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Steve Kille 2016-12-21 10:43:15 +00:00
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xep-0369.xml
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@ -187,7 +187,7 @@
<li>Online clients MAY register presence, which is then shared with participants who have subscribed to presence.</li>
<li>MIX decouples addressing of channel participants from their nicknames, so that nickname changes do not affect addressing.</li>
<li>Each participant is addressable by a single bare JID, which is a proxy JID (not the user's real JID) to make it straightforward to hide the user's real JID from other channel participants. Full JIDs comprised of this bare JID plus a resource (also anonymized) are then constructed, allowing visibility into the number of online resources participating in a channel.</li>
<li>MIX requires client support and server support from the server providing the MIX service. Although some protocol is shared with MUC, MUC clients are not interoperable with MIX servers. This means that where a user chooses to use MIX, all of the users clients need to support MIX.</li>
<li>MIX requires client support and server support from the server providing the MIX service. Although some protocol is shared with MUC, MUC clients are not interoperable with a MIX service. This means that where a user chooses to use MIX, all of the users clients need to support MIX.</li>
<li>MIX requires the server to which the MIX client connects to provide functionality to support MIX. This functionality is termed "MIX Proxy" and is defined in this specification.</li>
</ol>
</section2>
@ -207,7 +207,7 @@
</p>
<ol>
<li>Each MIX client will register with the MIX Proxy when it comes online. A key benefit of this approach is that MIX messages will only be sent to clients that support MIX. This enables use of clients that do not use MIX in conjunction with the MIX proxy.</li>
<li>MIX Service and Channel subscription and management is handled through the MIX proxy so that the MIX Proxy can track all subscription changes and share subscription information between MIX clients. To achieve this, a MIX client sends these MIX management queries to the MIX Proxy using the clients full JID and receives responses back from the MIX Proxy. The MIX Proxy will communicate these requests to a MIX channel from the MIX using the user's bare JID. Because the MIX Proxy is aware of subscription information, it can provide integrated support to a set of MIX clients.</li>
<li>MIX Service and Channel subscription and management is handled through the MIX proxy so that the MIX Proxy can track all subscription changes and share subscription information between MIX clients. To achieve this, a MIX client sends these MIX management queries to the MIX Proxy using the clients full JID in the from and receives responses back from the MIX Proxy. The MIX Proxy will communicate these requests to a MIX channel from the MIX using the user's bare JID. Because the MIX Proxy is aware of subscription information, it can provide integrated support to a set of MIX clients.</li>
<li>Messages from a MIX client to a MIX channel will go direct to the MIX service and not through the MIX Proxy.</li>
<li>Messages from a MIX channel to a MIX client MUST be handled by a MIX Proxy.</li>
<li>The MIX Proxy will only send messages to online clients and will discard messages if no clients are online.
@ -268,7 +268,7 @@
<tr><td>'Enforce Visible'</td><td>The users JID will always be shown and the user will be removed from channel if mode is changed to 'JID Hidden'.</td></tr>
</table>
<p>
The primary representation of a participant in a MIX channel is a proxy JID, which is an anonymized JID using the same domain as the channel and with the name of the channel encoded, using the format "&lt;channel&gt;+&lt;generated identifier&gt;@&lt;mix domain&gt;". They generated identifier MUST NOT contain the '+' characters. The Channel name MAY contain the '+' character. For example in the channel 'coven@mix.shakespeare.example', the user 'hag66@shakespeare.example' might have a proxy JID of 'coven+123456@mix.shakespeare.example'. The reason for the proxy JID is to support JID Hidden channels. Proxy JIDs are also used in JID Visible channels, for consistency and to enable switching of JID visibility. The "urn:xmpp:mix:nodes:jidmap" node maps from proxy JID to real JID. While a user is a participant in a Channel, the mapping between real JID and proxy JID MUST NOT be changed,
The primary representation of a participant in a MIX channel is a proxy JID, which is an anonymized JID using the same domain as the channel and with the name of the channel encoded, using the format "&lt;channel&gt;+&lt;generated identifier&gt;@&lt;mix domain&gt;". They generated identifier MUST NOT contain the '+' characters. The Channel name MAY contain the '+' character. For example in the channel 'coven@mix.shakespeare.example', the user 'hag66@shakespeare.example' might have a proxy JID of 'coven+123456@mix.shakespeare.example'. The reason for the proxy JID is to support JID Hidden channels. Proxy JIDs are also used in JID Visible channels, for consistency and to enable switching of JID visibility. The "urn:xmpp:mix:nodes:jidmap" node maps from proxy JID to real JID. While a user is a participant in a Channel, the mapping between real JID and proxy JID MUST NOT be changed.
