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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 * as Sentry from "@sentry/node";
import { CLOSECODES, OPCODES, Payload, WebSocket } from "@spacebar/gateway";
import { ErlpackType, PayloadSchema } from "@spacebar/util";
import fs from "fs/promises";
import BigIntJson from "json-bigint";
import path from "path";
import WS from "ws";
import OPCodeHandlers from "../opcodes";
import { check } from "../opcodes/instanceOf";
const bigIntJson = BigIntJson({ storeAsString: true });
let erlpack: ErlpackType | null = null;
try {
erlpack = require("erlpack") as ErlpackType;
} catch (e) {
// empty
}
export async function Message(this: WebSocket, buffer: WS.Data) {
// TODO: compression
let data: Payload;
if (
(buffer instanceof Buffer && buffer[0] === 123) || // ASCII 123 = `{`. Bad check for JSON
typeof buffer === "string"
) {
data = bigIntJson.parse(buffer.toString());
} else if (this.encoding === "json" && buffer instanceof Buffer) {
if (this.inflate) {
try {
buffer = this.inflate.process(buffer);
} catch {
buffer = buffer.toString();
}
}
data = bigIntJson.parse(buffer as string);
} else if (this.encoding === "etf" && buffer instanceof Buffer && erlpack) {
try {
data = erlpack.unpack(buffer);
} catch {
return this.close(CLOSECODES.Decode_error);
}
} else return this.close(CLOSECODES.Decode_error);
if (process.env.WS_VERBOSE)
console.log(`[Websocket] Incomming message: ${JSON.stringify(data)}`);
if (process.env.WS_DUMP) {
const id = this.session_id || "unknown";
await fs.mkdir(path.join("dump", id), { recursive: true });
await fs.writeFile(
path.join("dump", id, `${Date.now()}.in.json`),
JSON.stringify(data, null, 2),
);
if (!this.session_id)
console.log(
"[Gateway] Unknown session id, dumping to unknown folder",
);
}
check.call(this, PayloadSchema, data);
const OPCodeHandler = OPCodeHandlers[data.op];
if (!OPCodeHandler) {
console.error("[Gateway] Unkown opcode " + data.op);
// TODO: if all opcodes are implemented comment this out:
// this.close(CLOSECODES.Unknown_opcode);
return;
}
try {
return await Sentry.startActiveSpan(
{
op: "websocket.server",
name: `GATEWAY ${OPCODES[data.op]}`,
data: {
...data.d,
token: data?.d?.token ? "[Redacted]" : undefined,
},
},
async () => {
const ret = await OPCodeHandler.call(this, data);
Sentry.setUser({ id: this.user_id });
return ret;
},
);
} catch (error) {
Sentry.captureException(error, {
user: {
id: this.user_id,
},
});
console.error(`Error: Op ${data.op}`, error);
// if (!this.CLOSED && this.CLOSING)
return this.close(CLOSECODES.Unknown_error);
}
}
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