From 73153cffed6ffcd58a381ce5361100bf1f0ab6a0 Mon Sep 17 00:00:00 2001
From: Fraenkiman <frank.pcn@gmail.com>
Date: Tue, 18 Apr 2023 23:27:40 +0200
Subject: [PATCH] The setup, blog and admin area is automatically determined by
 the user agent

Fixes #216
Fixes #197

The exchange between browser and server transmits information about the client and its capabilities in headers - user agent, what it accepts, and (what interests us) language. The browser sends the language information in a header.
These values indicate that the browser accepts, for example, US English (en-us) or German (de-de).
We make use of this. The setup of FlatPress now starts automatically in the language of the user. The determined language will also be used as default language for the FlatPressblog and the administration area until the user defines a language himself.

For the setup the language files 'el-gr','es-es','fr-fr' are still missing.
Therefore I limited the automatic determination of the language to 'cs-cz', 'de-de', 'en-us', 'it-it', 'ja-jp', 'nl-nl', 'pt-br'. See #239
---
 defaults.php                      |  3 +-
 fp-defaults/settings-defaults.php |  6 ++-
 fp-interface/lang/browserlang.php | 64 +++++++++++++++++++++++++++++++
 setup/main.php                    | 61 -----------------------------
 4 files changed, 70 insertions(+), 64 deletions(-)
 create mode 100644 fp-interface/lang/browserlang.php

diff --git a/defaults.php b/defaults.php
index 439c190..cf91023 100755
--- a/defaults.php
+++ b/defaults.php
@@ -93,7 +93,8 @@ define('IMAGES_DIR', FP_CONTENT . 'images/');
 // here is where all the attachments will be saved
 define('ATTACHS_DIR', FP_CONTENT . 'attachs/');
 
-define('LANG_DEFAULT', 'en-us');
+include(LANG_DIR . 'browserlang.php');
+define('LANG_DEFAULT', $browserLang);
 define('BPT_SORT', SORT_DESC);
 
 set_include_path(ABS_PATH);
diff --git a/fp-defaults/settings-defaults.php b/fp-defaults/settings-defaults.php
index f8f2ac9..22cd99a 100755
--- a/fp-defaults/settings-defaults.php
+++ b/fp-defaults/settings-defaults.php
@@ -21,7 +21,7 @@ $fp_config = array(
 		'dateformat' => '%A, %B %e, %Y',
 		'dateformatshort' => '%Y-%m-%d',
 		'charset' => 'utf-8',
-		'lang' => 'en-us'
+		'lang' => ''
 	),
 	'plugins' => array(
 		'blockparser' => array(
@@ -37,4 +37,6 @@ $fp_config = array(
 			'url-maxlen' => 40,
 		),
 	),
-);
\ No newline at end of file
+);
+
+?>
diff --git a/fp-interface/lang/browserlang.php b/fp-interface/lang/browserlang.php
new file mode 100644
index 0000000..7305a60
--- /dev/null
+++ b/fp-interface/lang/browserlang.php
@@ -0,0 +1,64 @@
+<?php
+/**
+ * Get the language code from the browser
+ *
+ * @param array Allowed Languages "array('cs-cz','de-de','en-us','it-it','ja-jp','nl-nl','pt-br')"
+ * @param string Default language
+ * @param string Language string from HTTP-Header
+ * @param bool Strict-Mode
+ * @return array|int Data as array or null
+ */
+error_reporting(0);
+function getBrowserLanguage($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 $strCurrentLanguage;
+}
+
+// accept the following languages, otherwise fall back to "en-us"
+$browserLang = getBrowserLanguage(array('cs-cz', 'de-de', 'en-us', 'it-it', 'ja-jp', 'nl-nl', 'pt-br'), 'en-us');
+
+?>
diff --git a/setup/main.php b/setup/main.php
index 38187d7..e796cb2 100644
--- a/setup/main.php
+++ b/setup/main.php
@@ -1,65 +1,4 @@
 <?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 $strCurrentLanguage;
-}
-
-// accept the following languages, otherwise fall back to "en-us"
-$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";