mirror of https://github.com/pypa/pip
693 lines
22 KiB
Python
693 lines
22 KiB
Python
"""
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The main purpose of this module is to expose LinkCollector.collect_links().
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"""
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import cgi
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import functools
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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 re
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from collections import OrderedDict
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from pip._vendor import html5lib, requests
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from pip._vendor.distlib.compat import unescape
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from pip._vendor.requests.exceptions import RetryError, 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.exceptions import NetworkConnectionError
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from pip._internal.models.link import Link
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from pip._internal.models.search_scope import SearchScope
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from pip._internal.network.utils import raise_for_status
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from pip._internal.utils.filetypes import ARCHIVE_EXTENSIONS
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from pip._internal.utils.misc import pairwise, redact_auth_from_url
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from pip._internal.utils.typing import MYPY_CHECK_RUNNING
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from pip._internal.utils.urls import path_to_url, url_to_path
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from pip._internal.vcs import is_url, vcs
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if MYPY_CHECK_RUNNING:
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from optparse import Values
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from typing import (
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Callable, Iterable, List, MutableMapping, Optional,
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Protocol, Sequence, Tuple, TypeVar, Union,
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)
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import xml.etree.ElementTree
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from pip._vendor.requests import Response
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from pip._internal.network.session import PipSession
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HTMLElement = xml.etree.ElementTree.Element
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ResponseHeaders = MutableMapping[str, str]
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# Used in the @lru_cache polyfill.
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F = TypeVar('F')
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class LruCache(Protocol):
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def __call__(self, maxsize=None):
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# type: (Optional[int]) -> Callable[[F], F]
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raise NotImplementedError
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logger = logging.getLogger(__name__)
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# Fallback to noop_lru_cache in Python 2
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# TODO: this can be removed when python 2 support is dropped!
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def noop_lru_cache(maxsize=None):
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# type: (Optional[int]) -> Callable[[F], F]
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def _wrapper(f):
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# type: (F) -> F
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return f
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return _wrapper
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_lru_cache = getattr(functools, "lru_cache", noop_lru_cache) # type: LruCache
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def _match_vcs_scheme(url):
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# type: (str) -> Optional[str]
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"""Look for VCS schemes in the URL.
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Returns the matched VCS scheme, or None if there's no match.
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"""
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for scheme in vcs.schemes:
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if url.lower().startswith(scheme) and url[len(scheme)] in '+:':
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return scheme
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return None
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def _is_url_like_archive(url):
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# type: (str) -> bool
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"""Return whether the URL looks like an archive.
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"""
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filename = Link(url).filename
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for bad_ext in ARCHIVE_EXTENSIONS:
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if filename.endswith(bad_ext):
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return True
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return False
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class _NotHTML(Exception):
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def __init__(self, content_type, request_desc):
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# type: (str, str) -> None
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super(_NotHTML, self).__init__(content_type, request_desc)
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self.content_type = content_type
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self.request_desc = request_desc
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def _ensure_html_header(response):
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# type: (Response) -> None
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"""Check the Content-Type header to ensure the response contains HTML.
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Raises `_NotHTML` if the content type is not text/html.
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"""
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content_type = response.headers.get("Content-Type", "")
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if not content_type.lower().startswith("text/html"):
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raise _NotHTML(content_type, response.request.method)
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class _NotHTTP(Exception):
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pass
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def _ensure_html_response(url, session):
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# type: (str, PipSession) -> None
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"""Send a HEAD request to the URL, and ensure the response contains HTML.
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Raises `_NotHTTP` if the URL is not available for a HEAD request, or
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`_NotHTML` if the content type is not text/html.
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"""
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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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raise _NotHTTP()
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resp = session.head(url, allow_redirects=True)
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raise_for_status(resp)
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_ensure_html_header(resp)
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def _get_html_response(url, session):
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# type: (str, PipSession) -> Response
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"""Access an HTML page with GET, and return the response.
