Added TReCaptcha control (ticket #345) and added a notice about the lack of security of TCaptcha (ticket #344)

8 files changed, 596 insertions, 2 deletions

diff --git a/framework/3rdParty/ReCaptcha/LICENSE b/framework/3rdParty/ReCaptcha/LICENSE
new file mode 100644
index 00000000..b612f71f
--- /dev/null
+++ b/framework/3rdParty/ReCaptcha/LICENSE
@@ -0,0 +1,22 @@
+Copyright (c) 2007 reCAPTCHA -- http://recaptcha.net
+AUTHORS:
+  Mike Crawford
+  Ben Maurer
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
diff --git a/framework/3rdParty/ReCaptcha/recaptchalib.php b/framework/3rdParty/ReCaptcha/recaptchalib.php
new file mode 100644
index 00000000..32c4f4d7
--- /dev/null
+++ b/framework/3rdParty/ReCaptcha/recaptchalib.php
@@ -0,0 +1,277 @@
+<?php
+/*
+ * This is a PHP library that handles calling reCAPTCHA.
+ *    - Documentation and latest version
+ *          http://recaptcha.net/plugins/php/
+ *    - Get a reCAPTCHA API Key
+ *          https://www.google.com/recaptcha/admin/create
+ *    - Discussion group
+ *          http://groups.google.com/group/recaptcha
+ *
+ * Copyright (c) 2007 reCAPTCHA -- http://recaptcha.net
+ * AUTHORS:
+ *   Mike Crawford
+ *   Ben Maurer
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+/**
+ * The reCAPTCHA server URL's
+ */
+define("RECAPTCHA_API_SERVER", "http://www.google.com/recaptcha/api");
+define("RECAPTCHA_API_SECURE_SERVER", "https://www.google.com/recaptcha/api");
+define("RECAPTCHA_VERIFY_SERVER", "www.google.com");
+
+/**
+ * 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;
+}
+
+
+
+/**
+ * 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) {
+
+        $req = _recaptcha_qsencode ($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;
+}
+
+
+
+/**
+ * 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 $use_ssl Should the request be made over ssl? (optional, default is false)
+
+ * @return string - The HTML to be embedded in the user's form.
+ */
+function recaptcha_get_html ($pubkey, $error = null, $use_ssl = false)
+{
+	if ($pubkey == null || $pubkey == '') {
+		die ("To use reCAPTCHA you must get an API key from <a href='https://www.google.com/recaptcha/admin/create'>https://www.google.com/recaptcha/admin/create</a>");
+	}
+	
+	if ($use_ssl) {
+                $server = RECAPTCHA_API_SECURE_SERVER;
+        } else {
+                $server = RECAPTCHA_API_SERVER;
+        }
+
+        $errorpart = "";
+        if ($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"/>
+	</noscript>';
+}
+
+
+
+
+/**
+ * A ReCaptchaResponse is returned from recaptcha_check_answer()
+ */
+class ReCaptchaResponse {
+        var $is_valid;
+        var $error;
+}
+
+
+/**
+  * 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 || $privkey == '') {
+		die ("To use reCAPTCHA you must get an API key from <a href='https://www.google.com/recaptcha/admin/create'>https://www.google.com/recaptcha/admin/create</a>");
+	}
+
+	if ($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) {
+                $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, "/recaptcha/api/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;
+
+}
+
+/**
+ * gets a URL where the user can sign up for reCAPTCHA. If your application
+ * has a configuration page where you enter a key, you should provide a link
+ * using this function.
+ * @param string $domain The domain where the page is hosted
+ * @param string $appname The name of your application
+ */
+function recaptcha_get_signup_url ($domain = null, $appname = null) {
+	return "https://www.google.com/recaptcha/admin/create?" .  _recaptcha_qsencode (array ('domains' => $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));
+}
+
+/* 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;
+	$val=_recaptcha_aes_pad($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://www.google.com/recaptcha/mailhide/apikey'>http://www.google.com/recaptcha/mailhide/apikey</a>");
+	}
+	
+
+	$ky = pack('H*', $privkey);
+	$cryptmail = _recaptcha_aes_encrypt ($email, $ky);
+	
+	return "http://www.google.com/recaptcha/mailhide/d?k=" . $pubkey . "&c=" . _recaptcha_mailhide_urlbase64 ($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 $arr;
+}
+
+/**
+ * Gets html to display an email address given a public an private key.
+ * to get a key, go to:
+ *
+ * http://www.google.com/recaptcha/mailhide/apikey
+ */
+function recaptcha_mailhide_html($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]);
+
+}
+
+
+?>
diff --git a/framework/3rdParty/readme.html b/framework/3rdParty/readme.html
index e545615c..bbf3a3a7 100644
--- a/framework/3rdParty/readme.html
+++ b/framework/3rdParty/readme.html
@@ -19,6 +19,13 @@ projects.
 </tr>

