From 9706eb1e19fa82e08a7429a7cfa0514402f9911d Mon Sep 17 00:00:00 2001
From: Travis Ralston <travisr@matrix.org>
Date: Fri, 31 Mar 2023 09:41:45 -0600
Subject: [PATCH] Fix auth rules again for power levels

See https://github.com/matrix-org/matrix-spec/pull/1479
---
 src/server/models/PowerLevels.ts                    | 8 ++++++--
 src/server/room_versions/impl/IDMimiLinearized00.ts | 2 +-
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/src/server/models/PowerLevels.ts b/src/server/models/PowerLevels.ts
index 0acd29c..258c374 100644
--- a/src/server/models/PowerLevels.ts
+++ b/src/server/models/PowerLevels.ts
@@ -3,9 +3,13 @@ import {MatrixEvent} from "./event";
 type PowerAction = "invite" | "kick" | "ban" | "redact" | "notifications.room";
 
 export class PowerLevels {
-    public constructor(private event: MatrixEvent | undefined) {}
+    public constructor(private event: MatrixEvent | undefined, private createEvent: MatrixEvent) {}
 
     public getUserLevel(userId: string): number {
+        if (this.event === undefined) {
+            return userId === this.createEvent.sender ? 100 : 0;
+        }
+
         const explicitLevel = this.event?.content["users"]?.[userId];
         if (Number.isInteger(explicitLevel)) {
             return explicitLevel;
@@ -42,7 +46,7 @@ export class PowerLevels {
     }
 
     public canUserSend(userId: string, eventType: string, isState: boolean): boolean {
-        let requiredLevel = isState ? (this.event ? 50 : 0) : 0;
+        let requiredLevel = isState ? 50 : 0;
 
         const defaultLevel = isState ? this.event?.content["state_default"] : this.event?.content["events_default"];
         if (Number.isInteger(defaultLevel)) {
diff --git a/src/server/room_versions/impl/IDMimiLinearized00.ts b/src/server/room_versions/impl/IDMimiLinearized00.ts
index a568a4e..32a91a9 100644
--- a/src/server/room_versions/impl/IDMimiLinearized00.ts
+++ b/src/server/room_versions/impl/IDMimiLinearized00.ts
@@ -280,7 +280,7 @@ export class IDMimiLinearized00 implements RoomVersion {
         const joinRule = joinRulesEv?.content["join_rule"] ?? "invite";
 
         const powerLevelsEv = currentState.get("m.room.power_levels", "");
-        const powerLevels = new PowerLevels(powerLevelsEv);
+        const powerLevels = new PowerLevels(powerLevelsEv, createEvent);
 
         const senderMembershipEv = currentState.get("m.room.member", event.sender);
         const senderMembership = senderMembershipEv?.content["membership"] ?? "leave";