--- a/lib/python3.8/site-packages/setuptools/package_index.py	Mon Jul 27 03:47:31 2020 -0400
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,1140 +0,0 @@
-"""PyPI and direct package downloading"""
-import sys
-import os
-import re
-import shutil
-import socket
-import base64
-import hashlib
-import itertools
-import warnings
-from functools import wraps
-
-from setuptools.extern import six
-from setuptools.extern.six.moves import urllib, http_client, configparser, map
-
-import setuptools
-from pkg_resources import (
-    CHECKOUT_DIST, Distribution, BINARY_DIST, normalize_path, SOURCE_DIST,
-    Environment, find_distributions, safe_name, safe_version,
-    to_filename, Requirement, DEVELOP_DIST, EGG_DIST,
-)
-from setuptools import ssl_support
-from distutils import log
-from distutils.errors import DistutilsError
-from fnmatch import translate
-from setuptools.py27compat import get_all_headers
-from setuptools.py33compat import unescape
-from setuptools.wheel import Wheel
-
-__metaclass__ = type
-
-EGG_FRAGMENT = re.compile(r'^egg=([-A-Za-z0-9_.+!]+)$')
-HREF = re.compile(r"""href\s*=\s*['"]?([^'"> ]+)""", re.I)
-PYPI_MD5 = re.compile(
-    r'<a href="([^"#]+)">([^<]+)</a>\n\s+\(<a (?:title="MD5 hash"\n\s+)'
-    r'href="[^?]+\?:action=show_md5&amp;digest=([0-9a-f]{32})">md5</a>\)'
-)
-URL_SCHEME = re.compile('([-+.a-z0-9]{2,}):', re.I).match
-EXTENSIONS = ".tar.gz .tar.bz2 .tar .zip .tgz".split()
-
-__all__ = [
-    'PackageIndex', 'distros_for_url', 'parse_bdist_wininst',
-    'interpret_distro_name',
-]
-
-_SOCKET_TIMEOUT = 15
-
-_tmpl = "setuptools/{setuptools.__version__} Python-urllib/{py_major}"
-user_agent = _tmpl.format(
-    py_major='{}.{}'.format(*sys.version_info), setuptools=setuptools)
-
-
-def parse_requirement_arg(spec):
-    try:
-        return Requirement.parse(spec)
-    except ValueError:
-        raise DistutilsError(
-            "Not a URL, existing file, or requirement spec: %r" % (spec,)
-        )
-
-
-def parse_bdist_wininst(name):
-    """Return (base,pyversion) or (None,None) for possible .exe name"""
-
-    lower = name.lower()
-    base, py_ver, plat = None, None, None
-
-    if lower.endswith('.exe'):
-        if lower.endswith('.win32.exe'):
-            base = name[:-10]
-            plat = 'win32'
-        elif lower.startswith('.win32-py', -16):
-            py_ver = name[-7:-4]
-            base = name[:-16]
-            plat = 'win32'
-        elif lower.endswith('.win-amd64.exe'):
-            base = name[:-14]
-            plat = 'win-amd64'
-        elif lower.startswith('.win-amd64-py', -20):
-            py_ver = name[-7:-4]
-            base = name[:-20]
-            plat = 'win-amd64'
-    return base, py_ver, plat
-
-
-def egg_info_for_url(url):
-    parts = urllib.parse.urlparse(url)
-    scheme, server, path, parameters, query, fragment = parts
-    base = urllib.parse.unquote(path.split('/')[-1])
-    if server == 'sourceforge.net' and base == 'download':  # XXX Yuck
-        base = urllib.parse.unquote(path.split('/')[-2])
-    if '#' in base:
-        base, fragment = base.split('#', 1)
-    return base, fragment
-
-
-def distros_for_url(url, metadata=None):
-    """Yield egg or source distribution objects that might be found at a URL"""
-    base, fragment = egg_info_for_url(url)
-    for dist in distros_for_location(url, base, metadata):
-        yield dist
-    if fragment:
-        match = EGG_FRAGMENT.match(fragment)
-        if match:
-            for dist in interpret_distro_name(
-                url, match.group(1), metadata, precedence=CHECKOUT_DIST
-            ):
-                yield dist
-
-
-def distros_for_location(location, basename, metadata=None):
-    """Yield egg or source distribution objects based on basename"""
-    if basename.endswith('.egg.zip'):
-        basename = basename[:-4]  # strip the .zip
-    if basename.endswith('.egg') and '-' in basename:
-        # only one, unambiguous interpretation
-        return [Distribution.from_location(location, basename, metadata)]
-    if basename.endswith('.whl') and '-' in basename:
-        wheel = Wheel(basename)
-        if not wheel.is_compatible():
-            return []
-        return [Distribution(
-            location=location,
-            project_name=wheel.project_name,
-            version=wheel.version,
-            # Increase priority over eggs.
