Detect and clean ut8 characters

src/Decoder/RequestParamsDecoder.php

@@ -4,14 +4,76 @@
 
 namespace Webgriffe\SyliusNexiPlugin\Decoder;
 
+use const PHP_VERSION_ID;
+use RuntimeException;
+
 final class RequestParamsDecoder implements RequestParamsDecoderInterface
 {
     public function decode(array $requestParams): array
     {
         foreach (array_keys($requestParams) as $key) {
-            $requestParams[$key] = mb_convert_encoding($requestParams[$key], 'UTF-8', 'ISO-8859-1');
+            $requestParams[$key] = self::detectAndCleanUtf8($requestParams[$key]);
         }
 
         return $requestParams;
     }
+
+    /**
+     * @credits to Seldaek/monolog https://github.com/Seldaek/monolog/blob/60ad5183b5e5d6c9d4047e9f3072d36071dcc161/src/Monolog/Utils.php#L146
+     * Detect invalid UTF-8 string characters and convert to valid UTF-8.
+     *
+     * Valid UTF-8 input will be left unmodified, but strings containing
+     * invalid UTF-8 codepoints will be reencoded as UTF-8 with an assumed
+     * original encoding of ISO-8859-1. This conversion may result in
+     * incorrect output if the actual encoding was not ISO-8859-1, but it
+     * will be clean UTF-8 output and will not rely on expensive and fragile
+     * detection algorithms.
+     *
+     * Function converts the input in place in the passed variable so that it
+     * can be used as a callback for array_walk_recursive.
+     *
+     * @param string $data Input to check and convert if needed, passed by ref
+     */
+    private static function detectAndCleanUtf8(string $data): string
+    {
+        if (preg_match('//u', $data) !== 1) {
+            $data = preg_replace_callback(
+                '/[\x80-\xFF]+/',
+                /** @param string[] $m */
+                static function (array $m): string {
+                    return utf8_encode($m[0]);
+                },
+                $data
+            );
+            if (!is_string($data)) {
+                $pcreErrorCode = preg_last_error();
+
+                throw new RuntimeException('Failed to preg_replace_callback: ' . $pcreErrorCode . ' / ' . self::pcreLastErrorMessage($pcreErrorCode));
+            }
+            $data = str_replace(
+                ['¤', '¦', '¨', '´', '¸', '¼', '½', '¾'],
+                ['€', 'Š', 'š', 'Ž', 'ž', 'Œ', 'œ', 'Ÿ'],
+                $data
+            );
+        }
+
+        return $data;
+    }
+
+    public static function pcreLastErrorMessage(int $code): string
+    {
+        if (PHP_VERSION_ID >= 80000) {
+            return preg_last_error_msg();
+        }
+
+        /** @var array<string, int> $constants */
+        $constants = (get_defined_constants(true))['pcre'];
+        $constants = array_filter($constants, static function (string $key): bool {
+            return str_ends_with($key, '_ERROR');
+        }, \ARRAY_FILTER_USE_KEY);
+
+        $constants = array_flip($constants);
+
+        return $constants[$code] ?? 'UNDEFINED_ERROR';
+    }
 }