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/*
* Copyright (c) 2022 Vaughn Nugent
*
* Library: VNLib
* Package: VNLib.Plugins.Extensions.Validation
* File: ValidationExtensions.cs
*
* ValidationExtensions.cs is part of VNLib.Plugins.Extensions.Validation which is part of the larger
* VNLib collection of libraries and utilities.
*
* VNLib.Plugins.Extensions.Validation is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* VNLib.Plugins.Extensions.Validation is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see https://www.gnu.org/licenses/.
*/
using System;
using System.Diagnostics.CodeAnalysis;
using FluentValidation;
using FluentValidation.Results;
#nullable enable
namespace VNLib.Plugins.Extensions.Validation
{
/// <summary>
/// Provides shortcut methods to aid programmatic validation of objects
/// </summary>
public static class ValidationExtensions
{
/// <summary>
/// If <paramref name="assertion"/> evalues to false, sets the specified assertion message
/// to the <see cref="WebMessage.Result"/> to the specified string
/// </summary>
/// <param name="webm"></param>
/// <param name="assertion">The result of the assertion</param>
/// <param name="message">The error message to store when the value is false</param>
/// <returns>The inverse of <paramref name="assertion"/></returns>
public static bool Assert(this WebMessage webm, [DoesNotReturnIf(false)] bool assertion, string message)
{
if(!assertion)
{
webm.Success = false;
webm.Result = message;
}
return !assertion;
}
/// <summary>
/// Validates the specified instance, and stores errors to the specified <paramref name="webMessage"/>
/// and sets the <see cref="ValErrWebMessage.IsError"/>
/// </summary>
/// <param name="instance">The instance to validate</param>
/// <param name="validator"></param>
/// <param name="webMessage">The <see cref="ValErrWebMessage"/> to store errors to</param>
/// <returns>True if the result of the validation is valid, false otherwise and the <paramref name="webMessage"/> is not modified</returns>
public static bool Validate<T>(this IValidator<T> validator, T instance, ValErrWebMessage webMessage)
{
//Validate value
ValidationResult result = validator.Validate(instance);
//If not valid, set errors on web message
if (!result.IsValid)
{
webMessage.Success = false;
webMessage.Errors = result.GetErrorsAsCollection();
}
return result.IsValid;
}
}
}
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