[reliable-chat] / webclient / rc.html

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
  "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<!--
 reliable-chat - multipath chat
 Copyright (C) 2012  Scott Worley <sworley@chkno.net>
 Copyright (C) 2012  Jason Hibbs <skitch@gmail.com>

 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU Affero General Public License as
 published by the Free Software Foundation, either version 3 of the
 License, or (at your option) any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU Affero General Public License for more details.

 You should have received a copy of the GNU Affero General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
-->
<head>
 <title>Reliable Chat</title>
  <style type="text/css"><!--/*--><![CDATA[/*><!--*/
	html, body {
		width: 99.9%;
		height: 100%;
		margin: 0;
		padding: 0;
		background-color: #293134;
		color: silver;
		font-family: monospace;
	}
	#container {
		height: 100%;
	}
	#status {
		width: 100%;
		text-align: right;
		background-color: #293134;
		padding: 5px 5px 5px 0px;
	}
	#client {
		width: 98.5%;
		padding: 0px 0px 0px 5px;
		height: 50px;
		position: fixed;
		bottom: 0;
	}
	#input {
		width: 100%;
		background-color: #293134;
	}
	#say { width: 100% }
	#history {
		padding: 0px 5px 55px 5px;
		vertical-align: bottom
	}
	img { width: 1px; height: 1px; }
	iframe { display: none }
	#status span { margin-right: 10px; }
	#status span.sad {
		background-color: #f00;
		color: #fff;
		border: 1px solid black;
		border-radius: 5px;
		padding-left: 5px;
		padding-right: 5px;
	}
	#status span.happy {
		background-color: #0f0;
		color: #000;
		border: 1px solid black;
		border-radius: 5px;
		padding-left: 5px;
		padding-right: 5px;
	}
  /*]]>*/--></style>
  <script type="text/javascript"><!--//--><![CDATA[//><!--
	var servers = ['chkno.net', 'rc2.chkno.net', 'echto.net', 'the-wes.com', 'vibrantlogic.com'];

	var session = Math.random();  // For outgoing message IDs
	var since = {};    // server -> time: For fetch?since=
	var seen = {};     // seen_key -> message
	var history = [];  // List of messages sorted by Time
	// Messages have these fields:
	//   Time: The timestamp.  Median of ServerTimes
	//   ID: Some unique string for deduping
	//   Text: The text of the message
	//   ServerTimes: server -> timestamp
	//   UI: The DOM node for this message in the UI

	function rcnick() {
		var nick = localStorage.getItem("nick");
		if (nick) {
			return nick;
		}
		return 'anonymous';
	}

	function rcsetnick(new_nick) {
		localStorage.setItem("nick", new_nick);
	}

	function rcserverbase(server) {
		// Add the default port if server doesn't contain a port number already
		if (server.indexOf(":") == -1) {
			return "http://" + server + ":21059";
		} else {
			return "http://" + server;
		}
	}

	function rcchangeserverstatus(server, new_status) {
		var statusbar = document.getElementById("status");
		var spans = statusbar.getElementsByTagName("span");
		for (var i in spans) {
			if (spans[i].firstChild && 'data' in spans[i].firstChild && spans[i].firstChild.data == server) {
				spans[i].setAttribute("class", new_status);
			}
		}
	}

	function rcformattime(t) {
		var d = t.getDay();
		d = ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"][d];
		var h = t.getHours();
		var m = t.getMinutes();
		var s = t.getSeconds();
		function pad(x) {
			return (x < 10 ? "0" : "") + x;
		}
		return d + " " + pad(h) + ":" + pad(m) + ":" + pad(s);
	}

	function rcaddmessagetohistory(message) {
		var message_i;
		if (message.Time) {
			for (var i = history.length - 1; ; i--) {
				if (i < 0 || (history[i].Time && message.Time >= history[i].Time)) {
					message_i = i+1;
					history.splice(message_i, 0, message);
					break;
				}
			}
		} else {
			history.push(message);
			message_i = history.length-1;
		}

		if (!message.UI) {
			var text = (message.Time ? rcformattime(message.Time) : "") + " " + message.Text;
			message.UI = document.createElement("div");
			message.UI.appendChild(document.createTextNode(text));
		}
		var h = document.getElementById("history");
		if (message_i + 1 < history.length) {
			h.insertBefore(message.UI, history[message_i + 1].UI);
		} else {
			h.appendChild(message.UI);
		}
		window.scrollTo(0, document.body.scrollHeight);
	}

