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fix: Improve type annotations in SignatureVerifier #1845

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fix: Improve type annotations in SignatureVerifier #1845

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8067096
fix: Improve type annotations in `SignatureVerifier`
BHSPitMonkey Mar 24, 2026
bdb6cac
Keep runtime fallback for 3.7/3.8 compat
BHSPitMonkey Mar 24, 2026
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18 changes: 12 additions & 6 deletions slack_sdk/signature/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3,7 +3,13 @@
import hashlib
import hmac
from time import time
from typing import Dict, Optional, Union
from typing import Dict, Optional, Union, TYPE_CHECKING

# Fallback to Dict for Python 3.7/3.8 compatibility (safe to remove once these versions are no longer supported)
if TYPE_CHECKING:
from collections.abc import Mapping
else:
Mapping = Dict


class Clock:
Expand All @@ -26,23 +32,23 @@ def __init__(self, signing_secret: str, clock: Clock = Clock()):
def is_valid_request(
self,
body: Union[str, bytes],
headers: Dict[str, str],
headers: Mapping[str, str],
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@WilliamBergamin WilliamBergamin Mar 24, 2026

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For python 3.7 and 3.8 this Mapping type is not importable from collections.abc causing

slack_sdk/signature/__init__.py:30: in SignatureVerifier
    headers: Mapping[str, str],
E   TypeError: 'ABCMeta' object is not subscriptable

Importing Mapping as follows should fix the issue 🤔

from typing import TYPE_CHECKING,  Dict, Optional, Union

if TYPE_CHECKING:
    from collections.abc import Mapping
else:
    Mapping = Dict

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@WilliamBergamin WilliamBergamin Mar 24, 2026

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If we go this route, it might be a good idea to also include a comment about how this is for python 3.7 and 3.8 backwards compatibility

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@BHSPitMonkey BHSPitMonkey Mar 24, 2026

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Argh, old Pythons strike again! But I like your proposed solution - Will push it with a comment shortly.

) -> bool:
"""Verifies if the given signature is valid"""
if headers is None:
return False
normalized_headers = {k.lower(): v for k, v in headers.items()}
return self.is_valid(
body=body,
timestamp=normalized_headers.get("x-slack-request-timestamp", None), # type: ignore[arg-type]
signature=normalized_headers.get("x-slack-signature", None), # type: ignore[arg-type]
timestamp=normalized_headers.get("x-slack-request-timestamp", None),
signature=normalized_headers.get("x-slack-signature", None),
)

def is_valid(
self,
body: Union[str, bytes],
timestamp: str,
signature: str,
timestamp: Optional[str],
signature: Optional[str],
) -> bool:
"""Verifies if the given signature is valid"""
if timestamp is None or signature is None:
Expand Down