MSC1767: Extensible event types & fallback in Matrix (v2) #1767

ara4n · 2019-01-01T22:59:26Z

Obsoletes #1225

Implementations:

SDK: https://github.com/matrix-org/matrix-events-sdk
- Current version of this MSC in the SDK: Rewrite to support content blocks & improved parser matrix-events-sdk#22
- Usage in Element Web (current version of this MSC): React, JS
- Usage in Element Web (v1 of this MSC): React, JS

Proven by other MSC implementations as well (may be an older version of this MSC, but still compatible on a technical level):

Polls: MSC3381: Polls (mk II) #3381
Voice Messages: MSC3245: Voice messages (using extensible events) #3245
Static Location Sharing: MSC3488: Extending events with location data #3488

Early conceptual work for extensible events usage:

matrix-art: https://github.com/MTRNord/matrix-art/blob/154c3af36b7db5502fec26ad380079c712de0756/helpers/event_types.ts

Articles:

https://www.artificialworlds.net/blog/2022/03/08/comparison-of-matrix-events-before-and-after-extensible-events/

FCP tickyboxes

proposals/1767-extensible-events.md

non-Jedi

In general, I like this much better than previously. Still strongly believe we should have server-side permission control on event types in non-e2ee rooms.

proposals/1767-extensible-events.md

ara4n · 2019-01-08T12:44:49Z

@non-Jedi many thanks for cogitating on this and reviewing :)

alphapapa · 2019-01-12T06:57:55Z

I feel like this is much clearer and simpler than the previous Google doc version. At least, as a client dev, this doesn't scare me much. :) Thanks.

proposals/1767-extensible-events.md

florianjacob · 2020-01-14T13:57:26Z

I wonder what should happen if a custom state event is extended, e.g. with a text fallback? It could make sense to store the temperature example as state event, keyed by sensors / sensor location, and then the home automation system can directly query the current state and does not have to bother with syncing & filtering until the correct one is found. Still, as custom state events are invisible for normal clients, extending them with a non-state-events to associate a fallback or other one-off / change-related information could help, though that should probably not end up in the actual room state…

I guess “the whole thing is now a state event with all content as value” would also work out, though I think the semantics thould be specified in the MSC.

Example:

{
    "type": "net.arasphere.temperature",
    "state_key": "living_room",
    "content": {
        # one-off non-state events associated with the state change,
         # but not needed in the actual room state?
        "m.text": "The living room temperature rose by 1.5C. It is now 37C",
        "m.html": "The living room temperature rose by <font color='#f00'1.5C</font>. It is now <font color='#f00'>37C</font>",
        "net.arasphere.temperature.diff": {
            "temperature_rise": 1.5
        }
        # actual state event?
        "net.arasphere.temperature": {
            "temperature": 37.0
        }
    }
}

mscbot · 2023-02-05T19:04:35Z

The final comment period, with a disposition to merge, as per the review above, is now complete.

mscbot · 2023-02-07T09:05:02Z

🔔 This is now entering its final comment period, as per the review above. 🔔

turt2live · 2023-02-07T16:30:33Z

(Someone ticked their box post-fcp, and the bot is confused: ignore it)

