path: root/services/presence/buddy.py

"""An "actor" on the network, whether remote or local"""
# Copyright (C) 2007, Red Hat, Inc.
# Copyright (C) 2007, Collabora Ltd.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

import os
import gobject
import dbus
import dbus.service
from dbus.gobject_service import ExportedGObject
import psutils

from sugar import env, profile
import logging

_BUDDY_PATH = "/org/laptop/Sugar/Presence/Buddies/"
_BUDDY_INTERFACE = "org.laptop.Sugar.Presence.Buddy"
_OWNER_INTERFACE = "org.laptop.Sugar.Presence.Buddy.Owner"

_PROP_NICK = "nick"
_PROP_KEY = "key"
_PROP_ICON = "icon"
_PROP_CURACT = "current-activity"
_PROP_COLOR = "color"
_PROP_OWNER = "owner"
_PROP_VALID = "valid"
_PROP_OBJID = 'objid'

# Will go away soon
_PROP_IP4_ADDRESS = "ip4-address"

_logger = logging.getLogger('s-p-s.buddy')


class Buddy(ExportedGObject):
    """Person on the network (tracks properties and shared activites)

    The Buddy is a collection of metadata describing a particular
    actor/person on the network.  The Buddy object tracks a set of
    activities which the actor has shared with the presence service.

    Buddies have a "valid" property which is used to flag Buddies
    which are no longer reachable.  That is, a Buddy may represent
    a no-longer reachable target on the network.

    The Buddy emits GObject events that the PresenceService uses
    to track changes in its status.

    Attributes:

        _activities -- dictionary mapping activity ID to
            activity.Activity objects
        handles -- dictionary mapping Telepathy client plugin to
            contact handle (an integer representing the JID or unique ID);
            channel-specific handles do not appear here
    """

    __gsignals__ = {
        'validity-changed':
            # The buddy's validity changed.
            # Validity starts off False, and becomes True when the buddy
            # has a color, a nick and a key.
            # * the new validity: bool
            (gobject.SIGNAL_RUN_FIRST, None, [bool]),
        'property-changed':
            # One of the buddy's properties has changed.
            # * those properties that have changed:
            #   dict { str => object }
            (gobject.SIGNAL_RUN_FIRST, None, [object]),
        'icon-changed':
            # The buddy's icon changed.
            # * the bytes of the icon: str
            (gobject.SIGNAL_RUN_FIRST, None, [object]),
        'disappeared':
            # The buddy is offline (has no Telepathy handles and is not the
            # Owner)
            (gobject.SIGNAL_RUN_FIRST, None, []),
    }

    __gproperties__ = {
        _PROP_KEY          : (str, None, None, None, gobject.PARAM_READWRITE),
        _PROP_ICON         : (object, None, None, gobject.PARAM_READWRITE),
        _PROP_NICK         : (str, None, None, None, gobject.PARAM_READWRITE),
        _PROP_COLOR        : (str, None, None, None, gobject.PARAM_READWRITE),
        _PROP_CURACT       : (str, None, None, None, gobject.PARAM_READWRITE),
        _PROP_VALID        : (bool, None, None, False, gobject.PARAM_READABLE),
        _PROP_OWNER        : (bool, None, None, False, gobject.PARAM_READABLE),
        _PROP_OBJID        : (str, None, None, None, gobject.PARAM_READABLE),
        _PROP_IP4_ADDRESS  : (str, None, None, None, gobject.PARAM_READWRITE)
    }

    def __init__(self, bus, object_id, **kwargs):
        """Initialize the Buddy object

        bus -- connection to the D-Bus session bus
        object_id -- the buddy's unique identifier, either based on their
            key-ID or JID
        kwargs -- used to initialize the object's properties

        constructs a DBUS "object path" from the _BUDDY_PATH
        and object_id
        """

        self._object_id = object_id
        self._object_path = dbus.ObjectPath(_BUDDY_PATH + object_id)

        self._activities = {}   # Activity ID -> Activity
        self._activity_sigids = {}
        self.handles = {} # tp client -> handle

        self._valid = False
        self._owner = False
        self._key = None
        self._icon = ''
        self._current_activity = None
        self._nick = None
        self._color = None
        self._ip4_address = None

