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Diffstat (limited to 'extensions/ConfirmEdit/ReCaptcha/recaptchalib.php')
| -rw-r--r-- | extensions/ConfirmEdit/ReCaptcha/recaptchalib.php | 274 |
1 files changed, 274 insertions, 0 deletions
diff --git a/extensions/ConfirmEdit/ReCaptcha/recaptchalib.php b/extensions/ConfirmEdit/ReCaptcha/recaptchalib.php new file mode 100644 index 00000000..a04f5673 --- /dev/null +++ b/extensions/ConfirmEdit/ReCaptcha/recaptchalib.php @@ -0,0 +1,274 @@ +<?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 = "&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 { + public $is_valid; + public $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 ); + } elseif ( 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] ); + +} |