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

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# Pleroma: A lightweight social networking server
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# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.Web.ActivityPub.Utils do
alias Ecto.Changeset
alias Ecto.UUID
alias Pleroma.Activity
alias Pleroma.Notification
alias Pleroma.Object
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alias Pleroma.Repo
alias Pleroma.User
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alias Pleroma.Web
alias Pleroma.Web.ActivityPub.Visibility
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alias Pleroma.Web.Endpoint
alias Pleroma.Web.Router.Helpers
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import Ecto.Query
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require Logger
require Pleroma.Constants
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@supported_object_types ["Article", "Note", "Video", "Page", "Question", "Answer", "Audio"]
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@supported_report_states ~w(open closed resolved)
@valid_visibilities ~w(public unlisted private direct)
# 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.
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def get_ap_id(%{"id" => id} = _), do: id
def get_ap_id(id), do: id
def normalize_params(params) do
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Map.put(params, "actor", get_ap_id(params["actor"]))
end
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@spec determine_explicit_mentions(map()) :: map()
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
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object
|> Map.put("tag", [tag])
|> determine_explicit_mentions()
end
def determine_explicit_mentions(_), do: []
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@spec recipient_in_collection(any(), any()) :: boolean()
defp recipient_in_collection(ap_id, coll) when is_binary(coll), do: ap_id == coll
defp recipient_in_collection(ap_id, coll) when is_list(coll), do: ap_id in coll
defp recipient_in_collection(_, _), do: false
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@spec recipient_in_message(User.t(), User.t(), map()) :: boolean()
def recipient_in_message(%User{ap_id: ap_id} = recipient, %User{} = actor, params) do
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addresses = [params["to"], params["cc"], params["bto"], params["bcc"]]
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cond do
Enum.any?(addresses, &recipient_in_collection(ap_id, &1)) -> true
# if the message is unaddressed at all, then assume it is directly addressed
# to the recipient
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Enum.all?(addresses, &is_nil(&1)) -> true
# if the message is sent from somebody the user is following, then assume it
# is addressed to the recipient
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User.following?(recipient, actor) -> true
true -> false
end
end
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? =
!recipient_in_collection(ap_id, params["to"]) &&
!recipient_in_collection(ap_id, params["cc"])
if need_splice? do
cc_list = extract_list(params["cc"])
Map.put(params, "cc", [ap_id | cc_list])
else
params
end
end
def make_json_ld_header do
%{
"@context" => [
"https://www.w3.org/ns/activitystreams",
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"#{Web.base_url()}/schemas/litepub-0.1.jsonld",
%{
"@language" => "und"
}
]
}
end
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def make_date do
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DateTime.utc_now() |> DateTime.to_iso8601()
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end
def generate_activity_id do
generate_id("activities")
end
def generate_context_id do
generate_id("contexts")
end
def generate_object_id do
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Helpers.o_status_url(Endpoint, :object, UUID.generate())
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end
def generate_id(type) do
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"#{Web.base_url()}/#{type}/#{UUID.generate()}"
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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")
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# 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)
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with true <- is_nil(object),
changeset <- Object.context_mapping(context),
{:ok, inserted_object} <- Repo.insert(changeset) do
inserted_object
else
_ ->
object
end
end
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@doc """
Enqueues an activity for federation if it's local
"""
@spec maybe_federate(any()) :: :ok
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def maybe_federate(%Activity{local: true} = activity) do
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if Pleroma.Config.get!([:instance, :federating]) do
Pleroma.Web.Federator.publish(activity)
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end
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:ok
end
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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
"""
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@spec lazy_put_activity_defaults(map(), boolean) :: map()
def lazy_put_activity_defaults(map, fake? \\ false)
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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)
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end
def lazy_put_activity_defaults(map, _fake?) do
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%{data: %{"id" => context}, id: context_id} = create_context(map["context"])
map
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|> Map.put_new_lazy("id", &generate_activity_id/0)
|> Map.put_new_lazy("published", &make_date/0)
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|> Map.put_new("context", context)
|> Map.put_new("context_id", context_id)
|> lazy_put_object_defaults(false)
end
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# 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}
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end
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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}
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end
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defp lazy_put_object_defaults(activity, _), do: activity
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@doc """
Inserts a full object if it is contained in an activity.
