Check for mbstring extension on alternative encodings

Author: endroid

src/Encoding/Encoding.php

@@ -6,92 +6,17 @@
 
 final class Encoding implements EncodingInterface
 {
-    private const ENCODINGS = [
-        'BASE64',
-        'UUENCODE',
-        'HTML-ENTITIES',
-        'Quoted-Printable',
-        '7bit',
-        '8bit',
-        'UCS-4',
-        'UCS-4BE',
-        'UCS-4LE',
-        'UCS-2',
-        'UCS-2BE',
-        'UCS-2LE',
-        'UTF-32',
-        'UTF-32BE',
-        'UTF-32LE',
-        'UTF-16',
-        'UTF-16BE',
-        'UTF-16LE',
-        'UTF-8',
-        'UTF-7',
-        'UTF7-IMAP',
-        'ASCII',
-        'EUC-JP',
-        'SJIS',
-        'eucJP-win',
-        'EUC-JP-2004',
-        'SJIS-Mobile#DOCOMO',
-        'SJIS-Mobile#KDDI',
-        'SJIS-Mobile#SOFTBANK',
-        'SJIS-mac',
-        'SJIS-2004',
-        'UTF-8-Mobile#DOCOMO',
-        'UTF-8-Mobile#KDDI-A',
-        'UTF-8-Mobile#KDDI-B',
-        'UTF-8-Mobile#SOFTBANK',
-        'CP932',
-        'SJIS-win',
-        'CP51932',
-        'JIS',
-        'ISO-2022-JP',
-        'ISO-2022-JP-MS',
-        'GB18030',
-        'Windows-1252',
-        'Windows-1254',
-        'ISO-8859-1',
-        'ISO-8859-2',
-        'ISO-8859-3',
-        'ISO-8859-4',
-        'ISO-8859-5',
-        'ISO-8859-6',
-        'ISO-8859-7',
-        'ISO-8859-8',
-        'ISO-8859-9',
-        'ISO-8859-10',
-        'ISO-8859-13',
-        'ISO-8859-14',
-        'ISO-8859-15',
-        'ISO-8859-16',
-        'EUC-CN',
-        'CP936',
-        'HZ',
-        'EUC-TW',
-        'BIG-5',
-        'CP950',
-        'EUC-KR',
-        'UHC',
-        'ISO-2022-KR',
-        'Windows-1251',
-        'CP866',
-        'KOI8-R',
-        'KOI8-U',
-        'ArmSCII-8',
-        'CP850',
-        'ISO-2022-JP-2004',
-        'ISO-2022-JP-MOBILE#KDDI',
-        'CP50220',
-        'CP50221',
-        'CP50222',
-    ];
-
     public function __construct(
         private readonly string $value
     ) {
-        if (!in_array($value, self::ENCODINGS)) {
-            throw new \Exception(sprintf('Invalid encoding "%s": choose one of '.implode(', ', self::ENCODINGS), $value));
+        if ('UTF-8' !== $value) {
+            if (!function_exists('mb_list_encodings')) {
+                throw new \Exception('Unable to validate encoding: make sure the mbstring extension is installed and enabled');
+            }
+
+            if (!in_array($value, mb_list_encodings())) {
+                throw new \Exception(sprintf('Invalid encoding "%s": choose one of '.implode(', ', mb_list_encodings()), $value));
+            }
         }
     }