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inbox: add ProtoXEP "Service Outage Status"
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mathieui
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inbox/service-outage-status.xml
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inbox/service-outage-status.xml
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<?xml version='1.0' encoding='UTF-8'?>
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<!DOCTYPE xep SYSTEM 'xep.dtd' [
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<!ENTITY % ents SYSTEM 'xep.ent'>
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%ents;
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]>
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<?xml-stylesheet type='text/xsl' href='xep.xsl'?>
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<xep>
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<header>
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<title>Service Outage Status</title>
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<abstract>This document defines an XMPP protocol extension that enables a server to communicate issues with the server to all users in a semantic manner.</abstract>
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&LEGALNOTICE;
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<number>xxxx</number>
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<status>ProtoXEP</status>
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<type>Standards Track</type>
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<sig>Standards</sig>
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<approver>Council</approver>
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<dependencies>
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<spec>XMPP Core</spec>
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<spec>XEP-0060</spec>
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<spec>XEP-0128</spec>
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<spec>XEP-0222</spec>
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</dependencies>
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<supersedes/>
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<supersededby/>
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<shortname>NOT_YET_ASSIGNED</shortname>
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<author>
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<firstname>Mathieu</firstname>
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<surname>Pasquet</surname>
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<email>mathieui@mathieui.net</email>
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<jid>mathieui@mathieui.net</jid>
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</author>
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<revision>
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<version>0.0.1</version>
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<date>2021-01-18</date>
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<initials>mp</initials>
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<remark><p>First draft.</p></remark>
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</revision>
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</header>
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<section1 topic='Introduction' anchor='intro'>
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<p>The XMPP Network is a network of servers which each have their own administration policies, status reports, and other peculiarities. &xep0157; provides a consistent framework for reaching out to administrators and reporting abuse, incidents, or even giving feedback on the service, and the goal of this specification is to provide a similar framework for letting users (or other entities) know the server status in-band or out of band (in case of hard failures).</p>
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<p>Centralized systems usually control both the infrastructure and client code, making it easy to hardcode information retrieval one way or the other.</p>
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<p>The usual way of informing users of planned maintenance, partial or total outage was previously through "announce" modules that lets the admin broadcast server-wided messages. This approach has several drawbacks, as it will appear in most clients as a new discussion with the server JID, which can prove confusing. It also does not provide a way to reach the user when the XMPP server is offline.</p>
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<p>This XEP provides:</p>
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<ul>
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<li>An informational way of exposing an external service endpoint containing machine-readable data using &xep0128;</li>
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<li>A specification of the data this service should provide</li>
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<li>A normative way of providing such information in-band, when the outage is not complete</li>
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<li>A way to reference and archive such incidents, in a &xep0060; node</li>
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</ul>
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</section1>
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<section1 topic='External endpoint discovery' anchor='external-disco'>
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<p>To make such discovery possible, we specify a &xep0128; mechanism that a server SHOULD return in response to service discovery information ("disco#info") requests sent to the bare domain of the server. This information MUST be scoped using a FORM_TYPE of "urn:xmpp:tmp:sos" (as already specified in <cite>XEP-0128</cite>) and data form fields registered for this purpose as defined in the <link url='#registrar'>XMPP Registrar Considerations</link> section of this document.</p>
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<p>Values of 'external-status-addresses' form field MUST be valid URIs, i.e. comply with the 'xs:anyURI' datatype of &w3xmlschema2;.</p>
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<example caption='Entity queries server for information'><![CDATA[
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<iq from='thirdwitch@shakespeare.lit/chamber'
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to='shakespeare.lit'
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id='disco1'
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type='get'>
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<query xmlns='http://jabber.org/protocol/disco#info'/>
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</iq>
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]]></example>
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<example caption='Server communicates information'><![CDATA[
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<iq from='shakespeare.lit'
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to='thirdwitch@shakespeare.list/chamber'
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id='disco1'
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type='result'>
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<query xmlns='http://jabber.org/protocol/disco#info'>
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<identity category='server' type='im'/>
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<feature var='http://jabber.org/protocol/disco'/>
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<x xmlns='jabber:x:data' type='result'>
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<field var='FORM_TYPE' type='hidden'>
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<value>urn:xmpp:tmp:sos</value>
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</field>
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<field var='external-status-addresses'>
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<value>http://secondary.shakespeare.lit/status.json</value>
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</field>
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</x>
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</query>
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</iq>
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]]></example>
