This file is indexed.

/usr/share/pyshared/sugar/presence/presenceservice.py is in python-sugar-toolkit-0.88 0.88.1-4.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
# Copyright (C) 2007, Red Hat, Inc.
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the
# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
# Boston, MA 02111-1307, USA.

"""UI class to access system-level presence object

STABLE.
"""

import logging
import traceback

import dbus
import dbus.exceptions
import dbus.glib
import gobject

from sugar.presence.buddy import Buddy
from sugar.presence.activity import Activity


DBUS_SERVICE = "org.laptop.Sugar.Presence"
DBUS_INTERFACE = "org.laptop.Sugar.Presence"
DBUS_PATH = "/org/laptop/Sugar/Presence"

_logger = logging.getLogger('sugar.presence.presenceservice')


class PresenceService(gobject.GObject):
    """UI-side interface to the dbus presence service

    This class provides UI programmers with simplified access
    to the dbus service of the same name.  It allows for observing
    various events from the presence service as GObject events,
    as well as some basic introspection queries.
    """
    __gsignals__ = {
        'buddy-appeared': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
                        ([gobject.TYPE_PYOBJECT])),
        'buddy-disappeared': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
                        ([gobject.TYPE_PYOBJECT])),
        # parameters: (activity: Activity, inviter: Buddy, message: unicode)
        'activity-invitation': (gobject.SIGNAL_RUN_FIRST, None, ([object]*3)),
        'private-invitation': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
                        ([gobject.TYPE_PYOBJECT, gobject.TYPE_PYOBJECT,
                          gobject.TYPE_PYOBJECT, str])),
        'activity-appeared': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
                        ([gobject.TYPE_PYOBJECT])),
        'activity-disappeared': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
                        ([gobject.TYPE_PYOBJECT])),
        'activity-shared': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
                        ([gobject.TYPE_PYOBJECT, gobject.TYPE_PYOBJECT,
                          gobject.TYPE_PYOBJECT])),
    }

    _PS_BUDDY_OP = DBUS_PATH + "/Buddies/"
    _PS_ACTIVITY_OP = DBUS_PATH + "/Activities/"

    def __init__(self, allow_offline_iface=True):
        """Initialise the service and attempt to connect to events
        """
        gobject.GObject.__init__(self)
        self._objcache = {}
        self._joined = None

        # Get a connection to the session bus
        self._bus = dbus.SessionBus()
        self._bus.add_signal_receiver(self._name_owner_changed_cb,
                                    signal_name="NameOwnerChanged",
                                    dbus_interface="org.freedesktop.DBus")

        # attempt to load the interface to the service...
        self._allow_offline_iface = allow_offline_iface
        self._get_ps()

    def _name_owner_changed_cb(self, name, old, new):
        if name != DBUS_SERVICE:
            return
        if (old and len(old)) and (not new and not len(new)):
            # PS went away, clear out PS dbus service wrapper
            self._ps_ = None
        elif (not old and not len(old)) and (new and len(new)):
            # PS started up
            self._get_ps()

    _ps_ = None

    def _get_ps(self):
        """Retrieve dbus interface to PresenceService

        Also registers for updates from various dbus events on the
        interface.

        If unable to retrieve the interface, we will temporarily
        return an _OfflineInterface object to allow the calling
        code to continue functioning as though it had accessed a
        real presence service.

        If successful, caches the presence service interface
        for use by other methods and returns that interface
        """
        if not self._ps_:
            try:
                # NOTE: We need to follow_name_owner_changes here
                #       because we can not connect to a signal unless
                #       we follow the changes or we start the service
                #       before we connect.  Starting the service here
                #       causes a major bottleneck during startup
                ps = dbus.Interface(
                    self._bus.get_object(DBUS_SERVICE,
                                         DBUS_PATH,
                                         follow_name_owner_changes=True),
                    DBUS_INTERFACE)
            except dbus.exceptions.DBusException, err:
                _logger.error(
                    """Failure retrieving %r interface from
                       the D-BUS service %r %r: %s""",
                    DBUS_INTERFACE, DBUS_SERVICE, DBUS_PATH, err)
                if self._allow_offline_iface:
                    return _OfflineInterface()
                raise RuntimeError('Failed to connect to the presence '
                    'service.')
            else:
                self._ps_ = ps
                ps.connect_to_signal('BuddyAppeared',
                                     self._buddy_appeared_cb)
                ps.connect_to_signal('BuddyDisappeared',
                                     self._buddy_disappeared_cb)
                ps.connect_to_signal('ActivityAppeared',
                                     self._activity_appeared_cb)
                ps.connect_to_signal('ActivityDisappeared',
                                     self._activity_disappeared_cb)
                ps.connect_to_signal('ActivityInvitation',
                                     self._activity_invitation_cb)
                ps.connect_to_signal('PrivateInvitation',
                                     self._private_invitation_cb)
        return self._ps_