	function make_seen_key(id, text) {
		return id.replace(/@/g, "@@") + "_@_" + text.replace(/@/g, "@@");
	}

	function rcupdatemessagetime(message) {
		// Set message.Time to be the median of message.ServerTimes
		var times = [];
		for (var i in message.ServerTimes) {
			times.push(message.ServerTimes[i]);
		}
		times.sort();
		if (times.length % 2) {
			message.Time = times[(times.length-1)/2];
		} else {
			var middle = times.length/2;
			var difference = times[middle].getTime() - times[middle-1].getTime();
			message.Time = new Date(times[middle-1].getTime() + difference/2);
		}

		// This may have broken history's in-sorted-order invariant
		var hi = history.indexOf(message);
		if ((history[hi-1] && history[hi-1].Time > message.Time) ||
		    (history[hi+1] && history[hi+1].Time < message.Time)) {
			history.splice(hi,1);
			rcaddmessagetohistory(message);
		}
	}

	function rcreceivemessages(server, messages) {
		for (var i in messages) {
			var m = messages[i];
			m.Time = new Date(m.Time);
			var seen_key = make_seen_key(m.ID, m.Text);
			if (seen_key in seen) {
				seen[seen_key].ServerTimes[server] = m.Time;
				rcupdatemessagetime(seen[seen_key]);
			} else {
				m.ServerTimes = {};
				m.ServerTimes[server] = m.Time;
				seen[seen_key] = m;
				rcaddmessagetohistory(m);
				for (var i in servers) {
					rcchangeserverstatus(servers[i], "sad");
				}
			}
			rcchangeserverstatus(server, "happy");
		}
	}

	function rcfetch(server) {
		var delay = 10000;  // TODO: Exponential backoff
		var xhr = new XMLHttpRequest();
		xhr.onreadystatechange = function() {
			if (this.readyState == this.DONE) {
				if (this.status == 200) {
					var rtxt = this.responseText;
					if (rtxt != null) {
						var messages = JSON.parse(rtxt);
						if (messages != null) {
							delay = 40;
							if (messages.length >= 1 && "Time" in messages[messages.length-1]) {
								since[server] = messages[messages.length-1].Time;
							}
							rcreceivemessages(server, messages);
						}
					}
				}
				window.setTimeout(rcfetch, delay, server);
			}
		}
		var uri = rcserverbase(server) + "/fetch";
		if (server in since) {
			uri += '?since="' + since[server] + '"';
		}
		xhr.open("GET", uri);
		xhr.send();
	}

	function rcconnect() {
		for (var i in servers) {
			rcfetch(servers[i]);
			// Status bar entry
			var status_indicator = document.createElement("span");
			status_indicator.appendChild(document.createTextNode(servers[i]));
			status_indicator.setAttribute("class", "sad");
			document.getElementById("status").appendChild(status_indicator);
		}
	}

	function rcsend(d, message) {
		message.ID = new Date().getTime() + "-" + session + "-" + Math.random();
		seen[make_seen_key(message.ID, message.Text)] = message;
		var path = "/speak" +
			"?id=" + encodeURIComponent(message.ID) +
			"&text=" + encodeURIComponent(message.Text);
		for (var i in servers) {
			var uri = rcserverbase(servers[i]) + path;
			var img = document.createElement("img");
			img.setAttribute("src", uri);
			d.appendChild(img);
		}
	}

	function rcinput(input) {
		var message;
		var re = /^\/([a-z]+) (.*)/
		var match = re.exec(input);
		if (match && match[1] == 'me') {
			message = "* " + rcnick() + "  " + match[2];
		} else if (match && match[1] == 'nick') {
			message = "*** " + rcnick() + " is now known as " + match[2];
			rcsetnick(match[2]);
		} else {
			message = "<" + rcnick() + "> " + input;
		}

		var m = {'Text': message, 'ServerTimes': {}};
		rcaddmessagetohistory(m);
		rcsend(m.UI, m);
	}

	function rckeydown(event) {
		if (event.keyCode == 13) {
			rcinput(document.input.say.value);
			document.input.say.value = "";
			