 

 <tr>

+  <td><a href="ReCaptcha">ReCaptcha</a></td>

+  <td><a href="http://www.google.com/recaptcha">ReCaptcha - Stop spam, read books</a></td>

+  <td><a href="ReCaptcha/LICENSE">BSD-like</a></td>

+  <td>System.Web.UI.WebControls.TReCaptcha</td>

+  <td>ReCaptcha php documentation available at http://recaptcha.net/plugins/php</td>

+</tr>

+<tr>

   <td><a href="TextHighlighter">Text_Highlighter</a></td>

   <td><a href="http://pear.php.net/package/Text_Highlighter/">Text_Highlighter - Generic Syntax Highlighter</a> (v0.7.0 beta)</td>

   <td><a href="http://www.php.net/license/3_01.txt">The PHP License</a></td>

diff --git a/framework/Exceptions/messages/messages.txt b/framework/Exceptions/messages/messages.txt
index fd85920c..cc72d6a2 100644
--- a/framework/Exceptions/messages/messages.txt
+++ b/framework/Exceptions/messages/messages.txt
@@ -455,6 +455,15 @@ captcha_gd2_required					= TCaptcha requires PHP GD2 extension.
 captcha_imagettftext_required			= TCaptcha requires PHP GD2 extension with TrueType font support.
 captcha_imagepng_required				= TCaptcha requires PHP GD2 extension with PNG image format support.
 
+captchavalidator_captchacontrol_required	= TReCaptchaValidator.CaptchaControl must point to an existing TCaptcha control.
+captchavalidator_captchacontrol_inexistent	= TReCaptchaValidator.CaptchaControl {0} must point to an existing TCaptcha control.
+captchavalidator_captchacontrol_invalid		= TReCaptchaValidator.CaptchaControl {0} must point to an existing TCaptcha control.
+
+recaptcha_privatekey_unknown				= TReCaptcha.PrivateKey is unknown. To use reCAPTCHA you must get an API key.
+recaptcha_publickey_unknown				= TReCaptcha.PublicKey is unknown. To use reCAPTCHA you must get an API key.
+
+recaptchavalidator_captchacontrol_invalid		= TReCaptchaValidator.ControlToValidate must be an instance of TReCaptcha.
+
 slider_handle_class_invalid				= TSlider.HandleClass '{0}' is not a valid user class. The class must extends TSliderHandle.
 
 cachepagestatepersister_cachemoduleid_invalid = TCachePageStatePersister.CacheModuleID '{0}' does not point to a valid cache module.
diff --git a/framework/Web/UI/WebControls/TCaptcha.php b/framework/Web/UI/WebControls/TCaptcha.php
index 9ca6aa76..7eff1294 100644
--- a/framework/Web/UI/WebControls/TCaptcha.php
+++ b/framework/Web/UI/WebControls/TCaptcha.php
@@ -4,7 +4,7 @@
  *

  * @author Qiang Xue <qiang.xue@gmail.com>

  * @link http://www.pradosoft.com/

- * @copyright Copyright &copy; 2005-2011 PradoSoft
+ * @copyright Copyright &copy; 2005-2011 PradoSoft

  * @license http://www.pradosoft.com/license/

  * @version $Id$

  * @package System.Web.UI.WebControls

@@ -15,6 +15,10 @@ Prado::using('System.Web.UI.WebControls.TImage');
 /**

  * TCaptcha class.

