"""Routines related to PyPI, indexes"""
from __future__ import absolute_import
import logging
import cgi
import sys
import os
import re
import mimetypes
import posixpath
import warnings
from pip._vendor.six.moves.urllib import parse as urllib_parse
from pip._vendor.six.moves.urllib import request as urllib_request
from pip.compat import ipaddress
from pip.utils import Inf, cached_property, normalize_name, splitext
from pip.utils.deprecation import RemovedInPip7Warning, RemovedInPip8Warning
from pip.utils.logging import indent_log
from pip.exceptions import (
DistributionNotFound, BestVersionAlreadyInstalled, InvalidWheelFilename,
UnsupportedWheel,
)
from pip.download import url_to_path, path_to_url
from pip.models import PyPI
from pip.wheel import Wheel, wheel_ext
from pip.pep425tags import supported_tags, supported_tags_noarch, get_platform
from pip.req.req_requirement import InstallationCandidate
from pip._vendor import html5lib, requests, pkg_resources, six
from pip._vendor.packaging.version import parse as parse_version
from pip._vendor.requests.exceptions import SSLError
__all__ = ['PackageFinder']
# Taken from Chrome's list of secure origins (See: http://bit.ly/1qrySKC)
SECURE_ORIGINS = [
# protocol, hostname, port
("https", "*", "*"),
("*", "localhost", "*"),
("*", "127.0.0.0/8", "*"),
("*", "::1/128", "*"),
("file", "*", None),
]
logger = logging.getLogger(__name__)
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, find_links, index_urls,
use_wheel=True, allow_external=(), allow_unverified=(),
allow_all_external=False, allow_all_prereleases=False,
trusted_hosts=None, process_dependency_links=False,
session=None):
if session is None:
raise TypeError(
"PackageFinder() missing 1 required keyword argument: "
"'session'"
)
self.find_links = find_links
self.index_urls = index_urls
self.dependency_links = []
# These are boring links that have already been logged somehow:
self.logged_links = set()
self.use_wheel = use_wheel
# Do we allow (safe and verifiable) externally hosted files?
self.allow_external = set(normalize_name(n) for n in allow_external)
# Which names are allowed to install insecure and unverifiable files?
self.allow_unverified = set(
normalize_name(n) for n in allow_unverified
)
# Anything that is allowed unverified is also allowed external
self.allow_external |= self.allow_unverified
# Do we allow all (safe and verifiable) externally hosted files?
self.allow_all_external = allow_all_external
# Domains that we won't emit warnings for when not using HTTPS
self.secure_origins = [
("*", host, "*")
for host in (trusted_hosts if trusted_hosts else [])
]
# Stores if we ignored any external links so that we can instruct
# end users how to install them if no distributions are available
self.need_warn_external = False
# Stores if we ignored any unsafe links so that we can instruct
# end users how to install them if no distributions are available
self.need_warn_unverified = False
# Do we want to allow _all_ pre-releases?
self.allow_all_prereleases = allow_all_prereleases
# Do we process dependency links?
self.process_dependency_links = process_dependency_links
# The Session we'll use to make requests
self.session = session
def add_dependency_links(self, links):
# # FIXME: this shouldn't be global list this, it should only
# # apply to requirements of the package that specifies the
# # dependency_links value
# # FIXME: also, we should track comes_from (i.e., use Link)
if self.process_dependency_links:
warnings.warn(
"Dependency Links processing has been deprecated and will be "
"removed in a future release.",
RemovedInPip7Warning,
)
self.dependency_links.extend(links)
def _sort_locations(self, locations):
"""
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:')
is_find_link = url in self.find_links
if is_local_path or is_file_url:
if is_local_path:
path = url
else:
path = url_to_path(url)
if is_find_link and os.path.isdir(path):
path = os.path.realpath(path)
for item in os.listdir(path):
sort_path(os.path.join(path, item))
elif is_file_url and os.path.isdir(path):
urls.append(url)
elif os.path.isfile(path):
sort_path(path)
else:
urls.append(url)
return files, urls
def _candidate_sort_key(self, candidate):
"""
Function used to generate link sort key for link tuples.
The greater the return value, the more preferred it is.
