"""Routines related to PyPI, indexes""" from __future__ import absolute_import import cgi import itertools import logging import mimetypes import os import re from pip._vendor import html5lib, requests, six from pip._vendor.distlib.compat import unescape from pip._vendor.packaging import specifiers from pip._vendor.packaging.utils import canonicalize_name from pip._vendor.packaging.version import parse as parse_version from pip._vendor.requests.exceptions import HTTPError, 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.download import is_url, url_to_path from pip._internal.exceptions import ( BestVersionAlreadyInstalled, DistributionNotFound, InvalidWheelFilename, UnsupportedWheel, ) from pip._internal.models.candidate import InstallationCandidate from pip._internal.models.format_control import FormatControl from pip._internal.models.link import Link from pip._internal.models.selection_prefs import SelectionPreferences from pip._internal.models.target_python import TargetPython from pip._internal.utils.compat import ipaddress from pip._internal.utils.logging import indent_log from pip._internal.utils.misc import ( ARCHIVE_EXTENSIONS, SUPPORTED_EXTENSIONS, WHEEL_EXTENSION, path_to_url, redact_password_from_url, ) from pip._internal.utils.packaging import check_requires_python from pip._internal.utils.typing import MYPY_CHECK_RUNNING from pip._internal.wheel import Wheel if MYPY_CHECK_RUNNING: from logging import Logger from typing import ( Any, Callable, FrozenSet, Iterable, Iterator, List, MutableMapping, Optional, Sequence, Set, Text, Tuple, Union, ) import xml.etree.ElementTree from pip._vendor.packaging.version import _BaseVersion from pip._vendor.requests import Response from pip._internal.models.search_scope import SearchScope from pip._internal.req import InstallRequirement from pip._internal.download import PipSession from pip._internal.pep425tags import Pep425Tag from pip._internal.utils.hashes import Hashes BuildTag = Tuple[Any, ...] # either empty tuple or Tuple[int, str] CandidateSortingKey = ( Tuple[int, int, int, _BaseVersion, BuildTag, Optional[int]] ) HTMLElement = xml.etree.ElementTree.Element SecureOrigin = Tuple[str, str, Optional[str]] __all__ = ['FormatControl', 'FoundCandidates', 'PackageFinder'] SECURE_ORIGINS = [ # protocol, hostname, port # Taken from Chrome's list of secure origins (See: http://bit.ly/1qrySKC) ("https", "*", "*"), ("*", "localhost", "*"), ("*", "127.0.0.0/8", "*"), ("*", "::1/128", "*"), ("file", "*", None), # ssh is always secure. ("ssh", "*", "*"), ] # type: List[SecureOrigin] 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. """ from pip._internal.vcs import vcs 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) resp.raise_for_status() _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_password_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", }, ) resp.raise_for_status() # 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 _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 _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.debug('Cannot look at %s URL %s', 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.debug( 'Skipping page %s because it looks like an archive, and cannot ' 'be checked by HEAD.', link, ) except _NotHTML as exc: logger.debug( 'Skipping page %s because the %s request got Content-Type: %s', link, exc.request_desc, exc.content_type, ) except HTTPError 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: %s" % exc) except requests.Timeout: _handle_get_page_fail(link, "timed out") else: return HTMLPage(resp.content, resp.url, resp.headers) return None def _check_link_requires_python( link, # type: Link version_info, # type: Tuple[int, int, int] ignore_requires_python=False, # type: bool ): # type: (...) -> bool """ Return whether the given Python version is compatible with a link's "Requires-Python" value. :param version_info: A 3-tuple of ints representing the Python major-minor-micro version to check. :param ignore_requires_python: Whether to ignore the "Requires-Python" value if the given Python version isn't compatible. """ try: is_compatible = check_requires_python( link.requires_python, version_info=version_info, ) except specifiers.InvalidSpecifier: logger.debug( "Ignoring invalid Requires-Python (%r) for link: %s", link.requires_python, link, ) else: if not is_compatible: version = '.'