Add registration emails on OAuth signup

This is a copy and only manually tested… ugh

registrations/config/config.exs

@@ -46,6 +46,9 @@ config :registrations, :pow,
   messages_backend: RegistrationsWeb.Pow.Messages,
   users_context: RegistrationsWeb.Pow.Users
 
+config :registrations, :pow_assent,
+  user_identities_context: RegistrationsWeb.PowAssent.UserIdentities
+
 # Configure phoenix generators
 config :phoenix, :generators,
   migration: true,

registrations/lib/registrations_web/pow_assent/user_identities.ex

@@ -0,0 +1,32 @@
+defmodule RegistrationsWeb.PowAssent.UserIdentities do
+  use PowAssent.Ecto.UserIdentities.Context,
+    repo: Registrations.Repo,
+    user: RegistrationsWeb.User
+
+    import Ecto.Query, only: [from: 2]
+
+    def create_user(user_identity_params, user_params, user_id_params) do
+      case pow_assent_create_user(user_identity_params, user_params, user_id_params) do
+        {:ok, user} ->
+          messages =
+            Registrations.Repo.all(
+              from(m in RegistrationsWeb.Message,
+                where: m.ready == true,
+                select: m,
+                order_by: :postmarked_at
+              )
+            )
+
+          unless Enum.empty?(messages) do
+            Registrations.Mailer.send_backlog(messages, user)
+          end
+
+          Registrations.Mailer.send_welcome_email(user.email)
+          Registrations.Mailer.send_registration(user)
+          {:ok, user}
+
+          {:error, changeset} ->
+            {:error, changeset}
+      end
+    end
+end