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This consists of three parts:
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1. If the URL looks suspiciously like an archive, send a HEAD first to
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check the Content-Type is HTML, to avoid downloading a large file.
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Raise `_NotHTTP` if the content type cannot be determined, or
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`_NotHTML` if it is not HTML.
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2. Actually perform the request. Raise HTTP exceptions on network failures.
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3. Check the Content-Type header to make sure we got HTML, and raise
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`_NotHTML` otherwise.
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"""
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if _is_url_like_archive(url):
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_ensure_html_response(url, session=session)
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logger.debug('Getting page %s', redact_auth_from_url(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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raise_for_status(resp)
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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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_ensure_html_header(resp)
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return resp
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def _get_encoding_from_headers(headers):
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# type: (ResponseHeaders) -> Optional[str]
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"""Determine if we have any encoding information in our headers.
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"""
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if headers and "Content-Type" in headers:
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content_type, params = cgi.parse_header(headers["Content-Type"])
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if "charset" in params:
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return params['charset']
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return None
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def _determine_base_url(document, page_url):
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# type: (HTMLElement, str) -> str
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"""Determine the HTML document's base URL.
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This looks for a ``<base>`` tag in the HTML document. If present, its href
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attribute denotes the base URL of anchor tags in the document. If there is
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no such tag (or if it does not have a valid href attribute), the HTML
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file's URL is used as the base URL.
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:param document: An HTML document representation. The current
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implementation expects the result of ``html5lib.parse()``.
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:param page_url: The URL of the HTML document.
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"""
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for base in document.findall(".//base"):
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href = base.get("href")
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if href is not None:
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return href
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return page_url
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def _clean_url_path_part(part):
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# type: (str) -> str
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"""
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Clean a "part" of a URL path (i.e. after splitting on "@" characters).
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"""
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# We unquote prior to quoting to make sure nothing is double quoted.
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return urllib_parse.quote(urllib_parse.unquote(part))
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def _clean_file_url_path(part):
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# type: (str) -> str
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"""
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Clean the first part of a URL path that corresponds to a local
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filesystem path (i.e. the first part after splitting on "@" characters).
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"""
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# We unquote prior to quoting to make sure nothing is double quoted.
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# Also, on Windows the path part might contain a drive letter which
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# should not be quoted. On Linux where drive letters do not
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# exist, the colon should be quoted. We rely on urllib.request
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# to do the right thing here.
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return urllib_request.pathname2url(urllib_request.url2pathname(part))
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# percent-encoded: /
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_reserved_chars_re = re.compile('(@|%2F)', re.IGNORECASE)
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def _clean_url_path(path, is_local_path):
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# type: (str, bool) -> str
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"""
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Clean the path portion of a URL.
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"""
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if is_local_path:
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clean_func = _clean_file_url_path
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else:
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clean_func = _clean_url_path_part
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# Split on the reserved characters prior to cleaning so that
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# revision strings in VCS URLs are properly preserved.
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parts = _reserved_chars_re.split(path)
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cleaned_parts = []
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for to_clean, reserved in pairwise(itertools.chain(parts, [''])):
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cleaned_parts.append(clean_func(to_clean))
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# Normalize %xx escapes (e.g. %2f -> %2F)
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cleaned_parts.append(reserved.upper())
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return ''.join(cleaned_parts)
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def _clean_link(url):
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# type: (str) -> str
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"""
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Make sure a link is fully quoted.
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For example, if ' ' occurs in the URL, it will be replaced with "%20",
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and without double-quoting other characters.
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"""
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# Split the URL into parts according to the general structure
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# `scheme://netloc/path;parameters?query#fragment`.
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result = urllib_parse.urlparse(url)
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# If the netloc is empty, then the URL refers to a local filesystem path.