</p>
<p>
The full JIDs held in the presence nodes are anonymized using a similar mechanism. First the bare JID is mapped to a bare proxy JID, using the mapping held in the "urn:xmpp:mix:nodes:jidmap" node for the bare JID. Then the resource is replaced with a generated value. For example, 'hag66@shakespeare.example' in the channel coven might have a proxy JID of 'coven+123456@mix.shakespeare.example/789'. There is no client visible mapping of proxy full JIDs maintained as this is not needed. The MIX channel will need to maintain a mapping, to support directly addressing clients, such as for client to client disco#info queries. While an anonymized JID is held in the presence node, the mapping to real JID MUST NOT be changed. When an anonoymized full JID is added to the presence node, mapping to a real full JID that was previously in the presence node, the same anonymized JID as the previous time MAY be used or a different anonymized JID MAY be used.
@ -454,7 +454,7 @@
</section3>
<section3 topic="Configuration Node" anchor="config-node">
<p>
The Configuration node holds the configuration of the channel as a single item, named by the date-time of the last update to the configuration. A single item is stored in the node, with previous configuration history accessed by MAM. Users with read access to the configuration node MAY subscribe to the configuration node to get notification of configuration change. This node is accessed and managed using standard pubsub. The configuration node is optional for a MIX channel. For example, configuration choices could be fixed and not exposed. A subset of the defined configuration options may be used and additional non-standard configuration options may be added. If configuration options to control functionality of the nature described here are provided, the options defined in this standard MUST be used. The following configuration attributes are defined:
The Configuration node holds the configuration of the channel as a single item, named by the date-time of the last update to the configuration. A single item is stored in the node, with previous configuration history accessed by MAM. Users with read access to the configuration node MAY subscribe to the configuration node to get notification of configuration change. This node is accessed and managed using standard pubsub. The configuration node is optional for a MIX channel. For example, configuration choices could be fixed and not exposed. A subset of the defined configuration options may be used and additional non-standard configuration options may be added. JIDs in the configuration MUST be real bare JIDs and not proxy JIDs. If configuration options to control functionality of the nature described here are provided, the options defined in this standard MUST be used. The following configuration attributes are defined:
</p>
<table caption="Configuration Node Attributes">
<tr><th>Name</th><th>Description</th><th>Field Type</th><th>Values</th><th>Default</th></tr>
@ -580,7 +580,7 @@
<p>A MIX service MUST NOT advertise support for &xep0313;, as MAM is supported by the channels and not by the service. A MIX service MUST NOT advertise support for generic &xep0060;, as although MIX makes use of PubSub it is not a generic PubSub service.</p>
</section2>
<section2 topic='Discovering the Channels on a Service' anchor='disco-channel-list'>
<p>The list of channels supported by a MIX service is obtained by a disco#items command. The MIX server MUST only return channel that exist and that the user making the query has rights to subscribe to. This query MAY be made directly by and XMPP client or by a MIX Proxy.</p>
<p>The list of channels supported by a MIX service is obtained by a disco#items command. The MIX service MUST only return channel that exist and that the user making the query has rights to subscribe to. This query MAY be made directly by and XMPP client or by a MIX Proxy.</p>
<example caption='MIX Proxy Queries for Channels on MIX Service'><![CDATA[
<iq from='hag66@shakespeare.lit'
id='kl2fax27'
@ -630,7 +630,7 @@
]]></example>
</section2>
<section2 topic='Discovering Nodes at a Channel' anchor='disco-channel-nodes'>
<p>Use disco#items to find the nodes associated with a channel. The MIX server MUST only return nodes that exist and that the user making the query has rights to subscribe to. This query MUST be made by a MIX Proxy and not the end client.</p>
<p>Use disco#items to find the nodes associated with a channel. The MIX service MUST only return nodes that exist and that the user making the query has rights to subscribe to. This query MUST be made by a MIX Proxy and not the end client.</p>
<example caption='Entity Queries for Nodes at a Channel'><![CDATA[
<iq from='hag66@shakespeare.lit'
id='kl2fax27'
@ -744,7 +744,7 @@
<section2 topic='Common User Use Cases' anchor='usecases-user'>
<section3 topic='Joining a Channel' anchor='usecase-user-join'>
<p>A user joins a channel by sending a MIX "join" command. There is no default set of nodes, so user MUST specify the set of nodes to be subscribed to. To achieve the equivalent service to MUC, a user would subscribe to messages, presence and subject.
