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1.0 DRAFT
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xep-0191.xml
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xep-0191.xml
@ -10,7 +10,7 @@
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<abstract>This document specifies an XMPP protocol extension for simple communications blocking.</abstract>
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&LEGALNOTICE;
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<number>0191</number>
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<status>Proposed</status>
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<status>Draft</status>
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<type>Standards Track</type>
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<jig>Standards JIG</jig>
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<dependencies>
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@ -22,6 +22,12 @@
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<supersededby>None</supersededby>
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<shortname>blocking</shortname>
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&stpeter;
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<revision>
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<version>1.0</version>
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<date>2006-11-21</date>
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<initials>psa</initials>
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<remark><p>Per a vote of the XMPP Council, advanced status to Draft; also modified namespace to use XMPP URN.</p></remark>
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</revision>
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<revision>
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<version>0.5</version>
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<date>2006-11-06</date>
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@ -77,8 +83,8 @@
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</ol>
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</section1>
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<section1 topic='Relationship to Privacy Lists' anchor='privacy'>
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<p>The simple communications blocking protocol specified herein is intended to be a user-friendly "front end" to a subset of the functionality defined by the privacy lists protocol. If a service deploys both privacy lists and simple communications blocking, both protocols MUST use the same back-end data store.</p>
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<p>Wherever possible, this document attempts to define a protocol that is fully consistent with <cite>XEP-0016</cite>. If a particular aspect of functionality (e.g., stanza processing or JID matching rules) is not specified herein, the relevant text in <cite>XEP-0016</cite> shall be taken to apply.</p>
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<p>The simple communications blocking protocol specified herein is intended to be a user-friendly "front end" to a subset of the functionality defined by the privacy lists protocol (<cite>XEP-0016</cite>). If a service deploys both privacy lists and simple communications blocking, both protocols MUST use the same back-end data store.</p>
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<p>Wherever possible, this document attempts to define a protocol that is fully consistent with <cite>XEP-0016</cite>. If a particular aspect of functionality is not specified herein, the relevant text in <cite>XEP-0016</cite> shall be taken to apply.</p>
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</section1>
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<section1 topic='JID Matching' anchor='matching'>
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<p>Matching of JIDs as specified in the 'jid' attribute of the <item/> element SHOULD proceed in the following order (this is consistent with <cite>XEP-0016</cite>):</p>
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@ -97,28 +103,28 @@
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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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<p>If the server supports the protocol defined herein, it MUST return a feature of "http://jabber.org/protocol/blocking":</p>
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<p>If the server supports the protocol defined herein, it MUST return a feature of "urn:xmpp:blocking":</p>
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<example caption='Service discovery response'><![CDATA[
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<iq from='capulet.com' to='juliet@capulet.com/chamber' type='result' id='disco1'>
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<query xmlns='http://jabber.org/protocol/disco#info'>
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...
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<feature var='http://jabber.org/protocol/blocking'/>
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<feature var='urn:xmpp:blocking'/>
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...
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</query>
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</iq>
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]]></example>
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</section2>
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<section2 topic='User Retrieves Block List' anchor='blocklist'>
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<p>In order for a client to request a user's list of blocked contacts (e.g., in order to determine whether to unblock a contact), it shall send an IQ-get with no 'to' address (thus handled by the user's server) containing a <blocklist/> element qualified by the 'http://jabber.org/protocol/blocking' namespace:</p>
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<p>In order for a client to request a user's list of blocked contacts (e.g., in order to determine whether to unblock a contact), it shall send an IQ-get with no 'to' address (thus handled by the user's server) containing a <blocklist/> element qualified by the 'urn:xmpp:blocking' namespace:</p>
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<example caption='Client requests blocklist'><![CDATA[
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<iq type='get' id='blocklist1'>
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<blocklist xmlns='http://jabber.org/protocol/blocking'/>
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<blocklist xmlns='urn:xmpp:blocking'/>
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</iq>
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]]></example>
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<p>If the user has any contacts in its blocklist, the server MUST return an IQ-result containing a <blocklist/> element that in turn contains one child <item/> element for each blocked contact:</p>
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<example caption='Server returns blocklist with items'><![CDATA[
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<iq type='result' id='blocklist1'>
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<blocklist xmlns='http://jabber.org/protocol/blocking'>
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<blocklist xmlns='urn:xmpp:blocking'>
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<item jid='romeo@montague.net'/>
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<item jid='iago@shakespeare.lit'/>
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</blocklist>
