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SleekXMPP/sleekxmpp/plugins/xep_0030/disco.py
Lance Stout 4b1fadde4b Updated XEP-0128 plugin to work with the new XEP-0030 plugin. 
Required fixing a few bugs in StanzaBase related to iterable
substanzas.
2011-03-22 20:42:43 -04:00

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"""
SleekXMPP: The Sleek XMPP Library
Copyright (C) 2010 Nathanael C. Fritz, Lance J.T. Stout
This file is part of SleekXMPP.
See the file LICENSE for copying permission.
"""
import logging
import sleekxmpp
from sleekxmpp import Iq
from sleekxmpp.exceptions import XMPPError
from sleekxmpp.plugins.base import base_plugin
from sleekxmpp.xmlstream.handler import Callback
from sleekxmpp.xmlstream.matcher import StanzaPath
from sleekxmpp.xmlstream import register_stanza_plugin, ElementBase, ET, JID
from sleekxmpp.plugins.xep_0030 import DiscoInfo, DiscoItems, StaticDisco
log = logging.getLogger(__name__)
class xep_0030(base_plugin):
"""
XEP-0030: Service Discovery
Service discovery in XMPP allows entities to discover information about
other agents in the network, such as the feature sets supported by a
client, or signposts to other, related entities.
Also see <http://www.xmpp.org/extensions/xep-0030.html>.
The XEP-0030 plugin works using a hierarchy of dynamic
node handlers, ranging from global handlers to specific
JID+node handlers. The default set of handlers operate
in a static manner, storing disco information in memory.
However, custom handlers may use any available backend
storage mechanism desired, such as SQLite or Redis.
Node handler hierarchy:
JID | Node | Level
---------------------
None | None | Global
Given | None | All nodes for the JID
None | Given | Node on self.xmpp.boundjid
Given | Given | A single node
Stream Handlers:
Disco Info -- Any Iq stanze that includes a query with the
namespace http://jabber.org/protocol/disco#info.
Disco Items -- Any Iq stanze that includes a query with the
namespace http://jabber.org/protocol/disco#items.
Events:
disco_info -- Received a disco#info Iq query result.
disco_items -- Received a disco#items Iq query result.
disco_info_query -- Received a disco#info Iq query request.
disco_items_query -- Received a disco#items Iq query request.
Attributes:
stanza -- A reference to the module containing the
stanza classes provided by this plugin.
static -- Object containing the default set of
static node handlers.
default_handlers -- A dictionary mapping operations to the default
global handler (by default, the static handlers).
xmpp -- The main SleekXMPP object.
Methods:
set_node_handler -- Assign a handler to a JID/node combination.
del_node_handler -- Remove a handler from a JID/node combination.
get_info -- Retrieve disco#info data, locally or remote.
get_items -- Retrieve disco#items data, locally or remote.
set_identities --
set_features --
set_items --
del_items --
del_identity --
del_feature --
del_item --
add_identity --
add_feature --
add_item --
"""
def plugin_init(self):
"""
Start the XEP-0030 plugin.
"""
self.xep = '0030'
self.description = 'Service Discovery'
self.stanza = sleekxmpp.plugins.xep_0030.stanza
self.xmpp.register_handler(
Callback('Disco Info',
StanzaPath('iq/disco_info'),
self._handle_disco_info))
self.xmpp.register_handler(
Callback('Disco Items',
StanzaPath('iq/disco_items'),
self._handle_disco_items))
register_stanza_plugin(Iq, DiscoInfo)
register_stanza_plugin(Iq, DiscoItems)
self.static = StaticDisco(self.xmpp)
self._disco_ops = ['get_info', 'set_identities', 'set_features',
'get_items', 'set_items', 'del_items',
'add_identity', 'del_identity', 'add_feature',
'del_feature', 'add_item', 'del_item',
'del_identities', 'del_features']
self.default_handlers = {}
self._handlers = {}
for op in self._disco_ops:
self._add_disco_op(op, getattr(self.static, op))
def post_init(self):
"""Handle cross-plugin dependencies."""
base_plugin.post_init(self)
if 'xep_0059' in self.xmpp.plugin:
register_stanza_plugin(DiscoItems,
self.xmpp['xep_0059'].stanza.Set)
def _add_disco_op(self, op, default_handler):
self.default_handlers[op] = default_handler
self._handlers[op] = {'global': default_handler,
'jid': {},
'node': {}}
def set_node_handler(self, htype, jid=None, node=None, handler=None):
"""
Add a node handler for the given hierarchy level and
handler type.
Node handlers are ordered in a hierarchy where the
most specific handler is executed. Thus, a fallback,
global handler can be used for the majority of cases
with a few node specific handler that override the
global behavior.