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<p>Links present inside the 'external-status-addresses' field SHOULD use HTTP/HTTPS protocol and the resources referenced MUST be available without authentication.</p>
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</section1>
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<section1 topic='External status format' anchor='json-schema'>
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<p>TODO: do we want this to be XML or json? I have no real preference, in any case it should be preferably generated by a tool but easy to write by hand, as this needs to be usable in situations where time is the essence.</p>
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<p>The format used for the external status is defined here, to allow a wide range
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of compatibility across services and clients.</p>
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<p>A client MUST ignore unknown extra fields present in the JSON file, to allow extensibility, and implementations MAY add other fields.</p>
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<example caption='Example status'><![CDATA[
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{
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"outage": "complete",
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"planned": true,
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"beginning": "2021-01-12T01:01:01Z",
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"expected_end": "2021-01-12T05:00:00Z",
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"message": {
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"default": "Mise à jour du serveur",
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"en": "The serveur is being updated"
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}
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}
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]]></example>
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<p>The "message" field MUST contain at least a message on the "default" key, that will be
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used by the client if the current user language is not found. It is left to the
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operator to determine which language is more relevant as a default, according to the
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server’s user base.</p>
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<p>The following JSON schema is provided as a means to describe and validate the
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file exposed by the external service:</p>
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<code><![CDATA[
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{
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"$id": "http://xmpp.org/server-outage-schema.json",
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"$schema": "http://json-schema.org/draft-07/schema#",
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"title": "XMPP Server Outage Format",
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"type": "object",
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"required": ["beginning"],
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"additionalProperties": true,
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"properties": {
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"outage": {
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"type": "string",
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"enum": ["partial", "complete"],
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"description": "The outage status (partial or complete)."
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},
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"planned": {
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"type": "boolean",
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"description": "If the outage was planned or not."
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},
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"beginning": {
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"type": "string",
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"format": "date-time",
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"description": "Approximate time of the start of the outage."
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},
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"expected_end": {
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"type": "string",
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"format": "date-time",
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"description": "Estimated time of the end of the outage (if known)."
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},
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"message": {
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"type": "object",
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"description": "Textual message to service users, each key being 'defaul' or a BCP47 language tag.",
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"required": ["default"],
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"properties": {
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"default": { "type": "string"}
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},
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"patternProperties": {
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"default": {"type": "string"},
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".*": {"type": "string"}
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}
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}
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}
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}
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]]></code>
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</section1>
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<section1 topic="Pubsub Node" anchor="pubsubnode">
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<p>For in-band notifications of server issues, a service MUST expose a pubsub node with the acess model defined in &xep0222;.
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This pubsub node contains items describing outages, and each item MUST have an 'id' attribute value containing
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the publishing time, in &xep0082; format.</p>
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<p>Clients implementing this extension SHOULD subscribe to the '+notify' on that node, as defined in &xep0060;.</p>
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<p>Entities from other servers MAY be allowed to subscribe to other server nodes, to allow an external service
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to monitor the server. Doing so allows aggregation of XMPP outage events across the network, for a better
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transparency.</p>
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<example caption='Server operator publishes an outage event'><![CDATA[
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<iq from='firstwitch@shakespeare.lit/broom' to='shakespeare.lit' type='set' id='pub1'>
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<pubsub xmlns='http://jabber.org/protocol/pubsub'>
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<publish node='urn:xmpp:tmp:sos'>
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<item id="2021-01-01T01:01:01Z">
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<outage xmlns='urn:xmpp:tmp:sos'>
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<description xml:lang='en'>The ICQ and MSN gateways are down</description>
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<description xml:lang='fr'>Les passerelles ICQ et MSN sont mortes</description>
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<planned>false</planned>
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<expected_end>2021-01-01T05:00:00Z</expected_end>
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</outage>
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</item>
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</publish>
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</pubsub>
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</iq>
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]]></example>
