akkoma/lib/pleroma/web/websub/websub.ex

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# Pleroma: A lightweight social networking server
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# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.Web.Websub do
alias Ecto.Changeset
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alias Pleroma.Repo
alias Pleroma.Web.Websub.{WebsubServerSubscription, WebsubClientSubscription}
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alias Pleroma.Web.OStatus.FeedRepresenter
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alias Pleroma.Web.{XML, Endpoint, OStatus, Federator}
alias Pleroma.Web.Router.Helpers
require Logger
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import Ecto.Query
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@httpoison Application.get_env(:pleroma, :httpoison)
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def verify(subscription, getter \\ &@httpoison.get/3) do
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challenge = Base.encode16(:crypto.strong_rand_bytes(8))
lease_seconds = NaiveDateTime.diff(subscription.valid_until, subscription.updated_at)
lease_seconds = lease_seconds |> to_string
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params = %{
"hub.challenge": challenge,
"hub.lease_seconds": lease_seconds,
"hub.topic": subscription.topic,
"hub.mode": "subscribe"
}
url = hd(String.split(subscription.callback, "?"))
query = URI.parse(subscription.callback).query || ""
params = Map.merge(params, URI.decode_query(query))
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with {:ok, response} <- getter.(url, [], params: params),
^challenge <- response.body do
changeset = Changeset.change(subscription, %{state: "active"})
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Repo.update(changeset)
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else
e ->
Logger.debug("Couldn't verify subscription")
Logger.debug(inspect(e))
{:error, subscription}
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end
end
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@supported_activities [
"Create",
"Follow",
"Like",
"Announce",
"Undo",
"Delete"
]
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def publish(topic, user, %{data: %{"type" => type}} = activity)
when type in @supported_activities do
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# TODO: Only send to still valid subscriptions.
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query =
from(
sub in WebsubServerSubscription,
where: sub.topic == ^topic and sub.state == "active",
where: fragment("? > NOW()", sub.valid_until)
)
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subscriptions = Repo.all(query)
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Enum.each(subscriptions, fn sub ->
response =
user
|> FeedRepresenter.to_simple_form([activity], [user])
|> :xmerl.export_simple(:xmerl_xml)
|> to_string
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data = %{
xml: response,
topic: topic,
callback: sub.callback,
secret: sub.secret
}
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Federator.publish_single_websub(data)
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end)
end
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def publish(_, _, _), do: ""
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def sign(secret, doc) do
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:crypto.hmac(:sha, secret, to_string(doc)) |> Base.encode16() |> String.downcase()
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end
def incoming_subscription_request(user, %{"hub.mode" => "subscribe"} = params) do
with {:ok, topic} <- valid_topic(params, user),
{:ok, lease_time} <- lease_time(params),
secret <- params["hub.secret"],
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callback <- params["hub.callback"] do
subscription = get_subscription(topic, callback)
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data = %{
state: subscription.state || "requested",
topic: topic,
secret: secret,
callback: callback
}
change = Changeset.change(subscription, data)
websub = Repo.insert_or_update!(change)
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change =
Changeset.change(websub, %{valid_until: NaiveDateTime.add(websub.updated_at, lease_time)})
websub = Repo.update!(change)
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Federator.verify_websub(websub)
{:ok, websub}
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else
{:error, reason} ->
Logger.debug("Couldn't create subscription")
Logger.debug(inspect(reason))
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{:error, reason}
end
end
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def incoming_subscription_request(user, params) do
Logger.info("Unhandled WebSub request for #{user.nickname}: #{inspect(params)}")
