Hi, I am a developer of MongooseIM (https://github.com/esl/MongooseIM) and currently I am adding the support for message retraction (XEP-0424). There is a growing need for a standard way to support message deletion/retraction, so I like the fact that there is a new specification for it.
According to the XEP: "If a client or service implements message retraction, it MUST specify the 'urn:xmpp:message-retract:0' feature in its service discovery information features". When should the server include this feature in its discovery information? If a client sends a discovery request to the address of the main XMPP service, should the server response contain this feature if the server archives retraction messages in MAM (XEP-0313)? This should be enough to satisfy the only mandatory server-side requirement of the XEP. Another option would be to advertise this feature only if messages are really removed or replaced with tombstones whenever a retract message is received. However, support for actual removal of messages is not mandatory in the XEP. MongooseIM would replace the messages with tombstones if such a feature is enabled by the user. I think that whatever rule is chosen, the same should apply for a MUC service if message archive/retraction is enabled for it. -- Regards, Paweł Chrząszcz
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