.join(map(str, version_info)) if not ignore_requires_python: logger.debug( 'Link requires a different Python (%s not in: %r): %s', version, link.requires_python, link, ) return False logger.debug( 'Ignoring failed Requires-Python check (%s not in: %r) ' 'for link: %s', version, link.requires_python, link, ) return True class LinkEvaluator(object): """ Responsible for evaluating links for a particular project. """ _py_version_re = re.compile(r'-py([123]\.?[0-9]?)$') # Don't include an allow_yanked default value to make sure each call # site considers whether yanked releases are allowed. This also causes # that decision to be made explicit in the calling code, which helps # people when reading the code. def __init__( self, project_name, # type: str canonical_name, # type: str formats, # type: FrozenSet target_python, # type: TargetPython allow_yanked, # type: bool ignore_requires_python=None, # type: Optional[bool] ): # type: (...) -> None """ :param project_name: The user supplied package name. :param canonical_name: The canonical package name. :param formats: The formats allowed for this package. Should be a set with 'binary' or 'source' or both in it. :param target_python: The target Python interpreter to use when evaluating link compatibility. This is used, for example, to check wheel compatibility, as well as when checking the Python version, e.g. the Python version embedded in a link filename (or egg fragment) and against an HTML link's optional PEP 503 "data-requires-python" attribute. :param allow_yanked: Whether files marked as yanked (in the sense of PEP 592) are permitted to be candidates for install. :param ignore_requires_python: Whether to ignore incompatible PEP 503 "data-requires-python" values in HTML links. Defaults to False. """ if ignore_requires_python is None: ignore_requires_python = False self._allow_yanked = allow_yanked self._canonical_name = canonical_name self._ignore_requires_python = ignore_requires_python self._formats = formats self._target_python = target_python self.project_name = project_name def evaluate_link(self, link): # type: (Link) -> Tuple[bool, Optional[Text]] """ Determine whether a link is a candidate for installation. :return: A tuple (is_candidate, result), where `result` is (1) a version string if `is_candidate` is True, and (2) if `is_candidate` is False, an optional string to log the reason the link fails to qualify. """ version = None if link.is_yanked and not self._allow_yanked: reason = link.yanked_reason or '' # Mark this as a unicode string to prevent "UnicodeEncodeError: # 'ascii' codec can't encode character" in Python 2 when # the reason contains non-ascii characters. return (False, u'yanked for reason: {}'.format(reason)) if link.egg_fragment: egg_info = link.egg_fragment ext = link.ext else: egg_info, ext = link.splitext() if not ext: return (False, 'not a file') if ext not in SUPPORTED_EXTENSIONS: return (False, 'unsupported archive format: %s' % ext) if "binary" not in self._formats and ext == WHEEL_EXTENSION: reason = 'No binaries permitted for %s' % self.project_name return (False, reason) if "macosx10" in link.path and ext == '.zip': return (False, 'macosx10 one') if ext == WHEEL_EXTENSION: try: wheel = Wheel(link.filename) except InvalidWheelFilename: return (False, 'invalid wheel filename') if canonicalize_name(wheel.name) != self._canonical_name: reason = 'wrong project name (not %s)' % self.project_name return (False, reason) supported_tags = self._target_python.get_tags() if not wheel.supported(supported_tags): # Include the wheel's tags in the reason string to # simplify troubleshooting compatibility issues. file_tags = wheel.get_formatted_file_tags() reason = ( "none of the wheel's tags match: {}".format( ', '.join(file_tags) ) ) return (False, reason) version = wheel.version # This should be up by the self.ok_binary check, but see issue 2700. if "source" not in self._formats and ext != WHEEL_EXTENSION: return (False, 'No sources permitted for %s' % self.project_name) if not version: version = _extract_version_from_fragment( egg_info, self._canonical_name, ) if not version: return ( False, 'Missing project version for %s' % self.project_name, ) match = self._py_version_re.search(version) if match: version = version[:match.start()] py_version = match.group(1) if py_version != self._target_python.py_version: return (False, 'Python version is incorrect') supports_python = _check_link_requires_python( link, version_info=self._target_python.py_version_info, ignore_requires_python=self._ignore_requires_python, ) if not supports_python: # Return None for the reason text to suppress calling # _log_skipped_link(). return (False, None) logger.debug('Found link %s, version: %s', link, version) return (True, version) def filter_unallowed_hashes( candidates, # type: List[InstallationCandidate] hashes, # type: Hashes project_name, # type: str ): # type: (...) -> List[InstallationCandidate] """ Filter out candidates whose hashes aren't allowed, and return a new list of candidates. If at least one candidate has an allowed hash, then all candidates with either an allowed hash or no hash specified are returned. Otherwise, the given candidates are returned. Including the candidates with no hash specified when there is a match allows a warning to be logged if there is a more preferred candidate with no hash specified. Returning all candidates in the case of no matches lets pip report the hash of the candidate that would otherwise have been installed (e.g. permitting the user to more easily update their requirements file with the desired hash). """ if not hashes: logger.debug( 'Given no hashes to check %s links for project %r: ' 'discarding no candidates', len(candidates), project_name, ) # Make sure we're not returning back the given value. return list(candidates) matches_or_no_digest = [] # Collect the non-matches for logging purposes. non_matches = [] match_count = 0 for candidate in candidates: link = candidate.link if not link.has_hash: pass elif link.is_hash_allowed(hashes=hashes): match_count += 1 else: non_matches.append(candidate) continue matches_or_no_digest.append(candidate) if match_count: filtered = matches_or_no_digest else: # Make sure we're not returning back the given value. filtered = list(candidates) if len(filtered) == len(candidates): discard_message = 'discarding no candidates' else: discard_message = 'discarding {} non-matches:\n {}'.format( len(non_matches), '\n '.join(str(candidate.link) for candidate in non_matches) ) logger.debug( 'Checked %s links for project %r against %s hashes ' '(%s matches, %s no digest): %s', len(candidates), project_name, hashes.digest_count, match_count, len(matches_or_no_digest) - match_count, discard_message ) return filtered class CandidatePreferences(object): """ Encapsulates some of the preferences for filtering and sorting InstallationCandidate objects. """ def __init__( self, prefer_binary=False, # type: bool allow_all_prereleases=False, # type: bool ): # type: (...) -> None """ :param allow_all_prereleases: Whether to allow all pre-releases. """ self.allow_all_prereleases = allow_all_prereleases self.prefer_binary = prefer_binary class CandidateEvaluator(object): """ Responsible for filtering and sorting candidates for installation based on what tags are valid. """ @classmethod def create( cls, project_name, # type: str target_python=None, # type: Optional[TargetPython] prefer_binary=False, # type: bool allow_all_prereleases=False, # type: bool specifier=None, # type: Optional[specifiers.BaseSpecifier] hashes=None, # type: Optional[Hashes] ): # type: (...) -> CandidateEvaluator """Create a CandidateEvaluator object. :param target_python: The target Python interpreter to use when checking compatibility. If None (the default), a TargetPython object will be constructed from the running Python. :param hashes: An optional collection of allowed hashes. """ if target_python is None: target_python = TargetPython() if specifier is None: specifier = specifiers.SpecifierSet() supported_tags = target_python.get_tags() return cls( project_name=project_name, supported_tags=supported_tags, specifier=specifier, prefer_binary=prefer_binary, allow_all_prereleases=allow_all_prereleases, hashes=hashes, ) def __init__( self, project_name, # type: str supported_tags, # type: List[Pep425Tag] specifier, # type: specifiers.BaseSpecifier prefer_binary=False, # type: bool allow_all_prereleases=False, # type: bool hashes=None, # type: Optional[Hashes] ): # type: (...) -> None """ :param supported_tags: The PEP 425 tags supported by the target Python in order of preference (most preferred first). """ self._allow_all_prereleases = allow_all_prereleases self._hashes = hashes