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activity_pub_controller.ex
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activity_pub_controller.ex
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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.ActivityPubController do
use Pleroma.Web, :controller
alias Pleroma.Activity
alias Pleroma.Delivery
alias Pleroma.Object
alias Pleroma.Object.Fetcher
alias Pleroma.User
alias Pleroma.Web.ActivityPub.ActivityPub
alias Pleroma.Web.ActivityPub.InternalFetchActor
alias Pleroma.Web.ActivityPub.ObjectView
alias Pleroma.Web.ActivityPub.Pipeline
alias Pleroma.Web.ActivityPub.Relay
alias Pleroma.Web.ActivityPub.Transmogrifier
alias Pleroma.Web.ActivityPub.UserView
alias Pleroma.Web.ActivityPub.Utils
alias Pleroma.Web.ActivityPub.Visibility
alias Pleroma.Web.ControllerHelper
alias Pleroma.Web.Endpoint
alias Pleroma.Web.Federator
alias Pleroma.Web.Plugs.EnsureAuthenticatedPlug
alias Pleroma.Web.Plugs.FederatingPlug
require Logger
action_fallback(:errors)
@federating_only_actions [:internal_fetch, :relay, :relay_following, :relay_followers]
plug(FederatingPlug when action in @federating_only_actions)
plug(
EnsureAuthenticatedPlug,
[unless_func: &FederatingPlug.federating?/1] when action not in @federating_only_actions
)
# Note: :following and :followers must be served even without authentication (as via :api)
plug(
EnsureAuthenticatedPlug
when action in [:read_inbox, :update_outbox, :whoami, :upload_media]
)
plug(Majic.Plug, [pool: Pleroma.MajicPool] when action in [:upload_media])
plug(
Pleroma.Web.Plugs.Cache,
[query_params: false, tracking_fun: &__MODULE__.track_object_fetch/2]
when action in [:activity, :object]
)
plug(:log_inbox_metadata when action in [:inbox])
plug(:relay_active? when action in [:relay])
defp relay_active?(conn, _) do
if Pleroma.Config.get([:instance, :allow_relay]) do
conn
else
conn
|> render_error(:not_found, "not found")
|> halt()
end
end
def user(conn, %{"nickname" => nickname}) do
with %User{local: true} = user <- User.get_cached_by_nickname(nickname) do
conn
|> put_resp_content_type("application/activity+json")
|> put_view(UserView)
|> render("user.json", %{user: user})
else
nil -> {:error, :not_found}
%{local: false} -> {:error, :not_found}
end
end
def object(%{assigns: assigns} = conn, _) do
with ap_id <- Endpoint.url() <> conn.request_path,
%Object{} = object <- Object.get_cached_by_ap_id(ap_id),
user <- Map.get(assigns, :user, nil),
{_, true} <- {:visible?, Visibility.visible_for_user?(object, user)} do
conn
|> maybe_skip_cache(user)
|> assign(:tracking_fun_data, object.id)
|> set_cache_ttl_for(object)
|> put_resp_content_type("application/activity+json")
|> put_view(ObjectView)
|> render("object.json", object: object)
else
{:visible?, false} -> {:error, :not_found}
nil -> {:error, :not_found}
end
end
def track_object_fetch(conn, nil), do: conn
def track_object_fetch(conn, object_id) do
with %{assigns: %{user: %User{id: user_id}}} <- conn do
Delivery.create(object_id, user_id)
end
conn
end
def activity(%{assigns: assigns} = conn, _) do
with ap_id <- Endpoint.url() <> conn.request_path,
%Activity{} = activity <- Activity.normalize(ap_id),
{_, true} <- {:local?, activity.local},
user <- Map.get(assigns, :user, nil),
{_, true} <- {:visible?, Visibility.visible_for_user?(activity, user)} do
conn
|> maybe_skip_cache(user)
|> maybe_set_tracking_data(activity)
|> set_cache_ttl_for(activity)
|> put_resp_content_type("application/activity+json")
|> put_view(ObjectView)
|> render("object.json", object: activity)
else
{:visible?, false} -> {:error, :not_found}
{:local?, false} -> {:error, :not_found}
nil -> {:error, :not_found}
end
end
defp maybe_set_tracking_data(conn, %Activity{data: %{"type" => "Create"}} = activity) do
