akkoma/lib/pleroma/web/websub/websub.ex

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defmodule Pleroma.Web.Websub do
alias Ecto.Changeset
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alias Pleroma.Repo
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alias Pleroma.Web.Websub.WebsubServerSubscription
alias Pleroma.Web.OStatus.FeedRepresenter
alias Pleroma.Web.OStatus
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import Ecto.Query
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@websub_verifier Application.get_env(:pleroma, :websub_verifier)
def verify(subscription, getter \\ &HTTPoison.get/3) do
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challenge = Base.encode16(:crypto.strong_rand_bytes(8))
lease_seconds = NaiveDateTime.diff(subscription.valid_until, subscription.updated_at)
lease_seconds = lease_seconds |> to_string
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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]),
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^challenge <- response.body
do
changeset = Changeset.change(subscription, %{state: "active"})
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Repo.update(changeset)
else _e ->
changeset = Changeset.change(subscription, %{state: "rejected"})
{:ok, subscription} = Repo.update(changeset)
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{:error, subscription}
end
end
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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])
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|> :xmerl.export_simple(:xmerl_xml)
signature = Base.encode16(:crypto.hmac(:sha, sub.secret, response))
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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
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end