-            precedence=EGG_DIST + 1,
-        )]
-    if basename.endswith('.exe'):
-        win_base, py_ver, platform = parse_bdist_wininst(basename)
-        if win_base is not None:
-            return interpret_distro_name(
-                location, win_base, metadata, py_ver, BINARY_DIST, platform
-            )
-    # Try source distro extensions (.zip, .tgz, etc.)
-    #
-    for ext in EXTENSIONS:
-        if basename.endswith(ext):
-            basename = basename[:-len(ext)]
-            return interpret_distro_name(location, basename, metadata)
-    return []  # no extension matched
-
-
-def distros_for_filename(filename, metadata=None):
-    """Yield possible egg or source distribution objects based on a filename"""
-    return distros_for_location(
-        normalize_path(filename), os.path.basename(filename), metadata
-    )
-
-
-def interpret_distro_name(
-        location, basename, metadata, py_version=None, precedence=SOURCE_DIST,
-        platform=None
-):
-    """Generate alternative interpretations of a source distro name
-
-    Note: if `location` is a filesystem filename, you should call
-    ``pkg_resources.normalize_path()`` on it before passing it to this
-    routine!
-    """
-    # Generate alternative interpretations of a source distro name
-    # Because some packages are ambiguous as to name/versions split
-    # e.g. "adns-python-1.1.0", "egenix-mx-commercial", etc.
-    # So, we generate each possible interepretation (e.g. "adns, python-1.1.0"
-    # "adns-python, 1.1.0", and "adns-python-1.1.0, no version").  In practice,
-    # the spurious interpretations should be ignored, because in the event
-    # there's also an "adns" package, the spurious "python-1.1.0" version will
-    # compare lower than any numeric version number, and is therefore unlikely
-    # to match a request for it.  It's still a potential problem, though, and
-    # in the long run PyPI and the distutils should go for "safe" names and
-    # versions in distribution archive names (sdist and bdist).
-
-    parts = basename.split('-')
-    if not py_version and any(re.match(r'py\d\.\d$', p) for p in parts[2:]):
-        # it is a bdist_dumb, not an sdist -- bail out
-        return
-
-    for p in range(1, len(parts) + 1):
-        yield Distribution(
-            location, metadata, '-'.join(parts[:p]), '-'.join(parts[p:]),
-            py_version=py_version, precedence=precedence,
-            platform=platform
-        )
-
-
-# From Python 2.7 docs
-def unique_everseen(iterable, key=None):
-    "List unique elements, preserving order. Remember all elements ever seen."
-    # unique_everseen('AAAABBBCCDAABBB') --> A B C D
-    # unique_everseen('ABBCcAD', str.lower) --> A B C D
-    seen = set()
-    seen_add = seen.add
-    if key is None:
-        for element in six.moves.filterfalse(seen.__contains__, iterable):
-            seen_add(element)
-            yield element
-    else:
-        for element in iterable:
-            k = key(element)
-            if k not in seen:
-                seen_add(k)
-                yield element
-
-
-def unique_values(func):
-    """
-    Wrap a function returning an iterable such that the resulting iterable
-    only ever yields unique items.
-    """
-
-    @wraps(func)
-    def wrapper(*args, **kwargs):
-        return unique_everseen(func(*args, **kwargs))
-
-    return wrapper
-
-
-REL = re.compile(r"""<([^>]*\srel\s*=\s*['"]?([^'">]+)[^>]*)>""", re.I)
-# this line is here to fix emacs' cruddy broken syntax highlighting
-
-
-@unique_values
-def find_external_links(url, page):
-    """Find rel="homepage" and rel="download" links in `page`, yielding URLs"""
-
-    for match in REL.finditer(page):
-        tag, rel = match.groups()
-        rels = set(map(str.strip, rel.lower().split(',')))
-        if 'homepage' in rels or 'download' in rels:
-            for match in HREF.finditer(tag):
-                yield urllib.parse.urljoin(url, htmldecode(match.group(1)))
-
-    for tag in ("<th>Home Page", "<th>Download URL"):
-        pos = page.find(tag)
-        if pos != -1:
-            match = HREF.search(page, pos)
-            if match:
-                yield urllib.parse.urljoin(url, htmldecode(match.group(1)))
-
-
-class ContentChecker:
-    """
-    A null content checker that defines the interface for checking content
-    """
-
-    def feed(self, block):
-        """
-        Feed a block of data to the hash.
-        """
-        return
-
-    def is_valid(self):
-        """
-        Check the hash. Return False if validation fails.
-        """
-        return True
-
-    def report(self, reporter, template):
-        """
-        Call reporter with information about the checker (hash name)
-        substituted into the template.
