set styles for uploading files

Change-Id: I7d3f934ea4f31769d72d1f21c733ab0c16b325f6
diff --git a/client/src/utils/files.ts b/client/src/utils/files.ts
new file mode 100644
index 0000000..49c3171
--- /dev/null
+++ b/client/src/utils/files.ts
@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2022 Savoir-faire Linux Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation; either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public
+ * License along with this program.  If not, see
+ * <https://www.gnu.org/licenses/>.
+ */
+
+export class FileHandler {
+  private static lastId = 0;
+
+  private static getNewId() {
+    return ++this.lastId;
+  }
+
+  readonly id: number;
+  readonly file: File;
+  readonly url: string;
+
+  constructor(file: File) {
+    this.id = FileHandler.getNewId();
+    this.file = file;
+    this.url = URL.createObjectURL(file);
+  }
+}