Method create

pex/pep_376.py:47–60

(cls, hasher)

class Hash(object):
    @classmethod
    def create(cls, hasher):
        # type: (Hasher) -> Hash

        # The fingerprint encoding is defined for PEP-376 RECORD files as `urlsafe-base64-nopad`
        # which is fully spelled out in code in PEP-427:
        # + https://peps.python.org/pep-0376/#record
        # + https://peps.python.org/pep-0427/#appendix
        fingerprint = base64.urlsafe_b64encode(hasher.digest()).rstrip(b"=")

        # N.B.: The algorithm is all caps under Python 2.7, but lower case under Python 3; so we
        # normalize.
        alg = hasher.name.lower()

        return cls(value="{alg}={hash}".format(alg=alg, hash=fingerprint.decode("ascii")))

    value = attr.ib()  # type: str