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chat.tpl
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<!doctype html>
<html><head>
<title>Chat App</title>
<meta name="viewport" content="width=device-width, user-scalable=no">
<link rel="manifest" href="/manifest.json">
<link rel="icon" type="image/png" href="/static/hangouts.png" sizes="42x42">
<link href="/static/roboto.css" rel="stylesheet" type="text/css">
<style>
html, body {
font-family: 'Roboto', sans-serif;
margin: 0;
}
#loading-page {
position: fixed;
top: 0; right: 0; bottom: 0; left: 0;
background: white;
z-index: 2;
}
#login-page {
position: fixed;
top: 0; right: 0; bottom: 0; left: 0;
background: white;
opacity: 1;
transition: opacity 0.5s;
}
#workaround-header {
display: none;
height: 56px;
background-color: #0a7e07;
}
.action-bar {
background-color: #259b24;
color: white;
line-height: 64px;
font-size: 24px;
background-image: url("/static/hamburger.svg");
background-size: 24px 24px;
background-repeat: no-repeat;
background-position: 24px center;
padding-left: 72px;
}
.action-bar > .action-buttons {
float: right;
font-size: 20px;
}
.action-bar > .action-buttons > #logout {
display: inline-block;
cursor: pointer;
padding: 0 24px;
vertical-align: top;
color: white;
font-size: 14px;
font-weight: bold;
text-transform: uppercase;
text-decoration: none;
}
#join-form, #send-form, #incoming-messages {
margin: 1em;
}
#join-form, #join-form *, #send-form, #send-form *, #incoming-messages {
font-size: 16px;
vertical-align: middle;
}
#message {
line-height: 32px;
}
#send-form > button {
width: 48px;
height: 48px;
background: url(/static/send.png);
background-size: contain;
border: none;
padding: 0;
margin: 0;
}
.success {
color: green;
font-style: italic;
}
.fail {
color: red;
font-style: italic;
font-weight: bold;
}
</style>
</head><body>
<section id="loading-page"></section>
<section id="login-page">
<div class="action-bar">Team chat</div>
<form id="join-form">
<label>Username: <input type="text" id="username"></label><br>
<button>Join chatroom</button><span id="join-result"></span><span id="join-resultLink"></span>
</form>
</section>
<section id="chat-page">
<div id="workaround-header"></div>
<div class="action-bar">
Team chat
<div class="action-buttons">
<span id="active-username"></span>
<a id="logout">Logout</a>
</div>
</div>
<pre id="incoming-messages"></pre>
<form id="send-form">
<input type="text" id="message">
<button></button><span id="send-result"></span><span id="send-resultLink"></span>
</form>
</section>
<script src="/static/localforage.js"></script>
<script>
var $ = document.querySelector.bind(document);
function crazyHack() {
if (window.outerHeight == 0) {
setTimeout(crazyHack, 32);
return;
}
// CRAZY HACK: When opening Chrome after receiving a push message in
// the background, the top controls manager can get confused,
// causing the omnibox to permanently overlap the top 56 pixels of
// the page. Detect this and work around it with a spacer div.
// TODO: Fix this in Chrome!
console.log("screen.height = " + screen.height);
console.log("window.outerHeight = " + window.outerHeight);
if (screen.height - window.outerHeight == 25) {
$('#workaround-header').style.display = 'block';
}
}
crazyHack();
window.addEventListener("resize", crazyHack);
function setStatus(buttonName, className, text, responseText) {
var result = $('#' + buttonName + '-result');
var resultLink = $('#' + buttonName + '-resultLink');
if (className == 'success')
result.textContent = ""; // Don't bother notifying success.
else
result.textContent = " " + text;
if (responseText) {
var mimeType = /^\s*</.test(responseText) ? 'text/html'
: 'text/plain';
resultLink.innerHTML = " <a href='data:" + mimeType + ","
+ encodeURIComponent(responseText)
+ "'>(Debug info)</a>";
} else {
resultLink.innerHTML = "";
}
if (!text)
return;
result.className = className;
resultLink.className = className;
if (buttonName == 'join' && className == 'fail')
$('#join-form > button').disabled = false;
console.log(buttonName + " " + className + ": " + text
+ (responseText ? "\n" + responseText : ""));
}
function setBothStatuses(className, message) {
setStatus('join', className, message);
setStatus('send', className, message);
}
var hasPush = !!window.PushManager;
var hasNotification =
!!window.ServiceWorkerRegistration &&
!!ServiceWorkerRegistration.prototype.showNotification;
var hasServiceWorker = !!navigator.serviceWorker;
var supportsPush = hasPush && hasNotification && hasServiceWorker;
if (!supportsPush) {
if (!hasPush || !hasServiceWorker) {
var whatsMissing = hasPush ? "ServiceWorker" : hasServiceWorker ? "push messaging" : "push messaging or ServiceWorker";
setBothStatuses('fail', "Your browser does not support " + whatsMissing + "; you won't be able to receive messages.");
} else if (!hasNotification) {
setBothStatuses('fail', "Your browser doesn't support showing notifications from a Service Worker; you won't be able to receive messages when the page is not open");
}
}
var usernamePromise = localforage.getItem('username');
window.addEventListener('DOMContentLoaded', function() {
usernamePromise.then(function(username) {
var AUTO_SUBSCRIBE_USERNAME = '{{user_from_get}}';
if (username != null) {
// We've already subscribed.
