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Angular: Login

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Angular: Login

This tutorial demonstrates how to add user login to an Angular (versions 2 and above) application using Auth0. We recommend you to Log in to follow this quickstart with examples configured for your account.

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System requirements: Angular 7+

New to Auth? Learn How Auth0 works, how it integrates with Single-Page Applications and which protocol it uses.

Configure Auth0

Get Your Application Keys

When you signed up for Auth0, a new application was created for you, or you could have created a new one.

You will need some details about that application to communicate with Auth0. You can get these details from the Application Settings section in the Auth0 dashboard.

You need the following information:

  • Domain
  • Client ID

If you download the sample from the top of this page these details are filled out for you.

If you have more than one application in your account, the sample comes with the values for your Default App.

App Dashboard

Configure Callback URLs

A callback URL is a URL in your application where Auth0 redirects the user after they have authenticated.

The callback URL for your app must be whitelisted in the Allowed Callback URLs field in your Application Settings. If this field is not set, users will be unable to log in to the application and will get an error.

If you are following along with the sample project you downloaded from the top of this page, you should set the Allowed Callback URL to http://localhost:3000/callback.

Configure Logout URLs

A logout URL is a URL in your application that Auth0 can return to after the user has been logged out of the authorization server. This is specified in the returnTo query parameter.

The logout URL for your app must be whitelisted in the Allowed Logout URLs field in your Application Settings. If this field is not set, users will be unable to log out from the application and will get an error.

If you are following along with the sample project you downloaded from the top of this page, the logout URL you need to whitelist in the Allowed Logout URLs field is http://localhost:3000.

Configure Allowed Web Origins

You need to whitelist the URL for your app in the Allowed Web Origins field in your Application Settings. If you don't whitelist your application URL, the application will be unable to automatically refresh the authentication tokens and your users will be logged out the next time they visit the application, or refresh the page.

Integrate Auth0 in your Application

Loading auth0-spa-js

You need the auth0-spa-js library to integrate Auth0 into your application. You can either install the library locally in your application or load it from CDN.

Loading via dependencies

Install auth0-spa-js using npm or yarn.

Once auth0-spa-js is installed, reference it using an import statement (if you're using a build system such as Webpack):

Loading it from CDN

If you do not want to use a package manager, you can retrieve auth0-spa-js from Auth0's CDN.

If you encounter some problems or errors when using the new JavaScript SDK, please check out the FAQ to see if your issue is covered there.

Authentication with Auth0

Universal Login is the easiest way to set up authentication in your application. We recommend using it for the best experience, best security and the fullest array of features. This guide will use it to provide a way for your users to log in to your Angular 7+ application.

You can also embed the login dialog directly in your application using the Lock widget. If you use this method, some features, such as single sign-on, will not be accessible.

When a user logs in, Auth0 returns three items:

You can use these items in your application to set up and manage authentication.

This tutorial will guide you in modifying an Angular application to support login using Auth0, that demonstrates how users can log in, log out, and how to view their profile information. It will also show you how to protect routes from unauthenticated users.

This tutorial assumes that you're able to use the Angular CLI to generate new components and services on your project. If not, please place the files where appropriate and ensure that any references to them regarding import paths are correct for your scenario.

Create an Angular application

If you do not already have an application in which to implement the SDK, a new one can be generated using the Angular CLI.

Install the CLI:

Then use it to generate a new Angular application. When asked "Would you like to use Angular routing?", select yes:

Once the project has been created, open the auth0-angular-demo folder in your favorite code editor.

Finally, by default the application runs on port 4200. This should run on port 3000 so that it matches the Auth0 URLs configured above. This can be done inside the package.json file by modifying NPM's start command as follows:

If you are following this tutorial using your own Angular application that runs on a different port, you should modify the URLs above when configuring Auth0 so that they match the host and port number of your own application.

Install the SDK

While in the project folder, install the SDK using npm in the terminal:

Add an Authentication Service

To make it easier to use the Auth0 SDK within an Angular application, create an Angular service that can be injected into other components and services. This service can be used to set up and retrieve an instance of Auth0Client.

To start, generate a new service called Auth:

Open the src/app/auth.service.ts file inside your code editor and add the following content:

Make sure that the domain and client ID values are correct for the application that you want to connect with.

This service provides a single method getAuth0Client. When called, it will in turn call createAuth0Client from the Auth0 JS SDK and save it in a class-level variable. Subsequent calls to getAuth0Client will return the same instance.

Note that the redirect_uri property is configured to indicate where Auth0 should redirect to once authentication is complete. For login to work, this URL must be specified as an Allowed Callback URL in your application settings.

The service uses RxJS to emit changes in values to the isAuthenticated state and the user's profile. These will be used in a moment to listen for changes and update the UI accordingly.

