[LIB_REFACTOR] Moving files into separate semantic categories

lib/exceptions/unknownextensionmimeexception.php

@@ -0,0 +1,26 @@
+<?php
+if (!defined('GNUSOCIAL')) { exit(1); }
+
+/**
+ * Class for unknown extension MIME type exception
+ *
+ * Thrown when we don't know the MIME type for a given file extension.
+ *
+ * @category Exception
+ * @package  GNUsocial
+ * @author   Mikael Nordfeldth <mmn@hethane.se>
+ * @license  https://www.gnu.org/licenses/agpl-3.0.html
+ * @link     https://gnu.io/social
+ */
+
+class UnknownExtensionMimeException extends ServerException
+{
+    public function __construct($ext)
+    {
+        // TRANS: We accept the file type (we probably just accept all files)
+        // TRANS: but don't know the file extension for it. %1$s is the extension.
+        $msg = sprintf(_('Unknown MIME type for file extension: %1$s'), _ve($ext));
+
+        parent::__construct($msg);
+    }
+}