-        """
-        return
-
-
-class HashChecker(ContentChecker):
-    pattern = re.compile(
-        r'(?P<hash_name>sha1|sha224|sha384|sha256|sha512|md5)='
-        r'(?P<expected>[a-f0-9]+)'
-    )
-
-    def __init__(self, hash_name, expected):
-        self.hash_name = hash_name
-        self.hash = hashlib.new(hash_name)
-        self.expected = expected
-
-    @classmethod
-    def from_url(cls, url):
-        "Construct a (possibly null) ContentChecker from a URL"
-        fragment = urllib.parse.urlparse(url)[-1]
-        if not fragment:
-            return ContentChecker()
-        match = cls.pattern.search(fragment)
-        if not match:
-            return ContentChecker()
-        return cls(**match.groupdict())
-
-    def feed(self, block):
-        self.hash.update(block)
-
-    def is_valid(self):
-        return self.hash.hexdigest() == self.expected
-
-    def report(self, reporter, template):
-        msg = template % self.hash_name
-        return reporter(msg)
-
-
-class PackageIndex(Environment):
-    """A distribution index that scans web pages for download URLs"""
-
-    def __init__(
-            self, index_url="https://pypi.org/simple/", hosts=('*',),
-            ca_bundle=None, verify_ssl=True, *args, **kw
-    ):
-        Environment.__init__(self, *args, **kw)
-        self.index_url = index_url + "/" [:not index_url.endswith('/')]
-        self.scanned_urls = {}
-        self.fetched_urls = {}
-        self.package_pages = {}
-        self.allows = re.compile('|'.join(map(translate, hosts))).match
-        self.to_scan = []
-        use_ssl = (
-            verify_ssl
-            and ssl_support.is_available
-            and (ca_bundle or ssl_support.find_ca_bundle())
-        )
-        if use_ssl:
-            self.opener = ssl_support.opener_for(ca_bundle)
-        else:
-            self.opener = urllib.request.urlopen
-
-    def process_url(self, url, retrieve=False):
-        """Evaluate a URL as a possible download, and maybe retrieve it"""
-        if url in self.scanned_urls and not retrieve:
-            return
-        self.scanned_urls[url] = True
-        if not URL_SCHEME(url):
-            self.process_filename(url)
-            return
-        else:
-            dists = list(distros_for_url(url))
-            if dists:
-                if not self.url_ok(url):
-                    return
-                self.debug("Found link: %s", url)
-
-        if dists or not retrieve or url in self.fetched_urls:
-            list(map(self.add, dists))
-            return  # don't need the actual page
-
-        if not self.url_ok(url):
-            self.fetched_urls[url] = True
-            return
-
-        self.info("Reading %s", url)
-        self.fetched_urls[url] = True  # prevent multiple fetch attempts
-        tmpl = "Download error on %s: %%s -- Some packages may not be found!"
-        f = self.open_url(url, tmpl % url)
-        if f is None:
-            return
-        if isinstance(f, urllib.error.HTTPError) and f.code == 401:
-            self.info("Authentication error: %s" % f.msg)
-        self.fetched_urls[f.url] = True
-        if 'html' not in f.headers.get('content-type', '').lower():
-            f.close()  # not html, we can't process it
-            return
-
-        base = f.url  # handle redirects
-        page = f.read()
-        if not isinstance(page, str):
-            # In Python 3 and got bytes but want str.
-            if isinstance(f, urllib.error.HTTPError):
-                # Errors have no charset, assume latin1:
-                charset = 'latin-1'
-            else:
-                charset = f.headers.get_param('charset') or 'latin-1'
-            page = page.decode(charset, "ignore")
-        f.close()
-        for match in HREF.finditer(page):
-            link = urllib.parse.urljoin(base, htmldecode(match.group(1)))
-            self.process_url(link)
-        if url.startswith(self.index_url) and getattr(f, 'code', None) != 404:
-            page = self.process_index(url, page)
-
-    def process_filename(self, fn, nested=False):
-        # process filenames or directories
-        if not os.path.exists(fn):
-            self.warn("Not found: %s", fn)
-            return
-
-        if os.path.isdir(fn) and not nested:
-            path = os.path.realpath(fn)
-            for item in os.listdir(path):
-                self.process_filename(os.path.join(path, item), True)
-
-        dists = distros_for_filename(fn)
-        if dists:
-            self.debug("Found: %s", fn)
-            list(map(self.add, dists))
-
-    def url_ok(self, url, fatal=False):
-        s = URL_SCHEME(url)
-        is_file = s and s.group(1).lower() == 'file'
-        if is_file or self.allows(urllib.parse.urlparse(url)[1]):
-            return True
-        msg = (
-            "\nNote: Bypassing %s (disallowed host; see "
-            "http://bit.ly/2hrImnY for details).\n")
-        if fatal:
-            raise DistutilsError(msg % url)
-        else:
-            self.warn(msg, url)
-
-    def scan_egg_links(self, search_path):
-        dirs = filter(os.path.isdir, search_path)
-        egg_links = (
-            (path, entry)
-            for path in dirs
-            for entry in os.listdir(path)
-            if entry.endswith('.egg-link')
-        )
-        list(itertools.starmap(self.scan_egg_link, egg_links))
-
-    def scan_egg_link(self, path, entry):
-        with open(os.path.join(path, entry)) as raw_lines:
-            # filter non-empty lines
