Here's your weekly spec update! The heart of Matrix is the specification - and this is modified by Matrix Spec Change (MSC) proposals. Learn more about how the process works at https://spec.matrix.org/proposals.
MSC Status
New MSCs:
MSCs in Final Comment Period:
Accepted MSCs:
Closed MSCs:
- No MSCs were closed/rejected this week.
Spec Updates
This week we have been preparing for IETF117, Matrix 1.8, Matrix 1.9, and Messaging Layer Security (MLS) for Matrix. Most of our work on globally interoperable communications is ongoing through the More Instant Messaging Interoperability (MIMI) working group at the IETF, and will be making significant strides in the coming days as we head to the IETF117 hackathon and meetup.
Over the last few months we've been working on a version of Linearized Matrix which supports the simplicity of linear event history while being fully compatible with today's Matrix network, and while we think that the 03 draft we wrote up accomplishes a lot of this, there's further work to be done to make it cleaner and easier to use. We've also been writing implementations of it to prove the semantics (and find areas which need improvement), starting with our cleanroom eigen-server TypeScript implementation and interoperating it with a branch of Synapse. During IETF117 we expect more implementations to sprout and have their interoperability tested - watch this space for updates on how that goes.
Aside from IETF117, we're continuing to look at the previously-selected Matrix 1.8 MSCs for release in mid-late August 2023. This might be slow over the next couple of weeks while half of us are at IETF117, but expect more forward progress when we get back. Matrix 1.9 is scheduled to be released sometime in November 2023, and a few months ago we said we were aiming to plan ahead for releases a bit more deliberately. Starting this week, we're accepting submissions for ideas and specific MSCs which need our attention in Matrix 1.9. If you have an MSC (current or future) which will need Spec Core Team (SCT) attention between August 2023 and November 2023, let us know in the SCT Office room. Once Matrix 1.8 is released (exact date TBD) we will have limited availability to add things to the Matrix 1.9 target - please raise your MSCs & themes as soon as possible. The current set of MSCs up for consideration can be found on the SCT Intake Board.
If you've made it this far in our weekly update, congratulations, and thank you. We expect things will rapidly start to happen with IETF117 kicking off tomorrow (July 22, 2023), and we will do our best to keep folks updated. Next week's TWIM in particular will have a post-IETF117 debrief for your reading enjoyment :)
As always, if you have any questions or concerns about what we're working on, visit the SCT Office and let us know. We can't promise a prompt reply (particularly during IETF117), but we will take a look when we can.
Random MSC of the Week
The random MSC of the week is... MSC3105: Previewing UIA flows!
This MSC addresses a shortcoming in the current User-Interactive Authentication (UIA) mechanism where attempting to deduce the required authentication flows for an action will result in that action being carried out if it turns out no flows were required. This makes it tricky for a client to present a "are you sure you want to do X?" as a final step in completing an action that requires authentication.
The proposals aims to allow an OPTIONS pre-flight HTTP request to the same endpoint in order to retrieve the flows necessary, without actually carrying out the action. The proposal does note that using OPTIONS for this case is a bit non-standard though, and some clients may treat the typical 401 error code returned during User-Interactive Auth as a fatal error.
While this does address a flaw in the UIA system, it's worth noting that many other flaws exist! Matrix is planning to move over to an OpenID Connect-based authentication system in the not too distant future, which will likely have far fewer edge cases than our traditional, home-grown one. You can visit https://areweoidcyet.com/ for more information and to track the current progress on that front.
