app_annotator.js

//This is the server for working on models
//Users on this server have full access to 

const port = 4000;
const authentication = "password"; //Must be entered when trying to safe changes on the site
const fileWhitelist = ["models","arrowBack.png","favicon.ico","folderIcon.png", "loading.webp", "script_for_annotator.js", "scripta.js", "scriptf.js","style.css"]
//Whitelist only on the same level, directories that are mentioned here are fully accessible. Only fileindex and index.html are always included 

const http = require('http');
const fs = require('fs');
const qs = require('querystring');
//var path = require('path');
var index;

var indexFile = fs.readFile("./fileindex.txt", 'utf-8', function(errori, resindex) {
  //console.log(resindex);
  index = resindex;
  //console.log(index);
});

fs.readFile('./index_annotator.html', function(error, html) {
  if (error) throw error;
  console.log("Server started: Annotator");
  http.createServer((req, res) => {
    const { method, url } = req;
    
    var opt = {
      host: url.split("?")[0],
      param: url.split("?")[1]
    };
    console.log(method, opt.host);
    
    //When receiving annotations, delete this part when porting to explore3d
    if (method === "POST") {
      //console.log(opt.param);
      var body = '';
      var auth = "";
      req.on('data', chunk => {
        //console.log('A chunk of data has arrived: ', chunk, typeof chunk[0]);
        for (n in chunk) {
          if (typeof chunk[n] === "number") {
            body = body + String.fromCharCode(chunk[n]);
            //process.stdout.write(String.fromCharCode(chunk[n]));
          }
        }
      });
      req.on('end', () => {
        //console.log(body);
        path = getAnnoPath(opt.param.substr(2));
        if (req.headers["authentication"] === authentication) {// Check authentication
          fs.writeFile(path, body.substr(0, body.length-1), (err) => {
            if (err) {
              console.error(err);
            }});
          console.log("pushing annotation change successfull")
          res.writeHeader(204);
        } else {
          console.log("pushing annotation change tried but failed");
          res.writeHeader(401);
        }
        res.end();
      })
    }

    //Keep this when porting to explore3d vv
    //index.html bzw Home
    else if (opt.host === "/") {
      res.writeHeader(200, {"Content-Type": "text/html"});
      res.write(html);
      res.end();
      //console.log("Base HTML sent");
      return;
    }
    else if (opt.host === "/fileindex") {
      res.writeHeader(200, {"Content-Type": "application/json"});
      //console.log(index);
      res.write(index);
      res.end();
      //console.log("Index sent");
      return;
    }
    else if (opt.host.substr(opt.host.length-15) === "annotations.txt") {
      //console.log("annotations requested: " + opt.host);
      fs.readFile("." + opt.host, "utf-8", (errora, resa)=> {
        res.writeHeader(200, {"Content-Type": "application/json"});
        //console.log(resa);
        res.write(resa);
        res.end();
        return;
      });
    }

    //Alle anderen Files
    else {
      var fileEnding = url.split(".")[url.split(".").length -1];
      var ctype = ""; //path = ".";
      switch (fileEnding) {
        case 'js':
          ctype = "text/javascript";
          break;
        case 'css':
          ctype = "text/css";
          break;
        case 'jpg':
          //path = "./models";
          ctype = "image/jpg";
          break;
        default:
          ctype = "text/html";
      }
      try {
        //console.log("request " + opt.host + " in " + __dirname);
        if (fs.existsSync("." + opt.host)) {
          if (opt.host.indexOf(".") === -1) {
            throw new Error("Client trying to access a folder, would crash");
          }
          //Check if requested file is on whitelist
          var first = opt.host.split("/")[1];
          console.log(first);
          var isOnWhitelist = false;
          for (n in fileWhitelist) {
            if (first === fileWhitelist[n]) {
              isOnWhitelist = true;
            }
          }

          if (isOnWhitelist) {
            //console.log("File found");
            var resfile = fs.readFile("." + opt.host, function(errorf, resfile) {
              if (errorf) {
                console.log(errorf);
                //throw errorf;
              }
              //console.log(ctype + " tried");
              res.writeHeader(200, {"Content-Type": ctype});
              res.write(resfile);
              res.end();
            });
          } else {
            throw new Error("Client requested file is not on whitelist");
          }
        } else {
          console.log("File not found");
          res.writeHeader(404);
          res.end();
        }
      } catch (e) {
        res.writeHeader(401);
        res.end();
        console.error(e);
      }
    }


  }).listen(port)
});

function getAnnoPath(path) {
  var pathTXT = "";
  var ar = path.split("/");
  ar[ar.length-1] = "_" + ar[ar.length-1].substr(0, ar[ar.length-1].length-4);
  for (n in ar) {
    pathTXT = pathTXT + (ar[n] + "/");
  }
  pathTXT = pathTXT + "annotations.txt";
  return pathTXT;
}