git.squeep.com Git - akkoma/blob - lib/pleroma/web/websub/websub.ex

   1 defmodule Pleroma.Web.Websub do
   2   alias Pleroma.Repo
   3   alias Pleroma.Web.Websub.{WebsubServerSubscription, WebsubClientSubscription}
   4   alias Pleroma.Web.OStatus.FeedRepresenter
   5   alias Pleroma.Web.OStatus
   6
   7   import Ecto.Query
   8
   9   def verify(subscription, getter \\ &HTTPoison.get/3 ) do
  10     challenge = Base.encode16(:crypto.strong_rand_bytes(8))
  11     lease_seconds = NaiveDateTime.diff(subscription.valid_until, subscription.updated_at) |> to_string
  12
  13     params = %{
  14       "hub.challenge": challenge,
  15       "hub.lease_seconds": lease_seconds,
  16       "hub.topic": subscription.topic,
  17       "hub.mode": "subscribe"
  18     }
  19
  20     url = hd(String.split(subscription.callback, "?"))
  21     query = URI.parse(subscription.callback).query || ""
  22     params = Map.merge(params, URI.decode_query(query))
  23     with {:ok, response} <- getter.(url, [], [params: params]),
  24          ^challenge <- response.body
  25     do
  26       changeset = Ecto.Changeset.change(subscription, %{state: "active"})
  27       Repo.update(changeset)
  28     else _e ->
  29       changeset = Ecto.Changeset.change(subscription, %{state: "rejected"})
  30       {:ok, subscription } = Repo.update(changeset)
  31       {:error, subscription}
  32     end
  33   end
  34
  35   def publish(topic, user, activity) do
  36     query = from sub in WebsubServerSubscription,
  37     where: sub.topic == ^topic and sub.state == "active"
  38     subscriptions = Repo.all(query)
  39     Enum.each(subscriptions, fn(sub) ->
  40       response = FeedRepresenter.to_simple_form(user, [activity], [user])
  41       |> :xmerl.export_simple(:xmerl_xml)
  42
  43       signature = :crypto.hmac(:sha, sub.secret, response) |> Base.encode16
  44
  45       HTTPoison.post(sub.callback, response, [
  46             {"Content-Type", "application/atom+xml"},
  47             {"X-Hub-Signature", "sha1=#{signature}"}
  48           ])
  49     end)
  50   end
  51
  52   def incoming_subscription_request(user, %{"hub.mode" => "subscribe"} = params) do
  53     with {:ok, topic} <- valid_topic(params, user),
  54          {:ok, lease_time} <- lease_time(params),
  55          secret <- params["hub.secret"],
  56          callback <- params["hub.callback"]
  57     do
  58       subscription = get_subscription(topic, callback)
  59       data = %{
  60         state: subscription.state || "requested",
  61         topic: topic,
  62         secret: secret,
  63         callback: callback
  64       }
  65
  66       change = Ecto.Changeset.change(subscription, data)
  67       websub = Repo.insert_or_update!(change)
  68
  69       change = Ecto.Changeset.change(websub, %{valid_until: NaiveDateTime.add(websub.updated_at, lease_time)})
  70       websub = Repo.update!(change)
  71
  72       Pleroma.Web.Federator.enqueue(:verify_websub, websub)
  73
  74       {:ok, websub}
  75     else {:error, reason} ->
  76       {:error, reason}
  77     end
  78   end
  79
  80   defp get_subscription(topic, callback) do
  81     Repo.get_by(WebsubServerSubscription, topic: topic, callback: callback) || %WebsubServerSubscription{}
  82   end
  83
  84   defp lease_time(%{"hub.lease_seconds" => lease_seconds}) do
  85     {:ok, String.to_integer(lease_seconds)}
  86   end
  87
  88   defp lease_time(_) do
  89     {:ok, 60 * 60 * 24 * 3} # three days
  90   end
  91
  92   defp valid_topic(%{"hub.topic" => topic}, user) do
  93     if topic == OStatus.feed_path(user) do
  94       {:ok, topic}
  95     else
  96       {:error, "Wrong topic requested, expected #{OStatus.feed_path(user)}, got #{topic}"}
  97     end
  98   end
  99
 100   def subscribe(user, topic) do
 101     # Race condition, use transactions
 102     {:ok, subscription} = with subscription when not is_nil(subscription) <- Repo.get_by(WebsubClientSubscription, topic: topic) do
 103       subscribers = [user.ap_id, subscription.subcribers] |> Enum.uniq
 104       change = Ecto.Changeset.change(subscription, %{subscribers: subscribers})
 105       Repo.update(change)
 106     else _e ->
 107       subscription = %WebsubClientSubscription{
 108         topic: topic,
 109         subscribers: [user.ap_id],
 110         state: "requested",
 111         secret: :crypto.strong_rand_bytes(8) |> Base.url_encode64
 112       }
 113       Repo.insert(subscription)
 114     end
 115
 116     {:ok, subscription}
 117   end
 118 end