Use environment for settings

src/app/user.service.ts

@@ -10,6 +10,8 @@ import { MatTableDataSource } from '@angular/material';
 
 import { SnackBarService } from './snackbar.service';
 
+import { environment } from '../environments/environment';
+
 interface Group {
   name: string;
 }
@@ -92,11 +94,11 @@ export class UserService {
   }
 
   public setIdPPreference(idpId: number) {
-    this.cookieService.set('idp_id', String(idpId));
+    this.cookieService.set(environment.idpCookieName, String(idpId));
   }
 
   public getIdPPreference(): number {
-    return Number(this.cookieService.get('idp_id'));
+    return Number(this.cookieService.get(environment.idpCookieName));
   }
 
   public updateData(data: any) {

src/environments/environment.ts

@@ -4,5 +4,6 @@
 // The list of which env maps to which file can be found in `.angular-cli.json`.
 
 export const environment = {
-  production: false
+  production: false,
+  idpCookieName: 'idp_id'
 };