WPMU Block Spam By Math

@Gid, how did you managed to set up your forum section? I am getting desperate with the styling of BBpress. I would appreciate your help admin@ecoflare.eu

btw. this plugin works for me! (WPMU 2.9.1)

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Thanks James

Its works like a charm! Now my Buddypress site is powered with your preety plug-in

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Bedo, I’ve updated the plugin using BP 1.2.3. BP added a new hook in their core that makes my manual edit no longer necessary. It also makes their process a little cleaner than it was. If you’ve updated to BP 1.2.3 (I assume the change is in 1.2.2 as well) then you no longer need the old default theme (and this plugin will no longer work with it). Switching to the new default theme and updating this plugin to v1.2 should take care of the problem. Let me know if there is still an issue.

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HI. I wanted to change addition to subtraction. I have changed the plus sign to a minus sign and of course the html message. trying to register with a wrong number I can still register.
here is my code:
<?php
/*
Plugin Name: WPMU-Block-Spam-By-Math
Plugin URI: http://www.jamespegram.com/wpmu-block-spam-by-math/
Description: This plugin protects your WPMU signup process against spambots with a simple math question. This plugin is based on the Block-Spam-By-Math plugin created by Alexander Grau. This only protects the new blog creation process and the new user creation process. If you wish to have individual blog protection use the regular Block-Spam-By-Math plugin on individual blogs.
Author: James Pegram (based on the work by Alexander Grau)
Version: 1.1
Author URI: http://www.realitywired.com
*/

/* Copyright 2009

James Pegram (email : jwpegram [make-an-at] gmail [make-a-dot] com)
Alexander Grau (email : alex [make-an-at] grauonline [make-a-dot] de)

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/

if ( !class_exists( ‘wpmuBlockSpamByMath’ ) ) {
class wpmuBlockSpamByMath {

// Constructor
function wpmuBlockSpamByMath() {

// WPMU specific actions/filters
add_action(‘wpmu_options’, array( &$this, ‘blockspam_site_admin_options’));
add_action(‘update_wpmu_options’, array( &$this, ‘blockspam_site_admin_options_process’));
add_action(‘wp_head’, array( &$this, ‘blockspam_stylesheet’) );
add_action( ‘signup_extra_fields’, array( &$this, ‘wpmu_add_hidden_fields’ ) );
add_action( ‘bp_before_registration_submit_buttons’, array( &$this, ‘wpmu_add_hidden_fields’ ) );

add_filter(‘wpmu_validate_user_signup’, array( &$this, ‘wpmu_validate_user_signup’ ) );
add_filter(‘bp_before_current_signup_step’, array( &$this, ‘wpmu_validate_user_signup’ ) );
add_filter(‘signup_blogform’, array( &$this, ‘wpmu_add_hidden_blogfields’ ) );

// We don’t want this filter applied if we’re outside of the initial MU signup process (ie: don’t apply it to the wp-ativate function calls).
if ($_POST['stage'] != ‘validate-user-signup’) { remove_filter(‘wpmu_validate_user_signup’,array( &$this, ‘wpmu_validate_user_signup’ ) ); }
}

// Initialize plugin
function init() {
if ( function_exists( ‘load_plugin_textdomain’ ) ) {
load_plugin_textdomain( ‘wpmu-block-spam-by-math’, PLUGINDIR.’/’.dirname(plugin_basename(__FILE__)) );
}
}

// Protection function for submitted comment form
function wpmu_validate_user_signup( $content ) {
$this->wpmu_check_hidden_fields();
return $content;
}

// Add hidden fields to the signnup form
/* function wpmu_add_hidden_fields() {
$mathvalue0 = rand(2, 15);
$mathvalue1 = rand(2, 15);
echo ‘IMPORTANT! To be able to proceed, you need to solve the following simple math (so we know that you are a human) ‘;
echo “What is $mathvalue0 + $mathvalue1 ?”;
echo ”;
echo ”;
echo ‘Please leave these two fields as-is: ‘;
echo “”;
echo “”;
echo ”;
}
*/

//add to the constractor values for this …
//or change + to minus altogether
// Add hidden fields to the signnup form

function wpmu_add_hidden_fields() {
$mathvalue0 = rand(10, 20);
$mathvalue1 = rand(1, 10);
echo ‘IMPORTANT! To be able to proceed, you need to solve the following simple math (so we know that you are a human) ‘;
echo “What is $mathvalue0 – $mathvalue1 ?”;
echo ”;
echo ”;
echo ‘Please leave these two fields as-is: ‘;
echo “”;
echo “”;
echo ”;
}

// Pass the hidden fields to the blog form
function wpmu_add_hidden_blogfields() {
if ( !empty( $_POST['mathvalue0']) && !empty($_POST['mathvalue1'] ) && !empty($_POST['mathvalue2'])) {
echo “”;
echo “”;
echo “”;
}
}

function blockspam_stylesheet() {
?>

.mu_register .error {font-size: 12px; margin:5px 0; }
.mu_register #spambot {font-size: 12px; margin:10px 0; }
#spambot {clear:both; font-size: 12px; margin:10px 0;}

<?php
}

// If from WPMU wp-signup check for hidden fields and kick an error instead of dieing.
function wpmu_check_hidden_fields() {

// Get values from POST data
$val0 = '';
$val1 = '';
$val2 = '';
if ( isset( $_POST['mathvalue0'] ) ) {
$val0 = $_POST['mathvalue0'];
}
if ( isset( $_POST['mathvalue1'] ) ) {
$val1 = $_POST['mathvalue1'];
}
if ( isset( $_POST['mathvalue2'] ) ) {
$val2 = $_POST['mathvalue2'];
}

// Check values
//if ( ( $val0 == '' ) || ( $val1 == '' ) || ( intval($val2) != (intval($val0) + intval($val1)) ) ) {
if ( ( $val0 == '' ) || ( $val1 == '' ) || ( intval($val2) != (intval($val0) – intval($val1)) ) ) {

$error = get_site_option('blockspam_error');
echo '’ . $error . ”;
exit;
}

}

function blockspam_site_admin_options_process() {
update_site_option( ‘blockspam_error’ , $_POST['blockspam_error'] );
}

function blockspam_site_admin_options() {
?>

<?php _e('spammers … get a life! ‘) ?>
<?php _e('You can really do better things in life.‘) ?>

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