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Code Issues Releases Wiki Activity

XEP-0153: Clarify encoding of update hash

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This commit is contained in:
Jonas Wielicki 2018-02-26 08:11:18 +01:00
parent 97f21995a2
commit d3cc6bcf9d
1 changed files with 10 additions and 3 deletions
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xep-0153.xml
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@ -26,6 +26,12 @@
<url>http://www.xmpp.org/schemas/vcard-avatar.xsd</url>
</schemaloc>
&stpeter;
<revision>
<version>1.1</version>
<date>2018-02-26</date>
<initials>jwi</initials>
<remark>Clarify encoding of the photo hash in the presence update.</remark>
</revision>
<revision>
<version>1.0</version>
<date>2006-08-16</date>
@ -110,14 +116,15 @@
<example caption="User&apos;s Server Acknowledges Publish"><![CDATA[
<iq to='juliet@capulet.com' type='result' id='vc1'/>
]]></example>
<p>Next, the user's client computes the SHA1 hash of the avatar image data itself (not the base64-encoded version) in accordance with &rfc3174;. This hash is then included in the user's presence information as the XML character data of the &lt;photo/&gt; child of an &X; element qualified by the 'vcard-temp:x:update' namespace, as shown in the following example:</p>
<p>Next, the user's client computes the SHA1 hash of the avatar image data itself (not the base64-encoded version) in accordance with &rfc3174;. This hash is then included in the user's presence information. This is done by putting the hash encoded as hexadecimal digits as the XML character data of the &lt;photo/&gt; child of an &X; element qualified by the 'vcard-temp:x:update' namespace, as shown in the following example:</p>
<example caption="User&apos;s Client Includes Avatar Hash in Presence Broadcast"><![CDATA[
<presence from='juliet@capulet.com/balcony'>
<x xmlns='vcard-temp:x:update'>
<photo>sha1-hash-of-image</photo>
<photo>01b87fcd030b72895ff8e88db57ec525450f000d</photo>
</x>
</presence>
]]></example>
<p>Note that while XML Schema defines the canonical representation of hexadecimal values to be upper-case, the historical use throughout the XMPP ecosystem has established lower-case use. Entities need to be able to process both and may prefer to emit lower-case for compatibility.</p>
<p>The user's server then broadcasts that presence information to all contacts who are subscribed to the user's presence information.</p>
</section2>
<section2 topic='Contact Retrieves Avatar' anchor='retrieve'>
@ -270,7 +277,7 @@
<xs:element name='x'>
<xs:complexType>
<xs:sequence>
<xs:element name='photo' minOccurs='0' type='xs:base64Binary'/>
<xs:element name='photo' minOccurs='0' type='xs:hexBinary'/>
</xs:sequence>
</xs:complexType>
</xs:element>