mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/ConfirmEdit
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275 lines
9.8 KiB
PHP
275 lines
9.8 KiB
PHP
<?php
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/**
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* This is a PHP library that handles calling reCAPTCHA.
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* - Documentation and latest version
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* http://recaptcha.net/plugins/php/
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* - Get a reCAPTCHA API Key
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* https://www.google.com/recaptcha/admin/create
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* - Discussion group
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* http://groups.google.com/group/recaptcha
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*
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* Copyright (c) 2007 reCAPTCHA -- http://recaptcha.net
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* AUTHORS:
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* Mike Crawford
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* Ben Maurer
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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/**
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* The reCAPTCHA server URL's
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*/
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define( "RECAPTCHA_API_SERVER", "http://www.google.com/recaptcha/api" );
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define( "RECAPTCHA_API_SECURE_SERVER", "https://www.google.com/recaptcha/api" );
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define( "RECAPTCHA_VERIFY_SERVER", "www.google.com" );
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/**
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* Encodes the given data into a query string format
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* @param $data - array of string elements to be encoded
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* @return string - encoded request
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*/
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function _recaptcha_qsencode ( $data ) {
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$req = "";
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foreach ( $data as $key => $value )
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$req .= $key . '=' . urlencode( stripslashes( $value ) ) . '&';
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// Cut the last '&'
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$req = substr( $req, 0, strlen( $req ) -1 );
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return $req;
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}
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/**
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* Submits an HTTP POST to a reCAPTCHA server
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* @param string $host
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* @param string $path
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* @param array $data
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* @param int port
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* @return array response
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*/
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function _recaptcha_http_post( $host, $path, $data, $port = 80 ) {
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$req = _recaptcha_qsencode ( $data );
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$http_request = "POST $path HTTP/1.0\r\n";
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$http_request .= "Host: $host\r\n";
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$http_request .= "Content-Type: application/x-www-form-urlencoded;\r\n";
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$http_request .= "Content-Length: " . strlen( $req ) . "\r\n";
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$http_request .= "User-Agent: reCAPTCHA/PHP\r\n";
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$http_request .= "\r\n";
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$http_request .= $req;
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$response = '';
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if ( false == ( $fs = @fsockopen( $host, $port, $errno, $errstr, 10 ) ) ) {
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die ( 'Could not open socket' );
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}
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fwrite( $fs, $http_request );
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while ( !feof( $fs ) )
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$response .= fgets( $fs, 1160 ); // One TCP-IP packet
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fclose( $fs );
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$response = explode( "\r\n\r\n", $response, 2 );
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return $response;
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}
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/**
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* Gets the challenge HTML (javascript and non-javascript version).
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* This is called from the browser, and the resulting reCAPTCHA HTML widget
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* is embedded within the HTML form it was called from.
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* @param string $pubkey A public key for reCAPTCHA
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* @param string $error The error given by reCAPTCHA (optional, default is null)
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* @param boolean $use_ssl Should the request be made over ssl? (optional, default is false)
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* @return string - The HTML to be embedded in the user's form.
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*/
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function recaptcha_get_html ( $pubkey, $error = null, $use_ssl = false )
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{
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if ( $pubkey == null || $pubkey == '' ) {
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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>" );
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}
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if ( $use_ssl ) {
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$server = RECAPTCHA_API_SECURE_SERVER;
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} else {
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$server = RECAPTCHA_API_SERVER;
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}
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$errorpart = "";
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if ( $error ) {
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$errorpart = "&error=" . $error;
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}
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return '<script type="text/javascript" src="' . $server . '/challenge?k=' . $pubkey . $errorpart . '"></script>
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<noscript>
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<iframe src="' . $server . '/noscript?k=' . $pubkey . $errorpart . '" height="300" width="500" frameborder="0"></iframe><br/>
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<textarea name="recaptcha_challenge_field" rows="3" cols="40"></textarea>
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<input type="hidden" name="recaptcha_response_field" value="manual_challenge"/>
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</noscript>';
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}
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/**
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* A ReCaptchaResponse is returned from recaptcha_check_answer()
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*/
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class ReCaptchaResponse {
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public $is_valid;
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public $error;
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}
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/**
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* Calls an HTTP POST function to verify if the user's guess was correct
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* @param string $privkey
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* @param string $remoteip
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* @param string $challenge
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* @param string $response
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* @param array $extra_params an array of extra variables to post to the server
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* @return ReCaptchaResponse
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*/
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function recaptcha_check_answer ( $privkey, $remoteip, $challenge, $response, $extra_params = array() )
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{
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if ( $privkey == null || $privkey == '' ) {
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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>" );
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}
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if ( $remoteip == null || $remoteip == '' ) {
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die ( "For security reasons, you must pass the remote ip to reCAPTCHA" );
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}
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// discard spam submissions
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if ( $challenge == null || strlen( $challenge ) == 0 || $response == null || strlen( $response ) == 0 ) {
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$recaptcha_response = new ReCaptchaResponse();
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$recaptcha_response->is_valid = false;
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$recaptcha_response->error = 'incorrect-captcha-sol';
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return $recaptcha_response;
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}
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$response = _recaptcha_http_post ( RECAPTCHA_VERIFY_SERVER, "/recaptcha/api/verify",
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array (
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'privatekey' => $privkey,
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'remoteip' => $remoteip,
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'challenge' => $challenge,
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'response' => $response
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) + $extra_params
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);
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$answers = explode ( "\n", $response [1] );
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$recaptcha_response = new ReCaptchaResponse();
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if ( trim ( $answers [0] ) == 'true' ) {
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$recaptcha_response->is_valid = true;
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}
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else {
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$recaptcha_response->is_valid = false;
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$recaptcha_response->error = $answers [1];
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}
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return $recaptcha_response;
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}
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/**
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* gets a URL where the user can sign up for reCAPTCHA. If your application
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* has a configuration page where you enter a key, you should provide a link
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* using this function.
