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reCAPTCHA v3 for Craft CMS 3

A simple craft plugin for validating Google's reCAPTCHA v3

Documentation

Installation

To install the plugin, follow these instructions.

  1. Open your terminal and tell composer to require the plugin composer require codewithkyle/recaptcha
  2. In the Control Panel, go to Settings -> Plugins and click the “Install” button for Recaptcha.

Configuring

Go to Settings -> Plugins -> reCAPTCHA for Craft -> Settings. Paste your site and secret keys for Google reCAPTCHA v3.

Using recaptcha

  1. Build your form element eg: form
  2. Add your site key to the <form> element with data-key="{{ craft.recaptcha.getPublicKey() }}"
  3. In JavaScript we need the following variables:
  • form = document.body.querySelector('form');
  • var key = form.getAttribute('data-key');
  1. Get Googles reCAPTCHA API with <script src="https://www.google.com/recaptcha/api.js?render={{ craft.recaptcha.getPublicKey }}"></script>
  1. Execute grecaptcha.execute whenever users submit the form sample code
  2. Based on the response do what you need to do

Verification Response Object

When verifying a token the server will respond with a verification JSON object. When parsed it will appear like:

Object{
  action: "type",
  score: 0.9,
  status: 200,
  timestamp: "2018-08-03T19:48:00Z"
}

Google's Documentation on Using Score

reCAPTCHA v3 returns a score (1.0 is very likely a good interaction, 0.0 is very likely a bot). Based on the score, you can take variable action in the context of your site.

Google's Documentation on Using Actions

reCAPTCHA v3 introduces a new concept: actions. When you specify an action name in each place you execute reCAPTCHA you enable two new features:

  • a detailed break-down of data for your top ten actions in the admin console
  • adaptive risk analysis based on the context of the action (abusive behavior can vary) Importantly, when you verify the reCAPTCHA response you should also verify that the action name matches the one you expect.