Node handler hierarchy:
JID | Node | Level
---------------------
None | None | Global
Given | None | All nodes for the JID
None | Given | Node on self.xmpp.boundjid
Given | Given | A single node
Handler types:
get_info
get_items
set_identities
set_features
set_items
del_items
del_identities
del_identity
del_feature
del_features
del_item
add_identity
add_feature
add_item
Arguments:
htype -- The operation provided by the handler.
jid -- The JID the handler applies to. May be narrowed
further if a node is given.
node -- The particular node the handler is for. If no JID
is given, then the self.xmpp.boundjid.full is
assumed.
handler -- The handler function to use.
"""
if htype not in self._disco_ops:
return
if jid is None and node is None:
self._handlers[htype]['global'] = handler
elif node is None:
self._handlers[htype]['jid'][jid] = handler
elif jid is None:
if self.xmpp.is_component:
jid = self.xmpp.boundjid.full
else:
jid = self.xmpp.boundjid.bare
self._handlers[htype]['node'][(jid, node)] = handler
else:
self._handlers[htype]['node'][(jid, node)] = handler
def del_node_handler(self, htype, jid, node):
"""
Remove a handler type for a JID and node combination.
The next handler in the hierarchy will be used if one
exists. If removing the global handler, make sure that
other handlers exist to process existing nodes.
Node handler hierarchy:
JID | Node | Level
---------------------
None | None | Global
Given | None | All nodes for the JID
None | Given | Node on self.xmpp.boundjid
Given | Given | A single node
Arguments:
htype -- The type of handler to remove.
jid -- The JID from which to remove the handler.
node -- The node from which to remove the handler.
"""
self.set_node_handler(htype, jid, node, None)
def restore_defaults(self, jid=None, node=None, handlers=None):
"""
Change all or some of a node's handlers to the default
handlers. Useful for manually overriding the contents
of a node that would otherwise be handled by a JID level
or global level dynamic handler.
The default is to use the built-in static handlers, but that
may be changed by modifying self.default_handlers.
Arguments:
jid -- The JID owning the node to modify.
node -- The node to change to using static handlers.
handlers -- Optional list of handlers to change to the
default version. If provided, only these
handlers will be changed. Otherwise, all
handlers will use the default version.
"""
if handlers is None:
handlers = self._disco_ops
for op in handlers:
self.del_node_handler(op, jid, node)
self.set_node_handler(op, jid, node, self.default_handlers[op])
def get_info(self, jid=None, node=None, local=False, **kwargs):
"""
Retrieve the disco#info results from a given JID/node combination.
Info may be retrieved from both local resources and remote agents;
the local parameter indicates if the information should be gathered
by executing the local node handlers, or if a disco#info stanza
must be generated and sent.
If requesting items from a local JID/node, then only a DiscoInfo
stanza will be returned. Otherwise, an Iq stanza will be returned.
Arguments:
jid -- Request info from this JID.
node -- The particular node to query.
local -- If true, then the query is for a JID/node
combination handled by this Sleek instance and
no stanzas need to be sent.
Otherwise, a disco stanza must be sent to the
remove JID to retrieve the info.
ifrom -- Specifiy the sender's JID.
block -- If true, block and wait for the stanzas' reply.
timeout -- The time in seconds to block while waiting for
a reply. If None, then wait indefinitely. The
timeout value is only used when block=True.
callback -- Optional callback to execute when a reply is
received instead of blocking and waiting for
the reply.
"""
if local or jid is None:
log.debug("Looking up local disco#info data " + \
"for %s, node %s." % (jid, node))
info = self._run_node_handler('get_info', jid, node, kwargs)
return self._fix_default_info(info)
iq = self.xmpp.Iq()
# Check dfrom parameter for backwards compatibility
iq['from'] = kwargs.get('ifrom', kwargs.get('dfrom', ''))
iq['to'] = jid
iq['type'] = 'get'
iq['disco_info']['node'] = node if node else ''
return iq.send(timeout=kwargs.get('timeout', None),
block=kwargs.get('block', True),
callback=kwargs.get('callback', None))
def get_items(self, jid=None, node=None, local=False, **kwargs):
"""
Retrieve the disco#items results from a given JID/node combination.
Items may be retrieved from both local resources and remote agents;
the local parameter indicates if the items should be gathered by
executing the local node handlers, or if a disco#items stanza must
be generated and sent.
If requesting items from a local JID/node, then only a DiscoItems
stanza will be returned. Otherwise, an Iq stanza will be returned.
