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I am creating an internet store. And I want to add short URLs for products, categories and so on.
For example:

store.com/iphone-7-plus

This link should open the page with iPhone 7 plus product.

The logic is:

1. The server receives an URL


2. The server try it against existent routes


3. If there is no any route for this path - the server looks at a DB and try to find a product or category with such title.

Obvious solutions and why are they not applicable:

The first solution is a new route like that:

public class StringRouter : IRouter

 private readonly IRouter _defaultRouter;

 public StringRouter(IRouter defaultRouter)
 
 _defaultRouter = defaultRouter;
 

 public async Task RouteAsync(RouteContext context)
 
 // special loggic

 await _defaultRouter.RouteAsync(context);
 

 public VirtualPathData GetVirtualPath(VirtualPathContext context)
 
 return _defaultRouter.GetVirtualPath(context);
 

The problem is I can't provide any access to my DB from StringRouter.

The second solution is:

public class MasterController : Controller

 [Route("path")]
 public IActionResult Map(string path)
 
 // some logic
 

The problem is the server receive literally all callings like store.com/robots.txt

So the question is still open - could you please advise me some applicable solution?

For accessing DbContext, you could try :

 using Microsoft.Extensions.DependencyInjection;

 public async Task RouteAsync(RouteContext context)
 
 var dbContext = context.HttpContext.RequestServices.GetRequiredService<RouterProContext>();
 var products = dbContext.Product.ToList();
 await _defaultRouter.RouteAsync(context);
 

You also could try Middleware to check whether the reuqest is not exist, and then return the expected response.

 public void Configure(IApplicationBuilder app, IHostingEnvironment env, IServiceProvider serviceProvider)
 
 app.Use(async (context,next) => 

 await next.Invoke();
 // add your own business logic to check this if statement
 if (context.Response.StatusCode == 404)
 
 var db = context.RequestServices.GetRequiredService<RouterProContext>();
 var users = db.Users.ToList();
 await context.Response.WriteAsync("Request From Middleware");
 
 );
 //your rest code