  *

+ * Notice: while this class is easy to use and implement, it does not provide full security.

+ * In fact, it's easy to bypass the checks reusing old, already-validated tokens (reply attack).

+ * A better alternative is provided by {@link TReCaptcha}.

+ *

  * TCaptcha displays a CAPTCHA (a token displayed as an image) that can be used

  * to determine if the input is entered by a real user instead of some program.

  *

diff --git a/framework/Web/UI/WebControls/TCaptchaValidator.php b/framework/Web/UI/WebControls/TCaptchaValidator.php
index 7854b639..b01cd786 100644
--- a/framework/Web/UI/WebControls/TCaptchaValidator.php
+++ b/framework/Web/UI/WebControls/TCaptchaValidator.php
@@ -4,7 +4,7 @@
  *

  * @author Qiang Xue <qiang.xue@gmail.com>

  * @link http://www.pradosoft.com/

- * @copyright Copyright &copy; 2005-2011 PradoSoft
+ * @copyright Copyright &copy; 2005-2011 PradoSoft

  * @license http://www.pradosoft.com/license/

  * @version $Id$

  * @package System.Web.UI.WebControls

@@ -16,6 +16,10 @@ Prado::using('System.Web.UI.WebControls.TCaptcha');
 /**

  * TCaptchaValidator class

  *

+ * Notice: while this class is easy to use and implement, it does not provide full security.

+ * In fact, it's easy to bypass the checks reusing old, already-validated tokens (reply attack).

+ * A better alternative is provided by {@link TReCaptchaValidator}.

+ *

  * TCaptchaValidator validates user input against a CAPTCHA represented by

  * a {@link TCaptcha} control. The input control fails validation if its value

  * is not the same as the token displayed in CAPTCHA. Note, if the user does

diff --git a/framework/Web/UI/WebControls/TReCaptcha.php b/framework/Web/UI/WebControls/TReCaptcha.php
new file mode 100644
index 00000000..bb956bcb
--- /dev/null
+++ b/framework/Web/UI/WebControls/TReCaptcha.php
@@ -0,0 +1,199 @@
+<?php

+

+/**

+ * TReCaptcha class file

+ *

+ * @author Bérczi Gábor <gabor.berczi@devworx.hu>

+ * @link http://www.devworx.hu/

+ * @copyright Copyright &copy; 2011 DevWorx

+ * @license http://www.pradosoft.com/license/

+ * @package System.Web.UI.WebControls

+ */

+

+	Prado::using('System.3rdParty.ReCaptcha.recaptchalib');

+

+/**

+ * TReCaptcha class.

+ *

+ * TReCaptcha displays a reCAPTCHA (a token displayed as an image) that can be used

+ * to determine if the input is entered by a real user instead of some program. It can

+ * also prevent multiple submits of the same form either by accident, or on purpose (ie. spamming).

+ *

+ * The reCAPTCHA to solve (a string consisting of two separate words) displayed is automatically

+ * generated by the reCAPTCHA system at recaptcha.net. However, in order to use the services

+ * of the site you will need to register and get a public and a private API key pair, and 

+ * supply those to the reCAPTCHA control through setting the {@link setPrivateKey PrivateKey} 

+ * and {@link setPublicKey PublicKey} properties. 

+ *

+ * Currently the reCAPTCHA API supports only one reCAPTCHA field per page, so you MUST make sure that all 

+ * your input is protected and validated by a single reCAPTCHA control. Placing more than one reCAPTCHA

+ * control on the page will lead to unpredictable results, and the user will most likely unable to solve 

+ * any of them successfully.