This will lead to the server subscribing the user to each of the requested nodes associated with the channel. The MIX server will also add the user to the participant list by injecting a new item into the "urn:xmpp:mix:nodes:participants" node automatically.
This will lead to the server subscribing the user to each of the requested nodes associated with the channel. The MIX service will also add the user to the participant list by injecting a new item into the "urn:xmpp:mix:nodes:participants" node automatically.
</p>
<p>The default MIX model is that only channel participants may subscribe to nodes. A MIX channel MAY allow non-participant subscription. This will be handled by clients directly subscribing to the desired PubSub nodes.</p>
@ -864,7 +864,7 @@ the participant is not be subscribed to all nodes associated with the channel (i
</p>
<table caption="Standard User Preference Options">
<tr><th>Option</th> <th>Values</th><th>Default</th></tr>
<tr><td>'JID Visibility'</td> <td>'Default', 'Never', 'Prefer Not'</td> <td>'Use Channel Default'</td></tr>
<tr><td>'JID Visibility'</td> <td>'Default', 'Never', 'Prefer Not'</td> <td>'Default'</td></tr>
<tr><td>'Private Messages'</td><td>'Allow', 'Block'</td> <td>'Allow'</td></tr>
<tr><td>'vCard'</td><td>'Allow', 'Block'</td> <td>'Block'</td></tr>
<tr><td>'Presence'</td><td>'Share', 'Not Share'</td><td>'Share'</td></tr>
@ -1148,13 +1148,13 @@ the participant is not be subscribed to all nodes associated with the channel (i
A user may share presence information with the channel, for one or more online clients. Where a user shares presence information with a channel, the channel is entered by the user's server into the user's roster when the user subscribes to the channel. When an XMPP client comes online or changes presence status, this will be communicated by the user to the user's server using broadcast presence. The user's XMPP server is then responsible to share this presence information to each entry in the roster and in particular to each MIX channel in the roster. The MIX channel will update the "urn:xmpp:mix:nodes:presence" node with any change of status and the updated presence information and then share this updated presence with users subscribed to this node, as described below. When the user sets an explicit status, this is used to modify the presence node in the channel. When a client being used by the user goes offline, the associated server will send presence status "unavailable" to the MIX channel, which will cause the full JID for that client to be removed from the presence node.
</p>
<p>
A channel may require that all channel participants share presence information with the channel, which is represented in the "urn:xmpp:mix:nodes:presence" node. If sharing presences is required by the channel, an XMPP client conforming to this specification SHALL share presence with the channel by including the channel in the user's roster. Note that the MIX server cannot generally enforce this, but it can require and enforce that when a message is sent to the channel, that the sender of the message is in the presence list.
A channel may require that all channel participants share presence information with the channel, which is represented in the "urn:xmpp:mix:nodes:presence" node. If sharing presences is required by the channel, an XMPP client conforming to this specification SHALL share presence with the channel by including the channel in the user's roster. Note that the MIX service cannot generally enforce this, but it can require and enforce that when a message is sent to the channel, that the sender of the message is in the presence list.
