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feat: add CreatorInCreateEvent to help with default room v11 #465

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Merged
kegsay merged 3 commits into from
May 6, 2026
Merged

feat: add CreatorInCreateEvent to help with default room v11 #465

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52795b0
feat: add CreatorInCreateEvent to help with default room v11
FrenchGithubUser Apr 17, 2026
529d3f0
feat: add strictEventByteLimits to help with default room v11
FrenchGithubUser Apr 20, 2026
3661833
chore: better document CreatorInCreateEvent
FrenchGithubUser Apr 30, 2026
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39 changes: 39 additions & 0 deletions eventversion.go
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Original file line number Diff line number Diff line change
Expand Up @@ -39,6 +39,14 @@ type IRoomVersion interface {
DomainlessRoomIDs() bool
PrivilegedCreators() bool
StateDAGs() bool
// returns true if this room version requires a "creator" field
// in the m.room.create event content (room versions 1–10). The field
// was removed in room version 11, where the creator is instead derived from
// the event sender.
CreatorInCreateEvent() bool
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FrenchGithubUser marked this conversation as resolved.
// StrictEventByteLimits returns true if this room version enforces field
// length limits in bytes rather than Unicode codepoints (introduced in v11 for synapse).
StrictEventByteLimits() bool
}

type KnownRoomVersionFunc func(RoomVersion) bool
Expand Down Expand Up @@ -110,6 +118,7 @@ var roomVersionMeta = map[RoomVersion]IRoomVersion{
checkKnockingAllowedFunc: disallowKnocking,
checkRestrictedJoinAllowedFunc: disallowRestrictedJoins,
checkCreateEvent: checkCreateEventV1,
creatorInCreateEvent: true,
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@reivilibre reivilibre Apr 28, 2026

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I think most of these should be false, if I understand it right?

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@FrenchGithubUser FrenchGithubUser Apr 30, 2026

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this is false from room v11 and above

