def set_chksum(self, doc, chk_sum):
"""
Sets the external document reference's check sum, if not already set.
chk_sum - The checksum value in the form of a string.
"""
if chk_sum:
doc.ext_document_references[-1].check_sum = checksum.Algorithm(
'SHA1', chk_sum)
else:
raise SPDXValueError('ExternalDocumentRef::Checksum')
def checksum_from_sha1(value):
"""Returns an spdx.checksum.Algorithm instance representing the SHA1
checksum. Returns None if doesn't match CHECKSUM_RE.
"""
# More constrained regex at lexer level
CHECKSUM_RE = re.compile('SHA1:(.+)', re.UNICODE)
match = CHECKSUM_RE.match(value)
if match:
return checksum.Algorithm(identifier='SHA1', value=match.group(1))
else:
return None
def set_pkg_chk_sum(self, doc, chk_sum):
"""Sets the package check sum, if not already set.
chk_sum - A string
Raises CardinalityError if already defined.
Raises OrderError if no package previously defined.
"""
self.assert_package_exists()
if not self.package_chk_sum_set:
self.package_chk_sum_set = True
doc.package.check_sum = checksum.Algorithm('SHA1', chk_sum)
else:
raise CardinalityError('Package::CheckSum')
def set_file_chksum(self, doc, chk_sum):
"""Sets the file check sum, if not already set.
chk_sum - A string
Raises CardinalityError if already defined.
Raises OrderError if no package previously defined.
"""
if self.has_package(doc) and self.has_file(doc):
if not self.file_chksum_set:
self.file_chksum_set = True
self.file(doc).chk_sum = checksum.Algorithm('SHA1', chk_sum)
return True
else:
raise CardinalityError('File::CheckSum')
else:
raise OrderError('File::CheckSum')
