shift73k/lib/shift73k_web/plugs/ensure_allow_registration_plug.ex

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defmodule Shift73kWeb.EnsureAllowRegistrationPlug do
@moduledoc """
This plug ensures that there is at least one known User.
"""
import Plug.Conn
import Phoenix.Controller
import Shift73k, only: [get_app_allow_reg: 0]
alias Shift73k.Repo
alias Shift73k.Accounts.User
@doc false
@spec init(any()) :: any()
def init(config), do: config
@doc false
@spec call(Conn.t(), atom() | [atom()]) :: Conn.t()
def call(conn, _opts) do
# If there aren't even any users, or registration is allowed
if !Repo.exists?(User) || get_app_allow_reg() do
# We will allow registration
conn
else
# Otherwise,
# if app is configured to not allow registration,
# and there is a user,
# then we redirect to root URL
conn
|> redirect(to: "/")
|> halt()
end
end
end