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fix(pdu): Exempt m.room.create from auth_events check #1987

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nex merged 1 commit from eleboucher/continuwuity:fix/pdu-room-create into main 2026-07-14 17:38:35 +00:00
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eleboucher commented 2026-07-14 17:20:27 +00:00
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This pull request exempts the m.room.create event from the PDU validation checks that mandate or forbid referencing a room creation event within auth_events.

During incoming federation invites, the homeserver validates the incoming stripped state events, which includes the room's m.room.create event. Because the creation event is the absolute genesis event of a room, its auth_events list is empty by definition.

Previously, the codebase applied the room version rules strictly to every single event. This created a logical paradox for the creation event, causing federation invites to fail with a 400 MINVALIDPARAM error: BadJson: PDU does not reference the room create event.

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<!-- In order to help reviewers know what your pull request does at a glance, you should ensure that 1. Your PR title is a short, single sentence describing what you changed 2. You have described in more detail what you have changed, why you have changed it, what the intended effect is, and why you think this will be beneficial to the project. If you have made any potentially strange/questionable design choices, but didn't feel they'd benefit from code comments, please don't mention them here - after opening your pull request, go to "files changed", and click on the "+" symbol in the line number gutter, and attach comments to the lines that you think would benefit from some clarification. --> This pull request exempts the m.room.create event from the PDU validation checks that mandate or forbid referencing a room creation event within auth_events. During incoming federation invites, the homeserver validates the incoming stripped state events, which includes the room's m.room.create event. Because the creation event is the absolute genesis event of a room, its auth_events list is empty by definition. Previously, the codebase applied the room version rules strictly to every single event. This created a logical paradox for the creation event, causing federation invites to fail with a 400 MINVALIDPARAM error: BadJson: PDU does not reference the room create event. <!-- Example: This pull request allows us to warp through time and space ten times faster than before by double-inverting the warp drive with hyperheated jump fluid, both making the drive faster and more efficient. 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fix(pdu): Exempt m.room.create from auth_events check
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nex requested changes 2026-07-14 17:22:56 +00:00
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nex left a comment
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Good catch, I forgot this can happen

Good catch, I forgot this can happen
src/service/rooms/event_handler/pdu_checks.rs Outdated
@ -50,0 +51,4 @@
.get("state_key")
.and_then(CanonicalJsonValue::as_str);
let is_create_event = event_type == Some("m.room.create") && state_key == Some("");
nex commented 2026-07-14 17:22:42 +00:00
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type is an expected field, so if it's None, BadJson("PDU is missing a type") should be returned, rather than allowing it to be null

`type` is an expected field, so if it's None, `BadJson("PDU is missing a type")` should be returned, rather than allowing it to be null
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eleboucher commented 2026-07-14 17:23:02 +00:00
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tested with a friend facing the problem when join a space and after the fix we could invite him fine

tested with a friend facing the problem when join a space and after the fix we could invite him fine
eleboucher force-pushed fix/pdu-room-create from 28c06b9c37
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eleboucher force-pushed fix/pdu-room-create from 2eba389747
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nex approved these changes 2026-07-14 17:30:10 +00:00
nex scheduled this pull request to auto merge when all checks succeed 2026-07-14 17:31:13 +00:00
ginger added this to the 26.7.0 milestone 2026-07-14 17:33:20 +00:00
nex merged commit 7ecd2aa5e2 into main 2026-07-14 17:38:35 +00:00
nex deleted branch fix/pdu-room-create 2026-07-14 17:38:35 +00:00
s1lv3r reviewed 2026-07-14 17:40:53 +00:00
CONTRIBUTING.md
@ -28,3 +28,3 @@
```bash
# Install prek using cargo-binstall
cargo binstall prek
cargo install prek
s1lv3r commented 2026-07-14 17:40:53 +00:00
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Ok so i know its merged already, but this seems wrong? Comment says "install with binstall", but this changes it to install?

Ok so i know its merged already, but this seems wrong? Comment says "install with binstall", but this changes it to `install`?
nex commented 2026-07-14 17:41:32 +00:00
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idk I used install myself, idk what binstall even is

idk I used `install` myself, idk what `binstall` even is
s1lv3r commented 2026-07-14 17:42:27 +00:00
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Binstall provides a low-complexity mechanism for installing Rust binaries as an alternative to building from source (via cargo install) or manually downloading packages. This is intended to work with existing CI artifacts and infrastructure, and with minimal overhead for package maintainers.

Binstall works by fetching the crate information from crates.io and searching the linked repository for matching releases and artifacts, falling back to the quickinstall third-party artifact host, to alternate targets as supported, and finally to cargo install as a last resort.

Binary install i guess

> Binstall provides a low-complexity mechanism for installing Rust binaries as an alternative to building from source (via cargo install) or manually downloading packages. This is intended to work with existing CI artifacts and infrastructure, and with minimal overhead for package maintainers. > > Binstall works by fetching the crate information from crates.io and searching the linked repository for matching releases and artifacts, falling back to the quickinstall third-party artifact host, to alternate targets as supported, and finally to cargo install as a last resort. Binary install i guess
eleboucher commented 2026-07-14 17:43:22 +00:00
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it's actually a deps https://github.com/cargo-bins/cargo-binstall my bad i didn't read above

it's actually a deps https://github.com/cargo-bins/cargo-binstall my bad i didn't read above
eleboucher commented 2026-07-14 17:43:32 +00:00
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will fix it there #1988

will fix it there https://forgejo.ellis.link/continuwuation/continuwuity/pulls/1988
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