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# Pleroma: A lightweight social networking server
# Copyright © 2017-2019 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.HTTP
alias Pleroma.Instances
alias Pleroma.User
alias Pleroma.Web.ActivityPub.Relay
alias Pleroma.Web.ActivityPub.Transmogrifier
import Pleroma.Web.ActivityPub.Visibility
@behaviour Pleroma.Web.Federator.Publisher
require Logger
@moduledoc """
ActivityPub outgoing federation module.
"""
@doc """
Determine if an activity can be represented by running it through Transmogrifier.
"""
def is_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.info("Federating #{id} to #{inbox}")
host = URI.parse(inbox).host
digest = "SHA-256=" <> (:crypto.hash(:sha256, json) |> Base.encode64())
date =
NaiveDateTime.utc_now()
|> Timex.format!("{WDshort}, {0D} {Mshort} {YYYY} {h24}:{m}:{s} GMT")
signature =
Pleroma.Signature.sign(actor, %{
host: host,
"content-length": byte_size(json),
digest: digest,
date: date
})
with {:ok, %{status: code}} when code in 200..299 <-
result =
HTTP.post(
inbox,
json,
[
{"Content-Type", "application/activity+json"},
{"Date", date},
{"signature", signature},
{"digest", digest}
]
) do
if !Map.has_key?(params, :unreachable_since) || params[:unreachable_since],
do: Instances.set_reachable(inbox)
result
else
{_post_result, response} ->
unless params[:unreachable_since], do: Instances.set_unreachable(inbox)
{:error, response}
end
end
defp should_federate?(inbox, public) do
if public do
true
else
inbox_info = URI.parse(inbox)
!Enum.member?(Config.get([:instance, :quarantined_instances], []), inbox_info.host)
end
end
@doc """
Publishes an activity to all relevant peers.
"""
def publish(%User{} = actor, %Activity{} = activity) do
remote_followers =
if actor.follower_address in activity.recipients do
{:ok, followers} = User.get_followers(actor)
followers |> Enum.filter(&(!&1.local))
else
[]
end
public = is_public?(activity)
if public && Config.get([:instance, :allow_relay]) do
Logger.info(fn -> "Relaying #{activity.data["id"]} out" end)
Relay.publish(activity)
end
{:ok, data} = Transmogrifier.prepare_outgoing(activity.data)
json = Jason.encode!(data)
(Pleroma.Web.Salmon.remote_users(activity) ++ remote_followers)
|> Enum.filter(fn user -> User.ap_enabled?(user) end)
|> Enum.map(fn %{info: %{source_data: data}} ->
(is_map(data["endpoints"]) && Map.get(data["endpoints"], "sharedInbox")) || data["inbox"]
end)
|> Enum.uniq()
|> Enum.filter(fn inbox -> should_federate?(inbox, public) end)
|> Instances.filter_reachable()
|> Enum.each(fn {inbox, unreachable_since} ->
Pleroma.Web.Federator.Publisher.enqueue_one(
__MODULE__,
%{
inbox: inbox,
json: json,
actor: actor,
id: activity.data["id"],
unreachable_since: unreachable_since
}
)
end)
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
}
]
end
def gather_nodeinfo_protocol_names, do: ["activitypub"]
end
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