RR Education: Dotnet Learning

Authentication and Authorization in Blazor Authentication and Authorization in Blazor Blazor provides a seamless way to handle authentication and authorization, especially when using a Blazor WebAssembly Hosted application. This blog post will guide you through the process of adding secure user management to your app using ASP.NET Core Identity and Blazor's built-in components. 🎯 Learning Objectives By the end of this guide, you will be able to: Add authentication to a new Blazor WebAssembly Hosted app. Understand the role of key authentication components like `AuthenticationStateProvider`. Protect API endpoints from unauthorized access. Secure Razor pages and components using the `[Authorize]` attribute and the `<AuthorizeView>` component. ✅ Step-by-Step Demo: Add...

Dealing with Common Security Threats in Blazor WebAssembly Hosted App Dealing with Common Security Threats in Blazor WebAssembly Hosted App Security is a critical aspect of any web application. In this hands-on exercise, we'll explore how a Blazor WebAssembly Hosted application can be vulnerable to common threats like Cross-Site Scripting (XSS) and SQL Injection, and more importantly, how to fix them using the built-in features of ASP.NET Core and Blazor. 🔐 Lesson 1: Dealing with Common Security Threats in Web Applications Our goal is to understand how to protect a Blazor WebAssembly Hosted app against XSS and SQL Injection. 🛠 Step 0: Create a New Blazor WebAssembly Hosted App First, let's create our project using Visual Studio or the command line. dotnet new blazorwasm -ho -o SecureCommentDemo ...

Securing MVC-based Applications Using Blazor Securing MVC-based Applications Using Blazor Security is paramount in any web application, and Blazor, as a modern framework, provides robust tools to protect your applications from common threats. This guide will walk you through the essential concepts and practical steps for securing your Blazor applications, focusing on authentication, authorization, and guarding against common vulnerabilities. 🔐 1. Dealing with Common Security Threats in Web Applications Blazor, particularly when hosted on ASP.NET Core, inherits many of its security features. It's important to understand the most common threats to web applications to know how to defend against them. 📘 Key Concepts: **Injection Attacks (SQL Injection, Command Injection):** These happen when an attacker provides malicious input tha...

Hands-On Exercise: Calling a Custom gRPC Method from Blazor Server Hands-On Exercise: Calling a Custom gRPC Method from Blazor Server This exercise walks you through a common scenario: building a user dashboard where a Blazor Server application needs to fetch user details from a gRPC service by sending a user ID. This guide will cover creating the gRPC service, implementing its logic, consuming it from the Blazor app, and displaying the result on the UI. Step 1: Define the gRPC Contract with .proto File First, we'll define the service and message types in our gRPC contract. 1.1 Create `hello.proto` File Create a file named `hello.proto` in your gRPC server project at `GrpcDemo.Server/Protos/hello.proto`. syntax = "proto3"; option csharp_namespace = "GrpcDemo"; package user; service UserServ...

A Deep Dive into gRPC: The Architecture and Implementation Flow A Deep Dive into gRPC: The Architecture and Implementation Flow You've seen gRPC in action in our previous exercises, but have you ever wondered what's happening under the hood? This post will provide a comprehensive overview of gRPC, from its core concepts to the architectural flow, and compare it to the more familiar REST API model. We'll break down the purpose of each file and component to give you a complete picture. 🧠 Part 1: Conceptual Overview – How gRPC Works **gRPC** stands for **Google Remote Procedure Call**. At its core, it's a modern, high-performance framework for building APIs. The fundamental idea is to make a remote call to a method on a server feel just like calling a local method in your code. The process works like this: ...

Why You Need the Same .proto File in Both gRPC Server and Client 🎯 Why You Need the Same .proto File in Both gRPC Server and Client If you've followed the previous exercises, you've noticed that we've used the same `.proto` file in both our gRPC server and Blazor client projects. This isn't a coincidence or a quirk; it's a fundamental requirement of gRPC. This post will explain exactly why this is so important. 🔹 What is a `.proto` file? A `.proto` file, short for a Protocol Buffers definition file, is the cornerstone of gRPC communication. It's a simple text file that acts as a **contract** or a blueprint for your application's remote services. It defines two key things: **The Message Types:** These are the data structures, similar to C# classes or structs, that are used to send and receive data. **...