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Diffstat (limited to 'lib/pleroma/web/activity_pub/utils.ex')
| -rw-r--r-- | lib/pleroma/web/activity_pub/utils.ex | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/lib/pleroma/web/activity_pub/utils.ex b/lib/pleroma/web/activity_pub/utils.ex new file mode 100644 index 000000000..ed5ae021e --- /dev/null +++ b/lib/pleroma/web/activity_pub/utils.ex @@ -0,0 +1,210 @@ +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 |