If not finding wheels, then 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()
3. source archives
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
"""
if self.use_wheel:
support_num = len(supported_tags)
if candidate.location == INSTALLED_VERSION:
pri = 1
elif candidate.location.ext == wheel_ext:
# can raise InvalidWheelFilename
wheel = Wheel(candidate.location.filename)
if not wheel.supported():
raise UnsupportedWheel(
"%s is not a supported wheel for this platform. It "
"can't be sorted." % wheel.filename
)
pri = -(wheel.support_index_min())
else: # sdist
pri = -(support_num)
return (candidate.version, pri)
else:
return candidate.version
def _sort_versions(self, applicable_versions):
"""
Bring the latest version (and wheels) to the front, but maintain the
existing ordering as secondary. See the docstring for `_link_sort_key`
for details. This function is isolated for easier unit testing.
"""
return sorted(
applicable_versions,
key=self._candidate_sort_key,
reverse=True
)
def _validate_secure_origin(self, logger, location):
# Determine if this url used a secure transport mechanism
parsed = urllib_parse.urlparse(str(location))
origin = (parsed.scheme, parsed.hostname, parsed.port)
# 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 (SECURE_ORIGINS + self.secure_origins):
# Check to see if the protocol matches
if origin[0] != 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)
else secure_origin[1].decode("utf8")
)
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] != secure_origin[1] 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 break out of the loop and continue
# on.
break
else:
# If the loop successfully completed without a break, that means
# that the origin we are testing is not a secure origin.
logger.warning(
"This repository located at %s is not a trusted host, if "
"this repository is available via HTTPS it is recommend to "
"use HTTPS instead, otherwise you may silence this warning "
"with '--trusted-host %s'.",
parsed.hostname,
parsed.hostname,
)
warnings.warn(
"Implicitly allowing locations which are not hosted at a "
"secure origin is deprecated and will require the use of "
"--trusted-host in the future.",
RemovedInPip7Warning,
)
def find_requirement(self, req, upgrade):
def mkurl_pypi_url(url):
loc = posixpath.join(url, url_name)
# For maximum compatibility with easy_install, ensure the path
# ends in a trailing slash. Although this isn't in the spec
# (and PyPI can handle it without the slash) some other index
# implementations might break if they relied on easy_install's
# behavior.
if not loc.endswith('/'):
loc = loc + '/'
return loc
url_name = req.url_name
# Only check main index if index URL is given:
main_index_url = None
if self.index_urls:
# Check that we have the url_name correctly spelled:
main_index_url = Link(
mkurl_pypi_url(self.index_urls[0]),
trusted=True,
)
page = self._get_page(main_index_url, req)
if page is None and PyPI.netloc not in str(main_index_url):
warnings.warn(
"Failed to find %r at %s. It is suggested to upgrade "
"your index to support normalized names as the name in "
"/simple/{name}." % (req.name, main_index_url),
RemovedInPip8Warning,
)
url_name = self._find_url_name(
Link(self.index_urls[0], trusted=True),
url_name, req
) or req.url_name
if url_name is not None:
locations = [
mkurl_pypi_url(url)
for url in self.index_urls] + self.find_links
else:
locations = list(self.find_links)
file_locations, url_locations = self._sort_locations(locations)
_flocations, _ulocations = self._sort_locations(self.dependency_links)
file_locations.extend(_flocations)
# We trust every url that the user has given us whether it was given
# via --index-url or --find-links
locations = [Link(url, trusted=True) for url in url_locations]
# We explicitly do not trust links that came from dependency_links
locations.extend([Link(url) for url in _ulocations])
logger.debug('URLs to search for versions for %s:', req)
for location in locations:
logger.debug('* %s', location)
self._validate_secure_origin(logger, location)
found_versions = []
found_versions.extend(
self._package_versions(
# We trust every directly linked archive in find_links
[Link(url, '-f', trusted=True) for url in self.find_links],
req.name.lower()
)
)
page_versions = []
for page in self._get_pages(locations, req):
