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<?php
// captcha.php

// Your reCAPTCHA keys and project info
$project_id = 'my-project-1014-1682620065870';
$site_key   = '6LeTl-QrAAAAAN5xWX6VQwcqfh9UUhoADuSSr0e0';
$api_key    = '6LeTl-QrAAAAAEZkBM-uM8tdsMnZ11NhjQ-YKZuj';

// Get the token from POST
$token = $_POST['g-recaptcha-response'] ?? '';

if (empty($token)) {
    throw new \Exception('Captcha verification failed: no token received.');
}

// Send the token to Google for verification
$url = "https://recaptchaenterprise.googleapis.com/v1/projects/$project_id/assessments?key=$api_key";

$data = [
    'event' => [
        'token' => $token,
        'siteKey' => $site_key,
        'expectedAction' => 'submit', 
    ],
];

$options = [
    'http' => [
        'header'  => "Content-type: application/json\r\n",
        'method'  => 'POST',
        'content' => json_encode($data),
        'timeout' => 10,
    ],
];

$context = stream_context_create($options);
$response = @file_get_contents($url, false, $context);

if ($response === false) {
    throw new \Exception('Captcha verification request failed.');
}

$result = json_decode($response, true);

// Validate the response
if (!isset($result['tokenProperties']['valid']) || !$result['tokenProperties']['valid']) {
    $reason = $result['tokenProperties']['invalidReason'] ?? 'unknown';
    throw new \Exception("Captcha token invalid: $reason");
}

if ($result['tokenProperties']['action'] !== 'submit') {
    throw new \Exception('Captcha action mismatch.');
}

$score = $result['riskAnalysis']['score'] ?? 0.0;

// Fail if the score is too low
if ($score < 0.8) {
    throw new \Exception('Please prove you are not a robot.');
}

// If we reach here, captcha passed
return true;
?>