make prerender an extension

Author: isaacrlevin

Server/Controllers/HomeController.cs

@@ -19,7 +19,7 @@ public class HomeController : Controller
     [HttpGet]
     public async Task<IActionResult> Index()
     {
-      var prerenderResult = await Prerender.BuildPrerender(Request);
+      var prerenderResult = await Request.BuildPrerender();
 
       ViewData["SpaHtml"] = prerenderResult.Html; // our <app> from Angular
       ViewData["Title"] = prerenderResult.Globals["title"]; // set our <title> from Angular

Server/Helpers/HttpRequestExtensions.cs

@@ -1,5 +1,10 @@
 using Asp2017.Server.Models;
+using Microsoft.AspNetCore.Hosting;
 using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Http.Features;
+using Microsoft.AspNetCore.NodeServices;
+using Microsoft.AspNetCore.SpaServices.Prerendering;
+using Microsoft.Extensions.DependencyInjection;
 using System;
 using System.Collections.Generic;
 using System.Linq;
@@ -19,5 +24,42 @@ public static IRequest AbstractRequestInfo(this HttpRequest request)
 
       return requestSimplified;
     }
+
+    public static async Task<RenderToStringResult> BuildPrerender(this HttpRequest Request)
+    {
+      var nodeServices = Request.HttpContext.RequestServices.GetRequiredService<INodeServices>();
+      var hostEnv = Request.HttpContext.RequestServices.GetRequiredService<IHostingEnvironment>();
+
+      var applicationBasePath = hostEnv.ContentRootPath;
+      var requestFeature = Request.HttpContext.Features.Get<IHttpRequestFeature>();
+      var unencodedPathAndQuery = requestFeature.RawTarget;
+      var unencodedAbsoluteUrl = $"{Request.Scheme}://{Request.Host}{unencodedPathAndQuery}";
+
+      // ** TransferData concept **
+      // Here we can pass any Custom Data we want !
+
+      // By default we're passing down Cookies, Headers, Host from the Request object here
+      TransferData transferData = new TransferData();
+      transferData.request = Request.AbstractRequestInfo();
+      transferData.thisCameFromDotNET = "Hi Angular it's asp.net :)";
+      // Add more customData here, add it to the TransferData class
+
+      //Prerender now needs CancellationToken
+      System.Threading.CancellationTokenSource cancelSource = new System.Threading.CancellationTokenSource();
+      System.Threading.CancellationToken cancelToken = cancelSource.Token;
+
+      // Prerender / Serialize application (with Universal)
+      return await Prerenderer.RenderToString(
+                "/",
+                nodeServices,
+                cancelToken,
+                new JavaScriptModuleExport(applicationBasePath + "/ClientApp/dist/main-server"),
+                unencodedAbsoluteUrl,
+                unencodedPathAndQuery,
+                transferData, // Our simplified Request object & any other CustommData you want to send!
+                30000,
+                Request.PathBase.ToString()
+            );
+    }
   }
 }