        _ALLOWED_INIT_PROPS = [_PROP_NICK, _PROP_KEY, _PROP_ICON,
                               _PROP_CURACT, _PROP_COLOR, _PROP_IP4_ADDRESS]
        for (key, value) in kwargs.items():
            if key not in _ALLOWED_INIT_PROPS:
                _logger.debug("Invalid init property '%s'; ignoring..." % key)
                del kwargs[key]

        # Set icon after superclass init, because it sends DBus and GObject
        # signals when set
        icon_data = None
        if kwargs.has_key(_PROP_ICON):
            icon_data = kwargs[_PROP_ICON]
            del kwargs[_PROP_ICON]

        ExportedGObject.__init__(self, bus, self._object_path,
                                 gobject_properties=kwargs)

        if icon_data:
            self.props.icon = icon_data

    def do_get_property(self, pspec):
        """Retrieve current value for the given property specifier

        pspec -- property specifier with a "name" attribute
        """
        if pspec.name == _PROP_OBJID:
            return self._object_id
        elif pspec.name == _PROP_KEY:
            return self._key
        elif pspec.name == _PROP_ICON:
            return self._icon
        elif pspec.name == _PROP_NICK:
            return self._nick
        elif pspec.name == _PROP_COLOR:
            return self._color
        elif pspec.name == _PROP_CURACT:
            if not self._current_activity:
                return None
            if not self._activities.has_key(self._current_activity):
                return None
            return self._current_activity
        elif pspec.name == _PROP_VALID:
            return self._valid
        elif pspec.name == _PROP_OWNER:
            return self._owner
        elif pspec.name == _PROP_IP4_ADDRESS:
            return self._ip4_address

    def do_set_property(self, pspec, value):
        """Set given property

        pspec -- property specifier with a "name" attribute
        value -- value to set

        emits 'icon-changed' signal on icon setting
        calls _update_validity on all calls
        """
        if pspec.name == _PROP_ICON:
            if str(value) != self._icon:
                self._icon = str(value)
                self.IconChanged(self._icon)
                self.emit('icon-changed', self._icon)
        elif pspec.name == _PROP_NICK:
            self._nick = value
        elif pspec.name == _PROP_COLOR:
            self._color = value
        elif pspec.name == _PROP_CURACT:
            self._current_activity = value
        elif pspec.name == _PROP_KEY:
            if self._key:
                raise RuntimeError("Key already set.")
            self._key = value
        elif pspec.name == _PROP_IP4_ADDRESS:
            self._ip4_address = value

        self._update_validity()

    # dbus signals
    @dbus.service.signal(_BUDDY_INTERFACE,
                        signature="ay")
    def IconChanged(self, icon_data):
        """Generates DBUS signal with icon_data"""

    @dbus.service.signal(_BUDDY_INTERFACE,
                        signature="o")
    def JoinedActivity(self, activity_path):
        """Generates DBUS signal when buddy joins activity

        activity_path -- DBUS path to the activity object
        """

    @dbus.service.signal(_BUDDY_INTERFACE,
                        signature="o")
    def LeftActivity(self, activity_path):
        """Generates DBUS signal when buddy leaves activity

        activity_path -- DBUS path to the activity object
        """

    @dbus.service.signal(_BUDDY_INTERFACE,
                        signature="a{sv}")
    def PropertyChanged(self, updated):
        """Generates DBUS signal when buddy's property changes

        updated -- updated property-set (dictionary) with the
            Buddy's property (changed) values. Note: not the
            full set of properties, just the changes.
        """

    def add_telepathy_handle(self, tp_client, handle):
        """Add a Telepathy handle."""
        conn = tp_client.get_connection()
        self.TelepathyHandleAdded(conn.service_name, conn.object_path, handle)
        self.handles[tp_client] = handle

    @dbus.service.signal(_BUDDY_INTERFACE, signature='sou')
    def TelepathyHandleAdded(self, tp_conn_name, tp_conn_path, handle):
        """Another Telepathy handle has become associated with the buddy.

