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Better language detection from HTTP header

This commit is contained in:
Wruczek 2023-03-31 04:52:28 +02:00
parent cd9433cc5c
commit 31fa1bb65a
1 changed files with 23 additions and 7 deletions
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28
src/private/php/Utils/Language/LanguageUtils.php
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@ -103,16 +103,32 @@ class LanguageUtils {
* @return Language|null user language if determined, null otherwise
*/
public function detectUserLanguage(): ?Language {
if (isset($_COOKIE["tswebsite_language"])) { // check cookie
$langcode = $_COOKIE["tswebsite_language"];
} else if (isset($_SERVER["HTTP_ACCEPT_LANGUAGE"])) { // check http headers
$langcode = substr($_SERVER["HTTP_ACCEPT_LANGUAGE"], 0, 2);
// check cookie
if (isset($_COOKIE["tswebsite_language"])) {
$lang = $this->getLanguageByCode($_COOKIE["tswebsite_language"]);
if ($lang !== null) {
return $lang;
}
}
// if language with that code exists, return it
if(!empty($langcode) && ($lang = $this->getLanguageByCode($langcode))) {
// check Accept-Language HTTP header
if (isset($_SERVER["HTTP_ACCEPT_LANGUAGE"])) {
$langs = explode(",", $_SERVER["HTTP_ACCEPT_LANGUAGE"]);
// find and return first language that our website supports
// TODO would be best to sort the list by their weights, but modern
// browsers seem to send the list that is already sorted
foreach ($langs as $lang) {
// IE adds an extra space - trim to remove it
$langcode = trim(explode(";", $lang)[0]);
$lang = $this->getLanguageByCode($langcode);
if ($lang !== null) {
return $lang;
}
}
}
return null;
}