diff options
Diffstat (limited to 'sleekxmpp/xmlstream/stanzabase.py')
| -rw-r--r-- | sleekxmpp/xmlstream/stanzabase.py | 1323 |
1 files changed, 1323 insertions, 0 deletions
diff --git a/sleekxmpp/xmlstream/stanzabase.py b/sleekxmpp/xmlstream/stanzabase.py new file mode 100644 index 00000000..dff8c997 --- /dev/null +++ b/sleekxmpp/xmlstream/stanzabase.py @@ -0,0 +1,1323 @@ +# -*- coding: utf-8 -*- +""" + sleekxmpp.xmlstream.stanzabase + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + + This module implements a wrapper layer for XML objects + that allows them to be treated like dictionaries. + + Part of SleekXMPP: The Sleek XMPP Library + + :copyright: (c) 2011 Nathanael C. Fritz + :license: MIT, see LICENSE for more details +""" + +import copy +import logging +import sys +import weakref +from xml.etree import cElementTree as ET + +from sleekxmpp.xmlstream import JID +from sleekxmpp.xmlstream.tostring import tostring +from sleekxmpp.thirdparty import OrderedDict + + +log = logging.getLogger(__name__) + + +# Used to check if an argument is an XML object. +XML_TYPE = type(ET.Element('xml')) + + +def register_stanza_plugin(stanza, plugin, iterable=False, overrides=False): + """ + Associate a stanza object as a plugin for another stanza. + + >>> from sleekxmpp.xmlstream import register_stanza_plugin + >>> register_stanza_plugin(Iq, CustomStanza) + + :param class stanza: The class of the parent stanza. + :param class plugin: The class of the plugin stanza. + :param bool iterable: Indicates if the plugin stanza should be + included in the parent stanza's iterable + ``'substanzas'`` interface results. + :param bool overrides: Indicates if the plugin should be allowed + to override the interface handlers for + the parent stanza, based on the plugin's + ``overrides`` field. + + .. versionadded:: 1.0-Beta1 + Made ``register_stanza_plugin`` the default name. The prior + ``registerStanzaPlugin`` function name remains as an alias. + """ + tag = "{%s}%s" % (plugin.namespace, plugin.name) + + # Prevent weird memory reference gotchas by ensuring + # that the parent stanza class has its own set of + # plugin info maps and is not using the mappings from + # an ancestor class (like ElementBase). + plugin_info = ('plugin_attrib_map', 'plugin_tag_map', + 'plugin_iterables', 'plugin_overrides') + for attr in plugin_info: + info = getattr(stanza, attr) + setattr(stanza, attr, info.copy()) + + stanza.plugin_attrib_map[plugin.plugin_attrib] = plugin + stanza.plugin_tag_map[tag] = plugin + + if iterable: + stanza.plugin_iterables.add(plugin) + if overrides: + for interface in plugin.overrides: + stanza.plugin_overrides[interface] = plugin.plugin_attrib + + +# To maintain backwards compatibility for now, preserve the camel case name. +registerStanzaPlugin = register_stanza_plugin + + +def fix_ns(xpath, split=False, propagate_ns=True, default_ns=''): + """Apply the stanza's namespace to elements in an XPath expression. + + :param string xpath: The XPath expression to fix with namespaces. + :param bool 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. + :param bool 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 = default_ns + 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) + + +class ElementBase(object): + + """ + The core of SleekXMPP's stanza XML manipulation and handling is provided + by ElementBase. ElementBase wraps XML cElementTree objects and enables + access to the XML contents through dictionary syntax, similar in style + to the Ruby XMPP library Blather's stanza implementation. + + Stanzas are defined by their name, namespace, and interfaces. For + example, a simplistic Message stanza could be defined as:: + + >>> class Message(ElementBase): + ... name = "message" + ... namespace = "jabber:client" + ... interfaces = set(('to', 'from', 'type', 'body')) + ... sub_interfaces = set(('body',)) + + The resulting Message stanza's contents may be accessed as so:: + + >>> message['to'] = "user@example.com" + >>> message['body'] = "Hi!" + >>> message['body'] + "Hi!" + >>> del message['body'] + >>> message['body'] + "" + + The interface values map to either custom access methods, stanza + XML attributes, or (if the interface is also in