Submit Button Sends Email Even If ReCaptcha Has Been Done

Im in the process of adding the reCaptcha from google to my form. The problem is that even though I have followed the instructions from google. I can still press the Submit button

Solution 1:

So we set up the form and make sure your library is included, I prevent the submit button from being clicked while the recaptcha has not been completed and show a tooltip to notify the user it is needed to continue. Then enable it when it has been complete using the callback methods.

login.php

<div class="formContainer">
    <script src='https://www.google.com/recaptcha/api.js'></script>
    <form action="loginHandler.php" method="post" name="login_form" id="loginForm" class="loginForm">  
        <h2>Login</h2>
        <p><input type="text" required placeholder="Email" name="email"></p>
        <p><input type="password" required placeholder="Password" name="password" id="password"></p>
        <div class="g-recaptcha" data-callback="captcha_filled"
                 data-expired-callback="captcha_expired" 
                 data-sitekey="XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX">
        </div>
        <div>
            <p class="show-tt" data-toggle="tooltip" title="Complete the reCAPTCHA to login." data-placement="bottom">
                <input id="submitLogin" type="submit" value="Login">
            </p>
        </div>
    </form>
</div>

<script>
    //prevent submit and show tooltip until captch is complete.
    var submit = false;
    $("#submitLogin").prop('disabled', true);

    function captcha_filled() {
        submit = true;
        $("#submitLogin").prop('disabled', false);
        $(".show-tt").tooltip('destroy');
    }
    function captcha_expired() {
        submit = false;
        $("#submitLogin").prop('disabled', true);
        showTooltip();
    }
    function showTooltip () {
        $(".show-tt").tooltip('show');
    }
</script>

Now we post to loginHandler.php, or wherever your form submits too and then there we will assign your secret key and then verify the request with google.

loginHandler.php

$secret = "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXX";

if (isset($_POST["g-recaptcha-response"])) {

    $url = 'https://www.google.com/recaptcha/api/siteverify?secret=' . urlencode($secret) .
            '&response=' . urlencode($_POST['g-recaptcha-response']) . '&remoteip=' . urlencode($_SERVER['REMOTE_ADDR']);
    //ip address is optional
    $result = json_decode(file_get_contents($url), true);

    if ($result != null && $result['success'] === true) {

        //success, handle login/submit data or whatever

    } else {
        //response is bad, handle the error
        header('Location: login.php?error=4');
    }
} else {
    //captcha response is not set, handle error
    header('Location: login.php?error=5');
}