formatted code and deleted extra code from download.js

frontend/src/download.js

@@ -1,7 +1,6 @@
 const FileReceiver = require('./fileReceiver');
 
 let download = () => {
-
   const fileReceiver = new FileReceiver();
 
   let li = document.createElement('li');
@@ -40,147 +39,7 @@ let download = () => {
     a.download = fname;
     document.body.appendChild(a);
     a.click();
-  })
+  });
-}
+};
-// const FileReceiver = require('./fileReceiver');
-
-// let download = () => {
-//   let xhr = new XMLHttpRequest();
-//   xhr.open('get', '/assets' + location.pathname.slice(0, -1), true);
-//   xhr.responseType = 'blob';
-
-//   let listelem = setupUI();
-//   xhr.addEventListener('progress', updateProgress.bind(null, listelem));
-
-//   xhr.onload = function(e) {
-//     // maybe send a separate request before this one to get the filename?
-
-//     // maybe render the html itself with the filename, since it's generated server side
-//     // after a get request with the unique id
-//     listelem.emit(
-//       'name',
-//       xhr.getResponseHeader('Content-Disposition').match(/filename="(.+)"/)[1]
-//     );
-
-//     if (this.status == 200) {
-//       let self = this;
-//       let blob = new Blob([this.response]);
-//       let arrayBuffer;
-//       let fileReader = new FileReader();
-//       fileReader.onload = function() {
-//         arrayBuffer = this.result;
-//         let array = new Uint8Array(arrayBuffer);
-//         salt = strToIv(location.pathname.slice(10, -1));
-
-//         window.crypto.subtle
-//           .importKey(
-//             'jwk',
-//             {
-//               kty: 'oct',
-//               k: location.hash.slice(1),
-//               alg: 'A128CBC',
-//               ext: true
-//             },
-//             {
-//               name: 'AES-CBC'
-//             },
-//             true,
-//             ['encrypt', 'decrypt']
-//           )
-//           .then(key => {
-//             return window.crypto.subtle.decrypt(
-//               {
-//                 name: 'AES-CBC',
-//                 iv: salt
-//               },
-//               key,
-//               array
-//             );
-//           })
-//           .then(decrypted => {
-//             let dataView = new DataView(decrypted);
-//             let blob = new Blob([dataView]);
-//             let downloadUrl = URL.createObjectURL(blob);
-//             let a = document.createElement('a');
-//             a.href = downloadUrl;
-//             a.download = xhr
-//               .getResponseHeader('Content-Disposition')
-//               .match(/filename="(.+)"/)[1];
-//             document.body.appendChild(a);
-//             a.click();
-//           })
-//           .catch(err => {
-//             alert(
-//               'This link is either invalid or has expired, or the uploader has deleted the file.'
-//             );
-//             console.error(err);
-//           });
-//       };
-
-//       fileReader.readAsArrayBuffer(blob);
-//     } else {
-//       alert(
-//         'This link is either invalid or has expired, or the uploader has deleted the file.'
-//       );
-//     }
-//   };
-//   xhr.send();
-// };
 
 window.download = download;
-
-// let setupUI = () => {
-//   let li = document.createElement('li');
-//   let name = document.createElement('p');
-//   li.appendChild(name);
-
-//   let progress = document.createElement('p');
-//   li.appendChild(progress);
-
-//   document.getElementById('downloaded_files').appendChild(li);
-
-//   return new UIWrapper(li, name, null, progress);
-// };
-
-// let ivToStr = iv => {
-//   let hexStr = '';
-//   for (let i in iv) {
-//     if (iv[i] < 16) {
-//       hexStr += '0' + iv[i].toString(16);
-//     } else {
-//       hexStr += iv[i].toString(16);
-//     }
-//   }
-//   window.hexStr = hexStr;
-//   return hexStr;
-// };
-
-// let strToIv = str => {
-//   let iv = new Uint8Array(16);
-//   for (let i = 0; i < str.length; i += 2) {
-//     iv[i / 2] = parseInt(str.charAt(i) + str.charAt(i + 1), 16);
-//   }
-
-//   return iv;
-// };
-
-// let updateProgress = (UIelem, e) => {
-//   if (e.lengthComputable) {
-//     let percentComplete = Math.floor(e.loaded / e.total * 100);
-//     UIelem.emit('progress', 'Progress: ' + percentComplete + '%');
-
-//     if (percentComplete === 100) {
-//       let finished = document.createElement('p');
-//       finished.innerText = 'Your download has finished.';
-//       UIelem.li.appendChild(finished);
-
-//       let close = document.createElement('button');
-//       close.innerText = 'Ok';
-//       close.addEventListener('click', () => {
-//         document.getElementById('downloaded_files').removeChild(UIelem.li);
-//       });
-
-//       UIelem.li.appendChild(close);
-//     }
-//   }
-// };

frontend/src/fileReceiver.js

@@ -7,7 +7,6 @@ class FileReceiver extends EventEmitter {
     this.salt = strToIv(location.pathname.slice(10, -1));
   }
 
-
   download() {
     return Promise.all([
       new Promise((resolve, reject) => {
@@ -26,49 +25,49 @@ class FileReceiver extends EventEmitter {
           fileReader.onload = function() {
             resolve({
               data: this.result,
-              fname: xhr.getResponseHeader('Content-Disposition').match(/filename="(.+)"/)[1]
+              fname: xhr
+                .getResponseHeader('Content-Disposition')
+                .match(/filename="(.+)"/)[1]
             });
-          }
+          };
 
           fileReader.readAsArrayBuffer(blob);
-        }
+        };
 
         xhr.open('get', '/assets' + location.pathname.slice(0, -1), true);
         xhr.responseType = 'blob';
         xhr.send();
       }),
-      window.crypto.subtle
+      window.crypto.subtle.importKey(
-        .importKey(
+        'jwk',
-          'jwk',
+        {
+          kty: 'oct',
+          k: location.hash.slice(1),
+          alg: 'A128CBC',
+          ext: true
+        },
+        {
+          name: 'AES-CBC'
+        },
+        true,
+        ['encrypt', 'decrypt']
+      )
+    ]).then(([fdata, key]) => {
+      let salt = this.salt;
+      return Promise.all([
+        window.crypto.subtle.decrypt(
           {
-            kty: 'oct',
-            k: location.hash.slice(1),
-            alg: 'A128CBC',
-            ext: true
-          },
-          {
-            name: 'AES-CBC'
-          },
-          true,
-          ['encrypt', 'decrypt']
-        )
-    ])
-      .then(([fdata, key]) => {
-        let salt = this.salt;
-        return Promise.all([
-          window.crypto.subtle.decrypt(
-            {
             name: 'AES-CBC',
             iv: salt
-            },
+          },
-            key,
+          key,
-            fdata.data
+          fdata.data
-          ),
+        ),
-          new Promise((resolve, reject) => {
+        new Promise((resolve, reject) => {
-            resolve(fdata.fname);
+          resolve(fdata.fname);
-          })
+        })
-        ]);
+      ]);
-      })
+    });
   }
 }
 

frontend/src/upload.js

@@ -21,7 +21,8 @@ let onChange = event => {
     progress.innerText = `Progress: ${percentComplete}%`;
   });
   fileSender.upload().then(info => {
-    const url = `${window.location.origin}/download/${info.fileId}/#${info.secretKey}`;
+    const url = `${window.location
+      .origin}/download/${info.fileId}/#${info.secretKey}`;
     localStorage.setItem(info.fileId, info.deleteToken);
     link.innerText = url;
     link.setAttribute('href', url);