self._prefer_binary = prefer_binary self._project_name = project_name self._specifier = specifier self._supported_tags = supported_tags def get_applicable_candidates( self, candidates, # type: List[InstallationCandidate] ): # type: (...) -> List[InstallationCandidate] """ Return the applicable candidates from a list of candidates. """ # Using None infers from the specifier instead. allow_prereleases = self._allow_all_prereleases or None specifier = self._specifier versions = { str(v) for v in 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 candidates), prereleases=allow_prereleases, ) } # Again, converting version to str to deal with debundling. applicable_candidates = [ c for c in candidates if str(c.version) in versions ] return filter_unallowed_hashes( candidates=applicable_candidates, hashes=self._hashes, project_name=self._project_name, ) def make_found_candidates( self, candidates, # type: List[InstallationCandidate] ): # type: (...) -> FoundCandidates """ Create and return a `FoundCandidates` instance. :param specifier: An optional object implementing `filter` (e.g. `packaging.specifiers.SpecifierSet`) to filter applicable versions. """ applicable_candidates = self.get_applicable_candidates(candidates) return FoundCandidates( candidates, applicable_candidates=applicable_candidates, evaluator=self, ) def _sort_key(self, candidate): # type: (InstallationCandidate) -> CandidateSortingKey """ Function to pass as the `key` argument to a call to sorted() to sort InstallationCandidates by preference. Returns a tuple such that tuples sorting as greater using Python's default comparison operator are more preferred. The preference is as follows: First and foremost, candidates with allowed (matching) hashes are always preferred over candidates without matching hashes. This is because e.g. if the only candidate with an allowed hash is yanked, we still want to use that candidate. Second, excepting hash considerations, candidates that have been yanked (in the sense of PEP 592) are always less preferred than candidates that haven't been yanked. Then: If not finding wheels, they are sorted by version only. If finding wheels, then the sort order is by version, then: 1. existing installs 2. wheels ordered via Wheel.support_index_min(self._supported_tags) 3. source archives If prefer_binary was set, then all wheels are sorted above sources. Note: it was considered to embed this logic into the Link comparison operators, but then different sdist links with the same version, would have to be considered equal """ valid_tags = self._supported_tags support_num = len(valid_tags) build_tag = tuple() # type: BuildTag binary_preference = 0 link = candidate.link if link.is_wheel: # can raise InvalidWheelFilename wheel = Wheel(link.filename) if not wheel.supported(valid_tags): raise UnsupportedWheel( "%s is not a supported wheel for this platform. It " "can't be sorted." % wheel.filename ) if self._prefer_binary: binary_preference = 1 pri = -(wheel.support_index_min(valid_tags)) if wheel.build_tag is not None: match = re.match(r'^(\d+)(.*)$', wheel.build_tag) build_tag_groups = match.groups() build_tag = (int(build_tag_groups[0]), build_tag_groups[1]) else: # sdist pri = -(support_num) has_allowed_hash = int(link.is_hash_allowed(self._hashes)) yank_value = -1 * int(link.is_yanked) # -1 for yanked. return ( has_allowed_hash, yank_value, binary_preference, candidate.version, build_tag, pri, ) def get_best_candidate( self, candidates, # type: List[InstallationCandidate] ): # type: (...) -> Optional[InstallationCandidate] """ Return the best candidate per the instance's sort order, or None if no candidate is acceptable. """ if not candidates: return None best_candidate = max(candidates, key=self._sort_key) # Log a warning per PEP 592 if necessary before returning. link = best_candidate.link if link.is_yanked: reason = link.yanked_reason or '' msg = ( # Mark this as a unicode string to prevent # "UnicodeEncodeError: 'ascii' codec can't encode character" # in Python 2 when the reason contains non-ascii characters. u'The candidate selected for download or install is a ' 'yanked version: {candidate}\n' 'Reason for being yanked: {reason}' ).format(candidate=best_candidate, reason=reason) logger.warning(msg) return best_candidate class FoundCandidates(object): """A collection of candidates, returned by `PackageFinder.find_candidates`. This