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example-client.html
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example-client.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Collabazoo Example Client</title>
<script>
const crossbarHost = '127.0.0.1';
const crossbarPort = 8000;
const blackholeHost = '127.0.0.1';
const blackholePort = 5555;
</script>
<style>
body {
background-color: rgb(160, 160, 160);
}
canvas {
background-color: white;
display: block;
height: 100%;
width: 100%;
}
#errors {
color: red;
}
</style>
</head>
<body>
<p id="errors"></p>
<!-- Login form -->
<form id="login-form">
<div>
<label>
Username
<input type="text" name="username">
</label>
</div>
<div>
<label>
Password
<input type="password" name="password">
</label>
</div>
<div>
<label>
Account Name
<input type="text" name="account_name">
</label>
</div>
<button id="sign-in-button">Sign in</button>
</form>
<!-- Whiteboard -->
<div id="whiteboard-container" hidden>
<h1>Whiteboard</h1>
<!-- TODO: dimensions hardcoded to match Oculus app -->
<canvas id="whiteboard-canvas" width="1638" height="1024">
</canvas>
<button id="clear-button" type="button">Clear (for everyone!)</button>
</div>
<script>
// TODO: replace with something that doesn't suck
const MD5 = function(d){var r = M(V(Y(X(d),8*d.length)));return r.toLowerCase()};function M(d){for(var _,m="0123456789ABCDEF",f="",r=0;r<d.length;r++)_=d.charCodeAt(r),f+=m.charAt(_>>>4&15)+m.charAt(15&_);return f}function X(d){for(var _=Array(d.length>>2),m=0;m<_.length;m++)_[m]=0;for(m=0;m<8*d.length;m+=8)_[m>>5]|=(255&d.charCodeAt(m/8))<<m%32;return _}function V(d){for(var _="",m=0;m<32*d.length;m+=8)_+=String.fromCharCode(d[m>>5]>>>m%32&255);return _}function Y(d,_){d[_>>5]|=128<<_%32,d[14+(_+64>>>9<<4)]=_;for(var m=1732584193,f=-271733879,r=-1732584194,i=271733878,n=0;n<d.length;n+=16){var h=m,t=f,g=r,e=i;f=md5_ii(f=md5_ii(f=md5_ii(f=md5_ii(f=md5_hh(f=md5_hh(f=md5_hh(f=md5_hh(f=md5_gg(f=md5_gg(f=md5_gg(f=md5_gg(f=md5_ff(f=md5_ff(f=md5_ff(f=md5_ff(f,r=md5_ff(r,i=md5_ff(i,m=md5_ff(m,f,r,i,d[n+0],7,-680876936),f,r,d[n+1],12,-389564586),m,f,d[n+2],17,606105819),i,m,d[n+3],22,-1044525330),r=md5_ff(r,i=md5_ff(i,m=md5_ff(m,f,r,i,d[n+4],7,-176418897),f,r,d[n+5],12,1200080426),m,f,d[n+6],17,-1473231341),i,m,d[n+7],22,-45705983),r=md5_ff(r,i=md5_ff(i,m=md5_ff(m,f,r,i,d[n+8],7,1770035416),f,r,d[n+9],12,-1958414417),m,f,d[n+10],17,-42063),i,m,d[n+11],22,-1990404162),r=md5_ff(r,i=md5_ff(i,m=md5_ff(m,f,r,i,d[n+12],7,1804603682),f,r,d[n+13],12,-40341101),m,f,d[n+14],17,-1502002290),i,m,d[n+15],22,1236535329),r=md5_gg(r,i=md5_gg(i,m=md5_gg(m,f,r,i,d[n+1],5,-165796510),f,r,d[n+6],9,-1069501632),m,f,d[n+11],14,643717713),i,m,d[n+0],20,-373897302),r=md5_gg(r,i=md5_gg(i,m=md5_gg(m,f,r,i,d[n+5],5,-701558691),f,r,d[n+10],9,38016083),m,f,d[n+15],14,-660478335),i,m,d[n+4],20,-405537848),r=md5_gg(r,i=md5_gg(i,m=md5_gg(m,f,r,i,d[n+9],5,568446438),f,r,d[n+14],9,-1019803690),m,f,d[n+3],14,-187363961),i,m,d[n+8],20,1163531501),r=md5_gg(r,i=md5_gg(i,m=md5_gg(m,f,r,i,d[n+13],5,-1444681467),f,r,d[n+2],9,-51403784),m,f,d[n+7],14,1735328473),i,m,d[n+12],20,-1926607734),r=md5_hh(r,i=md5_hh(i,m=md5_hh(m,f,r,i,d[n+5],4,-378558),f,r,d[n+8],11,-2022574463),m,f,d[n+11],16,1839030562),i,m,d[n+14],23,-35309556),r=md5_hh(r,i=md5_hh(i,m=md5_hh(m,f,r,i,d[n+1],4,-1530992060),f,r,d[n+4],11,1272893353),m,f,d[n+7],