sub_interfaces) the + text contents of a stanza's subelement. + + Custom access methods may be created by adding methods of the + form "getInterface", "setInterface", or "delInterface", where + "Interface" is the titlecase version of the interface name. + + Stanzas may be extended through the use of plugins. A plugin + is simply a stanza that has a plugin_attrib value. For example:: + + >>> class MessagePlugin(ElementBase): + ... name = "custom_plugin" + ... namespace = "custom" + ... interfaces = set(('useful_thing', 'custom')) + ... plugin_attrib = "custom" + + The plugin stanza class must be associated with its intended + container stanza by using register_stanza_plugin as so:: + + >>> register_stanza_plugin(Message, MessagePlugin) + + The plugin may then be accessed as if it were built-in to the parent + stanza:: + + >>> message['custom']['useful_thing'] = 'foo' + + If a plugin provides an interface that is the same as the plugin's + plugin_attrib value, then the plugin's interface may be assigned + directly from the parent stanza, as shown below, but retrieving + information will require all interfaces to be used, as so:: + + >>> message['custom'] = 'bar' # Same as using message['custom']['custom'] + >>> message['custom']['custom'] # Must use all interfaces + 'bar' + + If the plugin sets :attr:`is_extension` to ``True``, then both setting + and getting an interface value that is the same as the plugin's + plugin_attrib value will work, as so:: + + >>> message['custom'] = 'bar' # Using is_extension=True + >>> message['custom'] + 'bar' + + + :param xml: Initialize the stanza object with an existing XML object. + :param parent: Optionally specify a parent stanza object will will + contain this substanza. + """ + + #: The XML tag name of the element, not including any namespace + #: prefixes. For example, an :class:`ElementBase` object for ``<message />`` + #: would use ``name = 'message'``. + name = 'stanza' + + #: The XML namespace for the element. Given ``<foo xmlns="bar" />``, + #: then ``namespace = "bar"`` should be used. The default namespace + #: is ``jabber:client`` since this is being used in an XMPP library. + namespace = 'jabber:client' + + #: For :class:`ElementBase` subclasses which are intended to be used + #: as plugins, the ``plugin_attrib`` value defines the plugin name. + #: Plugins may be accessed by using the ``plugin_attrib`` value as + #: the interface. An example using ``plugin_attrib = 'foo'``:: + #: + #: register_stanza_plugin(Message, FooPlugin) + #: msg = Message() + #: msg['foo']['an_interface_from_the_foo_plugin'] + plugin_attrib = 'plugin' + + #: The set of keys that the stanza provides for accessing and + #: manipulating the underlying XML object. This set may be augmented + #: with the :attr:`plugin_attrib` value of any registered + #: stanza plugins. + interfaces = set(('type', 'to', 'from', 'id', 'payload')) + + #: A subset of :attr:`interfaces` which maps interfaces to direct + #: subelements of the underlying XML object. Using this set, the text + #: of these subelements may be set, retrieved, or removed without + #: needing to define custom methods. + sub_interfaces = tuple() + + #: In some cases you may wish to override the behaviour of one of the + #: parent stanza's interfaces. The ``overrides`` list specifies the + #: interface name and access method to be overridden. For example, + #: to override setting the parent's ``'condition'`` interface you + #: would use:: + #: + #: overrides = ['set_condition'] + #: + #: Getting and deleting the ``'condition'`` interface would not + #: be affected. + #: + #: .. versionadded:: 1.0-Beta5 + overrides = [] + + #: If you need to add a new interface to an existing stanza, you + #: can create a plugin and set ``is_extension = True``. Be sure + #: to set the :attr:`plugin_attrib` value to the desired interface + #: name, and that it is the only interface listed in + #: :attr:`interfaces`. Requests for the new interface from the + #: parent stanza will be passed to the plugin directly. + #: + #: .. versionadded:: 1.0-Beta5 + is_extension = False + + #: A map of interface operations to the overriding functions. + #: For example, after overriding the ``set`` operation