class is only intended to be instantiated by CandidateEvaluator's `make_found_candidates()` method. """ def __init__( self, candidates, # type: List[InstallationCandidate] applicable_candidates, # type: List[InstallationCandidate] evaluator, # type: CandidateEvaluator ): # type: (...) -> None """ :param candidates: A sequence of all available candidates found. :param applicable_candidates: The applicable candidates. :param evaluator: A CandidateEvaluator object to sort applicable candidates by order of preference. """ self._applicable_candidates = applicable_candidates self._candidates = candidates self._evaluator = evaluator def iter_all(self): # type: () -> Iterable[InstallationCandidate] """Iterate through all candidates. """ return iter(self._candidates) def iter_applicable(self): # type: () -> Iterable[InstallationCandidate] """Iterate through the applicable candidates. """ return iter(self._applicable_candidates) def get_best(self): # type: () -> Optional[InstallationCandidate] """Return the best candidate available, or None if no applicable candidates are found. """ candidates = list(self.iter_applicable()) return self._evaluator.get_best_candidate(candidates) class PackageFinder(object): """This finds packages. This is meant to match easy_install's technique for looking for packages, by reading pages and looking for appropriate links. """ def __init__( self, search_scope, # type: SearchScope session, # type: PipSession target_python, # type: TargetPython allow_yanked, # type: bool format_control=None, # type: Optional[FormatControl] trusted_hosts=None, # type: Optional[List[str]] candidate_prefs=None, # type: CandidatePreferences ignore_requires_python=None, # type: Optional[bool] ): # type: (...) -> None """ This constructor is primarily meant to be used by the create() class method and from tests. :param session: The Session to use to make requests. :param format_control: A FormatControl object, used to control the selection of source packages / binary packages when consulting the index and links. :param candidate_prefs: Options to use when creating a CandidateEvaluator object. """ if trusted_hosts is None: trusted_hosts = [] if candidate_prefs is None: candidate_prefs = CandidatePreferences() format_control = format_control or FormatControl(set(), set()) self._allow_yanked = allow_yanked self._candidate_prefs = candidate_prefs self._ignore_requires_python = ignore_requires_python self._target_python = target_python self.search_scope = search_scope self.session = session self.format_control = format_control self.trusted_hosts = trusted_hosts # These are boring links that have already been logged somehow. self._logged_links = set() # type: Set[Link] # Don't include an allow_yanked default value to make sure each call # site considers whether yanked releases are allowed. This also causes # that decision to be made explicit in the calling code, which helps # people when reading the code. @classmethod def create( cls, search_scope, # type: SearchScope selection_prefs, # type: SelectionPreferences trusted_hosts=None, # type: Optional[List[str]] session=None, # type: Optional[PipSession] target_python=None, # type: Optional[TargetPython] ): # type: (...) -> PackageFinder """Create a PackageFinder. :param selection_prefs: The candidate selection preferences, as a SelectionPreferences object. :param trusted_hosts: Domains not to emit warnings for when not using HTTPS. :param session: The Session to use to make requests. :param target_python: The target Python interpreter to use when checking compatibility. If None (the default), a TargetPython object will be constructed from the running Python. """ if session is None: raise TypeError( "PackageFinder.create() missing 1 required keyword argument: " "'session'" ) if target_python is None: target_python = TargetPython() candidate_prefs = CandidatePreferences( prefer_binary=selection_prefs.prefer_binary, allow_all_prereleases=selection_prefs.allow_all_prereleases, ) return cls( candidate_prefs=candidate_prefs, search_scope=search_scope, session=session, target_python=target_python, allow_yanked=selection_prefs.allow_yanked, format_control=selection_prefs.format_control, trusted_hosts=trusted_hosts, ignore_requires_python=selection_prefs.ignore_requires_python, ) @property def find_links(self): # type: () -> List[str] return