Email admins when a new unapproved account is up for review

lib/pleroma/emails/admin_email.ex

@@ -82,4 +82,18 @@ defmodule Pleroma.Emails.AdminEmail do
     |> subject("#{instance_name()} Report")
     |> html_body(html_body)
   end
+
+  def new_unapproved_registration(to, account) do
+    html_body = """
+    <p>New account for review: <a href="#{user_url(account)}">@#{account.nickname}</a></p>
+    <blockquote>#{account.registration_reason}</blockquote>
+    <a href="#{Pleroma.Web.base_url()}/pleroma/admin">Visit AdminFE</a>
+    """
+
+    new()
+    |> to({to.name, to.email})
+    |> from({instance_name(), instance_notify_email()})
+    |> subject("New account up for review on #{instance_name()} (@#{account.nickname})")
+    |> html_body(html_body)
+  end
 end

lib/pleroma/web/twitter_api/twitter_api.ex

@@ -45,6 +45,7 @@ defmodule Pleroma.Web.TwitterAPI.TwitterAPI do
 
     case User.register(changeset) do
       {:ok, user} ->
+        maybe_notify_admins(user)
         {:ok, user}
 
       {:error, changeset} ->
@@ -57,6 +58,18 @@ defmodule Pleroma.Web.TwitterAPI.TwitterAPI do
     end
   end
 
+  defp maybe_notify_admins(%User{} = account) do
+    if Pleroma.Config.get([:instance, :account_approval_required]) do
+      User.all_superusers()
+      |> Enum.filter(fn user -> not is_nil(user.email) end)
+      |> Enum.each(fn superuser ->
+        superuser
+        |> Pleroma.Emails.AdminEmail.new_unapproved_registration(account)
+        |> Pleroma.Emails.Mailer.deliver_async()
+      end)
+    end
+  end
+
   def password_reset(nickname_or_email) do
     with true <- is_binary(nickname_or_email),
          %User{local: true, email: email} = user when is_binary(email) <-