chore: default room version back to 10 but configurable

[sampaiodiego]

CORE-2737

PersistentEventFactory.defaultRoomVersion was removed in favor of the value from config.service

Summary by CodeRabbit

• New Features
  • Added a configurable default room version, supporting versions 3 through 11 and defaulting to version 10.
  • New rooms, direct messages, and federation event requests now use the configured default when no room version is specified. Explicit versions supplied with federation requests remain unchanged.

[coderabbitai]

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Walkthrough

The federation SDK adds a configurable default room version for locally created rooms and federation request fallbacks. The event factory now requires callers to provide a room version.

Changes

Room Version Configuration

Layer / File(s)	Summary
Configure the default and require explicit factory versions packages/federation-sdk/src/services/config.service.ts, packages/room/src/manager/factory.ts	AppConfig accepts a supported optional default room version. ConfigService returns the configured version or '10'. PersistentEventFactory.newCreateEvent now requires a room version.
Apply the configured default to room creation packages/federation-sdk/src/sdk.ts, packages/federation-sdk/src/services/room.service.ts, packages/federation-sdk/src/services/invite.service.spec.ts, packages/federation-sdk/src/services/state.service.spec.ts	FederationSDK exposes the configured default, and room-creation methods pass it to the factory. Room-creation test fixtures now specify version '10'.
Use the configured default for federation requests packages/homeserver/src/controllers/internal/external-federation-request.controller.ts, packages/federation-sdk/src/services/room-version-coexistence.spec.ts	The event-template and event-send endpoints use the SDK default when the query version is absent or falsy. The coexistence test now checks event IDs from room versions 11 and 10.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Feature

Suggested labels: type: feature

Merge Risk: 🟡 Moderate · up to 2c628

When a request to send an event omits the room version, the endpoint always uses version 10 and ignores the configured default. Remove the fixed default before merging so the configured room version takes effect.

Security Architecture Review

Security architecture risk: 🟡 Moderate · up to 2c628

The new default is validated, but an internal event-template request can now select version 10 for an existing version-11 room unless its caller specifies the room’s version. That may disrupt version-dependent event processing. No attacker-accessible bypass was established.

Retained concerns

• Medium · security · inferred: The event-template endpoint now defaults to version 10 for requests without an explicit version, including requests concerning existing version-11 rooms. It constructs the event with that selected version rather than the room’s persisted version, risking incorrect version-dependent construction and processing. The endpoint’s internal scope and explicit-version override limit the established exposure; an authorization bypass is not established.

Security review details

Security Blast Radius

• inferred — The configured default can affect newly created rooms on an SDK instance and omitted-version calls to the changed internal endpoint. Existing rooms retain their own versions; independently attacker-controlled access to configuration or the internal endpoint was not established.

Security Findings and Attack Paths

• inferred — An internal template request without a version can now construct an event for a version-11 room using version-10 rules. State processing subsequently uses an event’s selected version for its store and authorization checks. This is a version-integrity concern, not a verified unauthorized-acceptance path; callers can specify the room version explicitly.

Trust Boundaries and Controls

• observed — The configured value crosses a schema-validation boundary before production storage. Internal endpoint callers can still supply an explicit version; the send endpoint checks whether it is supported, but that check does not compare it with the target room’s persisted version.

Resilience and Maintainability Implications

• observed — The inspected creation paths avoid a mid-operation version change by using the create event’s version for later events. For existing rooms, StateService has a separate persisted-version lookup and can use it when buildEvent receives no version.

Hardening Proposals

• proposed — For operations on an existing room, derive or verify the version against its persisted create event instead of using the current creation default. Reconcile the send endpoint’s hard-coded query default with whichever omitted-version behavior is intended.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: restoring room version 10 as the default and making it configurable.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 8…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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🔧 Biome (2.5.12)

packages/federation-sdk/src/sdk.ts

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packages/federation-sdk/src/services/config.service.ts

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packages/federation-sdk/src/services/invite.service.spec.ts

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• 5 others

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Errors (1)

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 71.42857% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 53.41%. Comparing base (9e36970) to head (2c628cd).

Files with missing lines	Patch %	Lines
...ckages/federation-sdk/src/services/room.service.ts	33.33%	2 Missing ⚠️
packages/federation-sdk/src/sdk.ts	50.00%	1 Missing ⚠️
packages/room/src/manager/factory.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #413      +/-   ##
==========================================
- Coverage   53.59%   53.41%   -0.19%     
==========================================
  Files         112      112              
  Lines       12617    12628      +11     
==========================================
- Hits         6762     6745      -17     
- Misses       5855     5883      +28     

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[coderabbitai]

Actionable comments posted: 1

---

• 🪄 Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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Inline comments:
Review comments at
@packages/homeserver/src/controllers/internal/external-federation-request.controller.ts:
- Line 206: Update the `/internal/event/send` query schema so `version` is
optional and has no fixed default; preserve the existing fallback through
`federationSDK.getDefaultRoomVersion()` when `version` is omitted.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: 079c1ca3-954b-4652-92fb-dcd063ffdfaa

📥 Commits

Reviewing files that changed from the base of the PR and between 9e36970 and 2c628cd.

📒 Files selected for processing (8)

• packages/federation-sdk/src/sdk.ts
• packages/federation-sdk/src/services/config.service.ts
• packages/federation-sdk/src/services/invite.service.spec.ts
• packages/federation-sdk/src/services/room-version-coexistence.spec.ts
• packages/federation-sdk/src/services/room.service.ts
• packages/federation-sdk/src/services/state.service.spec.ts
• packages/homeserver/src/controllers/internal/external-federation-request.controller.ts
• packages/room/src/manager/factory.ts

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📜 Review details

⏰ Context from checks skipped due to timeout. (1)

• GitHub Check: Code Quality Checks(lint, test, tsc)

[cubic-dev-ai]

No issues found across 8 files

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