{:error, "Invalid WebSub request"}
end
defp get_subscription(topic, callback) do
Repo.get_by(WebsubServerSubscription, topic: topic, callback: callback) ||
%WebsubServerSubscription{}
end
# Temp hack for mastodon.
defp lease_time(%{"hub.lease_seconds" => ""}) do
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# three days
{:ok, 60 * 60 * 24 * 3}
end
defp lease_time(%{"hub.lease_seconds" => lease_seconds}) do
{:ok, String.to_integer(lease_seconds)}
end
defp lease_time(_) do
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# three days
{:ok, 60 * 60 * 24 * 3}
end
defp valid_topic(%{"hub.topic" => topic}, user) do
if topic == OStatus.feed_path(user) do
{:ok, OStatus.feed_path(user)}
else
{:error, "Wrong topic requested, expected #{OStatus.feed_path(user)}, got #{topic}"}
end
end
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def subscribe(subscriber, subscribed, requester \\ &request_subscription/1) do
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topic = subscribed.info.topic
# FIXME: Race condition, use transactions
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{:ok, subscription} =
with subscription when not is_nil(subscription) <-
Repo.get_by(WebsubClientSubscription, topic: topic) do
subscribers = [subscriber.ap_id | subscription.subscribers] |> Enum.uniq()
change = Ecto.Changeset.change(subscription, %{subscribers: subscribers})
Repo.update(change)
else
_e ->
subscription = %WebsubClientSubscription{
topic: topic,
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hub: subscribed.info.hub,
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subscribers: [subscriber.ap_id],
state: "requested",
secret: :crypto.strong_rand_bytes(8) |> Base.url_encode64(),
user: subscribed
}
Repo.insert(subscription)
end
requester.(subscription)
end
def gather_feed_data(topic, getter \\ &@httpoison.get/1) do
with {:ok, response} <- getter.(topic),
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status when status in 200..299 <- response.status,
body <- response.body,
doc <- XML.parse_document(body),
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uri when not is_nil(uri) <- XML.string_from_xpath("/feed/author[1]/uri", doc),
hub when not is_nil(hub) <- XML.string_from_xpath(~S{/feed/link[@rel="hub"]/@href}, doc) do
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name = XML.string_from_xpath("/feed/author[1]/name", doc)
preferredUsername = XML.string_from_xpath("/feed/author[1]/poco:preferredUsername", doc)
displayName = XML.string_from_xpath("/feed/author[1]/poco:displayName", doc)
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avatar = OStatus.make_avatar_object(doc)
bio = XML.string_from_xpath("/feed/author[1]/summary", doc)
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{:ok,
%{
"uri" => uri,
"hub" => hub,
"nickname" => preferredUsername || name,
"name" => displayName || name,
"host" => URI.parse(uri).host,
"avatar" => avatar,
"bio" => bio
}}
else
e ->
{:error, e}
end
end
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def request_subscription(websub, poster \\ &@httpoison.post/3, timeout \\ 10_000) do
data = [
"hub.mode": "subscribe",
"hub.topic": websub.topic,
"hub.secret": websub.secret,
"hub.callback": Helpers.websub_url(Endpoint, :websub_subscription_confirmation, websub.id)
]
# This checks once a second if we are confirmed yet
websub_checker = fn ->
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helper = fn helper ->
:timer.sleep(1000)
websub = Repo.get_by(WebsubClientSubscription, id: websub.id, state: "accepted")
if websub, do: websub, else: helper.(helper)
end
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helper.(helper)
end
task = Task.async(websub_checker)
with {:ok, %{status: 202}} <-
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poster.(websub.hub, {:form, data}, "Content-type": "application/x-www-form-urlencoded"),
{:ok, websub} <- Task.yield(task, timeout) do
{:ok, websub}
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else
e ->
Task.shutdown(task)
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change = Ecto.Changeset.change(websub, %{state: "rejected"})
{:ok, websub} = Repo.update(change)
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Logger.debug(fn -> "Couldn't confirm subscription: #{inspect(websub)}" end)
Logger.debug(fn -> "error: #{inspect(e)}" end)
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{:error, websub}
end
end
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def refresh_subscriptions(delta \\ 60 * 60 * 24) do
Logger.debug("Refreshing subscriptions")
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cut_off = NaiveDateTime.add(NaiveDateTime.utc_now(), delta)
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query = from(sub in WebsubClientSubscription, where: sub.valid_until < ^cut_off)
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subs = Repo.all(query)
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Enum.each(subs, fn sub ->
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Federator.request_subscription(sub)
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end)
end
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def publish_one(%{xml: xml, topic: topic, callback: callback, secret: secret}) do
signature = sign(secret || "", xml)
Logger.info(fn -> "Pushing #{topic} to #{callback}" end)
with {:ok, %{status: code}} <-
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@httpoison.post(
callback,
xml,
[
{"Content-Type", "application/atom+xml"},
{"X-Hub-Signature", "sha1=#{signature}"}
]
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) do
Logger.info(fn -> "Pushed to #{callback}, code #{code}" end)
{:ok, code}
else
e ->
Logger.debug(fn -> "Couldn't push to #{callback}, #{inspect(e)}" end)
{:error, e}
end
end
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end