899 lines
34 KiB
Python
899 lines
34 KiB
Python
"""Routines related to PyPI, indexes"""
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from __future__ import absolute_import
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import cgi
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import itertools
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import logging
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import mimetypes
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import os
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import posixpath
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import re
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import sys
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from collections import namedtuple
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from pip._vendor import html5lib, requests, six
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from pip._vendor.distlib.compat import unescape
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from pip._vendor.packaging import specifiers
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from pip._vendor.packaging.utils import canonicalize_name
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from pip._vendor.packaging.version import parse as parse_version
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from pip._vendor.requests.exceptions import SSLError
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from pip._vendor.six.moves.urllib import parse as urllib_parse
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from pip._vendor.six.moves.urllib import request as urllib_request
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from pip._internal.download import HAS_TLS, is_url, path_to_url, url_to_path
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from pip._internal.exceptions import (
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BestVersionAlreadyInstalled, DistributionNotFound, InvalidWheelFilename,
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UnsupportedWheel,
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)
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from pip._internal.models.candidate import InstallationCandidate
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from pip._internal.models.format_control import FormatControl
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from pip._internal.models.index import PyPI
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from pip._internal.models.link import Link
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from pip._internal.pep425tags import get_supported
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from pip._internal.utils.compat import ipaddress
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from pip._internal.utils.deprecation import deprecated
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from pip._internal.utils.logging import indent_log
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from pip._internal.utils.misc import (
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ARCHIVE_EXTENSIONS, SUPPORTED_EXTENSIONS, normalize_path,
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remove_auth_from_url,
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)
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from pip._internal.utils.packaging import check_requires_python
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from pip._internal.wheel import Wheel, wheel_ext
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__all__ = ['FormatControl', 'PackageFinder']
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SECURE_ORIGINS = [
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# protocol, hostname, port
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# Taken from Chrome's list of secure origins (See: http://bit.ly/1qrySKC)
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("https", "*", "*"),
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("*", "localhost", "*"),
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("*", "127.0.0.0/8", "*"),
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("*", "::1/128", "*"),
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("file", "*", None),
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# ssh is always secure.
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("ssh", "*", "*"),
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]
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logger = logging.getLogger(__name__)
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def _get_content_type(url, session):
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"""Get the Content-Type of the given url, using a HEAD request"""
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scheme, netloc, path, query, fragment = urllib_parse.urlsplit(url)
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if scheme not in {'http', 'https'}:
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# FIXME: some warning or something?
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# assertion error?
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return ''
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resp = session.head(url, allow_redirects=True)
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resp.raise_for_status()
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return resp.headers.get("Content-Type", "")
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def _handle_get_page_fail(link, reason, url, meth=None):
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if meth is None:
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meth = logger.debug
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meth("Could not fetch URL %s: %s - skipping", link, reason)
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def _get_html_page(link, session=None):
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if session is None:
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raise TypeError(
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"_get_html_page() missing 1 required keyword argument: 'session'"
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)
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url = link.url
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url = url.split('#', 1)[0]
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# Check for VCS schemes that do not support lookup as web pages.