newEventFromUntrustedJSONFunc: newEventFromUntrustedJSONV1,
newEventFromTrustedJSONFunc: newEventFromTrustedJSONV1,
newEventFromTrustedJSONWithEventIDFunc: newEventFromTrustedJSONWithEventIDV1,
Expand All @@ -130,6 +139,7 @@ var roomVersionMeta = map[RoomVersion]IRoomVersion{
checkKnockingAllowedFunc: disallowKnocking,
checkRestrictedJoinAllowedFunc: disallowRestrictedJoins,
checkCreateEvent: checkCreateEventV1,
creatorInCreateEvent: true,
newEventFromUntrustedJSONFunc: newEventFromUntrustedJSONV1,
newEventFromTrustedJSONFunc: newEventFromTrustedJSONV1,
newEventFromTrustedJSONWithEventIDFunc: newEventFromTrustedJSONWithEventIDV1,
Expand All @@ -150,6 +160,7 @@ var roomVersionMeta = map[RoomVersion]IRoomVersion{
checkKnockingAllowedFunc: disallowKnocking,
checkRestrictedJoinAllowedFunc: disallowRestrictedJoins,
checkCreateEvent: checkCreateEventV1,
creatorInCreateEvent: true,
newEventFromUntrustedJSONFunc: newEventFromUntrustedJSONV2,
newEventFromTrustedJSONFunc: newEventFromTrustedJSONV2,
newEventFromTrustedJSONWithEventIDFunc: newEventFromTrustedJSONWithEventIDV2,
Expand All @@ -170,6 +181,7 @@ var roomVersionMeta = map[RoomVersion]IRoomVersion{
checkKnockingAllowedFunc: disallowKnocking,
checkRestrictedJoinAllowedFunc: disallowRestrictedJoins,
checkCreateEvent: checkCreateEventV1,
creatorInCreateEvent: true,
newEventFromUntrustedJSONFunc: newEventFromUntrustedJSONV2,
newEventFromTrustedJSONFunc: newEventFromTrustedJSONV2,
newEventFromTrustedJSONWithEventIDFunc: newEventFromTrustedJSONWithEventIDV2,
Expand All @@ -190,6 +202,7 @@ var roomVersionMeta = map[RoomVersion]IRoomVersion{
checkKnockingAllowedFunc: disallowKnocking,
checkRestrictedJoinAllowedFunc: disallowRestrictedJoins,
checkCreateEvent: checkCreateEventV1,
creatorInCreateEvent: true,
newEventFromUntrustedJSONFunc: newEventFromUntrustedJSONV2,
newEventFromTrustedJSONFunc: newEventFromTrustedJSONV2,
newEventFromTrustedJSONWithEventIDFunc: newEventFromTrustedJSONWithEventIDV2,
Expand All @@ -210,6 +223,7 @@ var roomVersionMeta = map[RoomVersion]IRoomVersion{
checkKnockingAllowedFunc: disallowKnocking,
checkRestrictedJoinAllowedFunc: disallowRestrictedJoins,
checkCreateEvent: checkCreateEventV1,
creatorInCreateEvent: true,
newEventFromUntrustedJSONFunc: newEventFromUntrustedJSONV2,
newEventFromTrustedJSONFunc: newEventFromTrustedJSONV2,
newEventFromTrustedJSONWithEventIDFunc: newEventFromTrustedJSONWithEventIDV2,
Expand All @@ -230,6 +244,7 @@ var roomVersionMeta = map[RoomVersion]IRoomVersion{
checkKnockingAllowedFunc: checkKnocking,
checkRestrictedJoinAllowedFunc: disallowRestrictedJoins,
checkCreateEvent: checkCreateEventV1,
creatorInCreateEvent: true,
newEventFromUntrustedJSONFunc: newEventFromUntrustedJSONV2,
newEventFromTrustedJSONFunc: newEventFromTrustedJSONV2,
newEventFromTrustedJSONWithEventIDFunc: newEventFromTrustedJSONWithEventIDV2,
Expand All @@ -250,6 +265,7 @@ var roomVersionMeta = map[RoomVersion]IRoomVersion{
checkKnockingAllowedFunc: checkKnocking,
checkRestrictedJoinAllowedFunc: allowRestrictedJoins,
checkCreateEvent: checkCreateEventV1,
creatorInCreateEvent: true,
newEventFromUntrustedJSONFunc: newEventFromUntrustedJSONV2,
newEventFromTrustedJSONFunc: newEventFromTrustedJSONV2,
newEventFromTrustedJSONWithEventIDFunc: newEventFromTrustedJSONWithEventIDV2,
Expand All @@ -270,6 +286,7 @@ var roomVersionMeta = map[RoomVersion]IRoomVersion{
checkKnockingAllowedFunc: checkKnocking,
checkRestrictedJoinAllowedFunc: allowRestrictedJoins,
checkCreateEvent: checkCreateEventV1,
creatorInCreateEvent: true,
newEventFromUntrustedJSONFunc: newEventFromUntrustedJSONV2,
newEventFromTrustedJSONFunc: newEventFromTrustedJSONV2,
newEventFromTrustedJSONWithEventIDFunc: newEventFromTrustedJSONWithEventIDV2,
Expand All @@ -290,6 +307,7 @@ var roomVersionMeta = map[RoomVersion]IRoomVersion{
checkKnockingAllowedFunc: checkKnocking,
checkRestrictedJoinAllowedFunc: allowRestrictedJoins,
checkCreateEvent: checkCreateEventV1,
creatorInCreateEvent: true,
newEventFromUntrustedJSONFunc: newEventFromUntrustedJSONV2,
newEventFromTrustedJSONFunc: newEventFromTrustedJSONV2,
