mobilizon/lib/federation/activity_pub/actions/follow.ex

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defmodule Mobilizon.Federation.ActivityPub.Actions.Follow do
@moduledoc """
Follow people
"""
alias Mobilizon.Actors
alias Mobilizon.Actors.{Actor, Follower}
alias Mobilizon.Federation.ActivityPub.Types
alias Mobilizon.Federation.ActivityStream.Convertible
alias Mobilizon.Web.Endpoint
require Logger
import Mobilizon.Federation.ActivityPub.Utils,
only: [
create_activity: 2,
maybe_federate: 1,
make_unfollow_data: 4
]
@doc """
Make an actor follow another, using an activity of type `Follow`
"""
@spec follow(Actor.t(), Actor.t(), String.t() | nil, boolean, map) ::
{:ok, Activity.t(), Follower.t()} | {:error, atom | Ecto.Changeset.t() | String.t()}
def follow(
%Actor{} = follower,
%Actor{} = followed,
activity_id \\ nil,
local \\ true,
additional \\ %{}
) do
if followed.id != follower.id do
case Types.Actors.follow(
follower,
followed,
local,
Map.merge(additional, %{"activity_id" => activity_id})
) do
{:ok, activity_data, %Follower{} = follower} ->
{:ok, activity} = create_activity(activity_data, local)
maybe_federate(activity)
{:ok, activity, follower}
{:error, err} ->
{:error, err}
end
else
{:error, "Can't follow yourself"}
end
end
@doc """
Make an actor unfollow another, using an activity of type `Undo` a `Follow`.
"""
@spec unfollow(Actor.t(), Actor.t(), String.t() | nil, boolean()) ::
{:ok, Activity.t(), Follower.t()} | {:error, String.t()}
def unfollow(%Actor{} = follower, %Actor{} = followed, activity_id \\ nil, local \\ true) do
with {:ok, %Follower{id: follow_id} = follow} <- Actors.unfollow(followed, follower) do
# We recreate the follow activity
follow_as_data =
Convertible.model_to_as(%{follow | actor: follower, target_actor: followed})
{:ok, follow_activity} = create_activity(follow_as_data, local)
activity_unfollow_id = activity_id || "#{Endpoint.url()}/unfollow/#{follow_id}/activity"
unfollow_data =
make_unfollow_data(follower, followed, follow_activity, activity_unfollow_id)
{:ok, activity} = create_activity(unfollow_data, local)
maybe_federate(activity)
{:ok, activity, follow}
end
end
end