		}
	}
  //--><!]]></script>

</head>

<body onload="rcconnect()">
	<div id="container">
		<div id="history"></div>
		<div id="client">
			<div id="input">
				<form name="input" onsubmit="return false" autocomplete="off">
					<input id="say" onkeydown="return rckeydown(event)" autocomplete="off" autofocus="autofocus"></input>
				</form></div>
			<div id="status">&nbsp;</div>
		</div>
	</div>
</body>
</html>
Commit	Line	Data
827f21bb SW	1	<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
827f21bb SW	2	"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
827f21bb	3	<html xmlns="http://www.w3.org/1999/xhtml">
520c21fd SW	4	<!--
	5	reliable-chat - multipath chat
	6	Copyright (C) 2012 Scott Worley <sworley@chkno.net>
	7	Copyright (C) 2012 Jason Hibbs <skitch@gmail.com>
	8
	9	This program is free software: you can redistribute it and/or modify
	10	it under the terms of the GNU Affero General Public License as
	11	published by the Free Software Foundation, either version 3 of the
	12	License, or (at your option) any later version.
	13
	14	This program is distributed in the hope that it will be useful,
	15	but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	17	GNU Affero General Public License for more details.
	18
	19	You should have received a copy of the GNU Affero General Public License
	20	along with this program. If not, see <http://www.gnu.org/licenses/>.
	21	-->
827f21bb SW	22	<head>
827f21bb SW	23	<title>Reliable Chat</title>
0248a518	24	<style type="text/css"><!--/--><![CDATA[/><!--*/
70f46223 JH	25	html, body {
	26	width: 99.9%;
	27	height: 100%;
	28	margin: 0;
	29	padding: 0;
b22a2ced JH	30	background-color: #293134;
b22a2ced JH	31	color: silver;
70f46223 JH	32	font-family: monospace;
	33	}
	34	#container {
	35	height: 100%;
	36	}
	37	#status {
	38	width: 100%;
638866e9	39	text-align: right;
b22a2ced	40	background-color: #293134;
70f46223 JH	41	padding: 5px 5px 5px 0px;
	42	}
	43	#client {
	44	width: 98.5%;
	45	padding: 0px 0px 0px 5px;
	46	height: 50px;
	47	position: fixed;
	48	bottom: 0;
	49	}
	50	#input {
	51	width: 100%;
b22a2ced	52	background-color: #293134;
70f46223	53	}
0248a518	54	#say { width: 100% }
70f46223 JH	55	#history {
	56	padding: 0px 5px 55px 5px;
	57	vertical-align: bottom
	58	}
0248a518 SW	59	img { width: 1px; height: 1px; }
0248a518 SW	60	iframe { display: none }
70f46223	61	#status span { margin-right: 10px; }
f09c4ede JH	62	#status span.sad {
	63	background-color: #f00;
	64	color: #fff;
	65	border: 1px solid black;
	66	border-radius: 5px;
	67	padding-left: 5px;
	68	padding-right: 5px;
	69	}
	70	#status span.happy {
	71	background-color: #0f0;
	72	color: #000;
	73	border: 1px solid black;
	74	border-radius: 5px;
	75	padding-left: 5px;
	76	padding-right: 5px;
	77	}
0248a518 SW	78	/]]>/--></style>
	79	<script type="text/javascript"><!--//--><![CDATA[//><!--
	80	var servers = ['chkno.net', 'rc2.chkno.net', 'echto.net', 'the-wes.com', 'vibrantlogic.com'];
	81
da9ce2ab	82	var session = Math.random(); // For outgoing message IDs
869430fa SW	83	var since = {}; // server -> time: For fetch?since=
869430fa SW	84	var seen = {}; // seen_key -> message
7f54ca0a	85	var history = []; // List of messages sorted by Time
5419ea4c	86	// Messages have these fields:
40380bd3	87	// Time: The timestamp. Median of ServerTimes
5419ea4c SW	88	// ID: Some unique string for deduping
5419ea4c SW	89	// Text: The text of the message
705e26cf	90	// ServerTimes: server -> timestamp
5419ea4c	91	// UI: The DOM node for this message in the UI
0248a518 SW	92
	93	function rcnick() {
	94	var nick = localStorage.getItem("nick");
	95	if (nick) {
