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46 lines
1.6 KiB
46 lines
1.6 KiB
"""Convert times to and from HTTP-date serialisations.
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Reference: https://www.rfc-editor.org/rfc/rfc7231#section-7.1.1.1
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"""
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import time
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import warnings
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from email.utils import parsedate_tz
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from sphinx.deprecation import RemovedInSphinx90Warning
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_WEEKDAY_NAME = ('Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun')
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_MONTH_NAME = ('', # Placeholder for indexing purposes
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'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun',
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'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec')
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_GMT_OFFSET = float(time.localtime().tm_gmtoff)
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def epoch_to_rfc1123(epoch: float) -> str:
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"""Return HTTP-date string from epoch offset."""
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yr, mn, dd, hh, mm, ss, wd, _yd, _tz = time.gmtime(epoch)
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weekday_name = _WEEKDAY_NAME[wd]
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month = _MONTH_NAME[mn]
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return f'{weekday_name}, {dd:02} {month} {yr:04} {hh:02}:{mm:02}:{ss:02} GMT'
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def rfc1123_to_epoch(rfc1123: str) -> float:
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"""Return epoch offset from HTTP-date string."""
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t = parsedate_tz(rfc1123)
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if t is None:
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raise ValueError
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if not rfc1123.endswith(" GMT"):
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warnings.warn(
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"HTTP-date string does not meet RFC 7231 requirements "
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f"(must end with 'GMT'): {rfc1123!r}",
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RemovedInSphinx90Warning, stacklevel=3,
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)
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epoch_secs = time.mktime(time.struct_time(t[:9])) + _GMT_OFFSET
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if (gmt_offset := t[9]) != 0:
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warnings.warn(
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"HTTP-date string does not meet RFC 7231 requirements "
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f"(must be GMT time): {rfc1123!r}",
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RemovedInSphinx90Warning, stacklevel=3,
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)
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return epoch_secs - (gmt_offset or 0)
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return epoch_secs
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