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StatusCodePagesExtensions.cs
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StatusCodePagesExtensions.cs
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// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
using System;
using System.Globalization;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Diagnostics;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Options;
namespace Microsoft.AspNetCore.Builder
{
public static class StatusCodePagesExtensions
{
/// <summary>
/// Adds a StatusCodePages middleware with the given options that checks for responses with status codes
/// between 400 and 599 that do not have a body.
/// </summary>
/// <param name="app"></param>
/// <param name="options"></param>
/// <returns></returns>
public static IApplicationBuilder UseStatusCodePages(this IApplicationBuilder app, StatusCodePagesOptions options)
{
if (app == null)
{
throw new ArgumentNullException(nameof(app));
}
if (options == null)
{
throw new ArgumentNullException(nameof(options));
}
return app.UseMiddleware<StatusCodePagesMiddleware>(Options.Create(options));
}
/// <summary>
/// Adds a StatusCodePages middleware with a default response handler that checks for responses with status codes
/// between 400 and 599 that do not have a body.
/// </summary>
/// <param name="app"></param>
/// <returns></returns>
public static IApplicationBuilder UseStatusCodePages(this IApplicationBuilder app)
{
if (app == null)
{
throw new ArgumentNullException(nameof(app));
}
return app.UseMiddleware<StatusCodePagesMiddleware>();
}
/// <summary>
/// Adds a StatusCodePages middleware with the specified handler that checks for responses with status codes
/// between 400 and 599 that do not have a body.
/// </summary>
/// <param name="app"></param>
/// <param name="handler"></param>
/// <returns></returns>
public static IApplicationBuilder UseStatusCodePages(this IApplicationBuilder app, Func<StatusCodeContext, Task> handler)
{
if (app == null)
{
throw new ArgumentNullException(nameof(app));
}
if (handler == null)
{
throw new ArgumentNullException(nameof(handler));
}
return app.UseStatusCodePages(new StatusCodePagesOptions
{
HandleAsync = handler
});
}
/// <summary>
/// Adds a StatusCodePages middleware with the specified response body to send. This may include a '{0}' placeholder for the status code.
/// The middleware checks for responses with status codes between 400 and 599 that do not have a body.
/// </summary>
/// <param name="app"></param>
/// <param name="contentType"></param>
/// <param name="bodyFormat"></param>
/// <returns></returns>
public static IApplicationBuilder UseStatusCodePages(this IApplicationBuilder app, string contentType, string bodyFormat)
{
if (app == null)
{
throw new ArgumentNullException(nameof(app));
}
return app.UseStatusCodePages(context =>
{
var body = string.Format(CultureInfo.InvariantCulture, bodyFormat, context.HttpContext.Response.StatusCode);
context.HttpContext.Response.ContentType = contentType;
return context.HttpContext.Response.WriteAsync(body);
});
}
/// <summary>
/// Adds a StatusCodePages middleware to the pipeline. Specifies that responses should be handled by redirecting
/// with the given location URL template. This may include a '{0}' placeholder for the status code. URLs starting
/// with '~' will have PathBase prepended, where any other URL will be used as is.
/// </summary>
/// <param name="app"></param>
/// <param name="locationFormat"></param>
/// <returns></returns>
public static IApplicationBuilder UseStatusCodePagesWithRedirects(this IApplicationBuilder app, string locationFormat)
{
if (app == null)
{
throw new ArgumentNullException(nameof(app));
}
if (locationFormat.StartsWith("~"))
{
locationFormat = locationFormat.Substring(1);
return app.UseStatusCodePages(context =>
{
var location = string.Format(CultureInfo.InvariantCulture, locationFormat, context.HttpContext.Response.StatusCode);
context.HttpContext.Response.Redirect(context.HttpContext.Request.PathBase + location);
return Task.CompletedTask;
});
}
else
{
return app.UseStatusCodePages(context =>
{
var location = string.Format(CultureInfo.InvariantCulture, locationFormat, context.HttpContext.Response.StatusCode);
context.HttpContext.Response.Redirect(location);
return Task.CompletedTask;
});
}
}
/// <summary>
/// Adds a StatusCodePages middleware to the pipeline with the specified alternate middleware pipeline to execute
/// to generate the response body.
/// </summary>
/// <param name="app"></param>
/// <param name="configuration"></param>
/// <returns></returns>
public static IApplicationBuilder UseStatusCodePages(this IApplicationBuilder app, Action<IApplicationBuilder> configuration)
{
if (app == null)
{
throw new ArgumentNullException(nameof(app));
}
var builder = app.New();
configuration(builder);
var tangent = builder.Build();
return app.UseStatusCodePages(context => tangent(context.HttpContext));
}
/// <summary>
/// Adds a StatusCodePages middleware to the pipeline. Specifies that the response body should be generated by
/// re-executing the request pipeline using an alternate path. This path may contain a '{0}' placeholder of the status code.
/// </summary>
/// <param name="app"></param>
/// <param name="pathFormat"></param>
/// <param name="queryFormat"></param>
/// <returns></returns>
public static IApplicationBuilder UseStatusCodePagesWithReExecute(
this IApplicationBuilder app,
string pathFormat,
string queryFormat = null)
{
if (app == null)
{
throw new ArgumentNullException(nameof(app));
}
return app.UseStatusCodePages(async context =>
{
var newPath = new PathString(
string.Format(CultureInfo.InvariantCulture, pathFormat, context.HttpContext.Response.StatusCode));
var formatedQueryString = queryFormat == null ? null :
string.Format(CultureInfo.InvariantCulture, queryFormat, context.HttpContext.Response.StatusCode);
var newQueryString = queryFormat == null ? QueryString.Empty : new QueryString(formatedQueryString);
var originalPath = context.HttpContext.Request.Path;
var originalQueryString = context.HttpContext.Request.QueryString;
// Store the original paths so the app can check it.
context.HttpContext.Features.Set<IStatusCodeReExecuteFeature>(new StatusCodeReExecuteFeature()
{
OriginalPathBase = context.HttpContext.Request.PathBase.Value,
OriginalPath = originalPath.Value,
OriginalQueryString = originalQueryString.HasValue ? originalQueryString.Value : null,
});
context.HttpContext.Request.Path = newPath;
context.HttpContext.Request.QueryString = newQueryString;
try
{
await context.Next(context.HttpContext);
}
finally
{
context.HttpContext.Request.QueryString = originalQueryString;
context.HttpContext.Request.Path = originalPath;
context.HttpContext.Features.Set<IStatusCodeReExecuteFeature>(null);
}
});
}
}
}