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backend/venv/lib/python3.9/site-packages/minio/credentials/credentials.py

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+# -*- coding: utf-8 -*-
+# MinIO Python Library for Amazon S3 Compatible Cloud Storage,
+# (C) 2020 MinIO, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Credential definitions to access S3 service."""
+from __future__ import annotations
+
+from dataclasses import dataclass
+from datetime import datetime, timedelta, timezone
+from typing import Optional
+
+
+@dataclass(frozen=True)
+class Credentials:
+    """
+    Represents credentials access key, secret key and session token.
+    """
+
+    access_key: str
+    secret_key: str
+    session_token: Optional[str] = None
+    expiration: Optional[datetime] = None
+
+    def __post_init__(self):
+        if not self.access_key:
+            raise ValueError("Access key must not be empty")
+
+        if not self.secret_key:
+            raise ValueError("Secret key must not be empty")
+
+        if self.expiration and self.expiration.tzinfo:
+            object.__setattr__(
+                self, "expiration",
+                self.expiration.astimezone(timezone.utc).replace(tzinfo=None),
+            )
+
+    def is_expired(self) -> bool:
+        """Check whether this credentials expired or not."""
+        return (
+            self.expiration < (datetime.utcnow() + timedelta(seconds=10))
+            if self.expiration else False
+        )