1 files changed, 33 insertions, 0 deletions
diff --git a/src/application/mystic/forum/utils/FileUtils.php b/src/application/mystic/forum/utils/FileUtils.php
new file mode 100644
index 0000000..1910f0c
--- /dev/null
+++ b/src/application/mystic/forum/utils/FileUtils.php
@@ -0,0 +1,33 @@
+<?php
+declare(strict_types=1);
+
+namespace mystic\forum\utils;
+
+final class FileUtils {
+    use StaticClass;
+
+    private const MIME_FILE = __DIR__ . "/../../../assets/mimetypes";
+    public const DEFAULT_MIME_TYPE = "application/octet-stream";
+
+    private static ?array $extToMime = null;
+
+    private static function ensureMimeMapping(): void {
+        if (self::$extToMime !== null)
+            return;
+
+        self::$extToMime = [];
+        
+        $hFile = fopen(self::MIME_FILE, "r");
+        while (($ln = fgets($hFile)) !== false) {
+            [$mime, $extensions] = preg_split('/\t+/', $ln, 2);
+            $extensions = explode(" ", strtolower($extensions));
+            foreach ($extensions as $ext)
+                self::$extToMime[$ext] = $mime;
+        }
+    }
+
+    public static function getMimeTypeForExtension(string $extension, string $defaultMimeType = self::DEFAULT_MIME_TYPE): string {
+        self::ensureMimeMapping();
+        return self::$extToMime[strtolower($extension)] ?? $defaultMimeType;
+    }
+}