fix for file.list api pagination

mdrsclient/utils.py

@@ -1,5 +1,6 @@
 import os
 from typing import IO, Any
+from urllib.parse import parse_qs, urlparse
 
 if os.name == "nt":
     import msvcrt
@@ -21,3 +22,10 @@ class FileLock:
             msvcrt.locking(file.fileno(), msvcrt.LK_UNLCK, 1)
         elif os.name == "posix":
             fcntl.flock(file.fileno(), fcntl.LOCK_UN)
+
+
+def page_num_from_url(url: str) -> int | None:
+    parsed_url = urlparse(url)
+    params = parse_qs(parsed_url.query)
+    page = params.get("page", [None])[0]
+    return int(page) if page is not None else None