object_id = Object.normalize(activity, fetch: false).id
assign(conn, :tracking_fun_data, object_id)
end
defp maybe_set_tracking_data(conn, _activity), do: conn
defp set_cache_ttl_for(conn, %Activity{object: object}) do
set_cache_ttl_for(conn, object)
end
defp set_cache_ttl_for(conn, entity) do
ttl =
case entity do
%Object{data: %{"type" => "Question"}} ->
Pleroma.Config.get([:web_cache_ttl, :activity_pub_question])
%Object{} ->
Pleroma.Config.get([:web_cache_ttl, :activity_pub])
_ ->
nil
end
assign(conn, :cache_ttl, ttl)
end
def maybe_skip_cache(conn, user) do
if user do
conn
|> assign(:skip_cache, true)
else
conn
end
end
# GET /relay/following
def relay_following(conn, _params) do
with %{halted: false} = conn <- FederatingPlug.call(conn, []) do
conn
|> put_resp_content_type("application/activity+json")
|> put_view(UserView)
|> render("following.json", %{user: Relay.get_actor()})
end
end
def following(%{assigns: %{user: for_user}} = conn, %{"nickname" => nickname, "page" => page}) do
with %User{} = user <- User.get_cached_by_nickname(nickname),
{:show_follows, true} <-
{:show_follows, (for_user && for_user == user) || !user.hide_follows} do
{page, _} = Integer.parse(page)
conn
|> put_resp_content_type("application/activity+json")
|> put_view(UserView)
|> render("following.json", %{user: user, page: page, for: for_user})
else
{:show_follows, _} ->
conn
|> put_resp_content_type("application/activity+json")
|> send_resp(403, "")
end
end
def following(%{assigns: %{user: for_user}} = conn, %{"nickname" => nickname}) do
with %User{} = user <- User.get_cached_by_nickname(nickname) do
conn
|> put_resp_content_type("application/activity+json")
|> put_view(UserView)
|> render("following.json", %{user: user, for: for_user})
end
end
# GET /relay/followers
def relay_followers(conn, _params) do
with %{halted: false} = conn <- FederatingPlug.call(conn, []) do
conn
|> put_resp_content_type("application/activity+json")
|> put_view(UserView)
|> render("followers.json", %{user: Relay.get_actor()})
end
end
def followers(%{assigns: %{user: for_user}} = conn, %{"nickname" => nickname, "page" => page}) do
with %User{} = user <- User.get_cached_by_nickname(nickname),
{:show_followers, true} <-
{:show_followers, (for_user && for_user == user) || !user.hide_followers} do
{page, _} = Integer.parse(page)
conn
|> put_resp_content_type("application/activity+json")
|> put_view(UserView)
|> render("followers.json", %{user: user, page: page, for: for_user})
else
{:show_followers, _} ->
conn
|> put_resp_content_type("application/activity+json")
|> send_resp(403, "")
end
end
def followers(%{assigns: %{user: for_user}} = conn, %{"nickname" => nickname}) do
with %User{} = user <- User.get_cached_by_nickname(nickname) do
conn
|> put_resp_content_type("application/activity+json")
|> put_view(UserView)
|> render("followers.json", %{user: user, for: for_user})
end
end
def outbox(
%{assigns: %{user: for_user}} = conn,
%{"nickname" => nickname, "page" => page?} = params
)
when page? in [true, "true"] do
with %User{} = user <- User.get_cached_by_nickname(nickname) do
# "include_poll_votes" is a hack because postgres generates inefficient
# queries when filtering by 'Answer', poll votes will be hidden by the
# visibility filter in this case anyway
params =
params
|> Map.drop(["nickname", "page"])
|> Map.put("include_poll_votes", true)
|> Map.new(fn {k, v} -> {String.to_existing_atom(k), v} end)
activities = ActivityPub.fetch_user_activities(user, for_user, params)
conn
|> put_resp_content_type("application/activity+json")
|> put_view(UserView)
|> render("activity_collection_page.json", %{
activities: activities,
pagination: ControllerHelper.get_pagination_fields(conn, activities),
iri: "#{user.ap_id}/outbox"
})
end
end
def outbox(conn, %{"nickname" => nickname}) do