for + #: the interface ``body``, :attr:`plugin_overrides` would be:: + #: + #: {'set_body': <some function>} + #: + #: .. versionadded: 1.0-Beta5 + plugin_overrides = {} + + #: A mapping of the :attr:`plugin_attrib` values of registered + #: plugins to their respective classes. + plugin_attrib_map = {} + + #: A mapping of root element tag names (in ``'{namespace}elementname'`` + #: format) to the plugin classes responsible for them. + plugin_tag_map = {} + + #: The set of stanza classes that can be iterated over using + #: the 'substanzas' interface. Classes are added to this set + #: when registering a plugin with ``iterable=True``:: + #: + #: register_stanza_plugin(DiscoInfo, DiscoItem, iterable=True) + #: + #: .. versionadded:: 1.0-Beta5 + plugin_iterables = set() + + #: A deprecated version of :attr:`plugin_iterables` that remains + #: for backward compatibility. It required a parent stanza to + #: know beforehand what stanza classes would be iterable:: + #: + #: class DiscoItem(ElementBase): + #: ... + #: + #: class DiscoInfo(ElementBase): + #: subitem = (DiscoItem, ) + #: ... + #: + #: .. deprecated:: 1.0-Beta5 + subitem = set() + + #: The default XML namespace: ``http://www.w3.org/XML/1998/namespace``. + xml_ns = 'http://www.w3.org/XML/1998/namespace' + + def __init__(self, xml=None, parent=None): + self._index = 0 + + #: The underlying XML object for the stanza. It is a standard + #: :class:`xml.etree.cElementTree` object. + self.xml = xml + + #: An ordered dictionary of plugin stanzas, mapped by their + #: :attr:`plugin_attrib` value. + self.plugins = OrderedDict() + + #: A list of child stanzas whose class is included in + #: :attr:`plugin_iterables`. + self.iterables = [] + + #: The name of the tag for the stanza's root element. It is the + #: same as calling :meth:`tag_name()` and is formatted as + #: ``'{namespace}elementname'``. + self.tag = self.tag_name() + + #: A :class:`weakref.weakref` to the parent stanza, if there is one. + #: If not, then :attr:`parent` is ``None``. + self.parent = None + if parent is not None: + self.parent = weakref.ref(parent) + + if self.subitem is not None: + for sub in self.subitem: + self.plugin_iterables.add(sub) + + if self.setup(xml): + # If we generated our own XML, then everything is ready. + return + + # Initialize values using provided XML + for child in self.xml.getchildren(): + if child.tag in self.plugin_tag_map: + plugin_class = self.plugin_tag_map[child.tag] + plugin = plugin_class(child, self) + self.plugins[plugin.plugin_attrib] = plugin + if plugin_class in self.plugin_iterables: + self.iterables.append(plugin) + + def setup(self, xml=None): + """Initialize the stanza's XML contents. + + Will return ``True`` if XML was generated according to the stanza's + definition instead of building a stanza object from an existing + XML object. + + :param xml: An existing XML object to use for the stanza's content + instead of generating new XML. + """ + if self.xml is None: + self.xml = xml + + if self.xml is None: + # Generate XML from the stanza definition + for ename in self.name.split('/'): + new = ET.Element("{%s}%s" % (self.namespace, ename)) + if self.xml is None: + self.xml = new + else: + last_xml.append(new) + last_xml = new + if self.parent is not None: + self.parent().xml.append(self.xml) + + # We had to generate XML + return True + else: + # We did not generate XML + return False + + def enable(self, attrib): + """Enable and initialize a stanza plugin. + + Alias for :meth:`init_plugin`. + + :param string attrib: The :attr:`plugin_attrib` value of the + plugin to enable. + """ + return self.init_plugin(attrib) + + def init_plugin(self, attrib): + """Enable and initialize a stanza plugin. + + :param string attrib: The :attr:`plugin_attrib` value of the + plugin to enable. + """ + if attrib not in self.plugins: + plugin_class = self.plugin_attrib_map[attrib] + existing_xml = self.xml.find(plugin_class.tag_name()) + plugin = plugin_class(parent=self, xml=existing_xml) + self.plugins[attrib] = plugin + if plugin_class in self.plugin_iterables: + self.iterables.append(plugin) + return self + + def _get_stanza_values(self): + """Return A JSON/dictionary version of the XML content + exposed through the stanza's interfaces:: + + >>> msg = Message() + >>> msg.values + {'body': '', 'from': , 'mucnick': '', 'mucroom': '', + 'to': , 'type': 'normal', 'id': '', 'subject': ''} + + Likewise, assigning to :attr:`values` will change the XML + content:: + + >>> msg = Message() + >>> msg.values = {'body': 'Hi!', 'to': 'user@example.com'} + >>> msg + '<message to="user@example.com"><body>Hi!