    _ps = property(_get_ps, None, None,
        """DBUS interface to the PresenceService
           (services/presence/presenceservice)""")

    def _new_object(self, object_path):
        """Turn new object path into (cached) Buddy/Activity instance

        object_path -- full dbus path of the new object, must be
            prefixed with either of _PS_BUDDY_OP or _PS_ACTIVITY_OP

        Note that this method is called throughout the class whenever
        the representation of the object is required, it is not only
        called when the object is first discovered.  The point is to only have
        _one_ Python object for any D-Bus object represented by an object path,
        effectively wrapping the D-Bus object in a single Python GObject.

        returns presence Buddy or Activity representation
        """
        obj = None
        try:
            obj = self._objcache[object_path]
            _logger.debug('Reused proxy %r', obj)
        except KeyError:
            if object_path.startswith(self._PS_BUDDY_OP):
                obj = Buddy(self._bus, self._new_object,
                        self._del_object, object_path)
            elif object_path.startswith(self._PS_ACTIVITY_OP):
                obj = Activity(self._bus, self._new_object,
                        self._del_object, object_path)
                try:
                    # Pre-fill the activity's ID
                    activity_id = obj.props.id
                except dbus.exceptions.DBusException:
                    logging.debug('Cannot get the activity ID')
            else:
                raise RuntimeError("Unknown object type")
            self._objcache[object_path] = obj
            _logger.debug('Created proxy %r', obj)
        return obj

    def _have_object(self, object_path):
        return object_path in self._objcache.keys()

    def _del_object(self, object_path):
        """Fully remove an object from the object cache when
           it's no longer needed.
        """
        del self._objcache[object_path]

    def _emit_buddy_appeared_signal(self, object_path):
        """Emit GObject event with presence.buddy.Buddy object"""
        self.emit('buddy-appeared', self._new_object(object_path))
        return False

    def _buddy_appeared_cb(self, op):
        """Callback for dbus event (forwards to method to emit GObject
        event)"""
        gobject.idle_add(self._emit_buddy_appeared_signal, op)

    def _emit_buddy_disappeared_signal(self, object_path):
        """Emit GObject event with presence.buddy.Buddy object"""
        # Don't try to create a new object here if needed; it will probably
        # fail anyway because the object has already been destroyed in the PS
        if self._have_object(object_path):
            obj = self._objcache[object_path]
            self.emit('buddy-disappeared', obj)

            # We cannot maintain the object in the cache because that would
            # keep a lot of objects from being collected. That includes UI
            # objects due to signals using strong references.
            # If we want to cache some despite the memory usage increase,
            # we could use a LRU cache limited to some value.
            del self._objcache[object_path]
            obj.destroy()

        return False

    def _buddy_disappeared_cb(self, object_path):
        """Callback for dbus event (forwards to method to emit GObject
        event)"""
        gobject.idle_add(self._emit_buddy_disappeared_signal, object_path)

    def _emit_activity_invitation_signal(self, activity_path, buddy_path,
                                         message):
        """Emit GObject event with presence.activity.Activity object"""
        self.emit('activity-invitation', self._new_object(activity_path),
                  self._new_object(buddy_path), unicode(message))
        return False

    def _activity_invitation_cb(self, activity_path, buddy_path, message):
        """Callback for dbus event (forwards to method to emit GObject
        event)"""
        gobject.idle_add(self._emit_activity_invitation_signal, activity_path,
                         buddy_path, message)

    def _emit_private_invitation_signal(self, bus_name, connection,
                                        channel, chan_type):
        """Emit GObject event with bus_name, connection and channel"""
        self.emit('private-invitation', bus_name, connection,
                  channel, chan_type)
        return False

    def _private_invitation_cb(self, bus_name, connection, channel, chan_type):
        """Callback for dbus event (forwards to method to emit GObject
        event)"""
        gobject.idle_add(self._emit_private_invitation_signal, bus_name,
                connection, channel, chan_type)

    def _emit_activity_appeared_signal(self, object_path):
        """Emit GObject event with presence.activity.Activity object"""
        self.emit('activity-appeared', self._new_object(object_path))
        return False

    def _activity_appeared_cb(self, object_path):
        """Callback for dbus event (forwards to method to emit GObject
        event)"""
        gobject.idle_add(self._emit_activity_appeared_signal, object_path)

    def _emit_activity_disappeared_signal(self, object_path):
        """Emit GObject event with presence.activity.Activity object"""
        self.emit('activity-disappeared', self._new_object(object_path))
        return False

