mirror of
https://github.com/correl/SleekXMPP.git
synced 2024-11-27 19:19:54 +00:00
c8f406d1b3
_setSubText can now handle elements specified by an XPath expression, and will build up the element tree as needed, reusing an existing elements in the path.
638 lines
21 KiB
Python
638 lines
21 KiB
Python
"""
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SleekXMPP: The Sleek XMPP Library
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Copyright (C) 2010 Nathanael C. Fritz
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This file is part of SleekXMPP.
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See the file LICENSE for copying permission.
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"""
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import copy
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import logging
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import sys
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import weakref
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from xml.etree import cElementTree as ET
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from sleekxmpp.xmlstream import JID
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from sleekxmpp.xmlstream.tostring import tostring
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# Used to check if an argument is an XML object.
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XML_TYPE = type(ET.Element('xml'))
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def registerStanzaPlugin(stanza, plugin):
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"""
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Associate a stanza object as a plugin for another stanza.
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Arguments:
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stanza -- The class of the parent stanza.
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plugin -- The class of the plugin stanza.
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"""
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tag = "{%s}%s" % (plugin.namespace, plugin.name)
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stanza.plugin_attrib_map[plugin.plugin_attrib] = plugin
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stanza.plugin_tag_map[tag] = plugin
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class ElementBase(object):
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name = 'stanza'
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plugin_attrib = 'plugin'
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namespace = 'jabber:client'
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interfaces = set(('type', 'to', 'from', 'id', 'payload'))
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types = set(('get', 'set', 'error', None, 'unavailable', 'normal', 'chat'))
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sub_interfaces = tuple()
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plugin_attrib_map = {}
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plugin_tag_map = {}
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subitem = None
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def __init__(self, xml=None, parent=None):
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"""
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Create a new stanza object.
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Arguments:
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xml -- Initialize the stanza with optional existing XML.
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parent -- Optional stanza object that contains this stanza.
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"""
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self.xml = xml
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self.plugins = {}
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self.iterables = []
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self.idx = 0
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if parent is None:
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self.parent = None
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else:
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self.parent = weakref.ref(parent)
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if self.setup(xml):
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# If we generated our own XML, then everything is ready.
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return
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# Initialize values using provided XML
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for child in self.xml.getchildren():
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if child.tag in self.plugin_tag_map:
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plugin = self.plugin_tag_map[child.tag]
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self.plugins[plugin.plugin_attrib] = plugin(child, self)
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if self.subitem is not None:
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for sub in self.subitem:
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if child.tag == "{%s}%s" % (sub.namespace, sub.name):
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self.iterables.append(sub(child, self))
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break
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def setup(self, xml=None):
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"""
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Initialize the stanza's XML contents.
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Will return True if XML was generated according to the stanza's
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definition.
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Arguments:
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xml -- Optional XML object to use for the stanza's content
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instead of generating XML.
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"""
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if self.xml is None:
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self.xml = xml
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if self.xml is None:
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# Generate XML from the stanza definition
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for ename in self.name.split('/'):
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new = ET.Element("{%s}%s" % (self.namespace, ename))
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if self.xml is None:
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self.xml = new
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else:
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last_xml.append(new)
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last_xml = new
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if self.parent is not None:
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self.parent().xml.append(self.xml)
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# We had to generate XML
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return True
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else:
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# We did not generate XML
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return False
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def enable(self, attrib):
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"""
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Enable and initialize a stanza plugin.
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Alias for initPlugin.
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Arguments:
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attrib -- The stanza interface for the plugin.
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"""
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return self.initPlugin(attrib)
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def initPlugin(self, attrib):
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"""
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Enable and initialize a stanza plugin.
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Arguments:
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attrib -- The stanza interface for the plugin.
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"""
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if attrib not in self.plugins:
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plugin_class = self.plugin_attrib_map[attrib]
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self.plugins[attrib] = plugin_class(parent=self)
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return self
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def getStanzaValues(self):
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"""
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Return a dictionary of the stanza's interface values.
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Stanza plugin values are included as nested dictionaries.
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"""
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values = {}
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for interface in self.interfaces:
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values[interface] = self[interface]
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for plugin, stanza in self.plugins.items():
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values[plugin] = stanza.getStanzaValues()
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if self.iterables:
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iterables = []
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for stanza in self.iterables:
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iterables.append(stanza.getStanzaValues())
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iterables[-1].update({
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'__childtag__': "{%s}%s" % (stanza.namespace, stanza.name)
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})
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values['substanzas'] = iterables
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return values
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def setStanzaValues(self, values):
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"""
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Set multiple stanza interface values using a dictionary.
