Add webpush front-end support

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

lib/mobilizon/users/push_subscription.ex

@@ -3,45 +3,29 @@ defmodule Mobilizon.Users.PushSubscription do
   alias Mobilizon.Users.User
   import Ecto.Changeset
 
+  @primary_key {:id, :binary_id, autogenerate: true}
   schema "user_push_subscriptions" do
     field(:digest, :string)
     belongs_to(:user, User)
-
-    embeds_one :data, Data, on_replace: :delete do
-      field(:endpoint, :string)
-
-      embeds_one :keys, Keys, on_replace: :delete do
-        field(:auth, :string)
-        field(:p256dh, :string)
-      end
-    end
-
+    field(:endpoint, :string)
+    field(:auth, :string)
+    field(:p256dh, :string)
     timestamps()
   end
 
   @doc false
   def changeset(push_subscription, attrs) do
     push_subscription
-    |> cast(attrs, [:user_id])
-    |> cast_embed(:data, with: &cast_data/2)
-    |> put_change(:digest, compute_digest(attrs.data))
-    |> validate_required([:digest, :user_id, :data])
+    |> cast(attrs, [:user_id, :endpoint, :auth, :p256dh])
+    |> put_change(:digest, compute_digest(attrs))
+    |> validate_required([:digest, :user_id, :endpoint, :auth, :p256dh])
+    |> unique_constraint([:digest, :user_id], name: :user_push_subscriptions_user_id_digest_index)
   end
 
-  defp cast_data(schema, attrs) do
-    schema
-    |> cast(attrs, [:endpoint])
-    |> cast_embed(:keys, with: &cast_keys/2)
-    |> validate_required([:endpoint, :keys])
-  end
+  defp compute_digest(attrs) do
+    data =
+      Jason.encode!(%{endpoint: attrs.endpoint, keys: %{auth: attrs.auth, p256dh: attrs.p256dh}})
 
-  defp cast_keys(schema, attrs) do
-    schema
-    |> cast(attrs, [:auth, :p256dh])
-    |> validate_required([:auth, :p256dh])
-  end
-
-  defp compute_digest(data) do
     :sha256
     |> :crypto.hash(data)
     |> Base.encode16()