How to use the wheel.util.urlsafe_b64encode function in wheel

def sign(payload, keypair):
    """Return a JWS-JS format signature given a JSON-serializable payload and
    an Ed25519 keypair."""
    get_ed25519ll()
    #
    header = {
                "alg": ALG,
                "jwk": {
                    "kty": ALG,  # alg -> kty in jwk-08.
                    "vk": native(urlsafe_b64encode(keypair.vk))
                }
             }

    encoded_header = urlsafe_b64encode(binary(json.dumps(header, sort_keys=True)))
    encoded_payload = urlsafe_b64encode(binary(json.dumps(payload, sort_keys=True)))
    secured_input = b".".join((encoded_header, encoded_payload))
    sig_msg = ed25519ll.crypto_sign(secured_input, keypair.sk)
    signature = sig_msg[:ed25519ll.SIGNATUREBYTES]
    encoded_signature = urlsafe_b64encode(signature)

    return {"recipients":
            [{"header": native(encoded_header),
              "signature": native(encoded_signature)}],
            "payload": native(encoded_payload)}

def writestr(self, zinfo_or_arcname, bytes, compress_type=None):
        ZipFile.writestr(self, zinfo_or_arcname, bytes, compress_type)
        fname = (zinfo_or_arcname.filename if isinstance(zinfo_or_arcname, ZipInfo)
                 else zinfo_or_arcname)
        logger.info("adding '%s'", fname)
        if fname != self.record_path:
            hash_ = self._default_algorithm(bytes)
            self._file_hashes[fname] = hash_.name, native(urlsafe_b64encode(hash_.digest()))
            self._file_sizes[fname] = len(bytes)

def writestr(self, zinfo_or_arcname, bytes, compress_type=None):
        ZipFile.writestr(self, zinfo_or_arcname, bytes, compress_type)
        fname = (zinfo_or_arcname.filename if isinstance(zinfo_or_arcname, ZipInfo)
                 else zinfo_or_arcname)
        logger.info("adding '%s'", fname)
        if fname != self.record_path:
            hash_ = self._default_algorithm(bytes)
            self._file_hashes[fname] = hash_.name, native(urlsafe_b64encode(hash_.digest()))
            self._file_sizes[fname] = len(bytes)

def skip(path):
        """Wheel hashes every possible file."""
        return path == record_relpath

    with open(record_path, 'w+', newline='', encoding='utf-8') as record_file:
        writer = csv.writer(record_file)
        for path in walk():
            relative_path = relpath(path, bdist_dir)
            if skip(relative_path):
                hash = ''
                size = ''
            else:
                with open(path, 'rb') as f:
                    data = f.read()
                digest = hashlib.sha256(data).digest()
                hash = 'sha256=' + native(urlsafe_b64encode(digest))
                size = len(data)
            record_path = relpath(path, bdist_dir).replace(psep, '/')
            writer.writerow((record_path, hash, size))

def writestr(self, zinfo_or_arcname, bytes, compress_type=None):
        ZipFile.writestr(self, zinfo_or_arcname, bytes, compress_type)
        fname = (zinfo_or_arcname.filename if isinstance(zinfo_or_arcname, ZipInfo)
                 else zinfo_or_arcname)
        logger.info("adding '%s'", fname)
        if fname != self.record_path:
            hash_ = self._default_algorithm(bytes)
            self._file_hashes[fname] = hash_.name, native(urlsafe_b64encode(hash_.digest()))
            self._file_sizes[fname] = len(bytes)

every file in the archive (e.g. with extractall)."""
        sig = None
        if zipfile is None:
            zipfile = self.zipfile
        zipfile.strict = True

        record_name = '/'.join((self.distinfo_name, 'RECORD'))
        sig_name = '/'.join((self.distinfo_name, 'RECORD.jws'))
        # tolerate s/mime signatures:
        smime_sig_name = '/'.join((self.distinfo_name, 'RECORD.p7s'))
        zipfile.set_expected_hash(record_name, None)
        zipfile.set_expected_hash(sig_name, None)
        zipfile.set_expected_hash(smime_sig_name, None)
        record = zipfile.read(record_name)

        record_digest = urlsafe_b64encode(hashlib.sha256(record).digest())
        try:
            sig = from_json(native(zipfile.read(sig_name)))
        except KeyError:  # no signature
            pass
        if sig:
            headers, payload = signatures.verify(sig)
            if payload['hash'] != "sha256=" + native(record_digest):
                msg = "RECORD.jws claimed RECORD hash {} != computed hash {}."
                raise BadWheelFile(msg.format(payload['hash'],
                                              native(record_digest)))

        reader = csv.reader((native(r, 'utf-8') for r in record.splitlines()))

        for row in reader:
            filename = row[0]
            hash = row[1]

def sign(payload, keypair):
    """Return a JWS-JS format signature given a JSON-serializable payload and
    an Ed25519 keypair."""
    get_ed25519ll()
    #
    header = {
                "alg": ALG,
                "jwk": {
                    "kty": ALG,  # alg -> kty in jwk-08.
                    "vk": native(urlsafe_b64encode(keypair.vk))
                }
             }

    encoded_header = urlsafe_b64encode(binary(json.dumps(header, sort_keys=True)))
    encoded_payload = urlsafe_b64encode(binary(json.dumps(payload, sort_keys=True)))
    secured_input = b".".join((encoded_header, encoded_payload))
    sig_msg = ed25519ll.crypto_sign(secured_input, keypair.sk)
    signature = sig_msg[:ed25519ll.SIGNATUREBYTES]
    encoded_signature = urlsafe_b64encode(signature)

    return {"recipients":
            [{"header": native(encoded_header),
              "signature": native(encoded_signature)}],
            "payload": native(encoded_payload)}

def _record_digest(self, data):
        '''Returns a three tuple of hash, size and digest.'''

        from wheel.util import urlsafe_b64encode

        digest = hashlib.sha256(data).digest()
        hash_text = 'sha256=' + native(urlsafe_b64encode(digest))
        size = len(data)
        return (hash_text, size, digest)

def skip(path):
            """Wheel hashes every possible file."""
            return (path == record_relpath)

        with open_for_csv(record_path, 'w+') as record_file:
            writer = csv.writer(record_file)
            for path in walk():
                relpath = os.path.relpath(path, bdist_dir)
                if skip(relpath):
                    hash = ''
                    size = ''
                else:
                    with open(path, 'rb') as f:
                        data = f.read()
                    digest = hashlib.sha256(data).digest()
                    hash = 'sha256=' + native(urlsafe_b64encode(digest))
                    size = len(data)
                record_path = os.path.relpath(
                    path, bdist_dir).replace(os.path.sep, '/')
                writer.writerow((record_path, hash, size))

def get_sha(data):
    return urlsafe_b64encode(sha256(data).digest())