282 lines
8.5 KiB
Python
282 lines
8.5 KiB
Python
##
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## Copyright (C) 2006 Gajim Team
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##
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## This file is part of Gajim.
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##
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## Gajim is free software; you can redistribute it and/or modify
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## it under the terms of the GNU General Public License as published
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## by the Free Software Foundation; version 3 only.
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##
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## Gajim is distributed in the hope that it will be useful,
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## but WITHOUT ANY WARRANTY; without even the implied warranty of
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## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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## GNU General Public License for more details.
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##
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## You should have received a copy of the GNU General Public License
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## along with Gajim. If not, see <http://www.gnu.org/licenses/>.
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##
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from itertools import *
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import xmpp
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import xmpp.features_nb
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import gajim
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import helpers
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class CapsCache(object):
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''' This object keeps the mapping between caps data and real disco
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features they represent, and provides simple way to query that info.
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It is application-wide, that is there's one object for all
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connections.
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Goals:
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* handle storing/retrieving info from database
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* cache info in memory
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* expose simple interface
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Properties:
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* one object for all connections (move to logger.py?)
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* store info efficiently (a set() of urls -- we can assume there won't be
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too much of these, ensure that (X,Y,Z1) and (X,Y,Z2) has different
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features.
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Connections with other objects: (TODO)
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Interface:
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# object creation
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>>> cc=CapsCache(logger_object)
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>>> caps = ('sha-1', '66/0NaeaBKkwk85efJTGmU47vXI=')
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>>> muc = 'http://jabber.org/protocol/muc'
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>>> chatstates = 'http://jabber.org/protocol/chatstates'
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# setting data
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>>> cc[caps].identities = [{'category':'client', 'type':'pc'}]
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>>> cc[caps].features = [muc]
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# retrieving data
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>>> muc in cc[caps].features
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True
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>>> chatstates in cc[caps].features
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False
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>>> cc[caps].identities
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[{'category': 'client', 'type': 'pc'}]
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>>> x = cc[caps] # more efficient if making several queries for one set of caps
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ATypicalBlackBoxObject
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>>> muc in x.features
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True
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'''
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def __init__(self, logger=None):
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''' Create a cache for entity capabilities. '''
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# our containers:
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# __cache is a dictionary mapping: pair of hash method and hash maps
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# to CapsCacheItem object
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# __CacheItem is a class that stores data about particular
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# client (hash method/hash pair)
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self.__cache = {}
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class CacheItem(object):
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''' TODO: logging data into db '''
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# __names is a string cache; every string long enough is given
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# another object, and we will have plenty of identical long
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# strings. therefore we can cache them
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# TODO: maybe put all known xmpp namespace strings here
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# (strings given in xmpppy)?
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__names = {}
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def __init__(ciself, hash_method, hash):
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# cached into db
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ciself.hash_method = hash_method
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ciself.hash = hash
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ciself._features = []
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ciself._identities = []
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# not cached into db:
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# have we sent the query?
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# 0 == not queried
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# 1 == queried
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# 2 == got the answer
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ciself.queried = 0
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def _get_features(ciself):
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return ciself._features
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def _set_features(ciself, value):
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ciself._features = []
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for feature in value:
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ciself._features.append(ciself.__names.setdefault(feature,
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feature))
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features = property(_get_features, _set_features)
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def _get_identities(ciself):
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list_ = []
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for i in ciself._identities:
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# transforms it back in a dict
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d = dict()
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d['category'] = i[0]
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if i[1]:
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d['type'] = i[1]
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if i[2]:
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d['xml:lang'] = i[2]
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if i[3]:
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d['name'] = i[3]
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list_.append(d)
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return list_
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def _set_identities(ciself, value):
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ciself._identities = []
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for identity in value:
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# dict are not hashable, so transform it into a tuple
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t = (identity['category'], identity.get('type'), identity.get('xml:lang'), identity.get('name'))
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ciself._identities.append(ciself.__names.setdefault(t, t))
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identities = property(_get_identities, _set_identities)
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def update(ciself, identities, features):
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# NOTE: self refers to CapsCache object, not to CacheItem
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ciself.identities=identities
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ciself.features=features
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self.logger.add_caps_entry(ciself.hash_method, ciself.hash,
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identities, features)
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self.__CacheItem = CacheItem
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# prepopulate data which we are sure of; note: we do not log these info
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for account in gajim.connections:
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gajimcaps = self[('sha-1', gajim.caps_hash[accout])]
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gajimcaps.identities = [gajim.gajim_identity]
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gajimcaps.features = gajim.gajim_common_features + \
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gajim.gajim_optional_features[account]
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# start logging data from the net
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self.logger = logger
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def load_from_db(self):
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# get data from logger...
