reCaptcha in android xamarin

问题

I would like to implement captcha in Xamarin android app. I got hold of this integrate googles reCaptcha validation in Android. But its a native android project. I also found this, but I am unable to make it work. I am getting Failed to Check Compatibility alert. The API SafetyNetClass.SafetyNetApi.AttestAsync is returning an error. Not sure why.

Is there any other way to go about captcha validation. Any help would be appreciated.

回答1:

In order to use the SafetyNetApi to do reCaptcha validation you need to:

Set your minSdkVersion to 14 or higher
Make sure you include Google Repository in your SDK tools
Install Xamarin.GooglePlayServices.SafetyNet package
Sign your app package name in reCAPTCHA Android signup site and get your Site key and Secret key

After this you launch the verification of the captcha:

try
{
    var response = await SafetyNetClass.GetClient(this.context).VerifyWithRecaptchaAsync("YOUR_API_SITE_KEY");
    if (!string.IsNullOrEmpty(response.TokenResult))
    {
        // Validate the user response token using the
        // reCAPTCHA siteverify API.
    }
}
catch(Exception ex)
{
    // Handle exception
    throw ex;
}

After you get the token result not null, you need to verify it using the reCAPTCHA siteverify API. Here is where you need to use the Secret key.

Pay attention to error handling when communicating with the reCaptcha service. You can check more about this following the links below.

More Info:

https://developer.android.com/training/safetynet/recaptcha#validate-response
https://developers.google.com/recaptcha/docs/verify
http://android-er.blogspot.com/2017/06/example-using-safetynet-recaptcha-api.html (careful here because some of the methods used here are obsolete)

来源：https://stackoverflow.com/questions/52165506/recaptcha-in-android-xamarin

标签

android

xamarin.android

recaptcha