-            lines = list(filter(None, map(str.strip, raw_lines)))
-
-        if len(lines) != 2:
-            # format is not recognized; punt
-            return
-
-        egg_path, setup_path = lines
-
-        for dist in find_distributions(os.path.join(path, egg_path)):
-            dist.location = os.path.join(path, *lines)
-            dist.precedence = SOURCE_DIST
-            self.add(dist)
-
-    def process_index(self, url, page):
-        """Process the contents of a PyPI page"""
-
-        def scan(link):
-            # Process a URL to see if it's for a package page
-            if link.startswith(self.index_url):
-                parts = list(map(
-                    urllib.parse.unquote, link[len(self.index_url):].split('/')
-                ))
-                if len(parts) == 2 and '#' not in parts[1]:
-                    # it's a package page, sanitize and index it
-                    pkg = safe_name(parts[0])
-                    ver = safe_version(parts[1])
-                    self.package_pages.setdefault(pkg.lower(), {})[link] = True
-                    return to_filename(pkg), to_filename(ver)
-            return None, None
-
-        # process an index page into the package-page index
-        for match in HREF.finditer(page):
-            try:
-                scan(urllib.parse.urljoin(url, htmldecode(match.group(1))))
-            except ValueError:
-                pass
-
-        pkg, ver = scan(url)  # ensure this page is in the page index
-        if pkg:
-            # process individual package page
-            for new_url in find_external_links(url, page):
-                # Process the found URL
-                base, frag = egg_info_for_url(new_url)
-                if base.endswith('.py') and not frag:
-                    if ver:
-                        new_url += '#egg=%s-%s' % (pkg, ver)
-                    else:
-                        self.need_version_info(url)
-                self.scan_url(new_url)
-
-            return PYPI_MD5.sub(
-                lambda m: '<a href="%s#md5=%s">%s</a>' % m.group(1, 3, 2), page
-            )
-        else:
-            return ""  # no sense double-scanning non-package pages
-
-    def need_version_info(self, url):
-        self.scan_all(
-            "Page at %s links to .py file(s) without version info; an index "
-            "scan is required.", url
-        )
-
-    def scan_all(self, msg=None, *args):
-        if self.index_url not in self.fetched_urls:
-            if msg:
-                self.warn(msg, *args)
-            self.info(
-                "Scanning index of all packages (this may take a while)"
-            )
-        self.scan_url(self.index_url)
-
-    def find_packages(self, requirement):
-        self.scan_url(self.index_url + requirement.unsafe_name + '/')
-
-        if not self.package_pages.get(requirement.key):
-            # Fall back to safe version of the name
-            self.scan_url(self.index_url + requirement.project_name + '/')
-
-        if not self.package_pages.get(requirement.key):
-            # We couldn't find the target package, so search the index page too
-            self.not_found_in_index(requirement)
-
-        for url in list(self.package_pages.get(requirement.key, ())):
-            # scan each page that might be related to the desired package
-            self.scan_url(url)
-
-    def obtain(self, requirement, installer=None):
-        self.prescan()
-        self.find_packages(requirement)
-        for dist in self[requirement.key]:
-            if dist in requirement:
-                return dist
-            self.debug("%s does not match %s", requirement, dist)
-        return super(PackageIndex, self).obtain(requirement, installer)
-
-    def check_hash(self, checker, filename, tfp):
-        """
-        checker is a ContentChecker
-        """
-        checker.report(
-            self.debug,
-            "Validating %%s checksum for %s" % filename)
-        if not checker.is_valid():
-            tfp.close()
-            os.unlink(filename)
-            raise DistutilsError(
-                "%s validation failed for %s; "
-                "possible download problem?"
-                % (checker.hash.name, os.path.basename(filename))
-            )
-
-    def add_find_links(self, urls):
-        """Add `urls` to the list that will be prescanned for searches"""
-        for url in urls:
-            if (
-                self.to_scan is None  # if we have already "gone online"
-                or not URL_SCHEME(url)  # or it's a local file/directory
-                or url.startswith('file:')
-                or list(distros_for_url(url))  # or a direct package link
-            ):
-                # then go ahead and process it now
-                self.scan_url(url)
-            else:
-                # otherwise, defer retrieval till later
-                self.to_scan.append(url)
-
-    def prescan(self):
-        """Scan urls scheduled for prescanning (e.g. --find-links)"""
-        if self.to_scan:
-            list(map(self.scan_url, self.to_scan))
-        self.to_scan = None  # from now on, go ahead and process immediately
-
-    def not_found_in_index(self, requirement):
-        if self[requirement.key]:  # we've seen at least one distro
-            meth, msg = self.info, "Couldn't retrieve index page for %r"
-        else:  # no distros seen for this name, might be misspelled
-            meth, msg = (
-                self.warn,
-                "Couldn't find index page for %r (maybe misspelled?)")
