Add Push notifications backend support

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

lib/graphql/schema/users/push_subscription.ex

@@ -0,0 +1,34 @@
+defmodule Mobilizon.GraphQL.Schema.Users.PushSubscription do
+  @moduledoc """
+  Schema representation for PushSubscription
+  """
+  use Absinthe.Schema.Notation
+  alias Mobilizon.GraphQL.Resolvers.PushSubscription
+
+  @desc """
+  An object representing the keys for a push subscription
+  """
+  input_object :push_subscription_keys do
+    field(:p256dh, non_null(:string))
+    field(:auth, non_null(:string))
+  end
+
+  object :push_queries do
+    field :list_push_subscriptions, :paginated_push_subscription_list do
+      resolve(&PushSubscription.list_user_push_subscriptions/3)
+    end
+  end
+
+  object :push_mutations do
+    field :register_push_mutation, :string do
+      arg(:endpoint, non_null(:string))
+      arg(:keys, non_null(:push_subscription_keys))
+      resolve(&PushSubscription.register_push_subscription/3)
+    end
+
+    field :unregister_push_mutation, :string do
+      arg(:id, non_null(:id))
+      resolve(&PushSubscription.unregister_push_subscription/3)
+    end
+  end
+end