Support Matrix 1.15

[turt2live]

Matrix Specification v1.15 Changelog

Prior: #18531
Source: https://spec.matrix.org/v1.15/changelog/v1.15/checklist.md

Git commit	https://github.com/matrix-org/matrix-spec/tree/v1.15
Release date	June 26, 2025

Client-Server API

New Endpoints

• Add GET /_matrix/client/v1/room_summary/{roomIdOrAlias}, as per MSC3266. (#2125)
• Add GET /_matrix/client/v1/auth_metadata, as per MSC2965. (#2147)

Backwards Compatible Changes

• Add m.topic content block to enable rich text in m.room.topic events as per MSC3765. (#2095)
• Include device keys with Olm-encrypted events as per MSC4147. (#2122)
• Add /_matrix/client/v1/room_summary/{roomIdOrAlias} and extend /_matrix/client/v1/rooms/{roomId}/hierarchy with the new optional properties allowed_room_ids, encryption and room_version as per MSC3266. (#2125, #2158)
• Add the OAuth 2.0 based authentication API, as per MSC3861 and its sub-proposals. (#2141, #2148, #2149, #2150, #2151, #2159, #2164)

Spec Clarifications

• Clarify behaviour when the topic key of a m.room.topic event is absent, null, or empty. (#2068)
• Fix the example of the GET /sync endpoint and the m.room.member example used in several places. (#2077)
• Clarify the format of third-party invites, including the fact that identity server public keys can be encoded using standard or URL-safe base64. (#2083)
• "Public" rooms in profile look-ups are defined through their join rule and history visibility. (#2101)
• "Public" rooms in user directory queries are defined through their join rule and history visibility. (#2102)
• Rooms published in /publicRooms don't necessarily have public join rules or world_readable history visibility. (#2104)
• "Public" rooms with respect to call invites are defined through their join rule. (#2106)
• "Public" rooms have no specific meaning with respect to moderation policy lists. (#2107)
• "Public" rooms with respect to presence are defined through their join rule. (#2108)
• Spaces are subject to the same access mechanisms as rooms. (#2109)
• Fix various typos throughout the specification. (#2121, #2144)
• Clarify that Well-Known URIs are available on the server name's hostname. Contributed by @HarHarLinks. (#2140)
• Add missing fields in example for ExportedSessionData. (#2154)

Server-Server API

Backwards Compatible Changes

• Add m.topic content block to enable rich text in m.room.topic events as per MSC3765. (#2095)
• Extend /_matrix/federation/v1/hierarchy/{roomId} with the new optional properties encryption and room_version as per MSC3266. (#2125) -> Unprefix room_version & encryption from hierarchy API #19576

Spec Clarifications

• Add a note to the invite endpoints that invites to local users may be received twice over federation if the homeserver is already in the room. (#2067)
• Clarify the format of third-party invites, including the fact that identity server public keys can be encoded using standard or URL-safe base64. (#2083)
• Clarify that auth event of content.join_authorised_via_users_server is only necessary for m.room.member with a membership of join. (#2100)
• Rooms published in /publicRooms don't necessarily have public join rules or world_readable history visibility. (#2104)
• Fix various typos throughout the specification. (#2128)
• Clarify that Well-Known URIs are available on the server name's hostname. Contributed by @HarHarLinks. (#2140)

Application Service API

Spec Clarifications

• Clarify in the application service registration schema the url: null behaviour. (#2130)

Identity Service API

Spec Clarifications

• Clarify that public keys can be encoded using standard or URL-safe base64. (#2083)

Push Gateway API

No significant changes.

Room Versions

No significant changes.

Appendices

No significant changes.

Internal Changes/Tooling

Spec Clarifications

• Adjust margins in rendered endpoints. (#2081)
• Replace Hugo shortcodes in OpenAPI output. (#2088)
• Add well-known funding manifest urls to spec to authorise https://matrix.org/funding.json. Contributed by @HarHarLinks. (#2115)
• Fix the historical info box when generating the historical spec in CI. (#2123)
• Update the header navigation menu with links to modern matrix.org. Contributed by @HarHarLinks. (#2137)

[Johennes]

• Add m.topic content block to enable rich text in m.room.topic events as per MSC3765. (#2095)

This happened in #18195 which landed only after the MSC and used stable identifiers directly.

(The entry occurs under both the Client-Server API and the Server-Server API section.)

[hughns]

Should #18923 be resolved as part of declaring 1.15 support?