Arguments:
jid -- Request info from this JID.
node -- The particular node to query.
local -- If true, then the query is for a JID/node
combination handled by this Sleek instance and
no stanzas need to be sent.
Otherwise, a disco stanza must be sent to the
remove JID to retrieve the items.
ifrom -- Specifiy the sender's JID.
block -- If true, block and wait for the stanzas' reply.
timeout -- The time in seconds to block while waiting for
a reply. If None, then wait indefinitely.
callback -- Optional callback to execute when a reply is
received instead of blocking and waiting for
the reply.
iterator -- If True, return a result set iterator using
the XEP-0059 plugin, if the plugin is loaded.
Otherwise the parameter is ignored.
"""
if local or jid is None:
return self._run_node_handler('get_items', jid, node, kwargs)
iq = self.xmpp.Iq()
# Check dfrom parameter for backwards compatibility
iq['from'] = kwargs.get('ifrom', kwargs.get('dfrom', ''))
iq['to'] = jid
iq['type'] = 'get'
iq['disco_items']['node'] = node if node else ''
if kwargs.get('iterator', False) and self.xmpp['xep_0059']:
return self.xmpp['xep_0059'].iterate(iq, 'disco_items')
else:
return iq.send(timeout=kwargs.get('timeout', None),
block=kwargs.get('block', True),
callback=kwargs.get('callback', None))
def set_items(self, jid=None, node=None, **kwargs):
"""
Set or replace all items for the specified JID/node combination.
The given items must be in a list or set where each item is a
tuple of the form: (jid, node, name).
Arguments:
jid -- The JID to modify.
node -- Optional node to modify.
items -- A series of items in tuple format.
"""
self._run_node_handler('set_items', jid, node, kwargs)
def del_items(self, jid=None, node=None, **kwargs):
"""
Remove all items from the given JID/node combination.
Arguments:
jid -- The JID to modify.
node -- Optional node to modify.
"""
self._run_node_handler('del_items', jid, node, kwargs)
def add_item(self, jid='', name='', node=None, subnode='', ijid=None):
"""
Add a new item element to the given JID/node combination.
Each item is required to have a JID, but may also specify
a node value to reference non-addressable entities.
Arguments:
jid -- The JID for the item.
name -- Optional name for the item.
node -- The node to modify.
subnode -- Optional node for the item.
ijid -- The JID to modify.
"""
if not jid:
jid = self.xmpp.boundjid.full
kwargs = {'ijid': jid,
'name': name,
'inode': subnode}
self._run_node_handler('add_item', ijid, node, kwargs)
def del_item(self, jid=None, node=None, **kwargs):
"""
Remove a single item from the given JID/node combination.
Arguments:
jid -- The JID to modify.
node -- The node to modify.
ijid -- The item's JID.
inode -- The item's node.
"""
self._run_node_handler('del_item', jid, node, kwargs)
def add_identity(self, category='', itype='', name='',
node=None, jid=None, lang=None):
"""
Add a new identity to the given JID/node combination.
Each identity must be unique in terms of all four identity
components: category, type, name, and language.
Multiple, identical category/type pairs are allowed only
if the xml:lang values are different. Likewise, multiple
category/type/xml:lang pairs are allowed so long as the
names are different. A category and type is always required.
Arguments:
category -- The identity's category.
itype -- The identity's type.
name -- Optional name for the identity.
lang -- Optional two-letter language code.
node -- The node to modify.
jid -- The JID to modify.
"""
kwargs = {'category': category,
'itype': itype,
'name': name,
'lang': lang}
self._run_node_handler('add_identity', jid, node, kwargs)
def add_feature(self, feature, node=None, jid=None):
"""
Add a feature to a JID/node combination.
Arguments:
feature -- The namespace of the supported feature.
node -- The node to modify.
jid -- The JID to modify.
"""
kwargs = {'feature': feature}
self._run_node_handler('add_feature', jid, node, kwargs)
def del_identity(self, jid=None, node=None, **kwargs):
"""
Remove an identity from the given JID/node combination.
Arguments:
jid -- The JID to modify.
node -- The node to modify.
category -- The identity's category.
itype -- The identity's type value.
name -- Optional, human readable name for the identity.
lang -- Optional, the identity's xml:lang value.
"""
self._run_node_handler('del_identity', jid, node, kwargs)
def del_feature(self, jid=None, node=None, **kwargs):
"""
Remove a feature from a given JID/node combination.
Arguments:
jid -- The JID to modify.
node -- The node to modify.
feature -- The feature's namespace.
"""
self._run_node_handler('del_feature', jid, node, kwargs)
def set_identities(self, jid=None, node=None, **kwargs):
"""
Add or replace all identities for the given JID/node combination.