        This must only be emitted for non-channel-specific handles.

        tp_conn_name -- The bus name at which the Telepathy connection may be
            found
        tp_conn_path -- The object path at which the Telepathy connection may
            be found
        handle -- The handle of type CONTACT, which is not channel-specific,
            newly associated with the buddy
        """

    def remove_telepathy_handle(self, tp_client, handle):
        """Remove a Telepathy handle."""
        conn = tp_client.get_connection()
        my_handle = self.handles.get(tp_client, 0)
        if my_handle == handle:
            del self.handles[tp_client]
            self.TelepathyHandleRemoved(conn.service_name, conn.object_path,
                                        handle)
            # the Owner can't disappear - that would be silly
            if not self.handles and not self._owner:
                self.emit('disappeared')
        else:
            _logger.debug('Telepathy handle %u supposedly removed, but '
                          'my handle on that connection is %u - ignoring',
                          handle, my_handle)

    @dbus.service.signal(_BUDDY_INTERFACE, signature='sou')
    def TelepathyHandleRemoved(self, tp_conn_name, tp_conn_path, handle):
        """A Telepathy handle has ceased to be associated with the buddy,
        probably because that contact went offline.

        The parameters are the same as for TelepathyHandleAdded.
        """

    # dbus methods
    @dbus.service.method(_BUDDY_INTERFACE,
                        in_signature="", out_signature="ay")
    def GetIcon(self):
        """Retrieve Buddy's icon data

        returns empty string or dbus.ByteArray
        """
        if not self.props.icon:
            return ""
        return dbus.ByteArray(self.props.icon)

    @dbus.service.method(_BUDDY_INTERFACE,
                        in_signature="", out_signature="ao")
    def GetJoinedActivities(self):
        """Retrieve set of Buddy's joined activities (paths)

        returns list of dbus service paths for the Buddy's joined
            activities
        """
        acts = []
        for act in self.get_joined_activities():
            if act.props.valid:
                acts.append(act.object_path())
        return acts

    @dbus.service.method(_BUDDY_INTERFACE,
                        in_signature="", out_signature="a{sv}")
    def GetProperties(self):
        """Retrieve set of Buddy's properties

        returns dictionary of
            nick : str(nickname)
            owner : bool( whether this Buddy is an owner??? )
                XXX what is the owner flag for?
            key : str(public-key)
            color: Buddy's icon colour
                XXX what type?
            current-activity: Buddy's current activity_id, or
                "" if no current activity
        """
        props = {}
        props[_PROP_NICK] = self.props.nick
        props[_PROP_OWNER] = self.props.owner
        props[_PROP_KEY] = self.props.key
        props[_PROP_COLOR] = self.props.color

        if self.props.ip4_address:
            props[_PROP_IP4_ADDRESS] = self.props.ip4_address
        else:
            props[_PROP_IP4_ADDRESS] = ""

        if self.props.current_activity:
            props[_PROP_CURACT] = self.props.current_activity
        else:
            props[_PROP_CURACT] = ""
        return props

    @dbus.service.method(_BUDDY_INTERFACE,
                         in_signature='', out_signature='a(sou)')
    def GetTelepathyHandles(self):
        """Return a list of non-channel-specific Telepathy contact handles
        associated with this Buddy.

        :Returns:
            An array of triples (connection well-known bus name, connection
            object path, handle).
        """
        ret = []
        for plugin in self.handles:
            conn = plugin.get_connection()
            ret.append((str(conn.service_name), conn.object_path,
                        self.handles[plugin]))

