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