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Fetch with direct cross-origin XMLHttpRequests
[reliable-chat] / webclient / rc.html
1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
2 "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
3
4 <html xmlns="http://www.w3.org/1999/xhtml">
5 <head>
6 <title>Reliable Chat</title>
7 <style type="text/css"><!--/*--><![CDATA[/*><!--*/
8 html, body, #outer-table, #history { width: 99.9%; height: 100%; margin: 0; padding: 0 }
9 #status { background-color: #eef }
10 #say { width: 100% }
11 #history { vertical-align: bottom }
12 img { width: 1px; height: 1px; }
13 iframe { display: none }
14 #status span { margin-right: 2em }
15 #status span.sad { background-color: #fee }
16 #status span.happy { background-color: #efe }
17 /*]]>*/--></style>
18 <script type="text/javascript"><!--//--><![CDATA[//><!--
19 var servers = ['chkno.net', 'rc2.chkno.net', 'echto.net', 'the-wes.com', 'vibrantlogic.com'];
20
21 var session = Math.random();
22 var since = {};
23 var seen = {};
24
25 function rcnick() {
26 var nick = localStorage.getItem("nick");
27 if (nick) {
28 return nick;
29 }
30 return 'anonymous';
31 }
32
33 function rcsetnick(new_nick) {
34 localStorage.setItem("nick", new_nick);
35 }
36
37 function rcserverbase(server) {
38 // Add the default port if server doesn't contain a port number already
39 if (server.indexOf(":") == -1) {
40 return "http://" + server + ":21059";
41 } else {
42 return "http://" + server;
43 }
44 }
45
46 function rcchangeserverstatus(server, new_status) {
47 var statusbar = document.getElementById("status");
48 var spans = statusbar.getElementsByTagName("span");
49 for (var i in spans) {
50 if (spans[i].firstChild && 'data' in spans[i].firstChild && spans[i].firstChild.data == server) {
51 spans[i].setAttribute("class", new_status);
52 }
53 }
54 }
55
56 function rcaddmessagetohistory(message) {
57 var d = document.createElement("div");
58 d.appendChild(document.createTextNode(message));
59 var h = document.getElementById("history");
60 h.appendChild(d);
61 window.scrollTo(0, document.body.scrollHeight);
62 return d;
63 }
64
65 function make_seen_key(id, text) {
66 return id.replace(/@/g, "@@") + "_@_" + text.replace(/@/g, "@@");
67 }
68
69 function rcreceivemessages(server, messages) {
70 for (var i in messages) {
71 var seen_key = make_seen_key(messages[i]['ID'], messages[i]['Text']);
72 if (!(seen_key in seen)) {
73 seen[seen_key] = true;
74 rcaddmessagetohistory(messages[i]['Text']);
75 for (var i in servers) {
76 rcchangeserverstatus(servers[i], "sad");
77 }
78 }
79 rcchangeserverstatus(server, "happy");
80 }
81 }
82
83 function rcfetch(server) {
84 var delay = 10000; // TODO: Exponential backoff
85 var xhr = new XMLHttpRequest();
86 xhr.onreadystatechange = function() {
87 if (this.readyState == this.DONE) {
88 if (this.status == 200) {
89 var rtxt = this.responseText;
90 if (rtxt != null) {
91 var messages = JSON.parse(rtxt);
92 if (messages != null) {
93 rcreceivemessages(server, messages);
94 window.parent.postMessage(rtxt, "*");
95 delay = 40;
96 if (messages.length >= 1 && "Time" in messages[messages.length-1]) {
97 since[server] = messages[messages.length-1]["Time"];
98 }
99 }
100 }
101 }
102 window.setTimeout(rcfetch, delay, server);
103 }
104 }
105 var uri = rcserverbase(server) + "/fetch";
106 if (server in since) {
107 uri += '?since="' + since[server] + '"';
108 }
109 xhr.open("GET", uri);
110 xhr.send();
111 }
112
113 function rcconnect() {
114 for (var i in servers) {
115 rcfetch(servers[i]);
116 // Status bar entry
117 var status_indicator = document.createElement("span");
118 status_indicator.appendChild(document.createTextNode(servers[i]));
119 status_indicator.setAttribute("class", "sad");
120 document.getElementById("status").appendChild(status_indicator);
121 }
122 if (rcnick() == 'anonymous') {
123 rcaddmessagetohistory("-!- Set your nick with /nick");
124 }
125 }
126
127 function rcsend(d, message) {
128 var id = new Date().getTime() + "-" + session + "-" + Math.random();
129 seen[make_seen_key(id, message)] = true;
130 var path = "/speak" +
131 "?id=" + encodeURIComponent(id) +
132 "&text=" + encodeURIComponent(message);
133 for (var i in servers) {
134 var uri = rcserverbase(servers[i]) + path;
135 var img = document.createElement("img");
136 img.setAttribute("src", uri);
137 d.appendChild(img);
138 }
139 }
140
141 function rckeydown(event) {
142 if (event.keyCode == 13) {
143 var input = document.input.say.value;
144 document.input.say.value = "";
145
146 // Check nick change
147 var message;
148 var re = /^\/nick (.*)/;
149 var match = re.exec(input);
150 if (match) {
151 message = "*** " + rcnick() + " is now known as " + match[1];
152 rcsetnick(match[1]);
153 } else {
154 message = "<" + rcnick() + "> " + input;
155 }
156
157 // Say the message
158 var d = rcaddmessagetohistory(message);
159 rcsend(d, message);
160
161 // Remind people to set their nick
162 if (rcnick() == 'anonymous') {
163 rcaddmessagetohistory("-!- Set your nick with /nick");
164 }
165 }
166 }
167 //--><!]]></script>
168
169 </head>
170
171 <body onload="rcconnect()">
172 <table id="outer-table">
173 <tr><td id="history"></td></tr>
174 <tr><td id="status">&nbsp;</td></tr>
175 <tr><td><form name="input" onsubmit="return false" autocomplete="off">
176 <input id="say" onkeydown="return rckeydown(event)" autocomplete="off"></input>
177 </form></td></tr>
178 </table>
179 </body>
180 </html>