From c66fa99f7090a662991117b222d529c509974366 Mon Sep 17 00:00:00 2001
From: jonathan343 <jonathangee09@gmail.com>
Date: Mon, 28 Oct 2024 07:34:47 -0400
Subject: [PATCH] Revert "Ignore x-amz-checksum-algorithm when checking for
 user supplied checksums."

This reverts commit 93a47ebafb9e71474c358cf1ffd78e5b8cfb9e08.
---
 botocore/utils.py               |  2 +-
 tests/unit/test_httpchecksum.py | 22 ----------------------
 2 files changed, 1 insertion(+), 23 deletions(-)

diff --git a/botocore/utils.py b/botocore/utils.py
index dd2369e788..a531972d63 100644
--- a/botocore/utils.py
+++ b/botocore/utils.py
@@ -185,7 +185,7 @@
 
 # This pattern can be used to detect if a header is a flexible checksum header
 CHECKSUM_HEADER_PATTERN = re.compile(
-    r'^x-amz-checksum-(?!algorithm\b)([a-z0-9]*)$',
+    r'^X-Amz-Checksum-([a-z0-9]*)$',
     flags=re.IGNORECASE,
 )
 
diff --git a/tests/unit/test_httpchecksum.py b/tests/unit/test_httpchecksum.py
index d02aa23971..84f1d07998 100644
--- a/tests/unit/test_httpchecksum.py
+++ b/tests/unit/test_httpchecksum.py
@@ -259,28 +259,6 @@ def test_request_checksum_algorithm_model_new_crc32(self):
         }
         self.assertEqual(actual_algorithm, expected_algorithm)
 
-    def test_x_amz_checksum_algorithm_header_is_ignored(self):
-        request = self._build_request(b"")
-        request["headers"]["x-amz-checksum-algorithm"] = "some_value"
-        operation_model = self._make_operation_model(
-            http_checksum={"requestAlgorithmMember": "Algorithm"}
-        )
-        params = {}
-
-        resolve_request_checksum_algorithm(request, operation_model, params)
-        self.assertIn("checksum", request["context"])
-
-    def test_non_x_amz_checksum_algorithm_header_is_not_ignored(self):
-        request = self._build_request(b"")
-        request["headers"]["x-amz-checksum-someChecksum"] = "some_value"
-        operation_model = self._make_operation_model(
-            http_checksum={"requestAlgorithmMember": "Algorithm"}
-        )
-        params = {}
-
-        resolve_request_checksum_algorithm(request, operation_model, params)
-        self.assertNotIn("checksum", request["context"])
-
     def test_apply_request_checksum_handles_no_checksum_context(self):
         request = self._build_request(b"")
         apply_request_checksum(request)