Allow custom rules in attachments_mimes setting

Author: xaviqv

src/Traits/Attachments.php

@@ -267,8 +267,11 @@ protected function saveAttachments($info)
             }
             $attachment->original_filename = $original_filename;
 
+            // Mimes validation rule
+            $file_rules = (preg_match('/:/', Setting::grab('attachments_mimes')) ? '' : 'mimes:') . Setting::grab('attachments_mimes');
+
             // Mimetype
-            $validator = Validator::make(['file' => $uploadedFile], ['file' => 'mimes:'.Setting::grab('attachments_mimes')]);
+            $validator = Validator::make(['file' => $uploadedFile], ['file' => $file_rules]);
 
             if ($validator->fails()) {
                 $a_errors[$attachment_block_name.($block + $index)] = trans('panichd::lang.attachment-update-not-valid-mime', ['file' => $original_filename]);