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- <?php
- define("RECAPTCHA_API_SERVER", "http://api.recaptcha.net");
- define("RECAPTCHA_API_SECURE_SERVER", "https://api-secure.recaptcha.net");
- define("RECAPTCHA_VERIFY_SERVER", "api-verify.recaptcha.net");
- function _recaptcha_qsencode ($data) {
- $req = "";
- foreach ( $data as $key => $value )
- $req .= $key . '=' . urlencode( stripslashes($value) ) . '&';
-
- $req=substr($req,0,strlen($req)-1);
- return $req;
- }
- function _recaptcha_http_post($host, $path, $data, $port = 80) {
- $req = _recaptcha_qsencode ($data);
- $http_request = "POST $path HTTP/1.0\r\n";
- $http_request .= "Host: $host\r\n";
- $http_request .= "Content-Type: application/x-www-form-urlencoded;\r\n";
- $http_request .= "Content-Length: " . strlen($req) . "\r\n";
- $http_request .= "User-Agent: reCAPTCHA/PHP\r\n";
- $http_request .= "\r\n";
- $http_request .= $req;
- $response = '';
- if( false == ( $fs = @fsockopen($host, $port, $errno, $errstr, 10) ) ) {
- die ('Could not open socket');
- }
- fwrite($fs, $http_request);
- while ( !feof($fs) )
- $response .= fgets($fs, 1160);
- fclose($fs);
- $response = explode("\r\n\r\n", $response, 2);
- return $response;
- }
- function recaptcha_get_html ($pubkey, $error = null, $use_ssl = false)
- {
- if ($pubkey == null || $pubkey == '') {
- die ("To use reCAPTCHA you must get an API key from <a href='http://recaptcha.net/api/getkey'>http://recaptcha.net/api/getkey</a>");
- }
-
- if ($use_ssl) {
- $server = RECAPTCHA_API_SECURE_SERVER;
- } else {
- $server = RECAPTCHA_API_SERVER;
- }
- $errorpart = "";
- if ($error) {
- $errorpart = "&error=" . $error;
- }
- return '<script type="text/javascript" src="'. $server . '/challenge?k=' . $pubkey . $errorpart . '"></script>
- <noscript>
- <iframe src="'. $server . '/noscript?k=' . $pubkey . $errorpart . '" height="300" width="500" frameborder="0"></iframe><br/>
- <textarea name="recaptcha_challenge_field" rows="3" cols="40"></textarea>
- <input type="hidden" name="recaptcha_response_field" value="manual_challenge"/>
- </noscript>';
- }
- class ReCaptchaResponse {
- var $is_valid;
- var $error;
- }
- function recaptcha_check_answer ($privkey, $remoteip, $challenge, $response, $extra_params = array())
- {
- if ($privkey == null || $privkey == '') {
- die ("To use reCAPTCHA you must get an API key from <a href='http://recaptcha.net/api/getkey'>http://recaptcha.net/api/getkey</a>");
- }
- if ($remoteip == null || $remoteip == '') {
- die ("For security reasons, you must pass the remote ip to reCAPTCHA");
- }
-
-
-
- if ($challenge == null || strlen($challenge) == 0 || $response == null || strlen($response) == 0) {
- $recaptcha_response = new ReCaptchaResponse();
- $recaptcha_response->is_valid = false;
- $recaptcha_response->error = 'incorrect-captcha-sol';
- return $recaptcha_response;
- }
- $response = _recaptcha_http_post (RECAPTCHA_VERIFY_SERVER, "/verify",
- array (
- 'privatekey' => $privkey,
- 'remoteip' => $remoteip,
- 'challenge' => $challenge,
- 'response' => $response
- ) + $extra_params
- );
- $answers = explode ("\n", $response [1]);
- $recaptcha_response = new ReCaptchaResponse();
- if (trim ($answers [0]) == 'true') {
- $recaptcha_response->is_valid = true;
- }
- else {
- $recaptcha_response->is_valid = false;
- $recaptcha_response->error = $answers [1];
- }
- return $recaptcha_response;
- }
- function recaptcha_get_signup_url ($domain = null, $appname = null) {
- return "http://recaptcha.net/api/getkey?" . _recaptcha_qsencode (array ('domain' => $domain, 'app' => $appname));
- }
- function _recaptcha_aes_pad($val) {
- $block_size = 16;
- $numpad = $block_size - (strlen ($val) % $block_size);
- return str_pad($val, strlen ($val) + $numpad, chr($numpad));
- }
- function _recaptcha_aes_encrypt($val,$ky) {
- if (! function_exists ("mcrypt_encrypt")) {
- die ("To use reCAPTCHA Mailhide, you need to have the mcrypt php module installed.");
- }
- $mode=MCRYPT_MODE_CBC;
- $enc=MCRYPT_RIJNDAEL_128;
- $val=_recaptcha_aes_pad($val);
- return mcrypt_encrypt($enc, $ky, $val, $mode, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0");
- }
- function _recaptcha_mailhide_urlbase64 ($x) {
- return strtr(base64_encode ($x), '+/', '-_');
- }
- function recaptcha_mailhide_url($pubkey, $privkey, $email) {
- if ($pubkey == '' || $pubkey == null || $privkey == "" || $privkey == null) {
- die ("To use reCAPTCHA Mailhide, you have to sign up for a public and private key, " .
- "you can do so at <a href='http://mailhide.recaptcha.net/apikey'>http://mailhide.recaptcha.net/apikey</a>");
- }
-
- $ky = pack('H*', $privkey);
- $cryptmail = _recaptcha_aes_encrypt ($email, $ky);
-
- return "http://mailhide.recaptcha.net/d?k=" . $pubkey . "&c=" . _recaptcha_mailhide_urlbase64 ($cryptmail);
- }
- function _recaptcha_mailhide_email_parts ($email) {
- $arr = preg_split("/@/", $email );
- if (strlen ($arr[0]) <= 4) {
- $arr[0] = substr ($arr[0], 0, 1);
- } else if (strlen ($arr[0]) <= 6) {
- $arr[0] = substr ($arr[0], 0, 3);
- } else {
- $arr[0] = substr ($arr[0], 0, 4);
- }
- return $arr;
- }
- function recaptcha_mailhide_html($pubkey, $privkey, $email) {
- $emailparts = _recaptcha_mailhide_email_parts ($email);
- $url = recaptcha_mailhide_url ($pubkey, $privkey, $email);
-
- return htmlentities($emailparts[0]) . "<a href='" . htmlentities ($url) .
- "' onclick=\"window.open('" . htmlentities ($url) . "', '', 'toolbar=0,scrollbars=0,location=0,statusbar=0,menubar=0,resizable=0,width=500,height=300'); return false;\" title=\"Reveal this e-mail address\">...</a>@" . htmlentities ($emailparts [1]);
- }
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