mirror of
https://github.com/moparisthebest/xeps
synced 2024-11-27 19:52:18 -05:00
6e921e3d88
git-svn-id: file:///home/ksmith/gitmigration/svn/xmpp/trunk@3420 4b5297f7-1745-476d-ba37-a9c6900126ab
317 lines
12 KiB
XML
317 lines
12 KiB
XML
<?xml version='1.0' encoding='UTF-8'?>
|
|
<!DOCTYPE xep SYSTEM 'xep.dtd' [
|
|
<!ENTITY % ents SYSTEM 'xep.ent'>
|
|
%ents;
|
|
]>
|
|
<?xml-stylesheet type='text/xsl' href='xep.xsl'?>
|
|
<xep>
|
|
<header>
|
|
<title>Jabber-RPC</title>
|
|
<abstract>This specification defines an XMPP protocol extension for transporting XML-RPC encoded requests and responses between two XMPP entities. The protocol supports all syntax and semantics of XML-RPC except that it uses XMPP instead of HTTP as the underlying transport.</abstract>
|
|
&LEGALNOTICE;
|
|
<number>0009</number>
|
|
<status>Final</status>
|
|
<type>Standards Track</type>
|
|
<sig>Standards</sig>
|
|
<dependencies>
|
|
<spec>XMPP Core</spec>
|
|
<spec>XML-RPC</spec>
|
|
</dependencies>
|
|
<supersedes/>
|
|
<supersededby/>
|
|
<shortname>jabber-rpc</shortname>
|
|
<schemaloc>
|
|
<url>http://www.xmpp.org/schemas/jabber-rpc.xsd</url>
|
|
</schemaloc>
|
|
<author>
|
|
<firstname>DJ</firstname>
|
|
<surname>Adams</surname>
|
|
<email>dj.adams@pobox.com</email>
|
|
<jid>dj@gnu.mine.nu</jid>
|
|
</author>
|
|
<revision>
|
|
<version>2.1</version>
|
|
<date>2006-02-09</date>
|
|
<initials>psa</initials>
|
|
<remark>Defined error handling, service discovery, security considerations, and XMPP Registrar considerations.</remark>
|
|
</revision>
|
|
<revision>
|
|
<version>2.0</version>
|
|
<date>2002-12-09</date>
|
|
<initials>psa</initials>
|
|
<remark>Per a vote of the Jabber Council, changed status to Final.</remark>
|
|
</revision>
|
|
<revision>
|
|
<version>1.0</version>
|
|
<date>2001-09-27</date>
|
|
<initials>psa</initials>
|
|
<remark>Changed status to Draft</remark>
|
|
</revision>
|
|
<revision>
|
|
<version>0.1</version>
|
|
<date>2001-09-14</date>
|
|
<initials>dja</initials>
|
|
<remark>Initial version</remark>
|
|
</revision>
|
|
</header>
|
|
<section1 topic='Introduction'>
|
|
<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>
|
|
<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>
|
|
<p>A working session during JabberCon 2001 resulted in formalisation of a single method. This document describes that method, which is labelled as Jabber-RPC to differentiate it from XML-RPC itself.</p>
|
|
</section1>
|
|
<section1 topic='Jabber-RPC'>
|
|
<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>
|
|
<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>
|
|
<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>
|
|
<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>
|
|
</section1>
|
|
<section1 topic='Examples'>
|
|
<example caption='A typical request'><![CDATA[
|
|
<iq type='set'
|
|
from='requester@company-b.com/jrpc-client'
|
|
to='responder@company-a.com/jrpc-server'
|
|
id='rpc1'>
|
|
<query xmlns='jabber:iq:rpc'>
|
|
<methodCall>
|
|
<methodName>examples.getStateName</methodName>
|
|
<params>
|
|
<param>
|
|
<value><i4>6</i4></value>
|
|
</param>
|
|
</params>
|
|
</methodCall>
|
|
</query>
|
|
</iq>
|
|
]]></example>
|
|
<example caption='A typical response'><![CDATA[
|
|
<iq type='result'
|
|
from='responder@company-a.com/jrpc-server'
|
|
to='requester@company-b.com/jrpc-client'
|
|
id='rpc1'>
|
|
<query xmlns='jabber:iq:rpc'>
