108 lines
3.3 KiB
Elixir
108 lines
3.3 KiB
Elixir
defmodule Pleroma.Web.Websub do
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alias Ecto.Changeset
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alias Pleroma.Repo
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alias Pleroma.Web.Websub.WebsubServerSubscription
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alias Pleroma.Web.OStatus.FeedRepresenter
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alias Pleroma.Web.OStatus
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import Ecto.Query
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@websub_verifier Application.get_env(:pleroma, :websub_verifier)
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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
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do
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changeset = Changeset.change(subscription, %{state: "active"})
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Repo.update(changeset)
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else _e ->
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changeset = Changeset.change(subscription, %{state: "rejected"})
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{:ok, subscription} = Repo.update(changeset)
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{:error, subscription}
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end
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end
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def publish(topic, user, activity) do
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query = from sub in WebsubServerSubscription,
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where: sub.topic == ^topic and sub.state == "active"
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subscriptions = Repo.all(query)
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Enum.each(subscriptions, fn(sub) ->
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response = user
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|> FeedRepresenter.to_simple_form([activity], [user])
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|> :xmerl.export_simple(:xmerl_xml)
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signature = Base.encode16(:crypto.hmac(:sha, sub.secret, response))
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HTTPoison.post(sub.callback, response, [
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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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end)
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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"]
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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 = Changeset.change(websub, %{valid_until:
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NaiveDateTime.add(websub.updated_at, lease_time)})
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websub = Repo.update!(change)
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# Just spawn that for now, maybe pool later.
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spawn(fn -> @websub_verifier.verify(websub) end)
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{:ok, websub}
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else {:error, reason} ->
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{:error, reason}
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end
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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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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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{:ok, 60 * 60 * 24 * 3} # three days
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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, topic}
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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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end
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