75 lines
2.7 KiB
Python
75 lines
2.7 KiB
Python
import copy
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import hashlib
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import os
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import pathlib
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import zlib
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##
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import aif.constants_fallback
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class Hash(object):
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def __init__(self, hash_algos = None, *args, **kwargs):
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self.hashers = None
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self.valid_hashtypes = list(aif.constants_fallback.HASH_SUPPORTED_TYPES)
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self.hash_algos = hash_algos
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self.configure()
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def configure(self, *args, **kwargs):
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self.hashers = {}
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if self.hash_algos:
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if not isinstance(self.hash_algos, list):
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self.hash_algos = [self.hash_algos]
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else:
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self.hash_algos = copy.deepcopy(self.valid_hashtypes)
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for h in self.hash_algos:
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if h not in self.valid_hashtypes:
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raise ValueError('Hash algorithm not supported')
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if h not in aif.constants_fallback.HASH_EXTRA_SUPPORTED_TYPES:
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hasher = hashlib.new(h)
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else: # adler32 and crc32
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hasher = getattr(zlib, h)
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self.hashers[h] = hasher
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return()
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def hashData(self, data, *args, **kwargs):
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results = {}
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if not self.hashers or not self.hash_algos:
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self.configure()
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for hashtype, hasher in self.hashers.items():
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if hashtype in aif.constants_fallback.HASH_EXTRA_SUPPORTED_TYPES:
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results[hashtype] = hasher(data)
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else:
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hasher.update(data)
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results[hashtype] = hasher.hexdigest()
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return(results)
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def hashFile(self, file_path, *args, **kwargs):
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if not isinstance(file_path, (str, pathlib.Path, pathlib.PurePath)):
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raise ValueError('file_path must be a path expression')
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file_path = str(file_path)
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with open(file_path, 'rb') as fh:
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results = self.hashData(fh.read())
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return(results)
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def verifyData(self, data, checksum, checksum_type, *args, **kwargs):
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if isinstance(data, str):
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data = data.encode('utf-8')
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if not isinstance(checksum, str):
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checksum = checksum.decode('utf-8')
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if checksum_type not in self.hash_algos:
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raise ValueError('Hash algorithm not supported; try reconfiguring')
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self.configure()
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cksum = self.hashData(data)
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cksum_htype = cksum[checksum_type]
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if cksum == checksum:
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result = True
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else:
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result = False
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return(result)
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def verifyFile(self, filepath, checksum, checksum_type, *args, **kwargs):
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filepath = os.path.abspath(os.path.expanduser(filepath))
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with open(filepath, 'rb') as fh:
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result = self.verifyData(fh.read(), checksum, checksum_type, **kwargs)
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return(result)
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