fix typing in helpers.py (#1373)

Signed-off-by: Bala.FA <[email protected]>

minio/helpers.py

@@ -26,11 +26,12 @@
 import platform
 import re
 import urllib.parse
-from abc import ABCMeta
+from datetime import datetime
 from queue import Queue
 from threading import BoundedSemaphore, Thread
-from typing import BinaryIO
+from typing import BinaryIO, Mapping
 
+from typing_extensions import Protocol
 from urllib3._collections import HTTPHeaderDict
 
 from . import __title__, __version__
@@ -108,30 +109,21 @@ def queryencode(
 
 
 def headers_to_strings(
-        headers: dict[str, str],
+        headers: Mapping[str, str | list[str] | tuple[str]],
         titled_key: bool = False,
 ) -> str:
     """Convert HTTP headers to multi-line string."""
-    def _get_key(key: str) -> str:
-        return key.title() if titled_key else key
-
-    def _get_value(value: str) -> str:
-        return re.sub(
-            r"Credential=([^/]+)",
-            "Credential=*REDACTED*",
-            re.sub(
-                r"Signature=([0-9a-f]+)",
-                "Signature=*REDACTED*",
-                value if isinstance(value, str) else str(value),
-            ),
-        ) if titled_key else value
-
-    return "\n".join(
-        [
-            f"{_get_key(key)}: {_get_value(value)}"
-            for key, value in headers.items()
-        ]
-    )
+    values = []
+    for key, value in headers.items():
+        key = key.title() if titled_key else key
+        for item in value if isinstance(value, (list, tuple)) else [value]:
+            item = re.sub(
+                r"Credential=([^/]+)",
+                "Credential=*REDACTED*",
+                re.sub(r"Signature=([0-9a-f]+)", "Signature=*REDACTED*", item),
+            ) if titled_key else item
+            values.append(f"{key}: {item}")
+    return "\n".join(values)
 
 
 def _validate_sizes(object_size: int, part_size: int):
@@ -186,22 +178,21 @@ def get_part_info(object_size: int, part_size: int) -> tuple[int, int]:
     return part_size, part_count
 
 
-class Progress:
-    """Progress base class for put object API."""
-    __metaclass__ = ABCMeta
+class ProgressType(Protocol):
+    """typing stub for Put/Get object progress."""
 
-    def set_meta(self, total_length: int, object_name: str):
-        """Set object information to progress."""
+    def set_meta(self, object_name: str, total_length: int):
+        """Set process meta information."""
 
-    def update(self, size: int):
-        """Update current progress size."""
+    def update(self, length: int):
+        """Set current progress length."""
 
 
 def read_part_data(
         stream: BinaryIO,
         size: int,
         part_data: bytes = b"",
-        progress: Progress | None = None,
+        progress: ProgressType | None = None,
 ) -> bytes:
     """Read part data of given size from stream."""
     size -= len(part_data)
@@ -290,13 +281,13 @@ def is_valid_policy_type(policy: str | bytes):
     return True
 
 
-def check_ssec(sse: SseCustomerKey):
+def check_ssec(sse: SseCustomerKey | None):
     """Check sse is SseCustomerKey type or not."""
     if sse and not isinstance(sse, SseCustomerKey):
         raise ValueError("SseCustomerKey type is required")
 
 
-def check_sse(sse: Sse):
+def check_sse(sse: Sse | None):
     """Check sse is Sse type or not."""
     if sse and not isinstance(sse, Sse):
         raise ValueError("Sse type is required")
@@ -345,7 +336,7 @@ def url_replace(
 
 
 def _metadata_to_headers(
-        metadata: dict[str, str | list | tuple],
+        metadata: dict[str, str | list[str] | tuple[str]],
 ) -> dict[str, list[str]]:
     """Convert user metadata to headers."""
     def normalize_key(key: str) -> str:
@@ -364,7 +355,7 @@ def to_string(value) -> str:
             ) from exc
         return value
 
-    def normalize_value(values: str | list | tuple) -> list[str]:
+    def normalize_value(values: str | list[str] | tuple[str]) -> list[str]:
         if not isinstance(values, (list, tuple)):
             values = [values]
         return [to_string(value) for value in values]
@@ -376,8 +367,8 @@ def normalize_value(values: str | list | tuple) -> list[str]:
 
 
 def normalize_headers(
-        headers: dict[str, str | list | tuple],
-) -> dict[str, str | list | tuple]:
+        headers: dict[str, str | list[str] | tuple[str]] | None,
+) -> dict[str, str | list[str] | tuple[str]]:
     """Normalize headers by prefixing 'X-Amz-Meta-' for user metadata."""
     headers = {str(key): value for key, value in (headers or {}).items()}
 
@@ -407,12 +398,12 @@ def guess_user_metadata(key: str) -> bool:
 
 
 def genheaders(
-        headers: dict[str, str | list | tuple],
+        headers: dict[str, str | list[str] | tuple[str]] | None,
         sse: Sse | None,
         tags: dict[str, str] | None,
         retention,
         legal_hold: bool,
-) -> dict[str, str | list | tuple]:
+) -> dict[str, str | list[str] | tuple[str]]:
     """Generate headers for given parameters."""
     headers = normalize_headers(headers)
     headers.update(sse.headers() if sse else {})
@@ -648,7 +639,7 @@ def _build_aws_url(
 
         netloc = s3_prefix
         if "s3-accelerate" in s3_prefix:
-            if "." in bucket_name:
+            if "." in (bucket_name or ""):
                 raise ValueError(
                     f"bucket name '{bucket_name}' with '.' is not allowed "
                     f"for accelerate endpoint"
@@ -755,7 +746,7 @@ def __init__(
             version_id: str | None,
             etag: str | None,
             http_headers: HTTPHeaderDict,
-            last_modified: str | None = None,
+            last_modified: datetime | None = None,
             location: str | None = None,
     ):
         self._bucket_name = bucket_name
@@ -792,7 +783,7 @@ def http_headers(self) -> HTTPHeaderDict:
         return self._http_headers
 
     @property
-    def last_modified(self) -> str | None:
+    def last_modified(self) -> datetime | None:
         """Get last-modified time."""
         return self._last_modified