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using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using MediaBrowser.Common.Extensions;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Http.Features;
using Microsoft.Extensions.Primitives;
namespace Jellyfin.Server.Middleware
{
/// <summary>
/// Defines the <see cref="UrlDecodeQueryFeature"/>.
/// </summary>
public class UrlDecodeQueryFeature : IQueryFeature
{
private IQueryCollection? _store;
/// <summary>
/// Initializes a new instance of the <see cref="UrlDecodeQueryFeature"/> class.
/// </summary>
/// <param name="feature">The <see cref="IQueryFeature"/> instance.</param>
public UrlDecodeQueryFeature(IQueryFeature feature)
{
Query = feature.Query;
}
/// <summary>
/// Gets or sets a value indicating the url decoded <see cref="IQueryCollection"/>.
/// </summary>
public IQueryCollection Query
{
get
{
return _store ?? QueryCollection.Empty;
}
set
{
// Only interested in where the querystring is encoded which shows up as one key with nothing in the value.
if (value.Count != 1)
{
_store = value;
return;
}
// Encoded querystrings have no value, so don't process anything if a value is present.
var (key, stringValues) = value.First();
if (!string.IsNullOrEmpty(stringValues))
{
_store = value;
return;
}
// Unencode and re-parse querystring.
var unencodedKey = HttpUtility.UrlDecode(key);
if (string.Equals(unencodedKey, key, StringComparison.Ordinal))
{
// Don't do anything if it's not encoded.
_store = value;
return;
}
var pairs = new Dictionary<string, StringValues>();
var queryString = unencodedKey.SpanSplit('&');
foreach (var pair in queryString)
{
var i = pair.IndexOf('=');
if (i == -1)
{
// encoded is an equals.
// We use TryAdd so duplicate keys get ignored
pairs.TryAdd(pair.ToString(), StringValues.Empty);
continue;
}
var k = pair[..i].ToString();
var v = pair[(i + 1)..].ToString();
if (!pairs.TryAdd(k, new StringValues(v)))
{
pairs[k] = StringValues.Concat(pairs[k], v);
}
}
_store = new QueryCollection(pairs);
}
}
}
}
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