1# -*- coding: utf-8 -*- #
2# Copyright 2014 Google LLC. All Rights Reserved.
3#
4# Licensed under the Apache License, Version 2.0 (the "License");
5# you may not use this file except in compliance with the License.
6# You may obtain a copy of the License at
7#
8#    http://www.apache.org/licenses/LICENSE-2.0
9#
10# Unless required by applicable law or agreed to in writing, software
11# distributed under the License is distributed on an "AS IS" BASIS,
12# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13# See the License for the specific language governing permissions and
14# limitations under the License.
15
16"""A module for generating resource names."""
17
18from __future__ import absolute_import
19from __future__ import division
20from __future__ import unicode_literals
21
22import io
23import random
24import string
25import six
26from six.moves import range  # pylint: disable=redefined-builtin
27
28_LENGTH = 12
29_BEGIN_ALPHABET = string.ascii_lowercase
30_ALPHABET = _BEGIN_ALPHABET + string.digits
31
32
33def GenerateRandomName():
34  """Generates a random string.
35
36  Returns:
37    The returned string will be 12 characters long and will begin with
38    a lowercase letter followed by 11 characters drawn from the set
39    [a-z0-9].
40  """
41  buf = io.StringIO()
42  buf.write(six.text_type(random.choice(_BEGIN_ALPHABET)))
43  for _ in range(_LENGTH - 1):
44    buf.write(six.text_type(random.choice(_ALPHABET)))
45  return buf.getvalue()
46