debianize-mobilizon/lib/web/controllers/activity_pub_controller.ex

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# Portions of this file are derived from Pleroma:
# Copyright © 2017-2018 Pleroma Authors <https://pleroma.social>
# SPDX-License-Identifier: AGPL-3.0-only
# Upstream: https://git.pleroma.social/pleroma/pleroma/blob/develop/lib/pleroma/web/activity_pub/activity_pub_controller.ex
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defmodule Mobilizon.Web.ActivityPubController do
use Mobilizon.Web, :controller
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alias Mobilizon.{Actors, Config}
alias Mobilizon.Actors.{Actor, Member}
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alias Mobilizon.Federation.ActivityPub
alias Mobilizon.Federation.ActivityPub.Federator
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alias Mobilizon.Web.ActivityPub.ActorView
alias Mobilizon.Web.Cache
alias Plug.Conn
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require Logger
action_fallback(:errors)
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plug(Mobilizon.Web.Plugs.Federating when action in [:inbox, :relay])
plug(:relay_active? when action in [:relay])
def relay_active?(conn, _) do
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if Config.get([:instance, :allow_relay]) do
conn
else
conn
|> put_status(404)
|> json("Not found")
|> halt()
end
end
def following(conn, args) do
actor_collection(conn, "following", args)
end
def followers(conn, args) do
actor_collection(conn, "followers", args)
end
def members(conn, args) do
actor_collection(conn, "members", args)
end
def resources(conn, args) do
actor_collection(conn, "resources", args)
end
def posts(conn, args) do
actor_collection(conn, "posts", args)
end
def todos(conn, args) do
actor_collection(conn, "todos", args)
end
def events(conn, args) do
actor_collection(conn, "events", args)
end
def discussions(conn, args) do
actor_collection(conn, "discussions", args)
end
@ok_statuses [:ok, :commit]
@spec member(Plug.Conn.t(), map) :: {:error, :not_found} | Plug.Conn.t()
def member(conn, %{"uuid" => uuid}) do
with {status, %Member{parent: %Actor{} = group, actor: %Actor{domain: nil} = _actor} = member}
when status in @ok_statuses <-
Cache.get_member_by_uuid_with_preload(uuid),
actor <- Map.get(conn.assigns, :actor),
true <- actor_applicant_group_member?(group, actor) do
json(
conn,
ActorView.render("member.json", %{
member: member,
actor_applicant: actor
})
)
else
{status, %Member{actor: %Actor{url: domain}, parent: %Actor{} = group, url: url}}
when status in @ok_statuses and not is_nil(domain) ->
with actor <- Map.get(conn.assigns, :actor),
true <- actor_applicant_group_member?(group, actor) do
redirect(conn, external: url)
else
_ ->
conn
|> put_status(404)
|> json("Not found")
end
_ ->
conn
|> put_status(404)
|> json("Not found")
end
end
def outbox(conn, args) do
actor_collection(conn, "outbox", args)
end
# TODO: Ensure that this inbox is a recipient of the message
def inbox(%{assigns: %{valid_signature: true}} = conn, params) do
Logger.debug("Got something with valid signature inside inbox")
Federator.enqueue(:incoming_ap_doc, params)
json(conn, "ok")
end
# only accept relayed Creates
def inbox(conn, %{"type" => "Create"} = params) do
Logger.info(
"Signature missing or not from author, relayed Create message, fetching object from source"
)
ActivityPub.fetch_object_from_url(params["object"]["id"])
json(conn, "ok")
end
def inbox(conn, params) do
headers = Enum.into(conn.req_headers, %{})
if String.contains?(headers["signature"], params["actor"]) do
Logger.error(
"Signature validation error for: #{params["actor"]}, make sure you are forwarding the HTTP Host header!"
)
Logger.debug(inspect(conn.req_headers))
end
json(conn, "error")
end
def relay(conn, _params) do
with {status, %Actor{} = actor} when status in [:commit, :ok] <- Cache.get_relay() do
conn
|> put_resp_header("content-type", "application/activity+json")
|> json(ActorView.render("actor.json", %{actor: actor}))
end
end
def errors(conn, {:error, :not_found}) do
conn
|> put_status(404)
|> json("Not found")
end
def errors(conn, e) do
Logger.debug(inspect(e))
conn
|> put_status(500)
|> json("Unknown Error")
end
@spec actor_collection(Conn.t(), String.t(), map()) :: Conn.t()
defp actor_collection(conn, collection, %{"name" => name, "page" => page}) do
with {page, ""} <- Integer.parse(page),
%Actor{} = actor <- Actors.get_local_actor_by_name_with_preload(name) do
conn
|> put_resp_header("content-type", "application/activity+json")
|> json(
ActorView.render("#{collection}.json", %{
actor: actor,
page: page,
actor_applicant: Map.get(conn.assigns, :actor)
})
)
end
end
defp actor_collection(conn, collection, %{"name" => name}) do
with %Actor{} = actor <- Actors.get_local_actor_by_name_with_preload(name) do
conn
|> put_resp_header("content-type", "application/activity+json")
|> json(
ActorView.render("#{collection}.json", %{
actor: actor,
actor_applicant: Map.get(conn.assigns, :actor)
})
)
end
end
defp actor_applicant_group_member?(%Actor{}, nil), do: false
defp actor_applicant_group_member?(%Actor{id: group_id}, %Actor{id: actor_applicant_id}),
do:
Actors.get_member(actor_applicant_id, group_id, [
:member,
:moderator,
:administrator,
:creator
]) != {:error, :member_not_found}
end