watch-party/frontend/lib/chat.mjs

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JavaScript
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import {
setDebounce,
setVideoTime,
setPlaying,
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} from "./watch-session.mjs?v=048af96";
import { emojify, findEmojis } from "./emojis.mjs?v=048af96";
import { linkify } from "./links.mjs?v=048af96";
import { joinNewSession } from "./watch-session.mjs?v=048af96";
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function setCaretPosition(elem, caretPos) {
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if (elem.createTextRange) {
var range = elem.createTextRange();
range.move("character", caretPos);
range.select();
} else {
if (elem.selectionStart) {
elem.focus();
elem.setSelectionRange(caretPos, caretPos);
} else elem.focus();
}
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}
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const setupChatboxEvents = (socket) => {
// clear events by just reconstructing the form
const oldChatForm = document.querySelector("#chatbox-send");
const chatForm = oldChatForm.cloneNode(true);
const messageInput = chatForm.querySelector("input");
const emojiAutocomplete = chatForm.querySelector("#emoji-autocomplete");
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oldChatForm.replaceWith(chatForm);
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let autocompleting = false,
showListTimer;
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const replaceMessage = (message) => () => {
messageInput.value = message;
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autocomplete();
};
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async function autocomplete(fromListTimeout) {
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if (autocompleting) return;
try {
clearInterval(showListTimer);
emojiAutocomplete.textContent = "";
autocompleting = true;
let text = messageInput.value.slice(0, messageInput.selectionStart);
const match = text.match(/(:[^\s:]+)?:([^\s:]*)$/);
if (!match || match[1]) return (autocompleting = false); // We don't need to autocomplete.
const prefix = text.slice(0, match.index);
const search = text.slice(match.index + 1);
if (search.length < 1 && !fromListTimeout) {
autocompleting = false;
showListTimer = setTimeout(() => autocomplete(true), 500);
return;
}
const suffix = messageInput.value.slice(messageInput.selectionStart);
let selected;
const select = (button) => {
if (selected) selected.classList.remove("selected");
selected = button;
button.classList.add("selected");
};
let results = await findEmojis(search);
let yieldAt = performance.now() + 13;
for (let i = 0; i < results.length; i += 100) {
emojiAutocomplete.append.apply(
emojiAutocomplete,
results.slice(i, i + 100).map(([name, replaceWith, ext], i) => {
const button = Object.assign(document.createElement("button"), {
className: "emoji-option",
onmousedown: (e) => e.preventDefault(),
onclick: () => {
messageInput.value = prefix + replaceWith + " " + suffix;
setCaretPosition(
messageInput,
(prefix + " " + replaceWith).length
);
},
onmouseover: () => select(button),
onfocus: () => select(button),
type: "button",
title: name,
});
button.append(
replaceWith[0] !== ":"
? Object.assign(document.createElement("span"), {
textContent: replaceWith,
className: "emoji",
})
: Object.assign(new Image(), {
loading: "lazy",
src: `/emojis/${name}${ext}`,
className: "emoji",
}),
Object.assign(document.createElement("span"), {
textContent: name,
className: "emoji-name",
})
);
return button;
})
);
if (i == 0 && emojiAutocomplete.children[0]) {
emojiAutocomplete.children[0].scrollIntoView();
select(emojiAutocomplete.children[0]);
}
const now = performance.now();
if (now > yieldAt) {
yieldAt = now + 13;
await new Promise((cb) => setTimeout(cb, 0));
}
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}
autocompleting = false;
} catch (e) {
autocompleting = false;
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}
}
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messageInput.addEventListener("input", () => autocomplete());
messageInput.addEventListener("selectionchange", () => autocomplete());
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messageInput.addEventListener("keydown", (event) => {
if (event.key == "ArrowUp" || event.key == "ArrowDown") {
let selected = document.querySelector(".emoji-option.selected");