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from pip._internal.vcs import VcsSupport
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for scheme in VcsSupport.schemes:
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if url.lower().startswith(scheme) and url[len(scheme)] in '+:':
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logger.debug('Cannot look at %s URL %s', scheme, link)
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return None
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try:
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filename = link.filename
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for bad_ext in ARCHIVE_EXTENSIONS:
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if filename.endswith(bad_ext):
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content_type = _get_content_type(url, session=session)
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if content_type.lower().startswith('text/html'):
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break
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else:
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logger.debug(
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'Skipping page %s because of Content-Type: %s',
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link,
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content_type,
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)
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return
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logger.debug('Getting page %s', url)
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# Tack index.html onto file:// URLs that point to directories
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(scheme, netloc, path, params, query, fragment) = \
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urllib_parse.urlparse(url)
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if (scheme == 'file' and
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os.path.isdir(urllib_request.url2pathname(path))):
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# add trailing slash if not present so urljoin doesn't trim
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# final segment
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if not url.endswith('/'):
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url += '/'
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url = urllib_parse.urljoin(url, 'index.html')
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logger.debug(' file: URL is directory, getting %s', url)
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resp = session.get(
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url,
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headers={
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"Accept": "text/html",
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# We don't want to blindly returned cached data for
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# /simple/, because authors generally expecting that
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# twine upload && pip install will function, but if
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# they've done a pip install in the last ~10 minutes
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# it won't. Thus by setting this to zero we will not
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# blindly use any cached data, however the benefit of
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# using max-age=0 instead of no-cache, is that we will
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# still support conditional requests, so we will still
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# minimize traffic sent in cases where the page hasn't
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# changed at all, we will just always incur the round
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# trip for the conditional GET now instead of only
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# once per 10 minutes.
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# For more information, please see pypa/pip#5670.
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"Cache-Control": "max-age=0",
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},
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)
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resp.raise_for_status()
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# The check for archives above only works if the url ends with
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# something that looks like an archive. However that is not a
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# requirement of an url. Unless we issue a HEAD request on every
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# url we cannot know ahead of time for sure if something is HTML
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# or not. However we can check after we've downloaded it.
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content_type = resp.headers.get('Content-Type', 'unknown')
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if not content_type.lower().startswith("text/html"):
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logger.debug(
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'Skipping page %s because of Content-Type: %s',
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link,
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content_type,
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)
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return
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inst = HTMLPage(resp.content, resp.url, resp.headers)
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except requests.HTTPError as exc:
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_handle_get_page_fail(link, exc, url)
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except SSLError as exc:
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reason = "There was a problem confirming the ssl certificate: "
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reason += str(exc)
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_handle_get_page_fail(link, reason, url, meth=logger.info)
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except requests.ConnectionError as exc:
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_handle_get_page_fail(link, "connection error: %s" % exc, url)
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except requests.Timeout:
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_handle_get_page_fail(link, "timed out", url)
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else:
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return inst
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class PackageFinder(object):
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"""This finds packages.
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This is meant to match easy_install's technique for looking for
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packages, by reading pages and looking for appropriate links.
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"""
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def __init__(self, find_links, index_urls, allow_all_prereleases=False,
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trusted_hosts=None, process_dependency_links=False,
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session=None, format_control=None, platform=None,
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versions=None, abi=None, implementation=None,
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prefer_binary=False):
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"""Create a PackageFinder.
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:param format_control: A FormatControl object or None. Used to control
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the selection of source packages / binary packages when consulting
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the index and links.
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:param platform: A string or None. If None, searches for packages
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that are supported by the current system. Otherwise, will find
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packages that can be built on the platform passed in. These
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packages will only be downloaded for distribution: they will
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not be built locally.
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:param versions: A list of strings or None. This is passed directly
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to pep425tags.py in the get_supported() method.
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:param abi: A string or None. This is passed directly
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to pep425tags.py in the get_supported() method.
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:param implementation: A string or None. This is passed directly
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to pep425tags.py in the get_supported() method.
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"""
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if session is None:
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raise TypeError(
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"PackageFinder() missing 1 required keyword argument: "
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"'session'"
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)
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# Build find_links. If an argument starts with ~, it may be
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# a local file relative to a home directory. So try normalizing
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# it and if it exists, use the normalized version.
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# This is deliberately conservative - it might be fine just to
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# blindly normalize anything starting with a ~...
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self.find_links = []
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for link in find_links:
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if link.startswith('~'):
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new_link = normalize_path(link)
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if os.path.exists(new_link):
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link = new_link
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self.find_links.append(link)
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self.index_urls = index_urls
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self.dependency_links = []
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# These are boring links that have already been logged somehow:
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self.logged_links = set()
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self.format_control = format_control or FormatControl(set(), set())
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# Domains that we won't emit warnings for when not using HTTPS
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self.secure_origins = [
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("*", host, "*")
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for host in (trusted_hosts if trusted_hosts else [])
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]
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# Do we want to allow _all_ pre-releases?
