You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
116 lines
3.5 KiB
Python
116 lines
3.5 KiB
Python
from __future__ import absolute_import
|
|
|
|
import hashlib
|
|
|
|
from pip._vendor.six import iteritems, iterkeys, itervalues
|
|
|
|
from pip._internal.exceptions import (
|
|
HashMismatch, HashMissing, InstallationError,
|
|
)
|
|
from pip._internal.utils.misc import read_chunks
|
|
from pip._internal.utils.typing import MYPY_CHECK_RUNNING
|
|
|
|
if MYPY_CHECK_RUNNING:
|
|
from typing import ( # noqa: F401
|
|
Dict, List, BinaryIO, NoReturn, Iterator
|
|
)
|
|
from pip._vendor.six import PY3
|
|
if PY3:
|
|
from hashlib import _Hash # noqa: F401
|
|
else:
|
|
from hashlib import _hash as _Hash # noqa: F401
|
|
|
|
|
|
# The recommended hash algo of the moment. Change this whenever the state of
|
|
# the art changes; it won't hurt backward compatibility.
|
|
FAVORITE_HASH = 'sha256'
|
|
|
|
|
|
# Names of hashlib algorithms allowed by the --hash option and ``pip hash``
|
|
# Currently, those are the ones at least as collision-resistant as sha256.
|
|
STRONG_HASHES = ['sha256', 'sha384', 'sha512']
|
|
|
|
|
|
class Hashes(object):
|
|
"""A wrapper that builds multiple hashes at once and checks them against
|
|
known-good values
|
|
|
|
"""
|
|
def __init__(self, hashes=None):
|
|
# type: (Dict[str, List[str]]) -> None
|
|
"""
|
|
:param hashes: A dict of algorithm names pointing to lists of allowed
|
|
hex digests
|
|
"""
|
|
self._allowed = {} if hashes is None else hashes
|
|
|
|
def check_against_chunks(self, chunks):
|
|
# type: (Iterator[bytes]) -> None
|
|
"""Check good hashes against ones built from iterable of chunks of
|
|
data.
|
|
|
|
Raise HashMismatch if none match.
|
|
|
|
"""
|
|
gots = {}
|
|
for hash_name in iterkeys(self._allowed):
|
|
try:
|
|
gots[hash_name] = hashlib.new(hash_name)
|
|
except (ValueError, TypeError):
|
|
raise InstallationError('Unknown hash name: %s' % hash_name)
|
|
|
|
for chunk in chunks:
|
|
for hash in itervalues(gots):
|
|
hash.update(chunk)
|
|
|
|
for hash_name, got in iteritems(gots):
|
|
if got.hexdigest() in self._allowed[hash_name]:
|
|
return
|
|
self._raise(gots)
|
|
|
|
def _raise(self, gots):
|
|
# type: (Dict[str, _Hash]) -> NoReturn
|
|
raise HashMismatch(self._allowed, gots)
|
|
|
|
def check_against_file(self, file):
|
|
# type: (BinaryIO) -> None
|
|
"""Check good hashes against a file-like object
|
|
|
|
Raise HashMismatch if none match.
|
|
|
|
"""
|
|
return self.check_against_chunks(read_chunks(file))
|
|
|
|
def check_against_path(self, path):
|
|
# type: (str) -> None
|
|
with open(path, 'rb') as file:
|
|
return self.check_against_file(file)
|
|
|
|
def __nonzero__(self):
|
|
# type: () -> bool
|
|
"""Return whether I know any known-good hashes."""
|
|
return bool(self._allowed)
|
|
|
|
def __bool__(self):
|
|
# type: () -> bool
|
|
return self.__nonzero__()
|
|
|
|
|
|
class MissingHashes(Hashes):
|
|
"""A workalike for Hashes used when we're missing a hash for a requirement
|
|
|
|
It computes the actual hash of the requirement and raises a HashMissing
|
|
exception showing it to the user.
|
|
|
|
"""
|
|
def __init__(self):
|
|
# type: () -> None
|
|
"""Don't offer the ``hashes`` kwarg."""
|
|
# Pass our favorite hash in to generate a "gotten hash". With the
|
|
# empty list, it will never match, so an error will always raise.
|
|
super(MissingHashes, self).__init__(hashes={FAVORITE_HASH: []})
|
|
|
|
def _raise(self, gots):
|
|
# type: (Dict[str, _Hash]) -> NoReturn
|
|
raise HashMissing(gots[FAVORITE_HASH].hexdigest())
|