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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_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
@doc """
Enqueues an activity for federation if it's local
"""
def maybe_federate(%Activity{local: true} = activity) do
Pleroma.Web.Federator.enqueue(:publish, activity)
: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
map = map
|> Map.put_new_lazy("id", &generate_activity_id/0)
|> Map.put_new_lazy("published", &make_date/0)
if is_map(map["object"]) do
object = lazy_put_object_defaults(map["object"])
%{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) do
map
|> Map.put_new_lazy("id", &generate_object_id/0)
|> Map.put_new_lazy("published", &make_date/0)
end
@doc """
Inserts a full object if it is contained in an activity.
"""
def insert_full_object(%{"object" => object_data}) when is_map(object_data) do
with {:ok, object} <- 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}} = object) do
query = from activity in Activity,
where: fragment("? @> ?", activity.data, ^%{actor: actor, object: id, type: "Like"})
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" => [User.ap_followers(actor), object.data["actor"]],
"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],
"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: :inserted_at],
limit: 1
Repo.one(query)
end
#### Announce-related helpers
@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.ap_followers(user), object.data["actor"]],
"context" => object.data["context"]
}
if activity_id, do: Map.put(data, "id", activity_id), else: data
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
#### 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()
activity = %{
"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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