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self.allow_all_prereleases = allow_all_prereleases
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# Do we process dependency links?
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self.process_dependency_links = process_dependency_links
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# The Session we'll use to make requests
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self.session = session
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# The valid tags to check potential found wheel candidates against
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self.valid_tags = get_supported(
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versions=versions,
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platform=platform,
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abi=abi,
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impl=implementation,
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)
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# Do we prefer old, but valid, binary dist over new source dist
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self.prefer_binary = prefer_binary
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# If we don't have TLS enabled, then WARN if anyplace we're looking
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# relies on TLS.
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if not HAS_TLS:
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for link in itertools.chain(self.index_urls, self.find_links):
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parsed = urllib_parse.urlparse(link)
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if parsed.scheme == "https":
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logger.warning(
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"pip is configured with locations that require "
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"TLS/SSL, however the ssl module in Python is not "
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"available."
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)
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break
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def get_formatted_locations(self):
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lines = []
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if self.index_urls and self.index_urls != [PyPI.simple_url]:
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lines.append(
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"Looking in indexes: {}".format(", ".join(
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remove_auth_from_url(url) for url in self.index_urls))
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)
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if self.find_links:
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lines.append(
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"Looking in links: {}".format(", ".join(self.find_links))
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)
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return "\n".join(lines)
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def add_dependency_links(self, links):
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# FIXME: this shouldn't be global list this, it should only
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# apply to requirements of the package that specifies the
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# dependency_links value
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# FIXME: also, we should track comes_from (i.e., use Link)
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if self.process_dependency_links:
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deprecated(
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"Dependency Links processing has been deprecated and will be "
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"removed in a future release.",
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replacement="PEP 508 URL dependencies",
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gone_in="18.2",
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issue=4187,
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)
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self.dependency_links.extend(links)
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@staticmethod
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def _sort_locations(locations, expand_dir=False):
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"""
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Sort locations into "files" (archives) and "urls", and return
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a pair of lists (files,urls)
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"""
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files = []
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urls = []
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# puts the url for the given file path into the appropriate list
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def sort_path(path):
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url = path_to_url(path)
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if mimetypes.guess_type(url, strict=False)[0] == 'text/html':
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urls.append(url)
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else:
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files.append(url)
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for url in locations:
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is_local_path = os.path.exists(url)
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is_file_url = url.startswith('file:')
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if is_local_path or is_file_url:
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if is_local_path:
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path = url
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else:
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path = url_to_path(url)
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if os.path.isdir(path):
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if expand_dir:
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path = os.path.realpath(path)
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for item in os.listdir(path):
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sort_path(os.path.join(path, item))
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elif is_file_url:
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urls.append(url)
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elif os.path.isfile(path):
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sort_path(path)
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else:
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logger.warning(
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"Url '%s' is ignored: it is neither a file "
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"nor a directory.", url,
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)
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elif is_url(url):
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# Only add url with clear scheme
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urls.append(url)
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else:
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logger.warning(
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"Url '%s' is ignored. It is either a non-existing "
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"path or lacks a specific scheme.", url,
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)
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return files, urls
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def _candidate_sort_key(self, candidate):
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"""
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Function used to generate link sort key for link tuples.
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The greater the return value, the more preferred it is.
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If not finding wheels, then sorted by version only.
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If finding wheels, then the sort order is by version, then:
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1. existing installs
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2. wheels ordered via Wheel.support_index_min(self.valid_tags)
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3. source archives
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If prefer_binary was set, then all wheels are sorted above sources.
