Created
April 27, 2021 06:43
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Verify a recaptcha v3 token.
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| <?php | |
| function verify_captcha($token) { | |
| $threshold = 0.5; // Score must be > threshold to pass captcha. | |
| // Default is 0.5, although the majority of users will get 0.9 | |
| $sites = ["localhost", "nachotoast.com", "ntgc.ddns.net"]; // Site names string, e.g. sub.domain.com:8080 | |
| $secret = "Put your client secret here."; | |
| $url = "https://www.google.com/recaptcha/api/siteverify"; | |
| $data = array("secret" => $secret, "response" => $token); | |
| $options = array( | |
| "http" => array( | |
| "header" => "Content-type: application/x-www-form-urlencoded\r\n", | |
| "method" => "POST", | |
| "content" => http_build_query($data) | |
| ) | |
| ); | |
| $context = stream_context_create($options); | |
| $response = file_get_contents($url, false, $context); | |
| $response_keys = json_decode($response, true); | |
| // error checks | |
| if (isset($response_keys["error-codes"])) { | |
| if (in_array("timeout-or-duplicate", $response_keys["error-codes"])) return "expired"; | |
| return $response_keys["error-codes"]; | |
| } | |
| // success check (theoretically not needed due to above error checks) | |
| if ($response_keys["success"] !== true) return "invalid-token"; | |
| // score check | |
| if ($response_keys["score"] < $threshold) return "failed"; | |
| // hostname check | |
| if (!in_array($response_keys["hostname"], $sites)) return "wrong-site"; | |
| // action check | |
| if ($response_keys["action"] !== "submit") return "wrong-action"; | |
| return true; | |
| } |
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