a71823dc04
This was XEP-0237, but is now part of RFC 6121.
Roster backends should now expose two additional methods:
version(jid):
Return the version of the given JID's roster.
set_version(jid, version):
Update the version of the given JID's roster.
A new state field will be passed to the backend if an item
has been marked for removal. This is 'removed' which will
be set to True.
501 lines
20 KiB
Python
501 lines
20 KiB
Python
"""
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SleekXMPP: The Sleek XMPP Library
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Copyright (C) 2010 Nathanael C. Fritz
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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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class RosterItem(object):
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"""
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A RosterItem is a single entry in a roster node, and tracks
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the subscription state and user annotations of a single JID.
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Roster items may use an external datastore to persist roster data
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across sessions. Client applications will not need to use this
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functionality, but is intended for components that do not have their
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roster persisted automatically by the XMPP server.
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Roster items provide many methods for handling incoming presence
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stanzas that ensure that response stanzas are sent according to
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RFC 3921.
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The external datastore is accessed through a provided interface
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object which is stored in self.db. The interface object MUST
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provide two methods: load and save, both of which are responsible
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for working with a single roster item. A private dictionary,
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self._db_state, is used to store any metadata needed by the
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interface, such as the row ID of a roster item, etc.
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Interface for self.db.load:
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load(owner_jid, jid, db_state):
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owner_jid -- The JID that owns the roster.
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jid -- The JID of the roster item.
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db_state -- A dictionary containing any data saved
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by the interface object after a save()
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call. Will typically have the equivalent
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of a 'row_id' value.
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Interface for self.db.save:
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save(owner_jid, jid, item_state, db_state):
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owner_jid -- The JID that owns the roster.
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jid -- The JID of the roster item.
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item_state -- A dictionary containing the fields:
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'from', 'to', 'pending_in', 'pending_out',
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'whitelisted', 'subscription', 'name',
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and 'groups'.
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db_state -- A dictionary provided for persisting
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datastore specific information. Typically,
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a value equivalent to 'row_id' will be
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stored here.
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State Fields:
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from -- Indicates if a subscription of type 'from'
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has been authorized.
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to -- Indicates if a subscription of type 'to' has
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been authorized.
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pending_in -- Indicates if a subscription request has been
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received from this JID and it has not been
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authorized yet.
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pending_out -- Indicates if a subscription request has been sent
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to this JID and it has not been accepted yet.
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subscription -- Returns one of: 'to', 'from', 'both', or 'none'
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based on the states of from, to, pending_in,
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and pending_out. Assignment to this value does
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not affect the states of the other values.
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whitelisted -- Indicates if a subscription request from this
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JID should be automatically accepted.
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name -- A user supplied alias for the JID.
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groups -- A list of group names for the JID.
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Attributes:
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xmpp -- The main SleekXMPP instance.
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owner -- The JID that owns the roster.
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jid -- The JID for the roster item.
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db -- Optional datastore interface object.
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last_status -- The last presence sent to this JID.
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resources -- A dictionary of online resources for this JID.
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Will contain the fields 'show', 'status',
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and 'priority'.
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Methods:
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load -- Retrieve the roster item from an
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external datastore, if one was provided.
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save -- Save the roster item to an external
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datastore, if one was provided.
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remove -- Remove a subscription to the JID and revoke
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its whitelisted status.
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subscribe -- Subscribe to the JID.
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authorize -- Accept a subscription from the JID.
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unauthorize -- Deny a subscription from the JID.
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unsubscribe -- Unsubscribe from the JID.
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send_presence -- Send a directed presence to the JID.
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send_last_presence -- Resend the last sent presence.
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handle_available -- Update the JID's resource information.
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handle_unavailable -- Update the JID's resource information.
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handle_subscribe -- Handle a subscription request.
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handle_subscribed -- Handle a notice that a subscription request
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was authorized by the JID.
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handle_unsubscribe -- Handle an unsubscribe request.
