Add static frontend support.

Author: imclint21

src/Initium/Extensions/StaticFrontendExtensions.cs

@@ -0,0 +1,30 @@
+using System.Diagnostics.CodeAnalysis;
+using Microsoft.AspNetCore.Builder;
+using Microsoft.Extensions.FileProviders;
+
+namespace Initium.Extensions;
+
+[SuppressMessage("ReSharper", "UnusedMethodReturnValue.Global")]
+public static class StaticFrontendExtensions
+{
+	public static IApplicationBuilder MapStaticFrontend(this IApplicationBuilder app, string clientPath)
+	{
+		app.UseDefaultFiles(new DefaultFilesOptions
+		{
+			FileProvider = new PhysicalFileProvider(clientPath),
+			RequestPath = "",
+			DefaultFileNames = new List<string> { "index.html" }
+		});
+
+		app.UseStaticFiles(new StaticFileOptions
+		{
+			FileProvider = new PhysicalFileProvider(clientPath),
+			RequestPath = ""
+		});
+
+		// TODO: A quoi sert MapFallbackToFile?
+		// app.MapFallbackToFile("index.html", Path.Combine(clientPath, "index.html"));
+
+		return app;
+	}
+}