with %User{} = user <- User.get_cached_by_nickname(nickname) do
conn
|> put_resp_content_type("application/activity+json")
|> put_view(UserView)
|> render("activity_collection.json", %{iri: "#{user.ap_id}/outbox"})
end
end
def inbox(%{assigns: %{valid_signature: true}} = conn, %{"nickname" => nickname} = params) do
with {:recipient_exists, %User{} = recipient} <-
{:recipient_exists, User.get_cached_by_nickname(nickname)},
{:sender_exists, {:ok, %User{} = actor}} <-
{:sender_exists, User.get_or_fetch_by_ap_id(params["actor"])},
{:recipient_active, true} <- {:recipient_active, recipient.is_active},
{:sender_active, true} <- {:sender_active, actor.is_active},
true <- Utils.recipient_in_message(recipient, actor, params),
params <- Utils.maybe_splice_recipient(recipient.ap_id, params) do
Federator.incoming_ap_doc(params)
json(conn, "ok")
else
{:recipient_exists, _} ->
conn
|> put_status(:not_found)
|> json("User does not exist")
{:sender_exists, _} ->
conn
|> put_status(:not_found)
|> json("Sender does not exist")
{:recipient_active, _} ->
conn
|> put_status(:not_found)
|> json("User deactivated")
{:sender_active, _} ->
conn
|> put_status(:not_found)
|> json("Sender deactivated")
_ ->
conn
|> put_status(:bad_request)
|> json("Invalid request.")
end
end
def inbox(%{assigns: %{valid_signature: true}} = conn, params) do
Federator.incoming_ap_doc(params)
json(conn, "ok")
end
def inbox(%{assigns: %{valid_signature: false}} = conn, params) do
Federator.incoming_ap_doc(%{
method: conn.method,
req_headers: conn.req_headers,
request_path: conn.request_path,
params: params,
query_string: conn.query_string
})
json(conn, "ok")
end
# POST /relay/inbox -or- POST /internal/fetch/inbox
def inbox(conn, %{"type" => "Create"} = params) do
if FederatingPlug.federating?() do
post_inbox_relayed_create(conn, params)
else
conn
|> put_status(403)
|> json("Not federating")
end
end
def inbox(conn, _params) do
conn
|> put_status(:bad_request)
|> json("error, missing HTTP Signature")
end
defp post_inbox_relayed_create(conn, params) do
Logger.debug(
"Signature missing or not from author, relayed Create message, fetching object from source"
)
Fetcher.fetch_object_from_id(params["object"]["id"])
json(conn, "ok")
end
defp represent_service_actor(%User{} = user, conn) do
conn
|> put_resp_content_type("application/activity+json")
|> put_view(UserView)
|> render("user.json", %{user: user})
end
defp represent_service_actor(nil, _), do: {:error, :not_found}
def relay(conn, _params) do
Relay.get_actor()
|> represent_service_actor(conn)
end
def internal_fetch(conn, _params) do
InternalFetchActor.get_actor()
|> represent_service_actor(conn)
end
@doc "Returns the authenticated user's ActivityPub User object or a 404 Not Found if non-authenticated"
def whoami(%{assigns: %{user: %User{} = user}} = conn, _params) do
conn
|> put_resp_content_type("application/activity+json")
|> put_view(UserView)
|> render("user.json", %{user: user})
end
def read_inbox(
%{assigns: %{user: %User{nickname: nickname} = user}} = conn,
%{"nickname" => nickname, "page" => page?} = params
)
when page? in [true, "true"] do
params =
params
|> Map.drop(["nickname", "page"])
|> Map.put("blocking_user", user)
|> Map.put("user", user)
|> Map.new(fn {k, v} -> {String.to_existing_atom(k), v} end)
activities =
[user.ap_id | User.following(user)]
|> ActivityPub.fetch_activities(params)
|> Enum.reverse()
conn
|> put_resp_content_type("application/activity+json")
|> put_view(UserView)
|> render("activity_collection_page.json", %{
activities: activities,
pagination: ControllerHelper.get_pagination_fields(conn, activities),
iri: "#{user.ap_id}/inbox"
})
end
def read_inbox(%{assigns: %{user: %User{nickname: nickname} = user}} = conn, %{
"nickname" => nickname
}) do
conn
|> put_resp_content_type("application/activity+json")
