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annotate lib/python3.8/site-packages/pip/_internal/utils/hashes.py @ 0:9e54283cc701 draft

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"planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
author guerler
date Mon, 27 Jul 2020 03:47:31 -0400
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1 from __future__ import absolute_import
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2
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3 import hashlib
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4
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5 from pip._vendor.six import iteritems, iterkeys, itervalues
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6
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7 from pip._internal.exceptions import (
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8 HashMismatch,
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9 HashMissing,
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10 InstallationError,
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11 )
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12 from pip._internal.utils.misc import read_chunks
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13 from pip._internal.utils.typing import MYPY_CHECK_RUNNING
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14
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15 if MYPY_CHECK_RUNNING:
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16 from typing import (
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17 Dict, List, BinaryIO, NoReturn, Iterator
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18 )
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19 from pip._vendor.six import PY3
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20 if PY3:
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21 from hashlib import _Hash
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22 else:
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23 from hashlib import _hash as _Hash
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24
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25
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26 # The recommended hash algo of the moment. Change this whenever the state of
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27 # the art changes; it won't hurt backward compatibility.
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28 FAVORITE_HASH = 'sha256'
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29
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30
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31 # Names of hashlib algorithms allowed by the --hash option and ``pip hash``
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32 # Currently, those are the ones at least as collision-resistant as sha256.
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33 STRONG_HASHES = ['sha256', 'sha384', 'sha512']
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34
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35
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36 class Hashes(object):
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37 """A wrapper that builds multiple hashes at once and checks them against
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38 known-good values
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39
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40 """
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41 def __init__(self, hashes=None):
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42 # type: (Dict[str, List[str]]) -> None
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43 """
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44 :param hashes: A dict of algorithm names pointing to lists of allowed
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45 hex digests
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46 """
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47 self._allowed = {} if hashes is None else hashes
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48
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49 @property
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50 def digest_count(self):
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51 # type: () -> int
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52 return sum(len(digests) for digests in self._allowed.values())
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53
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54 def is_hash_allowed(
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55 self,
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56 hash_name, # type: str
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57 hex_digest, # type: str
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58 ):
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59 # type: (...) -> bool
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60 """Return whether the given hex digest is allowed."""
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61 return hex_digest in self._allowed.get(hash_name, [])
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62
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63 def check_against_chunks(self, chunks):
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64 # type: (Iterator[bytes]) -> None
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65 """Check good hashes against ones built from iterable of chunks of
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66 data.
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67
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68 Raise HashMismatch if none match.
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69
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70 """
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71 gots = {}
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72 for hash_name in iterkeys(self._allowed):
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73 try:
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74 gots[hash_name] = hashlib.new(hash_name)
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75 except (ValueError, TypeError):
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76 raise InstallationError('Unknown hash name: %s' % hash_name)
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77
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78 for chunk in chunks:
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79 for hash in itervalues(gots):
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80 hash.update(chunk)
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81
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82 for hash_name, got in iteritems(gots):
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83 if got.hexdigest() in self._allowed[hash_name]:
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84 return
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85 self._raise(gots)
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86
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87 def _raise(self, gots):
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88 # type: (Dict[str, _Hash]) -> NoReturn
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89 raise HashMismatch(self._allowed, gots)
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90
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91 def check_against_file(self, file):
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92 # type: (BinaryIO) -> None
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93 """Check good hashes against a file-like object
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94
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95 Raise HashMismatch if none match.
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96
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97 """
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98 return self.check_against_chunks(read_chunks(file))
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99
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100 def check_against_path(self, path):
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101 # type: (str) -> None
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102 with open(path, 'rb') as file:
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103 return self.check_against_file(file)
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104
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105 def __nonzero__(self):
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106 # type: () -> bool
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107 """Return whether I know any known-good hashes."""
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108 return bool(self._allowed)
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109
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110 def __bool__(self):
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111 # type: () -> bool
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112 return self.__nonzero__()
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113
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114
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115 class MissingHashes(Hashes):
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116 """A workalike for Hashes used when we're missing a hash for a requirement
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117
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118 It computes the actual hash of the requirement and raises a HashMissing
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119 exception showing it to the user.
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120
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121 """
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122 def __init__(self):
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123 # type: () -> None
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124 """Don't offer the ``hashes`` kwarg."""
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125 # Pass our favorite hash in to generate a "gotten hash". With the
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126 # empty list, it will never match, so an error will always raise.
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127 super(MissingHashes, self).__init__(hashes={FAVORITE_HASH: []})
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128
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129 def _raise(self, gots):
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130 # type: (Dict[str, _Hash]) -> NoReturn
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131 raise HashMissing(gots[FAVORITE_HASH].hexdigest())