-        meth(msg, requirement.unsafe_name)
-        self.scan_all()
-
-    def download(self, spec, tmpdir):
-        """Locate and/or download `spec` to `tmpdir`, returning a local path
-
-        `spec` may be a ``Requirement`` object, or a string containing a URL,
-        an existing local filename, or a project/version requirement spec
-        (i.e. the string form of a ``Requirement`` object).  If it is the URL
-        of a .py file with an unambiguous ``#egg=name-version`` tag (i.e., one
-        that escapes ``-`` as ``_`` throughout), a trivial ``setup.py`` is
-        automatically created alongside the downloaded file.
-
-        If `spec` is a ``Requirement`` object or a string containing a
-        project/version requirement spec, this method returns the location of
-        a matching distribution (possibly after downloading it to `tmpdir`).
-        If `spec` is a locally existing file or directory name, it is simply
-        returned unchanged.  If `spec` is a URL, it is downloaded to a subpath
-        of `tmpdir`, and the local filename is returned.  Various errors may be
-        raised if a problem occurs during downloading.
-        """
-        if not isinstance(spec, Requirement):
-            scheme = URL_SCHEME(spec)
-            if scheme:
-                # It's a url, download it to tmpdir
-                found = self._download_url(scheme.group(1), spec, tmpdir)
-                base, fragment = egg_info_for_url(spec)
-                if base.endswith('.py'):
-                    found = self.gen_setup(found, fragment, tmpdir)
-                return found
-            elif os.path.exists(spec):
-                # Existing file or directory, just return it
-                return spec
-            else:
-                spec = parse_requirement_arg(spec)
-        return getattr(self.fetch_distribution(spec, tmpdir), 'location', None)
-
-    def fetch_distribution(
-            self, requirement, tmpdir, force_scan=False, source=False,
-            develop_ok=False, local_index=None):
-        """Obtain a distribution suitable for fulfilling `requirement`
-
-        `requirement` must be a ``pkg_resources.Requirement`` instance.
-        If necessary, or if the `force_scan` flag is set, the requirement is
-        searched for in the (online) package index as well as the locally
-        installed packages.  If a distribution matching `requirement` is found,
-        the returned distribution's ``location`` is the value you would have
-        gotten from calling the ``download()`` method with the matching
-        distribution's URL or filename.  If no matching distribution is found,
-        ``None`` is returned.
-
-        If the `source` flag is set, only source distributions and source
-        checkout links will be considered.  Unless the `develop_ok` flag is
-        set, development and system eggs (i.e., those using the ``.egg-info``
-        format) will be ignored.
-        """
-        # process a Requirement
-        self.info("Searching for %s", requirement)
-        skipped = {}
-        dist = None
-
-        def find(req, env=None):
-            if env is None:
-                env = self
-            # Find a matching distribution; may be called more than once
-
-            for dist in env[req.key]:
-
-                if dist.precedence == DEVELOP_DIST and not develop_ok:
-                    if dist not in skipped:
-                        self.warn(
-                            "Skipping development or system egg: %s", dist,
-                        )
-                        skipped[dist] = 1
-                    continue
-
-                test = (
-                    dist in req
-                    and (dist.precedence <= SOURCE_DIST or not source)
-                )
-                if test:
-                    loc = self.download(dist.location, tmpdir)
-                    dist.download_location = loc
-                    if os.path.exists(dist.download_location):
-                        return dist
-
-        if force_scan:
-            self.prescan()
-            self.find_packages(requirement)
-            dist = find(requirement)
-
-        if not dist and local_index is not None:
-            dist = find(requirement, local_index)
-
-        if dist is None:
-            if self.to_scan is not None:
-                self.prescan()
-            dist = find(requirement)
-
-        if dist is None and not force_scan:
-            self.find_packages(requirement)
-            dist = find(requirement)
-
-        if dist is None:
-            self.warn(
-                "No local packages or working download links found for %s%s",
-                (source and "a source distribution of " or ""),
-                requirement,
-            )
-        else:
-            self.info("Best match: %s", dist)
-            return dist.clone(location=dist.download_location)
-
-    def fetch(self, requirement, tmpdir, force_scan=False, source=False):
-        """Obtain a file suitable for fulfilling `requirement`
-
-        DEPRECATED; use the ``fetch_distribution()`` method now instead.  For
-        backward compatibility, this routine is identical but returns the
-        ``location`` of the downloaded distribution instead of a distribution
-        object.
-        """
-        dist = self.fetch_distribution(requirement, tmpdir, force_scan, source)
-        if dist is not None:
-            return dist.location
-        return None
-
-    def gen_setup(self, filename, fragment, tmpdir):
-        match = EGG_FRAGMENT.match(fragment)
-        dists = match and [
-            d for d in
-            interpret_distro_name(filename, match.group(1), None) if d.version
-        ] or []
-
-        if len(dists) == 1:  # unambiguous ``#egg`` fragment
-            basename = os.path.basename(filename)
-
-            # Make sure the file has been downloaded to the temp dir.
