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("(?)->>'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"]], "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: :id], 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.follower_address, 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