"""
def insert_full_object(%{"object" => %{"type" => type} = object_data} = map)
when is_map(object_data) and 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}
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end
end
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def insert_full_object(map), do: {:ok, map, nil}
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#### 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
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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()
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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)
%{
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"type" => "Like",
"actor" => ap_id,
"object" => id,
"to" => to,
"cc" => cc,
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"context" => object.data["context"]
}
|> maybe_put("id", activity_id)
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end
@spec update_element_in_object(String.t(), list(any), Object.t()) ::
{:ok, Object.t()} | {:error, Ecto.Changeset.t()}
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def update_element_in_object(property, element, object) do
data =
Map.merge(
object.data,
%{"#{property}_count" => length(element), "#{property}s" => element}
)
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object
|> Changeset.change(data: data)
|> Object.update_and_set_cache()
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end
@spec add_like_to_object(Activity.t(), Object.t()) ::
{:ok, Object.t()} | {:error, Ecto.Changeset.t()}
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def add_like_to_object(%Activity{data: %{"actor" => actor}}, object) do
[actor | fetch_likes(object)]
|> Enum.uniq()
|> update_likes_in_object(object)
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end
@spec remove_like_from_object(Activity.t(), Object.t()) ::
{:ok, Object.t()} | {:error, Ecto.Changeset.t()}
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def remove_like_from_object(%Activity{data: %{"actor" => actor}}, object) do
object
|> fetch_likes()
|> List.delete(actor)
|> update_likes_in_object(object)
end
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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
[]
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end
end
#### Follow-related helpers
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@doc """
Updates a follow activity's state (for locked accounts).
"""
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@spec update_follow_state_for_all(Activity.t(), String.t()) :: {:ok, Activity} | {:error, any()}
def update_follow_state_for_all(
%Activity{data: %{"actor" => actor, "object" => object}} = activity,
state
) do
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"Follow"
|> Activity.Queries.by_type()
|> Activity.Queries.by_actor(actor)
|> Activity.Queries.by_object_id(object)
|> where(fragment("data->>'state' = 'pending'"))
|> update(set: [data: fragment("jsonb_set(data, '{state}', ?)", ^state)])
|> Repo.update_all([])
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User.set_follow_state_cache(actor, object, state)
activity = Activity.get_by_id(activity.id)
{:ok, activity}
end
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def update_follow_state(
%Activity{data: %{"actor" => actor, "object" => object}} = 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
User.set_follow_state_cache(actor, object, state)
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{:ok, activity}
end
end
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@doc """
Makes a follow activity data for the given follower and followed
"""
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def make_follow_data(
%User{ap_id: follower_id},
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%User{ap_id: followed_id} = _followed,
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activity_id
) do
%{
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"type" => "Follow",
"actor" => follower_id,
"to" => [followed_id],
"cc" => [Pleroma.Constants.as_public()],
"object" => followed_id,
"state" => "pending"
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}
|> maybe_put("id", activity_id)
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end
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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()
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end
#### Announce-related helpers
@doc """
Retruns an existing announce activity if the notice has already been announced
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"""
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@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()
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end
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@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"]
}
|> maybe_put("id", activity_id)
end
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def make_announce_data(
%User{ap_id: ap_id} = user,
%Object{data: %{"id" => id}} = object,
activity_id,
true
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) do
%{
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"type" => "Announce",
"actor" => ap_id,
"object" => id,
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"to" => [user.follower_address, object.data["actor"]],
"cc" => [Pleroma.Constants.as_public()],
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"context" => object.data["context"]
}
|> maybe_put("id", activity_id)
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end
@doc """
Make unannounce activity data for the given actor and object
"""
def make_unannounce_data(
%User{ap_id: ap_id} = user,
%Activity{data: %{"context" => context, "object" => object}} = activity,
activity_id
) do
object = Object.normalize(object)
%{
"type" => "Undo",
"actor" => ap_id,
"object" => activity.data,
"to" => [user.follower_address, object.data["actor"]],
"cc" => [Pleroma.Constants.as_public()],
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"context" => context
}
|> maybe_put("id", activity_id)
end
def make_unlike_data(
%User{ap_id: ap_id} = user,
%Activity{data: %{"context" => context, "object" => object}} = activity,
activity_id
) do
object = Object.normalize(object)
%{
"type" => "Undo",
"actor" => ap_id,
"object" => activity.data,
"to" => [user.follower_address, object.data["actor"]],