    def _activity_disappeared_cb(self, object_path):
        """Callback for dbus event (forwards to method to emit GObject
        event)"""
        gobject.idle_add(self._emit_activity_disappeared_signal, object_path)

    def get(self, object_path):
        """Return the Buddy or Activity object corresponding to the given
        D-Bus object path.
        """
        return self._new_object(object_path)

    def get_activities(self):
        """Retrieve set of all activities from service

        returns list of Activity objects for all object paths
            the service reports exist (using GetActivities)
        """
        try:
            resp = self._ps.GetActivities()
        except dbus.exceptions.DBusException:
            _logger.exception('Unable to retrieve activity list from '
                'presence service')
            return []
        else:
            acts = []
            for item in resp:
                acts.append(self._new_object(item))
            return acts

    def _get_activities_cb(self, reply_handler, resp):
        acts = []
        for item in resp:
            acts.append(self._new_object(item))

        reply_handler(acts)

    def _get_activities_error_cb(self, error_handler, e):
        if error_handler:
            error_handler(e)
        else:
            _logger.warn('Unable to retrieve activity-list from presence '
                'service: %s', e)

    def get_activities_async(self, reply_handler=None, error_handler=None):
        """Retrieve set of all activities from service asyncronously
        """

        if not reply_handler:
            logging.error('Function get_activities_async called without' \
                          'a reply handler. Can not run.')
            return

        self._ps.GetActivities(
             reply_handler=lambda resp: \
                    self._get_activities_cb(reply_handler, resp),
             error_handler=lambda e: \
                    self._get_activities_error_cb(error_handler, e))

    def get_activity(self, activity_id, warn_if_none=True):
        """Retrieve single Activity object for the given unique id

        activity_id -- unique ID for the activity

        returns single Activity object or None if the activity
            is not found using GetActivityById on the service
        """
        try:
            act_op = self._ps.GetActivityById(activity_id)
        except dbus.exceptions.DBusException, err:
            if warn_if_none:
                _logger.warn("Unable to retrieve activity handle for %r from "
                             "presence service: %s", activity_id, err)
            return None
        return self._new_object(act_op)

    def get_buddies(self):
        """Retrieve set of all buddies from service

        returns list of Buddy objects for all object paths
            the service reports exist (using GetBuddies)
        """
        try:
            resp = self._ps.GetBuddies()
        except dbus.exceptions.DBusException:
            _logger.exception('Unable to retrieve buddy-list from presence '
                'service')
            return []
        else:
            buddies = []
            for item in resp:
                buddies.append(self._new_object(item))
            return buddies

    def _get_buddies_cb(self, reply_handler, resp):
        buddies = []
        for item in resp:
            buddies.append(self._new_object(item))

        reply_handler(buddies)

    def _get_buddies_error_cb(self, error_handler, e):
        if error_handler:
            error_handler(e)
        else:
            _logger.warn('Unable to retrieve buddy-list from presence '
                'service: %s', e)

    def get_buddies_async(self, reply_handler=None, error_handler=None):
        """Retrieve set of all buddies from service asyncronously
        """

        if not reply_handler:
            logging.error('Function get_buddies_async called without' \
                          'a reply handler. Can not run.')
            return

        self._ps.GetBuddies(
             reply_handler=lambda resp: \
                    self._get_buddies_cb(reply_handler, resp),
             error_handler=lambda e: \
                    self._get_buddies_error_cb(error_handler, e))

    def get_buddy(self, key):
        """Retrieve single Buddy object for the given public key

        key -- buddy's public encryption key

        returns single Buddy object or None if the activity
            is not found using GetBuddyByPublicKey on the
            service
        """
        try:
            buddy_op = self._ps.GetBuddyByPublicKey(dbus.ByteArray(key))
        except dbus.exceptions.DBusException:
            _logger.exception('Unable to retrieve buddy handle for %r from '
                'presence service', key)
            return None
        return self._new_object(buddy_op)

    def get_buddy_by_telepathy_handle(self, tp_conn_name, tp_conn_path,
                                      handle):
        """Retrieve single Buddy object for the given public key

        :Parameters:
            `tp_conn_name` : str
                The well-known bus name of a Telepathy connection
            `tp_conn_path` : dbus.ObjectPath
                The object path of the Telepathy connection
            `handle` : int or long
                The handle of a Telepathy contact on that connection,
                of type HANDLE_TYPE_CONTACT. This may not be a
                channel-specific handle.
        :Returns: the Buddy object, or None if the buddy is not found
        """
        try:
            buddy_op = self._ps.GetBuddyByTelepathyHandle(tp_conn_name,
                                                          tp_conn_path,
                                                          handle)
        except dbus.exceptions.DBusException, err:
            _logger.warn('Unable to retrieve buddy handle for handle %u at '
                         'conn %s:%s from presence service: %s',
                         handle, tp_conn_name, tp_conn_path, err)
            return None
        return self._new_object(buddy_op)

