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/*
Fosscord: A FOSS re-implementation and extension of the Discord.com backend.
Copyright (C) 2023 Fosscord and Fosscord 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, Send, WebSocket } from "@fosscord/gateway";
import { SelectProtocolSchema, validateSchema } from "@fosscord/util";
import { endpoint, PublicIP, VoiceOPCodes } from "@fosscord/webrtc";
import MediaServer from "medooze-media-server";
import SemanticSDP, { MediaInfo } from "semantic-sdp";
import DefaultSDP from "./sdp.json";
export async function onSelectProtocol(this: WebSocket, payload: Payload) {
if (!this.webrtcClient) return;
const data = validateSchema(
"SelectProtocolSchema",
payload.d,
) as SelectProtocolSchema;
const offer = SemanticSDP.SDPInfo.parse("m=audio\n" + data.sdp);
// eslint-disable-next-line @typescript-eslint/ban-ts-comment
//@ts-ignore
offer.getMedias()[0].type = "audio"; // this is bad, but answer.toString() fails otherwise
this.webrtcClient.sdp.setICE(offer.getICE());
this.webrtcClient.sdp.setDTLS(offer.getDTLS());
const transport = endpoint.createTransport(this.webrtcClient.sdp);
this.webrtcClient.transport = transport;
transport.setRemoteProperties(this.webrtcClient.sdp);
transport.setLocalProperties(this.webrtcClient.sdp);
const dtls = transport.getLocalDTLSInfo();
const ice = transport.getLocalICEInfo();
const port = endpoint.getLocalPort();
const fingerprint = dtls.getHash() + " " + dtls.getFingerprint();
const candidates = transport.getLocalCandidates();
const candidate = candidates[0];
// discord answer
/*
m=audio 50026 ICE/SDP\n
a=fingerprint:sha-256 4A:79:94:16:44:3F:BD:05:41:5A:C7:20:F3:12:54:70:00:73:5D:33:00:2D:2C:80:9B:39:E1:9F:2D:A7:49:87\n
c=IN IP4 66.22.206.174\n
a=rtcp:50026\n
a=ice-ufrag:XxnE\n
a=ice-pwd:GLQatPT3Q9dCZVVgVf3J1F\n
a=fingerprint:sha-256 4A:79:94:16:44:3F:BD:05:41:5A:C7:20:F3:12:54:70:00:73:5D:33:00:2D:2C:80:9B:39:E1:9F:2D:A7:49:87\n
a=candidate:1 1 UDP 4261412862 66.22.206.174 50026 typ host\n
*/
const answer =
`m=audio ${port} ICE/SDP\n` +
`a=fingerprint:${fingerprint}\n` +
`c=IN IP4 ${PublicIP}\n` +
`a=rtcp:${port}\n` +
`a=ice-ufrag:${ice.getUfrag()}\n` +
`a=ice-pwd:${ice.getPwd()}\n` +
`a=fingerprint:${fingerprint}\n` +
`a=candidate:1 1 ${candidate.getTransport()} ${candidate.getFoundation()} ${candidate.getAddress()} ${candidate.getPort()} typ host\n`;
await Send(this, {
op: VoiceOPCodes.SELECT_PROTOCOL_ACK,
d: {
video_codec: "H264",
sdp: answer.toString(),
media_session_id: this.session_id,
audio_codec: "opus",
},
});
}
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