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HttpMethodOverrideMiddleware.cs
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HttpMethodOverrideMiddleware.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.Builder;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Options;
namespace Microsoft.AspNetCore.HttpOverrides;
/// <summary>
/// A middleware for overriding the HTTP method of an incoming POST request.
/// </summary>
public class HttpMethodOverrideMiddleware
{
private const string xHttpMethodOverride = "X-Http-Method-Override";
private readonly RequestDelegate _next;
private readonly HttpMethodOverrideOptions _options;
/// <summary>
/// Create a new <see cref="HttpMethodOverrideMiddleware"/>.
/// </summary>
/// <param name="next">The <see cref="RequestDelegate"/> representing the next middleware in the pipeline.</param>
/// <param name="options">The <see cref="HttpMethodOverrideOptions"/> for configuring the middleware.</param>
public HttpMethodOverrideMiddleware(RequestDelegate next, IOptions<HttpMethodOverrideOptions> options)
{
if (next == null)
{
throw new ArgumentNullException(nameof(next));
}
if (options == null)
{
throw new ArgumentNullException(nameof(options));
}
_next = next;
_options = options.Value;
}
/// <summary>
/// Executes the middleware.
/// </summary>
/// <param name="context">The <see cref="HttpContext"/> for the current request.</param>
public Task Invoke(HttpContext context)
{
if (HttpMethods.IsPost(context.Request.Method))
{
if (_options.FormFieldName != null)
{
if (context.Request.HasFormContentType)
{
return InvokeCore(context);
}
}
else
{
var xHttpMethodOverrideValue = context.Request.Headers[xHttpMethodOverride];
if (!string.IsNullOrEmpty(xHttpMethodOverrideValue))
{
context.Request.Method = xHttpMethodOverrideValue.ToString();
}
}
}
return _next(context);
}
private async Task InvokeCore(HttpContext context)
{
var form = await context.Request.ReadFormAsync();
var methodType = form[_options.FormFieldName!];
if (!string.IsNullOrEmpty(methodType))
{
context.Request.Method = methodType.ToString();
}
await _next(context);
}
}