Delivery receipts in OMEMO groups

[N-Pex]

@chrisballinger It seems the problem lies in XMPPFramework, Extensions/XEP-0184/XMPPMessageDeliveryReceipts.m, line 143. We don't request receipts for group messages. Is there a particular reason for this? If I comment out that check everything seems to work for me.

[tiffrobo]

What should I see when testing?

What I am seeing: Whoever has OMEMO turned on in the group:

• gets double checks and a shield when they send messages (provided the messages go thru).
• sends a message to them, they see a shield next to the delivered message.

If someone does NOT have OMEMO turned on in the group:

• they see double checks when they send messages.
• if someone with OMEMO turned on sends them a message, the person who does not have OMEMO turned on sees a shield next to the delivered message.

Device: iPhone 6, iPhone 7, iPad OS: 10.3.3, 11.2.2, 10.3.2 App version: build 129

[chrisballinger]

@N-Pex Ah good catch. I'm not sure the original reasoning. We do manually add the receipt request:

    @objc public func sendRoomMessage(_ message: OTRXMPPRoomMessage) {
        let elementId = message.xmppId ?? message.uniqueId
        let body = XMLElement(name: "body", stringValue: message.messageText)
        let xmppMessage = XMPPMessage(messageType: nil, to: nil, elementID: elementId, child: body)
        xmppMessage.addReceiptRequest()
        let originId = message.originId ?? message.xmppId ?? message.uniqueId
        xmppMessage.addOriginId(originId)
        send(xmppMessage)
    }

Wonder why that doesn't work as expected.

[N-Pex]

@chrisballinger Because the OMEMO group messages never go down that path, please see MessageQueueHandler.sendGroupMessage. Do you want me to submit a pull request for XMPPFramework (Robbie's upstream repo) or should we just add "addReceiptRequest()" to the other places where it's needed?

[chrisballinger]

I think either approach is fine. If you put a PR for XMPPFramework I'd suggest adding a BOOL option that retains the old behavior by default. The sending was decoupled from OMEMOModule a while ago so it's a lot easier to do manually: https://github.com/robbiehanson/XMPPFramework/blob/master/Extensions/OMEMO/OMEMOModule.h#L132

[cstiens]

@N-Pex will you close this or tag it with 'Test Again' when you feel that your part of the work is done?

[N-Pex]

Ok, should work in build 130

[cstiens]

Thanks @N-Pex I'm going to move this to the 'test again' milestone so we can keep our eye on how consistent the delivery receipts are. So, far, they are showing up now!