Meelky Blog

<?php 
 class RecaptchaComponent extends Object {
	var $publickey = "";
	var $privatekey= "";
 
	var $is_valid = false;
	var $error = "";
 
	function startup(&$controller){
		Configure::write("Recaptcha.apiServer","http://api.recaptcha.net");
		Configure::write("Recaptcha.apiSecureServer","https://api-secure.recaptcha.net");
		Configure::write("Recaptcha.verifyServer","api-verify.recaptcha.net");
		Configure::write("Recaptcha.pubKey", $this->publickey);
		Configure::write("Recaptcha.privateKey", $this->privatekey);
 
		$this->controller =& $controller;
		$this->controller->helpers[] = "Recaptcha";
	}
 
	function valid($form){
        if (isset($form['recaptcha_challenge_field']) && isset($form['recaptcha_response_field'])){
        	if($this->recaptcha_check_answer(
                $this->privatekey, 
                $_SERVER["REMOTE_ADDR"],
                $form['recaptcha_challenge_field'], 
                $form['recaptcha_response_field']
            ) == 0)
            	return false;
 
            if ($this->is_valid)
                return true;
        }
        return false;
    }
 
	/**
	  * Calls an HTTP POST function to verify if the user's guess was correct
	  * @param string $privkey
	  * @param string $remoteip
	  * @param string $challenge
	  * @param string $response
	  * @param array $extra_params an array of extra variables to post to the server
	  * @return ReCaptchaResponse
	  */
	function recaptcha_check_answer ($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");
		}		
 
	        //discard spam submissions
	        if ($challenge == null || strlen($challenge) == 0 || $response == null || strlen($response) == 0) {
	                $this->is_valid = false;
	                $this->error = 'incorrect-captcha-sol';
	                return 0;
	        }
 
	        $response = $this->_recaptcha_http_post(Configure::read('Recaptcha.verifyServer'), "/verify",
	                                          array (
	                                                 'privatekey' => $privkey,
	                                                 'remoteip' => $remoteip,
	                                                 'challenge' => $challenge,
	                                                 'response' => $response
	                                                 ) + $extra_params
	                                          );
 
	        $answers = explode ("\n", $response [1]);
 
	        if (trim ($answers [0]) == 'true') {
	                $this->is_valid = true;
	                return 1;
	        }else{
	                $this->is_valid = false;
	                $this->error = $answers [1];
	                return 0;
	        }
	}
 
 
	/**
	 * Submits an HTTP POST to a reCAPTCHA server
	 * @param string $host
	 * @param string $path
	 * @param array $data
	 * @param int port
	 * @return array response
	 */
	function _recaptcha_http_post($host, $path, $data, $port = 80) {
 
        $req = $this->_recaptcha_qsencode ($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); // One TCP-IP packet
        fclose($fs);
        $response = explode("\r\n\r\n", $response, 2);
 
        return $response;
	}
 
 
	/**
	 * Encodes the given data into a query string format
	 * @param $data - array of string elements to be encoded
	 * @return string - encoded request
	 */
	function _recaptcha_qsencode ($data) {
        $req = "";
        foreach ( $data as $key => $value )
                $req .= $key . '=' . urlencode( stripslashes($value) ) . '&';
 
        // Cut the last '&'
        $req=substr($req,0,strlen($req)-1);
        return $req;
	}
}
?>

<?php 
class RecaptchaHelper extends AppHelper {
	var $helpers = array('form'); 
 
	function display_form($output_method = 'return', $error = null, $use_ssl = false){
		$data = $this->__form(Configure::read("Recaptcha.pubKey"),$error,$use_ssl);
		if($output_method == "echo")
			echo $data;
		else
			return $data;
	}
 
	function hide_mail($email = '',$output_method = 'return'){
		$data = $this->recaptcha_mailhide_html(Configure::read('Recaptcha.pubKey'), Configure::read('Recaptcha.privateKey'), $email);
		if($output_method == "echo")
			echo $data;
		else
			return $data;
	}
 
	/**
	 * Gets the challenge HTML (javascript and non-javascript version).
	 * This is called from the browser, and the resulting reCAPTCHA HTML widget
	 * is embedded within the HTML form it was called from.
	 * @param string $pubkey A public key for reCAPTCHA
	 * @param string $error The error given by reCAPTCHA (optional, default is null)
	 * @param boolean $use_ssl Should the request be made over ssl? (optional, default is false)
 
	 * @return string - The HTML to be embedded in the user's form.
	 */
	function __form($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 = Configure::read('Recaptcha.apiSecureServer');
	        } else {
	                $server = Configure::read('Recaptcha.apiServer');
	        }
 
	        $errorpart = "";
	        if ($error) {
	           $errorpart = "&amp;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"/>
	  		<input type="hidden" name="recaptcha_response_field" value="manual_challenge"/>
		</noscript>';
	}
 
	/* Mailhide related code */
	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;
		$val=$this->_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), '+/', '-_');
	}
 
	/* gets the reCAPTCHA Mailhide url for a given email, public key and private key */
	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 = $this->_recaptcha_aes_encrypt ($email, $ky);
 
		return "http://mailhide.recaptcha.net/d?k=" . $pubkey . "&c=" . $this->_recaptcha_mailhide_urlbase64 ($cryptmail);
	}
 
	/**
	 * gets the parts of the email to expose to the user.
	 * eg, given johndoe@example,com return ["john", "example.com"].
	 * the email is then displayed as john...@example.com
	 */
	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;
	}
 
	/**
	 * Gets html to display an email address given a public an private key.
	 * to get a key, go to:
	 *
	 * http://mailhide.recaptcha.net/apikey
	 */
	function recaptcha_mailhide_html($pubkey, $privkey, $email) {
		$emailparts = $this->_recaptcha_mailhide_email_parts ($email);
		$url = $this->recaptcha_mailhide_url ($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]);
 
	}
 
 
}
?>

$components = array("recaptcha");
$helpers = array("recaptcha");
$this->recaptcha->publickey = "";
$this->recaptcha->privatekey = "";
}
?>

<?
display_form('echo')
//Спрятать адрес.
 $recaptcha->hide_mail("someuser@somdomain.tld",'echo');
?>

<?
Recaptcha->valid($this->params['form']))
  //Введёный текст верен
else
  //Пользователь ошибся при вводе
?>