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@ -127,16 +133,16 @@
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<p>If the user has no contacts in its blocklist, the server MUST return an IQ-result containing an empty <blocklist/> element:</p>
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<example caption='Server returns empty blocklist'><![CDATA[
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<iq type='result' id='blocklist1'>
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<blocklist xmlns='http://jabber.org/protocol/blocking'/>
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<blocklist xmlns='urn:xmpp:blocking'/>
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</iq>
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]]></example>
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<p>A client SHOULD retrieve the block list after authenticating with its server and before completing any blocking or unblocking operations.</p>
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</section2>
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<section2 topic='User Blocks Contact' anchor='block'>
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<p>In order for a user to block communications with a contact, the user's client shall send an IQ-set with no 'to' address (thus handled by the user's server) containing a <block/> element qualified by the 'http://jabber.org/protocol/blocking' namespace, where the JID to be blocked is encapsulated as the 'jid' attribute of the <item/> child element:</p>
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<p>In order for a user to block communications with a contact, the user's client shall send an IQ-set with no 'to' address (thus handled by the user's server) containing a <block/> element qualified by the 'urn:xmpp:blocking' namespace, where the JID to be blocked is encapsulated as the 'jid' attribute of the <item/> child element:</p>
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<example caption='Block command'><![CDATA[
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<iq from='juliet@capulet.com/chamber' type='set' id='block1'>
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<block xmlns='http://jabber.org/protocol/blocking'>
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<block xmlns='urn:xmpp:blocking'>
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<item jid='romeo@montague.net'/>
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</block>
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</iq>
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<p>The server MUST also send an IQ-set to all of the user's resources that have requested the blocklist, containing the blocked item(s):</p>
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<example caption='Block "push"'><![CDATA[
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<iq to='juliet@capulet.com/chamber' type='set' id='push1'>
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<block xmlns='http://jabber.org/protocol/blocking'>
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<block xmlns='urn:xmpp:blocking'>
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<item jid='romeo@montague.net'/>
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</block>
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</iq>
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<iq to='juliet@capulet.com/balcony' type='set' id='push2'>
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<block xmlns='http://jabber.org/protocol/blocking'>
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<block xmlns='urn:xmpp:blocking'>
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<item jid='romeo@montague.net'/>
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</block>
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</iq>
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<ul>
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<li>For presence stanzas (including notifications, subscriptions, and probes), the server MUST NOT respond and MUST NOT return an error.</li>
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<li>For message stanzas, the server SHOULD return an error, which SHOULD be &unavailable;.</li>
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<li>For IQ stanzas, the server MUST return an error, which SHOULD be &unavailable;.</li>
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<li>For IQ stanzas of type "get" or "set", the server MUST return an error, which SHOULD be &unavailable;. IQ stanzas of other types MUST be silently dropped by the server.</li>
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</ul>
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<p>If the foregoing suggestions are followed, the user will appear offline to the contact.</p>
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<p>If the user attempts to send an outbound stanza to the contact, the user's server MUST NOT route the stanza to the contact but instead MUST return a ¬acceptable; error containing an application-specific error condition of <blocked/> qualified by the 'http://jabber.org/protocol/blocking#errors' namespace:</p>
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<p>If the user attempts to send an outbound stanza to the contact, the user's server MUST NOT route the stanza to the contact but instead MUST return a ¬acceptable; error containing an application-specific error condition of <blocked/> qualified by the 'urn:xmpp:blocking:errors' namespace:</p>
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<example caption='Error: contact is blocked'><![CDATA[
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<message type='error' from='romeo@montague.net' to='juliet@capulet.com'>
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<body>Can you hear me now?</body>
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<error type='cancel'>
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<not-acceptable xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'/>
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<blocked xmlns='http://jabber.org/protocol/blocking#errors'/>
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<blocked xmlns='urn:xmpp:blocking:errors'/>
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</error>
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</message>
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]]></example>
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</section2>
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<section2 topic='User Unblocks Contact' anchor='unblock'>
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<p>In order for a user to unblock communications with a contact, the user's client shall send an IQ-set with no 'to' address (thus handled by the user's server) containing an <unblock/> element qualified by the 'http://jabber.org/protocol/blocking' namespace, where the JID to be unblocked is encapsulated as the 'jid' attribute of the <item/> child element:</p>
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<p>In order for a user to unblock communications with a contact, the user's client shall send an IQ-set with no 'to' address (thus handled by the user's server) containing an <unblock/> element qualified by the 'urn:xmpp:blocking' namespace, where the JID to be unblocked is encapsulated as the 'jid' attribute of the <item/> child element:</p>
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<example caption='Unblock contact command'><![CDATA[
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<iq type='set' id='unblock1'>
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<unblock xmlns='http://jabber.org/protocol/blocking'>
