added loading, hashing, and encrypting events for uploader; decrypting and hashing events for the downloader

frontend/src/download.js

@@ -34,6 +34,24 @@ $(document).ready(function() {
       }
     });
 
+    fileReceiver.on('decrypting', isStillDecrypting => {
+      // The file is being decrypted
+      if (isStillDecrypting) {
+        console.log('Decrypting')
+      } else {
+        console.log('Done decrypting')
+      }
+    })
+
+    fileReceiver.on('hashing', isStillHashing => {
+      // The file is being hashed to make sure a malicious user hasn't tampered with it
+      if (isStillHashing) {
+        console.log('Checking file integrity')
+      } else {
+        console.log('Integrity check done')
+      }
+    })
+
     fileReceiver
       .download()
       .catch(() => {

frontend/src/fileReceiver.js

@@ -62,6 +62,7 @@ class FileReceiver extends EventEmitter {
         ['encrypt', 'decrypt']
       )
     ]).then(([fdata, key]) => {
+      this.emit('decrypting', true);
       return Promise.all([
         window.crypto.subtle.decrypt(
           {
@@ -71,7 +72,12 @@ class FileReceiver extends EventEmitter {
           },
           key,
           fdata.data
-        ),
+        ).then(decrypted => {
+          this.emit('decrypting', false);
+          return new Promise((resolve, reject) => {
+            resolve(decrypted);
+          })
+        }),
         new Promise((resolve, reject) => {
           resolve(fdata.filename);
         }),
@@ -80,7 +86,9 @@ class FileReceiver extends EventEmitter {
         })
       ]);
     }).then(([decrypted, fname, proposedHash]) => {
+      this.emit('hashing', true);
       return window.crypto.subtle.digest('SHA-256', decrypted).then(calculatedHash => {
+        this.emit('hashing', false);
         const integrity = new Uint8Array(calculatedHash).toString() === proposedHash.toString();
         if (!integrity) {
           return new Promise((resolve, reject) => {

frontend/src/fileSender.js

@@ -36,6 +36,8 @@ class FileSender extends EventEmitter {
   }
 
   upload() {
+    const self = this;
+    self.emit('loading', true);
     return Promise.all([
       window.crypto.subtle
         .generateKey(
@@ -53,8 +55,12 @@ class FileSender extends EventEmitter {
         const reader = new FileReader();
         reader.readAsArrayBuffer(this.file);
         reader.onload = function(event) {
+          self.emit('loading', false);
+          self.emit('hashing', true);
           const plaintext = new Uint8Array(this.result);
           window.crypto.subtle.digest('SHA-256', plaintext).then(hash => {
+            self.emit('hashing', false);
+            self.emit('encrypting', true);
             resolve({plaintext: plaintext, hash: new Uint8Array(hash)});
           })
         };
@@ -75,7 +81,12 @@ class FileSender extends EventEmitter {
               },
               secretKey,
               file.plaintext
-            ),
+            ).then(encrypted => {
+              self.emit('encrypting', false);
+              return new Promise((resolve, reject) => {
+                resolve(encrypted);
+              })
+            }),
           window.crypto.subtle.exportKey('jwk', secretKey),
           new Promise((resolve, reject) => { resolve(file.hash) })
         ]);
@@ -94,7 +105,7 @@ class FileSender extends EventEmitter {
           xhr.upload.addEventListener('progress', e => {
             if (e.lengthComputable) {
               const percentComplete = Math.floor(e.loaded / e.total * 100);
-              this.emit('progress', percentComplete);
+              self.emit('progress', percentComplete);
             }
           });
 

frontend/src/upload.js

@@ -84,6 +84,34 @@ $(document).ready(function() {
         .style.setProperty('--progress', percentComplete + '%');
       $('#progress-text').html(`${percentComplete}%`);
     });
+
+    fileSender.on('loading', isStillLoading => {
+      // The file is loading into Firefox at this stage
+      if (isStillLoading) {
+        console.log('Processing')
+      } else {
+        console.log('Finished processing')
+      }
+    })
+
+    fileSender.on('hashing', isStillHashing => {
+      // The file is being hashed
+      if (isStillHashing) {
+        console.log('Hashing');
+      } else {
+        console.log('Finished hashing')
+      }
+    })
+
+    fileSender.on('encrypting', isStillEncrypting => {
+      // The file is being encrypted
+      if (isStillEncrypting) {
+        console.log('Encrypting');
+      } else {
+        console.log('Finished encrypting')
+      }
+    })
+
     fileSender
       .upload()
       .then(info => {
@@ -111,6 +139,7 @@ $(document).ready(function() {
       })
       .catch(err => {
         Raven.captureException(err);
+        console.log(err);
         $('#page-one').hide();
         $('#upload-error').show();
       });