Expand Matrix URI scheme actions to include action=knock

[Mikaela]

Is your feature request related to a problem? Please describe.

Matrix URI scheme currently only mentions actions join and chat.

• https://spec.matrix.org/latest/appendices/#matrix-uri-scheme

Describe the solution you'd like

I would like there to be an action knock too, to communicate to developers that this is a usecase that should be handled as knocking has been part of the specification since 1.1

Describe alternatives you've considered

One option would be communicating to clients to knock if join fails.

Additional context

Nheko handles the knock action (and in room gave me a permission to open this issue): Nheko-Reborn/nheko@6f8babc

[ShadowJonathan]

Wouldn’t this be covered under action=join?

Couldn’t that spec segment be reworded to include “knock” as a valid action?

(cc @turt2live and @KitsuneRal)

[KitsuneRal]

Yes, and it takes a pretty small straightforward MSC, before adding it to the spec text. How about drafting one? :)

[ShadowJonathan]

Sounds good, I talked to @Mikaela and Nico (from Nheko) about it, and so I'll make that MSC

[Mikaela]

Would this also be reflected in matrix.to handling or does it need a different issue?

[KitsuneRal]

matrix.to predates Matrix URIs and doesn't abide by their conventions. You'll have to submit a separate issue at its repo.

[turt2live]

the spec for matrix.to exists on our end though? The project's support is of course a different issue, but the specification for what it should do is needed here.

[Mikaela]

I am having difficulties getting to my mindset 8 days ago on what exactly is the issue on matrix.to side considering it just attempts to open clients and offers commands. Should it be aware of join_rule and offer /knock for Nheko users instead of join? Won't clients just offee knocking if join fails as per #3780? If not, isn't that client rather than matrix.to issue or even another spec issue?

[turt2live]

it should just work with the clients, but if matrix.to is translating the link into something for the client to open with then matrix.to needs to be aware of how to do that for the client.