Expolibre-3-www/lib/i18n.php

<?php
$current_dir= basename (getcwd ());

/*
 * Language registration
 */

$registered_languages= array();

function register_lang ( $code, $lang ) {
  global $registered_languages;
  $registered_languages[$code]= $lang;
}

if ($current_dir == "expolibre.org")
  include ("languages.php");
else
  include ("../languages.php");

/*
 * Prefered language detection
 */

function prefered_language () {
  global $registered_languages;
  $locale= locale_accept_from_http ($_SERVER['HTTP_ACCEPT_LANGUAGE']);
  return locale_lookup (array_keys ($registered_languages), $locale, true, 'fr');
}

/*
 * URL translation
 */

function url_translate ($url, $to) {
  global $registered_languages;

  $current_dir= basename (getcwd ());
  if ($current_dir == "expolibre.org")
    $from= 'fr';
  else
    $from= $current_dir;
  
  $name= basename ($url);
  $index= array_search ($name, $registered_languages[$from]['pages']);
  if ($index === false)
    return $registered_languages[$to]['loc'];
  return $registered_languages[$to]['loc'] . $registered_languages[$to]['pages'][$index];
}


/*
 * Redirect to prefered language, if needed, when referer is none or ourself
 */
$server_names= array('expolibre.org', 'www.expolibre.org', 'libreexpo.org', 'www.libreexpo.org');
if (!isset ($_SERVER['HTTP_REFERER']) or (
	strrpos ($_SERVER['HTTP_REFERER'], 'expolibre.org') === false and
        strrpos ($_SERVER['HTTP_REFERER'], 'libreexpo.org') === false)) {

  # if we are deep in the tree we don't upgrade language: it may be choosen
  if ($current_dir == "expolibre.org") {
    $current_dir= $registered_languages['fr']['loc'];
    $prefered_dir= $registered_languages[prefered_language ()]['loc'];
    if (basename($current_dir) != basename ($prefered_dir)) {
      header ("Location: " . url_translate ($_SERVER['REQUEST_URI'], prefered_language ()));
    }
    # if we are not on the good domain
    if ($prefered_dir and false === strpos($prefered_dir, $_SERVER['SERVER_NAME'])) {
      header ("Location: " . url_translate ($_SERVER['REQUEST_URI'], prefered_language ()));
    }
  }
}

?>