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<?xml version="1.0" ?>
<node name="/Client_Approver"
xmlns:tp="http://telepathy.freedesktop.org/wiki/DbusSpec#extensions-v0">
<tp:copyright>Copyright (C) 2008 Collabora Ltd.</tp:copyright>
<tp:copyright>Copyright (C) 2008 Nokia Corporation</tp:copyright>
<tp:license xmlns="http://www.w3.org/1999/xhtml">
<p>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 2.1 of the License, or (at your option) any later version.</p>
<p>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.</p>
<p>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., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA.</p>
</tp:license>
<interface name="org.freedesktop.Telepathy.Client.Approver"
tp:causes-havoc="not yet final">
<tp:added version="0.17.12">(as a draft)</tp:added>
<tp:requires interface="org.freedesktop.Telepathy.Client"/>
<tp:docstring xmlns="http://www.w3.org/1999/xhtml">
<p>Approvers are clients that notify the user that new channels have
been created by a contact, and allow the user to accept or reject
those channels. The new channels are represented by a <tp:dbus-ref
namespace="org.freedesktop.Telepathy">ChannelDispatchOperation</tp:dbus-ref>
object, which is passed to the
<tp:member-ref>AddDispatchOperation</tp:member-ref> method.</p>
<tp:rationale>
<p>For instance, Empathy's tray icon, or the answer/reject window
seen when a Maemo device receives a VoIP call, should be
Approvers.</p>
</tp:rationale>
<p>Approvers can also select which channel handler will be used for the
channel, for instance by offering the user a list of possible
handlers rather than just an accept/reject choice.
However, the Channel Dispatcher must be able to prioritize
possible handlers on its own using some reasonable heuristic,
probably based on user configuration.</p>
<p>It is possible (and useful) to have an approver and
a channel handler in the same process; this is particularly useful
if a channel handler wants to claim responsibility for particular
channels itself.</p>
<p>All approvers are notified simultaneously. For instance, in a
desktop system, there might be one approver that displays a
notification-area icon, one that is part of a contact list
window and highlights contacts there, and one that is part
of a full-screen media player.</p>
<p>Any approver can approve the handling of a channel dispatch operation
with a particular channel handler by calling the <tp:dbus-ref
namespace="org.freedesktop.Telepathy.ChannelDispatchOperation">HandleWith</tp:dbus-ref>
method. Approvers can also attempt to <tp:dbus-ref
namespace="org.freedesktop.Telepathy.ChannelDispatchOperation">Claim</tp:dbus-ref>
channels; if this succeeds, the approver may handle the channels
itself (if it is also a Handler), or close the channels in order to
reject them.</p>
<p>At the D-Bus level, there is no "reject" operation: approvers wishing
to reject channels SHOULD call the Claim method, then (if it succeeds)
close the channels in any way they see fit.</p>
<p>The first approver to reply gets its decision acted on; any other
approvers that reply at approximately the same time will get a D-Bus
error, indicating that the channel has already been dealt with.</p>
<p>Approvers should usually prompt the user and ask for
confirmation, rather than dispatching the channel to a handler
straight away.</p>
</tp:docstring>
<property name="ApproverChannelFilter"
tp:name-for-bindings="Approver_Channel_Filter"
type="aa{sv}" access="read" tp:type="Channel_Class[]">
<tp:docstring xmlns="http://www.w3.org/1999/xhtml">
<p>A specification of the channels in which this approver is
interested. The <tp:member-ref>AddDispatchOperation</tp:member-ref>
method should be called by the channel dispatcher whenever at least
one of the channels in a channel dispatch operation matches this
description.</p>
<p>This property works in exactly the same way as the
<tp:dbus-ref namespace="org.freedesktop.Telepathy">Client.Observer.ObserverChannelFilter</tp:dbus-ref>
property. In particular, it cannot change while the approver process
continues to own the corresponding Client bus name.</p>
<p>In the .client file, it is represented in the
same way as ObserverChannelFilter, but the group has the same
name as this interface and the keys start with
ApproverChannelFilter instead of ObserverChannelFilter.</p>
</tp:docstring>
</property>
<method name="AddDispatchOperation"
tp:name-for-bindings="Add_Dispatch_Operation">
<tp:docstring xmlns="http://www.w3.org/1999/xhtml">
<p>Called by the channel dispatcher when a ChannelDispatchOperation
in which the approver has registered an interest is created,
or when the approver starts up while such channel dispatch
operations already exist.</p>
<p>The channel dispatcher SHOULD call this method on all approvers
at the same time. If an approver returns an error from this method,
the approver is assumed to be faulty.</p>
<p>If no approvers return from this method
successfully (including situations where there are no matching
approvers at all), the channel dispatcher SHOULD consider this
to be an error, and recover by dispatching the channel to the
most preferred handler.</p>
<tp:rationale>
Processes that aren't approvers (or don't at least ensure that there
is some approver) probably shouldn't be making connections
anyway, so there should always be at least one approver running.