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<unblock xmlns='urn:xmpp:blocking'>
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<item jid='romeo@montague.net'/>
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</unblock>
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</iq>
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<p>The server MUST also send an IQ-set to all of the user's resources that have requested the blocklist, containing the unblocked item(s):</p>
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<example caption='Unblock "push"'><![CDATA[
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<iq to='juliet@capulet.com/chamber' type='set' id='push3'>
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<unblock xmlns='http://jabber.org/protocol/blocking'>
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<unblock xmlns='urn:xmpp:blocking'>
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<item jid='romeo@montague.net'/>
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</unblock>
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</iq>
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<iq to='juliet@capulet.com/balcony' type='set' id='push4'>
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<unblock xmlns='http://jabber.org/protocol/blocking'>
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<unblock xmlns='urn:xmpp:blocking'>
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<item jid='romeo@montague.net'/>
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</unblock>
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</iq>
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<p>After the user has unblocked communications with the contact, the user's server MUST deliver any subsequent XML stanzas from the contact to the user.</p>
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</section2>
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<section2 topic='User Unblocks All Contacts' anchor='unblockall'>
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<p>In order for a user to unblock communications with all contacts, the user's client shall send an IQ-set with no 'to' address (thus handled by the user's server) containing an empty <unblock/> element qualified by the 'http://jabber.org/protocol/blocking' namespace:</p>
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<p>In order for a user to unblock communications with all contacts, the user's client shall send an IQ-set with no 'to' address (thus handled by the user's server) containing an empty <unblock/> element qualified by the 'urn:xmpp:blocking' namespace:</p>
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<example caption='Unblock all command'><![CDATA[
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<iq type='set' id='unblock2'>
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<unblock xmlns='http://jabber.org/protocol/blocking'/>
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<unblock xmlns='urn:xmpp:blocking'/>
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</iq>
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]]></example>
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<p>If the server can successfully process the unblock command, it MUST return an IQ-result:</p>
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<p>The server MUST also send an IQ-set to all of the user's resources that have requested the blocklist, containing notification of global unblocking:</p>
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<example caption='Unblock all "push"'><![CDATA[
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<iq to='juliet@capulet.com/chamber' type='set' id='push5'>
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<unblock xmlns='http://jabber.org/protocol/blocking'/>
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<unblock xmlns='urn:xmpp:blocking'/>
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</iq>
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<iq to='juliet@capulet.com/balcony' type='set' id='push6'>
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<unblock xmlns='http://jabber.org/protocol/blocking'/>
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<unblock xmlns='urn:xmpp:blocking'/>
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</iq>
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]]></example>
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<p>Once the user has unblocked communications with all contacts, the user's server MUST deliver any XML stanzas from those contacts to the user.</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; shall include 'http://jabber.org/protocol/blocking' and 'http://jabber.org/protocol/blocking#errors' in its registry of protocol namespaces (see &NAMESPACES;).</p>
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<p>The ®ISTRAR; includes 'urn:xmpp:blocking' and 'urn:xmpp:blocking:errors' in its registry of protocol namespaces (see &NAMESPACES;).</p>
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</section2>
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</section1>
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<section1 topic='XML Schema' anchor='schema'>
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<xs:schema
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xmlns:xs='http://www.w3.org/2001/XMLSchema'
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targetNamespace='http://jabber.org/protocol/blocking'
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xmlns='http://jabber.org/protocol/blocking'
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targetNamespace='urn:xmpp:blocking'
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xmlns='urn:xmpp:blocking'
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elementFormDefault='qualified'>
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<xs:element name='block'>
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</xs:schema>
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]]></code>
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</section2>
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<section2 topic='blocking#errors' anchor='schema-blocking-errors'>
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<section2 topic='blocking:errors' anchor='schema-blocking-errors'>
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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='http://jabber.org/protocol/blocking#errors'
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xmlns='http://jabber.org/protocol/blocking#errors'
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targetNamespace='urn:xmpp:blocking:errors'
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xmlns='urn:xmpp:blocking:errors'
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elementFormDefault='qualified'>
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<xs:element name='blocked' type='empty'/>
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</section2>
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</section1>
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<section1 topic='Acknowledgements' anchor='ack'>
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<p>Thanks to Valerie Mercier, Maciek Niedzielski, and Remko Tronçon for their feedback.</p>
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<p>Thanks to Valerie Mercier, Maciek Niedzielski, Kevin Smith, and Remko Tronçon for their feedback.</p>
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</section1>
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</xep>
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