* first cut of MSC1767 for extensible events (replaces MSC1225) * tabs->spaces * fix markdown * fix markdown * GFM needs two spaces after ##? * delta from msc1225 * 2021 refresh * Refactor to be just text messaging + schema * Update MSC numbers * Touchups for FCP * *ahem* * Rewrite MSC to be understandable? * Update proposals/1767-extensible-events.md * Rewrite MSC, again * Clarify Andy's blog state * Relax m.markup's requirements * Misc clarifications * Revert "Relax m.markup's requirements" This reverts commit 5f15b9f. * Clarify push rules handling * Fix example * Update extensible events MSCs list * Update Andy's blog post reference * Update per review feedback * Move emotes, notices, and encryption out to dedicated MSCs * Clarify text throughout * Cover all the bases * Clarify mixins are exactly what they're assumed to be * Clarify fallback and number of datums per event * Fix description of plain text baseline * Clarify SCT's role in feature scope & cut "mixed" events (not mixins) * Fix description of mixins * Update proposals/1767-extensible-events.md Co-authored-by: David Baker <[email protected]> * Expand on how unknown events are handled * Apply suggestions from code review Co-authored-by: Richard van der Hoff <[email protected]> * Trim line length post-suggestions * Mention that extensible events might appear in other room versions early * Remove duplicated unknown parse order being an implementation detail * Note difference between optional content blocks and mixins * Apply suggestions from code review Co-authored-by: Richard van der Hoff <[email protected]> * Update proposals/1767-extensible-events.md Co-authored-by: Alexey Rusakov <[email protected]> * Clarify that clients are still strongly encouraged to validate HTML * Fix mention of mixing legacy event types * Update proposals/1767-extensible-events.md Co-authored-by: Andrew Morgan <[email protected]> * Link to MSC3765 * Rename `m.markup` to `m.text` --------- Co-authored-by: Travis Ralston <[email protected]> Co-authored-by: Travis Ralston <[email protected]> Co-authored-by: David Baker <[email protected]> Co-authored-by: Richard van der Hoff <[email protected]> Co-authored-by: Alexey Rusakov <[email protected]> Co-authored-by: Andrew Morgan <[email protected]>

anoadragon453 · 2023-07-13T13:37:10Z

proposals/1767-extensible-events.md

+Another possible mixin would be `m.relates_to` (not described by this MSC). Currently,
+some features like the [key verification framework](https://spec.matrix.org/v1.5/client-server-api/#key-verification-framework)
+rely on relationships as part of making the feature work. The expectation is that
+these features would be adapted to meet the "purely additive" condition (assuming
+`m.relates_to` does actually end up being a mixin).


What about reactions? Surely those can't function without a relation being present either.

yea... reactions are awkward. The relationship should be additive (without aggregation key), but representing the aggregation key as a content block is difficult. The expectation is that a dedicated MSC would solve extev reactions.

julioromano · 2023-10-03T21:21:59Z

proposals/1767-extensible-events.md

+blocks and legacy fields, however that approach did not give sufficient reason for clients
+to fully adopt the extensible events changes.
+
+In room versions supporting extensible events, clients MUST only send extensible events.


What happens when an existing room with lots of "old" events is upgraded from a version not supporting extensible events to one that does?

Since events are immutable, does it mean that right after the upgrade almost all the events in the room will not be rendered by the clients anymore effectively making the room look empty?

Upgrading a room creates an entirely new room, "old" events will not be present in there.

noob alert!

Oh I wasn't aware of this, where does the spec mention it?

Here for example: https://spec.matrix.org/v1.8/client-server-api/#server-behaviour-16

Super thanks! I naively thought such an important thing would be mentioned in https://spec.matrix.org/v1.8/rooms/ . I still have to get used at how the spec chapters are organized.

Gnuxie · 2024-05-30T22:17:21Z

proposals/1767-extensible-events.md

+showing up in the plaintext or in tertiary formats on the events. Historically, room
+moderators have been pretty good about removing these malicious senders from their rooms
+when other users point out (quite quickly) that the event is appearing funky to them.
+


m.room.power_levels provide no way of restricting what media (via mixins) you can embed into events.

