1310 lines
47 KiB
Python
1310 lines
47 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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from sleekxmpp.thirdparty import OrderedDict
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log = logging.getLogger(__name__)
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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 register_stanza_plugin(stanza, plugin, iterable=False, overrides=False):
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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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iterable -- Indicates if the plugin stanza should be
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included in the parent stanza's iterable
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'substanzas' interface results.
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overrides -- Indicates if the plugin should be allowed
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to override the interface handlers for
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the parent 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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if iterable:
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# Prevent weird memory reference gotchas.
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stanza.plugin_iterables = stanza.plugin_iterables.copy()
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stanza.plugin_iterables.add(plugin)
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if overrides:
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# Prevent weird memory reference gotchas.
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stanza.plugin_overrides = stanza.plugin_overrides.copy()
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for interface in plugin.overrides:
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stanza.plugin_overrides[interface] = plugin.plugin_attrib
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# To maintain backwards compatibility for now, preserve the camel case name.
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registerStanzaPlugin = register_stanza_plugin
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class ElementBase(object):
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"""
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The core of SleekXMPP's stanza XML manipulation and handling is provided
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by ElementBase. ElementBase wraps XML cElementTree objects and enables
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access to the XML contents through dictionary syntax, similar in style
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to the Ruby XMPP library Blather's stanza implementation.
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Stanzas are defined by their name, namespace, and interfaces. For
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example, a simplistic Message stanza could be defined as:
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>>> class Message(ElementBase):
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... name = "message"
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... namespace = "jabber:client"
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... interfaces = set(('to', 'from', 'type', 'body'))
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... sub_interfaces = set(('body',))
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The resulting Message stanza's contents may be accessed as so:
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>>> message['to'] = "user@example.com"
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>>> message['body'] = "Hi!"
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>>> message['body']
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"Hi!"
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>>> del message['body']
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>>> message['body']
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""
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The interface values map to either custom access methods, stanza
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XML attributes, or (if the interface is also in sub_interfaces) the
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text contents of a stanza's subelement.
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Custom access methods may be created by adding methods of the
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form "getInterface", "setInterface", or "delInterface", where
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"Interface" is the titlecase version of the interface name.
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Stanzas may be extended through the use of plugins. A plugin
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is simply a stanza that has a plugin_attrib value. For example:
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>>> class MessagePlugin(ElementBase):
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... name = "custom_plugin"
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... namespace = "custom"
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... interfaces = set(('useful_thing', 'custom'))
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... plugin_attrib = "custom"
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The plugin stanza class must be associated with its intended
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container stanza by using register_stanza_plugin as so:
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>>> register_stanza_plugin(Message, MessagePlugin)
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The plugin may then be accessed as if it were built-in to the parent
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stanza.
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>>> message['custom']['useful_thing'] = 'foo'
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If a plugin provides an interface that is the same as the plugin's
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plugin_attrib value, then the plugin's interface may be assigned
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directly from the parent stanza, as shown below, but retrieving
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information will require all interfaces to be used, as so:
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>>> message['custom'] = 'bar' # Same as using message['custom']['custom']
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>>> message['custom']['custom'] # Must use all interfaces
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'bar'
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If the plugin sets the value is_extension = True, then both setting
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and getting an interface value that is the same as the plugin's
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plugin_attrib value will work, as so:
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>>> message['custom'] = 'bar' # Using is_extension=True
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>>> message['custom']
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'bar'
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Class Attributes:
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name -- The name of the stanza's main element.
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namespace -- The namespace of the stanza's main element.
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interfaces -- A set of attribute and element names that may
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be accessed using dictionary syntax.
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sub_interfaces -- A subset of the set of interfaces which map
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to subelements instead of attributes.
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subitem -- A set of stanza classes which are allowed to
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be added as substanzas. Deprecated version
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of plugin_iterables.
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overrides -- A list of interfaces prepended with 'get_',
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'set_', or 'del_'. If the stanza is registered
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as a plugin with overrides=True, then the
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parent's interface handlers will be
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overridden by the plugin's matching handler.
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types -- A set of generic type attribute values.
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tag -- The namespaced name of the stanza's root
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element. Example: "{foo_ns}bar"
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plugin_attrib -- The interface name that the stanza uses to be
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accessed as a plugin from another stanza.
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plugin_attrib_map -- A mapping of plugin attribute names with the
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associated plugin stanza classes.
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plugin_iterables -- A set of stanza classes which are allowed to
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be added as substanzas.
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plugin_overrides -- A mapping of interfaces prepended with 'get_',
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'set_' or 'del_' to plugin attrib names. Allows
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a plugin to override the behaviour of a parent
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stanza's interface handlers.
