implemented deleting from server. multiple uploads by uploader handled and displayed on DOM

app.js

@@ -1,9 +1,11 @@
 const express = require("express")
-var busboy = require("connect-busboy"); //middleware for form/file upload
+const busboy = require("connect-busboy");
-var path = require("path");     //used for file path
+const path = require("path");
-var fs = require("fs-extra");       //File System - for file manipulation
+const fs = require("fs-extra");
+const bodyParser = require('body-parser');
+
 const app = express()
-var redis = require("redis"),
+const redis = require("redis"),
     client = redis.createClient();
 
 client.on("error", function(err) {
@@ -11,12 +13,9 @@ client.on("error", function(err) {
 })
 
 app.use(busboy());
+app.use(bodyParser.json());
 app.use(express.static(path.join(__dirname, "public")));
 
-app.get("/", function (req, res) {
-  res.send("Hello World!")
-})
-
 app.get("/download/:id", function(req, res) {
   res.sendFile(path.join(__dirname + "/public/download.html"));
 });
@@ -25,7 +24,7 @@ app.get("/assets/download/:id", function(req, res) {
   
   let id = req.params.id;
   client.hget(id, "filename", function(err, reply) { // maybe some expiration logic too
-  if (!reply) {
+    if (!reply) {
       res.sendStatus(404);
     } else {
       res.setHeader("Content-Disposition", "attachment; filename=" + reply);
@@ -42,8 +41,26 @@ app.get("/assets/download/:id", function(req, res) {
   
 });
 
-app.route("/upload/:id")
+app.post("/delete/:id", function(req, res) {
-    .post(function (req, res, next) {
+  let id = req.params.id;
+  let delete_token = req.body.delete_token;
+  
+  if (!delete_token){ 
+    res.sendStatus(404);
+  }
+
+  client.hget(id, "delete", function(err, reply) {
+    if (!reply) {
+      res.sendStatus(404);
+    } else {
+      client.del(id);
+      fs.unlinkSync(__dirname + "/static/" + id);
+      res.sendStatus(200);
+    }
+  })
+});
+
+app.post("/upload/:id", function (req, res, next) {
 
         var fstream;
         req.pipe(req.busboy);
@@ -55,17 +72,26 @@ app.route("/upload/:id")
             file.pipe(fstream);
             fstream.on("close", function () {  
                 let id = req.params.id;
-                client.hset(id, "filename", filename, redis.print);
+                let uuid = Math.floor(Math.random() * 10000000).toString()
-                client.hset(id, "expiration", 0, redis.print);
+                         + Math.floor(Math.random() * 10000000).toString()
+                         + Math.floor(Math.random() * 10000000).toString();
+
+                client.hset(id, "filename", filename);
+                client.hset(id, "expiration", 0);
+                client.hset(id, "delete", uuid);
+
+                // delete the file off the server in 24 hours
+                setTimeout(function() {
+                  fs.unlinkSync(__dirname + "/static/" + id);
+                }, 86400000);
+
                 client.expire(id, 86400000);
                 console.log("Upload Finished of " + filename);      
-                res.send(id);
+                res.send(uuid);
             });
         });
     });
 
-
-
 app.listen(3000, function () {
   console.log("Portal app listening on port 3000!")
 })

package.json

@@ -9,6 +9,7 @@
   "author": "",
   "license": "ISC",
   "dependencies": {
+    "body-parser": "^1.17.2",
     "connect-busboy": "0.0.2",
     "express": "^4.15.3",
     "fs-extra": "^3.0.1",

public/download.js

@@ -50,7 +50,7 @@ function download() {
                 a.click();
             })
             .catch(function(err){
-                alert("This link is either invalid or has expired.");
+                alert("This link is either invalid or has expired, or the uploader has deleted the file.");
                 console.error(err);
             });
         })
@@ -60,7 +60,7 @@ function download() {
       };
       fileReader.readAsArrayBuffer(blob);
     } else {
-      alert("Unable to download excel.")
+      alert("This link is either invalid or has expired, or the uploader has deleted the file.")
     }
   };
   xhr.send();

