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UsePathBaseMiddleware.cs
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UsePathBaseMiddleware.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.Threading.Tasks;
using Microsoft.AspNetCore.Http;
namespace Microsoft.AspNetCore.Builder.Extensions
{
/// <summary>
/// Represents a middleware that extracts the specified path base from request path and postpend it to the request path base.
/// </summary>
public class UsePathBaseMiddleware
{
private readonly RequestDelegate _next;
private readonly PathString _pathBase;
/// <summary>
/// Creates a new instance of <see cref="UsePathBaseMiddleware"/>.
/// </summary>
/// <param name="next">The delegate representing the next middleware in the request pipeline.</param>
/// <param name="pathBase">The path base to extract.</param>
public UsePathBaseMiddleware(RequestDelegate next, PathString pathBase)
{
if (next == null)
{
throw new ArgumentNullException(nameof(next));
}
if (!pathBase.HasValue)
{
throw new ArgumentException($"{nameof(pathBase)} cannot be null or empty.");
}
_next = next;
_pathBase = pathBase;
}
/// <summary>
/// Executes the middleware.
/// </summary>
/// <param name="context">The <see cref="HttpContext"/> for the current request.</param>
/// <returns>A task that represents the execution of this middleware.</returns>
public async Task Invoke(HttpContext context)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
PathString matchedPath;
PathString remainingPath;
if (context.Request.Path.StartsWithSegments(_pathBase, out matchedPath, out remainingPath))
{
var originalPath = context.Request.Path;
var originalPathBase = context.Request.PathBase;
context.Request.Path = remainingPath;
context.Request.PathBase = originalPathBase.Add(matchedPath);
try
{
await _next(context);
}
finally
{
context.Request.Path = originalPath;
context.Request.PathBase = originalPathBase;
}
}
else
{
await _next(context);
}
}
}
}