Handle incoming websub subscriptions.

lib/pleroma/web/websub/websub_controller.ex

@@ -1,7 +1,11 @@
 defmodule Pleroma.Web.Websub.WebsubController do
   use Pleroma.Web, :controller
-  alias Pleroma.User
+  alias Pleroma.{Repo, User}
   alias Pleroma.Web.Websub
+  alias Pleroma.Web.Websub.WebsubClientSubscription
+  require Logger
+
+  @ostatus Application.get_env(:pleroma, :ostatus)
 
   def websub_subscription_request(conn, %{"nickname" => nickname} = params) do
     user = User.get_cached_by_nickname(nickname)
@@ -16,8 +20,30 @@ defmodule Pleroma.Web.Websub.WebsubController do
     end
   end
 
-  def websub_subscription_confirmation(conn, params) do
-    IO.inspect(params)
-    conn
+  def websub_subscription_confirmation(conn, %{"id" => id, "hub.mode" => "subscribe", "hub.challenge" => challenge, "hub.topic" => topic}) do
+    with %WebsubClientSubscription{} = websub <- Repo.get_by(WebsubClientSubscription, id: id, topic: topic) do
+      change = Ecto.Changeset.change(websub, %{state: "accepted"})
+      {:ok, _websub} = Repo.update(change)
+      conn
+      |> send_resp(200, challenge)
+    else _e ->
+      conn
+      |> send_resp(500, "Error")
+    end
+  end
+
+  def websub_incoming(conn, %{"id" => id}) do
+    with "sha1=" <> signature <- hd(get_req_header(conn, "x-hub-signature")),
+         %WebsubClientSubscription{} = websub <- Repo.get(WebsubClientSubscription, id),
+         {:ok, body, _conn} = read_body(conn),
+         ^signature <- Websub.sign(websub.secret, body) do
+      @ostatus.handle_incoming(body)
+      conn
+      |> send_resp(200, "OK")
+    else _e ->
+      Logger.debug("Can't handle incoming subscription post")
+      conn
+      |> send_resp(500, "Error")
+    end
   end
 end