[DURACOM-312] set the X-On-Behalf-Of header with impersonatingID in FileUploader.

(cherry picked from commit 727bcdc2cb23ae7fcff1d9ddfa794f872f1d1b8c)

Author: AdamF42

src/app/shared/upload/uploader/uploader.component.ts

@@ -47,6 +47,11 @@ import { UploaderProperties } from './uploader-properties.model';
 })
 export class UploaderComponent implements OnInit, AfterViewInit {
 
+  /**
+   * Header key to impersonate a user
+   */
+  private readonly ON_BEHALF_HEADER = 'X-On-Behalf-Of';
+
   /**
    * The message to show when drag files on the drop zone
    */
@@ -162,7 +167,13 @@ export class UploaderComponent implements OnInit, AfterViewInit {
         item.url = this.uploader.options.url;
       }
       // Ensure the current XSRF token is included in every upload request (token may change between items uploaded)
-      this.uploader.options.headers = [{ name: XSRF_REQUEST_HEADER, value: this.tokenExtractor.getToken() }];
+      // Ensure the behalf header is set if impersonating
+      this.uploader.options.headers = [
+        { name: XSRF_REQUEST_HEADER, value: this.tokenExtractor.getToken() },
+        ...(hasValue(this.uploadFilesOptions.impersonatingID)
+          ? [{ name: this.ON_BEHALF_HEADER, value: this.uploadFilesOptions.impersonatingID }]
+          : [])
+      ];
       this.onBeforeUpload();
       this.isOverDocumentDropZone = observableOf(false);
     };