Fixing handling of absolute paths in S3 source

harvester/source/s3.py

 import logging
 
-from typing import TYPE_CHECKING, IO, AnyStr, List
+from typing import TYPE_CHECKING, IO, AnyStr, List, Tuple
 from functools import cached_property
 from urllib.parse import urlparse
 
@@ -58,14 +58,19 @@ class S3Source(Source):
         )
         return client
 
-    def get_bucket_and_key(self, path):
+    def get_bucket_and_key(self, path: str) -> Tuple[str, str]:
         parsed = urlparse(path)
         if parsed.scheme and parsed.scheme.lower() != "s3":
             raise ValueError(f"Invalid S3 URL {path}")
 
         if parsed.netloc:
-            return (parsed.netloc, parsed.path)
+            path = parsed.path
+            if path.startswith("/"):
+                path = path[1:]
+            return (parsed.netloc, path)
 
+        if path.startswith("/"):
+            path = path[1:]
         return (self.bucket, path)
 
     def listdir(self, path) -> List[str]: