Handle incoming websub subscriptions.

lib/pleroma/web/federator/federator.ex

@@ -2,7 +2,7 @@ defmodule Pleroma.Web.Federator do
   alias Pleroma.User
   require Logger
 
-  @websub_verifier Application.get_env(:pleroma, :websub_verifier)
+  @websub Application.get_env(:pleroma, :websub)
 
   def handle(:publish, activity) do
     Logger.debug("Running publish for #{activity.data["id"]}")
@@ -13,7 +13,7 @@ defmodule Pleroma.Web.Federator do
 
   def handle(:verify_websub, websub) do
     Logger.debug("Running websub verification for #{websub.id} (#{websub.topic}, #{websub.callback})")
-    @websub_verifier.verify(websub)
+    @websub.verify(websub)
   end
 
   def handle(type, payload) do

lib/pleroma/web/router.ex

@@ -75,8 +75,9 @@ defmodule Pleroma.Web.Router do
 
     get "/users/:nickname/feed", OStatus.OStatusController, :feed
     post "/users/:nickname/salmon", OStatus.OStatusController, :salmon_incoming
-    post "/push/subscriptions/:id", Websub.WebsubController, :websub_subscription_confirmation
     post "/push/hub/:nickname", Websub.WebsubController, :websub_subscription_request
+    get "/push/subscriptions/:id", Websub.WebsubController, :websub_subscription_confirmation
+    post "/push/subscriptions/:id", Websub.WebsubController, :websub_incoming
   end
 
   scope "/.well-known", Pleroma.Web do

lib/pleroma/web/websub/websub.ex

@@ -42,8 +42,7 @@ defmodule Pleroma.Web.Websub do
       response = FeedRepresenter.to_simple_form(user, [activity], [user])
       |> :xmerl.export_simple(:xmerl_xml)
 
-      signature = :crypto.hmac(:sha, sub.secret, response) |> Base.encode16
-
+      signature = sign(sub.secret, response)
       HTTPoison.post(sub.callback, response, [
             {"Content-Type", "application/atom+xml"},
             {"X-Hub-Signature", "sha1=#{signature}"}
@@ -51,6 +50,10 @@ defmodule Pleroma.Web.Websub do
     end)
   end
 
+  def sign(secret, doc) do
+    :crypto.hmac(:sha, secret, doc) |> Base.encode16
+  end
+
   def incoming_subscription_request(user, %{"hub.mode" => "subscribe"} = params) do
     with {:ok, topic} <- valid_topic(params, user),
          {:ok, lease_time} <- lease_time(params),

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