first draft of the Xrn class, designed to replace sfa.util.namespace

[sfa.git] / sfa / util / namespace.py

diff --git a/sfa/util/namespace.py b/sfa/util/namespace.py
index cc140d5..961b3b3 100644 (file)
--- a/sfa/util/namespace.py
+++ b/sfa/util/namespace.py
@@ -1,29 +1,72 @@
-### $Id$
-### $URL$
-
+#
+#  WARNING - This file should be soon deprecated in favor of sfa.util.xrn
+#
+#
+#  WARNING - This file should be soon deprecated in favor of sfa.util.xrn
+#
+#
+#  WARNING - This file should be soon deprecated in favor of sfa.util.xrn
+#
+#
+#  WARNING - This file should be soon deprecated in favor of sfa.util.xrn
+#
+#
+#  WARNING - This file should be soon deprecated in favor of sfa.util.xrn
+#
+#
+#  WARNING - This file should be soon deprecated in favor of sfa.util.xrn
+#
+import re
 from sfa.util.faults import *
-
 URN_PREFIX = "urn:publicid:IDN"
 
-def get_leaf(hrn):
-    parts = hrn.split(".")
-    return ".".join(parts[-1:])
+def __get_hierarchy_delim_indexes(hrn):
+    # find all non escaped '.'
+    hierarchy_delim = '([a-zA-Z0-9][\.])'
+    parts = re.findall(hierarchy_delim, hrn)
+    # list of indexes for every  hierarchy delimieter
+    indexes = []
+    for part in parts:
+        indexes.append(hrn.index(part) + 1)
+    return indexes 
 
-def get_authority(hrn):
-    parts = hrn.split(".")
-    return ".".join(parts[:-1])
+def get_leaf(hrn):
+    delim_indexes = __get_hierarchy_delim_indexes(hrn)
+    if not delim_indexes:
+        return hrn
+    
+    last_delim_index = delim_indexes[-1:][0] + 1
+    return hrn[last_delim_index:] 
 
+def get_authority(xrn):
+    hrn, type = urn_to_hrn(xrn)
+    if type and type == 'authority':
+        return hrn
+  
+    delim_indexes = __get_hierarchy_delim_indexes(hrn)
+    if not delim_indexes:
+        return ''
+    last_delim_index = delim_indexes[-1:][0] 
+    return hrn[:last_delim_index] 
+    
 def hrn_to_pl_slicename(hrn):
+    # remove any escaped no alpah numeric characters
+    #hrn = re.sub('\\\[^a-zA-Z0-9]', '', hrn)
+    hrn = re.sub(r'\\(.)', '', hrn)
     parts = hrn.split(".")
     return parts[-2] + "_" + parts[-1]
 
 # assuming hrn is the hrn of an authority, return the plc authority name
 def hrn_to_pl_authname(hrn):
+    # remove any escaped no alpah numeric characters
+    hrn = re.sub(r'\\(.)', '', hrn)
     parts = hrn.split(".")
     return parts[-1]
 
 # assuming hrn is the hrn of an authority, return the plc login_base
 def hrn_to_pl_login_base(hrn):
+    # remove any escaped no alpah numeric characters
+    hrn = re.sub(r'\\(.)', '', hrn)
     return hrn_to_pl_authname(hrn)
 
 def hostname_to_hrn(auth_hrn, login_base, hostname):
@@ -45,7 +88,7 @@ def slicename_to_hrn(auth_hrn, slicename):
 def email_to_hrn(auth_hrn, email):
     parts = email.split("@")
     username = parts[0]
-    username = username.replace(".", "_") 
+    username = username.replace(".", "_").replace("+", "_") 
     person_hrn = ".".join([auth_hrn, username])
     
     return person_hrn 
@@ -61,17 +104,22 @@ def urn_to_hrn(urn):
         return urn, None
 
     name = urn[len(URN_PREFIX):]
-    hrn_parts = name.split("+")
+    urn_parts = name.split("+")
+    type = urn_parts.pop(2)
+    
+         
+    # Remove the authority name (e.g. '.sa')
+    if type == 'authority':
+        urn_parts = urn_parts[:-1]
+
+    # convert hrn_parts (list) into hrn (str) by doing the following
+    # 1. remove blank elements
+    # 2. escape all non alpha numeric chars (excluding ':')
+    # 3. replace ':' with '.'  (':' is the urn hierarchy delimiter)
+    # 4. join list elements using '.' 
+    #hrn = '.'.join([part.replace('.', '\\.').replace(':', '.') for part in hrn_parts if part]) 
+    hrn = '.'.join([re.sub(r'([^a-zA-Z0-9\:])', r'\\\1', part).replace(':', '.') for part in urn_parts if part]) 
     
-    # type is always the second to last element in the list
-    type = hrn_parts.pop(-2)
-
-    # convert hrn_parts (list) into hrn (str) by doing the following    
-    # remove blank elements
-    # replace ':' with '.'
-    # join list elements using '.'
-    hrn = '.'.join([part.replace(':', '.') for part in hrn_parts if part]) 
-   
     return str(hrn), str(type) 
     
     
@@ -83,9 +131,22 @@ def hrn_to_urn(hrn, type=None):
     if not hrn or hrn.startswith(URN_PREFIX):
         return hrn
 
-    authority = get_authority(hrn)
-    name = get_leaf(hrn)
-    urn = "+".join([unicode(part).replace('.', ':') \
-                    for part in ['',authority,type,name]])
+    if type == 'authority':
+        authority = hrn
+        name = 'sa'   
+    else:
+        authority = get_authority(hrn)
+        name = get_leaf(hrn)   
+  
+    # convert from hierarchy delimiter from '.' to ':'   
+    authority = re.sub(r'([a-zA-Z0-9])[\.]', r'\1:', authority) 
+    # unescape escaped characters
+    authority = re.sub(r'\\(.)', r'\1', authority)
+    
+    if type == None:
+        urn = "+".join(['',authority,name])
+    else:
+        urn = "+".join(['',authority,type,name])
 
+        
     return URN_PREFIX + urn