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Minimal APIs in .NET provide a lightweight way to build HTTP services with minimal setup. A common challenge is applying filters (like API key validation) to multiple endpoints without duplicating code. The solution involves using MapGroup and Endpoint Filters to centralize logic.
Key Steps
1. Group Endpoints with `MapGroup`
var group = app.MapGroup("/api/secure").RequireAuthorization();
2. Add Endpoint Filters
group.AddEndpointFilter(async (context, next) => {
if (!context.HttpContext.Request.Headers.ContainsKey("X-API-Key"))
return Results.Unauthorized();
return await next(context);
});
You Should Know:
- Multiple Filters: Chain filters with
AddEndpointFilter.group.AddEndpointFilter<LoggingFilter>(); group.AddEndpointFilter<RateLimiterFilter>();
- Async Support: Filters fully support async operations.
- Real-World Use:
- API key validation
- Rate limiting
- Logging
- Request/Response modification
Linux/Windows Commands for API Security
- Linux (Audit API Traffic):
sudo tcpdump -i eth0 port 443 -w api_traffic.pcap
- Windows (Test API Endpoints):
Invoke-RestMethod -Uri "https://api.example.com/secure" -Headers @{"X-API-Key"="your-key"}
What Undercode Say
Minimal APIs streamline development, but security remains critical. Use `MapGroup` to enforce consistency and filters to modularize cross-cutting concerns. Combine this with network-level monitoring (e.g., tcpdump) and automated testing (e.g., PowerShell/Python scripts) for robust API governance.
Expected Output:
A secure, maintainable API with centralized logic and minimal boilerplate.
URLs for Further Reading:
References:
Reported By: Pavledavitkovic How – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
