Implement file deletion

fileupload.go

@@ -79,7 +79,7 @@ func (t fileUploadState) String() string {
 
 func OpenFileStore(path string) error {
 	if path == "" {
-		return errors.New("file store path not set")
+		return errors.New("file-store not set")
 	}
 
 	// Try to create the file store directory if it does not yet exist
@@ -158,11 +158,23 @@ func (fu *fileUpload) save(tx *bolt.Tx) error {
 }
 
 func (fu *fileUpload) delete(tx *bolt.Tx) error {
-	// Replace the old paste with a new empty paste
-	return (&fileUpload{
+	// Remove the file in the backend
+	filePath := fileStorePath(fu.ID, fu.FileName)
+	if err := os.Remove(filePath); err != nil {
+		return err
+	}
+
+	// Update the file in the server
+	if err := (&fileUpload{
 		ID:    fu.ID,
 		State: fileUploadStateDeleted,
-	}).save(tx)
+	}).save(tx); err != nil {
+		return err
+	}
+
+	// Cleanup the parent directory
+	wrap := "deletion succeeded, but removing the file directory has failed"
+	return errors.Wrap(os.Remove(path.Dir(filePath)), wrap)
 }
 
 func (fu *fileUpload) url() *url.URL {