defmodule Pleroma.Web.Websub do
alias Pleroma.Repo
+ alias Pleroma.Web.Websub.{WebsubServerSubscription, WebsubClientSubscription}
+ alias Pleroma.Web.OStatus.FeedRepresenter
+ alias Pleroma.Web.OStatus
+ alias Pleroma.Web.XML
+ require Logger
+
+ import Ecto.Query
def verify(subscription, getter \\ &HTTPoison.get/3 ) do
challenge = Base.encode16(:crypto.strong_rand_bytes(8))
- lease_seconds = NaiveDateTime.diff(subscription.inserted_at, subscription.valid_until)
- with {:ok, response} <- getter.(subscription.callback, [], [params: %{
- "hub.challenge": challenge,
- "hub.lease_seconds": lease_seconds,
- "hub.topic": subscription.topic,
- "hub.mode": "subscribe"
- }]),
+ lease_seconds = NaiveDateTime.diff(subscription.valid_until, subscription.updated_at) |> to_string
+
+ 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))
+ with {:ok, response} <- getter.(url, [], [params: params]),
^challenge <- response.body
do
changeset = Ecto.Changeset.change(subscription, %{state: "active"})
{:error, subscription}
end
end
+
+ def publish(topic, user, activity) do
+ query = from sub in WebsubServerSubscription,
+ where: sub.topic == ^topic and sub.state == "active"
+ 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
+
+ HTTPoison.post(sub.callback, response, [
+ {"Content-Type", "application/atom+xml"},
+ {"X-Hub-Signature", "sha1=#{signature}"}
+ ])
+ end)
+ 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
+ subscription = get_subscription(topic, callback)
+ data = %{
+ state: subscription.state || "requested",
+ topic: topic,
+ secret: secret,
+ callback: callback
+ }
+
+ change = Ecto.Changeset.change(subscription, data)
+ websub = Repo.insert_or_update!(change)
+
+ change = Ecto.Changeset.change(websub, %{valid_until: NaiveDateTime.add(websub.updated_at, lease_time)})
+ websub = Repo.update!(change)
+
+ Pleroma.Web.Federator.enqueue(:verify_websub, websub)
+
+ {:ok, websub}
+ else {:error, reason} ->
+ {:error, reason}
+ end
+ end
+
+ defp get_subscription(topic, callback) do
+ Repo.get_by(WebsubServerSubscription, topic: topic, callback: callback) || %WebsubServerSubscription{}
+ end
+
+ defp lease_time(%{"hub.lease_seconds" => lease_seconds}) do
+ {:ok, String.to_integer(lease_seconds)}
+ end
+
+ defp lease_time(_) do
+ {:ok, 60 * 60 * 24 * 3} # three days
+ end
+
+ defp valid_topic(%{"hub.topic" => topic}, user) do
+ if topic == OStatus.feed_path(user) do
+ {:ok, topic}
+ else
+ {:error, "Wrong topic requested, expected #{OStatus.feed_path(user)}, got #{topic}"}
+ end
+ end
+
+ def subscribe(user, topic, requester \\ &request_subscription/1) do
+ # FIXME: Race condition, use transactions
+ {:ok, subscription} = with subscription when not is_nil(subscription) <- Repo.get_by(WebsubClientSubscription, topic: topic) do
+ subscribers = [user.ap_id, subscription.subcribers] |> Enum.uniq
+ change = Ecto.Changeset.change(subscription, %{subscribers: subscribers})
+ Repo.update(change)
+ else _e ->
+ subscription = %WebsubClientSubscription{
+ topic: topic,
+ subscribers: [user.ap_id],
+ state: "requested",
+ secret: :crypto.strong_rand_bytes(8) |> Base.url_encode64,
+ user: user
+ }
+ Repo.insert(subscription)
+ end
+ requester.(subscription)
+ end
+
+ def discover(topic, getter \\ &HTTPoison.get/1) do
+ with {:ok, response} <- getter.(topic),
+ status_code when status_code in 200..299 <- response.status_code,
+ body <- response.body,
+ doc <- XML.parse_document(body),
+ url when not is_nil(url) <- XML.string_from_xpath(~S{/feed/link[@rel="self"]/@href}, doc),
+ hub when not is_nil(hub) <- XML.string_from_xpath(~S{/feed/link[@rel="hub"]/@href}, doc) do
+ {:ok, %{url: url, hub: hub}}
+ 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": "https://social.heldscal.la/callback"
+ ]
+
+ # 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_code: 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("Couldn't confirm subscription: #{inspect(websub)}")
+ Logger.debug("error: #{inspect(e)}")
+
+ {:error, websub}
+ end
+ end
end
projects / akkoma / blobdiff