-            if os.path.dirname(filename) != tmpdir:
-                dst = os.path.join(tmpdir, basename)
-                from setuptools.command.easy_install import samefile
-                if not samefile(filename, dst):
-                    shutil.copy2(filename, dst)
-                    filename = dst
-
-            with open(os.path.join(tmpdir, 'setup.py'), 'w') as file:
-                file.write(
-                    "from setuptools import setup\n"
-                    "setup(name=%r, version=%r, py_modules=[%r])\n"
-                    % (
-                        dists[0].project_name, dists[0].version,
-                        os.path.splitext(basename)[0]
-                    )
-                )
-            return filename
-
-        elif match:
-            raise DistutilsError(
-                "Can't unambiguously interpret project/version identifier %r; "
-                "any dashes in the name or version should be escaped using "
-                "underscores. %r" % (fragment, dists)
-            )
-        else:
-            raise DistutilsError(
-                "Can't process plain .py files without an '#egg=name-version'"
-                " suffix to enable automatic setup script generation."
-            )
-
-    dl_blocksize = 8192
-
-    def _download_to(self, url, filename):
-        self.info("Downloading %s", url)
-        # Download the file
-        fp = None
-        try:
-            checker = HashChecker.from_url(url)
-            fp = self.open_url(url)
-            if isinstance(fp, urllib.error.HTTPError):
-                raise DistutilsError(
-                    "Can't download %s: %s %s" % (url, fp.code, fp.msg)
-                )
-            headers = fp.info()
-            blocknum = 0
-            bs = self.dl_blocksize
-            size = -1
-            if "content-length" in headers:
-                # Some servers return multiple Content-Length headers :(
-                sizes = get_all_headers(headers, 'Content-Length')
-                size = max(map(int, sizes))
-                self.reporthook(url, filename, blocknum, bs, size)
-            with open(filename, 'wb') as tfp:
-                while True:
-                    block = fp.read(bs)
-                    if block:
-                        checker.feed(block)
-                        tfp.write(block)
-                        blocknum += 1
-                        self.reporthook(url, filename, blocknum, bs, size)
-                    else:
-                        break
-                self.check_hash(checker, filename, tfp)
-            return headers
-        finally:
-            if fp:
-                fp.close()
-
-    def reporthook(self, url, filename, blocknum, blksize, size):
-        pass  # no-op
-
-    def open_url(self, url, warning=None):
-        if url.startswith('file:'):
-            return local_open(url)
-        try:
-            return open_with_auth(url, self.opener)
-        except (ValueError, http_client.InvalidURL) as v:
-            msg = ' '.join([str(arg) for arg in v.args])
-            if warning:
-                self.warn(warning, msg)
-            else:
-                raise DistutilsError('%s %s' % (url, msg))
-        except urllib.error.HTTPError as v:
-            return v
-        except urllib.error.URLError as v:
-            if warning:
-                self.warn(warning, v.reason)
-            else:
-                raise DistutilsError("Download error for %s: %s"
-                                     % (url, v.reason))
-        except http_client.BadStatusLine as v:
-            if warning:
-                self.warn(warning, v.line)
-            else:
-                raise DistutilsError(
-                    '%s returned a bad status line. The server might be '
-                    'down, %s' %
-                    (url, v.line)
-                )
-        except (http_client.HTTPException, socket.error) as v:
-            if warning:
-                self.warn(warning, v)
-            else:
-                raise DistutilsError("Download error for %s: %s"
-                                     % (url, v))
-
-    def _download_url(self, scheme, url, tmpdir):
-        # Determine download filename
-        #
-        name, fragment = egg_info_for_url(url)
-        if name:
-            while '..' in name:
-                name = name.replace('..', '.').replace('\\', '_')
-        else:
-            name = "__downloaded__"  # default if URL has no path contents
-
-        if name.endswith('.egg.zip'):
-            name = name[:-4]  # strip the extra .zip before download
-
-        filename = os.path.join(tmpdir, name)
-
-        # Download the file
-        #
-        if scheme == 'svn' or scheme.startswith('svn+'):
-            return self._download_svn(url, filename)
-        elif scheme == 'git' or scheme.startswith('git+'):
-            return self._download_git(url, filename)
-        elif scheme.startswith('hg+'):
-            return self._download_hg(url, filename)
-        elif scheme == 'file':
-            return urllib.request.url2pathname(urllib.parse.urlparse(url)[2])
-        else:
-            self.url_ok(url, True)  # raises error if not allowed
-            return self._attempt_download(url, filename)
-
-    def scan_url(self, url):
-        self.process_url(url, True)
-
-    def _attempt_download(self, url, filename):
-        headers = self._download_to(url, filename)
-        if 'html' in headers.get('content-type', '').lower():
