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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.OStatus.OStatusController do
use Pleroma.Web, :controller
alias Fallback.RedirectController
alias Pleroma.Activity
alias Pleroma.Object
alias Pleroma.User
alias Pleroma.Web.ActivityPub.ActivityPub
alias Pleroma.Web.ActivityPub.ActivityPubController
alias Pleroma.Web.ActivityPub.ObjectView
alias Pleroma.Web.ActivityPub.Visibility
alias Pleroma.Web.Endpoint
alias Pleroma.Web.Federator
alias Pleroma.Web.Metadata.PlayerView
alias Pleroma.Web.OStatus
alias Pleroma.Web.OStatus.ActivityRepresenter
alias Pleroma.Web.OStatus.FeedRepresenter
alias Pleroma.Web.Router
alias Pleroma.Web.XML
plug(
Pleroma.Plugs.RateLimiter,
{:ap_routes, params: ["uuid"]} when action in [:object, :activity]
)
plug(Pleroma.Web.FederatingPlug when action in [:salmon_incoming])
plug(
Pleroma.Plugs.SetFormatPlug
when action in [:feed_redirect, :object, :activity, :notice]
)
action_fallback(:errors)
def feed_redirect(%{assigns: %{format: "html"}} = conn, %{"nickname" => nickname}) do
with {_, %User{} = user} <- {:fetch_user, User.get_cached_by_nickname_or_id(nickname)} do
RedirectController.redirector_with_meta(conn, %{user: user})
end
end
def feed_redirect(%{assigns: %{format: format}} = conn, _params)
when format in ["json", "activity+json"] do
ActivityPubController.call(conn, :user)
end
def feed_redirect(conn, %{"nickname" => nickname}) do
with {_, %User{} = user} <- {:fetch_user, User.get_cached_by_nickname(nickname)} do
redirect(conn, external: OStatus.feed_path(user))
end
end
def feed(conn, %{"nickname" => nickname} = params) do
with {_, %User{} = user} <- {:fetch_user, User.get_cached_by_nickname(nickname)} do
query_params =
Map.take(params, ["max_id"])
|> Map.merge(%{"whole_db" => true, "actor_id" => user.ap_id})
activities =
ActivityPub.fetch_public_activities(query_params)
|> Enum.reverse()
response =
user
|> FeedRepresenter.to_simple_form(activities, [user])
|> :xmerl.export_simple(:xmerl_xml)
|> to_string
conn
|> put_resp_content_type("application/atom+xml")
|> send_resp(200, response)
end
end
defp decode_or_retry(body) do
with {:ok, magic_key} <- Pleroma.Web.Salmon.fetch_magic_key(body),
{:ok, doc} <- Pleroma.Web.Salmon.decode_and_validate(magic_key, body) do
{:ok, doc}
else
_e ->
with [decoded | _] <- Pleroma.Web.Salmon.decode(body),
doc <- XML.parse_document(decoded),
uri when not is_nil(uri) <- XML.string_from_xpath("/entry/author[1]/uri", doc),
{:ok, _} <- Pleroma.Web.OStatus.make_user(uri, true),
{:ok, magic_key} <- Pleroma.Web.Salmon.fetch_magic_key(body),
{:ok, doc} <- Pleroma.Web.Salmon.decode_and_validate(magic_key, body) do
{:ok, doc}
end
end
end
def salmon_incoming(conn, _) do
{:ok, body, _conn} = read_body(conn)
{:ok, doc} = decode_or_retry(body)
Federator.incoming_doc(doc)
conn
|> send_resp(200, "")
end
def object(%{assigns: %{format: format}} = conn, %{"uuid" => _uuid})
when format in ["json", "activity+json"] do
ActivityPubController.call(conn, :object)
end
def object(%{assigns: %{format: format}} = conn, %{"uuid" => uuid}) do
with id <- o_status_url(conn, :object, uuid),
{_, %Activity{} = activity} <-
{:activity, Activity.get_create_by_object_ap_id_with_object(id)},
{_, true} <- {:public?, Visibility.is_public?(activity)},
%User{} = user <- User.get_cached_by_ap_id(activity.data["actor"]) do
case format do
"html" -> redirect(conn, to: "/notice/#{activity.id}")
_ -> represent_activity(conn, nil, activity, user)
