distraction.party/lib/pleroma/web/activity_pub/activity_pub_controller.ex

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# Pleroma: A lightweight social networking server
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# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.Web.ActivityPub.ActivityPubController do
use Pleroma.Web, :controller
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alias Pleroma.Activity
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alias Pleroma.Delivery
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alias Pleroma.Object
alias Pleroma.Object.Fetcher
alias Pleroma.User
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alias Pleroma.Web.ActivityPub.ActivityPub
alias Pleroma.Web.ActivityPub.Builder
alias Pleroma.Web.ActivityPub.InternalFetchActor
alias Pleroma.Web.ActivityPub.ObjectView
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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
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alias Pleroma.Web.Federator
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alias Pleroma.Web.Plugs.EnsureAuthenticatedPlug
alias Pleroma.Web.Plugs.FederatingPlug
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require Logger
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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])
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plug(
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Pleroma.Web.Plugs.Cache,
[query_params: false, tracking_fun: &__MODULE__.track_object_fetch/2]
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when action in [:activity, :object]
)
plug(:set_requester_reachable when action in [:inbox])
plug(:relay_active? when action in [:relay])
defp relay_active?(conn, _) do
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if Pleroma.Config.get([:instance, :allow_relay]) do
conn
else
conn
|> render_error(:not_found, "not found")
|> halt()
end
end
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def user(conn, %{"nickname" => nickname}) do
with %User{local: true} = user <- User.get_cached_by_nickname(nickname),
{:ok, user} <- User.ensure_keys_present(user) do
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conn
|> put_resp_content_type("application/activity+json")
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|> put_view(UserView)
|> render("user.json", %{user: user})
else
nil -> {:error, :not_found}
%{local: false} -> {:error, :not_found}
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end
end
def object(conn, _) do
with ap_id <- Endpoint.url() <> conn.request_path,
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%Object{} = object <- Object.get_cached_by_ap_id(ap_id),
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{_, true} <- {:public?, Visibility.is_public?(object)} do
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conn
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|> assign(:tracking_fun_data, object.id)
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|> set_cache_ttl_for(object)
|> put_resp_content_type("application/activity+json")
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|> put_view(ObjectView)
|> render("object.json", object: object)
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else
{:public?, false} ->
{:error, :not_found}
end
end
def track_object_fetch(conn, nil), do: conn
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def track_object_fetch(conn, object_id) do
with %{assigns: %{user: %User{id: user_id}}} <- conn do
Delivery.create(object_id, user_id)
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end
conn
end
def activity(conn, _params) do
with ap_id <- Endpoint.url() <> conn.request_path,
%Activity{} = activity <- Activity.normalize(ap_id),
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{_, true} <- {:public?, Visibility.is_public?(activity)} do
conn
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|> maybe_set_tracking_data(activity)
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|> set_cache_ttl_for(activity)
|> put_resp_content_type("application/activity+json")
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|> put_view(ObjectView)
|> render("object.json", object: activity)
else
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{:public?, false} -> {:error, :not_found}
nil -> {:error, :not_found}
end
end
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defp maybe_set_tracking_data(conn, %Activity{data: %{"type" => "Create"}} = activity) do
object_id = Object.normalize(activity).id
assign(conn, :tracking_fun_data, object_id)
end
defp maybe_set_tracking_data(conn, _activity), do: conn
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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
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# 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
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end
def following(%{assigns: %{user: for_user}} = conn, %{"nickname" => nickname, "page" => page}) do
with %User{} = user <- User.get_cached_by_nickname(nickname),
{user, for_user} <- ensure_user_keys_present_and_maybe_refresh_for_user(user, for_user),
{:show_follows, true} <-
{:show_follows, (for_user && for_user == user) || !user.hide_follows} do
{page, _} = Integer.parse(page)
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conn
|> put_resp_content_type("application/activity+json")
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|> 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),
{user, for_user} <- ensure_user_keys_present_and_maybe_refresh_for_user(user, for_user) do
conn
|> put_resp_content_type("application/activity+json")
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|> put_view(UserView)
|> render("following.json", %{user: user, for: for_user})
end
end
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# 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
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end
def followers(%{assigns: %{user: for_user}} = conn, %{"nickname" => nickname, "page" => page}) do
with %User{} = user <- User.get_cached_by_nickname(nickname),
{user, for_user} <- ensure_user_keys_present_and_maybe_refresh_for_user(user, for_user),
{:show_followers, true} <-
{:show_followers, (for_user && for_user == user) || !user.hide_followers} do
{page, _} = Integer.parse(page)
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conn
|> put_resp_content_type("application/activity+json")
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|> 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),
{user, for_user} <- ensure_user_keys_present_and_maybe_refresh_for_user(user, for_user) do
conn
|> put_resp_content_type("application/activity+json")
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|> 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),
{:ok, user} <- User.ensure_keys_present(user) 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)
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|> 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
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with %User{} = user <- User.get_cached_by_nickname(nickname),
{:ok, user} <- User.ensure_keys_present(user) do
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conn
|> put_resp_content_type("application/activity+json")
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|> put_view(UserView)
|> render("activity_collection.json", %{iri: "#{user.ap_id}/outbox"})
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end
end
def inbox(%{assigns: %{valid_signature: true}} = conn, %{"nickname" => nickname} = params) do
with %User{} = recipient <- User.get_cached_by_nickname(nickname),
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{:ok, %User{} = actor} <- User.get_or_fetch_by_ap_id(params["actor"]),
true <- Utils.recipient_in_message(recipient, actor, params),
params <- Utils.maybe_splice_recipient(recipient.ap_id, params) do
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Federator.incoming_ap_doc(params)
json(conn, "ok")
end
end
def inbox(%{assigns: %{valid_signature: true}} = conn, params) do
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Federator.incoming_ap_doc(params)
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json(conn, "ok")
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end
# POST /relay/inbox -or- POST /internal/fetch/inbox
def inbox(conn, params) do
if params["type"] == "Create" && FederatingPlug.federating?() do
post_inbox_relayed_create(conn, params)
else
post_inbox_fallback(conn, params)
end
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 post_inbox_fallback(conn, params) do
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headers = Enum.into(conn.req_headers, %{})
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if headers["signature"] && params["actor"] &&
String.contains?(headers["signature"], params["actor"]) do
Logger.debug(
"Signature validation error for: #{params["actor"]}, make sure you are forwarding the HTTP Host header!"
