How to Implementing Auth Guard with
Component less Route in Angular 5?
Let’s start how to Generate Guard, I am using Angular CLI command for generating Auth Guard on Angular 5 applications.
In this article, we take a look with
few of the different types of guards and how to implement them for specific use-
1. Maybe
the user must authenticate and then login in the app.
2. If
user has logged in but is not authorized to navigate to the target component.
3. We
might ask the user if its OK to discard pending changes rather than save them.
There are four different types of Guards -
1. CanActivate
– It use to checks to see if a user can visit a route.
2. CanActivateChild
- It use to checks to see if a user can visit a routes child.
3. CanDeactivate
- It use to checks to see if a user can exit a route.
4. Resolve
- It use to perform route data retrieval before route activation.
5. CanLoad
- It use to checks to see if a user can
route to a module that lazy loaded
Let’s start how to Generate Guard, I am using Angular CLI command for generating Auth Guard on Angular 5 applications.
The Auth Guard implementation is quite simple and
Auth Guard CLI command is –
ng generate guard auth
Why Use Auth Guard in Angular 5?
The Auth Guard
is used to redirect the user to the page they landed on before being forced to
login.
Now, go to your project directory and execute the
guard command i.e.
D:\Angular\AngularMaterial>ng generate guard auth
create src/app/auth.guard.spec.ts (346 bytes)
create src/app/auth.guard.ts (401 bytes)
auth.guard.ts
–
import { Injectable } from '@angular/core';
import { CanActivate, ActivatedRouteSnapshot, RouterStateSnapshot } from '@angular/router';
import { Observable } from 'rxjs/Observable';
@Injectable()
export class AuthGuard implements CanActivate {
canActivate(
next: ActivatedRouteSnapshot,
state: RouterStateSnapshot): Observable<boolean> | Promise<boolean> | boolean {
return true;
}
}
And
auth.guard.spec.ts
–
import { TestBed, async, inject } from '@angular/core/testing';
import { AuthGuard } from './auth.guard';
describe('AuthGuard', () => {
beforeEach(() => {
TestBed.configureTestingModule({
providers: [AuthGuard]
});
});
it('should ...', inject([AuthGuard], (guard: AuthGuard) => {
expect(guard).toBeTruthy();
}));
});
Now, we generate the login component for using
angular gourd –
D:\Angular\AngularMaterial>ng g component login
create src/app/login/login.component.html (24 bytes)
create src/app/login/login.component.spec.ts (621 bytes)
create src/app/login/login.component.ts (265 bytes)
create src/app/login/login.component.css (0 bytes)
update src/app/app.module.ts (394 bytes)
And the app.module.ts looks like –
import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import {FormsModule, FormGroup} from '@angular/forms';
import {RouterModule} from '@angular/router';
//MY COMPONENTS
import { AppComponent } from './app.component';
import { LoginComponent } from './login/login.component';
import { RegisterComponent } from './register/register.component';
@NgModule({
declarations: [
AppComponent,
LoginComponent,
RegisterComponent
],
imports: [
BrowserModule,
FormsModule,
RouterModule.forRoot([
{ path: '', component: AppComponent, pathMatch: 'full' },
{ path: 'register', component: RegisterComponent },
{ path: 'login', component: LoginComponent}])
],
providers: [],
bootstrap: [AppComponent]
})
export class AppModule { }
Now, Create Auth Service-
D:\Angular\AngularMaterial>ng
g service
AuthService
create src/app/auth-service.service.spec.ts
(405 bytes)
create src/app/auth-service.service.ts
(117 bytes)
Auth Service looks like- auth-service.service.ts
import
{ Injectable } from
'@angular/core';
import
{ Router } from
'@angular/router';
@Injectable()
export
class AuthServiceService
{
constructor(private
router: Router)
{ }
//Set User Secure Token
setSecureToken(secure_token:
string) {
localStorage.setItem("LoggedIn",
secure_token)
}
//Set User Secure Token
getSecureToken() {
return localStorage.getItem("LoggedIn")
}
//Check User is LoggedIn or not!
isLoggednIn() {
return this.getSecureToken()
!== null;
}
//Logout method
logout() {
localStorage.removeItem("LoggedIn");
this.router.navigate(["login"]);
}
}
Now, calling the login service methods to
validate user on login components and it looks like – login.component.ts
import
{ Component, OnInit
} from '@angular/core';
import
{ FormBuilder, Validators
} from '@angular/forms';
import
{ Router } from
'@angular/router';
import
{ AuthServiceService
} from '../auth-service.service';
@Component({
selector: 'app-login',
templateUrl: './login.component.html',
styleUrls: ['./login.component.css']
})
export
class LoginComponent
implements OnInit
{
//variable initialization
form;
//constructor initialization
constructor(private
fbuilder: FormBuilder,
private route:
Router,
private authService:
AuthServiceService)
{
this.form
= fbuilder.group({
email:
['', [Validators.required,
Validators.email]],
password:
['', Validators.required,
Validators.minLength]
});
}
//ngOnInit method
ngOnInit() {
}
//This method use for Login
login() {
if (this.form.valid)
{
this.authService.setSecureToken(this.form.value.email)
this.route.navigate(["dashboard"]);
}
}
}
Now, coming to your Auth Gourd and use your Auth
service to validate the users and returns your status –
import
{ Injectable } from
'@angular/core';
import
{ CanActivate, ActivatedRouteSnapshot,
RouterStateSnapshot
} from '@angular/router';
import
{ Observable } from
'rxjs/Observable';
import
{Router} from
'@angular/router';
import
{ AuthServiceService
} from './auth-service.service';
@Injectable()
export
class AuthGuard
implements CanActivate
{
//constructor initialization
constructor(private
authService: AuthServiceService, private
route: Router){ }
canActivate(
next: ActivatedRouteSnapshot,
state: RouterStateSnapshot):
Observable<boolean>
| Promise<boolean>
| boolean {
if(this.authService.isLoggednIn()){
return
true;
}else{
this.route.navigate(["login"]);
return
false;
}
}
}
You must add your Auth Service and Auth Guard
in you app.module.ts and its looks
like –
import
{ BrowserModule } from
'@angular/platform-browser';
import
{ NgModule } from
'@angular/core';
import
{FormsModule, FormGroup}
from '@angular/forms';
import
{RouterModule} from
'@angular/router';
//MY COMPONENTS
import
{ AppComponent } from
'./app.component';
import
{ LoginComponent } from
'./login/login.component';
import
{ RegisterComponent
} from './register/register.component';
import
{ AuthServiceService
} from './auth-service.service';
import
{ AuthGuard } from
'./auth.guard';
@NgModule({
declarations: [
AppComponent,
LoginComponent,
RegisterComponent
],
imports: [
BrowserModule,
FormsModule,
RouterModule.forRoot([
{ path: '',
component: AppComponent,
pathMatch: 'full',
canActivate: [AuthGuard]
},
{ path: 'register',
component: RegisterComponent
},
{ path: 'login',
component: LoginComponent}])
],
providers: [],
bootstrap: [AppComponent]
})
export
class AppModule
{ }
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