</tp:rationale>
</tp:docstring>
<arg name="Channels" direction="in"
type="a(oa{sv})" tp:type="Channel_Details[]">
<tp:docstring xmlns="http://www.w3.org/1999/xhtml">
<p>The initial value of the <tp:dbus-ref
namespace="org.freedesktop.Telepathy">ChannelDispatchOperation.Channels</tp:dbus-ref>
property, containing the <tp:dbus-ref
namespace="org.freedesktop.Telepathy">Channel</tp:dbus-ref>s
to be dispatched and their properties.</p>
<tp:rationale>
<p>This can't be signalled to the approver through the Properties
parameter of this method, because Channels is not an immutable
property.</p>
</tp:rationale>
<p>This argument always contains all of the channels in the channel
dispatch operation, even if not all of them actually match
the <tp:member-ref>ApproverChannelFilter</tp:member-ref>.</p>
<tp:rationale>
<p>This seems the least bad way to handle such a situation;
see the discussion on
<a href="http://bugs.freedesktop.org/show_bug.cgi?id=21090">bug
#21090</a>.</p>
</tp:rationale>
<p>The actual channels to be dispatched may reduce as channels are
closed: this is signalled by <tp:dbus-ref
namespace="org.freedesktop.Telepathy">ChannelDispatchOperation.ChannelLost</tp:dbus-ref>.
</p>
<p>Approvers SHOULD connect to ChannelLost and <tp:dbus-ref
namespace="org.freedesktop.Telepathy">ChannelDispatchOperation.Finished</tp:dbus-ref>.
(if desired) before returning from AddDispatchOperation, since
those signals are guaranteed not to be emitted until after all
AddDispatchOperation calls have returned (with success or failure)
or timed out.</p>
</tp:docstring>
</arg>
<arg name="DispatchOperation" type="o" direction="in">
<tp:docstring xmlns="http://www.w3.org/1999/xhtml">
<p>The
<tp:dbus-ref namespace="org.freedesktop.Telepathy">ChannelDispatchOperation</tp:dbus-ref>
to be processed.</p>
</tp:docstring>
</arg>
<arg name="Properties" type="a{sv}"
tp:type="Qualified_Property_Value_Map" direction="in">
<tp:docstring>
<p>Properties of the channel dispatch operation. This MUST NOT
include properties that could change, SHOULD include as many
properties as possible given that constraint, and MUST include at
least the <tp:dbus-ref
namespace="org.freedesktop.Telepathy.ChannelDispatchOperation">Account</tp:dbus-ref>,
<tp:dbus-ref
namespace="org.freedesktop.Telepathy.ChannelDispatchOperation">Connection</tp:dbus-ref>
and <tp:dbus-ref
namespace="org.freedesktop.Telepathy.ChannelDispatchOperation">PossibleHandlers</tp:dbus-ref>
properties.</p>
</tp:docstring>
</arg>
</method>
</interface>
</node>
<!-- vim:set sw=2 sts=2 et ft=xml: -->
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