+#----------------------------------------------------------------------
+# Copyright (c) 2008 Board of Trustees, Princeton University
+#
+# Permission is hereby granted, free of charge, to any person obtaining
+# a copy of this software and/or hardware specification (the "Work") to
+# deal in the Work without restriction, including without limitation the
+# rights to use, copy, modify, merge, publish, distribute, sublicense,
+# and/or sell copies of the Work, and to permit persons to whom the Work
+# is furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Work.
+#
+# THE WORK IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+# HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE WORK OR THE USE OR OTHER DEALINGS
+# IN THE WORK.
+#----------------------------------------------------------------------
+
import re
from sfa.util.faults import *
def get_authority(hrn): return Xrn(hrn).get_authority_hrn()
def urn_to_hrn(urn): xrn=Xrn(urn); return (xrn.hrn, xrn.type)
def hrn_to_urn(hrn,type): return Xrn(hrn, type=type).urn
+def hrn_authfor_hrn(parenthrn, hrn): return Xrn.hrn_is_auth_for_hrn(parenthrn, hrn)
def urn_to_sliver_id(urn, slice_id, node_id, index=0):
- return ":".join([urn, str(slice_id), str(node_id), str(index)])
+ return ":".join(map(str, [urn, slice_id, node_id, index]))
class Xrn:
# e.g. escape ('a.b') -> 'a\.b'
@staticmethod
def escape(token): return re.sub(r'([^\\])\.', r'\1\.', token)
+
# e.g. unescape ('a\.b') -> 'a.b'
@staticmethod
def unescape(token): return token.replace('\\.','.')
-
+
+ # Return the HRN authority chain from top to bottom.
+ # e.g. hrn_auth_chain('a\.b.c.d') -> ['a\.b', 'a\.b.c']
+ @staticmethod
+ def hrn_auth_chain(hrn):
+ parts = Xrn.hrn_auth_list(hrn)
+ chain = []
+ for i in range(len(parts)):
+ chain.append('.'.join(parts[:i+1]))
+ # Include the HRN itself?
+ #chain.append(hrn)
+ return chain
+
+ # Is the given HRN a true authority over the namespace of the other
+ # child HRN?
+ # A better alternative than childHRN.startswith(parentHRN)
+ # e.g. hrn_is_auth_for_hrn('a\.b', 'a\.b.c.d') -> True,
+ # but hrn_is_auth_for_hrn('a', 'a\.b.c.d') -> False
+ # Also hrn_is_uauth_for_hrn('a\.b.c.d', 'a\.b.c.d') -> True
+ @staticmethod
+ def hrn_is_auth_for_hrn(parenthrn, hrn):
+ if parenthrn == hrn:
+ return True
+ for auth in Xrn.hrn_auth_chain(hrn):
+ if parenthrn == auth:
+ return True
+ return False
+
URN_PREFIX = "urn:publicid:IDN"
########## basic tools on URNs