</body></message>' + + .. versionadded:: 1.0-Beta1 + """ + values = {} + for interface in self.interfaces: + values[interface] = self[interface] + for plugin, stanza in self.plugins.items(): + values[plugin] = stanza.values + if self.iterables: + iterables = [] + for stanza in self.iterables: + iterables.append(stanza.values) + iterables[-1]['__childtag__'] = stanza.tag + values['substanzas'] = iterables + return values + + def _set_stanza_values(self, values): + """Set multiple stanza interface values using a dictionary. + + Stanza plugin values may be set using nested dictionaries. + + :param values: A dictionary mapping stanza interface with values. + Plugin interfaces may accept a nested dictionary that + will be used recursively. + + .. versionadded:: 1.0-Beta1 + """ + iterable_interfaces = [p.plugin_attrib for \ + p in self.plugin_iterables] + + for interface, value in values.items(): + if interface == 'substanzas': + # Remove existing substanzas + for stanza in self.iterables: + self.xml.remove(stanza.xml) + self.iterables = [] + + # Add new substanzas + for subdict in value: + if '__childtag__' in subdict: + for subclass in self.plugin_iterables: + child_tag = "{%s}%s" % (subclass.namespace, + subclass.name) + if subdict['__childtag__'] == child_tag: + sub = subclass(parent=self) + sub.values = subdict + self.iterables.append(sub) + break + elif interface in self.interfaces: + self[interface] = value + elif interface in self.plugin_attrib_map: + if interface not in iterable_interfaces: + if interface not in self.plugins: + self.init_plugin(interface) + self.plugins[interface].values = value + return self + + def __getitem__(self, attrib): + """Return the value of a stanza interface using dict-like syntax. + + Example:: + + >>> msg['body'] + 'Message contents' + + Stanza interfaces are typically mapped directly to the underlying XML + object, but can be overridden by the presence of a ``get_attrib`` + method (or ``get_foo`` where the interface is named ``'foo'``, etc). + + The search order for interface value retrieval for an interface + named ``'foo'`` is: + + 1. The list of substanzas (``'substanzas'``) + 2. The result of calling the ``get_foo`` override handler. + 3. The result of calling ``get_foo``. + 4. The result of calling ``getFoo``. + 5. The contents of the ``foo`` subelement, if ``foo`` is listed + in :attr:`sub_interfaces`. + 6. The value of the ``foo`` attribute of the XML object. + 7. The plugin named ``'foo'`` + 8. An empty string. + + :param string attrib: The name of the requested stanza interface. + """ + if attrib == 'substanzas': + return self.iterables + elif attrib in self.interfaces: + get_method = "get_%s" % attrib.lower() + get_method2 = "get%s" % attrib.title() + + if self.plugin_overrides: + plugin = self.plugin_overrides.get(get_method, None) + if plugin: + if plugin not in self.plugins: + self.init_plugin(plugin) + handler = getattr(self.plugins[plugin], get_method, None) + if handler: + return handler() + + if hasattr(self, get_method): + return getattr(self, get_method)() + elif hasattr(self, get_method2): + return getattr(self, get_method2)() + else: + if attrib in self.sub_interfaces: + return self._get_sub_text(attrib) + else: + return self._get_attr(attrib) + elif attrib in self.plugin_attrib_map: + if attrib not in self.plugins: + self.init_plugin(attrib) + if self.plugins[attrib].is_extension: + return self.plugins[attrib][attrib] + return self.plugins[attrib] + else: + return '' + + def __setitem__(self, attrib, value): + """Set the value of a stanza interface using dictionary-like syntax. + + Example:: + + >>> msg['body'] = "Hi!" + >>> msg['body'] + 'Hi!' + + Stanza interfaces are typically mapped directly to the underlying XML + object, but can be overridden by the presence of a ``set_attrib`` + method (or ``set_foo`` where the interface is named ``'foo'``, etc). + + The effect of interface value assignment for an interface + named ``'foo'`` will be one of: + + 1. Delete the interface's contents if the value is None. + 2. Call the ``set_foo`` override handler, if it exists. + 3. Call ``set_foo``, if it exists. + 4. Call ``setFoo``, if it exists. + 5. Set the text of a ``foo`` element, if ``'foo'`` is + in :attr:`sub_interfaces`. + 6. Set the value of a top level XML attribute named ``foo``. + 7. Attempt to pass the value to a plugin named ``'foo'`` using + the plugin's ``'foo'`` interface. + 8. Do nothing. + + :param string attrib: The name of the stanza interface to modify. + :param value: The new value of the stanza interface. + """ + if attrib in self.interfaces: + if value is not None: + set_method = "set_%s" % attrib.lower() + set_method2 = "set%s" % attrib.title() + + if self.plugin_overrides: + plugin = self.plugin_overrides.get(set_method, None) + if plugin: + if plugin not in self.plugins: + self.init_plugin(plugin) + handler = getattr(self.plugins[plugin], + set_method, None) + if handler: + return handler(value) + + if hasattr(self, set_method): + getattr(self, set_method)(value,) + elif hasattr(self, set_method2): + getattr(self, set_method2)(value,) + else: + if attrib in self.sub_interfaces: + return self._set_sub_text(attrib, text=value) + else: + self._set_attr(attrib, value) + else: + self.__delitem__(attrib) + elif attrib in self.plugin_attrib_map: + if attrib not in self.plugins: + self.init_plugin(attrib) + self.plugins[attrib][attrib] = value + return self + + def __delitem__(self, attrib): + """Delete the value of a stanza interface using dict-like syntax. + + Example:: + + >>> msg['body'] = "Hi!" + >>> msg['body'] + 'Hi!' + >>> del msg['body'] + >>> msg['body'] + '' + + Stanza interfaces are typically mapped directly to the underlyig XML + object, but can be overridden by the presence of a ``del_attrib`` + method (or ``del_foo`` where the interface is named ``'foo'``, etc). + + The effect of deleting a stanza interface value named ``foo`` will be + one of: + + 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 + :attr:`sub_interfaces`. + 5. Delete top level XML attribute named ``foo``. + 6. Remove the ``foo`` plugin, if it was loaded. + 7. Do nothing. + + :param 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 XML object. + + If the new value is None or an empty string, then the attribute will + be removed. + + :param name: The name of the attribute. + :param 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 XML object. + + :param 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 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. + + :param name: The name of the attribute. + :param 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. + + :param name: The name or XPath expression of the element. + :param 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. + + :param name: The name or XPath expression of the element. + :param 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. + :param 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. + + :param name: The name or XPath expression for the element(s) to remove. + :param bool 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-like 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. + + :param string xpath: The XPath expression to check against. It + may be either a string or a list of element + names with attribute checks. + """ + if not isinstance(xpath, list): + 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:: + + Matching on attribute values is not supported in Python 2.6 + or Python 3.1 + + :param string 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:: + + Matching on attribute values is not supported in Python 2.6 + or Python 3.1. + + :param string 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. + + :param string key: The name of the stanza interface to check. + :param 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. + + :param 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. + + :param XML 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. + + :param int 