Скачать или смотреть Understanding User Privileges in Blazor WebAssembly Applications

Learn how to effectively check and manage user privileges in your Blazor WebAssembly applications using ASP.NET server, ensuring a secure and tailored experience for users.
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This video is based on the question https://stackoverflow.com/q/64811949/ asked by the user 'Erik Thysell' ( https://stackoverflow.com/u/4663185/ ) and on the answer https://stackoverflow.com/a/64812763/ provided by the user 'Brian Parker' ( https://stackoverflow.com/u/1492496/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Managing User Privileges in Blazor WebAssembly Applications

When building applications with Blazor WebAssembly, one common requirement is to control what forms and inputs users can access or modify based on their authentication and authorization statuses. This guide will guide you through setting up such a system using ASP.NET Core, while also ensuring that your users have a secure and customized experience.

The Problem: User Privileges

In a typical Blazor WebAssembly app, you might need to display certain forms or options only to users who have specific roles or claims. For example:

Anonymous users should not access certain sensitive forms.

Logged-in users should only see options based on their role (like “Admin”) and associated claims (like their area of operation).

The goal is to filter views based on user roles and claims effectively and securely. Let’s see how to achieve this using some Blazor components and ASP.NET Core.

Solution Overview

The solution involves checking the user’s role and claims against your requirements in a way that ensures only the right content is displayed. Here’s a detailed breakdown of how to implement this in your Blazor WebAssembly application:

1. Use AuthorizeView for Role-Based Access

Using the AuthorizeView component simplifies content visibility management based on user roles. For example:

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In this example, only users authorized as "Admin" can see the content inside the Authorized section.

2. Check User Privileges via Server Call

To implement a combination of role and area check, the next step is to call your ASP.NET server from the Blazor client. Create a method to check user privileges:

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This method communicates with the server to determine a user’s view privileges based on their claims and role.

3. Server-Side Validation

On the server side, implement the logic to verify user claims as follows:

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This server-side code ensures that the checks for user privileges are securely executed on the server, thus protecting sensitive data.

4. Conditional Rendering in Razor

Finally, implement conditional rendering based on user privileges in your Razor file:

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This will display the form only if the user has the necessary permissions.

Conclusion

The security of your application’s data is paramount. Checking user privileges only on the server, rather than the client-side code in the browser, minimizes potential exposure to unauthorized access. As a reminder, always validate and filter data on the server to maintain user integrity and safety.

By following these steps, you can effectively manage user privileges in your Blazor WebAssembly application, offering users a tailored experience while ensuring that sensitive functionalities are protected.