In this post I will explains how to enable and
customize the Invisible reCAPTCHA on your webpage and we can enable and
customize the Invisible reCAPTCHA in to two ways.
Google's
New Invisible reCAPTCHA in MVC Using Action Filters -
Step
1
- Go to URL https://www.google.com/recaptcha/admin
and login with your credentials
Step
2
- Register the reCAPTCHA for your site with your site Label.
Select your Invisible reCAPTCHA radio button.
After selecting Invisible reCAPTCHA, we will need to add your Domains mane
where you want to add this Invisible reCAPTCHA and click on register with terms
of services.
For example - My added domain is - localhost and
site Label is - test. You can see the above steps for the same.
Step
3
- Client side integration -
Add Script Bundle in the Bundle
bundles.Add(new ScriptBundle("~/bundles/recaptcha",
"//www.google.com/recaptcha/api.js").Include("~/Scripts/recaptcha-api.js"));
HTML
page-
@model LoginViewModel
@using (Html.BeginForm("Login",
"Account", new
{ ReturnUrl = ViewBag.ReturnUrl }, FormMethod.Post,
new { @class = "", role = "form",
id = "LoginForm" }))
{
<div class="form-group" id="loginSection">
@Html.AntiForgeryToken()
@Html.ValidationSummary(true,
"", new
{ @class = "text-danger" })
@Html.TextBoxFor(m => m.Email, new
{ @class = "form-control", placeholder = "Email",
id = "txtEmail", autofocus = "autofocus"
})
@Html.ValidationMessageFor(m => m.Email, "",
new { @class = "text-danger" })
</div>
<div class="clr_10"></div>
<button class="g-recaptcha
btn btn-default"
data-sitekey="@Model.RecaptchaPublicKey"
data-callback="OnSubmit">
Generate Pass Code
</button>
}
And Load
JavaScript API
@section Scripts {
@Scripts.Render("~/bundles/jqueryval")
@Scripts.Render("~/bundles/recaptcha")
<script>
function
OnSubmit(token) {
document.getElementById("LoginForm").submit();
}
</script>
}
AND
public class LoginViewModel
{
[Required]
[Display(Name
= "Email")]
[EmailAddress]
public string
Email { get; set; }
//[Required]
[DataType(DataType.Password)]
[Display(Name
= "Password")]
public string
Password { get; set; }
[Display(Name
= "Remember me?")]
public bool
RememberMe { get; set; }
public string
RecaptchaPublicKey { get; }
public
LoginViewModel() { }
public
LoginViewModel(string recaptchaPublicKey)
{
RecaptchaPublicKey =
recaptchaPublicKey;
}
}
Step
4
- Install Autofac and Autofac.MVC5 using Nuget package manager in the portal
app.
Step
5
- Create Invisible reCAPTCHA Validation Service
Interface
-
public interface ICaptchaValidationService
{
bool
Validate(string response);
}
Interface
implementation -
public class InvisibleRecaptchaValidationService
: ICaptchaValidationService
{
private const string
API_URL = "https://www.google.com/recaptcha/api/siteverify";
private readonly string
_secretKey;
public
InvisibleRecaptchaValidationService(string
secretKey)
{
_secretKey = secretKey;
}
public bool
Validate(string response)
{
if
(!string.IsNullOrWhiteSpace(response))
{
using
(var client = new WebClient())
{
var
result = client.DownloadString($"{API_URL}?secret={_secretKey}&response={response}");
return
ParseValidationResult(result);
}
}
return false;
}
private bool
ParseValidationResult(string validationResult) => (bool)JObject.Parse(validationResult).SelectToken("success");
}
Step 6 - Create Validate reCAPTCHA on the Server
using this custom Attribute
public class ValidateRecaptchaAttribute
: ActionFilterAttribute
{
private const string
RECAPTCHA_RESPONSE_KEY = "g-recaptcha-response";
public ICaptchaValidationService
CaptchaService { get; set; }
public override void
OnActionExecuting(ActionExecutingContext filterContext)
{
var
isValidate = new InvisibleRecaptchaValidationService(ConfigurationManager.AppSettings["RecaptchaSecretKey"]).Validate(filterContext.HttpContext.Request[RECAPTCHA_RESPONSE_KEY]);
if
(!isValidate)
filterContext.Controller.ViewData.ModelState.AddModelError("Recaptcha",
"Captcha validation failed.");
}
}
Step
7 -
//GET: /Account/Login
[AllowAnonymous]
public ActionResult
Login(string returnUrl)
{
if
(System.Web.HttpContext.Current.User.Identity.IsAuthenticated)
{
return
RedirectToAction("Index", "Home");
}
return
View(new LoginViewModel(ConfigurationManager.AppSettings["RecaptchaPublicKey"]));
}
Step
8 -
//POST: /Account/Login
[HttpPost]
[AllowAnonymous]
[ValidateRecaptcha]
public ActionResult
Login(LoginViewModel model, string returnUrl)
{
if
(ModelState.IsValid)
{
}
return
View("Login");
}
Step
9 - Add the below code in the config file.
<add key="RecaptchaSecretKey" value="6Lcf****AAAEJN**EPRU***"
/>
<add key="RecaptchaPublicKey" value="****b27MgXmNmu2****OocE" />
AND
<dependentAssembly>
<assemblyIdentity name="Autofac" publicKeyToken="17863af14b0044da" culture="neutral"
/>
<bindingRedirect oldVersion="0.0.0.0-4.6.1.0" newVersion="4.6.1.0"
/>
</dependentAssembly>
</assemblyBinding>
Live
Results –
References
-
I hope you are enjoying with this post!
Please share with you friends. Thank you so much!
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Anil Singh is an author, tech blogger, and software programmer. Book writing, tech blogging is something do extra and Anil love doing it. For more detail, kindly refer to this link..
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