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is_local_path = not result.netloc
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path = _clean_url_path(result.path, is_local_path=is_local_path)
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return urllib_parse.urlunparse(result._replace(path=path))
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def _create_link_from_element(
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anchor, # type: HTMLElement
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page_url, # type: str
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base_url, # type: str
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):
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# type: (...) -> Optional[Link]
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"""
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Convert an anchor element in a simple repository page to a Link.
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"""
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href = anchor.get("href")
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if not href:
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return None
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url = _clean_link(urllib_parse.urljoin(base_url, href))
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pyrequire = anchor.get('data-requires-python')
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pyrequire = unescape(pyrequire) if pyrequire else None
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yanked_reason = anchor.get('data-yanked')
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if yanked_reason:
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# This is a unicode string in Python 2 (and 3).
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yanked_reason = unescape(yanked_reason)
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link = Link(
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url,
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comes_from=page_url,
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requires_python=pyrequire,
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yanked_reason=yanked_reason,
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)
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return link
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class CacheablePageContent(object):
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def __init__(self, page):
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# type: (HTMLPage) -> None
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assert page.cache_link_parsing
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self.page = page
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def __eq__(self, other):
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# type: (object) -> bool
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return (isinstance(other, type(self)) and
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self.page.url == other.page.url)
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def __hash__(self):
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# type: () -> int
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return hash(self.page.url)
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def with_cached_html_pages(
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fn, # type: Callable[[HTMLPage], Iterable[Link]]
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):
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# type: (...) -> Callable[[HTMLPage], List[Link]]
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"""
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Given a function that parses an Iterable[Link] from an HTMLPage, cache the
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function's result (keyed by CacheablePageContent), unless the HTMLPage
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`page` has `page.cache_link_parsing == False`.
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"""
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@_lru_cache(maxsize=None)
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def wrapper(cacheable_page):
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# type: (CacheablePageContent) -> List[Link]
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return list(fn(cacheable_page.page))
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@functools.wraps(fn)
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def wrapper_wrapper(page):
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# type: (HTMLPage) -> List[Link]
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if page.cache_link_parsing:
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return wrapper(CacheablePageContent(page))
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return list(fn(page))
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return wrapper_wrapper
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@with_cached_html_pages
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def parse_links(page):
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# type: (HTMLPage) -> Iterable[Link]
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"""
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Parse an HTML document, and yield its anchor elements as Link objects.
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"""
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document = html5lib.parse(
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page.content,
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transport_encoding=page.encoding,
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namespaceHTMLElements=False,
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)
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url = page.url
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base_url = _determine_base_url(document, url)
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for anchor in document.findall(".//a"):
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link = _create_link_from_element(
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anchor,
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page_url=url,
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base_url=base_url,
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)
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if link is None:
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continue
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yield link
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class HTMLPage(object):
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"""Represents one page, along with its URL"""
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def __init__(
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self,
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content, # type: bytes
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encoding, # type: Optional[str]
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url, # type: str
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cache_link_parsing=True, # type: bool
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):
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# type: (...) -> None
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"""
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:param encoding: the encoding to decode the given content.
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:param url: the URL from which the HTML was downloaded.
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:param cache_link_parsing: whether links parsed from this page's url
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should be cached. PyPI index urls should
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have this set to False, for example.
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"""
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self.content = content
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self.encoding = encoding
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self.url = url
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self.cache_link_parsing = cache_link_parsing
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def __str__(self):
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# type: () -> str
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return redact_auth_from_url(self.url)
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def _handle_get_page_fail(
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link, # type: Link
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reason, # type: Union[str, Exception]
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meth=None # type: Optional[Callable[..., None]]
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):
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# type: (...) -> 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 _make_html_page(response, cache_link_parsing=True):
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# type: (Response, bool) -> HTMLPage
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encoding = _get_encoding_from_headers(response.headers)
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return HTMLPage(
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response.content,
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encoding=encoding,
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url=response.url,
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cache_link_parsing=cache_link_parsing)
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def _get_html_page(link, session=None):
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# type: (Link, Optional[PipSession]) -> Optional[HTMLPage]
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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.split('#', 1)[0]
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# Check for VCS schemes that do not support lookup as web pages.