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Stanza plugin values may be set using nested dictionaries.
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Arguments:
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values -- A dictionary mapping stanza interface with values.
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Plugin interfaces may accept a nested dictionary that
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will be used recursively.
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"""
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for interface, value in values.items():
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if interface == 'substanzas':
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for subdict in value:
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if '__childtag__' in subdict:
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for subclass in self.subitem:
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child_tag = "{%s}%s" % (subclass.namespace,
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subclass.name)
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if subdict['__childtag__'] == child_tag:
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sub = subclass(parent=self)
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sub.setStanzaValues(subdict)
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self.iterables.append(sub)
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break
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elif interface in self.interfaces:
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self[interface] = value
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elif interface in self.plugin_attrib_map:
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if interface not in self.plugins:
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self.initPlugin(interface)
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self.plugins[interface].setStanzaValues(value)
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return self
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def __getitem__(self, attrib):
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"""
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Return the value of a stanza interface using dictionary-like syntax.
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Example:
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>>> msg['body']
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'Message contents'
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Stanza interfaces are typically mapped directly to the underlying XML
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object, but can be overridden by the presence of a getAttrib method
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(or getFoo where the interface is named foo, etc).
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The search order for interface value retrieval for an interface
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named 'foo' is:
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1. The list of substanzas.
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2. The result of calling getFoo.
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3. The contents of the foo subelement, if foo is a sub interface.
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4. The value of the foo attribute of the XML object.
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5. The plugin named 'foo'
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6. An empty string.
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Arguments:
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attrib -- The name of the requested stanza interface.
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"""
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if attrib == 'substanzas':
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return self.iterables
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elif attrib in self.interfaces:
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get_method = "get%s" % attrib.title()
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if hasattr(self, get_method):
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return getattr(self, get_method)()
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else:
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if attrib in self.sub_interfaces:
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return self._getSubText(attrib)
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else:
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return self._getAttr(attrib)
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elif attrib in self.plugin_attrib_map:
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if attrib not in self.plugins:
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self.initPlugin(attrib)
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return self.plugins[attrib]
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else:
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return ''
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def __setitem__(self, attrib, value):
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"""
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Set the value of a stanza interface using dictionary-like syntax.
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Example:
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>>> msg['body'] = "Hi!"
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>>> msg['body']
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'Hi!'
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Stanza interfaces are typically mapped directly to the underlying XML
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object, but can be overridden by the presence of a setAttrib method
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(or setFoo where the interface is named foo, etc).
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The effect of interface value assignment for an interface
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named 'foo' will be one of:
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1. Delete the interface's contents if the value is None.
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2. Call setFoo, if it exists.
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3. Set the text of a foo element, if foo is in sub_interfaces.
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4. Set the value of a top level XML attribute name foo.
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5. Attempt to pass value to a plugin named foo using the plugin's
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foo interface.
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6. Do nothing.
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Arguments:
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attrib -- The name of the stanza interface to modify.
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value -- The new value of the stanza interface.
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"""
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if attrib in self.interfaces:
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if value is not None:
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set_method = "set%s" % attrib.title()
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if hasattr(self, set_method):
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getattr(self, set_method)(value,)
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else:
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if attrib in self.sub_interfaces:
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return self._setSubText(attrib, text=value)
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else:
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self._setAttr(attrib, value)
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else:
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self.__delitem__(attrib)
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elif attrib in self.plugin_attrib_map:
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if attrib not in self.plugins:
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self.initPlugin(attrib)
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self.plugins[attrib][attrib] = value
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return self
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def __delitem__(self, attrib):
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"""
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Delete the value of a stanza interface using dictionary-like syntax.
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Example:
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>>> msg['body'] = "Hi!"
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>>> msg['body']
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'Hi!'
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>>> del msg['body']
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>>> msg['body']
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''
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Stanza interfaces are typically mapped directly to the underlyig XML
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object, but can be overridden by the presence of a delAttrib method
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(or delFoo where the interface is named foo, etc).
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The effect of deleting a stanza interface value named foo will be
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one of:
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1. Call delFoo, if it exists.
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2. Delete foo element, if foo is in sub_interfaces.
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3. Delete top level XML attribute named foo.
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4. Remove the foo plugin, if it was loaded.
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5. Do nothing.
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Arguments:
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attrib -- The name of the affected stanza interface.
