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# Pleroma: A lightweight social networking server
# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.ActivityPub.Publisher do
alias Pleroma.Activity
alias Pleroma.Config
alias Pleroma.Delivery
alias Pleroma.HTTP
alias Pleroma.Instances
alias Pleroma.Object
alias Pleroma.Repo
alias Pleroma.User
alias Pleroma.Web.ActivityPub.Relay
alias Pleroma.Web.ActivityPub.Transmogrifier
alias Pleroma.Workers.PublisherWorker
require Pleroma.Constants
import Pleroma.Web.ActivityPub.Visibility
require Logger
@moduledoc """
ActivityPub outgoing federation module.
"""
@doc """
Enqueue publishing a single activity.
"""
@spec enqueue_one(map(), Keyword.t()) :: {:ok, %Oban.Job{}}
def enqueue_one(%{} = params, worker_args \\ []) do
PublisherWorker.enqueue(
"publish_one",
%{"params" => params},
worker_args
)
end
@doc """
Gathers a set of remote users given an IR envelope.
"""
def remote_users(%User{id: user_id}, %{data: %{"to" => to} = data}) do
cc = Map.get(data, "cc", [])
bcc =
data
|> Map.get("bcc", [])
|> Enum.reduce([], fn ap_id, bcc ->
case Pleroma.List.get_by_ap_id(ap_id) do
%Pleroma.List{user_id: ^user_id} = list ->
{:ok, following} = Pleroma.List.get_following(list)
bcc ++ Enum.map(following, & &1.ap_id)
_ ->
bcc
end
end)
[to, cc, bcc]
|> Enum.concat()
|> Enum.map(&User.get_cached_by_ap_id/1)
|> Enum.filter(fn user -> user && !user.local end)
end
@doc """
Determine if an activity can be represented by running it through Transmogrifier.
"""
def representable?(%Activity{} = activity) do
with {:ok, _data} <- Transmogrifier.prepare_outgoing(activity.data) do
true
else
_e ->
false
end
end
@doc """
Publish a single message to a peer. Takes a struct with the following
parameters set:
* `inbox`: the inbox to publish to
* `json`: the JSON message body representing the ActivityPub message
* `actor`: the actor which is signing the message
* `id`: the ActivityStreams URI of the message
"""
def publish_one(%{inbox: inbox, json: json, actor: %User{} = actor, id: id} = params) do
Logger.debug("Federating #{id} to #{inbox}")
uri = %{path: path} = URI.parse(inbox)
digest = "SHA-256=" <> (:crypto.hash(:sha256, json) |> Base.encode64())
date = Pleroma.Signature.signed_date()
signature =
Pleroma.Signature.sign(actor, %{
"(request-target)": "post #{path}",
host: signature_host(uri),
"content-length": byte_size(json),
digest: digest,
date: date
})
with {:ok, %{status: code}} = result when code in 200..299 <-
HTTP.post(
inbox,
json,
[
{"Content-Type", "application/activity+json"},
{"Date", date},
{"signature", signature},
{"digest", digest}
]
) do
if not Map.has_key?(params, :unreachable_since) || params[:unreachable_since] do
Instances.set_reachable(inbox)
end
result
else
{_post_result, %{status: code} = response} = e ->
unless params[:unreachable_since], do: Instances.set_unreachable(inbox)
Logger.metadata(activity: id, inbox: inbox, status: code)
Logger.error("Publisher failed to inbox #{inbox} with status #{code}")
case response do
%{status: 403} -> {:discard, :forbidden}
%{status: 404} -> {:discard, :not_found}
%{status: 410} -> {:discard, :not_found}
_ -> {:error, e}
end
{:error, :pool_full} ->
Logger.debug("Publisher snoozing worker job due to full connection pool")
{:snooze, 30}
e ->
unless params[:unreachable_since], do: Instances.set_unreachable(inbox)
Logger.metadata(activity: id, inbox: inbox)
Logger.error("Publisher failed to inbox #{inbox} #{inspect(e)}")
{:error, e}
end
end
def publish_one(%{actor_id: actor_id} = params) do
actor = User.get_cached_by_id(actor_id)
params
|> Map.delete(:actor_id)
|> Map.put(:actor, actor)
|> publish_one()
end
defp signature_host(%URI{port: port, scheme: scheme, host: host}) do
if port == URI.default_port(scheme) do
host
else
"#{host}:#{port}"
end
end
defp should_federate?(inbox, public) do
if public do
true
else
%{host: host} = URI.parse(inbox)
quarantined_instances =
Config.get([:instance, :quarantined_instances], [])
|> Pleroma.Web.ActivityPub.MRF.instance_list_from_tuples()
|> Pleroma.Web.ActivityPub.MRF.subdomains_regex()
!Pleroma.Web.ActivityPub.MRF.subdomain_match?(quarantined_instances, host)
end
end
@spec recipients(User.t(), Activity.t()) :: [[User.t()]]
defp recipients(actor, activity) do
followers =
if actor.follower_address in activity.recipients do
User.get_external_followers(actor)
else
[]
end
fetchers =
with %Activity{data: %{"type" => "Delete"}} <- activity,
%Object{id: object_id} <- Object.normalize(activity, fetch: false),
fetchers <- User.get_delivered_users_by_object_id(object_id),
_ <- Delivery.delete_all_by_object_id(object_id) do
fetchers
else
_ ->
[]
end
mentioned = remote_users(actor, activity)
non_mentioned = (followers ++ fetchers) -- mentioned
[mentioned, non_mentioned]
end
defp get_cc_ap_ids(ap_id, recipients) do
host = Map.get(URI.parse(ap_id), :host)
recipients
|> Enum.filter(fn %User{ap_id: ap_id} -> Map.get(URI.parse(ap_id), :host) == host end)
|> Enum.map(& &1.ap_id)
end
defp maybe_use_sharedinbox(%User{shared_inbox: nil, inbox: inbox}), do: inbox
defp maybe_use_sharedinbox(%User{shared_inbox: shared_inbox}), do: shared_inbox
@doc """
Determine a user inbox to use based on heuristics. These heuristics
are based on an approximation of the ``sharedInbox`` rules in the
[ActivityPub specification][ap-sharedinbox].
