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Room version 12 (#2193)
* Placeholder

* i++

* Room version 12

Template out a v12 room version

Make v12 default, per MSC4304

Update PDU checks and auth event selection per MSC4291

Describe new room_id format per MSC4291

Move v6 depth definition to a component for easier referencing

Move room_id to a component to prep for v12, per MSC4291

Create and use a new room_id component for v12+ per MSC4291

Reflect auth events selection change onto all room versions per MSC4291

The MSC asks the `description` of `auth_events` to be adjusted, however this feels like a better representation of the change.

Add `room_id` format rules and renumber per MSC4291

Reflect change to rule 1.2 per MSC4291

Insert same room_id check to v1-12 auth rules per MSC4307 and MSC4291

Deprecate `predecessor.event_id` per MSC4291

Insert auth rule to validate `additional_creators` per MSC4289

Insert rule for `users` validation of creators and renumber per MSC4289

Define "room creator(s)" per MSC4289

Spec `additional_creators` on create events per MSC4289

Spec `additional_creators` on `/upgrade` per MSC4289

The MSC doesn't mention how to handle unsupported room versions, but the Synapse implementation used for FCP ignores the field in such room versions. This feels like a good approach, and will need clarifying in the MSC too (if accepted at the spec level).

Add notes to `/upgrade` behaviour per MSC4289 and MSC4291

Describe how additional creators work during room creation per MSC4289

Fix default user power level descriptions per MSC4289

Describe tombstone power level changes per MSC4289

Warn clients about event format changes in v12 per MSC4289 and MSC4291

Flag additional room creators support for client reference per MSC4289

Remove TODO now that it's fully addressed

Copy state res into v12 as-is for modification

Apply Modification 1 to SR2.1 per MSC4297

Apply Modification 2 to SR2.1 per MSC4297

Add summary box to the top of SR2.1 for ease of developer reference

Modification 2 was split into items 2 and 3 for further ease of understanding.

Add all the changelogs

`x` is used until a real PR number can be assigned.

Some changelogs are duplicated to the Client-Server API to increase visibility of the changes to v12.

Review: Minor phrasing adjustments in changelogs

Review: Clarify that v12 isn't quite the default yet in the changelog

Review: Clarify to clients that creators are immutable

Review: Improve 'how to parse a domain' advice for legacy apps

Review: Add a bit more detail as to why a room ID might be required

Apply suggestions from code review

Co-authored-by: Andrew Morgan <1342360+anoadragon453@users.noreply.github.com>

Clarify that clients can override the tombstone default

Mention creatorship UI label by finishing the Permissions section

We probably should have removed the WIP note in v1.0, but alas.

Add changelog for tombstone changes

Use assigned spec PR number in changelogs

(cherry picked from commit ec81eea7e4532fd398b8013071d6981c97117d9e)
2025-08-14 11:16:00 -06:00
.github ci(build-openapi): indentity routes were missing (#2172) 2025-07-22 15:13:51 +01:00
assets Adjust margins in rendered endpoints (#2081) 2025-04-15 18:35:27 +01:00
attic Add a hyphen between third and party when used as an adjective (#1447) 2023-03-08 09:58:29 +00:00
changelogs Room version 12 (#2193) 2025-08-14 11:16:00 -06:00
config become unstable 2025-06-26 10:48:27 -06:00
content Room version 12 (#2193) 2025-08-14 11:16:00 -06:00
data Room version 12 (#2193) 2025-08-14 11:16:00 -06:00
data-definitions Update data-definitions 2023-08-22 12:04:56 -06:00
informal Update idp-brands.md (#1140) 2022-06-30 15:58:22 -06:00
layouts Look for examples in all possible locations (#2076) 2025-03-05 09:44:59 +00:00
meta Specify a correct spelling for "display name" (#2189) 2025-08-06 07:21:58 +01:00
packages/npm Create @matrix-org/spec npm package containing sas-emoji.json (#1620) 2023-08-18 09:56:55 -06:00
scripts Replace Hugo shortcodes in OpenAPI output (#2088) 2025-05-08 09:29:32 +00:00
static Create funding-manifest-urls (#2115) 2025-03-28 13:19:23 +00:00
.gitignore Optimize generated CSS by removing unused selectors (#2008) 2024-12-10 22:55:14 +00:00
.htmltest.yml Rename .htmltest.yaml to .htmltest.yml (#1985) 2024-10-28 14:21:20 +00:00
CONTRIBUTING.rst update DCO, no legal name needed (#1914) 2024-07-25 17:41:12 -06:00
go.mod Upgrade docsy to 0.11.0 and hugo to 0.139.0 (#1996) 2024-11-19 21:40:34 +00:00
go.sum Upgrade docsy to 0.11.0 and hugo to 0.139.0 (#1996) 2024-11-19 21:40:34 +00:00
LICENSE Add a license to the spec 2016-07-12 17:28:30 +01:00
openapi_extensions.md Rename custom-formats.yaml to string-formats.yaml (#1977) 2024-10-30 22:30:31 +00:00
package-lock.json Optimize generated CSS by removing unused selectors (#2008) 2024-12-10 22:55:14 +00:00
package.json Optimize generated CSS by removing unused selectors (#2008) 2024-12-10 22:55:14 +00:00
postcss.config.js Fix syntax highlighting and click-to-copy buttons for code blocks (#2049) 2025-01-14 18:34:50 +00:00
README.md Upgrade docsy to 0.11.0 and hugo to 0.139.0 (#1996) 2024-11-19 21:40:34 +00:00
redocly.yaml Simplify uses of resolve-refs partial (#1773) 2024-04-09 18:06:53 +01:00

Matrix Specification

This repository contains the Matrix Specification. The current release version is rendered at https://spec.matrix.org, while the latest available build of the main branch is at https://spec.matrix.org/unstable.