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Note: it was considered to embed this logic into the Link
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comparison operators, but then different sdist links
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with the same version, would have to be considered equal
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"""
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support_num = len(self.valid_tags)
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build_tag = tuple()
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binary_preference = 0
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if candidate.location.is_wheel:
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# can raise InvalidWheelFilename
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wheel = Wheel(candidate.location.filename)
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if not wheel.supported(self.valid_tags):
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raise UnsupportedWheel(
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"%s is not a supported wheel for this platform. It "
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"can't be sorted." % wheel.filename
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)
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if self.prefer_binary:
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binary_preference = 1
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pri = -(wheel.support_index_min(self.valid_tags))
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if wheel.build_tag is not None:
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match = re.match(r'^(\d+)(.*)$', wheel.build_tag)
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build_tag_groups = match.groups()
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build_tag = (int(build_tag_groups[0]), build_tag_groups[1])
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else: # sdist
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pri = -(support_num)
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return (binary_preference, candidate.version, build_tag, pri)
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def _validate_secure_origin(self, logger, location):
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# Determine if this url used a secure transport mechanism
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parsed = urllib_parse.urlparse(str(location))
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origin = (parsed.scheme, parsed.hostname, parsed.port)
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# The protocol to use to see if the protocol matches.
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# Don't count the repository type as part of the protocol: in
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# cases such as "git+ssh", only use "ssh". (I.e., Only verify against
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# the last scheme.)
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protocol = origin[0].rsplit('+', 1)[-1]
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# Determine if our origin is a secure origin by looking through our
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# hardcoded list of secure origins, as well as any additional ones
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# configured on this PackageFinder instance.
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for secure_origin in (SECURE_ORIGINS + self.secure_origins):
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if protocol != secure_origin[0] and secure_origin[0] != "*":
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continue
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try:
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# We need to do this decode dance to ensure that we have a
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# unicode object, even on Python 2.x.
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addr = ipaddress.ip_address(
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origin[1]
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if (
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isinstance(origin[1], six.text_type) or
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origin[1] is None
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)
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else origin[1].decode("utf8")
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)
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network = ipaddress.ip_network(
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secure_origin[1]
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if isinstance(secure_origin[1], six.text_type)
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else secure_origin[1].decode("utf8")
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)
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except ValueError:
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# We don't have both a valid address or a valid network, so
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# we'll check this origin against hostnames.
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if (origin[1] and
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origin[1].lower() != secure_origin[1].lower() and
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secure_origin[1] != "*"):
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continue
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else:
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# We have a valid address and network, so see if the address
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# is contained within the network.
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if addr not in network:
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continue
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# Check to see if the port patches
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if (origin[2] != secure_origin[2] and
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secure_origin[2] != "*" and
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secure_origin[2] is not None):
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continue
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# If we've gotten here, then this origin matches the current
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# secure origin and we should return True
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return True
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# If we've gotten to this point, then the origin isn't secure and we
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# will not accept it as a valid location to search. We will however
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# log a warning that we are ignoring it.
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logger.warning(
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"The repository located at %s is not a trusted or secure host and "
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"is being ignored. If this repository is available via HTTPS we "
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"recommend you use HTTPS instead, otherwise you may silence "
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"this warning and allow it anyway with '--trusted-host %s'.",
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parsed.hostname,
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parsed.hostname,
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)
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return False
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|
|
def _get_index_urls_locations(self, project_name):
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"""Returns the locations found via self.index_urls
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Checks the url_name on the main (first in the list) index and
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use this url_name to produce all locations
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"""
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|
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def mkurl_pypi_url(url):
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loc = posixpath.join(
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url,
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urllib_parse.quote(canonicalize_name(project_name)))
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# For maximum compatibility with easy_install, ensure the path
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# ends in a trailing slash. Although this isn't in the spec
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# (and PyPI can handle it without the slash) some other index
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|
# implementations might break if they relied on easy_install's
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# behavior.