end
else
reason when reason in [{:public?, false}, {:activity, nil}] ->
{:error, :not_found}
e ->
e
end
end
def activity(%{assigns: %{format: format}} = conn, %{"uuid" => _uuid})
when format in ["json", "activity+json"] do
ActivityPubController.call(conn, :activity)
end
def activity(%{assigns: %{format: format}} = conn, %{"uuid" => uuid}) do
with id <- o_status_url(conn, :activity, uuid),
{_, %Activity{} = activity} <- {:activity, Activity.normalize(id)},
{_, true} <- {:public?, Visibility.is_public?(activity)},
%User{} = user <- User.get_cached_by_ap_id(activity.data["actor"]) do
case format do
"html" -> redirect(conn, to: "/notice/#{activity.id}")
_ -> represent_activity(conn, format, activity, user)
end
else
reason when reason in [{:public?, false}, {:activity, nil}] ->
{:error, :not_found}
e ->
e
end
end
def notice(%{assigns: %{format: format}} = conn, %{"id" => id}) do
with {_, %Activity{} = activity} <- {:activity, Activity.get_by_id_with_object(id)},
{_, true} <- {:public?, Visibility.is_public?(activity)},
%User{} = user <- User.get_cached_by_ap_id(activity.data["actor"]) do
cond do
format == "html" && activity.data["type"] == "Create" ->
%Object{} = object = Object.normalize(activity)
RedirectController.redirector_with_meta(
conn,
%{
activity_id: activity.id,
object: object,
url: Router.Helpers.o_status_url(Endpoint, :notice, activity.id),
user: user
}
)
format == "html" ->
RedirectController.redirector(conn, nil)
true ->
represent_activity(conn, format, activity, user)
end
else
reason when reason in [{:public?, false}, {:activity, nil}] ->
conn
|> put_status(404)
|> RedirectController.redirector(nil, 404)
e ->
e
end
end
# Returns an HTML embedded <audio> or <video> player suitable for embed iframes.
def notice_player(conn, %{"id" => id}) do
with %Activity{data: %{"type" => "Create"}} = activity <- Activity.get_by_id_with_object(id),
true <- Visibility.is_public?(activity),
%Object{} = object <- Object.normalize(activity),
%{data: %{"attachment" => [%{"url" => [url | _]} | _]}} <- object,
true <- String.starts_with?(url["mediaType"], ["audio", "video"]) do
conn
|> put_layout(:metadata_player)
|> put_resp_header("x-frame-options", "ALLOW")
|> put_resp_header(
"content-security-policy",
"default-src 'none';style-src 'self' 'unsafe-inline';img-src 'self' data: https:; media-src 'self' https:;"
)
|> put_view(PlayerView)
|> render("player.html", url)
else
_error ->
conn
|> put_status(404)
|> RedirectController.redirector(nil, 404)
end
end
defp represent_activity(
conn,
"activity+json",
%Activity{data: %{"type" => "Create"}} = activity,
_user
) do
object = Object.normalize(activity)
conn
|> put_resp_header("content-type", "application/activity+json")
|> json(ObjectView.render("object.json", %{object: object}))
end
defp represent_activity(_conn, "activity+json", _, _) do
{:error, :not_found}
end
defp represent_activity(conn, _, activity, user) do
response =
activity
|> ActivityRepresenter.to_simple_form(user, true)
|> ActivityRepresenter.wrap_with_entry()
|> :xmerl.export_simple(:xmerl_xml)
|> to_string
conn
|> put_resp_content_type("application/atom+xml")
|> send_resp(200, response)
end
def errors(conn, {:error, :not_found}) do
render_error(conn, :not_found, "Not found")
end
def errors(conn, {:fetch_user, nil}), do: errors(conn, {:error, :not_found})
def errors(conn, _) do
render_error(conn, :internal_server_error, "Something went wrong")
end
end
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