	96	return nick;
	97	}
	98	return 'anonymous';
	99	}
	100
	101	function rcsetnick(new_nick) {
	102	localStorage.setItem("nick", new_nick);
	103	}
	104
	105	function rcserverbase(server) {
	106	// Add the default port if server doesn't contain a port number already
	107	if (server.indexOf(":") == -1) {
	108	return "http://" + server + ":21059";
	109	} else {
	110	return "http://" + server;
	111	}
	112	}
	113
	114	function rcchangeserverstatus(server, new_status) {
	115	var statusbar = document.getElementById("status");
	116	var spans = statusbar.getElementsByTagName("span");
	117	for (var i in spans) {
	118	if (spans[i].firstChild && 'data' in spans[i].firstChild && spans[i].firstChild.data == server) {
	119	spans[i].setAttribute("class", new_status);
	120	}
	121	}
	122	}
	123
bd1ed9dd SW	124	function rcformattime(t) {
	125	var d = t.getDay();
	126	d = ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"][d];
	127	var h = t.getHours();
	128	var m = t.getMinutes();
	129	var s = t.getSeconds();
	130	function pad(x) {
	131	return (x < 10 ? "0" : "") + x;
	132	}
	133	return d + " " + pad(h) + ":" + pad(m) + ":" + pad(s);
	134	}
	135
0248a518	136	function rcaddmessagetohistory(message) {
7f54ca0a SW	137	var message_i;
	138	if (message.Time) {
	139	for (var i = history.length - 1; ; i--) {
	140	if (i < 0 \|\| (history[i].Time && message.Time >= history[i].Time)) {
	141	message_i = i+1;
	142	history.splice(message_i, 0, message);
	143	break;
	144	}
	145	}
	146	} else {
	147	history.push(message);
	148	message_i = history.length-1;
	149	}
	150
95ba71ee SW	151	if (!message.UI) {
	152	var text = (message.Time ? rcformattime(message.Time) : "") + " " + message.Text;
	153	message.UI = document.createElement("div");
	154	message.UI.appendChild(document.createTextNode(text));
	155	}
0248a518	156	var h = document.getElementById("history");
7f54ca0a SW	157	if (message_i + 1 < history.length) {
	158	h.insertBefore(message.UI, history[message_i + 1].UI);
	159	} else {
	160	h.appendChild(message.UI);
	161	}
0248a518	162	window.scrollTo(0, document.body.scrollHeight);
0248a518 SW	163	}
	164
	165	function make_seen_key(id, text) {
	166	return id.replace(/@/g, "@@") + "_@_" + text.replace(/@/g, "@@");
	167	}
	168
40380bd3 SW	169	function rcupdatemessagetime(message) {
	170	// Set message.Time to be the median of message.ServerTimes
	171	var times = [];
	172	for (var i in message.ServerTimes) {
	173	times.push(message.ServerTimes[i]);
	174	}
	175	times.sort();
40380bd3	176	if (times.length % 2) {
ac4bf273	177	message.Time = times[(times.length-1)/2];
40380bd3	178	} else {
ac4bf273	179	var middle = times.length/2;
40380bd3 SW	180	var difference = times[middle].getTime() - times[middle-1].getTime();
	181	message.Time = new Date(times[middle-1].getTime() + difference/2);
	182	}
95ba71ee SW	183
	184	// This may have broken history's in-sorted-order invariant
	185	var hi = history.indexOf(message);
	186	if ((history[hi-1] && history[hi-1].Time > message.Time) \|\|
	187	(history[hi+1] && history[hi+1].Time < message.Time)) {
	188	history.splice(hi,1);
	189	rcaddmessagetohistory(message);
	190	}
40380bd3 SW	191	}
40380bd3 SW	192
79ced6f1 SW	193	function rcreceivemessages(server, messages) {
79ced6f1 SW	194	for (var i in messages) {
ad35b1be	195	var m = messages[i];
bd1ed9dd	196	m.Time = new Date(m.Time);
ad35b1be	197	var seen_key = make_seen_key(m.ID, m.Text);
705e26cf SW	198	if (seen_key in seen) {
705e26cf SW	199	seen[seen_key].ServerTimes[server] = m.Time;
40380bd3	200	rcupdatemessagetime(seen[seen_key]);
705e26cf	201	} else {
16640c5d SW	202	m.ServerTimes = {};