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if not loc.endswith('/'):
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loc = loc + '/'
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return loc
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return [mkurl_pypi_url(url) for url in self.index_urls]
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|
|
def find_all_candidates(self, project_name):
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"""Find all available InstallationCandidate for project_name
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|
This checks index_urls, find_links and dependency_links.
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All versions found are returned as an InstallationCandidate list.
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See _link_package_versions for details on which files are accepted
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"""
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|
index_locations = self._get_index_urls_locations(project_name)
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index_file_loc, index_url_loc = self._sort_locations(index_locations)
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fl_file_loc, fl_url_loc = self._sort_locations(
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self.find_links, expand_dir=True,
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)
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dep_file_loc, dep_url_loc = self._sort_locations(self.dependency_links)
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file_locations = (Link(url) for url in itertools.chain(
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index_file_loc, fl_file_loc, dep_file_loc,
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))
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# We trust every url that the user has given us whether it was given
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|
# via --index-url or --find-links
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|
# We explicitly do not trust links that came from dependency_links
|
|
# We want to filter out any thing which does not have a secure origin.
|
|
url_locations = [
|
|
link for link in itertools.chain(
|
|
(Link(url) for url in index_url_loc),
|
|
(Link(url) for url in fl_url_loc),
|
|
(Link(url) for url in dep_url_loc),
|
|
)
|
|
if self._validate_secure_origin(logger, link)
|
|
]
|
|
|
|
logger.debug('%d location(s) to search for versions of %s:',
|
|
len(url_locations), project_name)
|
|
|
|
for location in url_locations:
|
|
logger.debug('* %s', location)
|
|
|
|
canonical_name = canonicalize_name(project_name)
|
|
formats = self.format_control.get_allowed_formats(canonical_name)
|
|
search = Search(project_name, canonical_name, formats)
|
|
find_links_versions = self._package_versions(
|
|
# We trust every directly linked archive in find_links
|
|
(Link(url, '-f') for url in self.find_links),
|
|
search
|
|
)
|
|
|
|
page_versions = []
|
|
for page in self._get_pages(url_locations, project_name):
|
|
logger.debug('Analyzing links from page %s', page.url)
|
|
with indent_log():
|
|
page_versions.extend(
|
|
self._package_versions(page.iter_links(), search)
|
|
)
|
|
|
|
dependency_versions = self._package_versions(
|
|
(Link(url) for url in self.dependency_links), search
|
|
)
|
|
if dependency_versions:
|
|
logger.debug(
|
|
'dependency_links found: %s',
|
|
', '.join([
|
|
version.location.url for version in dependency_versions
|
|
])
|
|
)
|
|
|
|
file_versions = self._package_versions(file_locations, search)
|
|
if file_versions:
|
|
file_versions.sort(reverse=True)
|
|
logger.debug(
|
|
'Local files found: %s',
|
|
', '.join([
|
|
url_to_path(candidate.location.url)
|
|
for candidate in file_versions
|
|
])
|
|
)
|
|
|
|
# This is an intentional priority ordering
|
|
return (
|
|
file_versions + find_links_versions + page_versions +
|
|
dependency_versions
|
|
)
|
|
|
|
def find_requirement(self, req, upgrade):
|
|
"""Try to find a Link matching req
|
|
|
|
Expects req, an InstallRequirement and upgrade, a boolean
|
|
Returns a Link if found,
|
|
Raises DistributionNotFound or BestVersionAlreadyInstalled otherwise
|
|
"""
|
|
all_candidates = self.find_all_candidates(req.name)
