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1<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
2 "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
3<html xmlns="http://www.w3.org/1999/xhtml">
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-->
22<head>
23 <title>Reliable Chat</title>
24 <style type="text/css"><!--/*--><![CDATA[/*><!--*/
25 html, body {
26 width: 99.9%;
27 height: 100%;
28 margin: 0;
29 padding: 0;
30 background-color: #293134;
31 color: silver;
32 font-family: monospace;
33 }
34 a {
35 color: white;
36 }
37 #container {
38 height: 100%;
39 }
40 #status {
41 width: 100%;
42 text-align: right;
43 background-color: #293134;
44 padding: 5px 5px 5px 0px;
45 }
46 #client {
47 width: 98.5%;
48 padding: 0px 0px 0px 5px;
49 height: 50px;
50 position: fixed;
51 bottom: 0;
52 }
53 #input {
54 width: 100%;
55 background-color: #293134;
56 }
57 #say { width: 100% }
58 #history {
59 padding: 0px 5px 55px 5px;
60 vertical-align: bottom
61 }
62 .servercount {
63 margin-right: 0.5em;
64 font-size: 70%;
65 }
66 .timestamp {
67 margin-right: 0.8em;
68 }
69 .timestamp:hover, .timestamp:hover .servertimestamps {
70 background-color: #556;
71 }
72 .timestamp:hover .servertimestamps {
73 display: block;
74 }
75 .servertimestamps {
76 display: none;
77 position: absolute;
78 left: 3em;
79 z-index: 1;
80 border: 1px solid black;
81 border-radius: 5px;
82 padding-left: 5px;
83 padding-right: 5px;
84 }
85 img { width: 1px; height: 1px; }
86 iframe { display: none }
87 #status span { margin-right: 10px; }
88 #status span.sad {
89 background-color: #f00;
90 color: #fff;
91 border: 1px solid black;
92 border-radius: 5px;
93 padding-left: 5px;
94 padding-right: 5px;
95 }
96 #status span.happy {
97 background-color: #0f0;
98 color: #000;
99 border: 1px solid black;
100 border-radius: 5px;
101 padding-left: 5px;
102 padding-right: 5px;
103 }
104 /*]]>*/--></style>
105 <script type="text/javascript"><!--//--><![CDATA[//><!--
106 var servers = ['chkno.net', 'rc2.chkno.net', 'echto.net', 'the-wes.com', 'vibrantlogic.com'];
107
108 var session = Math.random(); // For outgoing message IDs
109 var since = {}; // server -> time: For fetch?since=
110 var seen = {}; // seen_key -> message
111 var history = []; // List of messages sorted by Time
112 // Messages have these fields:
113 // Time: The timestamp. Median of ServerTimes
114 // ID: Some unique string for deduping
115 // Text: The text of the message
116 // ServerTimes: server -> timestamp
117 // UI: The DOM node for this message in the UI
118
119 function rcnick() {
120 var nick = localStorage.getItem("nick");
121 if (nick) {
122 return nick;
123 }
124 return 'anonymous';
125 }
126
127 function rcsetnick(new_nick) {
128 localStorage.setItem("nick", new_nick);
129 }
130
131 function rcserverbase(server) {
132 // Add the default port if server doesn't contain a port number already
133 if (server.indexOf(":") == -1) {
134 return "http://" + server + ":21059";
135 } else {
136 return "http://" + server;
137 }
138 }
139
140 function rcchangeserverstatus(server, new_status) {
141 var statusbar = document.getElementById("status");
142 var spans = statusbar.getElementsByTagName("span");
143 for (var i in spans) {
144 if (spans[i].firstChild && 'data' in spans[i].firstChild && spans[i].firstChild.data == server) {
145 spans[i].setAttribute("class", new_status);
146 }
147 }
148 }
149
150 function rcpad2(x) {
151 return (x < 10 ? "0" : "") + x;
152 }
153 function rcpad3(x) {
154 return (x < 10 ? "00" : (x < 100 ? "0" : "")) + x;
155 }
156
157 function rcformattime(t) {
158 var d = t.getDay();
159 d = ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"][d];
160 var h = t.getHours();
161 var m = t.getMinutes();
162 var s = t.getSeconds();
163 return d + " " + rcpad2(h) + ":" + rcpad2(m) + ":" + rcpad2(s);
164 }
165
166 function rcaddservertimestamptohover(message, server) {
167 var divs = message.UI.getElementsByTagName("div");
168 var t = message.ServerTimes[server];