self.search_scope.find_links @property def index_urls(self): # type: () -> List[str] return self.search_scope.index_urls @property def allow_all_prereleases(self): # type: () -> bool return self._candidate_prefs.allow_all_prereleases def set_allow_all_prereleases(self): # type: () -> None self._candidate_prefs.allow_all_prereleases = True def add_trusted_host(self, host, source=None): # type: (str, Optional[str]) -> None """ :param source: An optional source string, for logging where the host string came from. """ # It is okay to add a previously added host because PipSession stores # the resulting prefixes in a dict. msg = 'adding trusted host: {!r}'.format(host) if source is not None: msg += ' (from {})'.format(source) logger.info(msg) self.session.add_insecure_host(host) if host in self.trusted_hosts: return self.trusted_hosts.append(host) def iter_secure_origins(self): # type: () -> Iterator[SecureOrigin] for secure_origin in SECURE_ORIGINS: yield secure_origin for host in self.trusted_hosts: yield ('*', host, '*') @staticmethod def _sort_locations(locations, expand_dir=False): # type: (Sequence[str], bool) -> Tuple[List[str], List[str]] """ Sort locations into "files" (archives) and "urls", and 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): 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 '{0}' is ignored: " "it is a directory.".format(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 def _validate_secure_origin(self, logger, location): # type: (Logger, Link) -> bool # Determine if this url used a secure transport mechanism parsed = urllib_parse.urlparse(str(location)) origin = (parsed.scheme, parsed.hostname, parsed.port) # The protocol to use to see if the protocol matches. # Don't count the repository type as part of the protocol: in # cases such as "git+ssh", only use "ssh". (I.e., Only verify against # the last scheme.) protocol = origin[0].rsplit('+', 1)[-1] # Determine if our origin is a secure origin by looking through our # hardcoded list of secure origins, as well as any additional ones # configured on this PackageFinder instance. for secure_origin in self.iter_secure_origins(): if protocol != secure_origin[0] and secure_origin[0] != "*": continue try: # We need to do this decode dance to ensure that we have a # unicode object, even on Python 2.x. addr = ipaddress.ip_address( origin[1] if ( isinstance(origin[1], six.text_type) or origin[1] is None ) else origin[1].decode("utf8") ) network = ipaddress.ip_network( secure_origin[1] if isinstance(secure_origin[1], six.text_type) # setting secure_origin[1] to proper Union[bytes, str] # creates problems in other places else secure_origin[1].decode("utf8") # type: ignore ) except ValueError: # We don't have both a valid address or a valid network, so # we'll check this origin against hostnames. if (origin[1] and origin[1].lower() != secure_origin[1].lower() and secure_origin[1] != "*"): continue else: # We have a valid address and network, so see if the address # is contained within the network. if addr not in network: continue # Check to see if the port patches if (origin[2] != secure_origin[2] and secure_origin[2] != "*" and secure_origin[2] is not None): continue # If we've gotten here, then this origin matches the current # secure origin and we should return True return True # If we've gotten to this point, then the origin isn't secure and we # will not accept it as a valid location to search. We will however # log a warning that we are ignoring it. logger.warning( "The repository located at %s is not a trusted or secure host and " "is being ignored. If this repository is available via HTTPS we " "recommend you use HTTPS instead, otherwise you may silence " "this warning and allow it anyway with '--trusted-host %s'.", parsed.hostname, parsed.hostname, ) return False def make_link_evaluator(self, project_name): # type: (str) -> LinkEvaluator canonical_name = canonicalize_name(project_name) formats = self.format_control.get_allowed_formats(canonical_name) return LinkEvaluator( project_name=project_name, canonical_name=canonical_name, formats=formats, target_python=self._target_python, allow_yanked=self._allow_yanked, ignore_requires_python=self._ignore_requires_python, ) def find_all_candidates(self, project_name): # type: (str) -> List[InstallationCandidate] """Find all available InstallationCandidate for