</p>
<p>
Presence status and availability is set in a MIX channel by standard presence stanzas sent to the MIX channel by the user's server. User's wishing to receive presence updates will subscribe to the MIX channel presence node. Presence updates are sent out to subscribing using standard XEP-0045 compatible presence stanzas.
Presence status and availability is set in a MIX channel by standard presence stanzas sent to the MIX channel by the user's server. User's wishing to receive presence updates will subscribe to the MIX channel presence node. Presence updates are sent out to subscribing participants using standard presence stanzas.
</p>
<p>
A user setting status is now used as an example. Unlike in &xep0045; where coming online is a special action, coming online in MIX is implicit when presence status is set. Going offline is a achieved by setting presence status to unavailable, which removes the client full JID entry from the presence node. When a user sets a presence status, the user's server sends updated presence to the MIX channel, and the MIX server then publishes the user's availability to the "urn:xmpp:mix:nodes:presence" node. If there is not an item named by the full JID of the client with updated presence status, this item is created. If there is not an item named by the full JID of the client with updated presence status, then an item is created.</p>
A user setting status is now used as an example. Unlike in &xep0045; where coming online is a special action, coming online in MIX is implicit when presence status is set. Going offline is a achieved by setting presence status to unavailable, which removes the client full JID entry from the presence node. When a user sets a presence status, the user's server sends updated presence to the MIX channel, and the MIX service then publishes the user's availability to the "urn:xmpp:mix:nodes:presence" node. If there is not an item named by the full JID of the client with updated presence status, this item is created. If there is not an item named by the full JID of the client with updated presence status, then an item is created.</p>
<example caption="User Setting Presence Status">
<![CDATA[<presence xmlns='jabber:client' from=‘hag66@shakespeare.example/pda’ to='coven@mix.shakespeare.example'>
<show>dnd</show>
@ -1234,7 +1234,7 @@ the participant is not be subscribed to all nodes associated with the channel (i
type='unavailable'/>]]></example>
<p>
There is the possibility that the message associated with the user going offline will be lost. If this happens, "ghost" entries will appear in the presence node. A MIX server may take steps to address this, for example by probing client with a disco for presence items that remain unchanged for a long period.
There is the possibility that the message associated with the user going offline will be lost. If this happens, "ghost" entries will appear in the presence node. A MIX service may take steps to address this, for example by probing client with a disco for presence items that remain unchanged for a long period.
</p>
<p>
It is desirable to prevent clients from going offline briefly and then coming back online again, as this will lead to "flapping presence". The recommended approach to achieve this is use of &xep0198; to maintain an XMPP client connection in the event of short term TCP failure.
@ -1733,7 +1733,7 @@ A client creates a channel by sending a simple request to the MIX service. A c
<section3 topic='Destroying a Channel' anchor='usecase-admin-destroy'>
<p>
MIX channels are always explicitly destroyed by an owner of the channel or by a server operator. There is no concept of temporary channel, equivalent to &xep0045; temporary room which is automatically destroyed by the server when the users leave. However, channels MAY be configured with an explicit lifetime, after which the channel MUST be removed by the MIX server. Where a channel is created for ad hoc use, it may be desirable to keep the channel for history reference or for re-use by the same set of users. Note that the owner of the channel does not need to have presence registered in the channel in order to destroy it.
MIX channels are always explicitly destroyed by an owner of the channel or by a server operator. There is no concept of temporary channel, equivalent to &xep0045; temporary room which is automatically destroyed by the server when the users leave. However, channels MAY be configured with an explicit lifetime, after which the channel MUST be removed by the MIX service. Where a channel is created for ad hoc use, it may be desirable to keep the channel for history reference or for re-use by the same set of users. Note that the owner of the channel does not need to have presence registered in the channel in order to destroy it.
</p>
<p>
A client destroys a channel using a simple set operation, as shown in the following example.