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"""
SleekXMPP: The Sleek XMPP Library
Copyright (C) 2010 Nathanael C. Fritz
This file is part of SleekXMPP.
See the file LICENSE for copying permission.
"""
from sleekxmpp.stanza import Error
from sleekxmpp.stanza.rootstanza import RootStanza
from sleekxmpp.xmlstream import StanzaBase, ET
from sleekxmpp.xmlstream.handler import Waiter, Callback
from sleekxmpp.xmlstream.matcher import MatcherId
from sleekxmpp.exceptions import IqTimeout, IqError
class Iq(RootStanza):
"""
XMPP <iq> stanzas, or info/query stanzas, are XMPP's method of
requesting and modifying information, similar to HTTP's GET and
POST methods.
Each <iq> stanza must have an 'id' value which associates the
stanza with the response stanza. XMPP entities must always
be given a response <iq> stanza with a type of 'result' after
sending a stanza of type 'get' or 'set'.
Most uses cases for <iq> stanzas will involve adding a <query>
element whose namespace indicates the type of information
desired. However, some custom XMPP applications use <iq> stanzas
as a carrier stanza for an application-specific protocol instead.
Example <iq> Stanzas:
<iq to="user@example.com" type="get" id="314">
<query xmlns="http://jabber.org/protocol/disco#items" />
</iq>
<iq to="user@localhost" type="result" id="17">
<query xmlns='jabber:iq:roster'>
<item jid='otheruser@example.net'
name='John Doe'
subscription='both'>
<group>Friends</group>
</item>
</query>
</iq>
Stanza Interface:
query -- The namespace of the <query> element if one exists.
Attributes:
types -- May be one of: get, set, result, or error.
Methods:
__init__ -- Overrides StanzaBase.__init__.
unhandled -- Send error if there are no handlers.
set_payload -- Overrides StanzaBase.set_payload.
set_query -- Add or modify a <query> element.
get_query -- Return the namespace of the <query> element.
del_query -- Remove the <query> element.
reply -- Overrides StanzaBase.reply
send -- Overrides StanzaBase.send
"""
namespace = 'jabber:client'
name = 'iq'
interfaces = set(('type', 'to', 'from', 'id', 'query'))
types = set(('get', 'result', 'set', 'error'))
plugin_attrib = name
def __init__(self, *args, **kwargs):
"""
Initialize a new <iq> stanza with an 'id' value.
Overrides StanzaBase.__init__.
"""
StanzaBase.__init__(self, *args, **kwargs)
if self['id'] == '':
if self.stream is not None:
self['id'] = self.stream.new_id()
else:
self['id'] = '0'
def unhandled(self):
"""
Send a feature-not-implemented error if the stanza is not handled.
Overrides StanzaBase.unhandled.
"""
if self['type'] in ('get', 'set'):
self.reply()
self['error']['condition'] = 'feature-not-implemented'
self['error']['text'] = 'No handlers registered for this request.'
self.send()
def set_payload(self, value):
"""
Set the XML contents of the <iq> stanza.
Arguments:
value -- An XML object to use as the <iq> stanza's contents
"""
self.clear()
StanzaBase.set_payload(self, value)
return self
def set_query(self, value):
"""
Add or modify a <query> element.
Query elements are differentiated by their namespace.
Arguments:
value -- The namespace of the <query> element.
"""
query = self.xml.find("{%s}query" % value)
if query is None and value:
self.clear()
query = ET.Element("{%s}query" % value)
self.xml.append(query)
return self
def get_query(self):
"""Return the namespace of the <query> element."""
for child in self.xml.getchildren():
if child.tag.endswith('query'):
ns = child.tag.split('}')[0]
if '{' in ns:
ns = ns[1:]
return ns
return ''
def del_query(self):
"""Remove the <query> element."""
for child in self.xml.getchildren():
if child.tag.endswith('query'):
self.xml.remove(child)
return self
def reply(self, clear=True):
"""
Send a reply <iq> stanza.
Overrides StanzaBase.reply
Sets the 'type' to 'result' in addition to the default
StanzaBase.reply behavior.
Arguments:
clear -- Indicates if existing content should be
removed before replying. Defaults to True.
"""
self['type'] = 'result'
StanzaBase.reply(self, clear)
return self
def send(self, block=True, timeout=None, callback=None, now=False):
"""
Send an <iq> stanza over the XML stream.
The send call can optionally block until a response is received or
a timeout occurs. Be aware that using blocking in non-threaded event
handlers can drastically impact performance. Otherwise, a callback
handler can be provided that will be executed when the Iq stanza's
result reply is received. Be aware though that that the callback
handler will not be executed in its own thread.
Using both block and callback is not recommended, and only the
callback argument will be used in that case.
Overrides StanzaBase.send
Arguments:
block -- Specify if the send call will block until a response
is received, or a timeout occurs. Defaults to True.
timeout -- The length of time (in seconds) to wait for a response
before exiting the send call if blocking is used.
Defaults to sleekxmpp.xmlstream.RESPONSE_TIMEOUT
callback -- Optional reference to a stream handler function. Will
be executed when a reply stanza is received.
now -- Indicates if the send queue should be skipped and send
the stanza immediately. Used during stream
initialization. Defaults to False.
"""
if timeout is None:
timeout = self.stream.response_timeout
if callback is not None and self['type'] in ('get', 'set'):
handler_name = 'IqCallback_%s' % self['id']
handler = Callback(handler_name,
MatcherId(self['id']),
callback,
once=True)
self.stream.register_handler(handler)
StanzaBase.send(self, now=now)
return handler_name
elif block and self['type'] in ('get', 'set'):
waitfor = Waiter('IqWait_%s' % self['id'], MatcherId(self['id']))
self.stream.register_handler(waitfor)
StanzaBase.send(self, now=now)
result = waitfor.wait(timeout)
if not result:
raise IqTimeout()
if result['type'] == 'error':
raise IqError(result)
return result
else:
return StanzaBase.send(self, now=now)
def _set_stanza_values(self, values):
"""
Set multiple stanza interface values using a dictionary.
Stanza plugin values may be set usind nested dictionaries.
If the interface 'query' is given, then it will be set
last to avoid duplication of the <query /> element.
Overrides ElementBase._set_stanza_values.
Arguments:
values -- A dictionary mapping stanza interface with values.
Plugin interfaces may accept a nested dictionary that
will be used recursively.
"""
query = values.get('query', '')
if query:
del values['query']
StanzaBase._set_stanza_values(self, values)
self['query'] = query
else:
StanzaBase._set_stanza_values(self, values)
return self
# To comply with PEP8, method names now use underscores.
# Deprecated method names are re-mapped for backwards compatibility.
Iq.setPayload = Iq.set_payload
Iq.getQuery = Iq.get_query
Iq.setQuery = Iq.set_query
Iq.delQuery = Iq.del_query
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