Popular electronic mail systems include features allowing users to set up automated messages that are returned to message senders when the user is not able to deal with the message immediately. This feature is commonly known as "out-of-office" or "vacation" messages, because it is most commonly used when a user is unable to read their messages because they are out of the office (e.g., on vacation).
This document describes a similar system that enables XMPP users to setup out-of-office messages when they are away.
The basis for the e-mail system mechanism is considering an incoming message at the server level and determining whether to respond with a canned out-of-office message. While a system may send a response for each incoming message, many systems provide an optimization where a response to subsequent e-mail messages is sent after some period of time expires.
The requirements for this feature are fairly straightforward. A user MUST be able to:
All these requirements are satisfied by Personal Eventing Protocol (XEP-0163) , which is a subset of Publish-Subscribe (XEP-0060) .
The out-of-office setting contains a start-time, an end-time and a short message text.
The start and end times are informational only; i.e., the server does nothing with these values other than store them. PEP does not include node lifetime management (i.e., start and end times for the node); therefore, the server is unable to enforce any start and end times included in the settings.
Using the PEP mechanism a client creates out-of-office settings on a PEP node with the desired access model (such as Presence or Open). When a user (or their client) sends presence containing CAPS (see Entity Capabilities (XEP-0115) ) with an entry for out-of-office to a contact with an out-of-office message, the user's client is notified of the out-of-office message and may display, in a client-defined fashion, the out-of-office settings information.
Clients may rely on the PEP node for notifications of changes as well as automatic notification when the user logs-in (i.e., a user is notified of the current item on the out-of-office PEP node of another user on sending initial presence).
A user may request their current out-of-office message by sending an IQ get to the local server like so:
The <start/> and <end/> elements define the times between which this vacation message should be considered valid by a supporting client; the times are in the format specified by XMPP Date and Time Profiles (XEP-0082) .
The <message/> element contains the text of the message which the client may display for the user (when appropriate).
If the user has no stored vacation message, the user will receive a result like the following:
A user may set new vacation message by publishing a new item with an id of 'current' to the out-of-office node:
And by design, PEP sends a notification to all the user's resources.
The meaning of each element is as outlined above. All elements are required.
Additionally, the <start/> and <end/> elements MAY be empty (i.e., have no CDATA). When <start/> is empty, the client MUST take this to mean that the settings should take effect immediately. Similarly, when <end/> is empty, the client MUST take this to mean that the settings should never expire (unless they are explicitly removed).
A user may remove all stored vacation settings by sending an IQ to the local server like so:
TODO: Is the Delete And Notify functionality described in XEP-0060 184.108.40.206 widely implemented? If so, should that case be included here?
In PEP, a node's default access model is 'presence' (i.e., any other user with a subscription type "from" or "both" may subscribe to the node. PEP provides other access models including a 'whitelist.' See Publish-Subscribe (XEP-0060)  section 4.5 for a list of Node Access Models.
The whitelist access model can be used to hide the current out-of-office message. With an empty whitelist, no other users receive notification when the node changes. The client may also use this fact to allow the client's user to set up an out-of-office message before it becomes active.
PEP and PubSub allow for publishing an item and setting configuration on a node. A user may wish to create an initial, hidden out-of-office setting. They may do so by publishing an item with id='archive' and an access model of 'whitelist.' When the user enables the out-of-office settings, a configuration changing the access model to some other mode sends notifications as defined by PEP.
TODO: add an example of publishing an item and setting configuration with a single stanza i.e., find the appropriate example from Publish-Subscribe (XEP-0060)  or Personal Eventing Protocol (XEP-0163)  and include it here.
A server implementing out-of-office messages MUST implement Personal Eventing Protocol (XEP-0163) .
None yet defined.
This document requires no interaction with the Internet Assigned Numbers Authority (IANA) .
The 'urn:xmpp:ooo:0' namespace shall be registered with the XMPP Registrar  as a result of this document.
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