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<example caption='Client subscribed receives an outage event'><![CDATA[
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<message from='shakespeare.lit'
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to='macbeth@shakespeare.lit/throne'
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type='headline'
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id='outagefoo'>
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<event xmlns='http://jabber.org/protocol/pubsub#event'>
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<items node='urn:xmpp:tmp:sos'>
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<item id="2021-01-01T01:01:01Z">
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<outage xmlns='urn:xmpp:tmp:sos'>
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<description xml:lang='en'>The ICQ and MSN gateways are down</description>
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<description xml:lang='fr'>Les passerelles ICQ et MSN sont mortes</description>
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<planned>false</planned>
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<expected_end>2021-01-01T05:00:00Z</expected_end>
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</outage>
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</item>
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</items>
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</event>
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</message>
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]]></example>
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<p>When the outage is over, servers operators SHOULD publish an <outage-end/> element
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with the item id matching the time at which the issue was resolved. It can optionally
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contain a description.</p>
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<example caption='Server operator publishes an end of outage event'><![CDATA[
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<iq from='firstwitch@shakespeare.lit/broom' to='shakespeare.lit' type='set' id='pub2'>
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<pubsub xmlns='http://jabber.org/protocol/pubsub'>
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<publish node='urn:xmpp:tmp:sos'>
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<item id="2021-01-01T02:05:01Z">
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<outage-end xmlns='urn:xmpp:tmp:sos'>
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<description xml:lang="en">Everything has been fixed!</description>
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<description xml:lang="fr">Tout a été corrigé !</description>
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</outage-end>
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</item>
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</publish>
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</pubsub>
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</iq>
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]]></example>
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<p>Clients receiving this notification SHOULD remove the information about the outage from the user’s view, and MAY
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display the new message briefly.</p>
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</section1>
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<section1 topic='Use Cases' anchor='usecases'>
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<p>This extension has been thought for several different cases of service outages:</p>
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<ul>
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<li>A client failing to connect to a server is able to display an informative message to the user if the server is having issues.</li>
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<li>A server experiencing difficulties is able to communicate it to the users, and clients can display the information prominently.</li>
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<li>An external service can keep track of the various outages, either for a single server or a number of them, and present the information in a structured manner.</li>
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</ul>
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</section1>
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<section1 topic='Business Rules' anchor='rules'>
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<p>A client implementing this extension MUST fetch the addresses of the external service and cache it
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for a reasonable amount of time (several days), to be able to use it when an issue occurs</p>
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</section1>
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<section1 topic='Internationalization Considerations' anchor='i18n'>
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<p>Both the JSON and the XML format defined in this document allow for internationalization in the fields that are expected to be presented to the user as-is. The other fields are machine-readable and their various values SHOULD be translated in the implementing applications.</p>
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</section1>
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<section1 topic='Security Considerations' anchor='security'>
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<p>Client implementations MUST check the provenance of the pubsub notifications before displaying a notification, otherwise malicious entities could send fake outage events.</p>
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</section1>
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<section1 topic='IANA Considerations' anchor='iana'>
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<p>This document requires no interaction with &IANA;.</p>
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</section1>
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<section1 topic='XMPP Registrar Considerations' anchor='registrar'>
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<p>The ®ISTRAR; includes the following information in its registries.</p>
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<section2 topic='Field Standardization' anchor='registrar-formtype'>
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<p>&xep0068; defines a process for standardizing the fields used within Data Forms qualified by a particular namespace, and <cite>XEP-0128</cite> describes how to use field standardization in the context of service discovery. This section registers fields for server information scoped by the "urn:xmpp:tmp:sos" FORM_TYPE.</p>
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<code caption='Registry Submission'><![CDATA[
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<form_type>
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<name>urn:xmpp:tmp:sos</name>
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<doc>XEP-XXXXX</doc>
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<desc>
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Form enabling a the registration of a machine-readable
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external file to describe a service status.
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</desc>
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<field
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var='external-status-addresses'
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type='list-multi'
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label='One or more addresses containing a file with the server status'/>
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</form_type>
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]]></code>
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</section2>
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</section1>
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<section1 topic='XML Schema' anchor='schema'>
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<p>REQUIRED for protocol specifications.</p>
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</section1>
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</xep>
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