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annotate planemo/lib/python3.7/site-packages/galaxy/util/hash_util.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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2 Utility functions for bi-directional Python version compatibility. Python 2.5
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3 introduced hashlib which replaced sha in Python 2.4 and previous versions.
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4 """
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5 from __future__ import absolute_import
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6
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7 import hashlib
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8 import hmac
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9 import logging
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10
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11 from . import smart_str
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12
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13
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14 log = logging.getLogger(__name__)
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15
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16 BLOCK_SIZE = 1024 * 1024
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17
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18 sha1 = hashlib.sha1
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19 sha256 = hashlib.sha256
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20 sha512 = hashlib.sha512
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21 sha = sha1
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22 md5 = hashlib.md5
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23
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24 HASH_NAME_MAP = {
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25 "MD5": md5,
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26 "SHA-1": sha1,
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27 "SHA-256": sha256,
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28 "SHA-512": sha512,
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29 }
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30 HASH_NAMES = list(HASH_NAME_MAP.keys())
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31
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32
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33 def memory_bound_hexdigest(hash_func=None, hash_func_name=None, path=None, file=None):
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34 if hash_func is None:
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35 assert hash_func_name is not None
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36 hash_func = HASH_NAME_MAP[hash_func_name]
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37
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38 hasher = hash_func()
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39 if file is None:
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40 assert path is not None
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41 file = open(path, "rb")
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42 else:
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43 assert path is None, "Cannot specify path and path keyword arguments."
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44
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45 try:
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46 for block in iter(lambda: file.read(BLOCK_SIZE), b''):
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47 hasher.update(block)
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48 return hasher.hexdigest()
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49 finally:
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50 file.close()
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51
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52
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53 def md5_hash_file(path):
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54 """
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55 Return a md5 hashdigest for a file or None if path could not be read.
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56 """
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57 hasher = hashlib.md5()
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58 try:
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59 with open(path, 'rb') as afile:
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60 buf = afile.read()
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61 hasher.update(buf)
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62 return hasher.hexdigest()
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63 except IOError:
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64 # This may happen if path has been deleted
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65 return None
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66
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67
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68 def new_secure_hash(text_type):
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69 """
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70 Returns the hexdigest of the sha1 hash of the argument `text_type`.
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71 """
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72 assert text_type is not None
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73 return sha1(smart_str(text_type)).hexdigest()
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74
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75
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76 def hmac_new(key, value):
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77 return hmac.new(key, value, sha).hexdigest()
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78
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79
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80 def is_hashable(value):
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81 try:
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82 hash(value)
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83 except Exception:
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84 return False
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85 return True
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86
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87
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88 __all__ = ('md5', 'hashlib', 'sha1', 'sha', 'new_secure_hash', 'hmac_new', 'is_hashable')