Fix: get highest ASN regardless of user (#4326)

src-ui/src/app/services/rest/document.service.spec.ts

@@ -229,6 +229,14 @@ describe(`DocumentService`, () => {
       `${environment.apiBaseUrl}${endpoint}/${documents[0].id}/preview/#search="${searchQuery}"`
     )
   })
+
+  it('should support get next asn', () => {
+    subscription = service.getNextAsn().subscribe((asn) => asn)
+    const req = httpTestingController.expectOne(
+      `${environment.apiBaseUrl}${endpoint}/next_asn/`
+    )
+    expect(req.request.method).toEqual('GET')
+  })
 })
 
 beforeEach(() => {

src-ui/src/app/services/rest/document.service.ts

@@ -143,6 +143,10 @@ export class DocumentService extends AbstractPaperlessService<PaperlessDocument>
     return url
   }
 
+  getNextAsn(): Observable<number> {
+    return this.http.get<number>(this.getResourceUrl(null, 'next_asn'))
+  }
+
   update(o: PaperlessDocument): Observable<PaperlessDocument> {
     // we want to only set created_date
     o.created = undefined