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"""
The main purpose of this module is to expose LinkCollector.collect_links().
"""
import cgi
import functools
import itertools
import logging
import mimetypes
import os
import re
from collections import OrderedDict
from pip._vendor import html5lib, requests
from pip._vendor.distlib.compat import unescape
from pip._vendor.requests.exceptions import RetryError, SSLError
from pip._vendor.six.moves.urllib import parse as urllib_parse
from pip._vendor.six.moves.urllib import request as urllib_request
from pip._internal.exceptions import NetworkConnectionError
from pip._internal.models.link import Link
from pip._internal.models.search_scope import SearchScope
from pip._internal.network.utils import raise_for_status
from pip._internal.utils.compat import lru_cache
from pip._internal.utils.filetypes import ARCHIVE_EXTENSIONS
from pip._internal.utils.misc import pairwise, redact_auth_from_url
from pip._internal.utils.typing import MYPY_CHECK_RUNNING
from pip._internal.utils.urls import path_to_url, url_to_path
from pip._internal.vcs import is_url, vcs
if MYPY_CHECK_RUNNING:
from optparse import Values
from typing import (
Callable,
Iterable,
List,
MutableMapping,
Optional,
Sequence,
Tuple,
Union,
)
import xml.etree.ElementTree
from pip._vendor.requests import Response
from pip._internal.network.session import PipSession
HTMLElement = xml.etree.ElementTree.Element
ResponseHeaders = MutableMapping[str, str]
logger = logging.getLogger(__name__)
def _match_vcs_scheme(url):
# type: (str) -> Optional[str]
"""Look for VCS schemes in the URL.
Returns the matched VCS scheme, or None if there's no match.
"""
for scheme in vcs.schemes:
if url.lower().startswith(scheme) and url[len(scheme)] in '+:':
return scheme
return None
def _is_url_like_archive(url):
# type: (str) -> bool
"""Return whether the URL looks like an archive.
"""
filename = Link(url).filename
for bad_ext in ARCHIVE_EXTENSIONS:
if filename.endswith(bad_ext):
return True
return False
class _NotHTML(Exception):
def __init__(self, content_type, request_desc):
# type: (str, str) -> None
super(_NotHTML, self).__init__(content_type, request_desc)
self.content_type = content_type
self.request_desc = request_desc
def _ensure_html_header(response):
# type: (Response) -> None
"""Check the Content-Type header to ensure the response contains HTML.
Raises `_NotHTML` if the content type is not text/html.
"""
content_type = response.headers.get("Content-Type", "")
if not content_type.lower().startswith("text/html"):
raise _NotHTML(content_type, response.request.method)
class _NotHTTP(Exception):
pass
def _ensure_html_response(url, session):
# type: (str, PipSession) -> None
"""Send a HEAD request to the URL, and ensure the response contains HTML.
Raises `_NotHTTP` if the URL is not available for a HEAD request, or
`_NotHTML` if the content type is not text/html.
"""
scheme, netloc, path, query, fragment = urllib_parse.urlsplit(url)
if scheme not in {'http', 'https'}:
raise _NotHTTP()
resp = session.head(url, allow_redirects=True)
raise_for_status(resp)
_ensure_html_header(resp)
def _get_html_response(url, session):
# type: (str, PipSession) -> Response
"""Access an HTML page with GET, and return the response.
This consists of three parts:
1. If the URL looks suspiciously like an archive, send a HEAD first to
check the Content-Type is HTML, to avoid downloading a large file.
Raise `_NotHTTP` if the content type cannot be determined, or
`_NotHTML` if it is not HTML.
2. Actually perform the request. Raise HTTP exceptions on network failures.
3. Check the Content-Type header to make sure we got HTML, and raise
`_NotHTML` otherwise.
"""
if _is_url_like_archive(url):
_ensure_html_response(url, session=session)
logger.debug('Getting page %s', redact_auth_from_url(url))
resp = session.get(
url,
headers={
"Accept": "text/html",
# We don't want to blindly returned cached data for
# /simple/, because authors generally expecting that
# twine upload && pip install will function, but if
# they've done a pip install in the last ~10 minutes
# it won't. Thus by setting this to zero we will not
# blindly use any cached data, however the benefit of
# using max-age=0 instead of no-cache, is that we will
# still support conditional requests, so we will still
# minimize traffic sent in cases where the page hasn't
# changed at all, we will just always incur the round
# trip for the conditional GET now instead of only
# once per 10 minutes.
# For more information, please see pypa/pip#5670.
"Cache-Control": "max-age=0",
},
)
raise_for_status(resp)
# The check for archives above only works if the url ends with
# something that looks like an archive. However that is not a
# requirement of an url. Unless we issue a HEAD request on every
# url we cannot know ahead of time for sure if something is HTML
# or not. However we can check after we've downloaded it.
_ensure_html_header(resp)
return resp
def _get_encoding_from_headers(headers):
# type: (ResponseHeaders) -> Optional[str]
"""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
def _determine_base_url(document, page_url):
# type: (HTMLElement, str) -> str
"""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 _clean_url_path_part(part):
# type: (str) -> str
"""
Clean a "part" of a URL path (i.e. after splitting on "@" characters).