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vcs_scheme = _match_vcs_scheme(url)
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if vcs_scheme:
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logger.warning('Cannot look at %s URL %s because it does not support '
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'lookup as web pages.', vcs_scheme, link)
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return None
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# Tack index.html onto file:// URLs that point to directories
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scheme, _, path, _, _, _ = urllib_parse.urlparse(url)
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if (scheme == 'file' and 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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try:
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resp = _get_html_response(url, session=session)
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except _NotHTTP:
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logger.warning(
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'Skipping page %s because it looks like an archive, and cannot '
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'be checked by a HTTP HEAD request.', link,
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)
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except _NotHTML as exc:
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logger.warning(
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'Skipping page %s because the %s request got Content-Type: %s.'
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'The only supported Content-Type is text/html',
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link, exc.request_desc, exc.content_type,
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)
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except NetworkConnectionError as exc:
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_handle_get_page_fail(link, exc)
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except RetryError as exc:
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_handle_get_page_fail(link, exc)
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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, meth=logger.info)
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except requests.ConnectionError as exc:
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_handle_get_page_fail(link, "connection error: {}".format(exc))
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except requests.Timeout:
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_handle_get_page_fail(link, "timed out")
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else:
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return _make_html_page(resp,
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cache_link_parsing=link.cache_link_parsing)
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return None
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def _remove_duplicate_links(links):
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# type: (Iterable[Link]) -> List[Link]
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"""
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Return a list of links, with duplicates removed and ordering preserved.
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"""
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# We preserve the ordering when removing duplicates because we can.
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return list(OrderedDict.fromkeys(links))
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def group_locations(locations, expand_dir=False):
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# type: (Sequence[str], bool) -> Tuple[List[str], List[str]]
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"""
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Divide a list of locations into two groups: "files" (archives) and "urls."
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:return: 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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# type: (str) -> None
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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)
|
|
for item in os.listdir(path):
|
|
sort_path(os.path.join(path, item))
|
|
elif is_file_url:
|
|
urls.append(url)
|
|
else:
|
|
logger.warning(
|
|
"Path '%s' is ignored: it is a directory.", path,
|
|
)
|
|
elif os.path.isfile(path):
|
|
sort_path(path)
|
|
else:
|
|
logger.warning(
|
|
"Url '%s' is ignored: it is neither a file "
|
|
"nor a directory.", url,
|
|
)
|
|
elif is_url(url):
|
|
# Only add url with clear scheme
|
|
urls.append(url)
|
|
else:
|
|
logger.warning(
|
|
"Url '%s' is ignored. It is either a non-existing "
|
|
"path or lacks a specific scheme.", url,
|
|
)
|
|
|
|
return files, urls
|
|
|
|
|
|
class CollectedLinks(object):
|
|
|
|
"""
|
|
Encapsulates the return value of a call to LinkCollector.collect_links().
|
|
|
|
The return value includes both URLs to project pages containing package
|
|
links, as well as individual package Link objects collected from other
|
|
sources.
|
|
|
|
This info is stored separately as:
|
|
|
|
(1) links from the configured file locations,
|
|
(2) links from the configured find_links, and
|
|
(3) urls to HTML project pages, as described by the PEP 503 simple
|
|
repository API.
|
|
"""
|
|
|
|
def __init__(
|
|
self,
|
|
files, # type: List[Link]
|
|
find_links, # type: List[Link]
|
|
project_urls, # type: List[Link]
|
|
):
|
|
# type: (...) -> None
|
|
"""
|
|
:param files: Links from file locations.
|
|
:param find_links: Links from find_links.
|
|
:param project_urls: URLs to HTML project pages, as described by
|
|
the PEP 503 simple repository API.