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handle_unsubscribed -- Handle a notice that a subscription was
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removed by the JID.
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handle_probe -- Handle a presence probe query.
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"""
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def __init__(self, xmpp, jid, owner=None,
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state=None, db=None, roster=None):
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"""
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Create a new roster item.
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Arguments:
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xmpp -- The main SleekXMPP instance.
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jid -- The item's JID.
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owner -- The roster owner's JID. Defaults
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so self.xmpp.boundjid.bare.
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state -- A dictionary of initial state values.
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db -- An optional interface to an external datastore.
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roster -- The roster object containing this entry.
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"""
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self.xmpp = xmpp
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self.jid = jid
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self.owner = owner or self.xmpp.boundjid.bare
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self.last_status = None
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self.resources = {}
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self.roster = roster
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self.db = db
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self._state = state or {
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'from': False,
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'to': False,
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'pending_in': False,
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'pending_out': False,
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'whitelisted': False,
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'subscription': 'none',
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'name': '',
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'groups': []}
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self._db_state = {}
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self.load()
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def set_backend(self, db=None, save=True):
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"""
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Set the datastore interface object for the roster item.
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Arguments:
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db -- The new datastore interface.
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save -- If True, save the existing state to the new
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backend datastore. Defaults to True.
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"""
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self.db = db
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if save:
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self.save()
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self.load()
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def load(self):
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"""
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Load the item's state information from an external datastore,
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if one has been provided.
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"""
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if self.db:
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item = self.db.load(self.owner, self.jid,
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self._db_state)
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if item:
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self['name'] = item['name']
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self['groups'] = item['groups']
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self['from'] = item['from']
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self['to'] = item['to']
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self['whitelisted'] = item['whitelisted']
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self['pending_out'] = item['pending_out']
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self['pending_in'] = item['pending_in']
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self['subscription'] = self._subscription()
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return self._state
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return None
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def save(self, remove=False):
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"""
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Save the item's state information to an external datastore,
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if one has been provided.
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Arguments:
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remove -- If True, expunge the item from the datastore.
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"""
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self['subscription'] = self._subscription()
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if remove:
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self._state['removed'] = True
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if self.db:
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self.db.save(self.owner, self.jid,
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self._state, self._db_state)
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# Finally, remove the in-memory copy if needed.
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if remove:
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del self.xmpp.roster[self.owner][self.jid]
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def __getitem__(self, key):
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"""Return a state field's value."""
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if key in self._state:
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if key == 'subscription':
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return self._subscription()
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return self._state[key]
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else:
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raise KeyError
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def __setitem__(self, key, value):
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"""
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Set the value of a state field.
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For boolean states, the values True, 'true', '1', 'on',
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and 'yes' are accepted as True; all others are False.
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Arguments:
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key -- The state field to modify.
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value -- The new value of the state field.
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"""
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if key in self._state:
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if key in ['name', 'subscription', 'groups']:
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self._state[key] = value
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else:
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value = str(value).lower()
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self._state[key] = value in ('true', '1', 'on', 'yes')
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else:
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raise KeyError
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def _subscription(self):
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"""Return the proper subscription type based on current state."""
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if self['to'] and self['from']:
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return 'both'
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elif self['from']:
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return 'from'
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elif self['to']:
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return 'to'
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else:
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return 'none'
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def remove(self):
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"""
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Remove a JID's whitelisted status and unsubscribe if a
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subscription exists.
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"""
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if self['to']:
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p = self.xmpp.Presence()
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p['to'] = self.jid
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p['type'] = 'unsubscribe'
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if self.xmpp.is_component:
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p['from'] = self.owner
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p.send()
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self['to'] = False
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self['whitelisted'] = False
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self.save()
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def subscribe(self):
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"""Send a subscription request to the JID."""
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p = self.xmpp.Presence()
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p['to'] = self.jid
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p['type'] = 'subscribe'
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if self.xmpp.is_component:
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p['from'] = self.owner
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self['pending_out'] = True
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self.save()
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p.send()
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def authorize(self):
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"""Authorize a received subscription request from the JID."""
