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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.
#nullable enable
using Microsoft.AspNetCore.Mvc.Filters;
using Microsoft.AspNetCore.Mvc.Infrastructure;
namespace Microsoft.AspNetCore.Mvc.ModelBinding;
/// <summary>
/// A filter that scans for <see cref="UnsupportedContentTypeException"/> in the
/// <see cref="ActionContext.ModelState"/> and short-circuits the pipeline
/// with an Unsupported Media Type (415) response.
/// </summary>
public class UnsupportedContentTypeFilter : IActionFilter, IOrderedFilter
{
/// <summary>
/// Gets or sets the filter order. <see cref="IOrderedFilter.Order"/>.
/// <para>
/// Defaults to <c>-3000</c> to ensure it executes before <see cref="ModelStateInvalidFilter"/>.
/// </para>
/// </summary>
public int Order { get; set; } = -3000;
/// <inheritdoc />
public void OnActionExecuting(ActionExecutingContext context)
{
if (HasUnsupportedContentTypeError(context))
{
context.Result = new UnsupportedMediaTypeResult();
}
}
private static bool HasUnsupportedContentTypeError(ActionExecutingContext context)
{
var modelState = context.ModelState;
if (modelState.IsValid)
{
return false;
}
foreach (var kvp in modelState)
{
var errors = kvp.Value.Errors;
for (var i = 0; i < errors.Count; i++)
{
var error = errors[i];
if (error.Exception is UnsupportedContentTypeException)
{
return true;
}
}
}
return false;
}
/// <inheritdoc />
public void OnActionExecuted(ActionExecutedContext context)
{
}
}
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