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