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"""Convert times to and from HTTP-date serialisations.
Reference: https://www.rfc-editor.org/rfc/rfc7231#section-7.1.1.1
"""
import time
import warnings
from email.utils import formatdate, parsedate_tz
from sphinx.deprecation import RemovedInSphinx90Warning
_GMT_OFFSET = float(time.localtime().tm_gmtoff)
def epoch_to_rfc1123(epoch: float) -> str:
"""Return HTTP-date string from epoch offset."""
return formatdate(epoch, usegmt=True)
def rfc1123_to_epoch(rfc1123: str) -> float:
"""Return epoch offset from HTTP-date string."""
t = parsedate_tz(rfc1123)
if t is None:
raise ValueError
if not rfc1123.endswith(" GMT"):
warnings.warn(
"HTTP-date string does not meet RFC 7231 requirements "
f"(must end with 'GMT'): {rfc1123!r}",
RemovedInSphinx90Warning, stacklevel=3,
)
epoch_secs = time.mktime(time.struct_time(t[:9])) + _GMT_OFFSET
if (gmt_offset := t[9]) != 0:
warnings.warn(
"HTTP-date string does not meet RFC 7231 requirements "
f"(must be GMT time): {rfc1123!r}",
RemovedInSphinx90Warning, stacklevel=3,
)
return epoch_secs - (gmt_offset or 0)
return epoch_secs
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