    def get_owner(self):
        """Retrieves the laptop "owner" Buddy object."""
        try:
            owner_op = self._ps.GetOwner()
        except dbus.exceptions.DBusException:
            _logger.exception('Unable to retrieve local user/owner from '
                'presence service')
            raise RuntimeError("Could not get owner object.")
        return self._new_object(owner_op)

    def _share_activity_cb(self, activity, op):
        """Finish sharing the activity
        """
        # FIXME find a better way to shutup pylint
        psact = self._new_object(op)
        psact._joined = True
        _logger.debug('%r: Just shared, setting up tubes', activity)
        psact.set_up_tubes(reply_handler=lambda:
                            self.emit("activity-shared", True, psact, None),
                           error_handler=lambda e:
                            self._share_activity_error_cb(activity, e))

    def _share_activity_error_cb(self, activity, err):
        """Notify with GObject event of unsuccessful sharing of activity"""
        _logger.debug('Error sharing activity %s: %s', activity.get_id(),
            err)
        self.emit("activity-shared", False, None, err)

    def share_activity(self, activity, properties=None, private=True):
        """Ask presence service to ask the activity to share itself publicly.

        Uses the AdvertiseActivity method on the service to ask for the
        sharing of the given activity.  Arranges to emit activity-shared
        event with:

            (success, Activity, err)

        on success/failure.

        returns None
        """
        actid = activity.get_id()

        if properties is None:
            properties = {}

        # Ensure the activity is not already shared/joined
        for obj in self._objcache.values():
            if not isinstance(object, Activity):
                continue
            if obj.props.id == actid or obj.props.joined:
                raise RuntimeError("Activity %s is already shared." %
                                   actid)

        atype = activity.get_bundle_id()
        name = activity.props.title
        properties['private'] = bool(private)
        self._ps.ShareActivity(actid, atype, name, properties,
                reply_handler=lambda op: \
                    self._share_activity_cb(activity, op),
                error_handler=lambda e: \
                    self._share_activity_error_cb(activity, e))

    def get_preferred_connection(self):
        """Gets the preferred telepathy connection object that an activity
        should use when talking directly to telepathy

        returns the bus name and the object path of the Telepathy connection"""

        try:
            bus_name, object_path = self._ps.GetPreferredConnection()
        except dbus.exceptions.DBusException:
            logging.error(traceback.format_exc())
            return None

        return bus_name, object_path


class _OfflineInterface(object):
    """Offline-presence-service interface

    Used to mimic the behaviour of a real PresenceService sufficiently
    to avoid crashing client code that expects the given interface.

    XXX we could likely return a "MockOwner" object reasonably
    easily, but would it be worth it?
    """

    def raiseException(self, *args, **named):
        """Raise dbus.exceptions.DBusException"""
        raise dbus.exceptions.DBusException('PresenceService Interface not '
            'available')

    GetActivities = raiseException
    GetActivityById = raiseException
    GetBuddies = raiseException
    GetBuddyByPublicKey = raiseException
    GetOwner = raiseException
    GetPreferredConnection = raiseException

    def ShareActivity(self, actid, atype, name, properties, reply_handler,
        error_handler):
        """Pretend to share and fail..."""
        exc = IOError('Unable to share activity as PresenceService is not '
            'currently available')
        return error_handler(exc)


class _MockPresenceService(gobject.GObject):
    """Test fixture allowing testing of items that use PresenceService

    See PresenceService for usage and purpose
    """

    __gsignals__ = {
        'buddy-appeared': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
                        ([gobject.TYPE_PYOBJECT])),
        'buddy-disappeared': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
                        ([gobject.TYPE_PYOBJECT])),
        'activity-invitation': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
                        ([gobject.TYPE_PYOBJECT])),
        'private-invitation': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
                        ([gobject.TYPE_PYOBJECT, gobject.TYPE_PYOBJECT,
                          gobject.TYPE_PYOBJECT])),
        'activity-appeared': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
                        ([gobject.TYPE_PYOBJECT])),
        'activity-disappeared': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
                        ([gobject.TYPE_PYOBJECT])),
    }

    def __init__(self):
        gobject.GObject.__init__(self)

    def get_activities(self):
        return []

    def get_activity(self, activity_id):
        return None

    def get_buddies(self):
        return []

    def get_buddy(self, key):
        return None

    def get_owner(self):
        return None

    def share_activity(self, activity, properties=None):
        return None


_ps = None


def get_instance(allow_offline_iface=False):
    """Retrieve this process' view of the PresenceService"""
    global _ps
    if not _ps:
        _ps = PresenceService(allow_offline_iface)
    return _ps