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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 { StreamSession, VoiceState } from "@spacebar/database";
import { CLOSECODES } from "@spacebar/gateway";
import { validateSchema, VoiceIdentifySchema } from "@spacebar/schemas";
import { generateSsrc, mediaServer, Send, VoiceOPCodes, VoicePayload, WebRtcWebSocket } from "@spacebar/webrtc";
import { SSRCs } from "@spacebarchat/spacebar-webrtc-types";
import { subscribeToProducers } from "./Video";
export async function onIdentify(this: WebRtcWebSocket, data: VoicePayload) {
clearTimeout(this.readyTimeout);
// noinspection JSUnusedLocalSymbols - TODO: use video?
const { server_id, user_id, session_id, token, streams, video } = validateSchema("VoiceIdentifySchema", data.d) as VoiceIdentifySchema;
// server_id can be one of the following: a unique id for a GO Live stream, a channel id for a DM voice call, or a guild id for a guild voice channel
// not sure if there's a way to determine whether a snowflake is a channel id or a guild id without checking if it exists in db
// luckily we will only have to determine this once
let type: "guild-voice" | "dm-voice" | "stream" = "guild-voice";
let authenticated = false;
// first check if its a guild voice connection or DM voice call
const voiceState = await VoiceState.findOne({
where: [
{ guild_id: server_id, user_id, token, session_id },
{ channel_id: server_id, user_id, token, session_id },
],
});
if (voiceState) {
type = voiceState.guild_id === server_id ? "guild-voice" : "dm-voice";
authenticated = true;
} else {
// if its not a guild/dm voice connection, check if it is a go live stream
const streamSession = await StreamSession.findOne({
where: {
stream_id: server_id,
user_id,
token,
session_id,
used: false,
},
relations: { stream: true },
});
if (streamSession) {
type = "stream";
authenticated = true;
streamSession.used = true;
await streamSession.save();
this.once("close", async () => {
await streamSession.remove();
});
}
}
// if it doesnt match any then not valid token
if (!authenticated) return this.close(CLOSECODES.Authentication_failed);
this.user_id = user_id;
this.session_id = session_id;
this.type = type;
const voiceRoomId = type === "stream" ? server_id : voiceState!.channel_id;
try {
this.webRtcClient = await mediaServer.join(voiceRoomId, this.user_id, this, type!);
} catch (e) {
return this.close(4013);
}
this.on("close", () => {
// ice-lite media server relies on this to know when the peer went away
mediaServer.onClientClose(this.webRtcClient!);
});
// once connected subscribe to tracks from other users
this.webRtcClient.emitter.once("connected", async () => {
await subscribeToProducers.call(this);
});
// the server generates a unique ssrc for the audio and video stream. Must be unique among users connected to same server
// UDP clients will respect this ssrc, but webrtc clients will generate and replace it with their own
const generatedSsrc: SSRCs = {
audio_ssrc: generateSsrc(),
video_ssrc: generateSsrc(),
rtx_ssrc: generateSsrc(),
};
this.webRtcClient.initIncomingSSRCs(generatedSsrc);
await Send(this, {
op: VoiceOPCodes.READY,
d: {
ssrc: generatedSsrc.audio_ssrc,
port: mediaServer.port,
modes: [
"aead_aes256_gcm_rtpsize",
"aead_aes256_gcm",
"aead_xchacha20_poly1305_rtpsize",
"xsalsa20_poly1305_lite_rtpsize",
"xsalsa20_poly1305_lite",
"xsalsa20_poly1305_suffix",
"xsalsa20_poly1305",
],
ip: mediaServer.ip,
experiments: [],
streams: streams?.map((x) => ({
...x,
ssrc: generatedSsrc.video_ssrc,
rtx_ssrc: generatedSsrc.rtx_ssrc,
type: "video", // client expects this to be overriden for some reason???
})),
},
});
}
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