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. + + The format for the tag name is:: + + '{namespace}elementname' + + For example, for the stanza ``<foo xmlns="bar" />``, + ``stanza.tag_name()`` would return ``"{bar}foo"``. + """ + return "{%s}%s" % (cls.namespace, cls.name) + + @property + def attrib(self): + """Return the stanza object 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. + + .. deprecated:: 1.0 + """ + return self + + def _fix_ns(self, xpath, split=False, propagate_ns=True): + return fix_ns(xpath, split=split, + propagate_ns=propagate_ns, + default_ns=self.namespace) + + 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. + + :param ElementBase 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. + + :param ElementBase 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 in this stanza.""" + return len(self.iterables) + + def __iter__(self): + """Return an iterator object for 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. + + .. seealso:: :ref:`tostring` + + :param bool 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 Interfaces:** + + :id: An optional id value that can be used to associate stanzas + :to: A JID object representing the recipient's JID. + :from: A JID object representing the sender's JID. + with their replies. + :type: The type of stanza, typically will be ``'normal'``, + ``'error'``, ``'get'``, or ``'set'``, etc. + :payload: The XML contents of the stanza. + + :param XMLStream stream: Optional :class:`sleekxmpp.xmlstream.XMLStream` + object responsible for sending this stanza. + :param XML xml: Optional XML contents to initialize stanza values. + :param string stype: Optional stanza type value. + :param sto: Optional string or :class:`sleekxmpp.xmlstream.JID` + object of the recipient's JID. + :param sfrom: Optional string or :class:`sleekxmpp.xmlstream.JID` + object of the sender's JID. + :param string sid: Optional ID value for the stanza. + """ + + #: The default XMPP client namespace + namespace = 'jabber:client' + + #: There is a small set of attributes which apply to all XMPP stanzas: + #: the stanza type, the to and from JIDs, the stanza ID, and, especially + #: in the case of an Iq stanza, a payload. + interfaces = set(('type', 'to', 'from', 'id', 'payload')) + + #: A basic set of allowed values for the ``'type'`` interface. + types = set(('get', 'set', 'error', None, 'unavailable', 'normal', 'chat')) + + 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 set_type(self, value): + """Set the stanza's ``'type'`` attribute. + + Only type values contained in :attr:`types` are accepted. + + :param string value: One of the values contained in :attr:`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. + + :param value: A string or :class:`sleekxmpp.xmlstream.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. + + :param 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): + """Prepare the stanza for sending a reply. + + Swaps the ``'from'`` and ``'to'`` attributes. + + 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. + + :param bool 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 if 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. + + :param bool now: Indicates if the queue should be skipped and the + stanza sent immediately. Useful for stream + initialization. Defaults to ``False``. + """ + self.stream.send(self, 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. + + :param bool 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) + + +#: A JSON/dictionary version of the XML content exposed through +#: the stanza interfaces:: +#: +#: >>> msg = Message() +#: >>> msg.values +#: {'body': '', 'from': , 'mucnick': '', 'mucroom': '', +#: 'to': , 'type': 'normal', 'id': '', 'subject': ''} +#: +#: Likewise, assigning to the :attr:`values` will change the XML +#: content:: +#: +#: >>> msg = Message() +#: >>> msg.values = {'body': 'Hi!', 'to': 'user@example.com'} +#: >>> msg +#: '<message to="user@example.com"><body>Hi!</body></message>' +#: +#: Child stanzas are exposed as nested dictionaries. +ElementBase.values = property(ElementBase._get_stanza_values, + ElementBase._set_stanza_values) + + +# 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 |