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if self.logger is not None:
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for hash_method, hash, identities, features in \
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self.logger.iter_caps_data():
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x = self[(hash_method, hash)]
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x.identities = identities
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x.features = features
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x.queried = 2
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def __getitem__(self, caps):
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if caps in self.__cache:
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return self.__cache[caps]
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hash_method, hash = caps
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x = self.__CacheItem(hash_method, hash)
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self.__cache[(hash_method, hash)] = x
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return x
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def preload(self, con, jid, node, hash_method, hash):
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''' Preload data about (node, ver, exts) caps using disco
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query to jid using proper connection. Don't query if
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the data is already in cache. '''
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q = self[(hash_method, hash)]
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if q.queried==0:
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# do query for bare node+hash pair
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# this will create proper object
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q.queried=1
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con.discoverInfo(jid, '%s#%s' % (node, hash))
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def is_supported(self, contact, feature):
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# No resource -> can't have any caps
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if not contact or not contact.resource:
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return False
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# Unfortunately, if all resources are offline, the contact
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# includes the last resource that was online. Check for its
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# show, so we can be sure it's existant. Otherwise, we still
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# return caps for a contact that has no resources left.
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if contact.show == 'offline':
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return False
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# FIXME: We assume everything is supported if we got no caps.
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# This is the "Asterix way", after 0.12 release, I will
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# likely implement a fallback to disco (could be disabled
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# for mobile users who pay for traffic)
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features = self[(contact.caps_hash_method,
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contact.caps_hash)].features
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if feature in features or features == []:
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return True
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return False
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gajim.capscache = CapsCache(gajim.logger)
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class ConnectionCaps(object):
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''' This class highly depends on that it is a part of Connection class. '''
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def _capsPresenceCB(self, con, presence):
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''' Handle incoming presence stanzas... This is a callback
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for xmpp registered in connection_handlers.py'''
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# we will put these into proper Contact object and ask
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# for disco... so that disco will learn how to interpret
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# these caps
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jid = helpers.get_full_jid_from_iq(presence)
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contact = gajim.contacts.get_contact_from_full_jid(
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self.name, jid)
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if contact is None:
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room_jid, nick = gajim.get_room_and_nick_from_fjid(jid)
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contact = gajim.contacts.get_gc_contact(
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self.name, room_jid, nick)
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if contact is None:
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# TODO: a way to put contact not-in-roster
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# into Contacts
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return
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# get the caps element
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caps = presence.getTag('c')
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if not caps:
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contact.caps_node = None
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contact.caps_hash = None
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contact.hash_method = None
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return
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hash_method, node, hash = \
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caps['hash'], caps['node'], caps['ver']
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if hash_method is None or node is None or hash is None:
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# improper caps in stanza, ignoring
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contact.caps_node = None
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contact.caps_hash = None
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contact.hash_method = None
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return
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# start disco query...
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gajim.capscache.preload(self, jid, node, hash_method, hash)
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# overwriting old data
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contact.caps_node = node
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contact.caps_hash_method = hash_method
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contact.caps_hash = hash
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def _capsDiscoCB(self, jid, node, identities, features, dataforms):
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contact = gajim.contacts.get_contact_from_full_jid(self.name, jid)
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if not contact:
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room_jid, nick = gajim.get_room_and_nick_from_fjid(jid)
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contact = gajim.contacts.get_gc_contact(self.name, room_jid, nick)
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if contact is None:
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return
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if not contact.caps_node:
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return # we didn't asked for that?
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if not node.startswith(contact.caps_node + '#'):
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return
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node, hash = node.split('#', 1)
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computed_hash = helpers.compute_caps_hash(identities, features,
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dataforms=dataforms, hash_method=contact.caps_hash_method)
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if computed_hash != hash:
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# wrong hash, forget it
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contact.caps_node = ''
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contact.caps_hash_method = ''
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contact.caps_hash = ''
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return
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# if we don't have this info already...
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caps = gajim.capscache[(contact.caps_hash_method, hash)]
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if caps.queried == 2:
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return
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caps.update(identities, features)
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# vim: se ts=3: |