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path: root/src/cryptography/hazmat/primitives/twofactor/utils.py
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from __future__ import unicode_literals

import base64

from six.moves.urllib.parse import quote, urlencode


def generate_uri(hotp, type_name, account_name, issuer, extra_parameters):
    parameters = [
        ('digits', hotp._length),
        ('secret', base64.b32encode(hotp._key)),
        ('algorithm', hotp._algorithm.name.upper()),
    ]

    if issuer is not None:
        parameters.append(('issuer', issuer))

    parameters.extend(extra_parameters)

    uriparts = {
        'type': type_name,
        'label': ('%s:%s' % (quote(issuer), quote(account_name)) if issuer
                  else quote(account_name)),
        'parameters': urlencode(parameters),
    }
    return 'otpauth://{type}/{label}?{parameters}'.format(**uriparts)