-            return self._download_html(url, headers, filename)
-        else:
-            return filename
-
-    def _download_html(self, url, headers, filename):
-        file = open(filename)
-        for line in file:
-            if line.strip():
-                # Check for a subversion index page
-                if re.search(r'<title>([^- ]+ - )?Revision \d+:', line):
-                    # it's a subversion index page:
-                    file.close()
-                    os.unlink(filename)
-                    return self._download_svn(url, filename)
-                break  # not an index page
-        file.close()
-        os.unlink(filename)
-        raise DistutilsError("Unexpected HTML page found at " + url)
-
-    def _download_svn(self, url, filename):
-        warnings.warn("SVN download support is deprecated", UserWarning)
-        url = url.split('#', 1)[0]  # remove any fragment for svn's sake
-        creds = ''
-        if url.lower().startswith('svn:') and '@' in url:
-            scheme, netloc, path, p, q, f = urllib.parse.urlparse(url)
-            if not netloc and path.startswith('//') and '/' in path[2:]:
-                netloc, path = path[2:].split('/', 1)
-                auth, host = _splituser(netloc)
-                if auth:
-                    if ':' in auth:
-                        user, pw = auth.split(':', 1)
-                        creds = " --username=%s --password=%s" % (user, pw)
-                    else:
-                        creds = " --username=" + auth
-                    netloc = host
-                    parts = scheme, netloc, url, p, q, f
-                    url = urllib.parse.urlunparse(parts)
-        self.info("Doing subversion checkout from %s to %s", url, filename)
-        os.system("svn checkout%s -q %s %s" % (creds, url, filename))
-        return filename
-
-    @staticmethod
-    def _vcs_split_rev_from_url(url, pop_prefix=False):
-        scheme, netloc, path, query, frag = urllib.parse.urlsplit(url)
-
-        scheme = scheme.split('+', 1)[-1]
-
-        # Some fragment identification fails
-        path = path.split('#', 1)[0]
-
-        rev = None
-        if '@' in path:
-            path, rev = path.rsplit('@', 1)
-
-        # Also, discard fragment
-        url = urllib.parse.urlunsplit((scheme, netloc, path, query, ''))
-
-        return url, rev
-
-    def _download_git(self, url, filename):
-        filename = filename.split('#', 1)[0]
-        url, rev = self._vcs_split_rev_from_url(url, pop_prefix=True)
-
-        self.info("Doing git clone from %s to %s", url, filename)
-        os.system("git clone --quiet %s %s" % (url, filename))
-
-        if rev is not None:
-            self.info("Checking out %s", rev)
-            os.system("git -C %s checkout --quiet %s" % (
-                filename,
-                rev,
-            ))
-
-        return filename
-
-    def _download_hg(self, url, filename):
-        filename = filename.split('#', 1)[0]
-        url, rev = self._vcs_split_rev_from_url(url, pop_prefix=True)
-
-        self.info("Doing hg clone from %s to %s", url, filename)
-        os.system("hg clone --quiet %s %s" % (url, filename))
-
-        if rev is not None:
-            self.info("Updating to %s", rev)
-            os.system("hg --cwd %s up -C -r %s -q" % (
-                filename,
-                rev,
-            ))
-
-        return filename
-
-    def debug(self, msg, *args):
-        log.debug(msg, *args)
-
-    def info(self, msg, *args):
-        log.info(msg, *args)
-
-    def warn(self, msg, *args):
-        log.warn(msg, *args)
-
-
-# This pattern matches a character entity reference (a decimal numeric
-# references, a hexadecimal numeric reference, or a named reference).
-entity_sub = re.compile(r'&(#(\d+|x[\da-fA-F]+)|[\w.:-]+);?').sub
-
-
-def decode_entity(match):
-    what = match.group(0)
-    return unescape(what)
-
-
-def htmldecode(text):
-    """
-    Decode HTML entities in the given text.
-
-    >>> htmldecode(
-    ...     'https://../package_name-0.1.2.tar.gz'
-    ...     '?tokena=A&amp;tokenb=B">package_name-0.1.2.tar.gz')
-    'https://../package_name-0.1.2.tar.gz?tokena=A&tokenb=B">package_name-0.1.2.tar.gz'
-    """
-    return entity_sub(decode_entity, text)
-
-
-def socket_timeout(timeout=15):
-    def _socket_timeout(func):
-        def _socket_timeout(*args, **kwargs):
-            old_timeout = socket.getdefaulttimeout()
-            socket.setdefaulttimeout(timeout)
-            try:
-                return func(*args, **kwargs)
-            finally:
-                socket.setdefaulttimeout(old_timeout)
-
-        return _socket_timeout
-
-    return _socket_timeout
-
-
-def _encode_auth(auth):
-    """
-    A function compatible with Python 2.3-3.3 that will encode
-    auth from a URL suitable for an HTTP header.
-    >>> str(_encode_auth('username%3Apassword'))
-    'dXNlcm5hbWU6cGFzc3dvcmQ='
-
-    Long auth strings should not cause a newline to be inserted.
-    >>> long_auth = 'username:' + 'password'*10
-    >>> chr(10) in str(_encode_auth(long_auth))
-    False
-    """
-    auth_s = urllib.parse.unquote(auth)
-    # convert to bytes
-    auth_bytes = auth_s.encode()
-    encoded_bytes = base64.b64encode(auth_bytes)
-    # convert back to a string
-    encoded = encoded_bytes.decode()
-    # strip the trailing carriage return
-    return encoded.replace('\n', '')
-
-
-class Credential:
-    """
-    A username/password pair. Use like a namedtuple.
