VersaWhiteboard/scripts/server-backend.js

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const { getArgs } = require("./utils");
const path = require("path");
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function startBackendServer(port) {
var accessToken = ""; //Can be set here or as start parameter (node server.js --accesstoken=MYTOKEN)
var disableSmallestScreen = false; //Can be set to true if you dont want to show (node server.js --disablesmallestscreen=true)
var webdav = false; //Can be set to true if you want to allow webdav save (node server.js --webdav=true)
var fs = require("fs-extra");
var express = require('express');
var formidable = require('formidable'); //form upload processing
const createDOMPurify = require('dompurify'); //Prevent xss
const { JSDOM } = require('jsdom');
const window = (new JSDOM('')).window;
const DOMPurify = createDOMPurify(window);
const { createClient } = require("webdav");
var s_whiteboard = require("./s_whiteboard.js");
var app = express();
app.use(express.static(path.join(__dirname, '..', 'dist')));
app.use("/uploads", express.static(path.join(__dirname, '..', 'public', 'uploads')));
var server = require('http').Server(app);
server.listen(port);
var io = require('socket.io')(server, {path: "/ws-api", });
console.log("Webserver & socketserver running on port:" + port);
if (process.env.accesstoken) {
accessToken = process.env.accesstoken;
}
if (process.env.disablesmallestscreen) {
disablesmallestscreen = true;
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}
if (process.env.webdav) {
webdav = true;
}
var startArgs = getArgs();
if (startArgs["accesstoken"]) {
accessToken = startArgs["accesstoken"];
}
if (startArgs["disablesmallestscreen"]) {
disableSmallestScreen = true;
}
if (startArgs["webdav"]) {
webdav = true;
}
if (accessToken !== "") {
console.log("AccessToken set to: " + accessToken);
}
if (disableSmallestScreen) {
console.log("Disabled showing smallest screen resolution!");
}
if (webdav) {
console.log("Webdav save is enabled!");
}
app.get('/api/loadwhiteboard', function (req, res) {
var wid = req["query"]["wid"];
var at = req["query"]["at"]; //accesstoken
if (accessToken === "" || accessToken == at) {
var ret = s_whiteboard.loadStoredData(wid);
res.send(ret);
res.end();
} else {
res.status(401); //Unauthorized
res.end();
}
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});
app.post('/api/upload', function (req, res) { //File upload
var form = new formidable.IncomingForm(); //Receive form
var formData = {
files: {},
fields: {}
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}
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 () {
if (accessToken === "" || accessToken == formData["fields"]["at"]) {
progressUploadFormData(formData, function (err) {
if (err) {
if (err == "403") {
res.status(403);
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} else {
res.status(500);
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}
res.end();
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} else {
res.send("done");
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}
});
} else {
res.status(401); //Unauthorized
res.end();
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}
//End file upload
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});
form.parse(req);
});
function progressUploadFormData(formData, callback) {
console.log("Progress new Form Data");
var fields = escapeAllContentStrings(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";
var webdavaccess = fields["webdavaccess"] || false;
try {
webdavaccess = JSON.parse(webdavaccess);
} catch (e) {
webdavaccess = false;
}
fs.ensureDir("./public/uploads", function (err) {
if (err) {
console.log("Could not create upload folder!", err);
return;
}
var imagedata = fields["imagedata"];
if (imagedata && imagedata != "") { //Save from base64 data
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);
callback(err);
} else {
if (webdavaccess) { //Save image to webdav
if (webdav) {
saveImageToWebdav('./public/uploads/' + filename, filename, webdavaccess, function (err) {
if (err) {
console.log("error", err);
callback(err);
} else {
callback();
}
})
} else {
callback("Webdav is not enabled on the server!");
}
} else {
callback();
}
}
});
} else {
callback("no imagedata!");
console.log("No image Data found for this upload!", name);
}
});
}
function saveImageToWebdav(imagepath, filename, webdavaccess, callback) {
if (webdavaccess) {
var webdavserver = webdavaccess["webdavserver"] || "";
var webdavpath = webdavaccess["webdavpath"] || "/";
var webdavusername = webdavaccess["webdavusername"] || "";
var webdavpassword = webdavaccess["webdavpassword"] || "";
const client = createClient(
webdavserver,
{
username: webdavusername,
password: webdavpassword
}
)
client.getDirectoryContents(webdavpath).then((items) => {
var cloudpath = webdavpath+ '' + filename;
console.log("webdav saving to:", cloudpath);
fs.createReadStream(imagepath).pipe(client.createWriteStream(cloudpath));
callback();
}).catch((error) => {
callback("403");
console.log("Could not connect to webdav!")
