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using System;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Abstractions;
using Microsoft.AspNetCore.Mvc.Routing;
using Microsoft.AspNetCore.Routing;
using Microsoft.Extensions.DependencyInjection;
namespace Demo
{
public static class Extensions
{
// Step 1: Inject smuggler when building web host
public static IWebHostBuilder SniffRouteData(this IWebHostBuilder builder)
{
return builder.ConfigureServices(svc => svc.AddSingleton<Capture>());
}
// Step 2: Swipe the route data in application startup
public static IApplicationBuilder UseMvcAndSniffRoutes(this IApplicationBuilder app)
{
var capture = app.ApplicationServices.GetRequiredService<Capture>();
IRouteBuilder capturedRoutes = null;
app.UseMvc(routeBuilder => capturedRoutes = routeBuilder);
capture.Router = capturedRoutes?.Build();
return app;
}
// Step 3: Build the UrlHelper using the captured routes and webhost
public static IUrlHelper GetStaticUrlHelper(this IWebHost host, string baseUri)
=> GetStaticUrlHelper(host, new Uri(baseUri));
public static IUrlHelper GetStaticUrlHelper(this IWebHost host, Uri baseUri)
{
HttpContext httpContext = new DefaultHttpContext()
{
RequestServices = host.Services,
Request =
{
Scheme = baseUri.Scheme,
Host = HostString.FromUriComponent(baseUri),
PathBase = PathString.FromUriComponent(baseUri),
},
};
var captured = host.Services.GetRequiredService<Capture>();
var actionContext = new ActionContext
{
HttpContext = httpContext,
RouteData = new RouteData { Routers = { captured.Router }},
ActionDescriptor = new ActionDescriptor(),
};
return new UrlHelper(actionContext);
}
}
public class Capture
{
public IRouter Router { get; set; }
}
}
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