VersaWhiteboard/server.js

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JavaScript
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var PORT = 8080; //Set port for the app
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fs = require("fs-extra");
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var express = require('express');
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var formidable = require('formidable'); //form upload processing
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var s_whiteboard = require("./s_whiteboard.js");
var app = express();
app.use(express.static(__dirname + '/public'));
var server = require('http').Server(app);
server.listen(PORT);
var io = require('socket.io')(server);
console.log("Webserver & socketserver running on port:"+PORT);
app.get('/loadwhiteboard', function(req, res) {
var wid = req["query"]["wid"];
var ret = s_whiteboard.loadStoredData(wid);
res.send(ret);
res.end();
});
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app.post('/upload', function(req, res) { //File upload
var form = new formidable.IncomingForm(); //Receive form
var formData = {
files : {},
fields : {}
}
form.on('file', function(name, file) {
formData["files"][file.name] = file;
});
form.on('field', function(name, value) {
formData["fields"][name] = value;
});
form.on('error', function(err) {
console.log('File uplaod Error!');
});
form.on('end', function() {
progressUploadFormData(formData);
res.send("done");
//End file upload
});
form.parse(req);
});
function progressUploadFormData(formData) {
console.log("Progress new Form Data");
var fields = formData.fields;
var files = formData.files;
var whiteboardId = fields["whiteboardId"];
var name = fields["name"] || "";
var date = fields["date"] || (+new Date());
var filename = whiteboardId+"_"+date+".png";
fs.ensureDir("./public/uploads", function(err) {
var imagedata = fields["imagedata"];
if(imagedata && imagedata != "") { //Save from base64
imagedata = imagedata.replace(/^data:image\/png;base64,/, "").replace(/^data:image\/jpeg;base64,/, "");
console.log(filename, "uploaded");
fs.writeFile('./public/uploads/'+filename, imagedata, 'base64', function(err) {
if(err) {
console.log("error", err);
}
});
}
});
}
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var allUsers = {};
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io.on('connection', function(socket){
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socket.on('disconnect', function () {
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delete allUsers[socket.id];
socket.broadcast.emit('refreshUserBadges', null);
});
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socket.on('drawToWhiteboard', function(content) {
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content = escapeAllContentStrings(content);
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sendToAllUsersOfWhiteboard(content["wid"], content)
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s_whiteboard.handleEventsAndData(content); //save whiteboardchanges on the server
});
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socket.on('joinWhiteboard', function(wid) {
allUsers[socket.id] = {
"socket" : socket,
"wid" : wid
};
});
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});
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function sendToAllUsersOfWhiteboard(wid, content) {
for(var i in allUsers) {
if(allUsers[i]["wid"]==wid) {
allUsers[i]["socket"].emit('drawToWhiteboard', content);
}
}
}
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//Prevent cross site scripting
function escapeAllContentStrings(content, cnt) {
if(!cnt)
cnt = 0;
if(typeof(content)=="string") {
return content.replace(/<\/?[^>]+(>|$)/g, "");
}
for(var i in content) {
if(typeof(content[i])=="string") {
content[i] = content[i].replace(/<\/?[^>]+(>|$)/g, "");
} if(typeof(content[i])=="object" && cnt < 10) {
content[i] = escapeAllContentStrings(content[i], ++cnt);
}
}
return content;
}