16,-155497632),i,m,d[n+10],23,-1094730640),r=md5_hh(r,i=md5_hh(i,m=md5_hh(m,f,r,i,d[n+13],4,681279174),f,r,d[n+0],11,-358537222),m,f,d[n+3],16,-722521979),i,m,d[n+6],23,76029189),r=md5_hh(r,i=md5_hh(i,m=md5_hh(m,f,r,i,d[n+9],4,-640364487),f,r,d[n+12],11,-421815835),m,f,d[n+15],16,530742520),i,m,d[n+2],23,-995338651),r=md5_ii(r,i=md5_ii(i,m=md5_ii(m,f,r,i,d[n+0],6,-198630844),f,r,d[n+7],10,1126891415),m,f,d[n+14],15,-1416354905),i,m,d[n+5],21,-57434055),r=md5_ii(r,i=md5_ii(i,m=md5_ii(m,f,r,i,d[n+12],6,1700485571),f,r,d[n+3],10,-1894986606),m,f,d[n+10],15,-1051523),i,m,d[n+1],21,-2054922799),r=md5_ii(r,i=md5_ii(i,m=md5_ii(m,f,r,i,d[n+8],6,1873313359),f,r,d[n+15],10,-30611744),m,f,d[n+6],15,-1560198380),i,m,d[n+13],21,1309151649),r=md5_ii(r,i=md5_ii(i,m=md5_ii(m,f,r,i,d[n+4],6,-145523070),f,r,d[n+11],10,-1120210379),m,f,d[n+2],15,718787259),i,m,d[n+9],21,-343485551),m=safe_add(m,h),f=safe_add(f,t),r=safe_add(r,g),i=safe_add(i,e)}return Array(m,f,r,i)}function md5_cmn(d,_,m,f,r,i){return safe_add(bit_rol(safe_add(safe_add(_,d),safe_add(f,i)),r),m)}function md5_ff(d,_,m,f,r,i,n){return md5_cmn(_&m|~_&f,d,_,r,i,n)}function md5_gg(d,_,m,f,r,i,n){return md5_cmn(_&f|m&~f,d,_,r,i,n)}function md5_hh(d,_,m,f,r,i,n){return md5_cmn(_^m^f,d,_,r,i,n)}function md5_ii(d,_,m,f,r,i,n){return md5_cmn(m^(_|~f),d,_,r,i,n)}function safe_add(d,_){var m=(65535&d)+(65535&_);return(d>>16)+(_>>16)+(m>>16)<<16|65535&m}function bit_rol(d,_){return d<<_|d>>>32-_};
</script>
<script>
const crossbarBaseURL = `http://${crossbarHost}:${crossbarPort}/v2`;
const crossbar = {
baseOptions: {
headers: { 'Content-Type': 'application/json' },
},
request: async function (resource, options) {
const response = await fetch(`${crossbarBaseURL}/${resource}`, {
...this.baseOptions,
...options,
});
const json = await response.json();
if (response.ok) {
return json;
} else {
throw new Error(`${json.message}: ${JSON.stringify(json)}`);
}
},
};
const errors = {
el: document.getElementById('errors'),
setMessage: function (message) {
this.el.innerText = message;
},
clearMessage: function () {
this.setMessage('');
},
};
const loginForm = {
el: document.getElementById('login-form'),
getData: function () {
return Object.fromEntries(new FormData(this.el));
},
hide: function () {
this.setHidden(true);
},
show: function () {
this.setHidden(false);
},
setHidden: function (hidden) {
this.el.toggleAttribute('hidden', hidden);
},
onSubmit: function (cb) {
this.el.addEventListener('submit', (event) => {
event.preventDefault();
cb(event);
});
},
};
const signInButton = {
el: document.getElementById('sign-in-button'),
enable: function () {
this.setEnabled(true);
},
disable: function () {
this.setEnabled(false);
},
setEnabled: function (enabled) {
this.el.toggleAttribute('disabled', !enabled);
},
};
loginForm.onSubmit(async (event) => {
errors.clearMessage();
signInButton.disable();
const { username, password, account_name } = loginForm.getData();
const reqData = {
credentials: MD5(`${username}:${password}`),
account_name,
};
try {
const json = await crossbar.request('user_auth', {
method: 'PUT',
body: JSON.stringify({ data: reqData }),
});
loginForm.hide();
whiteboard.show();
whiteboard.enable(json.data.account_id, json.auth_token);
} catch (e) {
errors.setMessage(e.message);
}
signInButton.enable();
});
const whiteboard = {
containerEl: document.getElementById('whiteboard-container'),