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self['from'] = True
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self['pending_in'] = False
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self.save()
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self._subscribed()
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self.send_last_presence()
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def unauthorize(self):
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"""Deny a received subscription request from the JID."""
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self['from'] = False
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self['pending_in'] = False
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self.save()
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self._unsubscribed()
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p = self.xmpp.Presence()
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p['to'] = self.jid
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p['type'] = 'unavailable'
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if self.xmpp.is_component:
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p['from'] = self.owner
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p.send()
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def _subscribed(self):
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"""Handle acknowledging a subscription."""
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p = self.xmpp.Presence()
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p['to'] = self.jid
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p['type'] = 'subscribed'
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if self.xmpp.is_component:
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p['from'] = self.owner
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p.send()
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def unsubscribe(self):
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"""Unsubscribe from the JID."""
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p = self.xmpp.Presence()
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p['to'] = self.jid
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p['type'] = 'unsubscribe'
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if self.xmpp.is_component:
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p['from'] = self.owner
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self.save()
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p.send()
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def _unsubscribed(self):
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"""Handle acknowledging an unsubscribe request."""
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p = self.xmpp.Presence()
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p['to'] = self.jid
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p['type'] = 'unsubscribed'
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if self.xmpp.is_component:
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p['from'] = self.owner
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p.send()
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def send_presence(self, ptype=None, pshow=None, pstatus=None,
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ppriority=None, pnick=None):
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"""
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Create, initialize, and send a Presence stanza.
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Arguments:
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pshow -- The presence's show value.
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pstatus -- The presence's status message.
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ppriority -- This connections' priority.
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ptype -- The type of presence, such as 'subscribe'.
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pnick -- Optional nickname of the presence's sender.
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"""
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p = self.xmpp.make_presence(pshow=pshow,
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pstatus=pstatus,
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ppriority=ppriority,
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ptype=ptype,
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pnick=pnick,
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pto=self.jid)
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if self.xmpp.is_component:
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p['from'] = self.owner
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if p['type'] in p.showtypes or \
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p['type'] in ['available', 'unavailable']:
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self.last_status = p
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p.send()
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if not self.xmpp.sentpresence:
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self.xmpp.event('sent_presence')
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self.xmpp.sentpresence = True
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def send_last_presence(self):
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if self.last_status is None:
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pres = self.roster.last_status
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if pres is None:
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self.send_presence()
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else:
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pres['to'] = self.jid
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if self.xmpp.is_component:
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pres['from'] = self.owner
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else:
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del pres['from']
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pres.send()
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else:
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self.last_status.send()
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def handle_available(self, presence):
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resource = presence['from'].resource
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data = {'status': presence['status'],
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'show': presence['show'],
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'priority': presence['priority']}
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if not self.resources:
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self.xmpp.event('got_online', presence)
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if resource not in self.resources:
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self.resources[resource] = {}
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old_status = self.resources[resource].get('status', '')
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old_show = self.resources[resource].get('show', None)
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self.resources[resource].update(data)
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if old_show != presence['show'] or old_status != presence['status']:
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self.xmpp.event('changed_status', presence)
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def handle_unavailable(self, presence):
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resource = presence['from'].resource
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if not self.resources:
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return
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if resource in self.resources:
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del self.resources[resource]
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self.xmpp.event('changed_status', presence)
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if not self.resources:
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self.xmpp.event('got_offline', presence)
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def handle_subscribe(self, presence):
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"""
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+------------------------------------------------------------------+
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| EXISTING STATE | DELIVER? | NEW STATE |
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+------------------------------------------------------------------+
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| "None" | yes | "None + Pending In" |
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| "None + Pending Out" | yes | "None + Pending Out/In" |
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| "None + Pending In" | no | no state change |
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| "None + Pending Out/In" | no | no state change |
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| "To" | yes | "To + Pending In" |