    # methods
    def object_path(self):
        """Retrieve our dbus.ObjectPath object"""
        return dbus.ObjectPath(self._object_path)

    def _activity_validity_changed_cb(self, activity, valid):
        """Join or leave the activity when its validity changes"""
        if valid:
            self.JoinedActivity(activity.object_path())
        else:
            self.LeftActivity(activity.object_path())

    def add_activity(self, activity):
        """Add an activity to the Buddy's set of activities

        activity -- activity.Activity instance

        calls JoinedActivity
        """
        actid = activity.props.id
        if self._activities.has_key(actid):
            return
        self._activities[actid] = activity
        # join/leave activity when it's validity changes
        sigid = activity.connect("validity-changed",
                                 self._activity_validity_changed_cb)
        self._activity_sigids[actid] = sigid
        if activity.props.valid:
            self.JoinedActivity(activity.object_path())

    def remove_activity(self, activity):
        """Remove the activity from the Buddy's set of activities

        activity -- activity.Activity instance

        calls LeftActivity
        """
        actid = activity.props.id
        if not self._activities.has_key(actid):
            return
        activity.disconnect(self._activity_sigids[actid])
        del self._activity_sigids[actid]
        del self._activities[actid]
        if activity.props.valid:
            self.LeftActivity(activity.object_path())

    def get_joined_activities(self):
        """Retrieves list of still-valid activity objects"""
        acts = []
        for act in self._activities.values():
            acts.append(act)
        return acts

    def set_properties(self, properties):
        """Set the given set of properties on the object

        properties -- set of property values to set

        if no change, no events generated
        if change, generates property-changed and
            calls _update_validity
        """
        changed = False
        changed_props = {}
        if _PROP_NICK in properties:
            nick = properties[_PROP_NICK]
            if nick != self._nick:
                self._nick = nick
                changed_props[_PROP_NICK] = nick
                changed = True
        if _PROP_COLOR in properties:
            color = properties[_PROP_COLOR]
            if color != self._color:
                self._color = color
                changed_props[_PROP_COLOR] = color
                changed = True
        if _PROP_CURACT in properties:
            curact = properties[_PROP_CURACT]
            if curact != self._current_activity:
                self._current_activity = curact
                changed_props[_PROP_CURACT] = curact
                changed = True
        if _PROP_IP4_ADDRESS in properties:
            ip4addr = properties[_PROP_IP4_ADDRESS]
            if ip4addr != self._ip4_address:
                self._ip4_address = ip4addr
                changed_props[_PROP_IP4_ADDRESS] = ip4addr
                changed = True
        if _PROP_KEY in properties:
            # don't allow key to be set more than once
            if self._key is None:
                key = properties[_PROP_KEY]
                if key is not None:
                    self._key = key
                    changed_props[_PROP_KEY] = key
                    changed = True

        if not changed or not changed_props:
            return

        # Try emitting PropertyChanged before updating validity
        # to avoid leaking a PropertyChanged signal before the buddy is
        # actually valid the first time after creation
        if self._valid:
            dbus_changed = {}
            for key, value in changed_props.items():
                if value:
                    dbus_changed[key] = value
                else:
                    dbus_changed[key] = ""
            self.PropertyChanged(dbus_changed)

            self.emit('property-changed', changed_props)

        self._update_validity()

    def _update_validity(self):
        """Check whether we are now valid

        validity is True if color, nick and key are non-null

        emits validity-changed if we have changed validity
        """
        try:
            old_valid = self._valid
            if self._color and self._nick and self._key:
                self._valid = True
            else:
                self._valid = False

            if old_valid != self._valid:
                self.emit("validity-changed", self._valid)
        except AttributeError:
            self._valid = False


class GenericOwner(Buddy):
    """Common functionality for Local User-like objects

    The TestOwner wants to produce something *like* a
    ShellOwner, but with randomised changes and the like.
    This class provides the common features for a real
    local owner and a testing one.
    """
    __gtype_name__ = "GenericOwner"

    def __init__(self, ps, bus, object_id, **kwargs):
        """Initialize the GenericOwner instance

        ps -- presenceservice.PresenceService object
        bus -- a connection to the D-Bus session bus
        object_id -- the activity's unique identifier
        kwargs -- used to initialize the object's properties

        calls Buddy.__init__
        """
        self._ps = ps
        self._server = kwargs.pop("server", "olpc.collabora.co.uk")
        self._key_hash = kwargs.pop("key_hash", None)
        self._registered = kwargs.pop("registered", False)

        self._ip4_addr_monitor = psutils.IP4AddressMonitor.get_instance()
        self._ip4_addr_monitor.connect("address-changed",
                                       self._ip4_address_changed_cb)
        if self._ip4_addr_monitor.props.address:
            kwargs["ip4-address"] = self._ip4_addr_monitor.props.address

