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