logger.debug('Analyzing links from page %s', page.url)
with indent_log():
page_versions.extend(
self._package_versions(page.links, req.name.lower())
)
dependency_versions = list(self._package_versions(
[Link(url) for url in self.dependency_links], req.name.lower()))
if dependency_versions:
logger.debug(
'dependency_links found: %s',
', '.join([
version.location.url for version in dependency_versions
])
)
file_versions = list(
self._package_versions(
[Link(url) for url in file_locations],
req.name.lower()
)
)
if (not found_versions
and not page_versions
and not dependency_versions
and not file_versions):
logger.critical(
'Could not find any downloads that satisfy the requirement %s',
req,
)
if self.need_warn_external:
logger.warning(
"Some externally hosted files were ignored as access to "
"them may be unreliable (use --allow-external %s to "
"allow).",
req.name,
)
if self.need_warn_unverified:
logger.warning(
"Some insecure and unverifiable files were ignored"
" (use --allow-unverified %s to allow).",
req.name,
)
raise DistributionNotFound(
'No distributions at all found for %s' % req
)
installed_version = []
if req.satisfied_by is not None:
installed_version = [
InstallationCandidate(
req.name,
req.satisfied_by.version,
INSTALLED_VERSION,
),
]
if file_versions:
file_versions.sort(reverse=True)
logger.debug(
'Local files found: %s',
', '.join([
url_to_path(candidate.location.url)
for candidate in file_versions
])
)
# This is an intentional priority ordering
all_versions = (
file_versions + found_versions + page_versions
+ dependency_versions
)
# Filter out anything which doesn't match our specifier
_versions = set(
req.specifier.filter(
[x.version for x in all_versions],
prereleases=(
self.allow_all_prereleases
if self.allow_all_prereleases else None
),
)
)
applicable_versions = [
x for x in all_versions if x.version in _versions
]
# Finally add our existing versions to the front of our versions.
applicable_versions = installed_version + applicable_versions
applicable_versions = self._sort_versions(applicable_versions)
existing_applicable = any(
i.location is INSTALLED_VERSION
for i in applicable_versions
)
if not upgrade and existing_applicable:
if applicable_versions[0].location is INSTALLED_VERSION:
logger.debug(
'Existing installed version (%s) is most up-to-date and '
'satisfies requirement',
req.satisfied_by.version,
)
else:
logger.debug(
'Existing installed version (%s) satisfies requirement '
'(most up-to-date version is %s)',
req.satisfied_by.version,
applicable_versions[0][2],
)
return None
if not applicable_versions:
logger.critical(
'Could not find a version that satisfies the requirement %s '
'(from versions: %s)',
req,
', '.join(
sorted(
set(str(i.version) for i in all_versions),
key=parse_version,
)
)
)
if self.need_warn_external:
logger.warning(
"Some externally hosted files were ignored as access to "
"them may be unreliable (use --allow-external to allow)."
)
if self.need_warn_unverified:
logger.warning(
"Some insecure and unverifiable files were ignored"
" (use --allow-unverified %s to allow).",
req.name,
)
raise DistributionNotFound(
'No distributions matching the version for %s' % req
)
if applicable_versions[0].location is INSTALLED_VERSION:
# We have an existing version, and its the best version
logger.debug(
'Installed version (%s) is most up-to-date (past versions: '
'%s)',
req.satisfied_by.version,
', '.join(str(i.version) for i in applicable_versions[1:])
or "none",
)
raise BestVersionAlreadyInstalled
if len(applicable_versions) > 1:
logger.debug(
'Using version %s (newest of versions: %s)',
applicable_versions[0].version,
', '.join(str(i.version) for i in applicable_versions)
)
selected_version = applicable_versions[0].location
if (selected_version.verifiable is not None
and not selected_version.verifiable):
logger.warning(
"%s is potentially insecure and unverifiable.", req.name,
)
if selected_version._deprecated_regex:
warnings.warn(
"%s discovered using a deprecated method of parsing, in the "
"future it will no longer be discovered." % req.name,
RemovedInPip7Warning,
)
return selected_version
def _find_url_name(self, index_url, url_name, req):
"""
Finds the true URL name of a package, when the given name isn't quite
correct.
This is usually used to implement case-insensitivity.
