Resolving Redirection Issues in Angular Apps on Amazon S3 with OKTA Integration

Описание: Discover how to tackle `angular` app redirection problems when hosted on Amazon S3 with OKTA's OIDC authentication. Learn the step-by-step solution and tips for seamless integration.
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Solving Redirection Issues in Angular Applications on Amazon S3 with OKTA

Have you ever encountered a frustrating redirection issue while hosting your Angular application on Amazon S3, particularly when integrating with OKTA's OIDC authentication? This problem can be overwhelming, especially when errors like "404 Not Found" pop up during the login process. In this guide, we’ll explore how to address this specific issue, ensuring your application’s authentication flows smoothly.

Understanding the Problem

In this case, an Angular 9 application was successfully deployed as a static website on Amazon S3, and integrated with the OKTA OIDC authentication provider using the Authorization grant with PKCE flow. However, upon clicking the login button, the application would redirect to OKTA for authentication, only to return with a "404 Not Found" error when attempting to access the callback URL. This occurred because Amazon S3 could not find the specified key for the implicit/callback during the redirection.

Key Factors:

Angular App: Built and uploaded to Amazon S3

Static Website Hosting: Setup via Amazon S3

CloudFront Distribution: Used to route traffic

Hosted Domain: Managed via Route 53 to CloudFront

Step-by-Step Solution

Fortunately, this issue can be resolved with a series of corrective actions, as outlined below.

1. Configure Redirection Rules in Your S3 Bucket

Setting up proper redirection rules in your S3 bucket is crucial for handling requests correctly. Here’s how to do it:

Create rules in the S3 bucket for redirection:

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2. Update CloudFront Behavior

Next, ensure that your CloudFront distribution is configured correctly to handle query strings. To do this:

Go to your CloudFront distribution settings.

Select the behavior for your distribution and choose "Forward all, cache based on all" under the "Query String Forwarding and Caching" settings. This handles all parameters passed in the URL during redirection.

3. Set Up Error Document in CloudFront

It’s also essential to direct error responses correctly. In CloudFront:

Go to "Error Pages" settings and set the Error Document to index.html for both 403 and 404 errors. This way, if an error occurs, users will still be routed to your application rather than seeing a broken page.

4. Modify Your Angular Application

Finally, add a small piece of JavaScript in your Angular app’s index.html file to help manage the redirection state effectively. Here’s an example code snippet:

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Conclusion

By following these steps, you can efficiently resolve redirection issues in your Angular applications hosted on Amazon S3 while integrating with OKTA’s OIDC authentication. Make sure to properly configure your S3 bucket, CloudFront settings, and include necessary JavaScript in your application for a seamless user experience. With these adjustments, your application should now handle logins without returning 404 errors, providing a smoother authentication experience for your users.

If you have any questions or further issues, feel free to leave a comment below! Happy coding!