Mercurial > repos > guerler > springsuite

annotate planemo/lib/python3.7/site-packages/pip/_internal/utils/hashes.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
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1
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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, HashMissing, InstallationError,
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9 )
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10 from pip._internal.utils.misc import read_chunks
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11 from pip._internal.utils.typing import MYPY_CHECK_RUNNING
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12
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13 if MYPY_CHECK_RUNNING:
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14 from typing import (
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15 Dict, List, BinaryIO, NoReturn, Iterator
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16 )
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17 from pip._vendor.six import PY3
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18 if PY3:
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19 from hashlib import _Hash
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20 else:
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21 from hashlib import _hash as _Hash
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22
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23
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24 # The recommended hash algo of the moment. Change this whenever the state of
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25 # the art changes; it won't hurt backward compatibility.
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26 FAVORITE_HASH = 'sha256'
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27
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28
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29 # Names of hashlib algorithms allowed by the --hash option and ``pip hash``
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30 # Currently, those are the ones at least as collision-resistant as sha256.
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31 STRONG_HASHES = ['sha256', 'sha384', 'sha512']
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32
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33
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34 class Hashes(object):
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35 """A wrapper that builds multiple hashes at once and checks them against
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36 known-good values
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37
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38 """
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39 def __init__(self, hashes=None):
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40 # type: (Dict[str, List[str]]) -> None
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41 """
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42 :param hashes: A dict of algorithm names pointing to lists of allowed
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43 hex digests
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44 """
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45 self._allowed = {} if hashes is None else hashes
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46
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47 @property
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48 def digest_count(self):
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49 # type: () -> int
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50 return sum(len(digests) for digests in self._allowed.values())
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51
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52 def is_hash_allowed(
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53 self,
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54 hash_name, # type: str
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55 hex_digest, # type: str
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56 ):
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57 """Return whether the given hex digest is allowed."""
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58 return hex_digest in self._allowed.get(hash_name, [])
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59
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60 def check_against_chunks(self, chunks):
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61 # type: (Iterator[bytes]) -> None
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62 """Check good hashes against ones built from iterable of chunks of
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63 data.
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64
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65 Raise HashMismatch if none match.
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66
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67 """
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68 gots = {}
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69 for hash_name in iterkeys(self._allowed):
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70 try:
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71 gots[hash_name] = hashlib.new(hash_name)
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72 except (ValueError, TypeError):
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73 raise InstallationError('Unknown hash name: %s' % hash_name)
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74
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75 for chunk in chunks:
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76 for hash in itervalues(gots):
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77 hash.update(chunk)
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78
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79 for hash_name, got in iteritems(gots):
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80 if got.hexdigest() in self._allowed[hash_name]:
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81 return
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82 self._raise(gots)
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83
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84 def _raise(self, gots):
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85 # type: (Dict[str, _Hash]) -> NoReturn
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86 raise HashMismatch(self._allowed, gots)
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87
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88 def check_against_file(self, file):
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89 # type: (BinaryIO) -> None
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90 """Check good hashes against a file-like object
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91
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92 Raise HashMismatch if none match.
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93
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94 """
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95 return self.check_against_chunks(read_chunks(file))
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96
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97 def check_against_path(self, path):
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98 # type: (str) -> None
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99 with open(path, 'rb') as file:
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100 return self.check_against_file(file)
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101
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102 def __nonzero__(self):
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103 # type: () -> bool
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104 """Return whether I know any known-good hashes."""
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105 return bool(self._allowed)
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106
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107 def __bool__(self):
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108 # type: () -> bool
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109 return self.__nonzero__()
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110
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111
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112 class MissingHashes(Hashes):
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113 """A workalike for Hashes used when we're missing a hash for a requirement
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114
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115 It computes the actual hash of the requirement and raises a HashMissing
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116 exception showing it to the user.
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117
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118 """
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119 def __init__(self):
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120 # type: () -> None
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121 """Don't offer the ``hashes`` kwarg."""
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122 # Pass our favorite hash in to generate a "gotten hash". With the
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123 # empty list, it will never match, so an error will always raise.
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124 super(MissingHashes, self).__init__(hashes={FAVORITE_HASH: []})
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125
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126 def _raise(self, gots):
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127 # type: (Dict[str, _Hash]) -> NoReturn
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128 raise HashMissing(gots[FAVORITE_HASH].hexdigest())