_block(%User{ap_id: blocker_id}, %User{ap_id: blocked_id}) do
"Block"
|> Activity.Queries.by_type()
|> where(actor: ^blocker_id)
# this is to use the index
|> Activity.Queries.by_object_id(blocked_id)
|> order_by([activity], fragment("? desc nulls last", activity.id))
|> limit(1)
|> Repo.one()
end
def make_block_data(blocker, blocked, activity_id) do
%{
"type" => "Block",
"actor" => blocker.ap_id,
"to" => [blocked.ap_id],
"object" => blocked.ap_id
}
|> Maps.put_if_present("id", activity_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
#### Listen-related helpers
def make_listen_data(params, additional) do
published = params.published || make_date()
%{
"type" => "Listen",
"to" => params.to |> Enum.uniq(),
"actor" => params.actor.ap_id,
"object" => params.object,
"published" => published,
"context" => params.context
}
|> Map.merge(additional)
end
#### Flag-related helpers
@spec make_flag_data(map(), map()) :: map()
def make_flag_data(%{actor: actor, context: context, content: content} = params, additional) do
%{
"type" => "Flag",
"actor" => actor.ap_id,
"content" => content,
"object" => build_flag_object(params),
"context" => context,
"state" => "open"
}
|> Map.merge(additional)
end
def make_flag_data(_, _), do: %{}
defp build_flag_object(%{account: account, statuses: statuses}) do
[account.ap_id | build_flag_object(%{statuses: statuses})]
end
defp build_flag_object(%{statuses: statuses}) do
Enum.map(statuses || [], &build_flag_object/1)
end
defp build_flag_object(%Activity{data: %{"id" => id}, object: %{data: data}}) do
activity_actor = User.get_by_ap_id(data["actor"])
%{
"type" => "Note",
"id" => id,
"content" => data["content"],
"published" => data["published"],
"actor" =>
AccountView.render(
"show.json",
%{user: activity_actor, skip_visibility_check: true}
)
}
end
defp build_flag_object(act) when is_map(act) or is_binary(act) do
id =
case act do
%Activity{} = act -> act.data["id"]
act when is_map(act) -> act["id"]
act when is_binary(act) -> act
end
case Activity.get_by_ap_id_with_object(id) do
%Activity{} = activity ->
build_flag_object(activity)
nil ->
if activity = Activity.get_by_object_ap_id_with_object(id) do
build_flag_object(activity)
else
%{"id" => id, "deleted" => true}
end
end
end
defp build_flag_object(_), do: []
#### Report-related helpers
def get_reports(params, page, page_size) do
params =
params
|> Map.put(:type, "Flag")
|> Map.put(:skip_preload, true)
|> Map.put(:preload_report_notes, true)
|> Map.put(:total, true)
|> Map.put(:limit, page_size)
|> Map.put(:offset, (page - 1) * page_size)
ActivityPub.fetch_activities([], params, :offset)
end
def update_report_state(%Activity{} = activity, state)
when state in @strip_status_report_states do
{:ok, stripped_activity} = strip_report_status_data(activity)
new_data =
activity.data
|> Map.put("state", state)
|> Map.put("object", stripped_activity.data["object"])
activity
|> Changeset.change(data: new_data)
|> Repo.update()
end
def update_report_state(%Activity{} = activity, state) when state in @supported_report_states do
new_data = Map.put(activity.data, "state", state)
activity
|> Changeset.change(data: new_data)
|> Repo.update()
end
def update_report_state(activity_ids, state) when state in @supported_report_states do
activities_num = length(activity_ids)
from(a in Activity, where: a.id in ^activity_ids)
|> update(set: [data: fragment("jsonb_set(data, '{state}', ?)", ^state)])
|> Repo.update_all([])
|> case do
{^activities_num, _} -> :ok
_ -> {:error, activity_ids}
end
end
def update_report_state(_, _), do: {:error, "Unsupported state"}
def strip_report_status_data(activity) do
[actor | reported_activities] = activity.data["object"]
stripped_activities =
Enum.map(reported_activities, fn
act when is_map(act) -> act["id"]
act when is_binary(act) -> act
end)
new_data = put_in(activity.data, ["object"], [actor | stripped_activities])
{:ok, %{activity | data: new_data}}
end
def update_activity_visibility(activity, visibility) when visibility in @valid_visibilities do
[to, cc, recipients] =
activity
|> get_updated_targets(visibility)
|> Enum.map(&Enum.uniq/1)
object_data =
activity.object.data
|> Map.put("to", to)
|> Map.put("cc", cc)
{:ok, object} =
activity.object
|> Object.change(%{data: object_data})
|> Object.update_and_set_cache()
activity_data =
activity.data
|> Map.put("to", to)
|> Map.put("cc", cc)
activity
|> Map.put(:object, object)
|> Activity.change(%{data: activity_data, recipients: recipients})
|> Repo.update()
end
def update_activity_visibility(_, _), do: {:error, "Unsupported visibility"}
defp get_updated_targets(
%Activity{data: %{"to" => to} = data, recipients: recipients},
visibility
) do
cc = Map.get(data, "cc", [])
follower_address = User.get_cached_by_ap_id(data["actor"]).follower_address
public = Pleroma.Constants.as_public()
case visibility do
"public" ->
to = [public | List.delete(to, follower_address)]
cc = [follower_address | List.delete(cc, public)]
recipients = [public | recipients]
[to, cc, recipients]
"private" ->
to = [follower_address | List.delete(to, public)]
cc = List.delete(cc, public)
recipients = List.delete(recipients, public)
[to, cc, recipients]
"unlisted" ->
to = [follower_address | List.delete(to, public)]
cc = [public | List.delete(cc, follower_address)]
recipients = recipients ++ [follower_address, public]
[to, cc, recipients]
_ ->
[to, cc, recipients]
end
end
def get_existing_votes(actor, %{data: %{"id" => id}}) do
actor
|> Activity.Queries.by_actor()
|> Activity.Queries.by_type("Create")
|> Activity.with_preloaded_object()
|> where([a, object: o], fragment("(?)->>'inReplyTo' = ?", o.data, ^to_string(id)))
|> where([a, object: o], fragment("(?)->>'type' = 'Answer'", o.data))
|> Repo.all()
end
end