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# Slixmpp: The Slick XMPP Library
# Copyright (C) 2010 Nathanael C. Fritz
# This file is part of Slixmpp.
# See the file LICENSE for copying permission.
import logging
from xml.parsers.expat import ExpatError
from slixmpp.xmlstream.stanzabase import ET
from slixmpp.xmlstream.matcher.base import MatcherBase
log = logging.getLogger(__name__)
class MatchXMLMask(MatcherBase):
"""
The XMLMask matcher selects stanzas whose XML matches a given
XML pattern, or mask. For example, message stanzas with body elements
could be matched using the mask:
.. code-block:: xml
<message xmlns="jabber:client"><body /></message>
Use of XMLMask is discouraged, and
:class:`~slixmpp.xmlstream.matcher.xpath.MatchXPath` or
:class:`~slixmpp.xmlstream.matcher.stanzapath.StanzaPath`
should be used instead.
:param criteria: Either an :class:`~xml.etree.ElementTree.Element` XML
object or XML string to use as a mask.
"""
def __init__(self, criteria, default_ns='jabber:client'):
MatcherBase.__init__(self, criteria)
if isinstance(criteria, str):
self._criteria = ET.fromstring(self._criteria)
self.default_ns = default_ns
def setDefaultNS(self, ns):
"""Set the default namespace to use during comparisons.
:param ns: The new namespace to use as the default.
"""
self.default_ns = ns
def match(self, xml):
"""Compare a stanza object or XML object against the stored XML mask.
Overrides MatcherBase.match.
:param xml: The stanza object or XML object to compare against.
"""
if hasattr(xml, 'xml'):
xml = xml.xml
return self._mask_cmp(xml, self._criteria, True)
def _mask_cmp(self, source, mask, use_ns=False, default_ns='__no_ns__'):
"""Compare an XML object against an XML mask.
:param source: The :class:`~xml.etree.ElementTree.Element` XML object
to compare against the mask.
:param mask: The :class:`~xml.etree.ElementTree.Element` XML object
serving as the mask.
:param use_ns: Indicates if namespaces should be respected during
the comparison.
:default_ns: The default namespace to apply to elements that
do not have a specified namespace.
Defaults to ``"__no_ns__"``.
"""
if source is None:
# If the element was not found. May happen during recursive calls.
return False
# Convert the mask to an XML object if it is a string.
if not hasattr(mask, 'attrib'):
try:
mask = ET.fromstring(mask)
except ExpatError:
log.warning("Expat error: %s\nIn parsing: %s", '', mask)
mask_ns_tag = "{%s}%s" % (self.default_ns, mask.tag)
if source.tag not in [mask.tag, mask_ns_tag]:
return False
# If the mask includes text, compare it.
if mask.text and source.text and \
source.text.strip() != mask.text.strip():
return False
# Compare attributes. The stanza must include the attributes
# defined by the mask, but may include others.
for name, value in mask.attrib.items():
if source.attrib.get(name, "__None__") != value:
return False
# Recursively check subelements.
matched_elements = {}
for subelement in mask:
matched = False
for other in source.findall(subelement.tag):
matched_elements[other] = False
if self._mask_cmp(other, subelement, use_ns):
if not matched_elements.get(other, False):
matched_elements[other] = True
matched = True
if not matched:
return False
# Everything matches.
return True
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