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/*
Spacebar: A FOSS re-implementation and extension of the Discord.com backend.
Copyright (C) 2023 Spacebar and Spacebar Contributors
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
import { Payload, WebSocket } from "@spacebar/gateway";
import fs from "fs/promises";
import path from "path";
import { ErlpackType, JSONReplacer } from "@spacebar/util";
let erlpack: ErlpackType | null = null;
try {
erlpack = require("erlpack") as ErlpackType;
} catch (e) {
// 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: ${JSON.stringify(data)}`);
if (process.env.WS_DUMP) {
const id = socket.session_id || "unknown";
(async () => {
await fs.mkdir(path.join("dump", id), {
recursive: true,
});
await fs.writeFile(
path.join("dump", id, `${Date.now()}.out.json`),
JSON.stringify(data, null, 2),
);
})();
}
let buffer: Buffer | string;
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, JSONReplacer);
else return;
// TODO: compression
if (socket.deflate) {
buffer = socket.deflate.process(buffer) as Buffer;
}
return new Promise((res, rej) => {
if (socket.readyState !== 1) {
// return rej("socket not open");
socket.close();
return;
}
socket.send(buffer, (err) => {
if (err) return rej(err);
return res(null);
});
});
}
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