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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, Send, WebSocket } from "@spacebar/gateway";
import { SelectProtocolSchema, validateSchema } from "@spacebar/util";
import { PublicIP, VoiceOPCodes, endpoint } from "@spacebar/webrtc";
import SemanticSDP, { MediaInfo, SDPInfo } from "semantic-sdp";
export async function onSelectProtocol(this: WebSocket, payload: Payload) {
if (!this.client) return;
const data = validateSchema(
"SelectProtocolSchema",
payload.d,
) as SelectProtocolSchema;
const offer = SemanticSDP.SDPInfo.parse("m=audio\n" + data.sdp!);
this.client.sdp!.setICE(offer.getICE());
this.client.sdp!.setDTLS(offer.getDTLS());
const transport = endpoint.createTransport(this.client.sdp!);
this.client.transport = transport;
transport.setRemoteProperties(this.client.sdp!);
transport.setLocalProperties(this.client.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];
const answer =
`m=audio ${port} ICE/SDP` +
`a=fingerprint:${fingerprint}` +
`c=IN IP4 ${PublicIP}` +
`a=rtcp:${port}` +
`a=ice-ufrag:${ice.getUfrag()}` +
`a=ice-pwd:${ice.getPwd()}` +
`a=fingerprint:${fingerprint}` +
`a=candidate:1 1 ${candidate.getTransport()} ${candidate.getFoundation()} ${candidate.getAddress()} ${candidate.getPort()} typ host`;
await Send(this, {
op: VoiceOPCodes.SESSION_DESCRIPTION,
d: {
video_codec: "H264",
sdp: answer,
media_session_id: this.session_id,
audio_codec: "opus",
},
});
}
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