169 for (var i in divs) {
170 if (divs[i].getAttribute && divs[i].getAttribute("class") == "servertimestamps") {
171 var d = document.createElement("div");
172 var text = t.getFullYear() + "-" +
173 rcpad2(t.getMonth()) + "-" +
174 rcpad2(t.getDay()) + " " +
175 rcformattime(t) + "." +
176 rcpad3(t.getMilliseconds()) + " " +
177 server;
178 d.appendChild(document.createTextNode(text));
179 divs[i].appendChild(d);
180 }
181 }
182 }
183
184 function rcmakemessageUI(message) {
185 message.UI = document.createElement("div");
186
187 // Server count
188 var servercount = document.createElement("span");
189 servercount.setAttribute("class", "servercount");
190 servercount.appendChild(document.createTextNode(Object.keys(message.ServerTimes).length));
191 message.UI.appendChild(servercount);
192
193 // Timestamp
194 var timestamp_text = message.Time ? rcformattime(message.Time) : "";
195 var timestamp = document.createElement("span");
196 timestamp.setAttribute("class", "timestamp");
197 timestamp.appendChild(document.createTextNode(timestamp_text));
198 message.UI.appendChild(timestamp);
199
200 // Timestamp hover
201 var timestamp_hover = document.createElement("div");
202 timestamp_hover.setAttribute("class", "servertimestamps");
203 timestamp.appendChild(timestamp_hover);
204 for (var server in message.ServerTimes) {
205 rcaddservertimestamptohover(message, server);
206 }
207
208 // Classify different message types
209 var text_span = document.createElement("span");
210 var type;
211 if (/^\*\*\* /.test(message.Text)) {
212 type = "status";
213 } else if (/^\* /.test(message.Text)) {
214 type = "me";
215 } else {
216 type = "text";
217 }
218 if (Object.keys(message.ServerTimes).length == 0) {
219 type += " self";
220 }
221 text_span.setAttribute("class", type);
222
223 // URL detection
224 var text = message.Text;
225 var URL_re = /\bhttps?:\/\/\S+/;
226 while (URL_re.test(text)) {
227 var match = URL_re.exec(text);
228 var leading_text = text.substr(0, match.index);
229 if (leading_text) {
230 text_span.appendChild(document.createTextNode(leading_text));
231 }
232 var anchor = document.createElement("a");
233 anchor.setAttribute("rel", "nofollow");
234 anchor.setAttribute("href", encodeURI(match[0]));
235 anchor.appendChild(document.createTextNode(match[0]));
236 text_span.appendChild(anchor);
237 text = text.substr(match.index + match[0].length);
238 }
239 if (text) {
240 text_span.appendChild(document.createTextNode(text));
241 }
242
243 message.UI.appendChild(text_span);
244 }
245
246 function rcaddmessagetohistory(message) {
247 var message_i;
248 if (message.Time) {
249 for (var i = history.length - 1; ; i--) {
250 if (i < 0 || (history[i].Time && message.Time >= history[i].Time)) {
251 message_i = i+1;
252 history.splice(message_i, 0, message);
253 break;
254 }
255 }
256 } else {
257 history.push(message);
258 message_i = history.length-1;
259 }
260
261 if (!message.UI) {
262 rcmakemessageUI(message);
263 }
264 var h = document.getElementById("history");
265 if (message_i + 1 < history.length) {
266 h.insertBefore(message.UI, history[message_i + 1].UI);
267 } else {
268 h.appendChild(message.UI);
269 }
270 window.scrollTo(0, document.body.scrollHeight);
271 }
272
273 function make_seen_key(id, text) {
274 return id.replace(/@/g, "@@") + "_@_" + text.replace(/@/g, "@@");
275 }
276
277 function rcupdatemessagetime(message) {
278 // Set message.Time to be the median of message.ServerTimes
279 var times = [];
280 for (var i in message.ServerTimes) {
281 times.push(message.ServerTimes[i]);
282 }
283 times.sort();
284 if (times.length % 2) {
285 message.Time = times[(times.length-1)/2];
286 } else {
287 var middle = times.length/2;
288 var difference = times[middle].getTime() - times[middle-1].getTime();
289 message.Time = new Date(times[middle-1].getTime() + difference/2);
290 }
291
292 // This may have broken history's in-sorted-order invariant
293 var hi = history.indexOf(message);
