mobilizon/lib/federation/activity_pub/publisher.ex

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defmodule Mobilizon.Federation.ActivityPub.Publisher do
@moduledoc """
Handle publishing activities
"""
alias Mobilizon.Actors
alias Mobilizon.Actors.Actor
alias Mobilizon.Config
alias Mobilizon.Federation.ActivityPub.{Activity, Federator, Relay, Transmogrifier, Visibility}
alias Mobilizon.Federation.HTTPSignatures.Signature
alias Mobilizon.Service.HTTP.ActivityPub, as: ActivityPubClient
require Logger
import Mobilizon.Federation.ActivityPub.Utils,
only: [remote_actors: 1, create_full_domain_string: 1]
@doc """
Publish an activity to all appropriated audiences inboxes
"""
# credo:disable-for-lines:47
@spec publish(Actor.t(), Activity.t()) :: :ok
def publish(actor, %Activity{recipients: recipients} = activity) do
Logger.debug("Publishing an activity")
Logger.debug(inspect(activity, pretty: true))
public = Visibility.public?(activity)
Logger.debug("is public ? #{public}")
if public && create_activity?(activity) && Config.get([:instance, :allow_relay]) do
Logger.info(fn -> "Relaying #{activity.data["id"]} out" end)
Relay.publish(activity)
end
recipients =
if public && Config.get([:instance, :allow_relay]) do
followers_url = Relay.get_actor().followers_url
Logger.debug(
"Public activity, so adding relay followers URL to recipients: #{inspect(followers_url)}"
)
recipients ++ [followers_url]
else
recipients
end
recipients = Enum.uniq(recipients)
{recipients, followers} = convert_followers_in_recipients(recipients)
Logger.debug("Found the following followers: #{inspect(Enum.map(followers, & &1.url))}")
{recipients, members} = convert_members_in_recipients(recipients)
Logger.debug("Found the following followers: #{inspect(Enum.map(members, & &1.url))}")
remote_inboxes =
(remote_actors(recipients) ++ followers ++ members)
|> Enum.map(fn actor -> actor.shared_inbox_url || actor.inbox_url end)
|> Enum.uniq()
{:ok, data} = Transmogrifier.prepare_outgoing(activity.data)
json = Jason.encode!(data)
Logger.debug(fn -> "Remote inboxes are : #{inspect(remote_inboxes)}" end)
Enum.each(remote_inboxes, fn inbox ->
Federator.enqueue(:publish_single_ap, %{
inbox: inbox,
json: json,
actor: actor,
id: activity.data["id"]
})
end)
end
@doc """
Publish an activity to a specific inbox
"""
@spec publish_one(%{inbox: String.t(), json: String.t(), actor: Actor.t(), id: String.t()}) ::
Tesla.Env.result()
def publish_one(%{inbox: inbox, json: json, actor: actor, id: id}) do
Logger.info("Federating #{id} to #{inbox}")
%URI{path: path} = uri = URI.new!(inbox)
digest = Signature.build_digest(json)
date = Signature.generate_date_header()
# request_target = Signature.generate_request_target("POST", path)
signature =
Signature.sign(actor, %{
"(request-target)": "post #{path}",
host: create_full_domain_string(uri),
"content-length": byte_size(json),
digest: digest,
date: date
})
headers = [
{"Content-Type", "application/activity+json"},
{"signature", signature},
{"digest", digest},
{"date", date}
]
client = ActivityPubClient.client(headers: headers)
ActivityPubClient.post(client, inbox, json)
end
@spec convert_followers_in_recipients(list(String.t())) :: {list(String.t()), list(String.t())}
defp convert_followers_in_recipients(recipients) do
Enum.reduce(recipients, {recipients, []}, fn recipient, {recipients, follower_actors} = acc ->
if is_nil(recipient) do
acc
else
case Actors.get_actor_by_followers_url(recipient) do
%Actor{} = group ->
{Enum.filter(recipients, fn recipient -> recipient != group.followers_url end),
follower_actors ++ Actors.list_external_followers_for_actor(group)}
nil ->
acc
end
end
end)
end
@spec create_activity?(Activity.t()) :: boolean
defp create_activity?(%Activity{data: %{"type" => "Create"}}), do: true
defp create_activity?(_), do: false
@spec convert_members_in_recipients(list(String.t())) :: {list(String.t()), list(Actor.t())}
defp convert_members_in_recipients(recipients) do
Enum.reduce(recipients, {recipients, []}, fn recipient, {recipients, member_actors} = acc ->
if is_nil(recipient) do
acc
else
case Actors.get_group_by_members_url(recipient) do
# If the group is local just add external members
%Actor{domain: domain} = group when is_nil(domain) ->
{Enum.filter(recipients, fn recipient -> recipient != group.members_url end),
member_actors ++ Actors.list_external_actors_members_for_group(group)}
# If it's remote add the remote group actor as well
%Actor{} = group ->
{Enum.filter(recipients, fn recipient -> recipient != group.members_url end),
member_actors ++ Actors.list_external_actors_members_for_group(group) ++ [group]}
_ ->
acc
end
end
end)
end
end