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317 lines
12 KiB
XML
317 lines
12 KiB
XML
<?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>Jabber-RPC</title>
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<abstract>This specification defines a method for transporting XML-RPC encoded requests and responses over Jabber/XMPP.</abstract>
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&LEGALNOTICE;
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<number>0009</number>
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<status>Final</status>
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<type>Standards Track</type>
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<sig>Standards</sig>
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<dependencies>
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<spec>XMPP Core</spec>
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<spec>XML-RPC</spec>
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</dependencies>
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<supersedes/>
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<supersededby/>
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<shortname>jabber-rpc</shortname>
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<schemaloc>
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<url>http://www.xmpp.org/schemas/jabber-rpc.xsd</url>
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</schemaloc>
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<author>
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<firstname>DJ</firstname>
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<surname>Adams</surname>
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<email>dj.adams@pobox.com</email>
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<jid>dj@gnu.mine.nu</jid>
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</author>
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<revision>
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<version>2.1</version>
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<date>2006-02-09</date>
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<initials>psa</initials>
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<remark>Defined error handling, service discovery, security considerations, and XMPP Registrar considerations.</remark>
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</revision>
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<revision>
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<version>2.0</version>
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<date>2002-12-09</date>
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<initials>psa</initials>
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<remark>Per a vote of the Jabber Council, changed status to Final.</remark>
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</revision>
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<revision>
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<version>1.0</version>
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<date>2001-09-27</date>
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<initials>psa</initials>
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<remark>Changed status to Draft</remark>
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</revision>
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<revision>
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<version>0.1</version>
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<date>2001-09-14</date>
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<initials>dja</initials>
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<remark>Initial version</remark>
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</revision>
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</header>
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<section1 topic='Introduction'>
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<p>&xmlrpc; is a method of encoding RPC requests and responses in XML. The original specification defines HTTP (see &rfc2068;) as the only valid transport for XML-RPC payloads.</p>
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<p>Various initiatives exist already to transport XML-RPC payloads over Jabber. These initiatives were independent of each other and used slightly differing methods (e.g. carrying the payload in a <message/> element as opposed to an &IQ; stanza), resulting in potential interoperability problems.</p>
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<p>A working session during JabberCon 2001 resulted in a <link url="http://www.pipetree.com/jabber/jrpc.html">formalisation</link> of a single method. This document describes that method, which is labelled as Jabber-RPC to differentiate it from XML-RPC itself.</p>
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</section1>
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<section1 topic='Jabber-RPC'>
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<p>The &IQ; stanza is used to transport XML-RPC payloads. XML-RPC requests are transported using an &IQ; stanza of type "set", and XML-RPC responses are transported using an &IQ; stanza of type "result". An &IQ; stanza MUST NOT contain more than one request or response.</p>
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<p>The &IQ; stanza contains a single &QUERY; sub-element in the jabber:iq:rpc namespace. The direct child of the &QUERY; element will be either a single <methodCall/> element (in the case of a request) or a single <methodResponse/> element (in the case of a response). This child element will contain the XML-RPC payload. Note that the XML declaration that normally appears at the head of an XML-RPC request or response when transported as the payload of an HTTP POST request MUST BE omitted when it is transported via a Jabber &IQ; stanza.</p>
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<p>The encoding of the Jabber XML stream is UTF-8. It is assumed that the encoding of the XML-RPC payload is also UTF-8.</p>
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<p>Application-level errors will be indicated within the XML-RPC payload (as is the case with the traditional HTTP-based XML-RPC mechanism). Transport level errors will be indicated in the normal way for &IQ; stanzas -- namely, by an &IQ; stanza of type "error" and the addition of an <error/> tag as a direct child of the &IQ; stanza. There are no specific XML-RPC-related, transport-level errors.</p>
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</section1>
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<section1 topic='Examples'>
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<example caption='A typical request'><![CDATA[
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<iq type='set'
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from='requester@company-b.com/jrpc-client'
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to='responder@company-a.com/jrpc-server'
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id='rpc1'>
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<query xmlns='jabber:iq:rpc'>
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<methodCall>
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<methodName>examples.getStateName</methodName>
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<params>
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<param>
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<value><i4>6</i4></value>
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</param>
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</params>
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</methodCall>
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</query>
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</iq>
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]]></example>
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<example caption='A typical response'><![CDATA[
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<iq type='result'
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from='responder@company-a.com/jrpc-server'
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to='requester@company-b.com/jrpc-client'
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id='rpc1'>
