在Asp.net Core中使用Swagger进行流利验证 [英] Fluent Validation with Swagger in Asp.net Core

问题描述

我目前在Web API中使用的是Fluent Validation而不是Data Annotations，并且使用swagger编写API文档.流利的验证规则未反映在swagger模型中，因为我无法使用swagger架构过滤器配置流利的验证规则.

I am currently using Fluent Validation instead of Data Annotations for my Web api and using swagger for API documentation. Fluent validation rules are not reflected in swagger model as i am unable to configure fluent validation rules with swagger schema filter.

此博客有一个与ASP.net MVC一起使用的很好解释.但是我无法对其进行配置以在ASP.net Core中使用它.

This Blog has a good explanation for using it with ASP.net MVC. but i am unable to configure it to use it in ASP.net Core.

到目前为止，我已经尝试了以下代码，但无法获得验证器类型.

So far i have tried the following code but i am unable to get validator type.

services.AddSwaggerGen(options => options.SchemaFilter<AddFluentValidationRules>());

public class AddFluentValidationRules : ISchemaFilter
{
    public void Apply(Schema model, SchemaFilterContext context)
    {
        model.Required = new List<string>();
        var validator = GetValidator(type); // How?
        var validatorDescriptor = validator.CreateDescriptor();

        foreach (var key in model.Properties.Keys)
        {
            foreach (var propertyValidator in validatorDescriptor.GetValidatorsForMember(key))
            {
                 // Add to model properties as in blog
            }
        }
    }
}

推荐答案

搜索后，我终于发现我需要IValidationFactory作为验证器实例.

After searching i have finally figured out that i needed to IValidationFactory for validator instance.

public class AddFluentValidationRules : ISchemaFilter
{
    private readonly IValidatorFactory _factory;

    /// <summary>
    ///     Default constructor with DI
    /// </summary>
    /// <param name="factory"></param>
    public AddFluentValidationRules(IValidatorFactory factory)
    {
        _factory = factory;
    }

    /// <summary>
    /// </summary>
    /// <param name="model"></param>
    /// <param name="context"></param>
    public void Apply(Schema model, SchemaFilterContext context)
    {

        // use IoC or FluentValidatorFactory to get AbstractValidator<T> instance
        var validator = _factory.GetValidator(context.SystemType);
        if (validator == null) return;
        if (model.Required == null)
            model.Required = new List<string>();

        var validatorDescriptor = validator.CreateDescriptor();
        foreach (var key in model.Properties.Keys)
        {
            foreach (var propertyValidator in validatorDescriptor
                .GetValidatorsForMember(ToPascalCase(key)))
            {
                if (propertyValidator is NotNullValidator 
                  || propertyValidator is NotEmptyValidator)
                    model.Required.Add(key);

                if (propertyValidator is LengthValidator lengthValidator)
                {
                    if (lengthValidator.Max > 0)
                        model.Properties[key].MaxLength = lengthValidator.Max;

                    model.Properties[key].MinLength = lengthValidator.Min;
                }

                if (propertyValidator is RegularExpressionValidator expressionValidator)
                    model.Properties[key].Pattern = expressionValidator.Expression;

                // Add more validation properties here;
            }
        }
    }

    /// <summary>
    ///     To convert case as swagger may be using lower camel case
    /// </summary>
    /// <param name="inputString"></param>
    /// <returns></returns>
    private static string ToPascalCase(string inputString)
    {
        // If there are 0 or 1 characters, just return the string.
        if (inputString == null) return null;
        if (inputString.Length < 2) return inputString.ToUpper();
        return inputString.Substring(0, 1).ToUpper() + inputString.Substring(1);
    }
}

并将此类添加到swaggerGen选项

and add this class to swaggerGen options

options.SchemaFilter<AddFluentValidationRules>();

这篇关于在Asp.net Core中使用Swagger进行流利验证的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！