jellyfin/Jellyfin.Api/Middleware/QueryStringDecodingMiddleware.cs

using System.Threading.Tasks;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Http.Features;

namespace Jellyfin.Api.Middleware
{
    /// <summary>
    /// URL decodes the querystring before binding.
    /// </summary>
    public class QueryStringDecodingMiddleware
    {
        private readonly RequestDelegate _next;

        /// <summary>
        /// Initializes a new instance of the <see cref="QueryStringDecodingMiddleware"/> class.
        /// </summary>
        /// <param name="next">The next delegate in the pipeline.</param>
        public QueryStringDecodingMiddleware(RequestDelegate next)
        {
            _next = next;
        }

        /// <summary>
        /// Executes the middleware action.
        /// </summary>
        /// <param name="httpContext">The current HTTP context.</param>
        /// <returns>The async task.</returns>
        public async Task Invoke(HttpContext httpContext)
        {
            var feature = httpContext.Features.Get<IQueryFeature>();
            if (feature is not null)
            {
                httpContext.Features.Set<IQueryFeature>(new UrlDecodeQueryFeature(feature));
            }

            await _next(httpContext).ConfigureAwait(false);
        }
    }
}