""" SleekXMPP: The Sleek XMPP Library Copyright (C) 2010 Nathanael C. Fritz This file is part of SleekXMPP. See the file LICENSE for copying permission. """ 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. Arguments: stanza -- The class of the parent stanza. plugin -- The class of the plugin stanza. iterable -- Indicates if the plugin stanza should be included in the parent stanza's iterable 'substanzas' interface results. overrides -- Indicates if the plugin should be allowed to override the interface handlers for the parent stanza. """ tag = "{%s}%s" % (plugin.namespace, plugin.name) stanza.plugin_attrib_map[plugin.plugin_attrib] = plugin stanza.plugin_tag_map[tag] = plugin if iterable: # Prevent weird memory reference gotchas. stanza.plugin_iterables = stanza.plugin_iterables.copy() stanza.plugin_iterables.add(plugin) if overrides: # Prevent weird memory reference gotchas. stanza.plugin_overrides = stanza.plugin_overrides.copy() 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 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 the value is_extension = 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' Class Attributes: name -- The name of the stanza's main element. namespace -- The namespace of the stanza's main element. interfaces -- A set of attribute and element names that may be accessed using dictionary syntax. sub_interfaces -- A subset of the set of interfaces which map to subelements instead of attributes. subitem -- A set of stanza classes which are allowed to be added as substanzas. Deprecated version of plugin_iterables. overrides -- A list of interfaces prepended with 'get_', 'set_', or 'del_'. If the stanza is registered as a plugin with overrides=True, then the parent's interface handlers will be overridden by the plugin's matching handler. types -- A set of generic type attribute values. tag -- The namespaced name of the stanza's root element. Example: "{foo_ns}bar" plugin_attrib -- The interface name that the stanza uses to be accessed as a plugin from another stanza. plugin_attrib_map -- A mapping of plugin attribute names with the associated plugin stanza classes. plugin_iterables -- A set of stanza classes which are allowed to be added as substanzas. plugin_overrides -- A mapping of interfaces prepended with 'get_', 'set_' or 'del_' to plugin attrib names. Allows a plugin to override the behaviour of a parent stanza's interface handlers. plugin_tag_map -- A mapping of plugin stanza tag names with the associated plugin stanza classes. is_extension -- When True, allows the stanza to provide one additional interface to the parent stanza, extending the interfaces supported by the parent. Defaults to False. xml_ns -- The XML namespace, http://www.w3.org/XML/1998/namespace, for use with xml:lang values. Instance Attributes: xml -- The stanza's XML contents. parent -- The parent stanza of this stanza. plugins -- A map of enabled plugin names with the initialized plugin stanza objects. values -- A dictionary of the stanza's interfaces and interface values, including plugins. Class Methods tag_name -- Return the namespaced version of the stanza's root element's name. Methods: setup -- Initialize the stanza's XML contents. enable -- Instantiate a stanza plugin. Alias for init_plugin. init_plugin -- Instantiate a stanza plugin. _get_stanza_values -- Return a dictionary of stanza interfaces and their values. _set_stanza_values -- Set stanza interface values given a dictionary of interfaces and values. __getitem__ -- Return the value of a stanza interface. __setitem__ -- Set the value of a stanza interface. __delitem__ -- Remove the value of a stanza interface. _set_attr -- Set an attribute value of the main stanza element. _del_attr -- Remove an attribute from the main stanza element. _get_attr -- Return an attribute's value from the main stanza element. _get_sub_text -- Return the text contents of a subelement. _set_sub_text -- Set the text contents of a subelement. _del_sub -- Remove a subelement. match -- Compare the stanza against an XPath expression. find -- Return subelement matching an XPath expression. findall -- Return subelements matching an XPath expression. get -- Return the value of a stanza interface, with an optional default value. keys -- Return the set of interface names accepted by the stanza. append -- Add XML content or a substanza to the stanza. appendxml -- Add XML content to the stanza. pop -- Remove a substanza. next -- Return the next iterable substanza. clear -- Reset the stanza's XML contents. _fix_ns -- Apply the stanza's namespace to non-namespaced elements in an XPath expression. """ name = 'stanza' plugin_attrib = 'plugin' namespace = 'jabber:client' interfaces = set(('type', 'to', 'from', 'id', 'payload')) types = set(('get', 'set', 'error', None, 'unavailable', 'normal', 'chat')) sub_interfaces = tuple() overrides = {} plugin_attrib_map = {} plugin_overrides = {} plugin_iterables = set() plugin_tag_map = {} subitem = set() is_extension = False xml_ns = 'http://www.w3.org/XML/1998/namespace' def __init__(self, xml=None, parent=None): """ Create a new stanza object. Arguments: xml -- Initialize the stanza with optional existing XML. parent -- Optional stanza object that contains this stanza. """ self.xml = xml self.plugins = OrderedDict() self.iterables = [] self._index = 0 self.tag = self.tag_name() if parent is None: self.parent = None else: self.parent = weakref.ref(parent) ElementBase.values = property(ElementBase._get_stanza_values, ElementBase._set_stanza_values) 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 = self.plugin_tag_map[child.tag] self.plugins[plugin.plugin_attrib] = plugin(child, self) for sub in self.plugin_iterables: if child.tag == "{%s}%s" % (sub.namespace, sub.name): self.iterables.append(sub(child, self)) break def setup(self, xml=None): """ Initialize the stanza's XML contents. Will return True if XML was generated according to the stanza's definition. Arguments: xml -- Optional XML object to use for the stanza's content instead of generating 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 init_plugin. Arguments: attrib -- The stanza interface for the plugin. """ return self.init_plugin(attrib) def init_plugin(self, attrib): """ Enable and initialize a stanza plugin. Arguments: attrib -- The stanza interface for the plugin. """ if attrib not in self.plugins: plugin_class = self.plugin_attrib_map[attrib] self.plugins[attrib] = plugin_class(parent=self) return self def _get_stanza_values(self): """ Return a dictionary of the stanza's interface values. Stanza plugin values are included as nested dictionaries. """ 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. Arguments: values -- A dictionary mapping stanza interface with values. Plugin interfaces may accept a nested dictionary that will be used recursively. """ 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 dictionary-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. 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 a sub interface. 6. The value of the foo attribute of the XML object. 7. The plugin named 'foo' 8. An empty string. Arguments: 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 sub_interfaces. 6. Set the value of a top level XML attribute name foo. 7. Attempt to pass value to a plugin named foo using the plugin's foo interface. 8. Do nothing. Arguments: attrib -- The name of the stanza interface to modify. 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 dictionary-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 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