gistfile1.txt

using System.ComponentModel.DataAnnotations;
using System.Web;

using Orchard;

using Patient.Framework.AntiSpam.Services;

namespace Patient.Framework.AntiSpam.Attributes {

    public class RecaptchaAttribute : ValidationAttribute {
        private string _secret;

        public RecaptchaAttribute(string Secret) {
            ErrorMessage = "reCAPTCHA validation failed. Please ensure you are not a robot.";
            _secret = Secret;
        }

        public override bool IsValid(object value) {
            var requestContext = HttpContext.Current.Request.RequestContext;
            var workContext = requestContext.GetWorkContext();
            var recaptchaService = workContext.Resolve<IRecaptchaService>();

            var response = requestContext.HttpContext.Request.Form["g-recaptcha-response"];
            var recaptchaVerificationStatus = recaptchaService.IsValid(_secret, response, requestContext.HttpContext.Request.UserHostAddress);

            if (!recaptchaVerificationStatus.IsValid && !string.IsNullOrEmpty(recaptchaVerificationStatus.ErrorMessage)) {
                ErrorMessage = recaptchaVerificationStatus.ErrorMessage;
            }

            return recaptchaVerificationStatus.IsValid;
        }
    }
}