CODEWITHSUNDEEP
c#asp.net-web-apiasp.net-web-api2fluentvalidation
thegautamnayak
thegautamnayak

Reputation: 307

Fluent Validation for Webapi Single parameter

I am using webapi2 and Fluent validation for validating the request. I am having the below method.

public IHttpActionResult Post(string id)
{}

I want to add validation to id such as regex validation and length validation. Is there any way where i can use a custom validator attribute having same syntax as [FromQuery]?

Upvotes: 0

Views: 1089

Answers (1)

thegautamnayak
thegautamnayak

Reputation: 307

I have created a custom paramter binding attribute to do the validation.

public class ValidateItemAttribute : ParameterBindingAttribute
{
        public override HttpParameterBinding GetBinding(HttpParameterDescriptor parameter) => new ItemIdValidation(parameter);
}

  public class ItemIdValidation : HttpParameterBinding, IValueProviderParameterBinding
    {
        public HttpParameterBinding DefaultUriBinding;
        public IEnumerable<ValueProviderFactory> ValueProviderFactories { get; }
        public ItemIdValidation(HttpParameterDescriptor desc) : base(desc)
        {
            var defaultUrl = new FromUriAttribute();
            this.DefaultUriBinding = defaultUrl.GetBinding(desc);
            this.ValueProviderFactories = defaultUrl.GetValueProviderFactories(desc.Configuration);
        }


        public override Task ExecuteBindingAsync(ModelMetadataProvider metadataProvider, HttpActionContext actionContext, CancellationToken cancellationToken)
        {
            return DefaultUriBinding.ExecuteBindingAsync(metadataProvider, actionContext, cancellationToken).ContinueWith((tsk) =>
            {
                var currentBoundValue = this.GetValue(actionContext)?.ToString();
                var isMatched = currentBoundValue != null ? Regex.IsMatch(currentBoundValue, "^[0-9]*$") : false;
                if (null != currentBoundValue && (!isMatched || currentBoundValue?.Length != 6))
                {
                    var result = new
                    {
                        ErrorCode ="1",
                        ErrorDescription = "Invalid item id"
                    };
                    actionContext.Response = actionContext.Request.CreateResponse(HttpStatusCode.BadRequest, result, "application/json");
                }
            }, cancellationToken);
        }
    }

Upvotes: 1

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