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"""
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if attrib in self.interfaces:
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del_method = "del%s" % attrib.title()
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if hasattr(self, del_method):
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getattr(self, del_method)()
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else:
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if attrib in self.sub_interfaces:
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return self._delSub(attrib)
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else:
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self._delAttr(attrib)
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elif attrib in self.plugin_attrib_map:
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if attrib in self.plugins:
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del self.plugins[attrib]
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return self
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def _setAttr(self, name, value):
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"""
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Set the value of a top level attribute of the underlying XML object.
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If the new value is None or an empty string, then the attribute will
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be removed.
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Arguments:
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name -- The name of the attribute.
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value -- The new value of the attribute, or None or '' to
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remove it.
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"""
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if value is None or value == '':
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self.__delitem__(name)
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else:
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self.xml.attrib[name] = value
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def _delAttr(self, name):
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"""
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Remove a top level attribute of the underlying XML object.
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Arguments:
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name -- The name of the attribute.
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"""
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if name in self.xml.attrib:
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del self.xml.attrib[name]
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def _getAttr(self, name, default=''):
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"""
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Return the value of a top level attribute of the underlying
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XML object.
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In case the attribute has not been set, a default value can be
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returned instead. An empty string is returned if no other default
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is supplied.
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Arguments:
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name -- The name of the attribute.
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default -- Optional value to return if the attribute has not
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been set. An empty string is returned otherwise.
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"""
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return self.xml.attrib.get(name, default)
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def _getSubText(self, name, default=''):
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"""
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Return the text contents of a sub element.
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In case the element does not exist, or it has no textual content,
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a default value can be returned instead. An empty string is returned
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if no other default is supplied.
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Arguments:
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name -- The name or XPath expression of the element.
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default -- Optional default to return if the element does
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not exists. An empty string is returned otherwise.
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"""
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name = self._fix_ns(name)
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stanza = self.xml.find(name)
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if stanza is None or stanza.text is None:
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return default
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else:
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return stanza.text
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def _setSubText(self, name, text=None, keep=False):
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"""
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Set the text contents of a sub element.
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In case the element does not exist, a element will be created,
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and its text contents will be set.
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If the text is set to an empty string, or None, then the
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element will be removed, unless keep is set to True.
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Arguments:
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name -- The name or XPath expression of the element.
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text -- The new textual content of the element. If the text
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is an empty string or None, the element will be removed
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unless the parameter keep is True.
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keep -- Indicates if the element should be kept if its text is
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removed. Defaults to False.
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"""
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name = self._fix_ns(name)
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element = self.xml.find(name)
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if not text and not keep:
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return self.__delitem__(name)
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if element is None:
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# We need to add the element. If the provided name was
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# an XPath expression, some of the intermediate elements
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# may already exist. If so, we want to use those instead
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# of generating new elements.
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last_xml = self.xml
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walked = []
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for ename in name.split('/'):
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walked.append(ename)
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element = self.xml.find("/".join(walked))
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if element is None:
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element = ET.Element(ename)
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last_xml.append(element)
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last_xml = element
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element = last_xml
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element.text = text
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return element
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@property
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def attrib(self): #backwards compatibility
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return self
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def __iter__(self):
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self.idx = 0
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return self
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def __bool__(self): #python 3.x
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return True
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def __nonzero__(self): #python 2.x
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return True
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def __next__(self):
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self.idx += 1
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if self.idx > len(self.iterables):
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self.idx = 0
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raise StopIteration
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return self.iterables[self.idx - 1]
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def next(self):
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return self.__next__()
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def __len__(self):
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return len(self.iterables)
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def append(self, item):
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if not isinstance(item, ElementBase):
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if type(item) == XML_TYPE:
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return self.appendxml(item)
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else:
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raise TypeError
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self.xml.append(item.xml)
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self.iterables.append(item)
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return self
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def pop(self, idx=0):
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aff = self.iterables.pop(idx)
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self.xml.remove(aff.xml)
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return aff
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def get(self, key, defaultvalue=None):
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value = self[key]
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if value is None or value == '':
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return defaultvalue
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return value
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def keys(self):
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out = []
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out += [x for x in self.interfaces]
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out += [x for x in self.plugins]
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if self.iterables:
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out.append('substanzas')
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return tuple(out)
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def match(self, matchstring):
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if isinstance(matchstring, str):
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nodes = matchstring.split('/')
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else:
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nodes = matchstring
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tagargs = nodes[0].split('@')
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if tagargs[0] not in (self.plugins, self.plugin_attrib): return False
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founditerable = False
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for iterable in self.iterables:
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if nodes[1:] == []:
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break
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founditerable = iterable.match(nodes[1:])
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if founditerable: break;
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for evals in tagargs[1:]:
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x,y = evals.split('=')
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if self[x] != y: return False
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if not founditerable and len(nodes) > 1:
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next = nodes[1].split('@')[0]
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if next in self.plugins:
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return self.plugins[next].match(nodes[1:])
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else:
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return False
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return True
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def find(self, xpath): # for backwards compatiblity, expose elementtree interface
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return self.xml.find(xpath)
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def findall(self, xpath):
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return self.xml.findall(xpath)
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def __eq__(self, other):
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if not isinstance(other, ElementBase):
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return False
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values = self.getStanzaValues()
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for key in other:
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if key not in values or values[key] != other[key]:
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return False
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return True
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def _delSub(self, name):
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if '}' not in name:
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name = "{%s}%s" % (self.namespace, name)
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for child in self.xml.getchildren():
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if child.tag == name:
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self.xml.remove(child)
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def appendxml(self, xml):
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self.xml.append(xml)
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return self
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def __copy__(self):
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return self.__class__(xml=copy.deepcopy(self.xml), parent=self.parent)
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def __str__(self):
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return tostring(self.xml, xmlns='', stanza_ns=self.namespace)
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def __repr__(self):
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return self.__str__()
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def _fix_ns(self, xpath):
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"""
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Apply the stanza's namespace to elements in an XPath expression.