"""
if not index_url.url.endswith('/'):
# Vaguely part of the PyPI API... weird but true.
# FIXME: bad to modify this?
index_url.url += '/'
page = self._get_page(index_url, req)
if page is None:
logger.critical('Cannot fetch index base URL %s', index_url)
return
norm_name = normalize_name(req.url_name)
for link in page.links:
base = posixpath.basename(link.path.rstrip('/'))
if norm_name == normalize_name(base):
logger.debug(
'Real name of requirement %s is %s', url_name, base,
)
return base
return None
def _get_pages(self, locations, req):
"""
Yields (page, page_url) from the given locations, skipping
locations that have errors, and adding download/homepage links
"""
all_locations = list(locations)
seen = set()
while all_locations:
location = all_locations.pop(0)
if location in seen:
continue
seen.add(location)
page = self._get_page(location, req)
if page is None:
continue
yield page
for link in page.rel_links():
normalized = normalize_name(req.name).lower()
if (normalized not in self.allow_external
and not self.allow_all_external):
self.need_warn_external = True
logger.debug(
"Not searching %s for files because external "
"urls are disallowed.",
link,
)
continue
if (link.trusted is not None
and not link.trusted
and normalized not in self.allow_unverified):
logger.debug(
"Not searching %s for urls, it is an "
"untrusted link and cannot produce safe or "
"verifiable files.",
link,
)
self.need_warn_unverified = True
continue
all_locations.append(link)
_egg_fragment_re = re.compile(r'#egg=([^&]*)')
_egg_info_re = re.compile(r'([a-z0-9_.]+)-([a-z0-9_.!+-]+)', re.I)
_py_version_re = re.compile(r'-py([123]\.?[0-9]?)$')
def _sort_links(self, links):
"""
Returns elements of links in order, non-egg links first, egg links
second, while eliminating duplicates
"""
eggs, no_eggs = [], []
seen = set()
for link in links:
if link not in seen:
seen.add(link)
if link.egg_fragment:
eggs.append(link)
else:
no_eggs.append(link)
return no_eggs + eggs
def _package_versions(self, links, search_name):
for link in self._sort_links(links):
v = self._link_package_versions(link, search_name)
if v is not None:
yield v
def _known_extensions(self):
extensions = ('.tar.gz', '.tar.bz2', '.tar', '.tgz', '.zip')
if self.use_wheel:
return extensions + (wheel_ext,)
return extensions
def _link_package_versions(self, link, search_name):
"""
Return an iterable of triples (pkg_resources_version_key,
link, python_version) that can be extracted from the given
link.
Meant to be overridden by subclasses, not called by clients.
"""
platform = get_platform()
version = None
if link.egg_fragment:
egg_info = link.egg_fragment
else:
egg_info, ext = link.splitext()
if not ext:
if link not in self.logged_links:
logger.debug('Skipping link %s; not a file', link)
self.logged_links.add(link)
return
if egg_info.endswith('.tar'):
# Special double-extension case:
egg_info = egg_info[:-4]
ext = '.tar' + ext
if ext not in self._known_extensions():
if link not in self.logged_links:
logger.debug(
'Skipping link %s; unknown archive format: %s',
link,
ext,
)
self.logged_links.add(link)
return
if "macosx10" in link.path and ext == '.zip':
if link not in self.logged_links:
logger.debug('Skipping link %s; macosx10 one', link)
self.logged_links.add(link)
return
if ext == wheel_ext:
try:
wheel = Wheel(link.filename)
except InvalidWheelFilename:
logger.debug(
'Skipping %s because the wheel filename is invalid',
link
)
return
if (pkg_resources.safe_name(wheel.name).lower()
!= pkg_resources.safe_name(search_name).lower()):
logger.debug(
'Skipping link %s; wrong project name (not %s)',
link,
search_name,
)
return
if not wheel.supported():
logger.debug(
'Skipping %s because it is not compatible with this '
'Python',
link,
)