Please do not edit this function (or its children) without reading
the spec, as editing the code is likely to introduce some breakage
without some familiarity.
[ap-sharedinbox]: https://www.w3.org/TR/activitypub/#shared-inbox-delivery
"""
def determine_inbox(
%Activity{data: activity_data},
%User{inbox: inbox} = user
) do
to = activity_data["to"] || []
cc = activity_data["cc"] || []
type = activity_data["type"]
cond do
type == "Delete" ->
maybe_use_sharedinbox(user)
Pleroma.Constants.as_public() in to || Pleroma.Constants.as_public() in cc ->
maybe_use_sharedinbox(user)
length(to) + length(cc) > 1 ->
maybe_use_sharedinbox(user)
true ->
inbox
end
end
@doc """
Publishes an activity with BCC to all relevant peers.
"""
def publish(%User{} = actor, %{data: %{"bcc" => bcc}} = activity)
when is_list(bcc) and bcc != [] do
public = public?(activity)
{:ok, data} = Transmogrifier.prepare_outgoing(activity.data)
[priority_recipients, recipients] = recipients(actor, activity)
inboxes =
[priority_recipients, recipients]
|> Enum.map(fn recipients ->
recipients
|> Enum.map(fn %User{} = user ->
determine_inbox(activity, user)
end)
|> Enum.uniq()
|> Enum.filter(fn inbox -> should_federate?(inbox, public) end)
|> Instances.filter_reachable()
end)
Repo.checkout(fn ->
Enum.each(inboxes, fn inboxes ->
Enum.each(inboxes, fn {inbox, unreachable_since} ->
%User{ap_id: ap_id} = Enum.find(recipients, fn actor -> actor.inbox == inbox end)
# Get all the recipients on the same host and add them to cc. Otherwise, a remote
# instance would only accept a first message for the first recipient and ignore the rest.
cc = get_cc_ap_ids(ap_id, recipients)
json =
data
|> Map.put("cc", cc)
|> Jason.encode!()
__MODULE__.enqueue_one(%{
inbox: inbox,
json: json,
actor_id: actor.id,
id: activity.data["id"],
unreachable_since: unreachable_since
})
end)
end)
end)
end
# Publishes an activity to all relevant peers.
def publish(%User{} = actor, %Activity{} = activity) do
public = public?(activity)
if public && Config.get([:instance, :allow_relay]) do
Logger.debug(fn -> "Relaying #{activity.data["id"]} out" end)
Relay.publish(activity)
end
{:ok, data} = Transmogrifier.prepare_outgoing(activity.data)
json = Jason.encode!(data)
[priority_inboxes, inboxes] =
recipients(actor, activity)
|> Enum.map(fn recipients ->
recipients
|> Enum.map(fn %User{} = user ->
determine_inbox(activity, user)
end)
|> Enum.uniq()
|> Enum.filter(fn inbox -> should_federate?(inbox, public) end)
end)
inboxes = inboxes -- priority_inboxes
[{priority_inboxes, 0}, {inboxes, 1}]
|> Enum.each(fn {inboxes, priority} ->
inboxes
|> Instances.filter_reachable()
|> Enum.each(fn {inbox, unreachable_since} ->
__MODULE__.enqueue_one(
%{
inbox: inbox,
json: json,
actor_id: actor.id,
id: activity.data["id"],
unreachable_since: unreachable_since
},
priority: priority
)
end)
end)
:ok
end
def gather_webfinger_links(%User{} = user) do
[
%{"rel" => "self", "type" => "application/activity+json", "href" => user.ap_id},
%{
"rel" => "self",
"type" => "application/ld+json; profile=\"https://www.w3.org/ns/activitystreams\"",
"href" => user.ap_id
},
%{
"rel" => "http://ostatus.org/schema/1.0/subscribe",
"template" => "#{Pleroma.Web.Endpoint.url()}/ostatus_subscribe?acct={uri}"
}
]
end
def gather_nodeinfo_protocol_names, do: ["activitypub"]
end

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