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Authenticate and authorize Static Web Apps

  • How-to

Azure Static Web Apps provides a streamlined authentication experience, where no extra configuration is required to use GitHub and Microsoft Entra ID for authentication.

In this article, learn about default behavior, how to set up sign-in and sign-out, how to block an authentication provider, and more.

You can register a custom provider, which disables all pre-configured providers.

Warning

Due to changes in X (formerly Twitter) API policy, support is not available as part of the pre-configured providers for your app. If you want to continue to use X (formerly Twitter) for authentication/authorization with your app, update your app configuration to register a custom provider.

Prerequisites

Be aware of the following defaults and resources for authentication and authorization with Azure Static Web Apps.

Defaults:

  • Any user can authenticate with a preconfigured provider
    • GitHub
    • Microsoft Entra ID
    • To restrict an authentication provider, block access with a custom route rule
  • After sign-in, users belong to the anonymous and authenticated roles. For more information about roles, see Manage roles

Resources:

Set up sign-in

Azure Static Web Apps uses the /.auth system folder to provide access to authorization-related APIs. Rather than expose any of the routes under the /.auth folder directly to end users, create routing rules for friendly URLs.

Use the following table to find the provider-specific route.

Authorization provider Sign in route
Microsoft Entra ID /.auth/login/aad
GitHub /.auth/login/github

For example, to sign in with GitHub, you could use a URL similar to the following example.

<a href="/.auth/login/github">Login</a>

If you chose to support more than one provider, use a provider-specific link for each provider on your website. Use a route rule to map a default provider to a friendly route like /login.

{
  "route": "/login",
  "redirect": "/.auth/login/github"
}

Set up post-sign-in redirect

You can return a user to a specific page after they sign in by providing a fully qualified URL in the post_login_redirect_uri query string parameter.

<a href="/.auth/login/github?post_login_redirect_uri=https://zealous-water.azurestaticapps.net/success">Login</a>

You can also redirect unauthenticated users back to the referring page after they sign in. To add this redirect, create a response override rule that sets post_login_redirect_uri to .referrer, like in the following example.

{
  "responseOverrides": {
    "401": {
      "redirect": "/.auth/login/github?post_login_redirect_uri=.referrer",
      "statusCode": 302
    }
  }
}

Set up sign-out

The /.auth/logout route signs users out from the website. You can add a link to your site navigation to allow the user to sign out, like in the following example.

<a href="/.auth/logout">Log out</a>

Use a route rule to map a friendly route like /logout.

{
  "route": "/logout",
  "redirect": "/.auth/logout"
}

Set up post-sign-out redirect

To return a user to a specific page after they sign out, provide a URL in post_logout_redirect_uri query string parameter.

Block an authentication provider

By default, all authentication providers are enabled, but you may want to restrict your app from using a provider. For instance, your app may want to only use providers that expose email addresses.

To block a provider, create a route rule to return a 404 status code for requests to the blocked provider-specific route. For example, to restrict X (formerly Twitter) as provider, add the following route rule.

{
  "route": "/.auth/login/twitter",
  "statusCode": 404
}

Remove personal data

When you grant consent to an application as an end user, the application has access to your email address or username, depending on the identity provider. Once this information is provided, the owner of the application can decide how to manage personal data.

End users need to contact administrators of individual web apps to revoke this information from their systems.

To remove personal data from the Azure Static Web Apps platform, and prevent the platform from providing this information on future requests, submit a request using the following URL:

https://identity.azurestaticapps.net/.auth/purge/<AUTHENTICATION_PROVIDER_NAME>

To prevent the platform from providing this information on future requests to individual apps, submit a request using the following URL:

https://<WEB_APP_DOMAIN_NAME>/.auth/purge/<AUTHENTICATION_PROVIDER_NAME>

If you're using Microsoft Entra ID, use aad as the value for the <AUTHENTICATION_PROVIDER_NAME> placeholder.

Tip

For information about general restrictions and limitations, see Quotas.

Next step

Use routes to set allowed roles to control page access