Use URL_HOST if provided

apps/fz_http/lib/fz_http_web/live/device_live/show.html.heex

@@ -133,14 +133,14 @@
                   <div class="level-left">
                     <code id="shareable-link">
                       <%= if @device.config_token do %>
-                        <%= Routes.device_url(@socket, :config, @device.config_token) %>
+                        <%= shareable_link(@socket, @device) %>
                       <% end %>
                     </code>
                   </div>
                   <div class="level-right">
                     <%= if @device.config_token do %>
                       <button id="copy-shareable-link-button"
-                              data-clipboard={Routes.device_url(@socket, :config, @device.config_token)}
+                              data-clipboard={shareable_link(@socket, @device)}
                               data-target="shareable-link"
                               class="button"
                               data-tooltip="Click to copy"

apps/fz_http/lib/fz_http_web/live_helpers.ex

@@ -7,6 +7,7 @@ defmodule FzHttpWeb.LiveHelpers do
   import Phoenix.LiveView
   import Phoenix.LiveView.Helpers
   alias FzHttp.Users
+  alias FzHttpWeb.Router.Helpers, as: Routes
 
   import FzHttpWeb.ControllerHelpers, only: [root_path_for_role: 1]
 
@@ -63,6 +64,17 @@ defmodule FzHttpWeb.LiveHelpers do
     end
   end
 
+  @doc """
+  URL_HOST is used in releases to set an externally-accessible url. Use that if exists.
+  """
+  def shareable_link(socket, device) do
+    if url_host = Application.get_env(:fz_http, :url_host) do
+      "https://" <> url_host <> Routes.device_path(socket, :config, device.config_token)
+    else
+      Routes.device_url(socket, :config, device.config_token)
+    end
+  end
+
   defp status_digit(response_code) when is_integer(response_code) do
     [status_digit | _tail] = Integer.digits(response_code)
     status_digit

config/releases.exs

@@ -92,6 +92,7 @@ config :fz_vpn,
   cli: FzVpn.CLI.Live
 
 config :fz_http,
+  url_host: url_host,
   connectivity_checks_enabled: connectivity_checks_enabled,
   connectivity_checks_interval: connectivity_checks_interval,
   admin_email: admin_email,