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plugin_tag_map -- A mapping of plugin stanza tag names with
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the associated plugin stanza classes.
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is_extension -- When True, allows the stanza to provide one
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additional interface to the parent stanza,
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extending the interfaces supported by the
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parent. Defaults to False.
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xml_ns -- The XML namespace,
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http://www.w3.org/XML/1998/namespace,
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for use with xml:lang values.
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Instance Attributes:
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xml -- The stanza's XML contents.
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parent -- The parent stanza of this stanza.
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plugins -- A map of enabled plugin names with the
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initialized plugin stanza objects.
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values -- A dictionary of the stanza's interfaces
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and interface values, including plugins.
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Class Methods
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tag_name -- Return the namespaced version of the stanza's
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root element's name.
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Methods:
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setup -- Initialize the stanza's XML contents.
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enable -- Instantiate a stanza plugin.
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Alias for init_plugin.
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init_plugin -- Instantiate a stanza plugin.
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_get_stanza_values -- Return a dictionary of stanza interfaces and
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their values.
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_set_stanza_values -- Set stanza interface values given a dictionary
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of interfaces and values.
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__getitem__ -- Return the value of a stanza interface.
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__setitem__ -- Set the value of a stanza interface.
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__delitem__ -- Remove the value of a stanza interface.
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_set_attr -- Set an attribute value of the main
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stanza element.
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_del_attr -- Remove an attribute from the main
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stanza element.
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_get_attr -- Return an attribute's value from the main
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stanza element.
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_get_sub_text -- Return the text contents of a subelement.
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_set_sub_text -- Set the text contents of a subelement.
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_del_sub -- Remove a subelement.
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match -- Compare the stanza against an XPath expression.
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find -- Return subelement matching an XPath expression.
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findall -- Return subelements matching an XPath expression.
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get -- Return the value of a stanza interface, with an
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optional default value.
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keys -- Return the set of interface names accepted by
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the stanza.
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append -- Add XML content or a substanza to the stanza.
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appendxml -- Add XML content to the stanza.
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pop -- Remove a substanza.
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next -- Return the next iterable substanza.
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clear -- Reset the stanza's XML contents.
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_fix_ns -- Apply the stanza's namespace to non-namespaced
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elements in an XPath expression.
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"""
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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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overrides = {}
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plugin_attrib_map = {}
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plugin_overrides = {}
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plugin_iterables = set()
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plugin_tag_map = {}
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subitem = set()
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is_extension = False
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xml_ns = 'http://www.w3.org/XML/1998/namespace'
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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 = OrderedDict()
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self.iterables = []
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self._index = 0
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self.tag = self.tag_name()
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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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ElementBase.values = property(ElementBase._get_stanza_values,
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ElementBase._set_stanza_values)
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if self.subitem is not None:
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for sub in self.subitem:
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self.plugin_iterables.add(sub)
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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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for sub in self.plugin_iterables:
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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 init_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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return self.init_plugin(attrib)
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def init_plugin(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 _get_stanza_values(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.values
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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.values)
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iterables[-1]['__childtag__'] = stanza.tag
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values['substanzas'] = iterables
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return values
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def _set_stanza_values(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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iterable_interfaces = [p.plugin_attrib for \
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p in self.plugin_iterables]
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for interface, value in values.items():
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if interface == 'substanzas':
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# Remove existing substanzas
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for stanza in self.iterables:
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self.xml.remove(stanza.xml)
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self.iterables = []
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# Add new 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.plugin_iterables:
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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.values = 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 iterable_interfaces:
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if interface not in self.plugins:
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self.init_plugin(interface)
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self.plugins[interface].values = 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 get_attrib method
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(or get_foo 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 the get_foo override handler.
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3. The result of calling get_foo.
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4. The result of calling getFoo.
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5. The contents of the foo subelement, if foo is a sub interface.
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6. The value of the foo attribute of the XML object.
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7. The plugin named 'foo'
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8. 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.lower()
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get_method2 = "get%s" % attrib.title()
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if self.plugin_overrides:
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plugin = self.plugin_overrides.get(get_method, None)
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if plugin:
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if plugin not in self.plugins:
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self.init_plugin(plugin)
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handler = getattr(self.plugins[plugin], get_method, None)
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if handler:
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return handler()
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if hasattr(self, get_method):
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return getattr(self, get_method)()
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elif hasattr(self, get_method2):
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return getattr(self, get_method2)()
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else:
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if attrib in self.sub_interfaces:
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return self._get_sub_text(attrib)
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else:
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return self._get_attr(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.init_plugin(attrib)
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if self.plugins[attrib].is_extension:
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return self.plugins[attrib][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 set_attrib method
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(or set_foo 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 the set_foo override handler, if it exists.
