From 2849e973118a5e9677a306c002543dfd8622f98c Mon Sep 17 00:00:00 2001
From: Fraenkiman <frank.pcn@gmail.com>
Date: Sun, 29 Jan 2023 02:06:29 +0100
Subject: [PATCH] Setup should use the user's browser language.

This closes issue #197

Please check if it works with php8.1. Tested with php 7.4

Update main.php

'el-gr','es-es','fr-fr' removed as browser language, because the FlatPress setup currently has no language files for it

Update lang.de-de.php

Update main.php

some code formatting
---
 setup/lang/lang.de-de.php |  2 +-
 setup/main.php            | 70 +++++++++++++++++++++++++++++++++++----
 2 files changed, 65 insertions(+), 7 deletions(-)

diff --git a/setup/lang/lang.de-de.php b/setup/lang/lang.de-de.php
index ddde6df..73aaeaf 100644
--- a/setup/lang/lang.de-de.php
+++ b/setup/lang/lang.de-de.php
@@ -63,7 +63,7 @@ $lang ['step3'] = array(
 );
 
 $lang ['buttonbar'] = array(
-	'next' => 'Next >'
+	'next' => 'Weiter >'
 );
 
 $lang ['samplecontent'] = array();
diff --git a/setup/main.php b/setup/main.php
index 37cc5b8..38187d7 100644
--- a/setup/main.php
+++ b/setup/main.php
@@ -1,6 +1,66 @@
-<?php 
+<?php
+/**
+ * Get the language code from the browser
+ *
+ * @param array Allowed Languages "array('cs-cz','de-de','en-us','it-it','ja-jp','nl-nl','pt-br')"
+ * @param string Default language
+ * @param string Language string from HTTP-Header
+ * @param bool Strict-Mode
+ * @return array|int Data as array or null
+ */
+function getBrowserLanguage($arrAllowedLanguages, $strDefaultLanguage, $strLangVariable = null, $boolStrictMode = true) {
+	if (isset($_REQUEST ['language'])) {
+		if (strlen($_REQUEST ['language']) == 2) {
+			return strtolower($_REQUEST ['language']);
+		}
+		foreach ($arrAllowedLanguages as $strValue) {
+			if (preg_match('/^' . $strValue . '\-/i', $_REQUEST ['language'])) {
+				return strtolower($strValue);
+			}
+		}
+	}
+	if (!is_array($arrAllowedLanguages)) {
+		if (strpos($arrAllowedLanguages,';')) {
+			$array = explode(';', $arrAllowedLanguages);
+			$arrAllowedLanguages = $array;
+		}
+	}
+	if (!isset($_SERVER ['HTTP_ACCEPT_LANGUAGE'])) {
+		return $arrAllowedLanguages [0];
+	}
+	if ($strLangVariable === null) $strLangVariable = $_SERVER ['HTTP_ACCEPT_LANGUAGE'];
+	if (empty($strLangVariable)) return $strDefaultLanguage;
+	$arrAcceptedLanguages = preg_split('/,\s*/', $strLangVariable);
+	$strCurrentLanguage = $strDefaultLanguage;
+	$intCurrentQ = 0;
+	foreach ($arrAcceptedLanguages as $arrAcceptedLanguage) {
+		$boolResult = preg_match ('/^([a-z]{1,8}(?:-[a-z]{1,8})*)' . '(?:;\s*q=(0(?:\.[0-9]{1,3})?|1(?:\.0{1,3})?))?$/i', $arrAcceptedLanguage, $arrMatches);
+		if (!$boolResult) continue;
+		$arrLangCode = explode ('-', $arrMatches [1]);
+		if (isset($arrMatches [2]))
+			$intLangQuality = (float)$arrMatches [2];
+		else
+			$intLangQuality = 1.0;
+		while (count ($arrLangCode)) {
+			if (!is_array($arrAllowedLanguages)) $arrAllowedLanguages = array($arrAllowedLanguages);
+			if (in_array (strtolower (join ('-', $arrLangCode)), $arrAllowedLanguages)) {
+				if ($intLangQuality > $intCurrentQ) {
+					$strCurrentLanguage = strtolower (join ('-', $arrLangCode));
+					$intCurrentQ = $intLangQuality;
+					break;
+				}
+			}
+			if ($boolStrictMode) break;
+			array_pop ($arrLangCode);
+		}
+	}
+	return $strCurrentLanguage;
+}
 
-$language = @$_POST['language']? $_POST['language'] :'en-us';
+// accept the following languages, otherwise fall back to "en-us"
+$browserLang = getBrowserLanguage(array('cs-cz', 'de-de', 'en-us', 'it-it', 'ja-jp', 'nl-nl', 'pt-br'), 'en-us');
+
+$language = @$_POST ['language']? $_POST ['language'] : $browserLang;
 
 $lf = "lang.$language.php";
 if (!preg_match('|^lang\.[a-z]{2}-[a-z]{2}\.php$|', $lf))
@@ -13,12 +73,10 @@ $step = null;
 
 $id = getstep($step);
 
-$l =& $lang[$step];
-
+$l =& $lang [$step];
 
 include("./setup/tpls/header.tpl.php");
 include("./setup/tpls/{$step}.tpl.php");
 include("./setup/tpls/footer.tpl.php");
 
-
-?>
\ No newline at end of file
+?>