fix: add stripped events validation on invite processing

Author: ricardogarim

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

@@ -149,16 +149,24 @@ export class InviteService {
 	}
 
 	private async shouldProcessInvite(
-		strippedStateEvents: PduForType<
-			| 'm.room.create'
-			| 'm.room.name'
-			| 'm.room.avatar'
-			| 'm.room.topic'
-			| 'm.room.join_rules'
-			| 'm.room.canonical_alias'
-			| 'm.room.encryption'
-		>[],
+		strippedStateEvents:
+			| PduForType<
+					| 'm.room.create'
+					| 'm.room.name'
+					| 'm.room.avatar'
+					| 'm.room.topic'
+					| 'm.room.join_rules'
+					| 'm.room.canonical_alias'
+					| 'm.room.encryption'
+			  >[]
+			| undefined,
 	): Promise<void> {
+		if (!strippedStateEvents || strippedStateEvents.length === 0) {
+			throw new Error(
+				'Missing invite_room_state required for policy validation',
+			);
+		}
+
 		const isRoomNonPrivate = strippedStateEvents.some(
 			(stateEvent) =>
 				stateEvent.type === 'm.room.join_rules' &&
@@ -188,7 +196,7 @@ export class InviteService {
 		roomVersion: RoomVersion,
 	): Promise<PersistentEventBase<RoomVersion, 'm.room.member'>> {
 		// SPEC: when a user invites another user on a different homeserver, a request to that homeserver to have the event signed and verified must be made
-		await this.shouldProcessInvite(event.unsigned.invite_room_state);
+		await this.shouldProcessInvite(event.unsigned?.invite_room_state);
 
 		const inviteEvent =
 			PersistentEventFactory.createFromRawEvent<'m.room.member'>(