170 lines
7.1 KiB
Python
170 lines
7.1 KiB
Python
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from __future__ import print_function
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import csv
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import hashlib
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import os.path
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import re
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import stat
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import time
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from collections import OrderedDict
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from distutils import log as logger
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from zipfile import ZIP_DEFLATED, ZipInfo, ZipFile
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from wheel.cli import WheelError
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from wheel.util import urlsafe_b64decode, as_unicode, native, urlsafe_b64encode, as_bytes, StringIO
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# Non-greedy matching of an optional build number may be too clever (more
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# invalid wheel filenames will match). Separate regex for .dist-info?
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WHEEL_INFO_RE = re.compile(
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r"""^(?P<namever>(?P<name>.+?)-(?P<ver>.+?))(-(?P<build>\d[^-]*))?
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-(?P<pyver>.+?)-(?P<abi>.+?)-(?P<plat>.+?)\.whl$""",
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re.VERBOSE)
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def get_zipinfo_datetime(timestamp=None):
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# Some applications need reproducible .whl files, but they can't do this without forcing
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# the timestamp of the individual ZipInfo objects. See issue #143.
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timestamp = int(os.environ.get('SOURCE_DATE_EPOCH', timestamp or time.time()))
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return time.gmtime(timestamp)[0:6]
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class WheelFile(ZipFile):
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"""A ZipFile derivative class that also reads SHA-256 hashes from
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.dist-info/RECORD and checks any read files against those.
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"""
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_default_algorithm = hashlib.sha256
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def __init__(self, file, mode='r'):
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basename = os.path.basename(file)
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self.parsed_filename = WHEEL_INFO_RE.match(basename)
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if not basename.endswith('.whl') or self.parsed_filename is None:
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raise WheelError("Bad wheel filename {!r}".format(basename))
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ZipFile.__init__(self, file, mode, compression=ZIP_DEFLATED, allowZip64=True)
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self.dist_info_path = '{}.dist-info'.format(self.parsed_filename.group('namever'))
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self.record_path = self.dist_info_path + '/RECORD'
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self._file_hashes = OrderedDict()
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self._file_sizes = {}
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if mode == 'r':
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# Ignore RECORD and any embedded wheel signatures
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self._file_hashes[self.record_path] = None, None
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self._file_hashes[self.record_path + '.jws'] = None, None
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self._file_hashes[self.record_path + '.p7s'] = None, None
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# Fill in the expected hashes by reading them from RECORD
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try:
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record = self.open(self.record_path)
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except KeyError:
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raise WheelError('Missing {} file'.format(self.record_path))
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with record:
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for line in record:
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line = line.decode('utf-8')
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path, hash_sum, size = line.rsplit(u',', 2)
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if hash_sum:
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algorithm, hash_sum = hash_sum.split(u'=')
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try:
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hashlib.new(algorithm)
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except ValueError:
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raise WheelError('Unsupported hash algorithm: {}'.format(algorithm))
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if algorithm.lower() in {'md5', 'sha1'}:
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raise WheelError(
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'Weak hash algorithm ({}) is not permitted by PEP 427'
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.format(algorithm))
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self._file_hashes[path] = (
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algorithm, urlsafe_b64decode(hash_sum.encode('ascii')))
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def open(self, name_or_info, mode="r", pwd=None):
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def _update_crc(newdata, eof=None):
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if eof is None:
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eof = ef._eof
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update_crc_orig(newdata)
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else: # Python 2
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update_crc_orig(newdata, eof)
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running_hash.update(newdata)
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if eof and running_hash.digest() != expected_hash:
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raise WheelError("Hash mismatch for file '{}'".format(native(ef_name)))
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ef = ZipFile.open(self, name_or_info, mode, pwd)
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ef_name = as_unicode(name_or_info.filename if isinstance(name_or_info, ZipInfo)
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else name_or_info)
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if mode == 'r' and not ef_name.endswith('/'):
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if ef_name not in self._file_hashes:
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raise WheelError("No hash found for file '{}'".format(native(ef_name)))
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algorithm, expected_hash = self._file_hashes[ef_name]
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if expected_hash is not None:
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# Monkey patch the _update_crc method to also check for the hash from RECORD
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running_hash = hashlib.new(algorithm)
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update_crc_orig, ef._update_crc = ef._update_crc, _update_crc
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return ef
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def write_files(self, base_dir):
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logger.info("creating '%s' and adding '%s' to it", self.filename, base_dir)
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deferred = []
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for root, dirnames, filenames in os.walk(base_dir):
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# Sort the directory names so that `os.walk` will walk them in a
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# defined order on the next iteration.
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dirnames.sort()
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for name in sorted(filenames):
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path = os.path.normpath(os.path.join(root, name))
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if os.path.isfile(path):
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arcname = os.path.relpath(path, base_dir)
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if arcname == self.record_path:
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pass
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elif root.endswith('.dist-info'):
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deferred.append((path, arcname))
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else:
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self.write(path, arcname)
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deferred.sort()
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for path, arcname in deferred:
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self.write(path, arcname)
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def write(self, filename, arcname=None, compress_type=None):
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with open(filename, 'rb') as f:
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st = os.fstat(f.fileno())
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data = f.read()
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zinfo = ZipInfo(arcname or filename, date_time=get_zipinfo_datetime(st.st_mtime))
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zinfo.external_attr = (stat.S_IMODE(st.st_mode) | stat.S_IFMT(st.st_mode)) << 16
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zinfo.compress_type = ZIP_DEFLATED
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self.writestr(zinfo, data, compress_type)
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def writestr(self, zinfo_or_arcname, bytes, compress_type=None):
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ZipFile.writestr(self, zinfo_or_arcname, bytes, compress_type)
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fname = (zinfo_or_arcname.filename if isinstance(zinfo_or_arcname, ZipInfo)
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else zinfo_or_arcname)
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logger.info("adding '%s'", fname)
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if fname != self.record_path:
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hash_ = self._default_algorithm(bytes)
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self._file_hashes[fname] = hash_.name, native(urlsafe_b64encode(hash_.digest()))
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self._file_sizes[fname] = len(bytes)
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def close(self):
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# Write RECORD
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if self.fp is not None and self.mode == 'w' and self._file_hashes:
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data = StringIO()
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writer = csv.writer(data, delimiter=',', quotechar='"', lineterminator='\n')
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writer.writerows((
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(
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fname,
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algorithm + "=" + hash_,
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self._file_sizes[fname]
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)
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for fname, (algorithm, hash_) in self._file_hashes.items()
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))
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writer.writerow((format(self.record_path), "", ""))
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zinfo = ZipInfo(native(self.record_path), date_time=get_zipinfo_datetime())
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zinfo.compress_type = ZIP_DEFLATED
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zinfo.external_attr = 0o664 << 16
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self.writestr(zinfo, as_bytes(data.getvalue()))
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ZipFile.close(self)
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