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Add minimal client example.
This commit is contained in:
Juliusz Chroboczek
parent
bc512462c7
commit
ac47a82e2f
3 changed files with 279 additions and 1 deletions
22
static/example/example.html
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static/example/example.html
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<title>Galène client example</title>
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<link rel="author" href="https://www.irif.fr/~jch/"/>
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</head>
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<body>
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<p id="status">Disconnected</p>
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<p id="error"></p>
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<div><button id="show" disabled>Show/hide yourself</button></div>
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<video id="video"></video>
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<div id="chat"></div>
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<script src="/protocol.js" defer></script>
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<script src="example.js" defer></script>
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</body>
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</html>
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255
static/example/example.js
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static/example/example.js
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/* Galene client example. Send-only for now. */
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/**
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* The main function.
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*
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* @param {string} url
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*/
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async function start(url) {
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// fetch the group information
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let r = await fetch(url + ".status");
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if(!r.ok) {
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throw new Error(`${r.status} ${r.statusText}`);
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}
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let status = await r.json();
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// parse a token in the URL.
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let token = null;
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let parms = new URLSearchParams(window.location.search);
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if(parms.has('token'))
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token = parms.get('token');
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// connect to the server
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if(token) {
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await serverConnect(status, token);
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} else if(status.authPortal) {
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window.location.href = groupStatus.authPortal
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} else {
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serverConnect(status, null);
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}
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}
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/**
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* Display the connection status.
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*
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* @parm {string} status
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*/
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function displayStatus(status) {
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let c = document.getElementById('status');
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c.textContent = status;
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}
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/**
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* Connect to the server.
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*
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* @parm {Object} status
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* @parm {string} token
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*/
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async function serverConnect(status, token) {
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// create the connection to the server
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let conn = new ServerConnection();
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conn.onconnected = async function() {
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displayStatus('Connected');
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let creds = token ?
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{type: 'token', token: token} :
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{type: 'password', password: ''};
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// join the group and wait for the onjoined callback
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await this.join("public", "example-user", creds);
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};
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conn.onchat = onChat;
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conn.onusermessage = onUserMessage;
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conn.ondownstream = function(s) {
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// This should not happen, since we didn't ask to receive streams.
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console.warn('Received unexpected stream from server');
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s.abort();
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}
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conn.onclose = function() {
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displayStatus('Disconnected');
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}
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conn.onjoined = onJoined;
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// connect and wait for the onconnected callback
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await conn.connect(status.endpoint);
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}
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/**
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* Called whenever we receive a chat message.
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*
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* @this {ServerConnection}
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* @parm {string} username
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* @parm {string} message
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*/
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function onChat(id, dest, username, time, privileged, history, kind, message) {
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let p = document.createElement('p');
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p.textContent = `${username}${dest ? ' → ' + dest : ''}: ${message}`;
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let container = document.getElementById('chat');
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container.appendChild(p);
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}
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/**
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* Called whenever we receive a user message.
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*
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* @this {ServerConnection}
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* @parm {string} username
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* @parm {string} message
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* @parm {string} kind
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*/
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function onUserMessage(id, dest, username, time, privileged, kind, error, message) {
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switch(kind) {
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case 'kicked':
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case 'error':
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case 'warning':
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case 'info':
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if(!privileged) {
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console.error(`Got unprivileged message of kind ${kind}`);
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return;
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}
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displayError(message);
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break;
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case 'clearchat':
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if(!privileged) {
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console.error(`Got unprivileged message of kind ${kind}`);
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return;
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}
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document.getElementById('chat').textContent = '';
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break;
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}
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}
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/**
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* Find the camera stream, if any.
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*
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* @parm {string} conn
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* @returns {Stream}
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*/
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function cameraStream(conn) {
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for(let id in conn.up) {
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let s = conn.up[id];
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if(s.label === 'camera')
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return s;
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}
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return null;
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}
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/**
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* Enable or disable the show/hide button.
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*
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* @parm{ServerConnection} conn
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* @parm{boolean} enable
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*/
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function enableShow(conn, enable) {
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let b = /** @type{HTMLButtonElement} */(document.getElementById('show'));
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if(enable) {
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b.onclick = function() {
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let s = cameraStream(conn);
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if(!s)
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showCamera(conn);
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else
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hide(conn, s);
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}
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b.disabled = false;
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} else {
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b.disabled = true;
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b.onclick = null;
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}
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}
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/**
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* Called when we join or leave a group.
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*
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* @this {ServerConnection}
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* @parm {string} kind
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* @parm {string} message}
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*/
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async function onJoined(kind, group, perms, status, data, error, message) {
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switch(kind) {
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case 'fail':
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displayError(message);
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enableShow(this, false);
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this.close();
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break;
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case 'redirect':
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this.close();
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document.location.href = message;
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return;
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case 'leave':
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displayStatus('Connected');
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enableShow(this, false);
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this.close();
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break;
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case 'join':
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case 'change':
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displayStatus(`Connected as ${this.username} in group ${this.group}.`);
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enableShow(this, true);
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break;
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default:
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displayError(`Unexpected state ${kind}.`);
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this.close();
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break;
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}
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}
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/**
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* Enable the camera and broadcast yourself to the group.
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*
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* @parm {ServerConnection} conn
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*/
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async function showCamera(conn) {
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let v = /** @type HTMLVideoElement */(document.getElementById('video'));
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let ms = await navigator.mediaDevices.getUserMedia({audio: true, video: true});
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/* Send the new stream to the server */
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let s = conn.newUpStream();
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s.label = 'camera';
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s.setStream(ms);
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s.onclose = function(replace) {
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v.srcObject = null;
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}
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function addTrack(t) {
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t.oneneded = function(e) {
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ms.onaddtrack = null;
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s.onremovetrack = null;
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s.close();
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}
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s.pc.addTransceiver(t, {
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direction: 'sendonly',
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streams: [ms],
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});
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}
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// Make sure all future tracks are added.
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s.onaddtrack = function(e) {
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addTrack(e.track);
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}
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// Add any existing tracks.
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ms.getTracks().forEach(addTrack);
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// Connect the MediaStream to the video element and start playing.
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v.srcObject = ms;
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v.muted = true;
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v.play();
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}
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/**
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* Stop broadcasting.
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*
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* @parm {ServerConnection} conn
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* @parm {Stream} s
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*/
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async function hide(conn, s) {
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s.stream.getTracks().forEach(t => t.stop());
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s.close();
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}
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/**
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* Display an error message.
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*
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* @parm {string} message
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*/
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function displayError(message) {
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document.getElementById('error').textContent = message;
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}
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start("/group/public/").catch(e => displayError(e));
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@ -15,6 +15,7 @@
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"files": [
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"protocol.js",
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"galene.js",
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"management.js"
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"management.js",
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"example/example.js"
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]
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}
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