1 files changed, 125 insertions, 20 deletions

diff --git a/lib/pleroma/web/websub/websub.ex b/lib/pleroma/web/websub/websub.ex
index cc66b52dd..7c8efa917 100644
--- a/lib/pleroma/web/websub/websub.ex
+++ b/lib/pleroma/web/websub/websub.ex
@@ -1,16 +1,20 @@
 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
 
-  @websub_verifier Application.get_env(:pleroma, :websub_verifier)
+  @httpoison Application.get_env(:pleroma, :httpoison)
 
-  def verify(subscription, getter \\ &HTTPoison.get/3 ) do
+  def verify(subscription, getter \\ &@httpoison.get/3) do
     challenge = Base.encode16(:crypto.strong_rand_bytes(8))
-    lease_seconds = NaiveDateTime.diff(subscription.valid_until, subscription.updated_at) |> to_string
+    lease_seconds = NaiveDateTime.diff(subscription.valid_until, subscription.updated_at)
+    lease_seconds = lease_seconds |> to_string
 
     params = %{
       "hub.challenge": challenge,
@@ -25,11 +29,11 @@ defmodule Pleroma.Web.Websub do
     with {:ok, response} <- getter.(url, [], [params: params]),
          ^challenge <- response.body
     do
-      changeset = Ecto.Changeset.change(subscription, %{state: "active"})
+      changeset = Changeset.change(subscription, %{state: "active"})
       Repo.update(changeset)
     else _e ->
-      changeset = Ecto.Changeset.change(subscription, %{state: "rejected"})
-      {:ok, subscription } = Repo.update(changeset)
+      changeset = Changeset.change(subscription, %{state: "rejected"})
+      {:ok, subscription} = Repo.update(changeset)
       {:error, subscription}
     end
   end
@@ -39,18 +43,27 @@ defmodule Pleroma.Web.Websub do
     where: sub.topic == ^topic and sub.state == "active"
     subscriptions = Repo.all(query)
     Enum.each(subscriptions, fn(sub) ->
-      response = FeedRepresenter.to_simple_form(user, [activity], [user])
+      response = user
+      |> FeedRepresenter.to_simple_form([activity], [user])
       |> :xmerl.export_simple(:xmerl_xml)
+      |> to_string
 
-      signature = :crypto.hmac(:sha, sub.secret, response) |> Base.encode16
+      signature = sign(sub.secret || "", response)
+      Logger.debug(fn -> "Pushing to #{sub.callback}" end)
 
-      HTTPoison.post(sub.callback, response, [
-            {"Content-Type", "application/atom+xml"},
-            {"X-Hub-Signature", "sha1=#{signature}"}
-          ])
+      Task.start(fn ->
+        @httpoison.post(sub.callback, response, [
+              {"Content-Type", "application/atom+xml"},
+              {"X-Hub-Signature", "sha1=#{signature}"}
+            ])
+      end)
     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),
@@ -65,23 +78,32 @@ defmodule Pleroma.Web.Websub do
         callback: callback
       }
 
-      change = Ecto.Changeset.change(subscription, data)
+      change = Changeset.change(subscription, data)
       websub = Repo.insert_or_update!(change)
 
-      change = Ecto.Changeset.change(websub, %{valid_until: NaiveDateTime.add(websub.updated_at, lease_time)})
+      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)
+      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
 
   defp get_subscription(topic, callback) do
-    Repo.get_by(WebsubServerSubscription, topic: topic, callback: callback) || %WebsubServerSubscription{}
+    Repo.get_by(WebsubServerSubscription, topic: topic, callback: callback) ||
+      %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
@@ -94,9 +116,92 @@ 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(fn -> "Couldn't confirm subscription: #{inspect(websub)}" end)
+      Logger.debug(fn -> "error: #{inspect(e)}" end)
+
+      {:error, websub}
+    end
+  end
 end