Add new users digest email

lib/pleroma/emails/new_users_digest_email.ex

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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Emails.NewUsersDigestEmail do
+  use Phoenix.Swoosh, view: Pleroma.Web.EmailView, layout: {Pleroma.Web.LayoutView, :email_styled}
+
+  defp instance_notify_email do
+    Pleroma.Config.get([:instance, :notify_email]) || Pleroma.Config.get([:instance, :email])
+  end
+
+  def new_users(to, users_and_statuses) do
+    instance_name = Pleroma.Config.get([:instance, :name])
+    styling = Pleroma.Config.get([Pleroma.Emails.UserEmail, :styling])
+    logo = Pleroma.Config.get([Pleroma.Emails.UserEmail, :logo])
+
+    logo_path =
+      if is_nil(logo) do
+        Path.join(:code.priv_dir(:pleroma), "static/static/logo.png")
+      else
+        Path.join(Pleroma.Config.get([:instance, :static_dir]), logo)
+      end
+
+    new()
+    |> to({to.name, to.email})
+    |> from({instance_name, instance_notify_email()})
+    |> subject("#{instance_name} New Users")
+    |> render_body("new_users_digest.html", %{
+      title: "New Users",
+      users_and_statuses: users_and_statuses,
+      instance: instance_name,
+      styling: styling
+    })
+    |> attachment(Swoosh.Attachment.new(logo_path, filename: "logo.png", type: :inline))
+  end
+end