Add WireMock.Net.AspNetCore.Middleware (#1175)

* Add WireMock.Net.AspNetCore.Middleware

* .

* WireMock.Net.Middleware.Tests

* .

* X-WireMock-Response-Delay

src/WireMock.Net.AspNetCore.Middleware/ServiceCollectionExtensions.cs

@@ -0,0 +1,52 @@
+// Copyright © WireMock.Net
+
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Http;
+using Stef.Validation;
+using WireMock.Net.AspNetCore.Middleware.HttpDelegatingHandler;
+using WireMock.Server;
+using WireMock.Settings;
+
+namespace WireMock.Net.AspNetCore.Middleware;
+
+/// <summary>
+/// Extension methods for <see cref="IServiceCollection"/>.
+/// </summary>
+public static class ServiceCollectionExtensions
+{
+    /// <summary>
+    /// Adds all the components necessary to run WireMock.Net as a background service.
+    /// </summary>
+    public static IServiceCollection AddWireMockService(
+        this IServiceCollection services,
+        Action<WireMockServer> configure,
+        bool alwaysRedirectToWireMock = true,
+        WireMockServerSettings? settings = null
+    )
+    {
+        Guard.NotNull(services);
+        Guard.NotNull(configure);
+
+        services.AddTransient<WireMockDelegationHandler>();
+
+        services.AddSingleton(new WireMockServerInstance(configure, settings));
+
+        services.AddSingleton(new WireMockDelegationHandlerSettings
+        {
+            AlwaysRedirect = alwaysRedirectToWireMock
+        });
+
+        services.AddHostedService<WireMockBackgroundService>();
+        services.AddHttpClient();
+        services.AddHttpContextAccessor();
+        services.ConfigureAll<HttpClientFactoryOptions>(options =>
+        {
+            options.HttpMessageHandlerBuilderActions.Add(builder =>
+            {
+                builder.AdditionalHandlers.Add(builder.Services.GetRequiredService<WireMockDelegationHandler>());
+            });
+        });
+
+        return services;
+    }
+}