3 files changed, 153 insertions, 7 deletions
diff --git a/lib/pleroma/web/websub/websub.ex b/lib/pleroma/web/websub/websub.ex
index ba699db24..afbe944c5 100644
--- a/lib/pleroma/web/websub/websub.ex
+++ b/lib/pleroma/web/websub/websub.ex
@@ -1,9 +1,11 @@
 defmodule Pleroma.Web.Websub do
   alias Ecto.Changeset
   alias Pleroma.Repo
-  alias Pleroma.Web.Websub.WebsubServerSubscription
+  alias Pleroma.Web.Websub.{WebsubServerSubscription, WebsubClientSubscription}
   alias Pleroma.Web.OStatus.FeedRepresenter
-  alias Pleroma.Web.OStatus
+  alias Pleroma.Web.{XML, Endpoint, OStatus}
+  alias Pleroma.Web.Router.Helpers
+  require Logger
 
   import Ecto.Query
 
@@ -44,8 +46,10 @@ defmodule Pleroma.Web.Websub do
       response = user
       |> FeedRepresenter.to_simple_form([activity], [user])
       |> :xmerl.export_simple(:xmerl_xml)
+      |> to_string
 
-      signature = Base.encode16(:crypto.hmac(:sha, sub.secret, response))
+      signature = sign(sub.secret || "", response)
+      Logger.debug("Pushing to #{sub.callback}")
 
       HTTPoison.post(sub.callback, response, [
             {"Content-Type", "application/atom+xml"},
@@ -54,6 +58,10 @@ defmodule Pleroma.Web.Websub do
     end)
   end
 
+  def sign(secret, doc) do
+    :crypto.hmac(:sha, secret, to_string(doc)) |> Base.encode16 |> String.downcase
+  end
+
   def incoming_subscription_request(user, %{"hub.mode" => "subscribe"} = params) do
     with {:ok, topic} <- valid_topic(params, user),
          {:ok, lease_time} <- lease_time(params),
@@ -75,11 +83,13 @@ defmodule Pleroma.Web.Websub do
                                           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)
+      Pleroma.Web.Federator.enqueue(:verify_websub, websub)
 
       {:ok, websub}
     else {:error, reason} ->
+      Logger.debug("Couldn't create subscription.")
+      Logger.debug(inspect(reason))
+
       {:error, reason}
     end
   end
@@ -89,6 +99,11 @@ defmodule Pleroma.Web.Websub do
       %WebsubServerSubscription{}
   end
 
+  # Temp hack for mastodon.
+  defp lease_time(%{"hub.lease_seconds" => ""}) do
+    {:ok, 60 * 60 * 24 * 3} # three days
+  end
+
   defp lease_time(%{"hub.lease_seconds" => lease_seconds}) do
     {:ok, String.to_integer(lease_seconds)}
   end
@@ -99,9 +114,92 @@ defmodule Pleroma.Web.Websub do
 
