Add Push notifications backend support

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

lib/service/notifier/push.ex

@@ -3,9 +3,10 @@ defmodule Mobilizon.Service.Notifier.Push do
   WebPush notifier
   """
   alias Mobilizon.Activities.Activity
-  alias Mobilizon.Config
+  alias Mobilizon.{Config, Users}
   alias Mobilizon.Service.Notifier
   alias Mobilizon.Service.Notifier.Push
+  alias Mobilizon.Storage.Page
   alias Mobilizon.Users.User
 
   @behaviour Notifier
@@ -16,17 +17,14 @@ defmodule Mobilizon.Service.Notifier.Push do
   end
 
   @impl Notifier
-  def send(%User{} = _user, %Activity{} = activity) do
-    # Get user's subscriptions
-    activity
-    |> payload()
-
-    # |> WebPushEncryption.send_web_push()
+  def send(%User{id: user_id} = _user, %Activity{} = activity, _opts) do
+    %Page{elements: subscriptions} = Users.list_user_push_subscriptions(user_id, 1, 100)
+    Enum.each(subscriptions, &send_subscription(activity, &1))
   end
 
   @impl Notifier
-  def send(%User{} = user, activities) when is_list(activities) do
-    Enum.each(activities, &Push.send(user, &1))
+  def send(%User{} = user, activities, opts) when is_list(activities) do
+    Enum.each(activities, &Push.send(user, &1, opts))
   end
 
   defp payload(%Activity{subject: subject}) do
@@ -35,4 +33,10 @@ defmodule Mobilizon.Service.Notifier.Push do
     }
     |> Jason.encode!()
   end
+
+  defp send_subscription(activity, subscription) do
+    activity
+    |> payload()
+    |> WebPushEncryption.send_web_push(subscription)
+  end
 end