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3. Call set_foo, if it exists.
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4. Call setFoo, if it exists.
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5. Set the text of a foo element, if foo is in sub_interfaces.
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6. Set the value of a top level XML attribute name foo.
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7. Attempt to pass value to a plugin named foo using the plugin's
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foo interface.
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8. 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.lower()
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set_method2 = "set%s" % attrib.title()
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if self.plugin_overrides:
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plugin = self.plugin_overrides.get(set_method, None)
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if plugin:
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if plugin not in self.plugins:
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self.init_plugin(plugin)
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handler = getattr(self.plugins[plugin], set_method, None)
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if handler:
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return handler(value)
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if hasattr(self, set_method):
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getattr(self, set_method)(value,)
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elif hasattr(self, set_method2):
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getattr(self, set_method2)(value,)
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else:
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if attrib in self.sub_interfaces:
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return self._set_sub_text(attrib, text=value)
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else:
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self._set_attr(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.init_plugin(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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"""
|
|
Delete the value of a stanza interface using dictionary-like syntax.
|
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|
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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 del_attrib method
|
|
(or del_foo where the interface is named foo, etc).
|
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|
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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 del_foo override handler, if it exists.
|
|
2. Call del_foo, if it exists.
|
|
3. Call delFoo, if it exists.
|
|
4. Delete foo element, if foo is in sub_interfaces.
|
|
5. Delete top level XML attribute named foo.
|
|
6. Remove the foo plugin, if it was loaded.
|
|
7. Do nothing.
|
|
|
|
Arguments:
|
|
attrib -- The name of the affected stanza interface.
|
|
"""
|
|
if attrib in self.interfaces:
|
|
del_method = "del_%s" % attrib.lower()
|
|
del_method2 = "del%s" % attrib.title()
|
|
|
|
if self.plugin_overrides:
|
|
plugin = self.plugin_overrides.get(del_method, None)
|
|
if plugin:
|
|
if plugin not in self.plugins:
|
|
self.init_plugin(plugin)
|
|
handler = getattr(self.plugins[plugin], del_method, None)
|
|
if handler:
|
|
return handler()
|
|
|
|
if hasattr(self, del_method):
|
|
getattr(self, del_method)()
|
|
elif hasattr(self, del_method2):
|
|
getattr(self, del_method2)()
|
|
else:
|
|
if attrib in self.sub_interfaces:
|
|
return self._del_sub(attrib)
|
|
else:
|
|
self._del_attr(attrib)
|
|
elif attrib in self.plugin_attrib_map:
|
|
if attrib in self.plugins:
|
|
xml = self.plugins[attrib].xml
|
|
if self.plugins[attrib].is_extension:
|
|
del self.plugins[attrib][attrib]
|
|
del self.plugins[attrib]
|
|
try:
|
|
self.xml.remove(xml)
|
|
except:
|
|
pass
|
|
return self
|
|
|
|
def _set_attr(self, name, value):
|
|
"""
|
|
Set the value of a top level attribute of the underlying XML object.
|
|
|
|
If the new value is None or an empty string, then the attribute will
|
|
be removed.
|
|
|
|
Arguments:
|
|
name -- The name of the attribute.
|
|
value -- The new value of the attribute, or None or '' to
|
|
remove it.
|
|
"""
|
|
if value is None or value == '':
|
|
self.__delitem__(name)
|
|
else:
|
|
self.xml.attrib[name] = value
|
|
|
|
def _del_attr(self, name):
|
|
"""
|
|
Remove a top level attribute of the underlying XML object.
|
|
|
|
Arguments:
|
|
name -- The name of the attribute.
|
|
"""
|
|
if name in self.xml.attrib:
|
|
del self.xml.attrib[name]
|
|
|
|
def _get_attr(self, name, default=''):
|
|
"""
|
|
Return the value of a top level attribute of the underlying
|
|
XML object.
|
|
|
|
In case the attribute has not been set, a default value can be
|
|
returned instead. An empty string is returned if no other default
|
|
is supplied.
|
|
|
|
Arguments:
|
|
name -- The name of the attribute.
|
|
default -- Optional value to return if the attribute has not
|
|
been set. An empty string is returned otherwise.
|
|
"""
|
|
return self.xml.attrib.get(name, default)
|
|
|
|
def _get_sub_text(self, name, default=''):
|
|
"""
|
|
Return the text contents of a sub element.
|
|
|
|
In case the element does not exist, or it has no textual content,
|
|
a default value can be returned instead. An empty string is returned
|
|
if no other default is supplied.
|
|
|
|
Arguments:
|
|
name -- The name or XPath expression of the element.
|
|
default -- Optional default to return if the element does
|
|
not exists. An empty string is returned otherwise.