@Gnuxie could you write this up as a new matrix-spec issue to make sure it doesn't get lost?

matrix-org/matrix-spec#1932

KnowledgeGarden · 2024-08-16T21:35:49Z

Perhaps an extremely naive question, but here goes:
Suppose I want to do something in a Matrix client much like, say, Kialo, events for which are new text messages, but they are situated in the context of a parent node, which, itself, is situated in a Pro-Con debate graph; the view painted would be, first, the graph, then, when a node is selected, the graph shifts to place that node as the local "root" at the top.
My question, then, is this: can an extensible message type allow for a type which entails an entire JSON graph object with individual nodes?
Many thanks in advance - Jack

KnowledgeGarden · 2024-08-17T16:54:57Z

@Gnuxie Thanks for that link. I'm at a loss. It circularly points back to this issue.
m.room.power_levels is not mentioned in the latest api spec at
https://spec.matrix.org/latest/
but it is at
https://spec.matrix.org/legacy/client_server/r0.2.0.html
and
https://spec.matrix.org/unstable/rooms/v1/ and https://ems-docs.element.io/books/element-support/page/managing-a-room-advanced-room-management
There is a page on using that property at
https://snyk.io/advisor/npm-package/m/functions/m.room.power_levels

Power Levels is a State parameter. I am curious why it shows up here. I'm looking for an example of how powerlevels affects media type.
I am asking about Message Type flexibility.
I got a hint about it here
https://github.com/matrix-org/matrix-events-sdk
which is buried in Element dependencies, but that repo hasn't been touched since last year and is still marked as "work in progress" and "use at your own risk".
I suspect that extensible message types is not particularly high a priority.

Gnuxie · 2024-08-17T19:14:02Z

@KnowledgeGarden sorry the link is unrelated, you just bumped the PR and reminded me to open an issue that i forgot about.

first cut of MSC1767 for extensible events (replaces MSC1225)

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ara4n changed the title ~~first cut of MSC1767 for extensible events (replaces MSC1225)~~ MSC1767: Extensible event types & fallback in Matrix (v2) Jan 1, 2019

ara4n added proposal A matrix spec change proposal proposal-pr T-Core labels Jan 1, 2019

ara4n mentioned this pull request Jan 1, 2019

Extensible event types & fallback in Matrix #1225

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ara4n added 5 commits January 1, 2019 23:29

tabs->spaces

ba2c279

fix markdown

132526c

fix markdown

dcedbeb

GFM needs two spaces after ##?

02f257a

delta from msc1225

e8d8b94

richvdh self-requested a review January 2, 2019 07:25

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This was referenced Jan 16, 2019

Support unread message counts server-side matrix-org/synapse#2632

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WIPish: MSC1769: Extensible profiles as rooms #1769

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richvdh removed their request for review February 27, 2019 11:10

ara4n mentioned this pull request Aug 12, 2019

MSC2184: Allow the use of the HTML <details> tag #2184

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Allow clients not supporting a feature to display a human readable description of ignored events. #2410

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MSC1840: Typed rooms #1840

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Messages with attached image only show image url Sorunome/matrix-slack-parser#2

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turt2live added kind:feature MSC for not-core and not-maintenance stuff and removed proposal-pr labels Apr 20, 2020

Rename m.markup to m.text

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Rename m.markup and friends to m.text matrix-org/matrix-events-sdk#23

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mscbot added finished-final-comment-period and removed disposition-merge final-comment-period This MSC has entered a final comment period in interest to approval, postpone, or delete in 5 days. labels Feb 5, 2023

turt2live merged commit fe8be28 into old_master Feb 6, 2023

turt2live added spec-pr-missing Proposal has been implemented and is being used in the wild but hasn't yet been added to the spec blocked Something needs to be done before action can be taken on this PR/issue. and removed finished-final-comment-period labels Feb 6, 2023

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FCP can be started again after one had successfully completed matrix-org/mscbot-python#32

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MSC3955: Extensible Events - Automated event mixin (notices) #3955

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MSC2997: Add t-shirt #2997

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m.room.power_levels provide no way of restricting the media (via mixins) you can embed into events. matrix-org/matrix-spec#1932

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MSC1767: Extensible event types & fallback in Matrix (v2) #1767

MSC1767: Extensible event types & fallback in Matrix (v2) #1767

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MSC1767: Extensible event types & fallback in Matrix (v2) #1767

MSC1767: Extensible event types & fallback in Matrix (v2) #1767

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