66 lines
1.9 KiB
JavaScript
66 lines
1.9 KiB
JavaScript
(async () => {
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const globalConnnection = Symbol("grab-canvas-connection")
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const currentScriptSrc = document.currentScript.src;
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const sourceElt = document.querySelector("canvas,video");
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console.log("Grabbing", sourceElt)
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if(!sourceElt){
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console.error("No canvas found on this page")
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}
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const conn = new RTCPeerConnection({
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iceServers: [
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{urls: ["stun:stun.nextcloud.com:443"]}
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]
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});
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const iceCandidates = []
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conn.addEventListener("icecandidate", e => {
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iceCandidates.push(e.candidate)
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})
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const allCandidatesCollected = new Promise(res =>
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conn.addEventListener("icecandidate", e => e.candidate == null && res() ))
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let captureFn = sourceElt.captureStream;
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if(!captureFn){
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captureFn = sourceElt.mozCaptureStream;
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}
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if(sourceElt instanceof HTMLCanvasElement){
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captureFn = sourceElt.captureStream.bind(sourceElt)
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} else {
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if(sourceElt.mozCaptureStream){
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captureFn = sourceElt.mozCaptureStream.bind(sourceElt)
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} else {
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captureFn = sourceElt.captureStream.bind(sourceElt)
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}
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}
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const canvasStream = captureFn()
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const canvasStreamTracks = canvasStream.getVideoTracks()
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if(canvasStreamTracks.length > 0){
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conn.addTrack(canvasStreamTracks[0], canvasStream)
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} else {
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throw new Error("Element don't habe video track")
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}
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const offer = await conn.createOffer();
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await conn.setLocalDescription(offer);
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await allCandidatesCollected
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const res = await fetch(new URL("/_loled/grab-display", currentScriptSrc), {
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method: "POST",
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headers: { "content-type": "application/json" },
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body: JSON.stringify({
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offer,
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iceCandidates
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})
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})
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const response = new RTCSessionDescription(await res.json());
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conn.setRemoteDescription(response);
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window[globalConnnection] = conn
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})() |