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KnownRouteValueConstraint.cs
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KnownRouteValueConstraint.cs
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// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc.Core;
using Microsoft.AspNetCore.Mvc.Infrastructure;
using Microsoft.AspNetCore.Routing;
using Microsoft.Extensions.DependencyInjection;
namespace Microsoft.AspNetCore.Mvc.Routing
{
public class KnownRouteValueConstraint : IRouteConstraint
{
private RouteValuesCollection _cachedValuesCollection;
public bool Match(
HttpContext httpContext,
IRouter route,
string routeKey,
RouteValueDictionary values,
RouteDirection routeDirection)
{
if (httpContext == null)
{
throw new ArgumentNullException(nameof(httpContext));
}
if (route == null)
{
throw new ArgumentNullException(nameof(route));
}
if (routeKey == null)
{
throw new ArgumentNullException(nameof(routeKey));
}
if (values == null)
{
throw new ArgumentNullException(nameof(values));
}
object obj;
if (values.TryGetValue(routeKey, out obj))
{
var value = obj as string;
if (value != null)
{
var allValues = GetAndCacheAllMatchingValues(routeKey, httpContext);
foreach (var existingValue in allValues)
{
if (string.Equals(value, existingValue, StringComparison.OrdinalIgnoreCase))
{
return true;
}
}
}
}
return false;
}
private string[] GetAndCacheAllMatchingValues(string routeKey, HttpContext httpContext)
{
var actionDescriptors = GetAndValidateActionDescriptorCollection(httpContext);
var version = actionDescriptors.Version;
var valuesCollection = _cachedValuesCollection;
if (valuesCollection == null ||
version != valuesCollection.Version)
{
var values = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
for (var i = 0; i < actionDescriptors.Items.Count; i++)
{
var action = actionDescriptors.Items[i];
string value;
if (action.RouteValues.TryGetValue(routeKey, out value) &&
!string.IsNullOrEmpty(value))
{
values.Add(value);
}
}
valuesCollection = new RouteValuesCollection(version, values.ToArray());
_cachedValuesCollection = valuesCollection;
}
return _cachedValuesCollection.Items;
}
private static ActionDescriptorCollection GetAndValidateActionDescriptorCollection(HttpContext httpContext)
{
var services = httpContext.RequestServices;
var provider = services.GetRequiredService<IActionDescriptorCollectionProvider>();
var descriptors = provider.ActionDescriptors;
if (descriptors == null)
{
throw new InvalidOperationException(
Resources.FormatPropertyOfTypeCannotBeNull("ActionDescriptors",
provider.GetType()));
}
return descriptors;
}
private class RouteValuesCollection
{
public RouteValuesCollection(int version, string[] items)
{
Version = version;
Items = items;
}
public int Version { get; }
public string[] Items { get; }
}
}
}