16640c5d SW	203	m.ServerTimes[server] = m.Time;
869430fa	204	seen[seen_key] = m;
ad35b1be	205	rcaddmessagetohistory(m);
79ced6f1 SW	206	for (var i in servers) {
	207	rcchangeserverstatus(servers[i], "sad");
	208	}
0248a518	209	}
79ced6f1	210	rcchangeserverstatus(server, "happy");
0248a518	211	}
0248a518 SW	212	}
0248a518 SW	213
79ced6f1 SW	214	function rcfetch(server) {
	215	var delay = 10000; // TODO: Exponential backoff
	216	var xhr = new XMLHttpRequest();
	217	xhr.onreadystatechange = function() {
	218	if (this.readyState == this.DONE) {
	219	if (this.status == 200) {
	220	var rtxt = this.responseText;
	221	if (rtxt != null) {
	222	var messages = JSON.parse(rtxt);
	223	if (messages != null) {
79ced6f1 SW	224	delay = 40;
79ced6f1 SW	225	if (messages.length >= 1 && "Time" in messages[messages.length-1]) {
ad35b1be	226	since[server] = messages[messages.length-1].Time;
79ced6f1	227	}
92ca5f8a	228	rcreceivemessages(server, messages);
79ced6f1	229	}
0248a518 SW	230	}
0248a518 SW	231	}
79ced6f1	232	window.setTimeout(rcfetch, delay, server);
0248a518 SW	233	}
0248a518 SW	234	}
79ced6f1 SW	235	var uri = rcserverbase(server) + "/fetch";
	236	if (server in since) {
	237	uri += '?since="' + since[server] + '"';
	238	}
	239	xhr.open("GET", uri);
	240	xhr.send();
0248a518 SW	241	}
	242
	243	function rcconnect() {
0248a518	244	for (var i in servers) {
79ced6f1	245	rcfetch(servers[i]);
0248a518 SW	246	// Status bar entry
	247	var status_indicator = document.createElement("span");
	248	status_indicator.appendChild(document.createTextNode(servers[i]));
	249	status_indicator.setAttribute("class", "sad");
	250	document.getElementById("status").appendChild(status_indicator);
	251	}
0248a518 SW	252	}
	253
	254	function rcsend(d, message) {
7f54ca0a SW	255	message.ID = new Date().getTime() + "-" + session + "-" + Math.random();
7f54ca0a SW	256	seen[make_seen_key(message.ID, message.Text)] = message;
0248a518	257	var path = "/speak" +
7f54ca0a SW	258	"?id=" + encodeURIComponent(message.ID) +
7f54ca0a SW	259	"&text=" + encodeURIComponent(message.Text);
0248a518 SW	260	for (var i in servers) {
	261	var uri = rcserverbase(servers[i]) + path;
	262	var img = document.createElement("img");
	263	img.setAttribute("src", uri);
	264	d.appendChild(img);
	265	}
	266	}
	267
5a6c082a SW	268	function rcinput(input) {
	269	var message;
	270	var re = /^\/([a-z]+) (.*)/
	271	var match = re.exec(input);
	272	if (match && match[1] == 'me') {
	273	message = "* " + rcnick() + " " + match[2];
	274	} else if (match && match[1] == 'nick') {
	275	message = "*** " + rcnick() + " is now known as " + match[2];
	276	rcsetnick(match[2]);
	277	} else {
	278	message = "<" + rcnick() + "> " + input;
	279	}
	280
7f54ca0a	281	var m = {'Text': message, 'ServerTimes': {}};
869430fa SW	282	rcaddmessagetohistory(m);
869430fa SW	283	rcsend(m.UI, m);
5a6c082a SW	284	}
5a6c082a SW	285
0248a518 SW	286	function rckeydown(event) {
0248a518 SW	287	if (event.keyCode == 13) {
5a6c082a	288	rcinput(document.input.say.value);
0248a518 SW	289	document.input.say.value = "";
0248a518 SW	290
0248a518 SW	291	}
	292	}
	293	//--><!]]></script>
	294
827f21bb SW	295	</head>
827f21bb SW	296
f0e385c7	297	<body onload="rcconnect()">
70f46223 JH	298	<div id="container">
	299	<div id="history"></div>
	300	<div id="client">
	301	<div id="input">
	302	<form name="input" onsubmit="return false" autocomplete="off">
	303	<input id="say" onkeydown="return rckeydown(event)" autocomplete="off" autofocus="autofocus"></input>
	304	</form></div>
	305	<div id="status"> </div>
	306	</div>
	307	</div>
827f21bb SW	308	</body>
827f21bb SW	309	</html>