|
|
|
|
# Filter out anything which doesn't match our specifier
|
|
compatible_versions = set(
|
|
req.specifier.filter(
|
|
# We turn the version object into a str here because otherwise
|
|
# when we're debundled but setuptools isn't, Python will see
|
|
# packaging.version.Version and
|
|
# pkg_resources._vendor.packaging.version.Version as different
|
|
# types. This way we'll use a str as a common data interchange
|
|
# format. If we stop using the pkg_resources provided specifier
|
|
# and start using our own, we can drop the cast to str().
|
|
[str(c.version) for c in all_candidates],
|
|
prereleases=(
|
|
self.allow_all_prereleases
|
|
if self.allow_all_prereleases else None
|
|
),
|
|
)
|
|
)
|
|
applicable_candidates = [
|
|
# Again, converting to str to deal with debundling.
|
|
c for c in all_candidates if str(c.version) in compatible_versions
|
|
]
|
|
|
|
if applicable_candidates:
|
|
best_candidate = max(applicable_candidates,
|
|
key=self._candidate_sort_key)
|
|
else:
|
|
best_candidate = None
|
|
|
|
if req.satisfied_by is not None:
|
|
installed_version = parse_version(req.satisfied_by.version)
|
|
else:
|
|
installed_version = None
|
|
|
|
if installed_version is None and best_candidate is None:
|
|
logger.critical(
|
|
'Could not find a version that satisfies the requirement %s '
|
|
'(from versions: %s)',
|
|
req,
|
|
', '.join(
|
|
sorted(
|
|
{str(c.version) for c in all_candidates},
|
|
key=parse_version,
|
|
)
|
|
)
|
|
)
|
|
|
|
raise DistributionNotFound(
|
|
'No matching distribution found for %s' % req
|
|
)
|
|
|
|
best_installed = False
|
|
if installed_version and (
|
|
best_candidate is None or
|
|
best_candidate.version <= installed_version):
|
|
best_installed = True
|
|
|
|
if not upgrade and installed_version is not None:
|
|
if best_installed:
|
|
logger.debug(
|
|
'Existing installed version (%s) is most up-to-date and '
|
|
'satisfies requirement',
|
|
installed_version,
|
|
)
|
|
else:
|
|
logger.debug(
|
|
'Existing installed version (%s) satisfies requirement '
|
|
'(most up-to-date version is %s)',
|
|
installed_version,
|
|
best_candidate.version,
|
|
)
|
|
return None
|
|
|
|
if best_installed:
|
|
# We have an existing version, and its the best version
|
|
logger.debug(
|
|
'Installed version (%s) is most up-to-date (past versions: '
|
|
'%s)',
|
|
installed_version,
|
|
', '.join(sorted(compatible_versions, key=parse_version)) or
|
|
"none",
|
|
)
|
|
raise BestVersionAlreadyInstalled
|
|
|
|
logger.debug(
|
|
'Using version %s (newest of versions: %s)',
|
|
best_candidate.version,
|
|
', '.join(sorted(compatible_versions, key=parse_version))
|
|
)
|
|
return best_candidate.location
|
|
|
|
def _get_pages(self, locations, project_name):
|
|
"""
|
|
Yields (page, page_url) from the given locations, skipping
|
|
locations that have errors.
