Refactor code to comply with credo suggestions

[akkoma] / lib / pleroma / web / websub / websub.ex

diff --git a/lib/pleroma/web/websub/websub.ex b/lib/pleroma/web/websub/websub.ex
index c7752487c296bde7e32571d21fbdc849d0a08d61..ba699db2462c5b31cb9a5df6d1c82cef77b0170b 100644 (file)
--- a/lib/pleroma/web/websub/websub.ex
+++ b/lib/pleroma/web/websub/websub.ex
@@ -1,23 +1,107 @@
 defmodule Pleroma.Web.Websub do
+  alias Ecto.Changeset
   alias Pleroma.Repo
+  alias Pleroma.Web.Websub.WebsubServerSubscription
+  alias Pleroma.Web.OStatus.FeedRepresenter
+  alias Pleroma.Web.OStatus
 
-  def verify(subscription, getter \\ &HTTPoison.get/3 ) do
+  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.inserted_at, subscription.valid_until)
-    with {:ok, response} <- getter.(subscription.callback, [], [params: %{
-                                                              "hub.challenge": challenge,
-                                                              "hub.lease_seconds": lease_seconds,
-                                                              "hub.topic": subscription.topic,
-                                                              "hub.mode": "subscribe"
-                                                                }]),
+    lease_seconds = NaiveDateTime.diff(subscription.valid_until, subscription.updated_at)
+    lease_seconds = lease_seconds |> to_string
+
+    params = %{
+      "hub.challenge": challenge,
+      "hub.lease_seconds": lease_seconds,
+      "hub.topic": subscription.topic,
+      "hub.mode": "subscribe"
+    }
+
+    url = hd(String.split(subscription.callback, "?"))
+    query = URI.parse(subscription.callback).query || ""
+    params = Map.merge(params, URI.decode_query(query))
+    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
+
+  def publish(topic, user, activity) do
+    query = from sub in WebsubServerSubscription,
+    where: sub.topic == ^topic and sub.state == "active"
+    subscriptions = Repo.all(query)
+    Enum.each(subscriptions, fn(sub) ->
+      response = user
+      |> FeedRepresenter.to_simple_form([activity], [user])
+      |> :xmerl.export_simple(:xmerl_xml)
+
+      signature = Base.encode16(:crypto.hmac(:sha, sub.secret, response))
+
+      HTTPoison.post(sub.callback, response, [
+            {"Content-Type", "application/atom+xml"},
+            {"X-Hub-Signature", "sha1=#{signature}"}
+          ])
+    end)
+  end
+
+  def incoming_subscription_request(user, %{"hub.mode" => "subscribe"} = 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 = Changeset.change(subscription, data)
+      websub = Repo.insert_or_update!(change)
+
+      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)
+
+      {: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