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fix(storage-blob): normalize backslash to forward slash in SAS canonical resource #48849

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fix(storage-blob): normalize backslash to forward slash in SAS canonical resource #48849

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267cba6
fix(storage-blob): normalize backslash to forward slash in SAS canoni…
dajiaohuang Sep 2, 2026
d42de0c
test: cover SAS backslash normalization
dajiaohuang Sep 4, 2026
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4 changes: 4 additions & 0 deletions sdk/storage/azure-storage-blob/azure/storage/blob/_shared_access_signature.py
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Original file line number Diff line number Diff line change
Expand Up @@ -351,6 +351,10 @@ def add_resource_signature(
if path[0] != "/":
path = "/" + path

# Normalize backslashes to forward slashes to match Azure Storage service behavior
# Go and .NET SDKs already perform this normalization
path = path.replace("\\", "/")

canonicalized_resource = "/blob/" + account_name + path + "\n"

# Form the string to sign from shared_access_policy and canonicalized
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19 changes: 19 additions & 0 deletions sdk/storage/azure-storage-blob/tests/test_shared_access_signature.py
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Original file line number Diff line number Diff line change
@@ -0,0 +1,19 @@
from datetime import datetime, timedelta

from azure.storage.blob import BlobSasPermissions, generate_blob_sas


def test_generate_blob_sas_normalizes_backslashes_in_canonical_resource():
string_to_sign = []

generate_blob_sas(
account_name="account",
container_name="container",
blob_name="dir\\file",
account_key="a2V5",
permission=BlobSasPermissions(read=True),
expiry=datetime.utcnow() + timedelta(hours=1),
sts_hook=string_to_sign.append,
)

assert "/blob/account/container/dir/file\n" in string_to_sign[0]