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mb nostr #60

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acdc433
Add nostr latest posts
tekknolagi Feb 7, 2024
f50ca09
Remove spurious log
tekknolagi Feb 7, 2024
142b6e2
webrtc
tekknolagi Feb 7, 2024
15ac530
wip
tekknolagi Feb 7, 2024
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78 changes: 78 additions & 0 deletions index.md
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,84 @@ internship for Summer of 2024.**
You can [email me](mailto:[email protected]) if you so desire. I'm
happy to talk about education, programming languages, cycling, and more.

## Latest nostr

<div id="nostr-container"><ul></ul></div>

<script type="text/javascript">
const relay = "wss://offchain.pub";
const socket = new WebSocket(relay);
const pubkey =
"ff6560d3d0c180d8be922541650ca53debdfa50d10d30d05e1320c0a04b64584";
const messages = [];

function subscribe(pubkey) {
const filter = {
authors: [pubkey],
};
const subscription = ["REQ", "my-sub", filter];
socket.send(JSON.stringify(subscription));
}

function escapeHTML(unsafeText) {
// https://stackoverflow.com/a/48054293/569183
const div = document.createElement("div");
div.innerText = unsafeText;
return div.innerHTML;
}

function renderMessages(messages) {
const list = document.createElement("ul");
list.setAttribute("style", "list-style-type: none; padding-left: 0px; padding-bottom: 10px;");
for (const message of messages) {
const text = message.content;
const date = new Date(message.created_at * 1000);
const date_str = date.toLocaleDateString("en-US");
const time_str = date.toLocaleTimeString("en-US");
const element = document.createElement("li");
element.innerText = `${text}\n ${time_str} on ${date_str}`;
element.setAttribute("style", "padding-bottom: 10px;");
list.appendChild(element);
}
const old_list = document.querySelector("#nostr-container ul");
document.querySelector("#nostr-container").replaceChild(list, old_list);
}

socket.addEventListener("open", function (event) {
subscribe(pubkey);
});

socket.addEventListener("message", function (event) {
const message_data_json = event.data;
const message_data = JSON.parse(message_data_json);
if (!(message_data instanceof Array)) {
console.log("Invalid message: expected Array", message_data);
return;
}
if (message_data.length < 2) {
console.log("Invalid message: too short", message_data);
return;
}
const message_type = message_data[0];
if (message_type !== "EVENT") {
// Can ignore EOSE... for now? TODO: do we need to re-open a sub?
return;
}
if (message_data.length !== 3) {
console.log("Invalid EVENT message: too short", message_data);
return;
}
const event_data = message_data[2];
if (event_data.kind !== 1) {
// Ignore non text-note kinds for now
return;
}
messages.push(event_data);
messages.sort((a, b) => b.created_at - a.created_at);
renderMessages(messages.slice(0, 5));
});
</script>

## I like making things.

That's probably an understatement. Here are some of my favorite projects:
Expand Down
67 changes: 67 additions & 0 deletions webrtc3.html
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@@ -0,0 +1,67 @@
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8"/>
<title>WebRTC chat</title>
</head>
<body>
<h1>Open the JS console!</h1>
<script>
var RTCPeerConnection = window.RTCPeerConnection || webkitRTCPeerConnection || mozRTCPeerConnection;
var peerConn = new RTCPeerConnection({'iceServers': [
// {'urls': [ 'stun:stun.l.google.com:19302', ]},
{ urls: 'stun:freeturn.net:5349' },
{ urls: 'turn:freeturn.net:3478', username: 'free', credential: 'free' },
// { urls: 'turns:freeturn.tel:5349', username: 'free', credential: 'free' },
]});
console.log('Call create(), or join("some offer")');
function create() {
console.log("Creating ...");
var dataChannel = peerConn.createDataChannel('test');
dataChannel.onopen = (e) => {
window.say = (msg) => { dataChannel.send(msg); };
console.log('Say things with say("hi")');
};
dataChannel.onmessage = (e) => { console.log('Got message:', e.data); };
peerConn.createOffer({})
.then((desc) => peerConn.setLocalDescription(desc))
.then(() => {})
.catch((err) => console.error(err));
peerConn.onicecandidate = (e) => {
if (e.candidate == null) {
console.log("Get joiners to call: ", "join(", JSON.stringify(peerConn.localDescription), ")");
}
};
window.gotAnswer = (answer) => {
console.log("Initializing ...");
peerConn.setRemoteDescription(new RTCSessionDescription(answer));
};
}

function join(offer) {
console.log("Joining ...");

peerConn.ondatachannel = (e) => {
var dataChannel = e.channel;
dataChannel.onopen = (e) => {
window.say = (msg) => { dataChannel.send(msg); };
console.log('Say things with say("hi")');
};
dataChannel.onmessage = (e) => { console.log('Got message:', e.data); }
};

peerConn.onicecandidate = (e) => {
if (e.candidate == null) {
console.log("Get the creator to call: gotAnswer(", JSON.stringify(peerConn.localDescription), ")");
}
};

var offerDesc = new RTCSessionDescription(offer);
peerConn.setRemoteDescription(offerDesc);
peerConn.createAnswer({})
.then((answerDesc) => peerConn.setLocalDescription(answerDesc))
.catch((err) => console.warn("Couldn't create answer"));
}
</script>
</body>
</html>
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