aliasvault/src/AliasVault.Client/Main/Models/FormValidation/StringDateFormatAttribute.cs

//-----------------------------------------------------------------------
// <copyright file="StringDateFormatAttribute.cs" company="lanedirt">
// Copyright (c) lanedirt. All rights reserved.
// Licensed under the MIT license. See LICENSE.md file in the project root for full license information.
// </copyright>
//-----------------------------------------------------------------------

namespace AliasVault.Client.Main.Models.FormValidation;

using System.ComponentModel.DataAnnotations;
using System.Globalization;

/// <summary>
/// Model validation attribute for date strings.
/// </summary>
/// <remarks>
/// Initializes a new instance of the <see cref="StringDateFormatAttribute"/> class.
/// </remarks>
/// <param name="format">The date format to validate.</param>
public class StringDateFormatAttribute(string format) : ValidationAttribute
{
    /// <summary>
    /// Check if the date string is in the correct format.
    /// </summary>
    /// <param name="value">The field value.</param>
    /// <param name="validationContext">ValidationContext.</param>
    /// <returns>ValidationResult.</returns>
    protected override ValidationResult IsValid(object? value, ValidationContext validationContext)
    {
        if (value is string dateString && DateTime.TryParseExact(dateString, format, CultureInfo.InvariantCulture, DateTimeStyles.None, out _))
        {
            return ValidationResult.Success!;
        }

        return new ValidationResult($"The date must be in the format {format}.", [validationContext.MemberName!]);
    }
}