Implement shared Factorio credentials

Add config entries to controller and host for the Factorio username and
token to use when talking to the Factorio APIs.  If set an username and
token is not set in factorio.settings then these settings are used,
making it easy to configure one set of credentials for a cluster/host.

For running more public provide your own hardware clusters, there's an
option to disable controller sharing the credential with the hosts so
that each host have to set their own credentials.

packages/controller/src/Controller.ts

@@ -788,8 +788,6 @@ export default class Controller {
 			"tags": ["clusterio"],
 			"max_players": 0,
 			"visibility": { "public": true, "lan": true },
-			"username": "",
-			"token": "",
 			"game_password": "",
 			"require_user_verification": true,
 			"max_upload_in_kilobytes_per_second": 0,

packages/controller/src/HostConnection.ts

@@ -74,6 +74,7 @@ export default class HostConnection extends BaseConnection {
 			this._controller.hosts.set(this.info);
 		});
 
+		this.handle(lib.GetFactorioCredentialsRequest, this.handleGetFactorioCredentialsRequest.bind(this));
 		this.handle(lib.HostInfoUpdateEvent, this.handleHostInfoUpdateEvent.bind(this));
 		this.handle(lib.InstanceStatusChangedEvent, this.handleInstanceStatusChangedEvent.bind(this));
 		this.handle(lib.InstancesUpdateRequest, this.handleInstancesUpdateRequest.bind(this));
@@ -161,6 +162,16 @@ export default class HostConnection extends BaseConnection {
 		return this.info.remoteAddress;
 	}
 
+	async handleGetFactorioCredentialsRequest() {
+		if (this._controller.config.get("controller.share_factorio_credentials_with_hosts")) {
+			return {
+				username: this._controller.config.get("controller.factorio_username") ?? undefined,
+				token: this._controller.config.get("controller.factorio_token") ?? undefined,
+			};
+		}
+		return {};
+	}
+
 	async handleHostInfoUpdateEvent(event: lib.HostInfoUpdateEvent) {
 		this.info.name = event.update.name;
 		this.info.publicAddress = event.update.publicAddress;