migrate firebase auth

src/app/widget-modules/guards/auth.guard.ts

@@ -0,0 +1,22 @@
+import {Injectable} from '@angular/core';
+import {CanActivate, Router, UrlTree} from '@angular/router';
+import {Auth, authState} from '@angular/fire/auth';
+import {Observable} from 'rxjs';
+import {map, take} from 'rxjs/operators';
+
+@Injectable({
+  providedIn: 'root',
+})
+export class AuthGuard implements CanActivate {
+  public constructor(
+    private auth: Auth,
+    private router: Router
+  ) {}
+
+  public canActivate(): Observable<boolean | UrlTree> {
+    return authState(this.auth).pipe(
+      take(1),
+      map(user => (user ? true : this.router.createUrlTree(['user', 'login'])))
+    );
+  }
+}