Created
February 17, 2018 12:48
-
-
Save MoienTajik/7e49cb1a8106b53ec220f760e545c750 to your computer and use it in GitHub Desktop.
Using Google reCAPTCHA in ASP.NET MVC - Validate reCAPTCHA Attribute
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| public class ValidateGoogleCaptchaAttribute : ActionFilterAttribute | |
| { | |
| public override void OnActionExecuting(ActionExecutingContext filterContext) | |
| { | |
| const string urlToPost = "https://www.google.com/recaptcha/api/siteverify"; | |
| const string secretKey = SiteSettings.GoogleRecaptchaSecretKey; | |
| var captchaResponse = filterContext.HttpContext.Request.Form["g-recaptcha-response"]; | |
| if (string.IsNullOrWhiteSpace(captchaResponse)) AddErrorAndRedirectToGetAction(filterContext); | |
| var validateResult = ValidateFromGoogle(urlToPost, secretKey, captchaResponse); | |
| if (!validateResult.Success) AddErrorAndRedirectToGetAction(filterContext); | |
| base.OnActionExecuting(filterContext); | |
| } | |
| private static void AddErrorAndRedirectToGetAction(ActionExecutingContext filterContext) | |
| { | |
| filterContext.Controller.TempData["InvalidCaptcha"] = "Invalid Captcha !"; | |
| filterContext.Result = new RedirectToRouteResult(filterContext.RouteData.Values); | |
| } | |
| private static ReCaptchaResponse ValidateFromGoogle(string urlToPost, string secretKey, string captchaResponse) | |
| { | |
| var postData = "secret=" + secretKey + "&response=" + captchaResponse; | |
| var request = (HttpWebRequest)WebRequest.Create(urlToPost); | |
| request.Method = "POST"; | |
| request.ContentLength = postData.Length; | |
| request.ContentType = "application/x-www-form-urlencoded"; | |
| using (var streamWriter = new StreamWriter(request.GetRequestStream())) | |
| streamWriter.Write(postData); | |
| string result; | |
| using (var response = (HttpWebResponse)request.GetResponse()) | |
| { | |
| using (var reader = new StreamReader(response.GetResponseStream())) | |
| result = reader.ReadToEnd(); | |
| } | |
| return JsonConvert.DeserializeObject<ReCaptchaResponse>(result); | |
| } | |
| } | |
| internal class ReCaptchaResponse | |
| { | |
| [JsonProperty("success")] | |
| public bool Success { get; set; } | |
| [JsonProperty("challenge_ts")] | |
| public string ValidatedDateTime { get; set; } | |
| [JsonProperty("hostname")] | |
| public string HostName { get; set; } | |
| [JsonProperty("error-codes")] | |
| public List<string> ErrorCodes { get; set; } | |
| } |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment