96252: Extract upload-specific code from SharedModule

src/app/core/drag.service.ts

@@ -0,0 +1,28 @@
+/**
+ * The contents of this file are subject to the license and copyright
+ * detailed in the LICENSE and NOTICE files at the root of the source
+ * tree and available online at
+ *
+ * http://www.dspace.org/license/
+ */
+
+import { Injectable } from '@angular/core';
+
+@Injectable({
+  providedIn: 'root'
+})
+export class DragService {
+  private _overrideDragOverPage = false;
+
+  public overrideDragOverPage() {
+    this._overrideDragOverPage = true;
+  }
+
+  public allowDragOverPage() {
+    this._overrideDragOverPage = false;
+  }
+
+  public isAllowedDragOverPage(): boolean {
+    return !this._overrideDragOverPage;
+  }
+}