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"""
SleekXMPP: The Sleek XMPP Library
Copyright (C) 2010 Nathanael C. Fritz
This file is part of SleekXMPP.
See the file license.txt for copying permission.
"""
from . import base
from xml.etree import cElementTree
from xml.parsers.expat import ExpatError
import logging
ignore_ns = False
class MatchXMLMask(base.MatcherBase):
def __init__(self, criteria):
base.MatcherBase.__init__(self, criteria)
if type(criteria) == type(''):
self._criteria = cElementTree.fromstring(self._criteria)
self.default_ns = 'jabber:client'
def setDefaultNS(self, ns):
self.default_ns = ns
def match(self, xml):
if hasattr(xml, 'xml'):
xml = xml.xml
return self.maskcmp(xml, self._criteria, True)
def maskcmp(self, source, maskobj, use_ns=False, default_ns='__no_ns__'):
"""maskcmp(xmlobj, maskobj):
Compare etree xml object to etree xml object mask"""
use_ns = not ignore_ns
#TODO require namespaces
if source == None: #if element not found (happens during recursive check below)
return False
if not hasattr(maskobj, 'attrib'): #if the mask is a string, make it an xml obj
try:
maskobj = cElementTree.fromstring(maskobj)
except ExpatError:
logging.exception( "Expat error parsing: %s", maskobj)
if not use_ns and source.tag.split('}', 1)[-1] != maskobj.tag.split('}', 1)[-1]: # strip off ns and compare
return False
if use_ns and (source.tag != maskobj.tag and "{%s}%s" % (self.default_ns, maskobj.tag) != source.tag ):
return False
if maskobj.text and source.text != maskobj.text:
return False
for attr_name in maskobj.attrib: #compare attributes
if source.attrib.get(attr_name, "__None__") != maskobj.attrib[attr_name]:
return False
#for subelement in maskobj.getiterator()[1:]: #recursively compare subelements
for subelement in maskobj: #recursively compare subelements
if use_ns:
if not self.maskcmp(source.find(subelement.tag), subelement, use_ns):
return False
else:
if not self.maskcmp(self.getChildIgnoreNS(source, subelement.tag), subelement, use_ns):
return False
return True
def getChildIgnoreNS(self, xml, tag):
tag = tag.split('}')[-1]
try:
idx = [c.tag.split('}')[-1] for c in xml.getchildren()].index(tag)
except ValueError:
return None
return xml.getchildren()[idx]
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