+ *

+ * Upon postback, user input can be validated by calling {@link validate()}.

+ * The {@link TReCaptchaValidator} control can also be used to do validation, which provides

+ * server-side validation. Calling (@link validate()) will invalidate the token supplied, so all consecutive

+ * calls to the method - without solving a new captcha - will return false. Therefore if implementing a multi-stage

+ * input process, you must make sure that you call validate() only once, either at the end of the input process, or 

+ * you store the result till the end of the processing.

+ *

+ * The following template shows a typical use of TReCaptcha control:

+ * <code>

+ * <com:TReCaptcha ID="Captcha"

+ *                 PublicKey="..."

+ *                 PrivateKey="..."

+ * />

+ * <com:TReCaptchaValidator ControlToValidate="Captcha"

+ *                          ErrorMessage="You are challenged!" />

+ * </code>

+ *

+ * @author Bérczi Gábor <gabor.berczi@devworx.hu>

+ * @package System.Web.UI.WebControls

+ * @since 3.2

+ */

+class TReCaptcha extends TControl implements IValidatable

+{

+	private $_isValid=true;

+

+	const ChallengeFieldName = 'recaptcha_challenge_field';

+	const ResponseFieldName = 'recaptcha_response_field';

+	

+	/**

+	 * Returns true if this control validated successfully. 

+	 * Defaults to true.

+	 * @return bool wether this control validated successfully.

+	 */

+	public function getIsValid()

+	{

+		return $this->_isValid;

+	}

+	/**

+	 * @param bool wether this control is valid.

+	 */

+	public function setIsValid($value)

+	{

+		$this->_isValid=TPropertyValue::ensureBoolean($value);

+	}

+	

+	public function getValidationPropertyValue()

+	{

+		return $this->Request[$this->getChallengeFieldName()];

+	}

+

+	public function getPublicKey()

+	{

+		return $this->getViewState('PublicKey');

+	}

+

+	public function setPublicKey($value)

+	{

+		return $this->setViewState('PublicKey', TPropertyValue::ensureString($value));

+	}

+

+	public function getPrivateKey()

+	{

+		return $this->getViewState('PrivateKey');

+	}

+

+	public function setPrivateKey($value)

+	{

+		return $this->setViewState('PrivateKey', TPropertyValue::ensureString($value));

+	}

+	

+	public function getThemeName()

+	{

+		return $this->getViewState('ThemeName');

+	}

+

+	public function setThemeName($value)

+	{

+		return $this->setViewState('ThemeName', TPropertyValue::ensureString($value));

+	}

+

+	public function getCustomTranslations()

+	{

+		return TPropertyValue::ensureArray($this->getViewState('CustomTranslations'));

+	}

+

+	public function setCustomTranslations($value)

+	{

+		return $this->setViewState('CustomTranslations', TPropertyValue::ensureArray($value));

+	}

+

+	public function getLanguage()

+	{

+		return $this->getViewState('Language');

+	}

+

+	public function setLanguage($value)

+	{

+		return $this->setViewState('Language', TPropertyValue::ensureString($value));

+	}

+

+	protected function getChallengeFieldName()

+	{

+		return /*$this->ClientID.'_'.*/self::ChallengeFieldName;

+	}

+	

+	protected function getResponseFieldName()

+	{

+		return /*$this->ClientID.'_'.*/self::ResponseFieldName;

+	}

+	

+	public function getClientSideOptions()

+	{

+		$options = array();

+		if ($theme = $this->getThemeName())

+			$options['theme'] = $theme;

+		if ($lang = $this->getLanguage())

+			$options['lang'] = $lang;

+		if ($trans = $this->getCustomTranslations())

+			$options['custom_translations'] = $trans;

+		return $options;

+	}

+

+	public function validate()

+	{

+		$resp = recaptcha_check_answer(

+			$this->getPrivateKey(),

+			$_SERVER["REMOTE_ADDR"],

+			$_POST[$this->getChallengeFieldName()],

+			$_POST[$this->getResponseFieldName()]

