Truncate file used by the sw-file-digester.js after processing

public/scripts/network.js

@@ -1813,6 +1813,13 @@ class FileDigester {
             });
         }
 
+        function deleteFile() {
+            fileWorker.postMessage({
+                type: "delete-file",
+                name: _this._name
+            })
+        }
+
         function onPart(part) {
             // remove old chunk from buffer
             _this._buffer[i] = null;
@@ -1831,16 +1838,23 @@ class FileDigester {
 
         function onFile(file) {
             _this._buffer = [];
-            fileWorker.terminate();
             _this._fileCompleteCallback(file);
+            deleteFile();
+        }
+
+        function onFileDeleted() {
+            // File Digestion complete -> Tidy up
+            fileWorker.terminate();
         }
 
         function onError(error) {
-            // an error occurred. Use memory method instead.
+            // an error occurred.
             Logger.error(error);
             Logger.warn('Failed to process file via service-worker. Do not use Firefox private mode to prevent this.')
-            fileWorker.terminate();
+
+            // Use memory method instead and tidy up.
             _this.processFileViaMemory();
+            fileWorker.terminate();
         }
 
         sendPart(this._buffer[i], offset);
@@ -1853,6 +1867,9 @@ class FileDigester {
                 case "file":
                     onFile(e.data.file);
                     break;
+                case "file-deleted":
+                    onFileDeleted();
+                    break;
                 case "error":
                     onError(e.data.error);
                     break;

public/scripts/sw-file-digester.js

@@ -7,6 +7,9 @@ self.addEventListener('message', async e => {
             case "get-file":
                 await this.onGetFile(e.data.name);
                 break;
+            case "delete-file":
+                await this.onDeleteFile(e.data.name);
+                break;
         }
     }
     catch (e) {
@@ -32,7 +35,9 @@ async function onPart(fileName, buffer, offset) {
     // Write the message to the end of the file.
     let encodedMessage = new DataView(buffer);
     accessHandle.write(encodedMessage, { at: offset });
-    accessHandle.close();
+
+    // Always close FileSystemSyncAccessHandle if done.
+    accessHandle.close();    accessHandle.close();
 
     self.postMessage({type: "part", part: encodedMessage});
     encodedMessage = null;
@@ -43,6 +48,19 @@ async function onGetFile(fileName) {
     let file = await fileHandle.getFile();
 
     self.postMessage({type: "file", file: file});
-    file = null;
-    // Todo: delete file from storage
+}
+
+async function onDeleteFile(fileName) {
+    const accessHandle = await getAccessHandle(fileName);
+
+    // Truncate the file to 0 bytes
+    accessHandle.truncate(0);
+
+    // Persist changes to disk.
+    accessHandle.flush();
+
+    // Always close FileSystemSyncAccessHandle if done.
+    accessHandle.close();
+
+    self.postMessage({type: "file-deleted"});
 }