+
+ 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 = user
+ |> FeedRepresenter.to_simple_form([activity], [user])
+ |> :xmerl.export_simple(:xmerl_xml)
+
+ signature = Base.encode16(:crypto.hmac(:sha, sub.secret, response))
+
+ 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 = Changeset.change(subscription, data)
+ websub = Repo.insert_or_update!(change)
+
+ 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)
+
+ {: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