"cc" => [Pleroma.Constants.as_public()],
"context" => context
}
|> maybe_put("id", activity_id)
end
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@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
announcements = take_announcements(object)
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with announcements <- Enum.uniq([actor | announcements]) do
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update_element_in_object("announcement", announcements, object)
end
end
def add_announce_to_object(_, object), do: {:ok, object}
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@spec remove_announce_from_object(Activity.t(), Object.t()) ::
{:ok, Object.t()} | {:error, Ecto.Changeset.t()}
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def remove_announce_from_object(%Activity{data: %{"actor" => actor}}, object) do
with announcements <- List.delete(take_announcements(object), actor) do
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update_element_in_object("announcement", announcements, object)
end
end
defp take_announcements(%{data: %{"announcements" => announcements}} = _)
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when is_list(announcements),
do: announcements
defp take_announcements(_), do: []
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#### Unfollow-related helpers
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def make_unfollow_data(follower, followed, follow_activity, activity_id) do
%{
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"type" => "Undo",
"actor" => follower.ap_id,
"to" => [followed.ap_id],
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"object" => follow_activity.data
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}
|> maybe_put("id", activity_id)
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end
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#### Block-related helpers
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@spec fetch_latest_block(User.t(), User.t()) :: Activity.t() | nil
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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()
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end
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def make_block_data(blocker, blocked, activity_id) do
%{
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"type" => "Block",
"actor" => blocker.ap_id,
"to" => [blocked.ap_id],
"object" => blocked.ap_id
}
|> maybe_put("id", activity_id)
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end
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def make_unblock_data(blocker, blocked, block_activity, activity_id) do
%{
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"type" => "Undo",
"actor" => blocker.ap_id,
"to" => [blocked.ap_id],
"object" => block_activity.data
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}
|> maybe_put("id", activity_id)
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end
#### Create-related helpers
def make_create_data(params, additional) do
published = params.published || make_date()
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%{
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"type" => "Create",
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"to" => params.to |> Enum.uniq(),
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"actor" => params.actor.ap_id,
"object" => params.object,
"published" => published,
"context" => params.context
}
|> Map.merge(additional)
end
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#### 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
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#### Flag-related helpers
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@spec make_flag_data(map(), map()) :: map()
def make_flag_data(%{actor: actor, context: context, content: content} = params, additional) do
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%{
"type" => "Flag",
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"actor" => actor.ap_id,
"content" => content,
"object" => build_flag_object(params),
"context" => context,
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"state" => "open"
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}
|> Map.merge(additional)
end
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def make_flag_data(_, _), do: %{}
defp build_flag_object(%{account: account, statuses: statuses} = _) do
[account.ap_id] ++
Enum.map(statuses || [], fn
%Activity{} = act -> act.data["id"]
act when is_map(act) -> act["id"]
act when is_binary(act) -> act
end)
end
defp build_flag_object(_), do: []
@doc """
Fetches the OrderedCollection/OrderedCollectionPage from `from`, limiting the amount of pages fetched after
the first one to `pages_left` pages.
If the amount of pages is higher than the collection has, it returns whatever was there.
"""
def fetch_ordered_collection(from, pages_left, acc \\ []) do
with {:ok, response} <- Tesla.get(from),
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{:ok, collection} <- Jason.decode(response.body) do
case collection["type"] do
"OrderedCollection" ->
# If we've encountered the OrderedCollection and not the page,
# just call the same function on the page address
fetch_ordered_collection(collection["first"], pages_left)
"OrderedCollectionPage" ->
if pages_left > 0 do
# There are still more pages
if Map.has_key?(collection, "next") do
# There are still more pages, go deeper saving what we have into the accumulator
fetch_ordered_collection(
collection["next"],
pages_left - 1,
acc ++ collection["orderedItems"]
)
else
# No more pages left, just return whatever we already have
acc ++ collection["orderedItems"]
end
else
# Got the amount of pages needed, add them all to the accumulator
acc ++ collection["orderedItems"]
end
_ ->
{:error, "Not an OrderedCollection or OrderedCollectionPage"}
end
end
end
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#### Report-related helpers
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()
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end
def update_report_state(_, _), do: {:error, "Unsupported state"}
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()
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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
def maybe_put(map, _key, nil), do: map
def maybe_put(map, key, value), do: Map.put(map, key, value)
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end