Use a cookie to set idp preference

src/app/login/login.component.ts

@@ -19,10 +19,14 @@ export class LoginComponent {
     public dialog: DialogService,
     public http: HttpClient,
   ) {
+    this.selectedIdP = this.userService.getIdPPreference();
+
     this.userService.getAuthInfo().subscribe(
       data => {
         this.idps = data['idps'];
-        this.selectedIdP = data['default'];
+        if (!this.selectedIdP) {
+          this.selectedIdP = data['default'];
+        }
       }
     );
   }

src/app/user.service.ts

@@ -91,19 +91,12 @@ export class UserService {
     );
   }
 
-  public backendOperational(): Observable<boolean> {
-    return this.http.get('/backend/api/operational').map(
-      (data) => {
-        return data['operational'];
-      },
-      (err) => {
-        return false;
-      }
-    );
+  public setIdPPreference(idpId: number) {
+    this.cookieService.set('idp_id', String(idpId));
   }
 
-  public login(idpId: number) {
-    window.location.href = 'https://hdf-portal.data.kit.edu/backend/auth/v1/request/?idp=' + idpId;
+  public getIdPPreference(): number {
+    return Number(this.cookieService.get('idp_id'));
   }
 
   public updateData(data: any) {
@@ -169,6 +162,11 @@ export class UserService {
     this.updateState();
   }
 
+  public login(idpId: number) {
+    this.setIdPPreference(idpId);
+    window.location.href = 'https://hdf-portal.data.kit.edu/backend/auth/v1/request';
+  }
+
   public logout() {
     this.http.post('/backend/auth/v1/logout/', {}).subscribe(
       data => {