diff --git a/xep-0359.xml b/xep-0359.xml index 827889a9..db25752c 100644 --- a/xep-0359.xml +++ b/xep-0359.xml @@ -9,7 +9,7 @@
Unique and Stable Stanza IDs - This specification describes unique and stable IDs for stanzas. + This specification describes unique and stable IDs for messages. &LEGALNOTICE; 0359 Experimental @@ -23,6 +23,17 @@ stanza-id &flow; + + 0.5.0 + 2017-08-23 + dg + +
    +
  • Business rules clarifications
    • +
  • Define stanza-ids for messages only
    • +
+ + 0.4.1 2017-05-20 @@ -94,14 +105,14 @@
-

This XEP introduces unique and stable IDs for stanzas, which are beneficial in various ways. For example, they can be used together with &xep0313; to uniquely identify a message within an archive. They are also useful in the context of &xep0045; conferences, as they allow to identify a message reflected by a MUC service back to the originating entity.

+

This XEP introduces unique and stable IDs for messages, which are beneficial in various ways. For example, they can be used together with &xep0313; to uniquely identify a message within an archive. They are also useful in the context of &xep0045; conferences, as they allow to identify a message reflected by a MUC service back to the originating entity.

 + by='room@muc.example.com'/> ]]>

In order to create a &stanza-id; extension element, the creating XMPP entity generates and sets the value of the 'id' attribute, and puts its own XMPP address as value of the 'by' attribute. The value of the 'id' attribute must be unique and stable, i.e. it MUST NOT change later for some reason within the scope of the 'by' value. Thus the IDs defined in this extension MUST be unique and stable within the scope of the generating XMPP entity. It is RECOMMENDED that the ID generating service uses UUID and the algorithm defined in &rfc4122; to generate the IDs.

 @@ -111,7 +122,7 @@

Typical body text @@ -121,39 +132,39 @@

Typical body text + by='room@muc.example.com'/> ]]>
    -
  1. XMPP entities, which are routing stanzas, MUST NOT strip any elements qualified by the 'urn:xmpp:sid:0' namespace from message stanzas. They SHOULD however ensure that those elements contain only the attributes defined herein, and take appropriate countermeasures if this is not the case (e.g. removing those attributes).
  2. The values of the 'id' attribute SHOULD be unpredictable.
    3. -
  3. Stanza ID generating entities, which encounter a &stanza-id; element where 'id' is already set and where the 'by' attribute matches their own XMPP address, MUST ignore the existing value of 'id' and override it.
    4. +
  4. Stanza ID generating entities, which encounter a &stanza-id; element where the 'by' attribute matches the 'by' attribute they would otherwise set, MUST delete that element even if they are not adding their own stanza ID.
    5. +
  5. Entities, which are routing stanzas, SHOULD NOT strip any elements qualified by the 'urn:xmpp:sid:0' namespace from message stanzas unless the preceding rule applied to those elements.
  6. Stanzas MUST possess, in the direct child level of the stanza, at most one &stanza-id; extension element with the same XMPP address as value of the 'by' attribute.
  7. Every &stanza-id; extension element MUST have the 'id' attribute and the 'by' attribute set.
  8. Every &stanza-id; and &origin-id; extension element MUST always possess an 'id' attribute and MUST NOT have any child elements or text content.
    9. -
  9. The value of the 'by' attribute MUST be the XMPP address of the entity assigning the unique and stable stanza ID. Note that XMPP addresses are normalized as defined in &rfc6122;
    10. +
  10. The value of the 'by' attribute MUST be the XMPP address of the entity assigning the unique and stable stanza ID. For one-on-one messages the assigning entity is the account. In groupchats the assigning entity is the room. Note that XMPP addresses are normalized as defined in &rfc6122;.
 -

An entity that follows the business rules, especially the rule on overriding the ID in elements where the by atttribute matches the entities own XMPP address, SHOULD announce the 'urn:xmpp:sid:0' namespace in its disco features allowing other entities to verify that those business rules are properly enforced.

- An entity that follows the business rules, especially the rule on overriding the ID in elements where the by atttribute matches the 'by' attribute they would otherwise set, SHOULD announce the 'urn:xmpp:sid:0' namespace in its disco features allowing other entities to verify that those business rules are properly enforced.

+ ]]> @@ -167,6 +178,7 @@

The value of the 'id' attribute should not provide any further information besides the opaque ID itself. Entities observing the value MUST NOT be able to infer any information from it, e.g. the size of the message archive. The value of 'id' MUST be considered a non-secret value.

+

Before processing the stanza ID of a message and using it for deduplication purposes or for MAM catchup, the receiving entity SHOULD ensure that the stanza ID could not have been faked, by verifying that the entity referenced in the by attribute does annouce the 'urn:xmpp:sid:0' namespace in its disco features.

This document requires no interaction with &IANA;.