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64 lines
2 KiB
Python
64 lines
2 KiB
Python
import zoneinfo
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from collections import OrderedDict
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from datetime import datetime
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from urllib.parse import unquote
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from fastapi import Request
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import aurweb.config
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def tz_offset(name: str):
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""" Get a timezone offset in the form "+00:00" by its name.
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Example: tz_offset('America/Los_Angeles')
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:param name: Timezone name
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:return: UTC offset in the form "+00:00"
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"""
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dt = datetime.now(tz=zoneinfo.ZoneInfo(name))
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# Our offset in hours.
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offset = dt.utcoffset().total_seconds() / 60 / 60
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# Prefix the offset string with a - or +.
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offset_string = '-' if offset < 0 else '+'
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# Remove any negativity from the offset. We want a good offset. :)
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offset = abs(offset)
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# Truncate the floating point digits, giving the hours.
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hours = int(offset)
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# Subtract hours from the offset, and multiply the remaining fraction
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# (0 - 0.99[repeated]) with 60 minutes to get the number of minutes
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# remaining in the hour.
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minutes = int((offset - hours) * 60)
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# Pad the hours and minutes by two places.
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offset_string += "{:0>2}:{:0>2}".format(hours, minutes)
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return offset_string
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SUPPORTED_TIMEZONES = OrderedDict({
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# Flatten out the list of tuples into an OrderedDict.
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timezone: offset for timezone, offset in sorted([
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# Comprehend a list of tuples (timezone, offset display string)
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# and sort them by (offset, timezone).
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(tz, "(UTC%s) %s" % (tz_offset(tz), tz))
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for tz in zoneinfo.available_timezones()
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], key=lambda element: (tz_offset(element[0]), element[0]))
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})
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def get_request_timezone(request: Request):
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""" Get a request's timezone by its AURTZ cookie. We use the
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configuration's [options] default_timezone otherwise.
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@param request FastAPI request
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"""
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default_tz = aurweb.config.get("options", "default_timezone")
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if request.user.is_authenticated():
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default_tz = request.user.Timezone
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return unquote(request.cookies.get("AURTZ", default_tz))
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