// TODO: Check SW hasn't been unregistered (e.g. because
// user cleared it in chrome://serviceworker-internals).
$('#username').value = username;
showChatScreen(true);
} else if (AUTO_SUBSCRIBE_USERNAME) {
// Try to auto-subscribe.
$('#username').value = AUTO_SUBSCRIBE_USERNAME;
joinChat();
} else {
$('#username').focus();
}
$('#active-username').textContent = $('#username').value;
$('#loading-page').style.display = 'none';
});
});
$('#logout').addEventListener('click', function(evt) {
navigator.serviceWorker.getRegistration('/chat/').then(function(r) {
// Unregistering the SW will also unsubscribe from Push.
if (r) return r.unregister();
}).then(function() {
return localforage.clear();
}).then(function() {
location.reload();
});
});
$('#join-form').addEventListener('submit', function(evt) {
evt.preventDefault();
joinChat();
});
function joinChat() {
$('#join-form > button').disabled = true;
setStatus('join', '', "");
console.log("join-form submit handler");
if (!hasPush || !hasServiceWorker) {
showChatScreen(false);
return;
}
navigator.serviceWorker.register('/chat/sw.js', { scope: "/chat/" })
.then(function(sw) {
requestPermission();
}, function(error) {
console.error(error);
setStatus('join', 'fail', "SW registration rejected: " + error);
});
}
function requestPermission() {
if (!hasNotification) {
subscribeForPush();
return;
}
Notification.requestPermission(function(permission) {
if (permission == "granted") {
subscribeForPush();
return;
}
$('#join-form > button').disabled = false;
if (permission == "denied") {
setStatus('join', 'fail', "Notification permission denied. "
+ "Reset it via Page Info.");
} else { // "default"
// This never currently gets triggered in Chrome, due to
// https://crbug.com/434547 :-(
setStatus('join', 'fail', "Notification permission prompt "
+ "dismissed. Reload to try "
+ "again.");
}
});
}
function subscribeForPush() {
console.log("subscribeForPush");
navigator.serviceWorker.ready.then(function(swr) {
// TODO: Ideally we wouldn't have to check this here, since
// the hasPush check earlier would guarantee it.
if (!swr.pushManager) {
setBothStatuses('fail', "Your browser does not support push messaging; you won't be able to receive messages.");
showChatScreen(false);
} else {
doSubscribe(swr.pushManager);
}
});
}
function doSubscribe(pushManager) {
pushManager.subscribe().then(function(ps) {
console.log(JSON.stringify(ps));
sendSubscriptionToBackend(ps.endpoint, ps.subscriptionId);
}, function(err) {
setStatus('join', 'fail', "API call unsuccessful! " + err);
});
}
function sendSubscriptionToBackend(endpoint, subscriptionId) {
console.log("Sending subscription to " + location.hostname + "...");
var formData = new FormData();
formData.append('endpoint', endpoint);
formData.append('subscription_id', subscriptionId);
var xhr = new XMLHttpRequest();
xhr.onload = function() {
if (('' + xhr.status)[0] != '2') {
setStatus('join', 'fail', "Server error " + xhr.status
+ ": " + xhr.statusText);
} else {
setStatus('join', 'success', "Subscribed.");
showChatScreen(false);
}
};
xhr.onerror = xhr.onabort = function() {
setStatus('join', 'fail', "Failed to send subscription ID!");
};
xhr.open('POST', '/chat/subscribe');
xhr.send(formData);
}
function showChatScreen(immediate) {
$('#message').focus();
if (immediate) {
$('#login-page').style.display = 'none';
return;
}
localforage.setItem('username', $('#username').value);
$('#active-username').textContent = $('#username').value;
$('#login-page').style.opacity = 0;
setTimeout(function() {
$('#login-page').style.display = 'none';
}, 510);
}
function updateText() {
localforage.getItem('messages').then(function(text) {
$('#incoming-messages').textContent = text;
// Poll for new messages; TODO: instead, postMessage from SW.
setTimeout(updateText, 100);
});
}
function fetchMessages() {
var req = new XMLHttpRequest();
req.open("GET", "/chat/messages");
req.onload = function() {
localforage.setItem('messages', req.responseText)
.then(function() { updateText(); });
};
req.send();
}
fetchMessages();
$('#send-form').addEventListener('submit', function(evt) {
evt.preventDefault();
console.log("Sending message to " + location.hostname + "...");
setStatus('send', '', "");
var message = $('#message').value;
message = message.replace(":)", "😃"); // Smiley
var formData = new FormData();
formData.append('message',
$('#username').value + ": " + message);
var xhr = new XMLHttpRequest();
xhr.onload = function() {
var statusString = xhr.status + ": " + xhr.statusText;
if (('' + xhr.status)[0] != '2') {
setStatus('send', 'fail', "Server error " + statusString,
xhr.responseText);
} else {
setStatus('send', 'success', "Sent, status " + statusString,
xhr.responseText);
$('#message').value = "";
}
};
xhr.onerror = xhr.onabort = function() {
setStatus('send', 'fail', "Failed to send!");
};
xhr.open('POST', '/chat/send');
xhr.send(formData);
});
</script>
</body></html>