|
|
"""
|
|
name = self._fix_ns(name)
|
|
stanza = self.xml.find(name)
|
|
if stanza is None or stanza.text is None:
|
|
return default
|
|
else:
|
|
return stanza.text
|
|
|
|
def _set_sub_text(self, name, text=None, keep=False):
|
|
"""
|
|
Set the text contents of a sub element.
|
|
|
|
In case the element does not exist, a element will be created,
|
|
and its text contents will be set.
|
|
|
|
If the text is set to an empty string, or None, then the
|
|
element will be removed, unless keep is set to True.
|
|
|
|
Arguments:
|
|
name -- The name or XPath expression of the element.
|
|
text -- The new textual content of the element. If the text
|
|
is an empty string or None, the element will be removed
|
|
unless the parameter keep is True.
|
|
keep -- Indicates if the element should be kept if its text is
|
|
removed. Defaults to False.
|
|
"""
|
|
path = self._fix_ns(name, split=True)
|
|
element = self.xml.find(name)
|
|
|
|
if not text and not keep:
|
|
return self._del_sub(name)
|
|
|
|
if element is None:
|
|
# We need to add the element. If the provided name was
|
|
# an XPath expression, some of the intermediate elements
|
|
# may already exist. If so, we want to use those instead
|
|
# of generating new elements.
|
|
last_xml = self.xml
|
|
walked = []
|
|
for ename in path:
|
|
walked.append(ename)
|
|
element = self.xml.find("/".join(walked))
|
|
if element is None:
|
|
element = ET.Element(ename)
|
|
last_xml.append(element)
|
|
last_xml = element
|
|
element = last_xml
|
|
|
|
element.text = text
|
|
return element
|
|
|
|
def _del_sub(self, name, all=False):
|
|
"""
|
|
Remove sub elements that match the given name or XPath.
|
|
|
|
If the element is in a path, then any parent elements that become
|
|
empty after deleting the element may also be deleted if requested
|
|
by setting all=True.
|
|
|
|
Arguments:
|
|
name -- The name or XPath expression for the element(s) to remove.
|
|
all -- If True, remove all empty elements in the path to the
|
|
deleted element. Defaults to False.
|
|
"""
|
|
path = self._fix_ns(name, split=True)
|
|
original_target = path[-1]
|
|
|
|
for level, _ in enumerate(path):
|
|
# Generate the paths to the target elements and their parent.
|
|
element_path = "/".join(path[:len(path) - level])
|
|
parent_path = "/".join(path[:len(path) - level - 1])
|
|
|
|
elements = self.xml.findall(element_path)
|
|
parent = self.xml.find(parent_path)
|
|
|
|
if elements:
|
|
if parent is None:
|
|
parent = self.xml
|
|
for element in elements:
|
|
if element.tag == original_target or \
|
|
not element.getchildren():
|
|
# Only delete the originally requested elements, and
|
|
# any parent elements that have become empty.
|
|
parent.remove(element)
|
|
if not all:
|
|
# If we don't want to delete elements up the tree, stop
|
|
# after deleting the first level of elements.
|
|
return
|
|
|
|
def match(self, xpath):
|
|
"""
|
|
Compare a stanza object with an XPath expression. If the XPath matches
|
|
the contents of the stanza object, the match is successful.
|
|
|
|
The XPath expression may include checks for stanza attributes.
|
|
For example:
|
|
presence@show=xa@priority=2/status
|
|
Would match a presence stanza whose show value is set to 'xa', has a
|
|
priority value of '2', and has a status element.
|
|
|
|
Arguments:
|
|
xpath -- The XPath expression to check against. It may be either a
|
|
string or a list of element names with attribute checks.
|
|
"""
|
|
if isinstance(xpath, str):
|
|
xpath = self._fix_ns(xpath, split=True, propagate_ns=False)
|
|
|
|
# Extract the tag name and attribute checks for the first XPath node.
|
|
components = xpath[0].split('@')
|
|
tag = components[0]
|
|
attributes = components[1:]
|
|
|
|
if tag not in (self.name, "{%s}%s" % (self.namespace, self.name)) and \
|
|
tag not in self.plugins and tag not in self.plugin_attrib:
|
|
# The requested tag is not in this stanza, so no match.
|
|
return False
|
|
|
|
# Check the rest of the XPath against any substanzas.
|
|
matched_substanzas = False
|
|
for substanza in self.iterables:
|
|
if xpath[1:] == []:
|
|
break
|
|
matched_substanzas = substanza.match(xpath[1:])
|
|
if matched_substanzas:
|
|
break
|
|
|
|
# Check attribute values.
|
|
for attribute in attributes:
|
|
name, value = attribute.split('=')
|
|
if self[name] != value:
|
|
return False
|
|
|
|
# Check sub interfaces.
|
|
if len(xpath) > 1:
|
|
next_tag = xpath[1]
|
|
if next_tag in self.sub_interfaces and self[next_tag]:
|
|
return True
|
|
|
|
# Attempt to continue matching the XPath using the stanza's plugins.
|
|
if not matched_substanzas and len(xpath) > 1:
|
|
# Convert {namespace}tag@attribs to just tag
|
|
next_tag = xpath[1].split('@')[0].split('}')[-1]
|
|
if next_tag in self.plugins:
|
|
return self.plugins[next_tag].match(xpath[1:])
|
|
else:
|
|
return False
|
|
|
|
# Everything matched.
|
|
return True
|
|
|
|
def find(self, xpath):
|
|
"""
|
|
Find an XML object in this stanza given an XPath expression.
|
|
|
|
Exposes ElementTree interface for backwards compatibility.
|
|
|
|
Note that matching on attribute values is not supported in Python 2.6
|
|
or Python 3.1
|
|
|
|
Arguments:
|
|
xpath -- An XPath expression matching a single desired element.
|
|
"""
|
|
return self.xml.find(xpath)
|
|
|
|
def findall(self, xpath):
|
|
"""
|
|
Find multiple XML objects in this stanza given an XPath expression.
|
|
|
|
Exposes ElementTree interface for backwards compatibility.
|
|
|
|
Note that matching on attribute values is not supported in Python 2.6
|
|
or Python 3.1.
|
|
|
|
Arguments:
|
|
xpath -- An XPath expression matching multiple desired elements.
|
|
"""
|
|
return self.xml.findall(xpath)
|
|
|
|
def get(self, key, default=None):
|
|
"""
|
|
Return the value of a stanza interface. If the found value is None
|
|
or an empty string, return the supplied default value.
|
|
|
|
Allows stanza objects to be used like dictionaries.
|
|
|
|
Arguments:
|
|
key -- The name of the stanza interface to check.
|
|
default -- Value to return if the stanza interface has a value
|
|
of None or "". Will default to returning None.
|
|
"""
|
|
value = self[key]
|
|
if value is None or value == '':
|
|
return default
|
|
return value
|
|
|
|
def keys(self):
|
|
"""
|
|
Return the names of all stanza interfaces provided by the
|
|
stanza object.
|
|
|
|
Allows stanza objects to be used like dictionaries.
|
|
"""
|
|
out = []
|
|
out += [x for x in self.interfaces]
|
|
out += [x for x in self.plugins]
|
|
if self.iterables:
|
|
out.append('substanzas')
|
|
return out
|
|
|
|
def append(self, item):
|
|
"""
|
|
Append either an XML object or a substanza to this stanza object.
|
|
|
|
If a substanza object is appended, it will be added to the list
|
|
of iterable stanzas.
|
|
|
|
Allows stanza objects to be used like lists.
|
|
|
|
Arguments:
|
|
item -- Either an XML object or a stanza object to add to
|
|
this stanza's contents.
|
|
"""
|
|
if not isinstance(item, ElementBase):
|
|
if type(item) == XML_TYPE:
|
|
return self.appendxml(item)
|
|
else:
|
|
raise TypeError
|
|
self.xml.append(item.xml)
|
|
self.iterables.append(item)
|
|
return self
|
|
|
|
def appendxml(self, xml):
|
|
"""
|
|
Append an XML object to the stanza's XML.
|
|
|
|
The added XML will not be included in the list of
|
|
iterable substanzas.
|
|
|
|
Arguments:
|
|
xml -- The XML object to add to the stanza.
|
|
"""
|
|
self.xml.append(xml)
|
|
return self
|
|
|
|
def pop(self, index=0):
|
|
"""
|
|
Remove and return the last substanza in the list of
|
|
iterable substanzas.
|
|
|
|
Allows stanza objects to be used like lists.
|
|
|
|
Arguments:
|
|
index -- The index of the substanza to remove.
|
|
"""
|
|
substanza = self.iterables.pop(index)
|
|
self.xml.remove(substanza.xml)
|
|
return substanza
|
|
|
|
def next(self):
|
|
"""
|
|
Return the next iterable substanza.
|
|
"""
|
|
return self.__next__()
|
|
|
|
def clear(self):
|
|
"""
|
|
Remove all XML element contents and plugins.
|
|
|
|
Any attribute values will be preserved.
|
|
"""
|
|
for child in self.xml.getchildren():
|
|
self.xml.remove(child)
|
|
for plugin in list(self.plugins.keys()):
|
|
del self.plugins[plugin]
|
|
return self
|
|
|
|
@classmethod
|
|
def tag_name(cls):
|
|
"""
|
|
Return the namespaced name of the stanza's root element.