if (!selected) return;
event.preventDefault();
selected.classList.remove("selected");
selected =
event.key == "ArrowDown"
? selected.nextElementSibling || selected.parentElement.children[0]
: selected.previousElementSibling ||
selected.parentElement.children[
selected.parentElement.children.length - 1
];
selected.classList.add("selected");
selected.scrollIntoView({ scrollMode: "if-needed", block: "nearest" });
}
if (event.key == "Tab") {
let selected = document.querySelector(".emoji-option.selected");
if (!selected) return;
event.preventDefault();
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selected.onclick();
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}
});
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chatForm.addEventListener("submit", async (e) => {
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e.preventDefault();
const content = messageInput.value;
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if (content.trim().length) {
messageInput.value = "";
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// handle commands
if (content.startsWith("/")) {
const command = content.toLowerCase().match(/^\/\S+/)[0];
const args = content.slice(command.length).trim();
let handled = false;
switch (command) {
case "/ping":
socket.send(
JSON.stringify({
op: "Ping",
data: args,
})
);
handled = true;
break;
case "/sync":
const sessionId = window.location.hash.slice(1);
const { current_time_ms, is_playing } = await fetch(
`/sess/${sessionId}`
).then((r) => r.json());
setDebounce();
setPlaying(is_playing);
setVideoTime(current_time_ms);
const syncMessageContent = document.createElement("span");
syncMessageContent.appendChild(
document.createTextNode("resynced you to ")
);
syncMessageContent.appendChild(
document.createTextNode(formatTime(current_time_ms))
);
printChatMessage("set-time", "/sync", "b57fdc", syncMessageContent);
handled = true;
break;
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case "/shrug":
socket.send(
JSON.stringify({
op: "ChatMessage",
data: `${args} ¯\\_(ツ)_/¯`.trim(),
})
);
handled = true;
break;
case "/join":
joinNewSession(args);
handled = true;
break;
case "/help":
const helpMessageContent = document.createElement("span");
helpMessageContent.innerHTML =
"Available commands:<br>" +
"&emsp;<code>/help</code> - display this help message<br>" +
"&emsp;<code>/ping [message]</code> - ping all viewers<br>" +
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"&emsp;<code>/sync</code> - resyncs you with other viewers<br>" +
"&emsp;<code>/shrug</code> - appends ¯\\_(ツ)_/¯ to your message<br>" +
"&emsp;<code>/join [session id]</code> - joins another session";
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printChatMessage(
"command-message",
"/help",
"b57fdc",
helpMessageContent
);
handled = true;
break;
default:
break;
}
if (handled) {
return;
}
}
// handle regular chat messages
socket.send(
JSON.stringify({
op: "ChatMessage",
data: content,
})
);
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}
});
};
/**
* @param {WebSocket} socket
*/
export const setupChat = async (socket) => {
document.querySelector("#chatbox-container").style["display"] = "flex";
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setupChatboxEvents(socket);
};
const addToChat = (node) => {
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const chatbox = document.querySelector("#chatbox");
chatbox.appendChild(node);
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chatbox.scrollTop = chatbox.scrollHeight;
};
let lastTimeMs = null;
let lastPlaying = false;
const checkDebounce = (event) => {
let timeMs = null;
let playing = null;
if (event.op == "SetTime") {
timeMs = event.data;
} else if (event.op == "SetPlaying") {
timeMs = event.data.time;
playing = event.data.playing;
}
let shouldIgnore = false;
if (timeMs != null) {
if (lastTimeMs && Math.abs(lastTimeMs - timeMs) < 500) {
shouldIgnore = true;
}
lastTimeMs = timeMs;
}
if (playing != null) {
if (lastPlaying != playing) {
shouldIgnore = false;
}
lastPlaying = playing;
}
return shouldIgnore;
};
/**
* @returns {string}
*/
const getCurrentTimestamp = () => {
const t = new Date();
return `${matpad(t.getHours())}:${matpad(t.getMinutes())}:${matpad(
t.getSeconds()
)}`;
};
/**
* https://media.discordapp.net/attachments/834541919568527361/931678814751301632/66d2c68c48daa414c96951381665ec2e.png
*/
const matpad = (n) => {
return ("00" + n).slice(-2);
};
/**
* @param {string} eventType
