Gestionnaire de fichiers - Editer - /usr/lib/python2.7/site-packages/keyczar/keydata.py
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# # 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, key_type, encrypted=False): self.name = name self.purpose = purpose self.type = key_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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