return
# This is a dirty hack to prevent installing Binary Wheels from
# PyPI unless it is a Windows or Mac Binary Wheel. This is
# paired with a change to PyPI disabling uploads for the
# same. Once we have a mechanism for enabling support for
# binary wheels on linux that deals with the inherent problems
# of binary distribution this can be removed.
comes_from = getattr(link, "comes_from", None)
if (
(
not platform.startswith('win')
and not platform.startswith('macosx')
and not platform == 'cli'
)
and comes_from is not None
and urllib_parse.urlparse(
comes_from.url
).netloc.endswith(PyPI.netloc)):
if not wheel.supported(tags=supported_tags_noarch):
logger.debug(
"Skipping %s because it is a pypi-hosted binary "
"Wheel on an unsupported platform",
link,
)
return
version = wheel.version
if not version:
version = self._egg_info_matches(egg_info, search_name, link)
if version is None:
logger.debug(
'Skipping link %s; wrong project name (not %s)',
link,
search_name,
)
return
if (link.internal is not None
and not link.internal
and not normalize_name(search_name).lower()
in self.allow_external
and not self.allow_all_external):
# We have a link that we are sure is external, so we should skip
# it unless we are allowing externals
logger.debug("Skipping %s because it is externally hosted.", link)
self.need_warn_external = True
return
if (link.verifiable is not None
and not link.verifiable
and not (normalize_name(search_name).lower()
in self.allow_unverified)):
# We have a link that we are sure we cannot verify its integrity,
# so we should skip it unless we are allowing unsafe installs
# for this requirement.
logger.debug(
"Skipping %s because it is an insecure and unverifiable file.",
link,
)
self.need_warn_unverified = True
return
match = self._py_version_re.search(version)
if match:
version = version[:match.start()]
py_version = match.group(1)
if py_version != sys.version[:3]:
logger.debug(
'Skipping %s because Python version is incorrect', link
)
return
logger.debug('Found link %s, version: %s', link, version)
return InstallationCandidate(search_name, version, link)
def _egg_info_matches(self, egg_info, search_name, link):
match = self._egg_info_re.search(egg_info)
if not match:
logger.debug('Could not parse version from link: %s', link)
return None
name = match.group(0).lower()
# To match the "safe" name that pkg_resources creates:
name = name.replace('_', '-')
# project name and version must be separated by a dash
look_for = search_name.lower() + "-"
if name.startswith(look_for):
return match.group(0)[len(look_for):]
else:
return None
def _get_page(self, link, req):
return HTMLPage.get_page(link, req, session=self.session)
class HTMLPage(object):
"""Represents one page, along with its URL"""
# FIXME: these regexes are horrible hacks:
_homepage_re = re.compile(b'
\\s*download\\s+url', re.I)
_href_re = re.compile(
b'href=(?:"([^"]*)"|\'([^\']*)\'|([^>\\s\\n]*))',
re.I | re.S
)
def __init__(self, content, url, headers=None, trusted=None):
# Determine if we have any encoding information in our headers
encoding = None
if headers and "Content-Type" in headers:
content_type, params = cgi.parse_header(headers["Content-Type"])
if "charset" in params:
encoding = params['charset']
self.content = content
self.parsed = html5lib.parse(
self.content,
encoding=encoding,
namespaceHTMLElements=False,
)
self.url = url
self.headers = headers
self.trusted = trusted
def __str__(self):
return self.url
@classmethod
def get_page(cls, link, req, skip_archives=True, session=None):
if session is None:
raise TypeError(
"get_page() missing 1 required keyword argument: 'session'"
)
url = link.url
url = url.split('#', 1)[0]
# Check for VCS schemes that do not support lookup as web pages.
from pip.vcs import VcsSupport
for scheme in VcsSupport.schemes:
if url.lower().startswith(scheme) and url[len(scheme)] in '+:':
logger.debug('Cannot look at %s URL %s', scheme, link)
return None
try:
if skip_archives:
filename = link.filename
for bad_ext in ['.tar', '.tar.gz', '.tar.bz2', '.tgz', '.zip']:
if filename.endswith(bad_ext):
content_type = cls._get_content_type(
url, session=session,
)
if content_type.lower().startswith('text/html'):
break
else:
logger.debug(
'Skipping page %s because of Content-Type: %s',
link,
content_type,
)
return
logger.debug('Getting page %s', url)
# Tack index.html onto file:// URLs that point to directories
(scheme, netloc, path, params, query, fragment) = \
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)
resp = session.get(
url,
headers={
"Accept": "text/html",
"Cache-Control": "max-age=600",
},
)
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.