|
|
"""
|
|
seen = set()
|
|
for location in locations:
|
|
if location in seen:
|
|
continue
|
|
seen.add(location)
|
|
|
|
page = self._get_page(location)
|
|
if page is None:
|
|
continue
|
|
|
|
yield page
|
|
|
|
_py_version_re = re.compile(r'-py([123]\.?[0-9]?)$')
|
|
|
|
def _sort_links(self, links):
|
|
"""
|
|
Returns elements of links in order, non-egg links first, egg links
|
|
second, while eliminating duplicates
|
|
"""
|
|
eggs, no_eggs = [], []
|
|
seen = set()
|
|
for link in links:
|
|
if link not in seen:
|
|
seen.add(link)
|
|
if link.egg_fragment:
|
|
eggs.append(link)
|
|
else:
|
|
no_eggs.append(link)
|
|
return no_eggs + eggs
|
|
|
|
def _package_versions(self, links, search):
|
|
result = []
|
|
for link in self._sort_links(links):
|
|
v = self._link_package_versions(link, search)
|
|
if v is not None:
|
|
result.append(v)
|
|
return result
|
|
|
|
def _log_skipped_link(self, link, reason):
|
|
if link not in self.logged_links:
|
|
logger.debug('Skipping link %s; %s', link, reason)
|
|
self.logged_links.add(link)
|
|
|
|
def _link_package_versions(self, link, search):
|
|
"""Return an InstallationCandidate or None"""
|
|
version = None
|
|
if link.egg_fragment:
|
|
egg_info = link.egg_fragment
|
|
ext = link.ext
|
|
else:
|
|
egg_info, ext = link.splitext()
|
|
if not ext:
|
|
self._log_skipped_link(link, 'not a file')
|
|
return
|
|
if ext not in SUPPORTED_EXTENSIONS:
|
|
self._log_skipped_link(
|
|
link, 'unsupported archive format: %s' % ext,
|
|
)
|
|
return
|
|
if "binary" not in search.formats and ext == wheel_ext:
|
|
self._log_skipped_link(
|
|
link, 'No binaries permitted for %s' % search.supplied,
|
|
)
|
|
return
|
|
if "macosx10" in link.path and ext == '.zip':
|
|
self._log_skipped_link(link, 'macosx10 one')
|
|
return
|
|
if ext == wheel_ext:
|
|
try:
|
|
wheel = Wheel(link.filename)
|
|
except InvalidWheelFilename:
|
|
self._log_skipped_link(link, 'invalid wheel filename')
|
|
return
|
|
if canonicalize_name(wheel.name) != search.canonical:
|
|
self._log_skipped_link(
|
|
link, 'wrong project name (not %s)' % search.supplied)
|
|
return
|
|
|
|
if not wheel.supported(self.valid_tags):
|
|
self._log_skipped_link(
|
|
link, 'it is not compatible with this Python')
|
|
return
|
|
|
|
version = wheel.version
|
|
|
|
# This should be up by the search.ok_binary check, but see issue 2700.
|
|
if "source" not in search.formats and ext != wheel_ext:
|
|
self._log_skipped_link(
|
|
link, 'No sources permitted for %s' % search.supplied,
|
|
)
|
|
return
|
|
|
|
if not version:
|
|
version = egg_info_matches(egg_info, search.supplied, link)
|
|
if version is None:
|
|
self._log_skipped_link(
|
|
link, 'Missing project version for %s' % search.supplied)
|
|
return
|
|
|
|
match = self._py_version_re.search(version)
|
|
if match:
|
|
version = version[:match.start()]
|
|
py_version = match.group(1)
|
|
if py_version != sys.version[:3]:
|
|
self._log_skipped_link(
|
|
link, 'Python version is incorrect')
|
|
return
|
|
try:
|
|
support_this_python = check_requires_python(link.requires_python)
|
|
except specifiers.InvalidSpecifier:
|
|
logger.debug("Package %s has an invalid Requires-Python entry: %s",
|
|
link.filename, link.requires_python)
|
|
support_this_python = True
|
|
|
|
if not support_this_python:
|
|
logger.debug("The package %s is incompatible with the python"
|
|
"version in use. Acceptable python versions are:%s",
|
|
link, link.requires_python)
|
|
return
|
|
logger.debug('Found link %s, version: %s', link, version)
|
|
|
|
return InstallationCandidate(search.supplied, version, link)
|
|
|
|
def _get_page(self, link):
|
|
return _get_html_page(link, session=self.session)
|
|
|
|
|
|
def egg_info_matches(
|
|
egg_info, search_name, link,
|
|
_egg_info_re=re.compile(r'([a-z0-9_.]+)-([a-z0-9_.!+-]+)', re.I)):
|
|
"""Pull the version part out of a string.
|
|
|
|
:param egg_info: The string to parse. E.g. foo-2.1
|
|
:param search_name: The name of the package this belongs to. None to
|
|
infer the name. Note that this cannot unambiguously parse strings
|
|
like foo-2-2 which might be foo, 2-2 or foo-2, 2.
