config = $config;
}
public function isEnabled(): bool
{
return !empty($this->config['site_key']) && !empty($this->config['secret_key']);
}
public function render(array $context = []): string
{
if (!$this->isEnabled()) {
return '';
}
$labels = $context['labels'] ?? [];
$label = $labels['image'] ?? $labels['code'] ?? 'Security Check';
$theme = $this->config['theme'] ?? 'light';
$size = $this->config['size'] ?? 'normal';
$validSizes = ['compact', 'normal'];
if (!in_array($size, $validSizes, true)) {
$size = 'normal';
}
$attributes = sprintf(
'class="g-recaptcha" data-sitekey="%s" data-theme="%s" data-size="%s"',
htmlspecialchars($this->config['site_key'], ENT_QUOTES, 'UTF-8'),
htmlspecialchars($theme, ENT_QUOTES, 'UTF-8'),
htmlspecialchars($size, ENT_QUOTES, 'UTF-8')
);
return sprintf(
'| %s | %s |
',
htmlspecialchars($label, ENT_QUOTES, 'UTF-8'),
$attributes,
''
);
}
public function verify(array $payload, array $context = []): bool
{
$token = trim((string) ($payload['request']['g-recaptcha-response'] ?? ''));
if ($token === '') {
throw new CaptchaValidationException('Captcha verification token is missing.');
}
$secret = $this->config['secret_key'] ?? '';
if ($secret === '') {
throw new CaptchaValidationException('Captcha secret key is not configured.');
}
$data = [
'secret' => $secret,
'response' => $token,
];
$remoteIp = $context['ip'] ?? null;
if (!empty($remoteIp)) {
$data['remoteip'] = $remoteIp;
}
$result = $this->sendVerificationRequest('https://www.recaptcha.net/recaptcha/api/siteverify', $data);
if (!($result['success'] ?? false)) {
throw new CaptchaValidationException('Captcha verification failed.');
}
return true;
}
protected function sendVerificationRequest(string $url, array $data): array
{
$payload = http_build_query($data);
if (function_exists('curl_init')) {
$ch = curl_init($url);
curl_setopt_array($ch, [
CURLOPT_RETURNTRANSFER => true,
CURLOPT_POST => true,
CURLOPT_POSTFIELDS => $payload,
CURLOPT_TIMEOUT => 10,
CURLOPT_SSL_VERIFYPEER => true,
]);
$response = curl_exec($ch);
if ($response === false) {
$error = curl_error($ch);
curl_close($ch);
throw new CaptchaValidationException('Captcha verification request failed: ' . $error);
}
curl_close($ch);
} else {
$context = stream_context_create([
'http' => [
'method' => 'POST',
'header' => "Content-type: application/x-www-form-urlencoded\r\n",
'content' => $payload,
'timeout' => 10,
],
]);
$response = file_get_contents($url, false, $context);
if ($response === false) {
throw new CaptchaValidationException('Captcha verification request failed.');
}
}
$decoded = json_decode($response, true);
if (!is_array($decoded)) {
throw new CaptchaValidationException('Unexpected captcha verification response.');
}
return $decoded;
}
}