Fix gateway encoding Date objects as {} when using erlpack. Fixes NaN/NaN/NaN timestamps in desktop client

src/api/Server.ts

@@ -23,6 +23,7 @@ import {
 	Config,
 	initDatabase,
 	initEvent,
+	JSONReplacer,
 	Sentry,
 	WebAuthn,
 } from "@fosscord/util";
@@ -84,24 +85,7 @@ export class FosscordServer extends Server {
 			);
 		}
 
-		// Discord.com sends ISO strings with +00:00 extension, not Z
-		// This causes issues with Python bot libs
-		this.app.set(
-			"json replacer",
-			function (
-				this: { [key: string]: unknown },
-				key: string,
-				value: unknown,
-			) {
-				if (this[key] instanceof Date) {
-					return (this[key] as Date)
-						.toISOString()
-						.replace("Z", "+00:00");
-				}
-
-				return value;
-			},
-		);
+		this.app.set("json replacer", JSONReplacer);
 
 		this.app.use(CORS);
 		this.app.use(BodyParser({ inflate: true, limit: "10mb" }));

src/gateway/util/Send.ts

@@ -20,7 +20,7 @@ import { Payload, WebSocket } from "@fosscord/gateway";
 import fs from "fs/promises";
 import path from "path";
 
-import type { ErlpackType } from "@fosscord/util";
+import { ErlpackType, JSONReplacer } from "@fosscord/util";
 let erlpack: ErlpackType | null = null;
 try {
 	erlpack = require("erlpack") as ErlpackType;
@@ -28,6 +28,21 @@ try {
 	// empty
 }
 
+// don't care
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+const recurseJsonReplace = (json: any) => {
+	for (const key in json) {
+		// eslint-disable-next-line no-prototype-builtins
+		if (!json.hasOwnProperty(key)) continue;
+
+		json[key] = JSONReplacer.call(json, key, json[key]);
+
+		if (typeof json[key] == "object" && json[key] !== null)
+			json[key] = recurseJsonReplace(json[key]);
+	}
+	return json;
+};
+
 export function Send(socket: WebSocket, data: Payload) {
 	if (process.env.WS_VERBOSE)
 		console.log(`[Websocket] Outgoing message: ${JSON.stringify(data)}`);
@@ -47,9 +62,14 @@ export function Send(socket: WebSocket, data: Payload) {
 	}
 
 	let buffer: Buffer | string;
-	if (socket.encoding === "etf" && erlpack) buffer = erlpack.pack(data);
+	if (socket.encoding === "etf" && erlpack) {
+		// Erlpack doesn't like Date objects, encodes them as {}
+		data = recurseJsonReplace(data);
+		buffer = erlpack.pack(data);
+	}
 	// TODO: encode circular object
-	else if (socket.encoding === "json") buffer = JSON.stringify(data);
+	else if (socket.encoding === "json")
+		buffer = JSON.stringify(data, JSONReplacer);
 	else return;
 	// TODO: compression
 	if (socket.deflate) {

src/util/util/JSON.ts

@@ -0,0 +1,15 @@
+// Discord.com sends ISO strings with +00:00 extension, not Z
+// This causes issues with Python bot libs
+const JSONReplacer = function (
+	this: { [key: string]: unknown },
+	key: string,
+	value: unknown,
+) {
+	if (this[key] instanceof Date) {
+		return (this[key] as Date).toISOString().replace("Z", "+00:00");
+	}
+
+	return value;
+};
+
+export { JSONReplacer };

src/util/util/index.ts

@@ -40,3 +40,4 @@ export * from "./TraverseDirectory";
 export * from "./InvisibleCharacters";
 export * from "./Sentry";
 export * from "./WebAuthn";
+export * from "./JSON";