Create a Navigation Bar Component

If you do not already have a logical place to house login and logout buttons within your application, create a new component to represent a navigation bar that can also hold some UI to log in and log out:

Open the src/app/navbar/navbar.component.ts file and replace its contents with the following:

Notice that the AuthService class you created in the previous section is being injected into the component through the constructor. This allows you to get an instance of the client, as well as react to changes in authentication state.

The main setup work is being carried out inside ngOnInit, where the RxJS BehaviorSubject instances are being used. Whenever the values of these change, the Navbar component will react to those changes and provide an updated UI. Functions are provided to log in and log out the user using loginWithRedirect and logout directly on the Auth0 client.

Next, configure the UI for the navbar component by opening the src/app/navbar/navbar.component.html file and replacing its contents with the following:

Angular bindings are used here to show each button at the right time; the Login button when the user is unauthenticated, and the Log Out button when the user has been authenticated. Their click events are wired up to call the login and logout functions on the component respectively.

Finally, to show this component on the screen, open the src/app/app.component.html file and replace the default UI with the following:

Checkpoint: Run the application now using npm start. The login button should be visible, and you should be able to click it to be redirected to Auth0 for login. If you log in and are redirected back to the app, you'll see an error in the console about a missing route. The callback route used when redirected back to the app is setup in the next section.

Handle Login Redirects

To log the user into your application, the redirect from Auth0 should be handled so that a proper login state can be achieved. To do this, the handleLoginRedirect SDK method must be called when Auth0 redirects back to your application. This can be done by using a separate component to handle the redirect callback.

Use the Angular CLI to create a new component called Callback:

Open the newly-generated src/app/callback/callback.component.ts file and replace its contents with the following:

Once again the AuthService class is injected so that the component can gain access to the Auth0 SDK client. The key line is await client.handleRedirectCallback, which processes the callback data from Auth0 and retrieves the tokens. It also sets some internal state that can be used to determine whether the user is authenticated or not.

Notice that the component updates the observable properties inside the AuthService instance. This means that other components that are watching these observables can update their UI at the right time: when the user logs in.

This component also recovers the URL the user was trying to reach before redirecting to Auth0 for authentication. They are then redirected to that URL to continue their journey through the site.

In order for this component to work, the Angular router must be adjusted so that this component is used when the /callback route is hit. Open src/app/app-routing.module.ts and replace its content with the following:

The primary change here is to add in the callback route which points to the CallbackComponent.

Checkpoint: Run the app again using npm start in the terminal. This time you should be able to log in and have the application handle the callback appropriately, sending you back to the default route. The "log out" button should now be visible. Check that the "log out" button works and that the user is unauthenticated when clicked.

Showing Profile Information

Create a new component called "Profile" using the Angular CLI:

Open src/app/profile/profile.component.ts and replace its contents with the following:

In order to retrieve the profile data, the component subscribes to changes on the profile property of AuthService and sets a class-level property to its value. This property can be used to drive the UI and show the profile information on the screen.

To do this, open src/app/profile/profile.component.html and replace its contents with the following:

This simple UI displays a JSON representation of the profile object, only if the profile property on the component has a value. This means that the UI will be present if the user is logged in, and invisible if they are not.

To view the profile page, the router must be updated to show the profile component at the right time. Open src/app/app-routing.module.ts and ensure that the routes map includes a route to the your profile component:

Finally, update the navigation bar to include some router links so that we can navigate between the different pages. Open src/app/navbar/navbar.component.html and update it to look like the following:

Run the application and log in. Click on the Profile link to browse to the /profile URL. Your profile information should now be present on the screen in JSON format. Try logging out of the application again to make sure that the profile information disappears as you would expect.

Gated Content

Right now, your users could simply enter the /profile path into their URL bar and reach the profile page, even if they're unauthenticated. You're going to use a Guard to help prevent that from happening.

Add an authentication guard

The Angular CLI can be used to generate a guard:

When asked the question "Which interfaces would you like to implement?", select "CanActivate".

Open the src/app/auth.guard.ts file and replace its contents with the following:

The key part here is the implementation of the canActivate method. First, the Auth0 client is retrieved. Then, the isAuthenticated value is interrogated. If the user is already authenticated, then true is returned to indicate that the current route can continue.

If the user is not authenticated, then the loginWithRedirect method is invoked, causing the user to be logged in. Also notice that the appState property in the options for loginWithRedirect is set to an object containing a target property. This value is set to the route that the user was trying to access when this guard was activated. We can use this to helpfully redirect the user to where they were trying to reach once they have successfully authenticated with Auth0.

In order for this guard to work, it must be applied to the router so that the /profile route cannot be accessed unless the user is logged in. Open the src/app/app-routing.module.ts file and update it so that the guard is used. It should look something like the following:

Check that the application works as intended, by logging out of the application, then trying to access http://localhost:3000/profile route directly in the URL bar. You should be automatically redirected to the Auth0 Login page before being able to access your profile information in the app. Note that the application should automatically route you to the /profile page after authentication.

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