content_type = resp.headers.get('Content-Type', 'unknown')
if not content_type.lower().startswith("text/html"):
logger.debug(
'Skipping page %s because of Content-Type: %s',
link,
content_type,
)
return
inst = cls(
resp.content, resp.url, resp.headers,
trusted=link.trusted,
)
except requests.HTTPError as exc:
level = 2 if exc.response.status_code == 404 else 1
cls._handle_fail(req, link, exc, url, level=level)
except requests.ConnectionError as exc:
cls._handle_fail(
req, link, "connection error: %s" % exc, url,
)
except requests.Timeout:
cls._handle_fail(req, link, "timed out", url)
except SSLError as exc:
reason = ("There was a problem confirming the ssl certificate: "
"%s" % exc)
cls._handle_fail(
req, link, reason, url,
level=2,
meth=logger.info,
)
else:
return inst
@staticmethod
def _handle_fail(req, link, reason, url, level=1, meth=None):
if meth is None:
meth = logger.debug
meth("Could not fetch URL %s: %s", link, reason)
meth("Will skip URL %s when looking for download links for %s" %
(link.url, req))
@staticmethod
def _get_content_type(url, session):
"""Get the Content-Type of the given url, using a HEAD request"""
scheme, netloc, path, query, fragment = urllib_parse.urlsplit(url)
if scheme not in ('http', 'https'):
# FIXME: some warning or something?
# assertion error?
return ''
resp = session.head(url, allow_redirects=True)
resp.raise_for_status()
return resp.headers.get("Content-Type", "")
@cached_property
def api_version(self):
metas = [
x for x in self.parsed.findall(".//meta")
if x.get("name", "").lower() == "api-version"
]
if metas:
try:
return int(metas[0].get("value", None))
except (TypeError, ValueError):
pass
return None
@cached_property
def base_url(self):
bases = [
x for x in self.parsed.findall(".//base")
if x.get("href") is not None
]
if bases and bases[0].get("href"):
return bases[0].get("href")
else:
return self.url
@property
def links(self):
"""Yields all links in the page"""
for anchor in self.parsed.findall(".//a"):
if anchor.get("href"):
href = anchor.get("href")
url = self.clean_link(
urllib_parse.urljoin(self.base_url, href)
)
# Determine if this link is internal. If that distinction
# doesn't make sense in this context, then we don't make
# any distinction.
internal = None
if self.api_version and self.api_version >= 2:
# Only api_versions >= 2 have a distinction between
# external and internal links
internal = bool(
anchor.get("rel")
and "internal" in anchor.get("rel").split()
)
yield Link(url, self, internal=internal)
def rel_links(self):
for url in self.explicit_rel_links():
yield url
for url in self.scraped_rel_links():
yield url
def explicit_rel_links(self, rels=('homepage', 'download')):
"""Yields all links with the given relations"""
rels = set(rels)
for anchor in self.parsed.findall(".//a"):
if anchor.get("rel") and anchor.get("href"):
found_rels = set(anchor.get("rel").split())
# Determine the intersection between what rels were found and
# what rels were being looked for
if found_rels & rels:
href = anchor.get("href")
url = self.clean_link(
urllib_parse.urljoin(self.base_url, href)
)
yield Link(url, self, trusted=False)
def scraped_rel_links(self):
# Can we get rid of this horrible horrible method?
for regex in (self._homepage_re, self._download_re):
match = regex.search(self.content)
if not match:
continue
href_match = self._href_re.search(self.content, pos=match.end())
if not href_match:
continue
url = (
href_match.group(1)
or href_match.group(2)
or href_match.group(3)
)
if not url:
continue
try:
url = url.decode("ascii")
except UnicodeDecodeError:
continue
url = self.clean_link(urllib_parse.urljoin(self.base_url, url))
yield Link(url, self, trusted=False, _deprecated_regex=True)
_clean_re = re.compile(r'[^a-z0-9$&+,/:;=?@.#%_\\|-]', re.I)
def clean_link(self, url):
"""Makes sure a link is fully encoded. That is, if a ' ' shows up in
the link, it will be rewritten to %20 (while not over-quoting
% or other characters)."""