|
|
|
|
For example, for the stanza <foo xmlns="bar" />,
|
|
stanza.tag would return "{bar}foo".
|
|
"""
|
|
return "{%s}%s" % (cls.namespace, cls.name)
|
|
|
|
@property
|
|
def attrib(self):
|
|
"""
|
|
DEPRECATED
|
|
|
|
For backwards compatibility, stanza.attrib returns the stanza itself.
|
|
|
|
Older implementations of stanza objects used XML objects directly,
|
|
requiring the use of .attrib to access attribute values.
|
|
|
|
Use of the dictionary syntax with the stanza object itself for
|
|
accessing stanza interfaces is preferred.
|
|
"""
|
|
return self
|
|
|
|
def _fix_ns(self, xpath, split=False, propagate_ns=True):
|
|
"""
|
|
Apply the stanza's namespace to elements in an XPath expression.
|
|
|
|
Arguments:
|
|
xpath -- The XPath expression to fix with namespaces.
|
|
split -- Indicates if the fixed XPath should be left as a
|
|
list of element names with namespaces. Defaults to
|
|
False, which returns a flat string path.
|
|
propagate_ns -- Overrides propagating parent element namespaces
|
|
to child elements. Useful if you wish to simply
|
|
split an XPath that has non-specified namespaces,
|
|
and child and parent namespaces are known not to
|
|
always match. Defaults to True.
|
|
"""
|
|
fixed = []
|
|
# Split the XPath into a series of blocks, where a block
|
|
# is started by an element with a namespace.
|
|
ns_blocks = xpath.split('{')
|
|
for ns_block in ns_blocks:
|
|
if '}' in ns_block:
|
|
# Apply the found namespace to following elements
|
|
# that do not have namespaces.
|
|
namespace = ns_block.split('}')[0]
|
|
elements = ns_block.split('}')[1].split('/')
|
|
else:
|
|
# Apply the stanza's namespace to the following
|
|
# elements since no namespace was provided.
|
|
namespace = self.namespace
|
|
elements = ns_block.split('/')
|
|
|
|
for element in elements:
|
|
if element:
|
|
# Skip empty entry artifacts from splitting.
|
|
if propagate_ns:
|
|
tag = '{%s}%s' % (namespace, element)
|
|
else:
|
|
tag = element
|
|
fixed.append(tag)
|
|
if split:
|
|
return fixed
|
|
return '/'.join(fixed)
|
|
|
|
def __eq__(self, other):
|
|
"""
|
|
Compare the stanza object with another to test for equality.
|
|
|
|
Stanzas are equal if their interfaces return the same values,
|
|
and if they are both instances of ElementBase.
|
|
|
|
Arguments:
|
|
other -- The stanza object to compare against.
|
|
"""
|
|
if not isinstance(other, ElementBase):
|
|
return False
|
|
|
|
# Check that this stanza is a superset of the other stanza.
|
|
values = self.values
|
|
for key in other.keys():
|
|
if key not in values or values[key] != other[key]:
|
|
return False
|
|
|
|
# Check that the other stanza is a superset of this stanza.
|
|
values = other.values
|
|
for key in self.keys():
|
|
if key not in values or values[key] != self[key]:
|
|
return False
|
|
|
|
# Both stanzas are supersets of each other, therefore they
|
|
# must be equal.
|
|
return True
|
|
|
|
def __ne__(self, other):
|
|
"""
|
|
Compare the stanza object with another to test for inequality.
|
|
|
|
Stanzas are not equal if their interfaces return different values,
|
|
or if they are not both instances of ElementBase.
|
|
|
|
Arguments:
|
|
other -- The stanza object to compare against.
|
|
"""
|
|
return not self.__eq__(other)
|
|
|
|
def __bool__(self):
|
|
"""
|
|
Stanza objects should be treated as True in boolean contexts.
|
|
|
|
Python 3.x version.
|
|
"""
|
|
return True
|
|
|
|
def __nonzero__(self):
|
|
"""
|
|
Stanza objects should be treated as True in boolean contexts.
|
|
|
|
Python 2.x version.
|
|
"""
|
|
return True
|
|
|
|
def __len__(self):
|
|
"""
|
|
Return the number of iterable substanzas contained in this stanza.
|
|
"""
|
|
return len(self.iterables)
|
|
|
|
def __iter__(self):
|
|
"""
|
|
Return an iterator object for iterating over the stanza's substanzas.
|
|
|
|
The iterator is the stanza object itself. Attempting to use two
|
|
iterators on the same stanza at the same time is discouraged.