The identities must be in a set where each identity is a tuple
of the form: (category, type, lang, name)
Arguments:
jid -- The JID to modify.
node -- The node to modify.
identities -- A set of identities in tuple form.
lang -- Optional, xml:lang value.
"""
self._run_node_handler('set_identities', jid, node, kwargs)
def del_identities(self, jid=None, node=None, **kwargs):
"""
Remove all identities for a JID/node combination.
If a language is specified, only identities using that
language will be removed.
Arguments:
jid -- The JID to modify.
node -- The node to modify.
lang -- Optional. If given, only remove identities
using this xml:lang value.
"""
self._run_node_handler('del_identities', jid, node, kwargs)
def set_features(self, jid=None, node=None, **kwargs):
"""
Add or replace the set of supported features
for a JID/node combination.
Arguments:
jid -- The JID to modify.
node -- The node to modify.
features -- The new set of supported features.
"""
self._run_node_handler('set_features', jid, node, kwargs)
def del_features(self, jid=None, node=None, **kwargs):
"""
Remove all features from a JID/node combination.
Arguments:
jid -- The JID to modify.
node -- The node to modify.
"""
self._run_node_handler('del_features', jid, node, kwargs)
def _run_node_handler(self, htype, jid, node, data={}):
"""
Execute the most specific node handler for the given
JID/node combination.
Arguments:
htype -- The handler type to execute.
jid -- The JID requested.
node -- The node requested.
data -- Optional, custom data to pass to the handler.
"""
if jid is None:
if self.xmpp.is_component:
jid = self.xmpp.boundjid.full
else:
jid = self.xmpp.boundjid.bare
if node is None:
node = ''
if self._handlers[htype]['node'].get((jid, node), False):
return self._handlers[htype]['node'][(jid, node)](jid, node, data)
elif self._handlers[htype]['jid'].get(jid, False):
return self._handlers[htype]['jid'][jid](jid, node, data)
elif self._handlers[htype]['global']:
return self._handlers[htype]['global'](jid, node, data)
else:
return None
def _handle_disco_info(self, iq):
"""
Process an incoming disco#info stanza. If it is a get
request, find and return the appropriate identities
and features. If it is an info result, fire the
disco_info event.
Arguments:
iq -- The incoming disco#items stanza.
"""
if iq['type'] == 'get':
log.debug("Received disco info query from " + \
"<%s> to <%s>." % (iq['from'], iq['to']))
if self.xmpp.is_component:
jid = iq['to'].full
else:
jid = iq['to'].bare
info = self._run_node_handler('get_info',
jid,
iq['disco_info']['node'],
iq)
iq.reply()
if info:
info = self._fix_default_info(info)
iq.set_payload(info.xml)
iq.send()
elif iq['type'] == 'result':
log.debug("Received disco info result from" + \
"%s to %s." % (iq['from'], iq['to']))
self.xmpp.event('disco_info', iq)
def _handle_disco_items(self, iq):
"""
Process an incoming disco#items stanza. If it is a get
request, find and return the appropriate items. If it
is an items result, fire the disco_items event.
Arguments:
iq -- The incoming disco#items stanza.
"""
if iq['type'] == 'get':
log.debug("Received disco items query from " + \
"<%s> to <%s>." % (iq['from'], iq['to']))
if self.xmpp.is_component:
jid = iq['to'].full
else:
jid = iq['to'].bare
items = self._run_node_handler('get_items',
jid,
iq['disco_items']['node'])
iq.reply()
if items:
iq.set_payload(items.xml)
iq.send()
elif iq['type'] == 'result':
log.debug("Received disco items result from" + \
"%s to %s." % (iq['from'], iq['to']))
self.xmpp.event('disco_items', iq)
def _fix_default_info(self, info):
"""
Disco#info results for a JID are required to include at least
one identity and feature. As a default, if no other identity is
provided, SleekXMPP will use either the generic component or the
bot client identity. A the standard disco#info feature will also be
added if no features are provided.
Arguments:
info -- The disco#info quest (not the full Iq stanza) to modify.
"""
if not info['node']:
if not info['identities']:
if self.xmpp.is_component:
log.debug("No identity found for this entity." + \
"Using default component identity.")
info.add_identity('component', 'generic')
else:
log.debug("No identity found for this entity." + \
"Using default client identity.")
info.add_identity('client', 'bot')
if not info['features']:
log.debug("No features found for this entity." + \
"Using default disco#info feature.")
info.add_feature(info.namespace)
return info
# Retain some backwards compatibility
xep_0030.getInfo = xep_0030.get_info
xep_0030.getItems = xep_0030.get_items
xep_0030.make_static = xep_0030.restore_defaults
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