|
|
<methodResponse>
|
|
<params>
|
|
<param>
|
|
<value><string>Colorado</string></value>
|
|
</param>
|
|
</params>
|
|
</methodResponse>
|
|
</query>
|
|
</iq>
|
|
]]></example>
|
|
<p>If the requesting entity does not have sufficient permissions to perform remote procedure calls, the responding entity MUST return a &forbidden; error:</p>
|
|
<example caption='Requesting entity is forbidden to perform remote procedure calls'><![CDATA[
|
|
<iq type='error'
|
|
from='responder@company-a.com/jrpc-server'
|
|
to='requester@company-b.com/jrpc-client'
|
|
id='rpc1'>
|
|
<query xmlns='jabber:iq:rpc'>
|
|
<methodCall>
|
|
<methodName>examples.getStateName</methodName>
|
|
<params>
|
|
<param>
|
|
<value><i4>6</i4></value>
|
|
</param>
|
|
</params>
|
|
</methodCall>
|
|
</query>
|
|
<error code='403' type='auth'>
|
|
<forbidden xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'/>
|
|
</error>
|
|
</iq>
|
|
]]></example>
|
|
</section1>
|
|
<section1 topic='Service Discovery' anchor='disco'>
|
|
<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>
|
|
<example caption='A disco#info query'><![CDATA[
|
|
<iq type='get'
|
|
from='requester@company-b.com/jrpc-client'
|
|
to='responder@company-a.com/jrpc-server'
|
|
id='disco1'>
|
|
<query xmlns='http://jabber.org/protocol/disco#info'/>
|
|
</iq>
|
|
]]></example>
|
|
<example caption='A disco#info response'><![CDATA[
|
|
<iq type='result'
|
|
to='requester@company-b.com/jrpc-client'
|
|
from='responder@company-a.com/jrpc-server'
|
|
id='disco1'>
|
|
<query xmlns='http://jabber.org/protocol/disco#info'>
|
|
<identity category='automation' type='rpc'/>
|
|
<feature var='jabber:iq:rpc'/>
|
|
</query>
|
|
</iq>
|
|
]]></example>
|
|
</section1>
|
|
<section1 topic='Security Considerations' anchor='security'>
|
|
<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>
|
|
</section1>
|
|
<section1 topic='IANA Considerations' anchor='iana'>
|
|
<p>This document requires no interaction with &IANA;.</p>
|
|
</section1>
|
|
<section1 topic="XMPP Registrar Considerations" anchor='registrar'>
|
|
<section2 topic='Protocol Namespaces' anchor='registrar-ns'>
|
|
<p>The ®ISTRAR; includes 'jabber:iq:rpc' in its registry of protocol namespaces.</p>
|
|
</section2>
|
|
<section2 topic='Service Discovery Identity' anchor='registrar-disco'>
|
|
<p>The XMPP Registrar includes a Service Discovery type of "rpc" within the "automation" category in its registry of service discovery identities.</p>
|
|
</section2>
|
|
</section1>
|
|
<section1 topic='XML Schema'>
|
|
<code><![CDATA[
|
|
<?xml version='1.0' encoding='UTF-8'?>
|
|
|
|
<xs:schema
|
|
xmlns:xs='http://www.w3.org/2001/XMLSchema'
|
|
targetNamespace='jabber:iq:rpc'
|
|
xmlns='jabber:iq:rpc'
|
|
elementFormDefault='qualified'>
|
|
|
|
<xs:annotation>
|
|
<xs:documentation>
|
|
The protocol documented by this schema is defined in
|
|
XEP-0009: http://www.xmpp.org/extensions/xep-0009.html
|
|
|
|
There is no official XML schema for XML-RPC. The main body
|
|
of this schema has been borrowed from an unofficial schema
|
|
representation contained in the book "Processing XML With
|
|
Java" by Elliotte Rusty Harold, as located at:
|
|
|
|
http://www.ibiblio.org/xml/books/xmljava/chapters/ch02s05.html
|
|
</xs:documentation>
|
|
</xs:annotation>
|
|
|
|
<xs:element name='query'>
|
|
<xs:complexType>
|
|
<xs:choice minOccurs='0' maxOccurs='1'>
|
|