newEventFromTrustedJSONWithEventIDFunc: newEventFromTrustedJSONWithEventIDV2,
Expand All @@ -310,6 +328,7 @@ var roomVersionMeta = map[RoomVersion]IRoomVersion{
checkKnockingAllowedFunc: checkKnocking,
checkRestrictedJoinAllowedFunc: allowRestrictedJoins,
checkCreateEvent: checkCreateEventV2,
strictEventByteLimits: true,
newEventFromUntrustedJSONFunc: newEventFromUntrustedJSONV2,
newEventFromTrustedJSONFunc: newEventFromTrustedJSONV2,
newEventFromTrustedJSONWithEventIDFunc: newEventFromTrustedJSONWithEventIDV2,
Expand All @@ -330,6 +349,7 @@ var roomVersionMeta = map[RoomVersion]IRoomVersion{
checkKnockingAllowedFunc: checkKnocking,
checkRestrictedJoinAllowedFunc: allowRestrictedJoins,
checkCreateEvent: checkCreateEventV3,
strictEventByteLimits: true,
// v3 versions relax the room ID check as the room ID has no domain now.
newEventFromUntrustedJSONFunc: newEventFromUntrustedJSONV3,
newEventFromTrustedJSONFunc: newEventFromTrustedJSONV3,
Expand All @@ -353,6 +373,7 @@ var roomVersionMeta = map[RoomVersion]IRoomVersion{
checkKnockingAllowedFunc: checkKnocking,
checkRestrictedJoinAllowedFunc: allowRestrictedJoins,
checkCreateEvent: checkCreateEventV1,
creatorInCreateEvent: true,
newEventFromUntrustedJSONFunc: newEventFromUntrustedJSONV2,
newEventFromTrustedJSONFunc: newEventFromTrustedJSONV2,
newEventFromTrustedJSONWithEventIDFunc: newEventFromTrustedJSONWithEventIDV2,
Expand All @@ -373,6 +394,7 @@ var roomVersionMeta = map[RoomVersion]IRoomVersion{
checkKnockingAllowedFunc: checkKnocking,
checkRestrictedJoinAllowedFunc: disallowRestrictedJoins,
checkCreateEvent: checkCreateEventV1,
creatorInCreateEvent: true,
newEventFromUntrustedJSONFunc: newEventFromUntrustedJSONV2,
newEventFromTrustedJSONFunc: newEventFromTrustedJSONV2,
newEventFromTrustedJSONWithEventIDFunc: newEventFromTrustedJSONWithEventIDV2,
Expand All @@ -392,6 +414,7 @@ var roomVersionMeta = map[RoomVersion]IRoomVersion{
parsePowerLevelsFunc: parsePowerLevels,
checkKnockingAllowedFunc: checkKnocking,
checkCreateEvent: checkCreateEventV1,
creatorInCreateEvent: true,
newEventFromUntrustedJSONFunc: newEventFromUntrustedJSONV2,
newEventFromTrustedJSONFunc: newEventFromTrustedJSONV2,
newEventFromTrustedJSONWithEventIDFunc: newEventFromTrustedJSONWithEventIDV2,
Expand Down Expand Up @@ -436,6 +459,7 @@ var roomVersionMeta = map[RoomVersion]IRoomVersion{
checkKnockingAllowedFunc: checkKnocking,
checkRestrictedJoinAllowedFunc: allowRestrictedJoins,
checkCreateEvent: checkCreateEventV3,
strictEventByteLimits: true,
// v3 versions relax the room ID check as the room ID has no domain now.
newEventFromUntrustedJSONFunc: newEventFromUntrustedJSONV3,
newEventFromTrustedJSONFunc: newEventFromTrustedJSONV3,
Expand Down Expand Up @@ -529,6 +553,13 @@ type RoomVersionImpl struct {
domainlessRoomID bool
// creators have infinite PL
privilegedCreators bool
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// the m.room.create content includes a "creator" field
// (room versions 1–10). This is distinct from privilegedCreators, which
// governs power-levels; this flag only controls whether the field
// must be present in the create event content.
creatorInCreateEvent bool
// field length limits are in bytes rather than Unicode codepoints
strictEventByteLimits bool
// Events form two graphs, a state DAG and an event DAG.
stateDAGs bool
checkRestrictedJoin func(ctx context.Context, localServerName spec.ServerName, roomQuerier RestrictedRoomJoinQuerier, roomID spec.RoomID, senderID spec.SenderID, privilegedCreators bool) (string, error)
Expand Down Expand Up @@ -562,6 +593,14 @@ func (v RoomVersionImpl) PrivilegedCreators() bool {
return v.privilegedCreators
}

func (v RoomVersionImpl) CreatorInCreateEvent() bool {
return v.creatorInCreateEvent
}

func (v RoomVersionImpl) StrictEventByteLimits() bool {
return v.strictEventByteLimits
}

// StateResAlgorithm returns the state resolution for the given room version.
func (v RoomVersionImpl) StateResAlgorithm() StateResAlgorithm {
return v.stateResAlgorithm
Expand Down
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