|
|
"""
|
|
self._index = 0
|
|
return self
|
|
|
|
def __next__(self):
|
|
"""
|
|
Return the next iterable substanza.
|
|
"""
|
|
self._index += 1
|
|
if self._index > len(self.iterables):
|
|
self._index = 0
|
|
raise StopIteration
|
|
return self.iterables[self._index - 1]
|
|
|
|
def __copy__(self):
|
|
"""
|
|
Return a copy of the stanza object that does not share the same
|
|
underlying XML object.
|
|
"""
|
|
return self.__class__(xml=copy.deepcopy(self.xml), parent=self.parent)
|
|
|
|
def __str__(self, top_level_ns=True):
|
|
"""
|
|
Return a string serialization of the underlying XML object.
|
|
|
|
Arguments:
|
|
top_level_ns -- Display the top-most namespace.
|
|
Defaults to True.
|
|
"""
|
|
stanza_ns = '' if top_level_ns else self.namespace
|
|
return tostring(self.xml, xmlns='',
|
|
stanza_ns=stanza_ns,
|
|
top_level = not top_level_ns)
|
|
|
|
def __repr__(self):
|
|
"""
|
|
Use the stanza's serialized XML as its representation.
|
|
"""
|
|
return self.__str__()
|
|
|
|
|
|
class StanzaBase(ElementBase):
|
|
|
|
"""
|
|
StanzaBase provides the foundation for all other stanza objects used by
|
|
SleekXMPP, and defines a basic set of interfaces common to nearly
|
|
all stanzas. These interfaces are the 'id', 'type', 'to', and 'from'
|
|
attributes. An additional interface, 'payload', is available to access
|
|
the XML contents of the stanza. Most stanza objects will provided more
|
|
specific interfaces, however.
|
|
|
|
Stanza Interface:
|
|
from -- A JID object representing the sender's JID.
|
|
id -- An optional id value that can be used to associate stanzas
|
|
with their replies.
|
|
payload -- The XML contents of the stanza.
|
|
to -- A JID object representing the recipient's JID.
|
|
type -- The type of stanza, typically will be 'normal', 'error',
|
|
'get', or 'set', etc.
|
|
|
|
Attributes:
|
|
stream -- The XMLStream instance that will handle sending this stanza.
|
|
|
|
Methods:
|
|
set_type -- Set the type of the stanza.
|
|
get_to -- Return the stanza recipients JID.
|
|
set_to -- Set the stanza recipient's JID.
|
|
get_from -- Return the stanza sender's JID.
|
|
set_from -- Set the stanza sender's JID.
|
|
get_payload -- Return the stanza's XML contents.
|
|
set_payload -- Append to the stanza's XML contents.
|
|
del_payload -- Remove the stanza's XML contents.
|
|
reply -- Reset the stanza and modify the 'to' and 'from'
|
|
attributes to prepare for sending a reply.
|
|
error -- Set the stanza's type to 'error'.
|
|
unhandled -- Callback for when the stanza is not handled by a
|
|
stream handler.
|
|
exception -- Callback for if an exception is raised while
|
|
handling the stanza.
|
|
send -- Send the stanza using the stanza's stream.
|
|
"""
|
|
|
|
name = 'stanza'
|
|
namespace = 'jabber:client'
|
|
interfaces = set(('type', 'to', 'from', 'id', 'payload'))
|
|
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):
|
|
"""
|
|
Create a new stanza.
|
|
|
|
Arguments:
|
|
stream -- Optional XMLStream responsible for sending this stanza.
|
|
xml -- Optional XML contents to initialize stanza values.
|
|
stype -- Optional stanza type value.
|
|
sto -- Optional string or JID object of the recipient's JID.
|
|
sfrom -- Optional string or JID object of the sender's JID.
|
|
sid -- Optional ID value for the stanza.
|
|
"""
|
|
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 set_type(self, value):
|
|
"""
|
|
Set the stanza's 'type' attribute.
|
|
|
|
Only type values contained in StanzaBase.types are accepted.
|
|
|
|
Arguments:
|
|
value -- One of the values contained in StanzaBase.types
|
|
"""
|
|
if value in self.types:
|
|
self.xml.attrib['type'] = value
|
|
return self
|
|
|
|
def get_to(self):
|
|
"""Return the value of the stanza's 'to' attribute."""
|
|
return JID(self._get_attr('to'))
|
|
|
|
def set_to(self, value):
|
|
"""
|
|
Set the 'to' attribute of the stanza.
|
|
|
|
Arguments:
|
|
value -- A string or JID object representing the recipient's JID.
|
|
"""
|
|
return self._set_attr('to', str(value))
|
|
|
|
def get_from(self):
|
|
"""Return the value of the stanza's 'from' attribute."""