canvasEl: document.getElementById('whiteboard-canvas'),
context: {},
webSocket: null,
onWebSocketOpen: () => {},
onWebSocketClose: () => {},
onWebSocketData: () => {},
onWebSocketError: () => {},
enable: function (accountId, authToken) {
this.context = { accountId, authToken };
try {
this.webSocket = new WebSocket(`ws://${blackholeHost}:${blackholePort}`);
this.webSocket.onopen = () => { this.onWebSocketOpen(); };
this.webSocket.onclose = ({ code, reason }) => {
let message = `${code}`;
if (reason) {
message += ` (${reason})`;
}
this.webSocket = null;
this.onWebSocketClose(message);
};
this.webSocket.onmessage = ({ data }) => {
this.onWebSocketData(data);
};
this.webSocket.onerror = (error) => {
this.onWebSocketError(error);
};
} catch (e) {
this.onWebSocketClose(e.message);
}
},
disable: function () {
if (this.webSocket) {
this.webSocket.close();
}
},
subscribe: function (binding) {
this.sendCommand('subscribe', {
auth_token: this.context.authToken,
data: {
account_id: this.context.accountId,
binding,
},
});
},
sendCommand: function (action, data) {
if (this.webSocket) {
this.webSocket.send(JSON.stringify({
action,
...data,
}));
}
},
draw: function (color, points, pointSize) {
const ctx = this.canvasEl.getContext('2d');
ctx.strokeStyle = color;
ctx.lineWidth = pointSize;
ctx.beginPath();
for (let i = 0; i < points.length; i++) {
let [x, y] = points[i];
// Drawing centered on each point
x = x - pointSize / 2;
y = y - pointSize / 2;
// y coords are inverted in Oculus app
y = this.canvasEl.getAttribute('height') - y;
if (i === 0) {
ctx.moveTo(x, y);
} else {
ctx.lineTo(x, y);
}
}
ctx.stroke();
},
clear: function () {
const ctx = this.canvasEl.getContext('2d');
ctx.reset();
},
hide: function () {
this.setHidden(true);
},
show: function () {
this.setHidden(false);
},
setHidden: function (hidden) {
this.containerEl.toggleAttribute('hidden', hidden);
},
};
whiteboard.onWebSocketOpen = () => {
whiteboardStateMachine.handleConnected();
};
whiteboard.onWebSocketClose = (message) => {
const e = new Error(`WebSocket closed: ${message}`);
whiteboardStateMachine.handleError(e);
};
whiteboard.onWebSocketData = (data) => {
try {
const json = JSON.parse(data);
if (json.status === 'error') {
throw new Error(JSON.stringify(json.data));
} else {
whiteboardStateMachine.handleData(json.data);
}
} catch (e) {
whiteboardStateMachine.handleError(e);
}
};
const whiteboardStateMachine = {
state: 'disconnected',
reset: function () {
this.state = 'disconnected';
whiteboard.hide();
whiteboard.disable();
loginForm.show();
},
handleConnected: function () {
this.state = 'connected';
whiteboard.subscribe('collabazoo.event');
},
handleData: function (data) {
if (this.state === 'connected') {
const { event_category, event_name } = data;
if (event_category === 'collabazoo') {
switch (event_name) {
case 'draw':
const { rgb, points, point_size } = data;
const color = `rgb(${rgb.join(',')})`;
whiteboard.draw(color, points, point_size);
break;
case 'clear':
whiteboard.clear();
}
}
}
},
handleError: function (e) {
this.reset();
errors.setMessage(e.message);
},
};
const clearButton = document.getElementById('clear-button');
clearButton.addEventListener('click', () => {
whiteboard.sendCommand('collabazoo', {
data: {
account_id: whiteboard.context.accountId,
command: 'clear',
},
});
});
</script>
</body>
</html>