|
|
:param link: The link the string came from, for logging on failure.
|
|
"""
|
|
match = _egg_info_re.search(egg_info)
|
|
if not match:
|
|
logger.debug('Could not parse version from link: %s', link)
|
|
return None
|
|
if search_name is None:
|
|
full_match = match.group(0)
|
|
return full_match.split('-', 1)[-1]
|
|
name = match.group(0).lower()
|
|
# To match the "safe" name that pkg_resources creates:
|
|
name = name.replace('_', '-')
|
|
# project name and version must be separated by a dash
|
|
look_for = search_name.lower() + "-"
|
|
if name.startswith(look_for):
|
|
return match.group(0)[len(look_for):]
|
|
else:
|
|
return None
|
|
|
|
|
|
def _determine_base_url(document, page_url):
|
|
"""Determine the HTML document's base URL.
|
|
|
|
This looks for a ``<base>`` tag in the HTML document. If present, its href
|
|
attribute denotes the base URL of anchor tags in the document. If there is
|
|
no such tag (or if it does not have a valid href attribute), the HTML
|
|
file's URL is used as the base URL.
|
|
|
|
:param document: An HTML document representation. The current
|
|
implementation expects the result of ``html5lib.parse()``.
|
|
:param page_url: The URL of the HTML document.
|
|
"""
|
|
for base in document.findall(".//base"):
|
|
href = base.get("href")
|
|
if href is not None:
|
|
return href
|
|
return page_url
|
|
|
|
|
|
def _get_encoding_from_headers(headers):
|
|
"""Determine if we have any encoding information in our headers.
|
|
"""
|
|
if headers and "Content-Type" in headers:
|
|
content_type, params = cgi.parse_header(headers["Content-Type"])
|
|
if "charset" in params:
|
|
return params['charset']
|
|
return None
|
|
|
|
|
|
_CLEAN_LINK_RE = re.compile(r'[^a-z0-9$&+,/:;=?@.#%_\\|-]', re.I)
|
|
|
|
|
|
def _clean_link(url):
|
|
"""Makes sure a link is fully encoded. That is, if a ' ' shows up in
|
|
the link, it will be rewritten to %20 (while not over-quoting
|
|
% or other characters)."""
|
|
return _CLEAN_LINK_RE.sub(lambda match: '%%%2x' % ord(match.group(0)), url)
|
|
|
|
|
|
class HTMLPage(object):
|
|
"""Represents one page, along with its URL"""
|
|
|
|
def __init__(self, content, url, headers=None):
|
|
self.content = content
|
|
self.url = url
|
|
self.headers = headers
|
|
|
|
def __str__(self):
|
|
return self.url
|
|
|
|
def iter_links(self):
|
|
"""Yields all links in the page"""
|
|
document = html5lib.parse(
|
|
self.content,
|
|
transport_encoding=_get_encoding_from_headers(self.headers),
|
|
namespaceHTMLElements=False,
|
|
)
|
|
base_url = _determine_base_url(document, self.url)
|
|
for anchor in document.findall(".//a"):
|
|
if anchor.get("href"):
|
|
href = anchor.get("href")
|
|
url = _clean_link(urllib_parse.urljoin(base_url, href))
|
|
pyrequire = anchor.get('data-requires-python')
|
|
pyrequire = unescape(pyrequire) if pyrequire else None
|
|
yield Link(url, self.url, requires_python=pyrequire)
|
|
|
|
|
|
Search = namedtuple('Search', 'supplied canonical formats')
|
|
"""Capture key aspects of a search.
|
|
|
|
:attribute supplied: The user supplied package.
|
|
:attribute canonical: The canonical package name.
|
|
:attribute formats: The formats allowed for this package. Should be a set
|
|
with 'binary' or 'source' or both in it.
|
|
"""
|