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<?php |
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/** |
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* Copyright (c) 2019. Volodymyr Hryvinskyi. All rights reserved. |
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* @author: <mailto:[email protected]> |
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* @github: <https://github.com/hryvinskyi> |
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*/ |
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declare(strict_types=1); |
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namespace Hryvinskyi\InvisibleCaptcha\Model\ReCaptcha; |
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use Exception; |
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use Hryvinskyi\Base\Helper\Json; |
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/** |
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* Class VerifyVerifyReCaptcha |
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*/ |
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class VerifyReCaptcha |
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{ |
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/** |
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* URL for reCAPTCHA sitevrerify API |
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* |
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* @const string |
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*/ |
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const SITE_VERIFY_URL = 'https://www.google.com/recaptcha/api/siteverify'; |
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/** |
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* Invalid JSON received |
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* |
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* @const string |
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*/ |
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const E_INVALID_JSON = 'invalid-json'; |
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/** |
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* Could not connect to service |
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* |
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* @const string |
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*/ |
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const E_CONNECTION_FAILED = 'connection-failed'; |
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/** |
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* Did not receive a 200 from the service |
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* |
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* @const string |
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*/ |
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const E_BAD_RESPONSE = 'bad-response'; |
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/** |
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* Not a success, but no error codes received! |
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* |
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* @const string |
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*/ |
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const E_UNKNOWN_ERROR = 'unknown-error'; |
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/** |
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* ReCAPTCHA response not provided |
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* |
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* @const string |
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*/ |
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const E_MISSING_INPUT_RESPONSE = 'missing-input-response'; |
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/** |
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* Expected hostname did not match |
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* |
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* @const string |
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*/ |
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const E_HOSTNAME_MISMATCH = 'hostname-mismatch'; |
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/** |
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* Expected action did not match |
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* |
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* @const string |
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*/ |
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const E_ACTION_MISMATCH = 'action-mismatch'; |
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/** |
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* Score threshold not met |
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* |
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* @const string |
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*/ |
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const E_SCORE_THRESHOLD_NOT_MET = 'score-threshold-not-met'; |
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/** |
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* Challenge timeout |
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* |
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* @const string |
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*/ |
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const E_CHALLENGE_TIMEOUT = 'challenge-timeout'; |
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/** |
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* @var string |
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*/ |
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private $hostname; |
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/** |
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* @var string |
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*/ |
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private $action; |
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/** |
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* @var float |
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*/ |
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private $threshold; |
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/** |
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* @var int |
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*/ |
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private $timeoutSeconds; |
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/** |
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* Shared secret for the site. |
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* @var string |
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*/ |
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private $secret; |
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/** |
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* Method used to communicate with service. Defaults to POST request. |
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* |
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* @var RequestMethodInterface |
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*/ |
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private $requestMethod; |
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/** |
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* @var RequestParameters |
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*/ |
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private $requestParameters; |
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/** |
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* VerifyReCaptcha constructor. |
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* |
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* @param RequestMethodInterface $requestMethod |
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* @param RequestParameters $requestParameters |
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*/ |
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public function __construct( |
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RequestMethodInterface $requestMethod, |
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RequestParameters $requestParameters |
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) { |
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$this->requestMethod = $requestMethod; |
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$this->requestParameters = $requestParameters; |
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} |
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/** |
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* Calls the reCAPTCHA siteverify API to verify whether the user passes |
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* CAPTCHA test and additionally runs any specified additional checks |
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* |
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* @param string $response The user response token provided by reCAPTCHA, verifying the user on your site. |
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* @param string $remoteIp The end user's IP address. |
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* |
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* @return Response |
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*/ |
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public function verify($response, $remoteIp = null): Response |
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{ |
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$params = $this->requestParameters |
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->setSecret($this->getSecret()) |
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->setResponse($response) |
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->setRemoteIp($remoteIp); |
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$answer = $this->requestMethod->submit(self::SITE_VERIFY_URL, $params); |
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$initialResponse = Response::fromJson($answer); |
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$validationErrors = []; |
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if ( |
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isset($this->hostname) |
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&& $initialResponse->getHostname() |
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&& strcasecmp($this->hostname, $initialResponse->getHostname()) !== 0 |
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) { |
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$validationErrors[] = self::E_HOSTNAME_MISMATCH; |
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} |
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if ( |
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isset($this->action) |
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&& $initialResponse->getAction() |
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&& strcasecmp($this->action, $initialResponse->getAction()) !== 0 |
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) { |
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$validationErrors[] = self::E_ACTION_MISMATCH; |
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} |
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if ( |
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isset($this->threshold) |
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&& $initialResponse->getScore() |
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&& $this->threshold > $initialResponse->getScore() |
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) { |
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$validationErrors[] = self::E_SCORE_THRESHOLD_NOT_MET; |
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} |
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if (isset($this->timeoutSeconds) && $initialResponse->getChallengeTs()) { |
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$challengeTs = strtotime($initialResponse->getChallengeTs()); |
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if ($challengeTs > 0 && time() - $challengeTs > $this->timeoutSeconds) { |
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$validationErrors[] = self::E_CHALLENGE_TIMEOUT; |
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} |
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} |
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if (empty($validationErrors)) { |
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return $initialResponse; |
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} |
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return new Response( |
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false, |
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array_merge($initialResponse->getErrorCodes(), $validationErrors), |
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$initialResponse->getHostname(), |
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$initialResponse->getChallengeTs(), |
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$initialResponse->getScore(), |
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$initialResponse->getAction() |
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); |
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} |
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/** |
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* @return string |
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*/ |
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public function getSecret(): string |
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{ |
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return $this->secret; |
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} |
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/** |
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* @param string $secret |
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* |
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* @return VerifyReCaptcha |
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*/ |
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public function setSecret(string $secret): VerifyReCaptcha |
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{ |
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$this->secret = $secret; |
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return $this; |
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} |
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/** |
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* Provide a hostname to match against in verify() |
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* This should be without a protocol or trailing slash, e.g. www.google.com |
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* |
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* @param string $hostname Expected hostname |
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* |
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* @return VerifyReCaptcha |
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*/ |
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public function setExpectedHostname($hostname): VerifyReCaptcha |
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{ |
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$this->hostname = $hostname; |
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return $this; |
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} |
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/** |
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* Provide an action to match against in verify() |
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* This should be set per page. |
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* |
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* @param string $action Expected action |
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* |
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* @return VerifyReCaptcha |
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*/ |
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public function setExpectedAction($action): VerifyReCaptcha |
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{ |
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$this->action = $action; |
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return $this; |
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} |
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/** |
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* Provide a threshold to meet or exceed in verify() |
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* Threshold should be a float between 0 and 1 which will be tested as response >= threshold. |
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* |
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* @param float $threshold Expected threshold |
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* |
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* @return VerifyReCaptcha |
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*/ |
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public function setScoreThreshold($threshold): VerifyReCaptcha |
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{ |
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$this->threshold = floatval($threshold); |
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return $this; |
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} |
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/** |
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* Provide a timeout in seconds to test against the challenge timestamp in verify() |
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* |
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* @param int $timeoutSeconds Expected hostname |
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* |
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* @return VerifyReCaptcha |
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*/ |
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public function setChallengeTimeout(int $timeoutSeconds): VerifyReCaptcha |
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{ |
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$this->timeoutSeconds = $timeoutSeconds; |
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return $this; |
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} |
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} |
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