Express/Multer http upload

upload.js

const os = require("os");
const fs = require("fs");
const path = require("path");
const express = require('express');
const multer = require('multer');
const bodyParser = require('body-parser');


// build/normalize paths
const src = path.resolve(os.tmpdir(), "uploads");
const dest = path.resolve(__dirname, "videos");


// create app/upload middleware
const app = express();
const upload = multer({
  dest: src
});


/**
 * List/return current video files
 */
app.get("/", function(req, res){
  fs.readdir(dest, function(err, files){    
    if(err){
      
      console.log("ERROR >>", err);
      res.end("error: " + err);
      
    }else{
      
      // send back to client
      res.json(files);
      
    }    
  }); 
});


/**
 * Upload files to "videos" folder
 */
app.put('/', upload.array('movies'), function (req, res) {


  // req.files is array of `photos` files
  // req.body will contain the text fields, if there were any
  let counter = req.files.length;


  // check if upload complete
  // all shit is done, files moved, etc...
  const done = function done() {
    if (counter === 0) {

      // feedback
      console.log("All files uploaded!");
      res.end("complete");

    }
  };


  if (req.files.length > 0) {
    req.files.forEach(function (file) {

      let target = path.resolve(dest, file.originalname);

      // feedback
      console.log("move %s to %s", file.path, target);

      // move from temp to video destination
      fs.rename(file.path, target, function (err) {
        if (err) {

          // feedback
          console.log("Could not move %s to destination", file.path);
          res.write("Error: " + file.originalname);

        } else {

          // remove from temp location
          fs.unlink(file.path, function (err) {

            // check if upload complete
            // ignore errors, the OS does this for us  
            counter--;
            done();

          });

        }
      });


    });
  }


});


/**
 * Remove files from "videos" folder
 */
app.delete("/", bodyParser.json(), function (req, res) {
  if (req.body) {

    // feedback
    console.log("Delete files", req.body);
    let counter = req.body.length;


    // check if upload complete
    // all shit is done, files moved, etc...
    const done = function done() {
      if (counter === 0) {

        // feedback
        console.log("All files uploaded!");
        res.end("complete");

      }
    };
    

    // remove each file from /videos
    // feedback to clien/server
    req.body.forEach(function (file) {
      fs.unlink(path.resolve(dest, file), function (err) {
        
        if(err && err.code === "ENOENT"){
          counter--;
          return done();                   
        }
        
        if (err) {

          // feedback
          console.log("Error", err);
          res.end(err);

        } else {
          
          // feedback
          res.write(file + "\n");

          // decrement counter
          // check if complete
          counter--;
          done();

        }
        
      });
    });

  }
});


// fire server up
// feedback
app.listen(3020, "0.0.0.0", function(){
  
  let addr = this.address();
  console.log("Server running on http://%s:%s/", addr.address, addr.port);
  
});