Only have one subscription per callback.

lib/pleroma/web/websub/websub.ex

@@ -3,12 +3,15 @@ defmodule Pleroma.Web.Websub do
   alias Pleroma.Websub
   alias Pleroma.Web.Websub.WebsubServerSubscription
   alias Pleroma.Web.OStatus.FeedRepresenter
+  alias Pleroma.Web.OStatus
 
   import Ecto.Query
 
+  @websub_verifier Application.get_env(:pleroma, :websub_verifier)
+
   def verify(subscription, getter \\ &HTTPoison.get/3 ) do
     challenge = Base.encode16(:crypto.strong_rand_bytes(8))
-    lease_seconds = NaiveDateTime.diff(subscription.valid_until, subscription.inserted_at) |> to_string
+    lease_seconds = NaiveDateTime.diff(subscription.valid_until, subscription.updated_at) |> to_string
 
     params = %{
       "hub.challenge": challenge,
@@ -48,4 +51,53 @@ defmodule Pleroma.Web.Websub do
           ])
     end)
   end
+
+  def incoming_subscription_request(user, 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)
+
+      # 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
 end

lib/pleroma/web/websub/websub_controller.ex

@@ -1,32 +1,13 @@
 defmodule Pleroma.Web.Websub.WebsubController do
   use Pleroma.Web, :controller
-  alias Pleroma.Web.Websub.WebsubServerSubscription
-  alias Pleroma.{Repo, User}
-  alias Pleroma.Web.OStatus
+  alias Pleroma.User
   alias Pleroma.Web.Websub
+
   def websub_subscription_request(conn, %{"nickname" => nickname} = params) do
     user = User.get_cached_by_nickname(nickname)
 
-    with {:ok, topic} <- valid_topic(params, user),
-         {:ok, lease_time} <- lease_time(params),
-         secret <- params["hub.secret"]
+    with {:ok, _websub} <- Websub.incoming_subscription_request(user, params)
     do
-      data = %{
-        state: "requested",
-        topic: topic,
-        secret: secret,
-        callback: params["hub.callback"]
-      }
-
-      change = Ecto.Changeset.change(%WebsubServerSubscription{}, data)
-      websub = Repo.insert!(change)
-
-      change = Ecto.Changeset.change(websub, %{valid_until: NaiveDateTime.add(websub.inserted_at, lease_time)})
-      websub = Repo.update!(change)
-
-      # Just spawn that for now, maybe pool later.
-      spawn(fn -> Websub.verify(websub) end)
-
       conn
       |> send_resp(202, "Accepted")
     else {:error, reason} ->
@@ -34,20 +15,4 @@ defmodule Pleroma.Web.Websub.WebsubController do
       |> send_resp(500, reason)
     end
   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
 end