/usr/share/pyshared/keyczar/keydata.py is in python-keyczar 0.6~b.061709+svn502-1.
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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 | #!/usr/bin/python2.4
#
# Copyright 2008 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.
"""
Encodes the two classes storing data about keys:
- KeyMetadata: stores metadata
- KeyVersion: stores key strings and types
@author: arkajit.dey@gmail.com (Arkajit Dey)
"""
try:
import simplejson as json
except ImportError:
import json
import errors
import keyinfo
class KeyMetadata(object):
"""Encodes metadata for a keyset with a name, purpose, type, and versions."""
def __init__(self, name, purpose, type, encrypted=False):
self.name = name
self.purpose = purpose
self.type = type
self.encrypted = encrypted
self.__versions = {} # dictionary from version nums to KeyVersions
versions = property(lambda self: self.__versions.values())
def __str__(self):
return json.dumps({"name": self.name,
"purpose": str(self.purpose),
"type": str(self.type),
"encrypted": self.encrypted,
"versions": [json.loads(str(v)) for v in self.versions]})
def AddVersion(self, version):
"""
Adds given version and returns True if successful.
@param version: version to add
@type version: L{KeyVersion}
@return: True if version was successfully added (i.e. no previous version
had the same version number), False otherwise.
@rtype: boolean
"""
num = version.version_number
if num not in self.__versions:
self.__versions[num] = version
return True
return False
def RemoveVersion(self, version_number):
"""
Removes version with given version number and returns it if it exists.
@param version_number: version number to remove
@type version_number: integer
@return: the removed version if it exists
@rtype: L{KeyVersion}
@raise KeyczarError: if the version number is non-existent
"""
try:
self.__versions.pop(version_number)
except KeyError:
raise errors.KeyczarError("No such version number: %d" % version_number)
def GetVersion(self, version_number):
"""
Return the version corresponding to the given version number.
@param version_number: integer version number of desired version
@type version_number: integer
@return: the corresponding version if it exists
@rtype: L{KeyVersion}
@raise KeyczarError: if the version number is non-existent.
"""
try:
return self.__versions[version_number]
except KeyError:
raise errors.KeyczarError("No such version number: %d" % version_number)
@staticmethod
def Read(json_string):
"""
Return KeyMetadata object constructed from JSON string representation.
@param json_string: a JSON representation of a KeyMetadata object
@type json_string: string
@return: the constructed KeyMetadata object
@rtype: L{KeyMetadata}
"""
meta = json.loads(json_string)
kmd = KeyMetadata(meta['name'], keyinfo.GetPurpose(meta['purpose']),
keyinfo.GetType(meta['type']), meta['encrypted'])
for version in meta['versions']:
kmd.AddVersion(KeyVersion.Read(version))
return kmd
class KeyVersion(object):
def __init__(self, v, s, export):
self.version_number = v
self.__status = s
self.exportable = export
def __SetStatus(self, new_status):
if new_status:
self.__status = new_status
status = property(lambda self: self.__status, __SetStatus)
def __str__(self):
return json.dumps({"versionNumber": self.version_number,
"status": str(self.status),
"exportable": self.exportable})
@staticmethod
def Read(version):
"""
Return KeyVersion object constructed from dictionary derived from JSON.
@param version: a dictionary obtained from a JSON string representation
@type version: dictionary
@return: constructed KeyVersion object
@rtype: L{KeyVersion}
"""
return KeyVersion(version['versionNumber'],
keyinfo.GetStatus(version['status']),
version['exportable'])
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