PyNDN: Finishing basic implementation of PyNDN emulation
Not yet fully tested
Refs #1010 (http://redmine.named-data.net/issues/1010)
diff --git a/PyNDN/Data.py b/PyNDN/Data.py
new file mode 100644
index 0000000..8d92201
--- /dev/null
+++ b/PyNDN/Data.py
@@ -0,0 +1,126 @@
+## -*- Mode: python; py-indent-offset: 4; indent-tabs-mode: nil; coding: utf-8; -*-
+#
+# Copyright (c) 2011-2013, Regents of the University of California
+# Alexander Afanasyev
+#
+# GNU 3.0 license, See the LICENSE file for more information
+#
+# Author: Alexander Afanasyev <alexander.afanasyev@ucla.edu>
+#
+
+#
+# Based on PyCCN code, copyrighted and licensed as follows
+#
+# Copyright (c) 2011-2013, Regents of the University of California
+# BSD license, See the COPYING file for more information
+# Written by: Derek Kulinski <takeda@takeda.tk>
+# Jeff Burke <jburke@ucla.edu>
+#
+
+import ns.ndnSIM
+from Name import Name
+
+class Data (object):
+ _data = None
+
+ def __init__(self,
+ name = None, content = None, signed_info = None,
+ data = None):
+ if data:
+ if type (data) is Data:
+ self._data = data._data
+ elif type (data) is ns.ndnSIM.ndn.ContentObject:
+ self._data = data
+ else:
+ raise TypeError ("Invalid type supplied for 'data' parameter [%s]" % type (data))
+ else:
+ self._data = ns.ndnSIM.ndn.ContentObject ()
+
+ self.name = name
+ self.content = content
+ self.signedInfo = signed_info or SignedInfo ()
+
+ def sign (self, key):
+ """There is no actual signing in ndnSIM for now, but we will assign signature bits based on key"""
+ self._data.SetSignature (key.fakeKey)
+
+ def verify_signature (self, key):
+ """There is no actual signing in ndnSIM for now, but we will check if signature matches the key"""
+ return self._data.GetSignature () == key.fakeKey
+
+ def __getattr__ (self, name):
+ if name == "signedInfo":
+ return object.__getattr__ (self, name)
+ elif name == "name":
+ return Name (self._data.GetName ())
+ elif name == "scope":
+ return self._data.GetScope ()
+ elif name == "interestLifetime":
+ return self._data.GetInterestLifetime ().ToDouble (ns.core.Time.S)
+ else:
+ return self._data.__getattribute__ (name)
+
+ def __setattr__(self, name, value):
+ if name == "_data":
+ return object.__setattr__ (self, name, value)
+ elif name == 'signedInfo':
+ if not value:
+ return
+ if type (value) is SignedInfo:
+ object.__setattr__ (self, name, value)
+
+ if value.timestamp:
+ pass
+ if value.freshnessSeconds:
+ pass
+ if value.keyLocator:
+ pass
+ else:
+ raise TypeError ("signedInfo can be assigned either None or SignedInfo object, [%s] supplied" % type (value))
+ elif name == "name":
+ if not value:
+ return self._data.SetName (ns.ndnSIM.ndn.Name ())
+ elif type (value) is Name:
+ return self._data.SetName (value._name)
+ elif type (value) is ns.ndnSIM.ndn.Name:
+ return self._data.SetName (value)
+ elif type (value) is str:
+ return self._data.SetName (ns.ndnSIM.ndn.Name (value))
+ else:
+ raise ValueError ("Invalid name parameter")
+ elif name == "content":
+ if not value:
+ pkt = ns.network.Packet ()
+ self._data.SetPayload (pkt)
+ else:
+ pkt = ns.network.Packet (bytes (value))
+ self._data.SetPayload (pkt)
+ else:
+ raise NameError ("Unknown attribute [%s]" % name)
+
+ def __repr__(self):
+ return "ndn.Data(%s)" % str (self._data)
+
+class SignedInfo (object):
+ def __init__(self, keyLocator = None, freshness = None, timestamp = None):
+
+ self.timestamp = timestamp
+ self.freshnessSeconds = freshness
+ self.keyLocator = keyLocator
+
+ def __repr__(self):
+ args = []
+
+ if self.keyLocator is not None:
+ args += ["keyLocator=%r" % self.keyLocator]
+ if self.freshnessSeconds is not None:
+ args += ["freshness=%r" % self.freshnessSeconds]
+ if self.timeStamp is not None:
+ args += ["timestamp=%r" % self.timestamp]
+
+ return "ndn.SignedInfo(%s)" % ", ".join(args)
+
+class ContentObject (Data):
+ """For backwards compatibility"""
+ pass
+