apprtc 0.0.0

AppRTC in Rust
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124

# Copyright (C) 2010 Google Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""Utilities for OAuth.

Utilities for making it easier to work with OAuth 2.0
credentials.
"""

__author__ = 'jcgregorio@google.com (Joe Gregorio)'

import os
import stat
import threading

from anyjson import simplejson
from client import Storage as BaseStorage
from client import Credentials


class CredentialsFileSymbolicLinkError(Exception):
  """Credentials files must not be symbolic links."""


class Storage(BaseStorage):
  """Store and retrieve a single credential to and from a file."""

  def __init__(self, filename):
    self._filename = filename
    self._lock = threading.Lock()

  def _validate_file(self):
    if os.path.islink(self._filename):
      raise CredentialsFileSymbolicLinkError(
          'File: %s is a symbolic link.' % self._filename)

  def acquire_lock(self):
    """Acquires any lock necessary to access this Storage.

    This lock is not reentrant."""
    self._lock.acquire()

  def release_lock(self):
    """Release the Storage lock.

    Trying to release a lock that isn't held will result in a
    RuntimeError.
    """
    self._lock.release()

  def locked_get(self):
    """Retrieve Credential from file.

    Returns:
      oauth2client.client.Credentials

    Raises:
      CredentialsFileSymbolicLinkError if the file is a symbolic link.
    """
    credentials = None
    self._validate_file()
    try:
      f = open(self._filename, 'rb')
      content = f.read()
      f.close()
    except IOError:
      return credentials

    try:
      credentials = Credentials.new_from_json(content)
      credentials.set_store(self)
    except ValueError:
      pass

    return credentials

  def _create_file_if_needed(self):
    """Create an empty file if necessary.

    This method will not initialize the file. Instead it implements a
    simple version of "touch" to ensure the file has been created.
    """
    if not os.path.exists(self._filename):
      old_umask = os.umask(0177)
      try:
        open(self._filename, 'a+b').close()
      finally:
        os.umask(old_umask)

  def locked_put(self, credentials):
    """Write Credentials to file.

    Args:
      credentials: Credentials, the credentials to store.

    Raises:
      CredentialsFileSymbolicLinkError if the file is a symbolic link.
    """

    self._create_file_if_needed()
    self._validate_file()
    f = open(self._filename, 'wb')
    f.write(credentials.to_json())
    f.close()

  def locked_delete(self):
    """Delete Credentials file.

    Args:
      credentials: Credentials, the credentials to store.
    """

    os.unlink(self._filename)