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| "To + Pending In" | no | no state change |
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| "From" | no * | no state change |
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| "From + Pending Out" | no * | no state change |
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| "Both" | no * | no state change |
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+------------------------------------------------------------------+
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"""
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if self.xmpp.is_component:
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if not self['from'] and not self['pending_in']:
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self['pending_in'] = True
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self.xmpp.event('roster_subscription_request', presence)
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elif self['from']:
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self._subscribed()
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self.save()
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else:
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#server shouldn't send an invalid subscription request
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self.xmpp.event('roster_subscription_request', presence)
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def handle_subscribed(self, presence):
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"""
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+------------------------------------------------------------------+
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| EXISTING STATE | DELIVER? | NEW STATE |
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+------------------------------------------------------------------+
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| "None" | no | no state change |
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| "None + Pending Out" | yes | "To" |
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| "None + Pending In" | no | no state change |
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| "None + Pending Out/In" | yes | "To + Pending In" |
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| "To" | no | no state change |
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| "To + Pending In" | no | no state change |
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| "From" | no | no state change |
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| "From + Pending Out" | yes | "Both" |
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| "Both" | no | no state change |
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+------------------------------------------------------------------+
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"""
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if self.xmpp.is_component:
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if not self['to'] and self['pending_out']:
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self['pending_out'] = False
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self['to'] = True
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self.xmpp.event('roster_subscription_authorized', presence)
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self.save()
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else:
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self.xmpp.event('roster_subscription_authorized', presence)
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def handle_unsubscribe(self, presence):
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"""
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+------------------------------------------------------------------+
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| EXISTING STATE | DELIVER? | NEW STATE |
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+------------------------------------------------------------------+
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| "None" | no | no state change |
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| "None + Pending Out" | no | no state change |
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| "None + Pending In" | yes * | "None" |
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| "None + Pending Out/In" | yes * | "None + Pending Out" |
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| "To" | no | no state change |
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| "To + Pending In" | yes * | "To" |
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| "From" | yes * | "None" |
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| "From + Pending Out" | yes * | "None + Pending Out |
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| "Both" | yes * | "To" |
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+------------------------------------------------------------------+
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"""
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if self.xmpp.is_component:
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if not self['from'] and self['pending_in']:
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self['pending_in'] = False
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self._unsubscribed()
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elif self['from']:
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self['from'] = False
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self._unsubscribed()
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self.xmpp.event('roster_subscription_remove', presence)
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self.save()
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else:
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self.xmpp.event('roster_subscription_remove', presence)
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def handle_unsubscribed(self, presence):
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"""
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+------------------------------------------------------------------+
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| EXISTING STATE | DELIVER? | NEW STATE |
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+------------------------------------------------------------------+
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| "None" | no | no state change |
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| "None + Pending Out" | yes | "None" |
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| "None + Pending In" | no | no state change |
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| "None + Pending Out/In" | yes | "None + Pending In" |
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| "To" | yes | "None" |
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| "To + Pending In" | yes | "None + Pending In" |
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| "From" | no | no state change |
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| "From + Pending Out" | yes | "From" |
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| "Both" | yes | "From" |
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+------------------------------------------------------------------
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"""
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if self.xmpp.is_component:
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if not self['to'] and self['pending_out']:
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self['pending_out'] = False
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elif self['to'] and not self['pending_out']:
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self['to'] = False
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self.xmpp.event('roster_subscription_removed', presence)
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self.save()
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else:
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self.xmpp.event('roster_subscription_removed', presence)
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def handle_probe(self, presence):
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if self['to']:
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self.send_last_presence()
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if self['pending_out']:
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self.subscribe()
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if not self['to']:
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self._unsubscribed()
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def reset(self):
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"""
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Forgot current resource presence information as part of
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a roster reset request.
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"""
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self.resources = {}
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def __repr__(self):
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return repr(self._state)
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