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Use calendar.timegm instead of time.mktime for UTC timestamps #565

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Use calendar.timegm instead of time.mktime for UTC timestamps #565

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3 changes: 2 additions & 1 deletion src/check_jsonschema/cachedownloader.py
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Original file line number Diff line number Diff line change
@@ -1,5 +1,6 @@
from __future__ import annotations

import calendar
import contextlib
import hashlib
import io
Expand Down Expand Up @@ -43,7 +44,7 @@ def _resolve_cache_dir(dirname: str) -> str | None:

def _lastmod_from_response(response: requests.Response) -> float:
try:
return time.mktime(
return calendar.timegm(
time.strptime(response.headers["last-modified"], _LASTMOD_FMT)
)
# OverflowError: time outside of platform-specific bounds
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4 changes: 2 additions & 2 deletions tests/unit/test_cachedownloader.py
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Original file line number Diff line number Diff line change
Expand Up @@ -274,10 +274,10 @@ def test_cachedownloader_handles_bad_lastmod_header(
elif failure_mode == "time_overflow":
add_default_response()

def fake_mktime(*args):
def fake_timegm(*args):
raise OverflowError("uh-oh")

monkeypatch.setattr("time.mktime", fake_mktime)
monkeypatch.setattr("calendar.timegm", fake_timegm)
else:
raise NotImplementedError

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