public/index.html

@@ -13,5 +13,8 @@
 
   <p id="downloadProgress"></p>
   
+  <ul id="uploaded_files">
+  </ul>
+
 </body>
 </html> 

public/upload.js

@@ -31,12 +31,40 @@ function onChange(event) {
           var xhr = new XMLHttpRequest();
           var hex = ivToStr(random_iv);
           xhr.open("post", "/upload/" + hex, true);
-          xhr.addEventListener("progress", updateProgress);
+
-          xhr.upload.addEventListener("progress", updateProgress);
+          var li = document.createElement("li");
+          var name = document.createElement("p");
+          name.innerHTML = file.name;
+          li.appendChild(name);
+          
+          var link = document.createElement("a");
+          li.appendChild(link);
+
+          var progress = document.createElement("p");
+          li.appendChild(progress);
+          document.getElementById("uploaded_files").appendChild(li);
+
+
+          xhr.upload.addEventListener("progress", returnBindedLI(progress, name, link, li));
 
           xhr.onreadystatechange = function() { 
             if (xhr.readyState == XMLHttpRequest.DONE) {
               window.crypto.subtle.exportKey("jwk", key).then(function(keydata) {
+                var curr_name = localStorage.getItem(file.name);
+                
+                localStorage.setItem(hex, xhr.responseText);
+
+                link.innerHTML = "http://localhost:3000/download/" + hex + "/#" + keydata.k;
+                link.setAttribute("href", "http://localhost:3000/download/" + hex + "/#" + keydata.k);
+
+                // if (curr_name) {
+                //   localStorage.setItem(file.name, curr_name + "," + hex);
+                // } else {
+                //   localStorage.setItem(file.name, hex)
+                // }
+                
+                
+
                 console.log("Share this link with a friend: http://localhost:3000/download/" + hex + "/#" + keydata.k);
                 alert("Share this link with a friend: http://localhost:3000/download/" + hex + "/#" + keydata.k);
               })
@@ -80,9 +108,42 @@ function strToIv(str) {
   return iv;
 }
 
-function updateProgress(e) {
+function returnBindedLI(a_element, name, link, li) {
-  if (e.lengthComputable) { 
+  return function updateProgress(e) {
-    var percentComplete = Math.floor((e.loaded / e.total) * 100);
+            if (e.lengthComputable) { 
-    document.getElementById("downloadProgress").innerHTML = "Progress: " + percentComplete + "%";
+              var percentComplete = Math.floor((e.loaded / e.total) * 100);
-  } 
+              a_element.innerHTML = "Progress: " + percentComplete + "%";
+
+              if (percentComplete === 100) {
+                var btn = document.createElement("button");
+                btn.innerHTML = "Delete from server";
+                btn.addEventListener("click", function() {
+                  var segments = link.innerHTML.split("/");
+                  var key = segments[segments.length - 2];
+
+                  var xhr = new XMLHttpRequest();
+                  xhr.open("post", "/delete/" + key, true);
+                  xhr.setRequestHeader("Content-Type", "application/json");
+                  if (!localStorage.getItem(key)) return;
+
+                  xhr.send(JSON.stringify({delete_token: localStorage.getItem(key)}));
+
+                  xhr.onreadystatechange = function() {
+                    if (xhr.readyState === XMLHttpRequest.DONE) {
+                      document.getElementById("uploaded_files").removeChild(li);
+                    }
+
+                    if (xhr.status === 200) {
+                      console.log("The file was successfully deleted.");
+                    } else {
+                      console.log("The file has expired, or has already been deleted.");
+                    }
+                  }
+                  
+                });
+                li.appendChild(btn);
+              }
+            } 
+          }
 }
+