|> put_view(UserView)
|> render("activity_collection.json", %{iri: "#{user.ap_id}/inbox"})
end
def read_inbox(%{assigns: %{user: %User{nickname: as_nickname}}} = conn, %{
"nickname" => nickname
}) do
err =
dgettext("errors", "can't read inbox of %{nickname} as %{as_nickname}",
nickname: nickname,
as_nickname: as_nickname
)
conn
|> put_status(:forbidden)
|> json(err)
end
defp fix_user_message(%User{ap_id: actor}, %{"type" => "Create", "object" => object} = activity)
when is_map(object) do
length =
[object["content"], object["summary"], object["name"]]
|> Enum.filter(&is_binary(&1))
|> Enum.join("")
|> String.length()
limit = Pleroma.Config.get([:instance, :limit])
if length < limit do
object =
object
|> Transmogrifier.strip_internal_fields()
|> Map.put("attributedTo", actor)
|> Map.put("actor", actor)
|> Map.put("id", Utils.generate_object_id())
{:ok, Map.put(activity, "object", object)}
else
{:error,
dgettext(
"errors",
"Character limit (%{limit} characters) exceeded, contains %{length} characters",
limit: limit,
length: length
)}
end
end
defp fix_user_message(
%User{ap_id: actor} = user,
%{"type" => "Delete", "object" => object} = activity
) do
with {_, %Object{data: object_data}} <- {:normalize, Object.normalize(object, fetch: false)},
{_, true} <- {:permission, user.is_moderator || actor == object_data["actor"]} do
{:ok, activity}
else
{:normalize, _} ->
{:error, "No such object found"}
{:permission, _} ->
{:forbidden, "You can't delete this object"}
end
end
defp fix_user_message(%User{}, activity) do
{:ok, activity}
end
def update_outbox(
%{assigns: %{user: %User{nickname: nickname, ap_id: actor} = user}} = conn,
%{"nickname" => nickname} = params
) do
params =
params
|> Map.drop(["nickname"])
|> Map.put("id", Utils.generate_activity_id())
|> Map.put("actor", actor)
with {:ok, params} <- fix_user_message(user, params),
{:ok, activity, _} <- Pipeline.common_pipeline(params, local: true),
%Activity{data: activity_data} <- Activity.normalize(activity) do
conn
|> put_status(:created)
|> put_resp_header("location", activity_data["id"])
|> json(activity_data)
else
{:forbidden, message} ->
conn
|> put_status(:forbidden)
|> json(message)
{:error, message} when is_binary(message) ->
conn
|> put_status(:bad_request)
|> json(message)
e ->
Logger.warning(fn -> "AP C2S: #{inspect(e)}" end)
conn
|> put_status(:bad_request)
|> json("Bad Request")
end
end
def update_outbox(%{assigns: %{user: %User{} = user}} = conn, %{"nickname" => nickname}) do
err =
dgettext("errors", "can't update outbox of %{nickname} as %{as_nickname}",
nickname: nickname,
as_nickname: user.nickname
)
conn
|> put_status(:forbidden)
|> json(err)
end
defp errors(conn, {:error, :not_found}) do
conn
|> put_status(:not_found)
|> json(dgettext("errors", "Not found"))
end
defp errors(conn, _e) do
conn
|> put_status(:internal_server_error)
|> json(dgettext("errors", "error"))
end
defp log_inbox_metadata(%{params: %{"actor" => actor, "type" => type}} = conn, _) do
Logger.metadata(actor: actor, type: type)
conn
end
defp log_inbox_metadata(conn, _), do: conn
def upload_media(%{assigns: %{user: %User{} = user}} = conn, %{"file" => file} = data) do
with {:ok, object} <-
ActivityPub.upload(
file,
actor: User.ap_id(user),
description: Map.get(data, "description")
) do
Logger.debug(inspect(object))
conn
|> put_status(:created)
|> json(object.data)
end
end
def pinned(conn, %{"nickname" => nickname}) do
with %User{} = user <- User.get_cached_by_nickname(nickname) do
conn
|> put_resp_header("content-type", "application/activity+json")
|> json(UserView.render("featured.json", %{user: user}))
end
end
end

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activity_pub_controller.ex (17 KB)

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