});
} else {
callback("Error: no access data!")
}
}
var smallestScreenResolutions = {};
io.on('connection', function (socket) {
var whiteboardId = null;
socket.on('disconnect', function () {
if (smallestScreenResolutions && smallestScreenResolutions[whiteboardId] && socket && socket.id) {
delete smallestScreenResolutions[whiteboardId][socket.id];
}
socket.compress(false).volatile.broadcast.emit('refreshUserBadges', null); //Removes old user Badges
sendSmallestScreenResolution();
});
socket.on('drawToWhiteboard', function (content) {
content = escapeAllContentStrings(content);
if (accessToken === "" || accessToken == content["at"]) {
socket.compress(false).volatile.broadcast.to(whiteboardId).emit('drawToWhiteboard', content); //Send to all users in the room (not own socket)
s_whiteboard.handleEventsAndData(content); //save whiteboardchanges on the server
} else {
socket.emit('wrongAccessToken', true);
}
});
socket.on('joinWhiteboard', function (content) {
content = escapeAllContentStrings(content);
if (accessToken === "" || accessToken == content["at"]) {
whiteboardId = content["wid"];
socket.join(whiteboardId); //Joins room name=wid
smallestScreenResolutions[whiteboardId] = smallestScreenResolutions[whiteboardId] ? smallestScreenResolutions[whiteboardId] : {};
smallestScreenResolutions[whiteboardId][socket.id] = content["windowWidthHeight"] || { w: 10000, h: 10000 };
sendSmallestScreenResolution();
} else {
socket.emit('wrongAccessToken', true);
}
});
socket.on('updateScreenResolution', function (content) {
content = escapeAllContentStrings(content);
if (smallestScreenResolutions[whiteboardId] && (accessToken === "" || accessToken == content["at"])) {
smallestScreenResolutions[whiteboardId][socket.id] = content["windowWidthHeight"] || { w: 10000, h: 10000 };
sendSmallestScreenResolution();
}
});
function sendSmallestScreenResolution() {
if (disableSmallestScreen) {
return;
}
var smallestWidth = 10000;
var smallestHeight = 10000;
for (var i in smallestScreenResolutions[whiteboardId]) {
smallestWidth = smallestWidth > smallestScreenResolutions[whiteboardId][i]["w"] ? smallestScreenResolutions[whiteboardId][i]["w"] : smallestWidth;
smallestHeight = smallestHeight > smallestScreenResolutions[whiteboardId][i]["h"] ? smallestScreenResolutions[whiteboardId][i]["h"] : smallestHeight;
}
io.to(whiteboardId).emit('updateSmallestScreenResolution', { w: smallestWidth, h: smallestHeight });
}
});
//Prevent cross site scripting (xss)
function escapeAllContentStrings(content, cnt) {
if (!cnt)
cnt = 0;
if (typeof (content) === "string") {
return DOMPurify.sanitize(content);
}
for (var i in content) {
if (typeof (content[i]) === "string") {
content[i] = DOMPurify.sanitize(content[i]);
} if (typeof (content[i]) === "object" && cnt < 10) {
content[i] = escapeAllContentStrings(content[i], ++cnt);
}
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}
return content;
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}
process.on('unhandledRejection', error => {
// Will print "unhandledRejection err is not defined"
console.log('unhandledRejection', error.message);
})
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}
module.exports = startBackendServer;