|
|
"""
|
|
self.files = files
|
|
self.find_links = find_links
|
|
self.project_urls = project_urls
|
|
|
|
|
|
class LinkCollector(object):
|
|
|
|
"""
|
|
Responsible for collecting Link objects from all configured locations,
|
|
making network requests as needed.
|
|
|
|
The class's main method is its collect_links() method.
|
|
"""
|
|
|
|
def __init__(
|
|
self,
|
|
session, # type: PipSession
|
|
search_scope, # type: SearchScope
|
|
):
|
|
# type: (...) -> None
|
|
self.search_scope = search_scope
|
|
self.session = session
|
|
|
|
@classmethod
|
|
def create(cls, session, options, suppress_no_index=False):
|
|
# type: (PipSession, Values, bool) -> LinkCollector
|
|
"""
|
|
:param session: The Session to use to make requests.
|
|
:param suppress_no_index: Whether to ignore the --no-index option
|
|
when constructing the SearchScope object.
|
|
"""
|
|
index_urls = [options.index_url] + options.extra_index_urls
|
|
if options.no_index and not suppress_no_index:
|
|
logger.debug(
|
|
'Ignoring indexes: %s',
|
|
','.join(redact_auth_from_url(url) for url in index_urls),
|
|
)
|
|
index_urls = []
|
|
|
|
# Make sure find_links is a list before passing to create().
|
|
find_links = options.find_links or []
|
|
|
|
search_scope = SearchScope.create(
|
|
find_links=find_links, index_urls=index_urls,
|
|
)
|
|
link_collector = LinkCollector(
|
|
session=session, search_scope=search_scope,
|
|
)
|
|
return link_collector
|
|
|
|
@property
|
|
def find_links(self):
|
|
# type: () -> List[str]
|
|
return self.search_scope.find_links
|
|
|
|
def fetch_page(self, location):
|
|
# type: (Link) -> Optional[HTMLPage]
|
|
"""
|
|
Fetch an HTML page containing package links.
|
|
"""
|
|
return _get_html_page(location, session=self.session)
|
|
|
|
def collect_links(self, project_name):
|
|
# type: (str) -> CollectedLinks
|
|
"""Find all available links for the given project name.
|
|
|
|
:return: All the Link objects (unfiltered), as a CollectedLinks object.
|
|
"""
|
|
search_scope = self.search_scope
|
|
index_locations = search_scope.get_index_urls_locations(project_name)
|
|
index_file_loc, index_url_loc = group_locations(index_locations)
|
|
fl_file_loc, fl_url_loc = group_locations(
|
|
self.find_links, expand_dir=True,
|
|
)
|
|
|
|
file_links = [
|
|
Link(url) for url in itertools.chain(index_file_loc, fl_file_loc)
|
|
]
|
|
|
|
# We trust every directly linked archive in find_links
|
|
find_link_links = [Link(url, '-f') for url in self.find_links]
|
|
|
|
# We trust every url that the user has given us whether it was given
|
|
# via --index-url or --find-links.
|
|
# We want to filter out anything that does not have a secure origin.
|
|
url_locations = [
|
|
link for link in itertools.chain(
|
|
# Mark PyPI indices as "cache_link_parsing == False" -- this
|
|
# will avoid caching the result of parsing the page for links.
|
|
(Link(url, cache_link_parsing=False) for url in index_url_loc),
|
|
(Link(url) for url in fl_url_loc),
|
|
)
|
|
if self.session.is_secure_origin(link)
|
|
]
|
|
|
|
url_locations = _remove_duplicate_links(url_locations)
|
|
lines = [
|
|
'{} location(s) to search for versions of {}:'.format(
|
|
len(url_locations), project_name,
|
|
),
|
|
]
|
|
for link in url_locations:
|
|
lines.append('* {}'.format(link))
|
|
logger.debug('\n'.join(lines))
|
|
|
|
return CollectedLinks(
|
|
files=file_links,
|
|
find_links=find_link_links,
|
|
project_urls=url_locations,
|
|
)
|