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<query xmlns='jabber:iq:rpc'>
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<methodResponse>
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<params>
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<param>
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<value><string>Colorado</string></value>
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</param>
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</params>
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</methodResponse>
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</query>
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</iq>
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]]></example>
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<p>If the requesting entity does not have sufficient permissions to perform remote procedure calls, the responding entity MUST return a &forbidden; error:</p>
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<example caption='Requesting entity is forbidden to perform remote procedure calls'><![CDATA[
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<iq type='error'
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from='responder@company-a.com/jrpc-server'
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to='requester@company-b.com/jrpc-client'
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id='rpc1'>
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<query xmlns='jabber:iq:rpc'>
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<methodCall>
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<methodName>examples.getStateName</methodName>
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<params>
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<param>
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<value><i4>6</i4></value>
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</param>
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</params>
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</methodCall>
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</query>
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<error code='403' type='auth'>
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<forbidden xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'/>
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</error>
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</iq>
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]]></example>
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</section1>
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<section1 topic='Service Discovery' anchor='disco'>
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<p>If an entity supports the Jabber-RPC protocol, it SHOULD advertise that fact in response to &xep0030; information ("diso#info") requests by returning an identity of "automation/rpc" and a feature of "jabber:iq:rpc":</p>
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<example caption='A disco#info query'><![CDATA[
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<iq type='get'
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from='requester@company-b.com/jrpc-client'
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to='responder@company-a.com/jrpc-server'
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id='disco1'>
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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='A disco#info response'><![CDATA[
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<iq type='result'
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to='requester@company-b.com/jrpc-client'
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from='responder@company-a.com/jrpc-server'
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id='disco1'>
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<query xmlns='http://jabber.org/protocol/disco#info'>
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<identity category='automation' type='rpc'/>
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<feature var='jabber:iq:rpc'/>
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</query>
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</iq>
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]]></example>
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</section1>
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<section1 topic='Security Considerations' anchor='security'>
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<p>An entity that supports Jabber-RPC SHOULD establish a "whitelist" of entities that are allowed to perform remote procedure calls and MUST return a &forbidden; error if entities with insufficient permissions attempt such calls.</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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<section2 topic='Protocol Namespaces' anchor='registrar-ns'>
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<p>The ®ISTRAR; includes 'jabber:iq:rpc' in its registry of protocol namespaces.</p>
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</section2>
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<section2 topic='Service Discovery Identity' anchor='registrar-disco'>
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<p>The XMPP Registrar includes a Service Discovery type of "rpc" within the "automation" category in its registry of service discovery identities.</p>
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</section2>
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</section1>
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<section1 topic='XML Schema'>
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<code><![CDATA[
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<?xml version='1.0' encoding='UTF-8'?>
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<xs:schema
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xmlns:xs='http://www.w3.org/2001/XMLSchema'
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targetNamespace='jabber:iq:rpc'
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xmlns='jabber:iq:rpc'
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elementFormDefault='qualified'>
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<xs:annotation>
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<xs:documentation>
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The protocol documented by this schema is defined in
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XEP-0009: http://www.xmpp.org/extensions/xep-0009.html
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There is no official XML schema for XML-RPC. The main body
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of this schema has been borrowed from an unofficial schema
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representation contained in the book "Processing XML With
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Java" by Elliotte Rusty Harold, as located at:
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http://www.ibiblio.org/xml/books/xmljava/chapters/ch02s05.html
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</xs:documentation>
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</xs:annotation>
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<xs:element name='query'>
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<xs:complexType>
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<xs:choice minOccurs='0' maxOccurs='1'>
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<xs:element ref='methodCall'/>
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<xs:element ref='methodResponse'/>
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</xs:choice>
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</xs:complexType>
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</xs:element>
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<xs:element name="methodCall">
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<xs:complexType>
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<xs:all>
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<xs:element name="methodName">
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<xs:simpleType>
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<xs:restriction base="ASCIIString">
