99 lines
3.1 KiB
Python
99 lines
3.1 KiB
Python
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from __future__ import annotations
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try:
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import winreg
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except ImportError:
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winreg = None
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import datetime
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from typing import Any, Dict, cast
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from babel.core import get_global
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from babel.localtime._helpers import _get_tzinfo_or_raise
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# When building the cldr data on windows this module gets imported.
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# Because at that point there is no global.dat yet this call will
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# fail. We want to catch it down in that case then and just assume
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# the mapping was empty.
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try:
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tz_names: dict[str, str] = cast(Dict[str, str], get_global('windows_zone_mapping'))
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except RuntimeError:
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tz_names = {}
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def valuestodict(key) -> dict[str, Any]:
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"""Convert a registry key's values to a dictionary."""
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dict = {}
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size = winreg.QueryInfoKey(key)[1]
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for i in range(size):
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data = winreg.EnumValue(key, i)
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dict[data[0]] = data[1]
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return dict
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def get_localzone_name() -> str:
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# Windows is special. It has unique time zone names (in several
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# meanings of the word) available, but unfortunately, they can be
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# translated to the language of the operating system, so we need to
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# do a backwards lookup, by going through all time zones and see which
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# one matches.
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handle = winreg.ConnectRegistry(None, winreg.HKEY_LOCAL_MACHINE)
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TZLOCALKEYNAME = r'SYSTEM\CurrentControlSet\Control\TimeZoneInformation'
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localtz = winreg.OpenKey(handle, TZLOCALKEYNAME)
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keyvalues = valuestodict(localtz)
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localtz.Close()
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if 'TimeZoneKeyName' in keyvalues:
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# Windows 7 (and Vista?)
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# For some reason this returns a string with loads of NUL bytes at
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# least on some systems. I don't know if this is a bug somewhere, I
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# just work around it.
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tzkeyname = keyvalues['TimeZoneKeyName'].split('\x00', 1)[0]
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else:
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# Windows 2000 or XP
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# This is the localized name:
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tzwin = keyvalues['StandardName']
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# Open the list of timezones to look up the real name:
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TZKEYNAME = r'SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones'
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tzkey = winreg.OpenKey(handle, TZKEYNAME)
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# Now, match this value to Time Zone information
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tzkeyname = None
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for i in range(winreg.QueryInfoKey(tzkey)[0]):
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subkey = winreg.EnumKey(tzkey, i)
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sub = winreg.OpenKey(tzkey, subkey)
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data = valuestodict(sub)
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sub.Close()
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if data.get('Std', None) == tzwin:
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tzkeyname = subkey
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break
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tzkey.Close()
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handle.Close()
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if tzkeyname is None:
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raise LookupError('Can not find Windows timezone configuration')
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timezone = tz_names.get(tzkeyname)
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if timezone is None:
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# Nope, that didn't work. Try adding 'Standard Time',
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# it seems to work a lot of times:
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timezone = tz_names.get(f"{tzkeyname} Standard Time")
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# Return what we have.
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if timezone is None:
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raise LookupError(f"Can not find timezone {tzkeyname}")
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return timezone
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def _get_localzone() -> datetime.tzinfo:
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if winreg is None:
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raise LookupError(
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'Runtime support not available')
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return _get_tzinfo_or_raise(get_localzone_name())
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