   defp valid_topic(%{"hub.topic" => topic}, user) do
     if topic == OStatus.feed_path(user) do
-      {:ok, topic}
+      {:ok, OStatus.feed_path(user)}
     else
       {:error, "Wrong topic requested, expected #{OStatus.feed_path(user)}, got #{topic}"}
     end
   end
+
+  def subscribe(subscriber, subscribed, requester \\ &request_subscription/1) do
+    topic = subscribed.info["topic"]
+    # FIXME: Race condition, use transactions
+    {:ok, subscription} = with subscription when not is_nil(subscription) <- Repo.get_by(WebsubClientSubscription, topic: topic) do
+      subscribers = [subscriber.ap_id, subscription.subscribers] |> Enum.uniq
+      change = Ecto.Changeset.change(subscription, %{subscribers: subscribers})
+      Repo.update(change)
+    else _e ->
+      subscription = %WebsubClientSubscription{
+        topic: topic,
+        hub: subscribed.info["hub"],
+        subscribers: [subscriber.ap_id],
+        state: "requested",
+        secret: :crypto.strong_rand_bytes(8) |> Base.url_encode64,
+        user: subscribed
+      }
+      Repo.insert(subscription)
+    end
+    requester.(subscription)
+  end
+
+  def gather_feed_data(topic, getter \\ &HTTPoison.get/1) do
+    with {:ok, response} <- getter.(topic),
+         status_code when status_code in 200..299 <- response.status_code,
+         body <- response.body,
+         doc <- XML.parse_document(body),
+         uri when not is_nil(uri) <- XML.string_from_xpath("/feed/author[1]/uri", doc),
+         hub when not is_nil(hub) <- XML.string_from_xpath(~S{/feed/link[@rel="hub"]/@href}, doc) do
+
+      name = XML.string_from_xpath("/feed/author[1]/name", doc)
+      preferredUsername = XML.string_from_xpath("/feed/author[1]/poco:preferredUsername", doc)
+      displayName = XML.string_from_xpath("/feed/author[1]/poco:displayName", doc)
+      avatar = OStatus.make_avatar_object(doc)
+
+      {:ok, %{
+        "uri" => uri,
+        "hub" => hub,
+        "nickname" => preferredUsername || name,
+        "name" => displayName || name,
+        "host" => URI.parse(uri).host,
+        "avatar" => avatar
+      }}
+    else e ->
+      {:error, e}
+    end
+  end
+
+  def request_subscription(websub, poster \\ &HTTPoison.post/3, timeout \\ 10_000) do
+    data = [
+      "hub.mode": "subscribe",
+      "hub.topic": websub.topic,
+      "hub.secret": websub.secret,
+      "hub.callback": Helpers.websub_url(Endpoint, :websub_subscription_confirmation, websub.id)
+    ]
+
+    # This checks once a second if we are confirmed yet
+    websub_checker = fn ->
+      helper = fn (helper) ->
+        :timer.sleep(1000)
+        websub = Repo.get_by(WebsubClientSubscription, id: websub.id, state: "accepted")
+        if websub, do: websub, else: helper.(helper)
+      end
+      helper.(helper)
+    end
+
+    task = Task.async(websub_checker)
+
+    with {:ok, %{status_code: 202}} <- poster.(websub.hub, {:form, data}, ["Content-type": "application/x-www-form-urlencoded"]),
+         {:ok, websub} <- Task.yield(task, timeout) do
+      {:ok, websub}
+    else e ->
+      Task.shutdown(task)
+
+      change = Ecto.Changeset.change(websub, %{state: "rejected"})
+      {:ok, websub} = Repo.update(change)
+
+      Logger.debug("Couldn't confirm subscription: #{inspect(websub)}")
+      Logger.debug("error: #{inspect(e)}")
+
+      {:error, websub}
+    end
+  end
 end
diff --git a/lib/pleroma/web/websub/websub_client_subscription.ex b/lib/pleroma/web/websub/websub_client_subscription.ex
new file mode 100644
index 000000000..c7a25ea22
--- /dev/null
+++ b/lib/pleroma/web/websub/websub_client_subscription.ex
@@ -0,0 +1,16 @@
+defmodule Pleroma.Web.Websub.WebsubClientSubscription do
+  use Ecto.Schema
+  alias Pleroma.User
+
+  schema "websub_client_subscriptions" do
+    field :topic, :string
+    field :secret, :string
+    field :valid_until, :naive_datetime
+    field :state, :string
+    field :subscribers, {:array, :string}, default: []
+    field :hub, :string
+    belongs_to :user, User
+
+    timestamps()
+  end
+end
diff --git a/lib/pleroma/web/websub/websub_controller.ex b/lib/pleroma/web/websub/websub_controller.ex
index 5d54c6ef5..e860ec9e5 100644
--- a/lib/pleroma/web/websub/websub_controller.ex
+++ b/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)
@@ -15,4 +19,32 @@ defmodule Pleroma.Web.Websub.WebsubController do
       |> send_resp(500, reason)
     end
   end
+
+  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")),
+         signature <- String.downcase(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