/
LengthRouteConstraint.cs
102 lines (87 loc) · 3.5 KB
/
LengthRouteConstraint.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 System.Globalization;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Routing.Matching;
namespace Microsoft.AspNetCore.Routing.Constraints;
/// <summary>
/// Constrains a route parameter to be a string of a given length or within a given range of lengths.
/// </summary>
public class LengthRouteConstraint : IRouteConstraint, IParameterLiteralNodeMatchingPolicy, ICachableParameterPolicy
{
/// <summary>
/// Initializes a new instance of the <see cref="LengthRouteConstraint" /> class that constrains
/// a route parameter to be a string of a given length.
/// </summary>
/// <param name="length">The length of the route parameter.</param>
public LengthRouteConstraint(int length)
{
if (length < 0)
{
var errorMessage = Resources.FormatArgumentMustBeGreaterThanOrEqualTo(0);
throw new ArgumentOutOfRangeException(nameof(length), length, errorMessage);
}
MinLength = MaxLength = length;
}
/// <summary>
/// Initializes a new instance of the <see cref="LengthRouteConstraint" /> class that constrains
/// a route parameter to be a string of a given length.
/// </summary>
/// <param name="minLength">The minimum length allowed for the route parameter.</param>
/// <param name="maxLength">The maximum length allowed for the route parameter.</param>
public LengthRouteConstraint(int minLength, int maxLength)
{
if (minLength < 0)
{
var errorMessage = Resources.FormatArgumentMustBeGreaterThanOrEqualTo(0);
throw new ArgumentOutOfRangeException(nameof(minLength), minLength, errorMessage);
}
if (maxLength < 0)
{
var errorMessage = Resources.FormatArgumentMustBeGreaterThanOrEqualTo(0);
throw new ArgumentOutOfRangeException(nameof(maxLength), maxLength, errorMessage);
}
if (minLength > maxLength)
{
var errorMessage =
Resources.FormatRangeConstraint_MinShouldBeLessThanOrEqualToMax("minLength", "maxLength");
throw new ArgumentOutOfRangeException(nameof(minLength), minLength, errorMessage);
}
MinLength = minLength;
MaxLength = maxLength;
}
/// <summary>
/// Gets the minimum length allowed for the route parameter.
/// </summary>
public int MinLength { get; }
/// <summary>
/// Gets the maximum length allowed for the route parameter.
/// </summary>
public int MaxLength { get; }
/// <inheritdoc />
public bool Match(
HttpContext? httpContext,
IRouter? route,
string routeKey,
RouteValueDictionary values,
RouteDirection routeDirection)
{
ArgumentNullException.ThrowIfNull(routeKey);
ArgumentNullException.ThrowIfNull(values);
if (values.TryGetValue(routeKey, out var value) && value != null)
{
var valueString = Convert.ToString(value, CultureInfo.InvariantCulture)!;
return CheckConstraintCore(valueString);
}
return false;
}
private bool CheckConstraintCore(string valueString)
{
var length = valueString.Length;
return length >= MinLength && length <= MaxLength;
}
bool IParameterLiteralNodeMatchingPolicy.MatchesLiteral(string parameterName, string literal)
{
return CheckConstraintCore(literal);
}
}