-    """
-
-    def __init__(self, username, password):
-        self.username = username
-        self.password = password
-
-    def __iter__(self):
-        yield self.username
-        yield self.password
-
-    def __str__(self):
-        return '%(username)s:%(password)s' % vars(self)
-
-
-class PyPIConfig(configparser.RawConfigParser):
-    def __init__(self):
-        """
-        Load from ~/.pypirc
-        """
-        defaults = dict.fromkeys(['username', 'password', 'repository'], '')
-        configparser.RawConfigParser.__init__(self, defaults)
-
-        rc = os.path.join(os.path.expanduser('~'), '.pypirc')
-        if os.path.exists(rc):
-            self.read(rc)
-
-    @property
-    def creds_by_repository(self):
-        sections_with_repositories = [
-            section for section in self.sections()
-            if self.get(section, 'repository').strip()
-        ]
-
-        return dict(map(self._get_repo_cred, sections_with_repositories))
-
-    def _get_repo_cred(self, section):
-        repo = self.get(section, 'repository').strip()
-        return repo, Credential(
-            self.get(section, 'username').strip(),
-            self.get(section, 'password').strip(),
-        )
-
-    def find_credential(self, url):
-        """
-        If the URL indicated appears to be a repository defined in this
-        config, return the credential for that repository.
-        """
-        for repository, cred in self.creds_by_repository.items():
-            if url.startswith(repository):
-                return cred
-
-
-def open_with_auth(url, opener=urllib.request.urlopen):
-    """Open a urllib2 request, handling HTTP authentication"""
-
-    parsed = urllib.parse.urlparse(url)
-    scheme, netloc, path, params, query, frag = parsed
-
-    # Double scheme does not raise on Mac OS X as revealed by a
-    # failing test. We would expect "nonnumeric port". Refs #20.
-    if netloc.endswith(':'):
-        raise http_client.InvalidURL("nonnumeric port: ''")
-
-    if scheme in ('http', 'https'):
-        auth, address = _splituser(netloc)
-    else:
-        auth = None
-
-    if not auth:
-        cred = PyPIConfig().find_credential(url)
-        if cred:
-            auth = str(cred)
-            info = cred.username, url
-            log.info('Authenticating as %s for %s (from .pypirc)', *info)
-
-    if auth:
-        auth = "Basic " + _encode_auth(auth)
-        parts = scheme, address, path, params, query, frag
-        new_url = urllib.parse.urlunparse(parts)
-        request = urllib.request.Request(new_url)
-        request.add_header("Authorization", auth)
-    else:
-        request = urllib.request.Request(url)
-
-    request.add_header('User-Agent', user_agent)
-    fp = opener(request)
-
-    if auth:
-        # Put authentication info back into request URL if same host,
-        # so that links found on the page will work
-        s2, h2, path2, param2, query2, frag2 = urllib.parse.urlparse(fp.url)
-        if s2 == scheme and h2 == address:
-            parts = s2, netloc, path2, param2, query2, frag2
-            fp.url = urllib.parse.urlunparse(parts)
-
-    return fp
-
-
-# copy of urllib.parse._splituser from Python 3.8
-def _splituser(host):
-    """splituser('user[:passwd]@host[:port]')
-    --> 'user[:passwd]', 'host[:port]'."""
-    user, delim, host = host.rpartition('@')
-    return (user if delim else None), host
-
-
-# adding a timeout to avoid freezing package_index
-open_with_auth = socket_timeout(_SOCKET_TIMEOUT)(open_with_auth)
-
-
-def fix_sf_url(url):
-    return url  # backward compatibility
-
-
-def local_open(url):
-    """Read a local path, with special support for directories"""
-    scheme, server, path, param, query, frag = urllib.parse.urlparse(url)
-    filename = urllib.request.url2pathname(path)
-    if os.path.isfile(filename):
-        return urllib.request.urlopen(url)
-    elif path.endswith('/') and os.path.isdir(filename):
-        files = []
-        for f in os.listdir(filename):
-            filepath = os.path.join(filename, f)
-            if f == 'index.html':
-                with open(filepath, 'r') as fp:
-                    body = fp.read()
-                break
-            elif os.path.isdir(filepath):
-                f += '/'
-            files.append('<a href="{name}">{name}</a>'.format(name=f))
-        else:
-            tmpl = (
-                "<html><head><title>{url}</title>"
-                "</head><body>{files}</body></html>")
-            body = tmpl.format(url=url, files='\n'.join(files))
-        status, message = 200, "OK"
-    else:
-        status, message, body = 404, "Path not found", "Not found"
-
-    headers = {'content-type': 'text/html'}
-    body_stream = six.StringIO(body)
-    return urllib.error.HTTPError(url, status, message, headers, body_stream)