/
OwinExtensions.cs
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/
OwinExtensions.cs
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Http.Features;
using Microsoft.AspNetCore.Owin;
namespace Microsoft.AspNetCore.Builder;
using AddMiddleware = Action<Func<
Func<IDictionary<string, object>, Task>,
Func<IDictionary<string, object>, Task>
>>;
using AppFunc = Func<IDictionary<string, object>, Task>;
using CreateMiddleware = Func<
Func<IDictionary<string, object>, Task>,
Func<IDictionary<string, object>, Task>
>;
/// <summary>
/// Extension methods to add OWIN to an HTTP application pipeline.
/// </summary>
public static class OwinExtensions
{
/// <summary>
/// Adds an OWIN pipeline to the specified <see cref="IApplicationBuilder"/>.
/// </summary>
/// <param name="builder">The <see cref="IApplicationBuilder"/> to add the pipeline to.</param>
/// <returns>An action used to create the OWIN pipeline.</returns>
public static AddMiddleware UseOwin(this IApplicationBuilder builder)
{
if (builder == null)
{
throw new ArgumentNullException(nameof(builder));
}
AddMiddleware add = middleware =>
{
Func<RequestDelegate, RequestDelegate> middleware1 = next1 =>
{
AppFunc exitMiddleware = env =>
{
return next1((HttpContext)env[typeof(HttpContext).FullName]);
};
var app = middleware(exitMiddleware);
return httpContext =>
{
// Use the existing OWIN env if there is one.
IDictionary<string, object> env;
var owinEnvFeature = httpContext.Features.Get<IOwinEnvironmentFeature>();
if (owinEnvFeature != null)
{
env = owinEnvFeature.Environment;
env[typeof(HttpContext).FullName] = httpContext;
}
else
{
env = new OwinEnvironment(httpContext);
}
return app.Invoke(env);
};
};
builder.Use(middleware1);
};
// Adapt WebSockets by default.
add(WebSocketAcceptAdapter.AdaptWebSockets);
return add;
}
/// <summary>
/// Adds OWIN middleware pipeline to the specified <see cref="IApplicationBuilder"/>.
/// </summary>
/// <param name="builder">The <see cref="IApplicationBuilder"/> to add the middleware to.</param>
/// <param name="pipeline">A delegate which can specify the OWIN pipeline.</param>
/// <returns>The original <see cref="IApplicationBuilder"/>.</returns>
public static IApplicationBuilder UseOwin(this IApplicationBuilder builder, Action<AddMiddleware> pipeline)
{
if (builder == null)
{
throw new ArgumentNullException(nameof(builder));
}
if (pipeline == null)
{
throw new ArgumentNullException(nameof(pipeline));
}
pipeline(builder.UseOwin());
return builder;
}
/// <summary>
/// Creates an <see cref="IApplicationBuilder"/> for an OWIN pipeline.
/// </summary>
/// <param name="app">The OWIN pipeline.</param>
/// <returns>An <see cref="IApplicationBuilder"/></returns>
public static IApplicationBuilder UseBuilder(this AddMiddleware app)
{
return app.UseBuilder(serviceProvider: null);
}
/// <summary>
/// Creates an <see cref="IApplicationBuilder"/> for an OWIN pipeline.
/// </summary>
/// <param name="app">The OWIN pipeline.</param>
/// <param name="serviceProvider">A service provider for <see cref="IApplicationBuilder.ApplicationServices"/>.</param>
/// <returns>An <see cref="IApplicationBuilder"/>.</returns>
public static IApplicationBuilder UseBuilder(this AddMiddleware app, IServiceProvider serviceProvider)
{
if (app == null)
{
throw new ArgumentNullException(nameof(app));
}
// Do not set ApplicationBuilder.ApplicationServices to null. May fail later due to missing services but
// at least that results in a more useful Exception than a NRE.
if (serviceProvider == null)
{
serviceProvider = new EmptyProvider();
}
// Adapt WebSockets by default.
app(OwinWebSocketAcceptAdapter.AdaptWebSockets);
var builder = new ApplicationBuilder(serviceProvider: serviceProvider);
var middleware = CreateMiddlewareFactory(exit =>
{
builder.Use(ignored => exit);
return builder.Build();
}, builder.ApplicationServices);
app(middleware);
return builder;
}
private static CreateMiddleware CreateMiddlewareFactory(Func<RequestDelegate, RequestDelegate> middleware, IServiceProvider services)
{
return next =>
{
var app = middleware(httpContext =>
{
return next(httpContext.Features.Get<IOwinEnvironmentFeature>().Environment);
});
return env =>
{
// Use the existing HttpContext if there is one.
HttpContext context;
object obj;
if (env.TryGetValue(typeof(HttpContext).FullName, out obj))
{
context = (HttpContext)obj;
context.Features.Set<IOwinEnvironmentFeature>(new OwinEnvironmentFeature() { Environment = env });
}
else
{
context = new DefaultHttpContext(
new FeatureCollection(
new OwinFeatureCollection(env)));
context.RequestServices = services;
}
return app.Invoke(context);
};
};
}
/// <summary>
/// Creates an <see cref="IApplicationBuilder"/> for an OWIN pipeline.
/// </summary>
/// <param name="app">The OWIN pipeline.</param>
/// <param name="pipeline">A delegate used to configure a middleware pipeline.</param>
/// <returns>An <see cref="IApplicationBuilder"/>.</returns>
public static AddMiddleware UseBuilder(this AddMiddleware app, Action<IApplicationBuilder> pipeline)
{
return app.UseBuilder(pipeline, serviceProvider: null);
}
/// <summary>
/// Creates an <see cref="IApplicationBuilder"/> for an OWIN pipeline.
/// </summary>
/// <param name="app">The OWIN pipeline.</param>
/// <param name="pipeline">A delegate used to configure a middleware pipeline.</param>
/// <param name="serviceProvider">A service provider for <see cref="IApplicationBuilder.ApplicationServices"/>.</param>
/// <returns>An <see cref="IApplicationBuilder"/>.</returns>
public static AddMiddleware UseBuilder(this AddMiddleware app, Action<IApplicationBuilder> pipeline, IServiceProvider serviceProvider)
{
if (app == null)
{
throw new ArgumentNullException(nameof(app));
}
if (pipeline == null)
{
throw new ArgumentNullException(nameof(pipeline));
}
var builder = app.UseBuilder(serviceProvider);
pipeline(builder);
return app;
}
private sealed class EmptyProvider : IServiceProvider
{
public object GetService(Type serviceType)
{
return null;
}
}
}