<xs:element ref='methodCall'/>
|
|
<xs:element ref='methodResponse'/>
|
|
</xs:choice>
|
|
</xs:complexType>
|
|
</xs:element>
|
|
|
|
<xs:element name="methodCall">
|
|
<xs:complexType>
|
|
<xs:all>
|
|
<xs:element name="methodName">
|
|
<xs:simpleType>
|
|
<xs:restriction base="ASCIIString">
|
|
<xs:pattern value="([A-Za-z0-9]|/|\.|:|_)*" />
|
|
</xs:restriction>
|
|
</xs:simpleType>
|
|
</xs:element>
|
|
<xs:element name="params" minOccurs="0" maxOccurs="1">
|
|
<xs:complexType>
|
|
<xs:sequence>
|
|
<xs:element name="param" type="ParamType"
|
|
minOccurs="0" maxOccurs="unbounded"/>
|
|
</xs:sequence>
|
|
</xs:complexType>
|
|
</xs:element>
|
|
</xs:all>
|
|
</xs:complexType>
|
|
</xs:element>
|
|
|
|
<xs:element name="methodResponse">
|
|
<xs:complexType>
|
|
<xs:choice>
|
|
<xs:element name="params">
|
|
<xs:complexType>
|
|
<xs:sequence>
|
|
<xs:element name="param" type="ParamType"/>
|
|
</xs:sequence>
|
|
</xs:complexType>
|
|
</xs:element>
|
|
<xs:element name="fault">
|
|
<!-- What can appear inside a fault is very restricted -->
|
|
<xs:complexType>
|
|
<xs:sequence>
|
|
<xs:element name="value">
|
|
<xs:complexType>
|
|
<xs:sequence>
|
|
<xs:element name="struct">
|
|
<xs:complexType>
|
|
<xs:sequence>
|
|
<xs:element name="member"
|
|
type="MemberType">
|
|
</xs:element>
|
|
<xs:element name="member"
|
|
type="MemberType">
|
|
</xs:element>
|
|
</xs:sequence>
|
|
</xs:complexType>
|
|
</xs:element>
|
|
</xs:sequence>
|
|
</xs:complexType>
|
|
</xs:element>
|
|
</xs:sequence>
|
|
</xs:complexType>
|
|
</xs:element>
|
|
</xs:choice>
|
|
</xs:complexType>
|
|
</xs:element>
|
|
|
|
<xs:complexType name="ParamType">
|
|
<xs:sequence>
|
|
<xs:element name="value" type="ValueType"/>
|
|
</xs:sequence>
|
|
</xs:complexType>
|
|
|
|
<xs:complexType name="ValueType" mixed="true">
|
|
<xs:choice>
|
|
<xs:element name="i4" type="xs:int"/>
|
|
<xs:element name="int" type="xs:int"/>
|
|
<xs:element name="string" type="ASCIIString"/>
|
|
<xs:element name="double" type="xs:decimal"/>
|
|
<xs:element name="Base64" type="xs:base64Binary"/>
|
|
<xs:element name="boolean" type="NumericBoolean"/>
|
|
<xs:element name="dateTime.iso8601" type="xs:dateTime"/>
|
|
<xs:element name="array" type="ArrayType"/>
|
|
<xs:element name="struct" type="StructType"/>
|
|
</xs:choice>
|
|
</xs:complexType>
|
|
|
|
<xs:complexType name="StructType">
|
|
<xs:sequence>
|
|
<xs:element name="member" type="MemberType"
|
|
maxOccurs="unbounded"/>
|
|
</xs:sequence>
|
|
</xs:complexType>
|
|
|
|
<xs:complexType name="MemberType">
|
|
<xs:sequence>
|
|
<xs:element name="name" type="xs:string" />
|
|
<xs:element name="value" type="ValueType"/>
|
|
</xs:sequence>
|
|
</xs:complexType>
|
|
|
|
<xs:complexType name="ArrayType">
|
|
<xs:sequence>
|
|
<xs:element name="data">
|
|
<xs:complexType>
|
|
<xs:sequence>
|
|
<xs:element name="value" type="ValueType"
|
|
minOccurs="0" maxOccurs="unbounded"/>
|
|
</xs:sequence>
|
|
</xs:complexType>
|
|
</xs:element>
|
|
</xs:sequence>
|
|
</xs:complexType>
|
|
|
|
<xs:simpleType name="ASCIIString">
|
|
<xs:restriction base="xs:string">
|
|
<xs:pattern value="([ -~]|\n|\r|\t)*" />
|
|
</xs:restriction>
|
|
</xs:simpleType>
|
|
|
|
<xs:simpleType name="NumericBoolean">
|
|
<xs:restriction base="xs:boolean">
|
|
<xs:pattern value="0|1" />
|
|
</xs:restriction>
|
|
</xs:simpleType>
|
|
|
|
</xs:schema>
|
|
]]></code>
|
|
</section1>
|
|
</xep>
|