+
+def urn_to_hrn(urn):
+ """
+ convert a urn to hrn
+ return a tuple (hrn, type)
+ """
+
+ # if this is already a hrn dont do anything
+ if not urn or not urn.startswith(URN_PREFIX):
+ return urn, None
+
+ name = urn[len(URN_PREFIX):]
+ hrn_parts = name.split("+")
+ type = hrn_parts.pop(2)
+
+
+ # Remove the authority name (e.g. '.sa')
+ if type == 'authority':
+ hrn_parts = hrn_parts[:-1]
+
+ # convert hrn_parts (list) into hrn (str) by doing the following
+ # 1. remove blank elements
+ # 2. escape '.' # '.' exists in protogeni object names and are not delimiters
+ # 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])
+
+ return str(hrn), str(type)
+
+
+def hrn_to_urn(hrn, type=None):
+ """
+ convert an hrn and type to a urn string
+ """
+ # if this is already a urn dont do anything
+ if not hrn or hrn.startswith(URN_PREFIX):
+ return hrn
+
+ if type == 'authority':
+ authority = hrn
+ name = 'sa'
+ else:
+ authority = get_authority(hrn)
+ name = get_leaf(hrn)
+
+ # We have to do the following conversion
+ # '\\.' -> '.' # where '.' belongs in the urn name
+ # '.' -> ':" # where ':' is the urn hierarchy delimiter
+ # by doing the following
+ # 1. split authority around '\\.'
+ # 2. replace '.' with ':' in all parts
+ # 3. join parts around '.'
+ parts = authority.split('\\.')
+ authority = '.'.join([part.replace('.', ':') for part in parts])
+
+ if type == None:
+ urn = "+".join(['',authority,name])
+ else:
+ urn = "+".join(['',authority,type,name])
+
+
+ return URN_PREFIX + urn