return self._clean_re.sub(
lambda match: '%%%2x' % ord(match.group(0)), url)
class Link(object):
def __init__(self, url, comes_from=None, internal=None, trusted=None,
_deprecated_regex=False):
# url can be a UNC windows share
if url != Inf and url.startswith('\\\\'):
url = path_to_url(url)
self.url = url
self.comes_from = comes_from
self.internal = internal
self.trusted = trusted
self._deprecated_regex = _deprecated_regex
def __str__(self):
if self.comes_from:
return '%s (from %s)' % (self.url, self.comes_from)
else:
return str(self.url)
def __repr__(self):
return '' % self
def __eq__(self, other):
if not isinstance(other, Link):
return NotImplemented
return self.url == other.url
def __ne__(self, other):
if not isinstance(other, Link):
return NotImplemented
return self.url != other.url
def __lt__(self, other):
if not isinstance(other, Link):
return NotImplemented
return self.url < other.url
def __le__(self, other):
if not isinstance(other, Link):
return NotImplemented
return self.url <= other.url
def __gt__(self, other):
if not isinstance(other, Link):
return NotImplemented
return self.url > other.url
def __ge__(self, other):
if not isinstance(other, Link):
return NotImplemented
return self.url >= other.url
def __hash__(self):
return hash(self.url)
@property
def filename(self):
_, netloc, path, _, _ = urllib_parse.urlsplit(self.url)
name = posixpath.basename(path.rstrip('/')) or netloc
name = urllib_parse.unquote(name)
assert name, ('URL %r produced no filename' % self.url)
return name
@property
def scheme(self):
return urllib_parse.urlsplit(self.url)[0]
@property
def netloc(self):
return urllib_parse.urlsplit(self.url)[1]
@property
def path(self):
return urllib_parse.unquote(urllib_parse.urlsplit(self.url)[2])
def splitext(self):
return splitext(posixpath.basename(self.path.rstrip('/')))
@property
def ext(self):
return self.splitext()[1]
@property
def url_without_fragment(self):
scheme, netloc, path, query, fragment = urllib_parse.urlsplit(self.url)
return urllib_parse.urlunsplit((scheme, netloc, path, query, None))
_egg_fragment_re = re.compile(r'#egg=([^&]*)')
@property
def egg_fragment(self):
match = self._egg_fragment_re.search(self.url)
if not match:
return None
return match.group(1)
_hash_re = re.compile(
r'(sha1|sha224|sha384|sha256|sha512|md5)=([a-f0-9]+)'
)
@property
def hash(self):
match = self._hash_re.search(self.url)
if match:
return match.group(2)
return None
@property
def hash_name(self):
match = self._hash_re.search(self.url)
if match:
return match.group(1)
return None
@property
def show_url(self):
return posixpath.basename(self.url.split('#', 1)[0].split('?', 1)[0])
@property
def verifiable(self):
"""
Returns True if this link can be verified after download, False if it
cannot, and None if we cannot determine.
"""
trusted = self.trusted or getattr(self.comes_from, "trusted", None)
if trusted is not None and trusted:
# This link came from a trusted source. It *may* be verifiable but
# first we need to see if this page is operating under the new
# API version.
try:
api_version = getattr(self.comes_from, "api_version", None)
api_version = int(api_version)
except (ValueError, TypeError):
api_version = None
if api_version is None or api_version <= 1:
# This link is either trusted, or it came from a trusted,
# however it is not operating under the API version 2 so
# we can't make any claims about if it's safe or not
return
if self.hash:
# This link came from a trusted source and it has a hash, so we
# can consider it safe.
return True
else:
# This link came from a trusted source, using the new API
# version, and it does not have a hash. It is NOT verifiable
return False
elif trusted is not None:
# This link came from an untrusted source and we cannot trust it
return False
# An object to represent the "link" for the installed version of a requirement.
# Using Inf as the url makes it sort higher.
INSTALLED_VERSION = Link(Inf)