"""
# We unquote prior to quoting to make sure nothing is double quoted.
return urllib_parse.quote(urllib_parse.unquote(part))
def _clean_file_url_path(part):
# type: (str) -> str
"""
Clean the first part of a URL path that corresponds to a local
filesystem path (i.e. the first part after splitting on "@" characters).
"""
# We unquote prior to quoting to make sure nothing is double quoted.
# Also, on Windows the path part might contain a drive letter which
# should not be quoted. On Linux where drive letters do not
# exist, the colon should be quoted. We rely on urllib.request
# to do the right thing here.
return urllib_request.pathname2url(urllib_request.url2pathname(part))
# percent-encoded: /
_reserved_chars_re = re.compile('(@|%2F)', re.IGNORECASE)
def _clean_url_path(path, is_local_path):
# type: (str, bool) -> str
"""
Clean the path portion of a URL.
"""
if is_local_path:
clean_func = _clean_file_url_path
else:
clean_func = _clean_url_path_part
# Split on the reserved characters prior to cleaning so that
# revision strings in VCS URLs are properly preserved.
parts = _reserved_chars_re.split(path)
cleaned_parts = []
for to_clean, reserved in pairwise(itertools.chain(parts, [''])):
cleaned_parts.append(clean_func(to_clean))
# Normalize %xx escapes (e.g. %2f -> %2F)
cleaned_parts.append(reserved.upper())
return ''.join(cleaned_parts)
def _clean_link(url):
# type: (str) -> str
"""
Make sure a link is fully quoted.
For example, if ' ' occurs in the URL, it will be replaced with "%20",
and without double-quoting other characters.
"""
# Split the URL into parts according to the general structure
# `scheme://netloc/path;parameters?query#fragment`.
result = urllib_parse.urlparse(url)
# If the netloc is empty, then the URL refers to a local filesystem path.
is_local_path = not result.netloc
path = _clean_url_path(result.path, is_local_path=is_local_path)
return urllib_parse.urlunparse(result._replace(path=path))
def _create_link_from_element(
anchor, # type: HTMLElement
page_url, # type: str
base_url, # type: str
):
# type: (...) -> Optional[Link]
"""
Convert an anchor element in a simple repository page to a Link.
"""
href = anchor.get("href")
if not href:
return None
url = _clean_link(urllib_parse.urljoin(base_url, href))
pyrequire = anchor.get('data-requires-python')
pyrequire = unescape(pyrequire) if pyrequire else None
yanked_reason = anchor.get('data-yanked')
if yanked_reason:
# This is a unicode string in Python 2 (and 3).
yanked_reason = unescape(yanked_reason)
link = Link(
url,
comes_from=page_url,
requires_python=pyrequire,
yanked_reason=yanked_reason,
)
return link
class CacheablePageContent(object):
def __init__(self, page):
# type: (HTMLPage) -> None
assert page.cache_link_parsing
self.page = page
def __eq__(self, other):
# type: (object) -> bool
return (isinstance(other, type(self)) and
self.page.url == other.page.url)
def __hash__(self):
# type: () -> int
return hash(self.page.url)
def with_cached_html_pages(
fn, # type: Callable[[HTMLPage], Iterable[Link]]
):
# type: (...) -> Callable[[HTMLPage], List[Link]]
"""
Given a function that parses an Iterable[Link] from an HTMLPage, cache the
function's result (keyed by CacheablePageContent), unless the HTMLPage
`page` has `page.cache_link_parsing == False`.
"""
@lru_cache(maxsize=None)
def wrapper(cacheable_page):
# type: (CacheablePageContent) -> List[Link]
return list(fn(cacheable_page.page))
@functools.wraps(fn)
def wrapper_wrapper(page):
# type: (HTMLPage) -> List[Link]
if page.cache_link_parsing:
return wrapper(CacheablePageContent(page))
return list(fn(page))
return wrapper_wrapper
@with_cached_html_pages
def parse_links(page):
# type: (HTMLPage) -> Iterable[Link]
"""
Parse an HTML document, and yield its anchor elements as Link objects.
