Library for Google's ReCaptcha v3 backend https://www.google.com/recaptcha
Target platform: .NET Core 3.1
When targeting 3.0 use package version 1.1.2
Task<bool> IsCaptchaPassedAsync(string token);
Task<JObject> GetCaptchaResultDataAsync(string token);
Install the package https://www.nuget.org/packages/GoogleReCaptcha.V3/ using nuget Update your appsetting.json config file
"googleReCaptcha:SiteKey": "_YOUR_SITE_KEY",
"googleReCaptcha:SecretKey": "YOUR_SECRET_KEY"
You can get your keys here: https://www.google.com/recaptcha/admin
Update your middleware
services.AddHttpClient<ICaptchaValidator, GoogleReCaptchaValidator>();
Update your Views
@inject Microsoft.Extensions.Configuration.IConfiguration Configuration
<form asp-action="FormPost">
<input type="hidden" name="captcha" id="captchaInput" value=""/>
...
</form>
@section Scripts
{
<script src="https://www.google.com/recaptcha/api.js?render=@Configuration["googleReCaptcha:SiteKey"]"></script>
<script>
grecaptcha.ready(function() {
grecaptcha.execute('@Configuration["googleReCaptcha:SiteKey"]', { action: 'contact' }).then(function (token) {
$("#captchaInput").val(token);
});
});
</script>
}
Update your controller
inject ICaptchaValidator
public class HomeController : Controller
{
private readonly ICaptchaValidator _captchaValidator;
public HomeController(ICaptchaValidator captchaValidator)
{
_captchaValidator = captchaValidator;
}
[HttpPost]
public async Task<IActionResult> FormPost(Model collection, string captcha){
if (!await _captchaValidator.IsCaptchaPassedAsync(captcha))
{
ModelState.AddModelError("captcha","Captcha validation failed");
}
if(ModelState.IsValid){
...
}
return View(collection)
}
You can use following method instead to get all response data
async Task<JObject> GetCaptchaResultDataAsync(string token)
Methods can throw 'HttpRequestException' when connection to the Google's service doesn't work or service doesn't response with HTTP 200
Contact me in case you find any errors or problem via email langerjara@gmail.com