Add debug logging for sanitization

Author: aivus

lib/utils/index.js

@@ -7,6 +7,7 @@ import typeByExt from '../config/resource-type-by-ext.js';
 
 import logger from '../logger.js';
 
+
 const MAX_FILENAME_LENGTH = 230;
 const IS_URL = /^((http[s]?:)?\/\/)/;
 
@@ -99,7 +100,11 @@ function getFilenameExtension (filepath) {
 }
 
 function sanitizeFilename (filename) {
-	return filenamifySanitizeFilename(filename, {replacement: '_', maxLength: MAX_FILENAME_LENGTH});
+	const sanitized = filenamifySanitizeFilename(filename, {replacement: '_', maxLength: MAX_FILENAME_LENGTH});
+	if (sanitized !== filename) {
+		logger.debug(`[utils] sanitize filename: ${filename} -> ${sanitized}`);
+	}
+	return sanitized;
 }
 
 function normalizeUrl (u, opts) {