Phoenix hosts management

host.ex

defmodule AppWeb.Host do
  @moduledoc """
  Conveniences for working with host.
  """
  def root do
    Keyword.get(get_config(), :root)
  end

  def root_uri do
    Keyword.get(get_config(), :root_uri)
  end

  def admin do
    Keyword.get(get_config(), :admin)
  end

  def admin_uri do
    Keyword.get(get_config(), :admin)
  end

  defp get_config do
    Application.get_env(:your_app, __MODULE__)
  end
end

# This is the config for production
config :your_app, AppWeb.Host,
  root: "yourdomain.co",
  root_uri: %URI{host: "yourdomain.co", scheme: "https", port: 443},
  admin: "admin.yourdomain.co",
  admin_uri: %URI{host: "admin.yourdomain.co", scheme: "https", port: 443}

# This is the config for dev or test
# Adapt dependending on your setup
config :your_app, AppWeb.Host,
  root: nil,
  root_uri: %URI{host: nil, scheme: "http", port: 4000},
  admin: nil,
  admin_uri: %URI{host: nil, scheme: "http", port: 4000}

# In the router.ex
  alias AppWeb.Host

  scope "/", BabelBookWeb, host: Host.root() do
    ...
    get "/users/register", UserRegistrationController, :new
    ...
  end

  scope "/", BabelBookWeb, host: Host.admin() do
    ...
    get "/", ConsoleController, :index
    ...
  end

# Generate link for routes in root and admin admin with production config
Router.user_registration_url(AppWeb.Host.root_uri(), :new) -> https://yourdomain.co/users/register
Router.console_url(AppWeb.Host.admin_uri(), :index) -> https://admin.yourdomain.co/

# Generate link for routes in root and admin admin with dev / test config
Router.user_registration_url(AppWeb.Host.root_uri(), :new) -> http://localhost:4000/users/register
Router.console_url(AppWeb.Host.admin_uri(), :index) -> http://localhost:4000/