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* @param string $domain The domain where the page is hosted
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* @param string $appname The name of your application
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*/
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function recaptcha_get_signup_url ( $domain = null, $appname = null ) {
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return "https://www.google.com/recaptcha/admin/create?" . _recaptcha_qsencode ( array ( 'domains' => $domain, 'app' => $appname ) );
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}
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function _recaptcha_aes_pad( $val ) {
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$block_size = 16;
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$numpad = $block_size - ( strlen ( $val ) % $block_size );
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return str_pad( $val, strlen ( $val ) + $numpad, chr( $numpad ) );
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}
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/* Mailhide related code */
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function _recaptcha_aes_encrypt( $val, $ky ) {
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if ( ! function_exists ( "mcrypt_encrypt" ) ) {
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die ( "To use reCAPTCHA Mailhide, you need to have the mcrypt php module installed." );
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}
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$mode = MCRYPT_MODE_CBC;
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$enc = MCRYPT_RIJNDAEL_128;
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$val = _recaptcha_aes_pad( $val );
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return mcrypt_encrypt( $enc, $ky, $val, $mode, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0" );
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}
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function _recaptcha_mailhide_urlbase64 ( $x ) {
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return strtr( base64_encode ( $x ), '+/', '-_' );
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}
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/* gets the reCAPTCHA Mailhide url for a given email, public key and private key */
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function recaptcha_mailhide_url( $pubkey, $privkey, $email ) {
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if ( $pubkey == '' || $pubkey == null || $privkey == "" || $privkey == null ) {
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die ( "To use reCAPTCHA Mailhide, you have to sign up for a public and private key, " .
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"you can do so at <a href='http://www.google.com/recaptcha/mailhide/apikey'>http://www.google.com/recaptcha/mailhide/apikey</a>" );
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}
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$ky = pack( 'H*', $privkey );
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$cryptmail = _recaptcha_aes_encrypt ( $email, $ky );
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return "http://www.google.com/recaptcha/mailhide/d?k=" . $pubkey . "&c=" . _recaptcha_mailhide_urlbase64 ( $cryptmail );
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}
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/**
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* gets the parts of the email to expose to the user.
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* eg, given johndoe@example,com return ["john", "example.com"].
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* the email is then displayed as john...@example.com
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*/
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function _recaptcha_mailhide_email_parts ( $email ) {
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$arr = preg_split( "/@/", $email );
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if ( strlen ( $arr[0] ) <= 4 ) {
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$arr[0] = substr ( $arr[0], 0, 1 );
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} elseif ( strlen ( $arr[0] ) <= 6 ) {
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$arr[0] = substr ( $arr[0], 0, 3 );
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} else {
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$arr[0] = substr ( $arr[0], 0, 4 );
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}
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return $arr;
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}
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/**
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* Gets html to display an email address given a public an private key.
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* to get a key, go to:
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*
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* http://www.google.com/recaptcha/mailhide/apikey
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*/
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function recaptcha_mailhide_html( $pubkey, $privkey, $email ) {
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$emailparts = _recaptcha_mailhide_email_parts ( $email );
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$url = recaptcha_mailhide_url ( $pubkey, $privkey, $email );
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return htmlentities( $emailparts[0] ) . "<a href='" . htmlentities ( $url ) .
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"' 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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}
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