|
|
return JID(self._get_attr('from'))
|
|
|
|
def set_from(self, value):
|
|
"""
|
|
Set the 'from' attribute of the stanza.
|
|
|
|
Arguments:
|
|
from -- A string or JID object representing the sender's JID.
|
|
"""
|
|
return self._set_attr('from', str(value))
|
|
|
|
def get_payload(self):
|
|
"""Return a list of XML objects contained in the stanza."""
|
|
return self.xml.getchildren()
|
|
|
|
def set_payload(self, value):
|
|
"""
|
|
Add XML content to the stanza.
|
|
|
|
Arguments:
|
|
value -- Either an XML or a stanza object, or a list
|
|
of XML or stanza objects.
|
|
"""
|
|
if not isinstance(value, list):
|
|
value = [value]
|
|
for val in value:
|
|
self.append(val)
|
|
return self
|
|
|
|
def del_payload(self):
|
|
"""Remove the XML contents of the stanza."""
|
|
self.clear()
|
|
return self
|
|
|
|
def reply(self, clear=True):
|
|
"""
|
|
Swap the 'from' and 'to' attributes to prepare the stanza for
|
|
sending a reply. If clear=True, then also remove the stanza's
|
|
contents to make room for the reply content.
|
|
|
|
For client streams, the 'from' attribute is removed.
|
|
|
|
Arguments:
|
|
clear -- Indicates if the stanza's contents should be
|
|
removed. Defaults to True
|
|
"""
|
|
# 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']
|
|
if clear:
|
|
self.clear()
|
|
return self
|
|
|
|
def error(self):
|
|
"""Set the stanza's type to 'error'."""
|
|
self['type'] = 'error'
|
|
return self
|
|
|
|
def unhandled(self):
|
|
"""
|
|
Called when no handlers have been registered to process this
|
|
stanza.
|
|
|
|
Meant to be overridden.
|
|
"""
|
|
pass
|
|
|
|
def exception(self, e):
|
|
"""
|
|
Handle exceptions raised during stanza processing.
|
|
|
|
Meant to be overridden.
|
|
"""
|
|
log.exception('Error handling {%s}%s stanza' % (self.namespace,
|
|
self.name))
|
|
|
|
def send(self, now=False):
|
|
"""
|
|
Queue the stanza to be sent on the XML stream.
|
|
Arguments:
|
|
now -- Indicates if the queue should be skipped and the
|
|
stanza sent immediately. Useful for stream
|
|
initialization. Defaults to False.
|
|
"""
|
|
self.stream.send_raw(self.__str__(), now=now)
|
|
|
|
def __copy__(self):
|
|
"""
|
|
Return a copy of the stanza object that does not share the
|
|
same underlying XML object, but does share the same XML stream.
|
|
"""
|
|
return self.__class__(xml=copy.deepcopy(self.xml),
|
|
stream=self.stream)
|
|
|
|
def __str__(self, top_level_ns=False):
|
|
"""
|
|
Serialize the stanza's XML to a string.
|
|
|
|
Arguments:
|
|
top_level_ns -- Display the top-most namespace.
|
|
Defaults to False.
|
|
"""
|
|
stanza_ns = '' if top_level_ns else self.namespace
|
|
return tostring(self.xml, xmlns='',
|
|
stanza_ns=stanza_ns,
|
|
stream=self.stream,
|
|
top_level = not top_level_ns)
|
|
|
|
|
|
# To comply with PEP8, method names now use underscores.
|
|
# Deprecated method names are re-mapped for backwards compatibility.
|
|
ElementBase.initPlugin = ElementBase.init_plugin
|
|
ElementBase._getAttr = ElementBase._get_attr
|
|
ElementBase._setAttr = ElementBase._set_attr
|
|
ElementBase._delAttr = ElementBase._del_attr
|
|
ElementBase._getSubText = ElementBase._get_sub_text
|
|
ElementBase._setSubText = ElementBase._set_sub_text
|
|
ElementBase._delSub = ElementBase._del_sub
|
|
ElementBase.getStanzaValues = ElementBase._get_stanza_values
|
|
ElementBase.setStanzaValues = ElementBase._set_stanza_values
|
|
|
|
StanzaBase.setType = StanzaBase.set_type
|
|
StanzaBase.getTo = StanzaBase.get_to
|
|
StanzaBase.setTo = StanzaBase.set_to
|
|
StanzaBase.getFrom = StanzaBase.get_from
|
|
StanzaBase.setFrom = StanzaBase.set_from
|
|
StanzaBase.getPayload = StanzaBase.get_payload
|
|
StanzaBase.setPayload = StanzaBase.set_payload
|
|
StanzaBase.delPayload = StanzaBase.del_payload
|