294 if ((history[hi-1] && history[hi-1].Time > message.Time) ||
295 (history[hi+1] && history[hi+1].Time < message.Time)) {
296 history.splice(hi,1);
297 rcaddmessagetohistory(message);
298 }
299
300 // Update the UI
301 var spans = message.UI.getElementsByTagName("span");
302 for (var i in spans) {
303 if (spans[i].getAttribute) {
304 var type = spans[i].getAttribute("class");
305 if (type == "servercount") {
306 spans[i].firstChild.data = Object.keys(message.ServerTimes).length;
307 } else if (type == "timestamp") {
308 spans[i].firstChild.data = rcformattime(message.Time);
309 }
310 }
311 }
312 }
313
314 function rcreceivemessages(server, messages) {
315 for (var i in messages) {
316 var m = messages[i];
317 m.Time = new Date(m.Time);
318 var seen_key = make_seen_key(m.ID, m.Text);
319 if (seen_key in seen) {
320 seen[seen_key].ServerTimes[server] = m.Time;
321 rcupdatemessagetime(seen[seen_key]);
322 rcaddservertimestamptohover(seen[seen_key], server);
323 } else {
324 m.ServerTimes = {};
325 m.ServerTimes[server] = m.Time;
326 seen[seen_key] = m;
327 rcaddmessagetohistory(m);
328 for (var i in servers) {
329 rcchangeserverstatus(servers[i], "sad");
330 }
331 }
332 rcchangeserverstatus(server, "happy");
333 }
334 }
335
336 function rcfetch(server) {
337 var delay = 10000; // TODO: Exponential backoff
338 var xhr = new XMLHttpRequest();
339 xhr.onreadystatechange = function() {
340 if (this.readyState == this.DONE) {
341 if (this.status == 200) {
342 var rtxt = this.responseText;
343 if (rtxt != null) {
344 var messages = JSON.parse(rtxt);
345 if (messages != null) {
346 delay = 40;
347 if (messages.length >= 1 && "Time" in messages[messages.length-1]) {
348 since[server] = messages[messages.length-1].Time;
349 }
350 rcreceivemessages(server, messages);
351 }
352 }
353 }
354 window.setTimeout(rcfetch, delay, server);
355 }
356 }
357 var uri = rcserverbase(server) + "/fetch";
358 if (server in since) {
359 uri += '?since="' + since[server] + '"';
360 }
361 xhr.open("GET", uri);
362 xhr.send();
363 }
364
365 function rcconnect() {
366 for (var i in servers) {
367 rcfetch(servers[i]);
368 // Status bar entry
369 var status_indicator = document.createElement("span");
370 status_indicator.appendChild(document.createTextNode(servers[i]));
371 status_indicator.setAttribute("class", "sad");
372 document.getElementById("status").appendChild(status_indicator);
373 }
374 }
375
376 function rcsend(d, message) {
377 message.ID = new Date().getTime() + "-" + session + "-" + Math.random();
378 seen[make_seen_key(message.ID, message.Text)] = message;
379 var path = "/speak" +
380 "?id=" + encodeURIComponent(message.ID) +
381 "&text=" + encodeURIComponent(message.Text);
382 for (var i in servers) {
383 var uri = rcserverbase(servers[i]) + path;
384 var img = document.createElement("img");
385 img.setAttribute("src", uri);
386 d.appendChild(img);
387 }
388 }
389
390 function rcinput(input) {
391 var message;
392 var re = /^\/([a-z]+) (.*)/
393 var match = re.exec(input);
394 if (match && match[1] == 'me') {
395 message = "* " + rcnick() + " " + match[2];
396 } else if (match && match[1] == 'nick') {
397 message = "*** " + rcnick() + " is now known as " + match[2];
398 rcsetnick(match[2]);
399 } else {
400 message = "<" + rcnick() + "> " + input;
401 }
402
403 var m = {'Text': message, 'ServerTimes': {}};
404 rcaddmessagetohistory(m);
405 rcsend(m.UI, m);
406 }
407
408 function rckeydown(event) {
409 if (event.keyCode == 13) {
410 rcinput(document.input.say.value);
411 document.input.say.value = "";
412
413 }
414 }
415 //--><!]]></script>
416
417</head>
418
419<body onload="rcconnect()">
420 <div id="container">
421 <div id="history"></div>
422 <div id="client">
423 <div id="input">
424 <form name="input" onsubmit="return false" autocomplete="off">
425 <input id="say" onkeydown="return rckeydown(event)" autocomplete="off" autofocus="autofocus"></input>
426 </form></div>
427 <div id="status">&nbsp;</div>
428 </div>
429 </div>
430</body>
431</html>