"""
document = html5lib.parse(
page.content,
transport_encoding=page.encoding,
namespaceHTMLElements=False,
)
url = page.url
base_url = _determine_base_url(document, url)
for anchor in document.findall(".//a"):
link = _create_link_from_element(
anchor,
page_url=url,
base_url=base_url,
)
if link is None:
continue
yield link
class HTMLPage(object):
"""Represents one page, along with its URL"""
def __init__(
self,
content, # type: bytes
encoding, # type: Optional[str]
url, # type: str
cache_link_parsing=True, # type: bool
):
# type: (...) -> None
"""
:param encoding: the encoding to decode the given content.
:param url: the URL from which the HTML was downloaded.
:param cache_link_parsing: whether links parsed from this page's url
should be cached. PyPI index urls should
have this set to False, for example.
"""
self.content = content
self.encoding = encoding
self.url = url
self.cache_link_parsing = cache_link_parsing
def __str__(self):
# type: () -> str
return redact_auth_from_url(self.url)
def _handle_get_page_fail(
link, # type: Link
reason, # type: Union[str, Exception]
meth=None # type: Optional[Callable[..., None]]
):
# type: (...) -> None
if meth is None:
meth = logger.debug
meth("Could not fetch URL %s: %s - skipping", link, reason)
def _make_html_page(response, cache_link_parsing=True):
# type: (Response, bool) -> HTMLPage
encoding = _get_encoding_from_headers(response.headers)
return HTMLPage(
response.content,
encoding=encoding,
url=response.url,
cache_link_parsing=cache_link_parsing)
def _get_html_page(link, session=None):
# type: (Link, Optional[PipSession]) -> Optional[HTMLPage]
if session is None:
raise TypeError(
"_get_html_page() missing 1 required keyword argument: 'session'"
)
url = link.url.split('#', 1)[0]
# Check for VCS schemes that do not support lookup as web pages.
vcs_scheme = _match_vcs_scheme(url)
if vcs_scheme:
logger.warning('Cannot look at %s URL %s because it does not support '
'lookup as web pages.', vcs_scheme, link)
return None
# Tack index.html onto file:// URLs that point to directories
scheme, _, path, _, _, _ = urllib_parse.urlparse(url)
if (scheme == 'file' and os.path.isdir(urllib_request.url2pathname(path))):
# add trailing slash if not present so urljoin doesn't trim
# final segment
if not url.endswith('/'):
url += '/'
url = urllib_parse.urljoin(url, 'index.html')
logger.debug(' file: URL is directory, getting %s', url)
try:
resp = _get_html_response(url, session=session)
except _NotHTTP:
logger.warning(
'Skipping page %s because it looks like an archive, and cannot '
'be checked by a HTTP HEAD request.', link,
)
except _NotHTML as exc:
logger.warning(
'Skipping page %s because the %s request got Content-Type: %s.'
'The only supported Content-Type is text/html',
link, exc.request_desc, exc.content_type,
)
except NetworkConnectionError as exc:
_handle_get_page_fail(link, exc)
except RetryError as exc:
_handle_get_page_fail(link, exc)
except SSLError as exc:
reason = "There was a problem confirming the ssl certificate: "
reason += str(exc)
_handle_get_page_fail(link, reason, meth=logger.info)
except requests.ConnectionError as exc:
_handle_get_page_fail(link, "connection error: {}".format(exc))
except requests.Timeout:
_handle_get_page_fail(link, "timed out")
else:
return _make_html_page(resp,
cache_link_parsing=link.cache_link_parsing)
return None
def _remove_duplicate_links(links):
# type: (Iterable[Link]) -> List[Link]
"""
Return a list of links, with duplicates removed and ordering preserved.
"""
# We preserve the ordering when removing duplicates because we can.
return list(OrderedDict.fromkeys(links))
def group_locations(locations, expand_dir=False):
# type: (Sequence[str], bool) -> Tuple[List[str], List[str]]
"""
Divide a list of locations into two groups: "files" (archives) and "urls."
:return: A pair of lists (files, urls).
"""
files = []
urls = []
# puts the url for the given file path into the appropriate list
def sort_path(path):
# type: (str) -> None
url = path_to_url(path)
if mimetypes.guess_type(url, strict=False)[0] == 'text/html':
urls.append(url)
else:
files.append(url)
for url in locations:
is_local_path = os.path.exists(url)
is_file_url = url.startswith('file:')
if is_local_path or is_file_url:
if is_local_path:
path = url
else:
path = url_to_path(url)
if os.path.isdir(path):
if expand_dir:
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,
)