+		); 

+		return ($resp->is_valid==1);

+	}

+

+	/**

+	 * Checks for API keys

+	 * @param mixed event parameter

+	 */

+	public function onPreRender($param)

+	{

+		parent::onPreRender($param);

+		if("" == $this->getPublicKey())

+			throw new TConfigurationException('recaptcha_publickey_unknown');

+		if("" == $this->getPrivateKey())

+			throw new TConfigurationException('recaptcha_privatekey_unknown');

+	}

+

+	public function render($writer)

+	{

+		$writer->write(TJavaScript::renderScriptBlock(

+			'var RecaptchaOptions = '.TJavaScript::jsonEncode($this->getClientSideOptions()).';'

+		));

+	

+		$html = recaptcha_get_html($this->getPublicKey());

+		/*

+		reCAPTCHA currently does not support multiple validations per page

+		$html = str_replace(

+			array(self::ChallengeFieldName,self::ResponseFieldName),

+			array($this->getChallengeFieldName(),$this->getResponseFieldName()),

+			$html

+		);

+		*/

+		$writer->write($html);

+	}

+

+}

+

+?>
\ No newline at end of file
diff --git a/framework/Web/UI/WebControls/TReCaptchaValidator.php b/framework/Web/UI/WebControls/TReCaptchaValidator.php
new file mode 100644
index 00000000..ae94ea59
--- /dev/null
+++ b/framework/Web/UI/WebControls/TReCaptchaValidator.php
@@ -0,0 +1,72 @@
+<?php

+

+/**

+ * TReCaptchaValidator class file

+ *

+ * @author Bérczi Gábor <gabor.berczi@devworx.hu>

+ * @link http://www.devworx.hu/

+ * @copyright Copyright &copy; 2011 DevWorx

+ * @license http://www.pradosoft.com/license/

+ * @package System.Web.UI.WebControls

+ */

+

+Prado::using('System.Web.UI.WebControls.TBaseValidator');

+Prado::using('System.Web.UI.WebControls.TReCaptcha');

+

+/**

+ * TReCaptchaValidator class

+ *

+ * TReCaptchaValidator validates user input against a reCAPTCHA represented by

+ * a {@link TReCaptcha} control. The input control fails validation if its value

+ * is not the same as the token displayed in reCAPTCHA. Note, if the user does

+ * not enter any thing, it is still considered as failing the validation.

+ *

+ * To use TReCaptchaValidator, specify the {@link setControlToValidate ControlToValidate}

+ * to be the ID path of the {@link TReCaptcha} control.

+ *

+ * @author Bérczi Gábor <gabor.berczi@devworx.hu>

+ * @package System.Web.UI.WebControls

+ * @since 3.2

+ */

+class TReCaptchaValidator extends TBaseValidator

+{

+	protected $_isvalid = null;

+

+	/**

+	 * Gets the name of the javascript class responsible for performing validation for this control.

+	 * This method overrides the parent implementation.

+	 * @return string the javascript class name

+	 */

+	protected function getClientClassName()

+	{

+		return '';

+	}

+

+	public function getEnableClientScript()

+	{

+		return false;

+	}

+

+	/**

+	 * This method overrides the parent's implementation.

+	 * The validation succeeds if the input control has the same value

+	 * as the one displayed in the corresponding RECAPTCHA control.

+	 *

+	 * @return boolean whether the validation succeeds

+	 */

+	protected function evaluateIsValid()

+	{

+		// check validity only once (if trying to evaluate multiple times, all redundant checks would fail)

+		if (is_null($this->_isvalid))

+		{

+			$control = $this->getValidationTarget();

+			if(!($control instanceof TCaptcha))

+				throw new TConfigurationException('recaptchavalidator_captchacontrol_invalid');

+			$this->_isvalid = $control->validate();

+		}

+		return ($this->_isvalid==true);

+	}

+

+}

+

+?>
\ No newline at end of file