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Arguments:
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xpath -- The XPath expression to fix with namespaces.
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"""
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def fix_ns(name):
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"""Apply namespace to an element if needed."""
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if "}" in name:
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return name
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return "{%s}%s" % (self.namespace, name)
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return "/".join(map(fix_ns, xpath.split("/")))
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#def __del__(self): #prevents garbage collection of reference cycle
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# if self.parent is not None:
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# self.parent.xml.remove(self.xml)
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class StanzaBase(ElementBase):
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name = 'stanza'
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namespace = 'jabber:client'
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interfaces = set(('type', 'to', 'from', 'id', 'payload'))
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types = set(('get', 'set', 'error', None, 'unavailable', 'normal', 'chat'))
|
|
sub_interfaces = tuple()
|
|
|
|
def __init__(self, stream=None, xml=None, stype=None, sto=None, sfrom=None, sid=None):
|
|
self.stream = stream
|
|
if stream is not None:
|
|
self.namespace = stream.default_ns
|
|
ElementBase.__init__(self, xml)
|
|
if stype is not None:
|
|
self['type'] = stype
|
|
if sto is not None:
|
|
self['to'] = sto
|
|
if sfrom is not None:
|
|
self['from'] = sfrom
|
|
self.tag = "{%s}%s" % (self.namespace, self.name)
|
|
|
|
def setType(self, value):
|
|
if value in self.types:
|
|
self.xml.attrib['type'] = value
|
|
return self
|
|
|
|
def getPayload(self):
|
|
return self.xml.getchildren()
|
|
|
|
def setPayload(self, value):
|
|
self.xml.append(value)
|
|
return self
|
|
|
|
def delPayload(self):
|
|
self.clear()
|
|
return self
|
|
|
|
def clear(self):
|
|
for child in self.xml.getchildren():
|
|
self.xml.remove(child)
|
|
for plugin in list(self.plugins.keys()):
|
|
del self.plugins[plugin]
|
|
return self
|
|
|
|
def reply(self):
|
|
# if it's a component, use from
|
|
if self.stream and hasattr(self.stream, "is_component") and self.stream.is_component:
|
|
self['from'], self['to'] = self['to'], self['from']
|
|
else:
|
|
self['to'] = self['from']
|
|
del self['from']
|
|
self.clear()
|
|
return self
|
|
|
|
def error(self):
|
|
self['type'] = 'error'
|
|
return self
|
|
|
|
def getTo(self):
|
|
return JID(self._getAttr('to'))
|
|
|
|
def setTo(self, value):
|
|
return self._setAttr('to', str(value))
|
|
|
|
def getFrom(self):
|
|
return JID(self._getAttr('from'))
|
|
|
|
def setFrom(self, value):
|
|
return self._setAttr('from', str(value))
|
|
|
|
def unhandled(self):
|
|
pass
|
|
|
|
def exception(self, e):
|
|
logging.exception('Error handling {%s}%s stanza' % (self.namespace, self.name))
|
|
|
|
def send(self):
|
|
self.stream.sendRaw(self.__str__())
|
|
|
|
def __copy__(self):
|
|
return self.__class__(xml=copy.deepcopy(self.xml), stream=self.stream)
|
|
|
|
def __str__(self):
|
|
return tostring(self.xml, xmlns='', stanza_ns=self.namespace, stream=self.stream)
|