)
Logger.debug(inspect(conn.req_headers))
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end
conn
|> put_status(:bad_request)
|> json(dgettext("errors", "error"))
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end
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defp represent_service_actor(%User{} = user, conn) do
with {:ok, user} <- User.ensure_keys_present(user) do
conn
|> put_resp_content_type("application/activity+json")
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|> put_view(UserView)
|> render("user.json", %{user: user})
else
nil -> {:error, :not_found}
end
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
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@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")
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|> 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)
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|> Map.new(fn {k, v} -> {String.to_existing_atom(k), v} end)
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activities =
[user.ap_id | User.following(user)]
|> ActivityPub.fetch_activities(params)
|> Enum.reverse()
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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),
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iri: "#{user.ap_id}/inbox"
})
end
def read_inbox(%{assigns: %{user: %User{nickname: nickname} = user}} = conn, %{
"nickname" => nickname
}) do
with {:ok, user} <- User.ensure_keys_present(user) do
conn
|> put_resp_content_type("application/activity+json")
|> put_view(UserView)
|> render("activity_collection.json", %{iri: "#{user.ap_id}/inbox"})
end
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 handle_user_activity(
%User{} = user,
%{"type" => "Create", "object" => %{"type" => "Note"} = object} = params
) do
content = if is_binary(object["content"]), do: object["content"], else: ""
name = if is_binary(object["name"]), do: object["name"], else: ""
summary = if is_binary(object["summary"]), do: object["summary"], else: ""
length = String.length(content <> name <> summary)
if length > Pleroma.Config.get([:instance, :limit]) do
{:error, dgettext("errors", "Note is over the character limit")}
else
object =
object
|> Map.merge(Map.take(params, ["to", "cc"]))
|> Map.put("attributedTo", user.ap_id)
|> Transmogrifier.fix_object()
ActivityPub.create(%{
to: params["to"],
actor: user,
context: object["context"],
object: object,
additional: Map.take(params, ["cc"])
})
end
end
defp handle_user_activity(%User{} = user, %{"type" => "Delete"} = params) do
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with %Object{} = object <- Object.normalize(params["object"]),
true <- user.is_moderator || user.ap_id == object.data["actor"],
{:ok, delete_data, _} <- Builder.delete(user, object.data["id"]),
{:ok, delete, _} <- Pipeline.common_pipeline(delete_data, local: true) do
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{:ok, delete}
else
_ -> {:error, dgettext("errors", "Can't delete object")}
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end
end
defp handle_user_activity(%User{} = user, %{"type" => "Like"} = params) do
with %Object{} = object <- Object.normalize(params["object"]),
{_, {:ok, like_object, meta}} <- {:build_object, Builder.like(user, object)},
{_, {:ok, %Activity{} = activity, _meta}} <-
{:common_pipeline,
Pipeline.common_pipeline(like_object, Keyword.put(meta, :local, true))} do
{:ok, activity}
else
_ -> {:error, dgettext("errors", "Can't like object")}
end
end
defp handle_user_activity(_, _) do
{:error, dgettext("errors", "Unhandled activity type")}
end
def update_outbox(
%{assigns: %{user: %User{nickname: nickname} = user}} = conn,
%{"nickname" => nickname} = params
) do
actor = user.ap_id
params =
params
|> Map.drop(["id"])
|> Map.put("actor", actor)
|> Transmogrifier.fix_addressing()
with {:ok, %Activity{} = activity} <- handle_user_activity(user, params) do
conn
|> put_status(:created)
|> put_resp_header("location", activity.data["id"])
|> json(activity.data)
else
{:error, message} ->
conn
|> put_status(:bad_request)
|> json(message)
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 set_requester_reachable(%Plug.Conn{} = conn, _) do
with actor <- conn.params["actor"],
true <- is_binary(actor) do
Pleroma.Instances.set_reachable(actor)
end
conn
end
defp ensure_user_keys_present_and_maybe_refresh_for_user(user, for_user) do
{:ok, new_user} = User.ensure_keys_present(user)
for_user =
if new_user != user and match?(%User{}, for_user) do
User.get_cached_by_nickname(for_user.nickname)
else
for_user
end
{new_user, for_user}
end
@doc """
Endpoint based on <https://www.w3.org/wiki/SocialCG/ActivityPub/MediaUpload>
Parameters:
- (required) `file`: data of the media
- (optionnal) `description`: description of the media, intended for accessibility
Response:
- HTTP Code: 201 Created
- HTTP Body: ActivityPub object to be inserted into another's `attachment` field
Note: Will not point to a URL with a `Location` header because no standalone Activity has been created.
"""
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
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end