JFIF$        dd7 

Viewing File: /usr/lib/python3.9/site-packages/dns/_features.py

# Copyright (C) Dnspython Contributors, see LICENSE for text of ISC license

import importlib.metadata
import itertools
import string
from typing import Dict, List, Tuple


def _tuple_from_text(version: str) -> Tuple:
    text_parts = version.split(".")
    int_parts = []
    for text_part in text_parts:
        digit_prefix = "".join(
            itertools.takewhile(lambda x: x in string.digits, text_part)
        )
        try:
            int_parts.append(int(digit_prefix))
        except Exception:
            break
    return tuple(int_parts)


def _version_check(
    requirement: str,
) -> bool:
    """Is the requirement fulfilled?

    The requirement must be of the form

        package>=version
    """
    package, minimum = requirement.split(">=")
    try:
        version = importlib.metadata.version(package)
    except Exception:
        return False
    t_version = _tuple_from_text(version)
    t_minimum = _tuple_from_text(minimum)
    if t_version < t_minimum:
        return False
    return True


_cache: Dict[str, bool] = {}


def have(feature: str) -> bool:
    """Is *feature* available?

    This tests if all optional packages needed for the
    feature are available and recent enough.

    Returns ``True`` if the feature is available,
    and ``False`` if it is not or if metadata is
    missing.
    """
    value = _cache.get(feature)
    if value is not None:
        return value
    requirements = _requirements.get(feature)
    if requirements is None:
        # we make a cache entry here for consistency not performance
        _cache[feature] = False
        return False
    ok = True
    for requirement in requirements:
        if not _version_check(requirement):
            ok = False
            break
    _cache[feature] = ok
    return ok


def force(feature: str, enabled: bool) -> None:
    """Force the status of *feature* to be *enabled*.

    This method is provided as a workaround for any cases
    where importlib.metadata is ineffective, or for testing.
    """
    _cache[feature] = enabled


_requirements: Dict[str, List[str]] = {
    ### BEGIN generated requirements
    "dnssec": ["cryptography>=41"],
    "doh": ["httpcore>=1.0.0", "httpx>=0.26.0", "h2>=4.1.0"],
    "doq": ["aioquic>=0.9.25"],
    "idna": ["idna>=3.6"],
    "trio": ["trio>=0.23"],
    "wmi": ["wmi>=1.5.1"],
    ### END generated requirements
}
Back to Directory  nL+D550H?Mx ,D"v]qv;6*Zqn)ZP0!1 A "#a$2Qr D8 a Ri[f\mIykIw0cuFcRı?lO7к_f˓[C$殷WF<_W ԣsKcëIzyQy/_LKℂ;C",pFA:/]=H  ~,ls/9ć:[=/#f;)x{ٛEQ )~ =𘙲r*2~ a _V=' kumFD}KYYC)({ *g&f`툪ry`=^cJ.I](*`wq1dđ#̩͑0;H]u搂@:~וKL Nsh}OIR*8:2 !lDJVo(3=M(zȰ+i*NAr6KnSl)!JJӁ* %݉?|D}d5:eP0R;{$X'xF@.ÊB {,WJuQɲRI;9QE琯62fT.DUJ;*cP A\ILNj!J۱+O\͔]ޒS߼Jȧc%ANolՎprULZԛerE2=XDXgVQeӓk yP7U*omQIs,K`)6\G3t?pgjrmۛجwluGtfh9uyP0D;Uڽ"OXlif$)&|ML0Zrm1[HXPlPR0'G=i2N+0e2]]9VTPO׮7h(F*癈'=QVZDF,d߬~TX G[`le69CR(!S2!P <0x<!1AQ "Raq02Br#SCTb ?Ζ"]mH5WR7k.ۛ!}Q~+yԏz|@T20S~Kek *zFf^2X*(@8r?CIuI|֓>^ExLgNUY+{.RѪ τV׸YTD I62'8Y27'\TP.6d&˦@Vqi|8-OΕ]ʔ U=TL8=;6c| !qfF3aů&~$l}'NWUs$Uk^SV:U# 6w++s&r+nڐ{@29 gL u"TÙM=6(^"7r}=6YݾlCuhquympǦ GjhsǜNlɻ}o7#S6aw4!OSrD57%|?x>L |/nD6?/8w#[)L7+6〼T ATg!%5MmZ/c-{1_Je"|^$'O&ޱմTrb$w)R$& N1EtdU3Uȉ1pM"N*(DNyd96.(jQ)X 5cQɎMyW?Q*!R>6=7)Xj5`J]e8%t!+'!1Q5 !1 AQaqё#2"0BRb?Gt^## .llQT $v,,m㵜5ubV =sY+@d{N! dnO<.-B;_wJt6;QJd.Qc%p{ 1,sNDdFHI0ГoXшe黅XۢF:)[FGXƹ/w_cMeD,ʡcc.WDtA$j@:) -# u c1<@ۗ9F)KJ-hpP]_x[qBlbpʖw q"LFGdƶ*s+ډ_Zc"?%t[IP 6J]#=ɺVvvCGsGh1 >)6|ey?Lӣm,4GWUi`]uJVoVDG< SB6ϏQ@ TiUlyOU0kfV~~}SZ@*WUUi##; s/[=!7}"WN]'(L! ~y5g9T̅JkbM' +s:S +B)v@Mj e Cf jE 0Y\QnzG1д~Wo{T9?`Rmyhsy3!HAD]mc1~2LSu7xT;j$`}4->L#vzŏILS ֭T{rjGKC;bpU=-`BsK.SFw4Mq]ZdHS0)tLg