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server.js
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server.js
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// Copyright 2012 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
var WebSocket = require('faye-websocket');
var http = require('http');
var fs = require('fs');
// TODO: pickup from environment?
var HOSTROOEXP = '.localtunnel.net:8080';
var PORT = 8080;
var server = http.createServer();
function L() {
if (console && console.log) {
console.log.apply(console, arguments);
}
}
var files = {
'client/mirror.html': ['/mirror.html', 'text/html', null],
'client/mirror.js': ['/mirror.js', 'text/javascript', null],
'client/jquery-1.9.1.min.js': ['/jquery-1.9.1.min.js', 'text/javascript', null],
'client/app.js': ['/app.js', 'text/javascript', null],
'client/app.css': ['/app.css', 'text/css', null],
'client/cursor.png': ['/cursor.png', 'image/png', null],
'extension/tree_mirror.js': ['/tree_mirror.js', 'text/javascript', null]
};
// TODO: if this doesn't finish before server gets a request, then we
// might have a problem.
for (var file in files) {
(function (f) {
fs.readFile(f, function (err, content) {
files[f][2] = content;
L('read file - ' + f);
});
})(file);
}
fs.readFile('client/index.html', function (err, indexHTML) {
server.addListener('request', function (request, response) {
for (var f in files) {
if (request.url == files[f][0]) {
response.writeHead(200, {'Content-Type': files[f][1]});
response.end(files[f][2]);
return;
}
}
if (request.url == '/' || request.url == '/index.html') {
response.writeHead(200, {'Content-Type': 'text/html'});
if (! request.headers.host) {
return;
}
L("host - ", request.headers.host, request.headers.host.split(":")[0]);
response.end((indexHTML+"").replace("{{host}}", request.headers.host.split(":")[0]));
return;
}
L('Unknown resource: ' + request.url);
});
});
var projectors = [];
server.addListener('upgrade', function(request, rawsocket, head) {
var socket = new WebSocket(request, rawsocket, head);
var id = "",
proj;
if (request.headers.host) {
id = request.headers.host.replace(HOSTROOEXP, '');
}
L("host: ", request.headers.host);
// Projector.
if (request.url == '/projector') {
L('PROJ: connection initiating.', id);
if (projectors[id]) {
projectors[id].messages.length = 0;
} else {
projectors[id] = {messages: [], receivers: []};
}
proj = projectors[id];
L("PROJ: receiver cnt: ", proj.receivers.length);
proj.projector = socket;
proj.messages.push(JSON.stringify({ clear: true }));
proj.receivers.forEach(function(socket) {
socket.send(proj.messages[0]);
});
socket.onmessage = function(event) {
// L('PROJ: message received. now at ' +
// proj.messages.length +
// ' . sending to ' + proj.receivers.length);
proj.receivers.forEach(function(receiver) {
receiver.send(event.data);
});
proj.messages.push(event.data);
};
socket.onclose = function() {
L('PROJ: projector closing, clearing messages');
proj.messages.length = 0;
};
L('PROJ: projector open completed.');
return;
}
// Receivers.
if (request.url == '/receiver') {
L("RECV: receiver for id: ", id);
if (!projectors[id]) {
projectors[id] = {messages: [], receivers: []};
}
proj = projectors[id];
proj.receivers.push(socket);
L('RECV: receiver opened. now at ' + proj.receivers.length +
' sending ' + proj.messages.length + ' messages');
socket.send(JSON.stringify(proj.messages));
socket.onclose = function() {
var index = proj.receivers.indexOf(socket);
proj.receivers.splice(index, 1);
L('RECV: closed. now at ' + proj.receivers.length);
};
}
});
// TODO: get the port from console
server.listen(PORT);
L("Server started on port " + PORT);