Developers looking to use Matrix should join #matrix-dev:matrix.org on Matrix for help.

Spec authors and proposal writers are welcome to join #matrix-spec:matrix.org. We welcome contributions! See CONTRIBUTING.rst for details.

Structure

The Matrix spec is compiled with Hugo (a static site generator) with the following structure:

  • /assets: assets that need postprocessing using Hugo Pipes. For example, Sass files would go here.

  • /content: files that will become pages in the site go here. Typically these are Markdown files with some YAML front matter indicating, among other things, what layout should be applied to this page. The organization of files under /content determines the organization of pages in the built site.

  • /data: this can contain TOML, YAML, or JSON files. Files kept here are directly available to template code as data objects, so templates don't need to load them from a file and parse them. This is also where our OpenAPI definitions and schemas are.

  • /layouts: this contains Hugo templates. Some templates define the overall layout of a page: for example, whether it has header, footer, sidebar, and so on.

    • /layouts/partials: these templates can be called from other templates, so they can be used to factor out template code that's used in more than one template. An obvious example here is something like a sidebar, where several different page layouts might all include the sidebar. But also, partial templates can return values: this means they can be used like functions, that can be called by multiple templates to do some common processing.
    • /layouts/shortcodes: these templates can be called directly from files in /content.
  • /static: static files which don't need preprocessing. JS or CSS files could live here.

  • /themes: you can use just Hugo or use it with a theme. Themes primarily provide additional templates, which are supplied in a /themes/$theme_name/layouts directory. You can use a theme but customise it by providing your own versions of any of the theme layouts in the base /layouts directory. That is, if a theme provides /themes/$theme_name/layouts/sidebar.html and you provide /layouts/sidebar.html, then your version of the template will be used.

It also has the following top-level file:

  • config.toml: site-wide configuration settings. Some of these are built-in and you can add your own. Config settings defined here are available in templates. All these directories above are configurable via config.toml settings.

Additionally, the following directories may be of interest:

  • /attic: Here contains historical sections of specification and legacy drafts for the specification.
  • /changelogs: Various bits of changelog for the specification areas.
  • /data-definitions: Bits of structured data consumable by Matrix implementations.
  • /meta: Documentation relating to the spec's processes that are otherwise untracked (release instructions, etc).
  • /scripts: Various scripts for generating the spec and validating its contents.
  • /packages: Various packages for shipping spec files like OpenAPI bindings and data definitions.

Authoring changes to the spec

Please read CONTRIBUTING.rst before authoring a change to the spec. Note that spec authoring takes place after an MSC has been accepted, not as part of a proposal itself.

  1. Install the extended version (often the OS default) of Hugo: https://gohugo.io/getting-started/installing. Note that at least Hugo v0.123.1 is required.

    Alternatively, use the Docker image at https://hub.docker.com/r/klakegg/hugo/. (The "extended edition" is required to process the SCSS.)

  2. Run npm i to install the dependencies. Note that this will require NodeJS to be installed.

  3. Run npm run get-proposals to seed proposal data. This is merely for populating the content of the "Spec Change Proposals" page and is not required.

  4. Run hugo serve (or docker run --rm -it -v $(pwd):/src -p 1313:1313 klakegg/hugo:ext serve) to run a local webserver which builds whenever a file change is detected. If watching doesn't appear to be working for you, try adding --disableFastRender to the commandline.

  5. Edit the specification 🙂

We use a highly customized Docsy theme for our generated site, which uses Bootstrap and Font Awesome. If you're looking at making design-related changes to the spec site, please coordinate with us in #matrix-docs:matrix.org before opening a PR.

Building the specification

If for some reason you're not a CI/CD system and want to render a static version of the spec for yourself, follow the above steps for authoring changes to the specification and instead of hugo serve run hugo -d "spec" - this will generate the spec to /spec. If you'd like to serve the spec off a path instead of a domain root (eg: /unstable), add --baseURL "/unstable" to the hugo -d "spec" command.

For building the OpenAPI definitions, create a python3 virtualenv and activate it. Then run pip install -r ./scripts/requirements.txt and finally python ./scripts/dump-openapi.py to generate it to ./scripts/openapi/api-docs.json. To make use of the generated file, there are a number of options:

  • You can open ./scripts/openapi-preview.html in your browser, and then open the file by clicking on Local JSON File.
  • You can run a local HTTP server by running ./scripts/openapi-http-server.py, and then view the documentation by opening ./scripts/openapi-preview.html in your browser.

Issue tracking

Specification issues are tracked on github at https://github.com/matrix-org/matrix-spec/issues.

See meta/github-labels.rst for information on what the labels mean.