Book Image

Modern Web Development with ASP.NET Core 3 - Second Edition

By : Ricardo Peres
Book Image

Modern Web Development with ASP.NET Core 3 - Second Edition

By: Ricardo Peres

Overview of this book

ASP.NET has been the preferred choice of web developers for a long time. With ASP.NET Core 3, Microsoft has made internal changes to the framework along with introducing new additions that will change the way you approach web development. This second edition has been thoroughly updated to help you make the most of the latest features in the framework, right from gRPC and conventions to Blazor, which has a new chapter dedicated to it. You’ll begin with an overview of the essential topics, exploring the Model-View-Controller (MVC) pattern, various platforms, dependencies, and frameworks. Next, you’ll learn how to set up and configure the MVC environment, before delving into advanced routing options. As you advance, you’ll get to grips with controllers and actions to process requests, and later understand how to create HTML inputs for models. Moving on, you'll discover the essential aspects of syntax and processes when working with Razor. You'll also get up to speed with client-side development and explore the testing, logging, scalability, and security aspects of ASP.NET Core. Finally, you'll learn how to deploy ASP.NET Core to several environments, such as Azure, Amazon Web Services (AWS), and Docker. By the end of the book, you’ll be well versed in development in ASP.NET Core and will have a deep understanding of how to interact with the framework and work cross-platform.
Table of Contents (26 chapters)
Section 1: The Fundamentals of ASP.NET Core 3
Section 2: Improving Productivity
Section 3: Advanced Topics
Appendix A: The dotnet Tool

Applying security

Here, we will see how we can enforce security rules in a Blazor app. In this context, we will we cover authentication and authorization, the two main topics of security, and also briefly talk about Cross-Origin Resource Sharing (CORS).

Requesting authorization

Blazor uses the same authentication mechanism as ASP.NET Core—that is, based on cookies: if we are authenticated to ASP.NET Core, then we are authenticated to Blazor. As for authorization, Blazor resources (pages) are protected by applying an [Authorize] attribute, with or without properties (roles or policies—policies are more generic). Attributes can be applied to a page either by applying an @attribute directive on a .razor file or on a .cs code-behind file, like this:

          [Authorize(Roles = "Admin")]
Mind you, it is pointless to apply [Authorize] attributes to components—they only make sense...