* @param {string?} user
* @param {Node?} content
*/
export const printChatMessage = (eventType, user, colour, content) => {
const chatMessage = document.createElement("div");
chatMessage.classList.add("chat-message");
chatMessage.classList.add(eventType);
chatMessage.title = getCurrentTimestamp();
if (user != null) {
const userName = document.createElement("strong");
userName.style = `--user-color: #${colour}`;
userName.textContent = user + " ";
chatMessage.appendChild(userName);
}
if (content != null) {
chatMessage.appendChild(content);
}
addToChat(chatMessage);
return chatMessage;
};
const formatTime = (ms) => {
const seconds = Math.floor((ms / 1000) % 60);
const minutes = Math.floor((ms / (60 * 1000)) % 60);
const hours = Math.floor((ms / (3600 * 1000)) % 3600);
return `${hours < 10 ? "0" + hours : hours}:${
minutes < 10 ? "0" + minutes : minutes
}:${seconds < 10 ? "0" + seconds : seconds}`;
};
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export const logEventToChat = async (event) => {
if (checkDebounce(event)) {
return;
}
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switch (event.op) {
case "UserJoin": {
printChatMessage(
"user-join",
event.user,
event.colour,
document.createTextNode("joined")
);
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break;
}
case "UserLeave": {
printChatMessage(
"user-leave",
event.user,
event.colour,
document.createTextNode("left")
);
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break;
}
case "ChatMessage": {
const messageContent = document.createElement("span");
messageContent.classList.add("message-content");
messageContent.append(...(await linkify(event.data, emojify)));
printChatMessage(
"chat-message",
event.user,
event.colour,
messageContent
);
break;
}
case "SetTime": {
const messageContent = document.createElement("span");
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if (event.data.from != undefined) {
messageContent.appendChild(
document.createTextNode("set the time from ")
);
messageContent.appendChild(
document.createTextNode(formatTime(event.data.from))
);
messageContent.appendChild(document.createTextNode(" to "));
} else {
messageContent.appendChild(document.createTextNode("set the time to "));
}
messageContent.appendChild(
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document.createTextNode(formatTime(event.data.to))
);
printChatMessage("set-time", event.user, event.colour, messageContent);
break;
}
case "SetPlaying": {
const messageContent = document.createElement("span");
messageContent.appendChild(
document.createTextNode(
event.data.playing ? "started playing" : "paused"
)
);
messageContent.appendChild(document.createTextNode(" at "));
messageContent.appendChild(
document.createTextNode(formatTime(event.data.time))
);
printChatMessage("set-playing", event.user, event.colour, messageContent);
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break;
}
case "Ping": {
const messageContent = document.createElement("span");
if (event.data) {
messageContent.appendChild(document.createTextNode("pinged saying: "));
messageContent.appendChild(document.createTextNode(event.data));
} else {
messageContent.appendChild(document.createTextNode("pinged"));
}
printChatMessage("ping", event.user, event.colour, messageContent);
beep();
break;
}
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}
};
const beep = () => {
const context = new AudioContext();
const gain = context.createGain();
gain.connect(context.destination);
gain.gain.value = 0.1;
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const oscillator = context.createOscillator();
oscillator.connect(gain);
oscillator.frequency.value = 520;
oscillator.type = "square";
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oscillator.start(context.currentTime);
oscillator.stop(context.currentTime + 0.22);
};
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export const updateViewerList = (viewers) => {
const listContainer = document.querySelector("#viewer-list");
// empty out the current list
listContainer.innerHTML = "";
// display the updated list
for (const viewer of viewers) {
const viewerElem = document.createElement("div");
const content = document.createElement("strong");
content.textContent = viewer.nickname;
content.style = `--user-color: #${viewer.colour}`;
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viewerElem.appendChild(content);
listContainer.appendChild(viewerElem);
}
};