project_name This checks index_urls and find_links. All versions found are returned as an InstallationCandidate list. See LinkEvaluator.evaluate_link() for details on which files are accepted. """ search_scope = self.search_scope index_locations = search_scope.get_index_urls_locations(project_name) index_file_loc, index_url_loc = self._sort_locations(index_locations) fl_file_loc, fl_url_loc = self._sort_locations( self.find_links, expand_dir=True, ) file_locations = (Link(url) for url in itertools.chain( index_file_loc, fl_file_loc, )) # 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 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), ) 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) link_evaluator = self.make_link_evaluator(project_name) find_links_versions = self._package_versions( link_evaluator, # We trust every directly linked archive in find_links (Link(url, '-f') for url in self.find_links), ) 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(link_evaluator, page.iter_links()) ) file_versions = self._package_versions(link_evaluator, file_locations) if file_versions: file_versions.sort(reverse=True) logger.debug( 'Local files found: %s', ', '.join([ url_to_path(candidate.link.url) for candidate in file_versions ]) ) # This is an intentional priority ordering return file_versions + find_links_versions + page_versions def make_candidate_evaluator( self, project_name, # type: str specifier=None, # type: Optional[specifiers.BaseSpecifier] hashes=None, # type: Optional[Hashes] ): # type: (...) -> CandidateEvaluator """Create a CandidateEvaluator object to use. """ candidate_prefs = self._candidate_prefs return CandidateEvaluator.create( project_name=project_name, target_python=self._target_python, prefer_binary=candidate_prefs.prefer_binary, allow_all_prereleases=candidate_prefs.allow_all_prereleases, specifier=specifier, hashes=hashes, ) def find_candidates( self, project_name, # type: str specifier=None, # type: Optional[specifiers.BaseSpecifier] hashes=None, # type: Optional[Hashes] ): # type: (...) -> FoundCandidates """Find matches for the given project and specifier. :param specifier: An optional object implementing `filter` (e.g. `packaging.specifiers.SpecifierSet`) to filter applicable versions. :return: A `FoundCandidates` instance. """ candidates = self.find_all_candidates(project_name) candidate_evaluator = self.make_candidate_evaluator( project_name=project_name, specifier=specifier, hashes=hashes, ) return candidate_evaluator.make_found_candidates(candidates) def find_requirement(self, req, upgrade): # type: (InstallRequirement, bool) -> Optional[Link] """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 """ hashes = req.hashes(trust_internet=False) candidates = self.find_candidates( req.name, specifier=req.specifier, hashes=hashes, ) best_candidate = candidates.get_best() installed_version = None # type: Optional[_BaseVersion] if req.satisfied_by is not None: installed_version = parse_version(req.satisfied_by.version) def _format_versions(cand_iter): # This repeated parse_version and str() conversion is needed to # handle different vendoring sources from pip and pkg_resources. # If we stop using the pkg_resources provided specifier and start # using our own, we can drop the cast to str(). return ", ".join(sorted( {str(c.version) for c in cand_iter}, key=parse_version, )) or "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, _format_versions(candidates.iter_all()), ) 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, _format_versions(candidates.iter_applicable()), ) raise BestVersionAlreadyInstalled logger.debug( 'Using version %s (newest of versions: %s)', best_candidate.version, _format_versions(candidates.iter_applicable()), ) return best_candidate.link def _get_pages(self, locations, project_name): # type: (Iterable[Link], str) -> Iterable[HTMLPage] """ Yields (page, page_url) from the given locations, skipping locations that have errors. """ seen = set() # type: Set[Link] for location in locations: if location in seen: continue seen.add(location) page = _get_html_page(location, session=self.session) if page is None: continue yield page def _sort_links(self, links): # type: (Iterable[Link]) -> List[Link] """ Returns elements of links in order, non-egg links first, egg links second, while eliminating duplicates """ eggs, no_eggs = [], [] seen = set() # type: Set[Link] 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 _log_skipped_link(self, link, reason): # type: (Link, Text) -> None if link not in self._logged_links: # Mark this as a unicode string to prevent "UnicodeEncodeError: # 'ascii' codec can't encode character" in Python 2 when # the reason contains non-ascii characters. # Also, put the link at the end so the reason is more visible # and because the link string is usually very long. logger.debug(u'Skipping link: %s: %s', reason, link) self._logged_links.add(link) def get_install_candidate(self, link_evaluator, link): # type: (LinkEvaluator, Link) -> Optional[InstallationCandidate] """ If the link is a candidate for install, convert it to an InstallationCandidate and return it. Otherwise, return None. """ is_candidate, result = link_evaluator.evaluate_link(link) if not is_candidate: if result: self._log_skipped_link(link, reason=result) return None return InstallationCandidate( project=link_evaluator.project_name, link=link, # Convert the Text result to str since InstallationCandidate # accepts str. version=str(result), ) def _package_versions(self, link_evaluator, links): # type: (LinkEvaluator, Iterable[Link]) -> List[InstallationCandidate] result = [] for link in self._sort_links(links): candidate = self.get_install_candidate(link_evaluator, link) if candidate is not None: result.append(candidate) return result def _find_name_version_sep(fragment, canonical_name): # type: (str, str) -> int """Find the separator's index based on the package's canonical name. :param fragment: A + filename "fragment" (stem) or egg fragment. :param canonical_name: The package's canonical name. This function is needed since the canonicalized name does not necessarily have the same length as the egg info's name part. An example:: >>> fragment = 'foo__bar-1.0' >>> canonical_name = 'foo-bar' >>> _find_name_version_sep(fragment, canonical_name) 8 """ # Project name and version must be separated by one single dash. Find all # occurrences of dashes; if the string in front of it matches the canonical # name, this is the one separating the name and version parts. for i, c in enumerate(fragment): if c != "-": continue if canonicalize_name(fragment[:i]) == canonical_name: return i raise ValueError("{} does not match {}".format(fragment, canonical_name)) def _extract_version_from_fragment(fragment, canonical_name): # type: (str, str) -> Optional[str] """Parse the version string from a + filename "fragment" (stem) or egg fragment. :param fragment: The string to parse. E.g. foo-2.1 :param canonical_name: The canonicalized name of the package this belongs to. """ try: version_start = _find_name_version_sep(fragment, canonical_name) + 1 except ValueError: return None version = fragment[version_start:] if not version: return None return version def _determine_base_url(document, page_url): """Determine the HTML document's base URL. This looks for a ```` 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 def _clean_link(url): # type: (str) -> str """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).""" # Split the URL into parts according to the general structure # `scheme://netloc/path;parameters?query#fragment`. Note that the # `netloc` can be empty and the URI will then refer to a local # filesystem path. result = urllib_parse.urlparse(url) # In both cases below we unquote prior to quoting to make sure # nothing is double quoted. if result.netloc == "": # 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. path = urllib_request.pathname2url( urllib_request.url2pathname(result.path)) else: # In addition to the `/` character we protect `@` so that # revision strings in VCS URLs are properly parsed. path = urllib_parse.quote(urllib_parse.unquote(result.path), safe="/@") 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 HTMLPage(object): """Represents one page, along with its URL""" def __init__(self, content, url, headers=None): # type: (bytes, str, MutableMapping[str, str]) -> None self.content = content self.url = url self.headers = headers def __str__(self): return redact_password_from_url(self.url) def iter_links(self): # type: () -> Iterable[Link] """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"): link = _create_link_from_element( anchor, page_url=self.url, base_url=base_url, ) if link is None: continue yield link