feat(server): use nestjs events to validate config (#7986)

* use events for config validation

* chore: better types

* add unit tests

---------

Co-authored-by: Jason Rasmussen <jrasm91@gmail.com>

server/src/domain/repositories/communication.repository.ts

@@ -1,4 +1,5 @@
 import { AssetResponseDto, ReleaseNotification, ServerVersionResponseDto } from '@app/domain';
+import { SystemConfig } from '@app/infra/entities';
 
 export const ICommunicationRepository = 'ICommunicationRepository';
 
@@ -21,6 +22,14 @@ export enum ServerEvent {
   CONFIG_UPDATE = 'config:update',
 }
 
+export enum InternalEvent {
+  VALIDATE_CONFIG = 'validate_config',
+}
+
+export interface InternalEventMap {
+  [InternalEvent.VALIDATE_CONFIG]: { newConfig: SystemConfig; oldConfig: SystemConfig };
+}
+
 export interface ClientEventMap {
   [ClientEvent.UPLOAD_SUCCESS]: AssetResponseDto;
   [ClientEvent.USER_DELETE]: string;
@@ -45,4 +54,6 @@ export interface ICommunicationRepository {
   on(event: 'connect', callback: OnConnectCallback): void;
   on(event: ServerEvent, callback: OnServerEventCallback): void;
   sendServerEvent(event: ServerEvent): void;
+  emit<E extends keyof InternalEventMap>(event: E, data: InternalEventMap[E]): boolean;
+  emitAsync<E extends keyof InternalEventMap>(event: E, data: InternalEventMap[E]): Promise<any>;
 }