        Buddy.__init__(self, bus, object_id, **kwargs)
        self._owner = True

        self._bus = dbus.SessionBus()

    def _ip4_address_changed_cb(self, monitor, address):
        """Handle IPv4 address change, set property to generate event"""
        props = {_PROP_IP4_ADDRESS: address}
        self.set_properties(props)

    def get_registered(self):
        """Retrieve whether owner has registered with presence server"""
        return self._registered

    def get_server(self):
        """Retrieve XMPP server hostname (used by the server plugin)"""
        return self._server

    def get_key_hash(self):
        """Retrieve the user's private-key hash (used by the server plugin
        as a password)
        """
        return self._key_hash

    def set_registered(self, registered):
        """Customisation point: handle the registration of the owner"""
        raise RuntimeError("Subclasses must implement")


class ShellOwner(GenericOwner):
    """Representation of the local-machine owner using Sugar's Shell

    The ShellOwner uses the Sugar Shell's dbus services to
    register for updates about the user's profile description.
    """
    __gtype_name__ = "ShellOwner"

    _SHELL_SERVICE = "org.laptop.Shell"
    _SHELL_OWNER_INTERFACE = "org.laptop.Shell.Owner"
    _SHELL_PATH = "/org/laptop/Shell"

    def __init__(self, ps, bus):
        """Initialize the ShellOwner instance

        ps -- presenceservice.PresenceService object
        bus -- a connection to the D-Bus session bus

        Retrieves initial property values from the profile
        module.  Loads the buddy icon from file as well.
            XXX note: no error handling on that

        calls GenericOwner.__init__
        """
        server = profile.get_server()
        key_hash = profile.get_private_key_hash()
        registered = profile.get_server_registered()
        key = profile.get_pubkey()
        nick = profile.get_nick_name()
        color = profile.get_color().to_string()

        icon_file = os.path.join(env.get_profile_path(), "buddy-icon.jpg")
        f = open(icon_file, "r")
        icon = f.read()
        f.close()

        GenericOwner.__init__(self, ps, bus,
                'keyid/' + psutils.pubkey_to_keyid(key),
                key=key, nick=nick, color=color, icon=icon, server=server,
                key_hash=key_hash, registered=registered)

        # Ask to get notifications on Owner object property changes in the
        # shell. If it's not currently running, no problem - we'll get the
        # signals when it does run
        for (signal, cb) in (('IconChanged', self._icon_changed_cb),
                             ('ColorChanged', self._color_changed_cb),
                             ('NickChanged', self._nick_changed_cb)):
            self._bus.add_signal_receiver(cb, signal_name=signal,
                dbus_interface=self._SHELL_OWNER_INTERFACE,
                bus_name=self._SHELL_SERVICE,
                path=self._SHELL_PATH)

    def set_registered(self, value):
        """Handle notification that we have been registered"""
        if value:
            profile.set_server_registered()

    def _icon_changed_cb(self, icon):
        """Handle icon change, set property to generate event"""
        self.props.icon = icon

    def _color_changed_cb(self, color):
        """Handle color change, set property to generate event"""
        props = {_PROP_COLOR: color}
        self.set_properties(props)

    def _nick_changed_cb(self, nick):
        """Handle nickname change, set property to generate event"""
        props = {_PROP_NICK: nick}
        self.set_properties(props)

    def _cur_activity_changed_cb(self, activity_id):
        """Handle current-activity change, set property to generate event

        Filters out local activities (those not in self.activites)
        because the network users can't join those activities, so
        the activity_id shared will be None in those cases...
        """
        if not self._activities.has_key(activity_id):
            # This activity is local-only
            activity_id = None
        props = {_PROP_CURACT: activity_id}
        self.set_properties(props)