92 lines
3.5 KiB
C#
92 lines
3.5 KiB
C#
// Copyright (c) .NET Foundation. All rights reserved.
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// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
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using System;
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using System.Collections.Generic;
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using System.Globalization;
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using Microsoft.AspNet.Http;
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using Microsoft.Framework.Internal;
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namespace Microsoft.AspNet.Routing.Constraints
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{
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/// <summary>
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/// Constrains a route parameter to be a string of a given length or within a given range of lengths.
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/// </summary>
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public class LengthRouteConstraint : IRouteConstraint
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{
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/// <summary>
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/// Initializes a new instance of the <see cref="LengthRouteConstraint" /> class that constrains
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/// a route parameter to be a string of a given length.
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/// </summary>
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/// <param name="length">The length of the route parameter.</param>
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public LengthRouteConstraint(int length)
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{
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if (length < 0)
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{
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var errorMessage = Resources.FormatArgumentMustBeGreaterThanOrEqualTo(0);
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throw new ArgumentOutOfRangeException("length", length, errorMessage);
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}
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MinLength = MaxLength = length;
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="LengthRouteConstraint" /> class that constrains
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/// a route parameter to be a string of a given length.
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/// </summary>
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/// <param name="minLength">The minimum length allowed for the route parameter.</param>
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/// <param name="maxLength">The maximum length allowed for the route parameter.</param>
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public LengthRouteConstraint(int minLength, int maxLength)
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{
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if (minLength < 0)
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{
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var errorMessage = Resources.FormatArgumentMustBeGreaterThanOrEqualTo(0);
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throw new ArgumentOutOfRangeException("minLength", minLength, errorMessage);
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}
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if (maxLength < 0)
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{
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var errorMessage = Resources.FormatArgumentMustBeGreaterThanOrEqualTo(0);
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throw new ArgumentOutOfRangeException("maxLength", maxLength, errorMessage);
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}
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if (minLength > maxLength)
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{
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var errorMessage =
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Resources.FormatRangeConstraint_MinShouldBeLessThanOrEqualToMax("minLength", "maxLength");
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throw new ArgumentOutOfRangeException("minLength", minLength, errorMessage);
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}
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MinLength = minLength;
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MaxLength = maxLength;
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}
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/// <summary>
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/// Gets the minimum length allowed for the route parameter.
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/// </summary>
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public int MinLength { get; private set; }
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/// <summary>
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/// Gets the maximum length allowed for the route parameter.
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/// </summary>
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public int MaxLength { get; private set; }
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/// <inheritdoc />
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public bool Match([NotNull] HttpContext httpContext,
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[NotNull] IRouter route,
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[NotNull] string routeKey,
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[NotNull] IDictionary<string, object> values,
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RouteDirection routeDirection)
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{
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object value;
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if (values.TryGetValue(routeKey, out value) && value != null)
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{
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var valueString = Convert.ToString(value, CultureInfo.InvariantCulture);
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var length = valueString.Length;
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return length >= MinLength && length <= MaxLength;
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}
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return false;
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}
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}
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} |