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<xs:pattern value="([A-Za-z0-9]|/|\.|:|_)*" />
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</xs:restriction>
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</xs:simpleType>
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</xs:element>
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<xs:element name="params" minOccurs="0" maxOccurs="1">
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<xs:complexType>
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<xs:sequence>
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<xs:element name="param" type="ParamType"
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minOccurs="0" maxOccurs="unbounded"/>
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</xs:sequence>
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</xs:complexType>
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</xs:element>
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</xs:all>
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</xs:complexType>
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</xs:element>
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<xs:element name="methodResponse">
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<xs:complexType>
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<xs:choice>
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<xs:element name="params">
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<xs:complexType>
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<xs:sequence>
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<xs:element name="param" type="ParamType"/>
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</xs:sequence>
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</xs:complexType>
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</xs:element>
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<xs:element name="fault">
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<!-- What can appear inside a fault is very restricted -->
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<xs:complexType>
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<xs:sequence>
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<xs:element name="value">
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<xs:complexType>
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<xs:sequence>
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<xs:element name="struct">
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<xs:complexType>
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<xs:sequence>
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<xs:element name="member"
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type="MemberType">
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</xs:element>
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<xs:element name="member"
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type="MemberType">
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</xs:element>
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</xs:sequence>
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</xs:complexType>
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</xs:element>
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</xs:sequence>
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</xs:complexType>
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</xs:element>
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</xs:sequence>
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</xs:complexType>
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</xs:element>
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</xs:choice>
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</xs:complexType>
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</xs:element>
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<xs:complexType name="ParamType">
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<xs:sequence>
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<xs:element name="value" type="ValueType"/>
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</xs:sequence>
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</xs:complexType>
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<xs:complexType name="ValueType" mixed="true">
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<xs:choice>
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<xs:element name="i4" type="xs:int"/>
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<xs:element name="int" type="xs:int"/>
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<xs:element name="string" type="ASCIIString"/>
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<xs:element name="double" type="xs:decimal"/>
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<xs:element name="Base64" type="xs:base64Binary"/>
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<xs:element name="boolean" type="NumericBoolean"/>
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<xs:element name="dateTime.iso8601" type="xs:dateTime"/>
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<xs:element name="array" type="ArrayType"/>
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<xs:element name="struct" type="StructType"/>
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</xs:choice>
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</xs:complexType>
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<xs:complexType name="StructType">
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<xs:sequence>
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<xs:element name="member" type="MemberType"
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maxOccurs="unbounded"/>
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</xs:sequence>
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</xs:complexType>
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<xs:complexType name="MemberType">
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<xs:sequence>
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<xs:element name="name" type="xs:string" />
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<xs:element name="value" type="ValueType"/>
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</xs:sequence>
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</xs:complexType>
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<xs:complexType name="ArrayType">
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<xs:sequence>
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<xs:element name="data">
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<xs:complexType>
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<xs:sequence>
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<xs:element name="value" type="ValueType"
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minOccurs="0" maxOccurs="unbounded"/>
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</xs:sequence>
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</xs:complexType>
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</xs:element>
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</xs:sequence>
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</xs:complexType>
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<xs:simpleType name="ASCIIString">
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<xs:restriction base="xs:string">
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<xs:pattern value="([ -~]|\n|\r|\t)*" />
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</xs:restriction>
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</xs:simpleType>
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<xs:simpleType name="NumericBoolean">
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<xs:restriction base="xs:boolean">
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<xs:pattern value="0|1" />
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</xs:restriction>
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</xs:simpleType>
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</xs:schema>
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]]></code>
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</section1>
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</xep>
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