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The answer can be found here:
- Secure Your .NET API in 15 Minutes: JWT Authentication: https://lnkd.in/dRJzp_Mz
- Easy Email Verification in .NET: FluentEmail + Papercut: https://lnkd.in/djaY4EXv
- Using Distributed Locking To Solve Race Conditions: https://lnkd.in/dMkvv5JE
- Best Practices for Secure Password Hashing in .NET: https://lnkd.in/dm9hp3_F
- Building Your First Clean Architecture Use Case: https://lnkd.in/d8V-z42c
You Should Know:
1. Secure JWT Authentication in .NET
// Install required packages
dotnet add package Microsoft.AspNetCore.Authentication.JwtBearer
// Configure JWT in Program.cs
builder.Services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
.AddJwtBearer(options =>
{
options.TokenValidationParameters = new TokenValidationParameters
{
ValidateIssuer = true,
ValidateAudience = true,
ValidateLifetime = true,
ValidateIssuerSigningKey = true,
ValidIssuer = builder.Configuration["Jwt:Issuer"],
ValidAudience = builder.Configuration["Jwt:Audience"],
IssuerSigningKey = new SymmetricSecurityKey(
Encoding.UTF8.GetBytes(builder.Configuration["Jwt:Key"]))
};
});
2. Email Verification with FluentEmail & Papercut
// Install FluentEmail & Papercut
dotnet add package FluentEmail.Core
dotnet add package FluentEmail.Smtp
// Configure in Program.cs
builder.Services.AddFluentEmail("[email protected]")
.AddSmtpSender(new SmtpClient("localhost", 25));
// Send email
var email = await Email
.From("[email protected]")
.To("[email protected]")
.Subject("Verify Email")
.Body("Click here to verify: <link>")
.SendAsync();
3. Distributed Locking for Race Conditions
// Using RedLock.net for distributed locks
dotnet add package RedLock.net
// Acquire a lock
var resource = "transaction-123";
var expiry = TimeSpan.FromSeconds(30);
using (var redLock = await redlockFactory.CreateLockAsync(resource, expiry))
{
if (redLock.IsAcquired)
{
// Critical section
}
}
4. Secure Password Hashing in .NET
// Using BCrypt for hashing
dotnet add package BCrypt.Net-Next
// Hash password
string hashedPassword = BCrypt.Net.BCrypt.HashPassword("plainPassword");
// Verify password
bool isValid = BCrypt.Net.BCrypt.Verify("plainPassword", hashedPassword);
5. Clean Architecture Use Case Implementation
// Define Use Case
public class CreateUserUseCase
{
private readonly IUserRepository _repository;
public CreateUserUseCase(IUserRepository repository)
{
_repository = repository;
}
public async Task Execute(User user)
{
await _repository.AddAsync(user);
}
}
What Undercode Say:
Combining Clean Architecture (CA) and Vertical Slice Architecture (VSA) ensures maintainability while keeping code modular. CA enforces separation of concerns (Domain, Application, Infrastructure), while VSA groups features vertically (e.g., `UserRegistration` includes endpoints, validation, and DB logic).
Key Commands & Practices:
- Linux: Use `htop` for monitoring, `grep -r “Jwt” /etc/` to find JWT configs.
- Windows: `netstat -ano | findstr “LISTEN”` checks active ports.
- .NET CLI: `dotnet watch run` for hot-reload development.
- Docker: `docker-compose up -d` to run dependencies (Redis, DB).
Expected Output:
A scalable, secure, and maintainable .NET API with:
✔ JWT Auth
✔ Email Verification
✔ Race-Condition Handling
✔ Secure Password Storage
✔ Clean Code Structure
References:
Reported By: Pavledavitkovic How – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
