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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace App\Domain\Contact\Service; |
| 6 | |
| 7 | use Psr\Log\LoggerInterface; |
| 8 | |
| 9 | use function curl_close; |
| 10 | use function curl_error; |
| 11 | use function curl_exec; |
| 12 | use function curl_getinfo; |
| 13 | use function curl_init; |
| 14 | use function curl_setopt_array; |
| 15 | use function http_build_query; |
| 16 | use function is_array; |
| 17 | use function is_string; |
| 18 | use function json_decode; |
| 19 | |
| 20 | /** |
| 21 | * cURL-backed Cloudflare Turnstile verifier. POSTs the token to the |
| 22 | * siteverify endpoint and reports whether the challenge passed. |
| 23 | * |
| 24 | * Fails closed: any transport error, malformed response, or unset secret |
| 25 | * returns false, so a misconfiguration or a Cloudflare outage blocks the |
| 26 | * submission rather than letting spam through. Legitimate users can retry |
| 27 | * or use the email fallback shown on the form. |
| 28 | */ |
| 29 | final readonly class CloudflareTurnstileVerifier implements TurnstileVerifierInterface |
| 30 | { |
| 31 | private const string SITEVERIFY_URL = 'https://challenges.cloudflare.com/turnstile/v0/siteverify'; |
| 32 | private const int TIMEOUT_SECONDS = 5; |
| 33 | |
| 34 | public function __construct( |
| 35 | private string $secretKey, |
| 36 | private LoggerInterface $logger, |
| 37 | ) {} |
| 38 | |
| 39 | public function verify(string $token, ?string $remoteIp = null): bool |
| 40 | { |
| 41 | if ($this->secretKey === '') { |
| 42 | $this->logger->error('Turnstile secret_key is not configured; rejecting submission'); |
| 43 | return false; |
| 44 | } |
| 45 | if ($token === '') { |
| 46 | return false; |
| 47 | } |
| 48 | |
| 49 | $fields = ['secret' => $this->secretKey, 'response' => $token]; |
| 50 | if ($remoteIp !== null && $remoteIp !== '') { |
| 51 | $fields['remoteip'] = $remoteIp; |
| 52 | } |
| 53 | |
| 54 | $ch = curl_init(self::SITEVERIFY_URL); |
| 55 | if ($ch === false) { |
| 56 | $this->logger->error('Failed to initialise cURL handle for Turnstile verification'); |
| 57 | return false; |
| 58 | } |
| 59 | |
| 60 | curl_setopt_array($ch, [ |
| 61 | CURLOPT_POST => true, |
| 62 | CURLOPT_POSTFIELDS => http_build_query($fields), |
| 63 | CURLOPT_RETURNTRANSFER => true, |
| 64 | CURLOPT_TIMEOUT => self::TIMEOUT_SECONDS, |
| 65 | CURLOPT_CONNECTTIMEOUT => self::TIMEOUT_SECONDS, |
| 66 | CURLOPT_SSL_VERIFYPEER => true, |
| 67 | CURLOPT_SSL_VERIFYHOST => 2, |
| 68 | ]); |
| 69 | |
| 70 | $response = curl_exec($ch); |
| 71 | $statusCode = (int)curl_getinfo($ch, CURLINFO_HTTP_CODE); |
| 72 | $error = curl_error($ch); |
| 73 | curl_close($ch); |
| 74 | |
| 75 | if (!is_string($response) || $error !== '' || $statusCode < 200 || $statusCode >= 300) { |
| 76 | $this->logger->error('Turnstile verification transport error', [ |
| 77 | 'status' => $statusCode, |
| 78 | 'error' => $error !== '' ? $error : 'unknown', |
| 79 | ]); |
| 80 | return false; |
| 81 | } |
| 82 | |
| 83 | $decoded = json_decode($response, true); |
| 84 | if (!is_array($decoded)) { |
| 85 | $this->logger->error('Turnstile verification returned a non-JSON response'); |
| 86 | return false; |
| 87 | } |
| 88 | |
| 89 | $success = ($decoded['success'] ?? false) === true; |
| 90 | if (!$success) { |
| 91 | $this->logger->warning('Turnstile challenge failed', [ |
| 92 | 'error-codes' => $decoded['error-codes'] ?? [], |
| 93 | ]); |
| 94 | } |
| 95 | |
| 96 | return $success; |
| 97 | } |
| 98 | } |