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import { send } from "../channel/connection";
export enum TransferType {
OFFER,
ANSWER,
}
export type Transfer = {
pc: RTCPeerConnection;
channel: RTCDataChannel;
type: TransferType;
};
export async function offer(request_token: string): Promise<Transfer> {
const transfer = createTransfer(TransferType.OFFER);
const offer = await transfer.pc.createOffer();
transfer.pc.setLocalDescription(offer);
// TODO: Start waiting for remote answer
send("accept_request", {
request: request_token,
sdp: offer.sdp,
type: offer.type,
});
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);
send("accept_share", {
sdp: offer.sdp,
type: offer.type,
});
return transfer;
}
function createTransfer(type: TransferType): Transfer {
const pc = new RTCPeerConnection(null);
const channel = pc.createDataChannel("channel", {
negotiated: true,
id: 0,
});
return {
pc,
channel,
type,
};
}
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