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import { onWithToken, send } from "../channel/connection";
import type { UnregisterHandler } from "../channel/messages/handler";
import type {
ShareAcceptedMessage,
RequestIceCandidateMessage,
ShareIceCandidateMessage,
} from "../channel/messages/messages";
export enum TransferType {
OFFER,
ANSWER,
}
export type Transfer = {
pc: RTCPeerConnection;
channel: RTCDataChannel;
type: TransferType;
};
const servers = {
iceServers: [
{
urls: [
"stun:stun1.l.google.com:19302",
"stun:stun2.l.google.com:19302",
],
},
],
iceCandidatePoolSize: 10,
};
export async function offer(request_token: string): Promise<Transfer> {
const transfer = createTransfer(TransferType.OFFER);
const offer = await transfer.pc.createOffer();
transfer.pc.setLocalDescription(offer);
transfer.pc.onicecandidate = event => {
const candidate = event.candidate;
if (event.candidate !== null) {
send("ice_candidate", { candidate, token: request_token });
}
};
send("accept_request", {
token: request_token,
sdp: offer.sdp,
type: offer.type,
});
onWithToken(
"share_accepted",
request_token,
(message: ShareAcceptedMessage, unregister) =>
onShareAccepted(transfer, message, unregister)
);
return transfer;
}
export async function answer(
offer: RTCSessionDescriptionInit
): Promise<Transfer> {
const transfer = createTransfer(TransferType.ANSWER);
const offerDescription = new RTCSessionDescription(offer);
transfer.pc.setRemoteDescription(offerDescription);
const answer = await transfer.pc.createAnswer();
transfer.pc.setLocalDescription(answer);
transfer.pc.onicecandidate = event => {
const candidate = event.candidate;
if (event.candidate !== null) {
send("ice_candidate", { candidate });
}
};
send("accept_share", {
sdp: offer.sdp,
type: offer.type,
});
return transfer;
}
function createTransfer(type: TransferType): Transfer {
const pc = new RTCPeerConnection(servers);
const channel = pc.createDataChannel("channel", {
negotiated: true,
id: 0,
});
channel.onopen = e => console.log("ooooyeeee");
return {
pc,
channel,
type,
};
}
function onShareAccepted(
transfer: Transfer,
message: ShareAcceptedMessage,
unregister: UnregisterHandler
) {
const token = message.token;
transfer.pc.setRemoteDescription(message);
const unregisterIce = onWithToken(
"ice_candidate",
token,
(message: RequestIceCandidateMessage) =>
onIncomingIceCandidate(transfer, message)
);
transfer.pc.onicegatheringstatechange = event => {
const connection = event.target as any;
console.log(connection.iceGatheringState);
if (connection.iceGatheringState === "complete") {
unregisterIce();
}
};
unregister();
}
function onIncomingIceCandidate(
transfer: Transfer,
message: ShareIceCandidateMessage | RequestIceCandidateMessage
) {
transfer.pc.addIceCandidate(message.candidate);
}
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