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Relax the digest specification to handle more formats

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This commit is contained in:
Jake Moshenko 2015-11-06 17:47:28 -05:00
parent 4314882fa0
commit 99e5429e86
2 changed files with 18 additions and 31 deletions
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30
digest/digest_tools.py
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@ -3,8 +3,9 @@ import os.path
import hashlib
DIGEST_PATTERN = r'(tarsum\.(v[\w]+)\+)?([\w]+):([0-9a-f]+)'
DIGEST_PATTERN = r'([A-Za-z0-9_+.-]+):([A-Fa-f0-9]+)'
REPLACE_WITH_PATH = re.compile(r'[+.]')
REPLACE_DOUBLE_SLASHES = re.compile(r'/+')
class InvalidDigestException(RuntimeError):
pass
@ -13,15 +14,11 @@ class InvalidDigestException(RuntimeError):
class Digest(object):
DIGEST_REGEX = re.compile(DIGEST_PATTERN)
def __init__(self, hash_alg, hash_bytes, is_tarsum=False, tarsum_version=None):
def __init__(self, hash_alg, hash_bytes):
self._hash_alg = hash_alg
self._hash_bytes = hash_bytes
self._is_tarsum = is_tarsum
self._tarsum_version = tarsum_version
def __str__(self):
if self._is_tarsum:
return 'tarsum.{0}+{1}:{2}'.format(self._tarsum_version, self._hash_alg, self._hash_bytes)
return '{0}:{1}'.format(self._hash_alg, self._hash_bytes)
def __eq__(self, rhs):
@ -34,16 +31,7 @@ class Digest(object):
if match is None or match.end() != len(digest):
raise InvalidDigestException('Not a valid digest: %s', digest)
is_tarsum = match.group(1) is not None
return Digest(match.group(3), match.group(4), is_tarsum, match.group(2))
@property
def is_tarsum(self):
return self._is_tarsum
@property
def tarsum_version(self):
return self._tarsum_version
return Digest(match.group(1), match.group(2))
@property
def hash_alg(self):
@ -59,14 +47,12 @@ def content_path(digest):
parsed = Digest.parse_digest(digest)
components = []
if parsed.is_tarsum:
components.extend(['tarsum', parsed.tarsum_version])
# Generate a prefix which is always two characters, and which will be filled with leading zeros
# if the input does not contain at least two characters. e.g. ABC -> AB, A -> 0A
prefix = parsed.hash_bytes[0:2].zfill(2)
components.extend([parsed.hash_alg, prefix, parsed.hash_bytes])
pathish = REPLACE_WITH_PATH.sub('/', parsed.hash_alg)
normalized = REPLACE_DOUBLE_SLASHES.sub('/', pathish).lstrip('/')
components.extend([normalized, prefix, parsed.hash_bytes])
return os.path.join(*components)