61 lines
1.9 KiB
C#
61 lines
1.9 KiB
C#
// Copyright (c) .NET Foundation. All rights reserved.
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// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
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using System;
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using System.Threading.Tasks;
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using Microsoft.AspNetCore.Http;
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namespace Microsoft.AspNetCore.Builder.Extensions
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{
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/// <summary>
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/// Respresents a middleware that runs a sub-request pipeline when a given predicate is matched.
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/// </summary>
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public class MapWhenMiddleware
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{
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private readonly RequestDelegate _next;
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private readonly MapWhenOptions _options;
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/// <summary>
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/// Creates a new instance of <see cref="MapWhenMiddleware"/>.
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/// </summary>
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/// <param name="next">The delegate representing the next middleware in the request pipeline.</param>
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/// <param name="options">The middleware options.</param>
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public MapWhenMiddleware(RequestDelegate next, MapWhenOptions options)
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{
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if (next == null)
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{
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throw new ArgumentNullException(nameof(next));
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}
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if (options == null)
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{
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throw new ArgumentNullException(nameof(options));
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}
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_next = next;
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_options = options;
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}
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/// <summary>
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/// Executes the middleware.
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/// </summary>
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/// <param name="context">The <see cref="HttpContext"/> for the current request.</param>
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/// <returns>A task that represents the execution of this middleware.</returns>
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public async Task Invoke(HttpContext context)
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{
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if (context == null)
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{
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throw new ArgumentNullException(nameof(context));
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}
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if (_options.Predicate(context))
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{
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await _options.Branch(context);
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}
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else
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{
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await _next(context);
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}
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}
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}
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} |