Is it possible to implement a redirect in Angular's Resolve Navigation Guard when an error is encountered from a resolved promise?

I have integrated Angularfire into my Angular project and am utilizing the authentication feature. Everything is functioning properly, however, my Resolve Navigation Guard is preventing the activation of the component in case of an error during the resolve process.

Reference:

QUERY:

How can I ensure that my dashboard route does not get activated unless the authentication has been resolved successfully without any errors?

This @Injectable serves as the AuthGuard

import { Injectable } from '@angular/core';
import { Resolve } from '@angular/router';
import { myFirebaseAuthConfig } from "./auth";
import { AngularFire } from "angularfire2";

@Injectable()
export class CanActivateViaAuthGuard implements Resolve<any> {
  constructor(private af: AngularFire) {}

  resolve() {
    return this.af.auth.login(myFirebaseAuthConfig)
      .then(data => {
        console.log(data, 'data');
        return data;
      })
      .catch(err => {
        console.log(err, 'err');
        return err;
      });
  }
}

The Module:

@NgModule({
  imports: [
    routing,
    AngularFireClientModule,
  ],
  providers: [CanActivateViaAuthGuard],
  declarations: [AdminComponent, LoginComponent, SignupComponent],
  exports: [AdminComponent],
})
export class AdminRouteModule {}

The Route

import { Routes, RouterModule } from "@angular/router";
import { AdminComponent } from "./admin.component";
import { ModuleWithProviders } from "@angular/core";
import { LoginComponent } from "../login/login.component";
import { SignupComponent } from "../signup/signup.component";
import { CanActivateViaAuthGuard } from "../firebase/auth.service";

export const routerConfig: Routes = [
  { path: '', redirectTo: 'login', pathMatch: 'full' },
  {
    path: 'dashboard',
    component: AdminComponent,
    resolve: [CanActivateViaAuthGuard],
  },
  {path: 'login', component: LoginComponent},
  {path: 'signup', component: SignupComponent},
];

export const routing: ModuleWithProviders = RouterModule.forChild(routerConfig);

Answer №1

Two distinct interfaces, Guards and Resolvers, serve different purposes:

Guards: Validate a specific condition before allowing navigation to a designated route.

Resolver: Fetch necessary data for a particular component.

If you need to prevent a component from loading under certain conditions, utilize a Guard like this example:

@Injectable()
export class GuardService implements CanActivate, CanActivateChild {

  // Replace MyService with AngularFire in your implementation
  constructor(private myService: MyService,
    private router: Router) {
  }

  canActivate(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): boolean {
    return this.checkAuthentication();
  }

  canActivateChild(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): boolean {
    return this.checkAuthentication();
  }

  private checkAuthentication(): boolean {
    return this.myService.canIGoToThisRoute();
  }
}

The Guard should implement the canActivate interface as shown above. In your RoutingModule, specify the GuardService in the routing configuration:

export const routerConfig: Routes = [
  { path: '', redirectTo: 'login', pathMatch: 'full' },
  {
    path: 'dashboard',
    component: AdminComponent,
    // Change to canActivate; remember to add it to providers
    canActivate: [GuardService], 

  },
  {path: 'login', component: LoginComponent},
  {path: 'signup', component: SignupComponent},
];

export const routing: ModuleWithProviders = RouterModule.forChild(routerConfig);

If resorting to a resolver is still preferred, inject the router and handle redirection on errors.

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