ps_wp_denyhost.php 
<?php
/*
Plugin Name: WP-DenyHost
Plugin URI: http://soderlind.no/denyhost
Description: Based on a users IP address, WP-DenyHost will block a spammer if he already has been tagged as a spammer. Use it together with the Akismet plugin. Akismet tags the spammer, and WP-DenyHost prevents him from adding more comment spam.
Version: 1.1.3
Author: PerS
Author URI: http://soderlind.no
*/
/*
Changelog:
v1.1.3: Fixed minor bug
v1.1.2: Added response 403 Forbidden
v1.1.1: Added languages/wp-denyhost.pot
v1.1.0: Major rewrite. Added option page
v1.0.1: Replaced LIKE (‘%$suspect%’) with = ‘$suspect’ i.e. look for exact match
v1.0: Initial release
I recommend the plugin template at http://pressography.com/plugins/wordpress-plugin-template/, I used it when I wrote this plugin.
Best regards,
PerS
*/
if (!class_exists('ps_wp_denyhost')) {
class ps_wp_denyhost {
/**
* @var string The options string name for this plugin
*/
var $optionsName = 'ps_wp_denyhost_options';
/**
* @var string $localizationDomain Domain used for localization
*/
var $localizationDomain = "ps_wp_denyhost";
/**
* @var string $pluginurl The path to this plugin
*/
var $url = '';
/**
* @var string $pluginurlpath The path to this plugin
*/
var $urlpath = '';
/**
* @var array $options Stores the options for this plugin
*/
var $options = array();
//Class Functions
/**
* PHP 4 Compatible Constructor
*/
function ps_wp_denyhost(){$this->__construct();}
/**
* PHP 5 Constructor
*/
function __construct(){
//Language Setup
$locale = get_locale();
$mo = plugins_url("/languages/" . $this->localizationDomain . "-".$locale.".mo", __FILE__);
load_textdomain($this->localizationDomain, $mo);
//"Constants" setup
$this->url = plugins_url(basename(__FILE__), __FILE__);
$this->urlpath = plugins_url('', __FILE__);
//Initialize the options
$this->getOptions();
//Actions
add_action("admin_menu", array(&$this,"admin_menu_link"));
add_action('wp_print_scripts', array(&$this,'ps_wp_denyhost_script'));
if ($this->options['ps_wp_denyhost_threshold'] && $this->options['ps_wp_denyhost_threshold'] > 0) {
add_action("init", array(&$this,"ps_wp_denyhost_init"));
}
}
function ps_wp_denyhost_init() {
global $wpdb;
$suspect = $this->get_IP();
$count = (int) $wpdb->get_var("SELECT COUNT(comment_ID) FROM $wpdb->comments WHERE comment_approved = 'spam' AND comment_author_IP = '$suspect'");
if ($count >= $this->options['ps_wp_denyhost_threshold']) {
switch ($this->options['ps_wp_denyhost_response']) {
case '404':
header("HTTP/1.0 404 Not Found");
break;
case '403':
header('HTTP/1.1 403 Forbidden');
break;
case 'google':
header('Location: http://www.google.com/');
break;
}
exit;
}
}
function ps_wp_denyhost_script() {
wp_enqueue_script('jquery');
wp_enqueue_script('jquery-validate', 'http://ajax.microsoft.com/ajax/jquery.validate/1.6/jquery.validate.min.js', array('jquery'));
wp_enqueue_script('ps-wp-denyhost-script', $this->url.'?ps_wp_denyhost_javascript', array('jquery-validate')); // see end of this file
wp_localize_script( 'ps-wp-denyhost-script', 'ps_wp_denyhost_lang', array(
'required' => __('Please enter a number.', $this->localizationDomain),
'number' => __('Please enter a number.', $this->localizationDomain),
'min' => __('Please enter a value greater than or equal to 1.', $this->localizationDomain),
));
}
/**
* @desc Retrieves the users IP address.
*
* get_IP() Credits To Lester 'GaMerZ' Chan - http://lesterchan.net
*/
function get_IP() {
if(empty($_SERVER["HTTP_X_FORWARDED_FOR"])) {
$ip_address = $_SERVER["REMOTE_ADDR"];
} else {
$ip_address = $_SERVER["HTTP_X_FORWARDED_FOR"];
}
if(strpos($ip_address, ',') !== false) {
$ip_address = explode(',', $ip_address);
$ip_address = $ip_address[0];
}
return $ip_address;
}
/**
* @desc Retrieves the plugin options from the database.
* @return array
*/
function getOptions() {
if (!$theOptions = get_option($this->optionsName)) {
$theOptions = array('ps_wp_denyhost_threshold'=> 3, 'ps_wp_denyhost_response' => '403');
update_option($this->optionsName, $theOptions);
}
$this->options = $theOptions;
}
/**
* Saves the admin options to the database.
*/
function saveAdminOptions(){
return update_option($this->optionsName, $this->options);
}
/**
* @desc Adds the options subpanel
*/
function admin_menu_link() {
add_options_page('WP-DenyHost', 'WP-DenyHost', 10, basename(__FILE__), array(&$this,'admin_options_page'));
add_filter( 'plugin_action_links_' . plugin_basename(__FILE__), array(&$this, 'filter_plugin_actions'), 10, 2 );
}
/**
* @desc Adds the Settings link to the plugin activate/deactivate page
*/
function filter_plugin_actions($links, $file) {
$settings_link = '<a href="options-general.php?page=' . basename(__FILE__) . '">' . __('Settings') . '</a>';
array_unshift( $links, $settings_link ); // before other links
return $links;
}
/**T
* Adds settings/options page
*/
function admin_options_page() {
if($_POST['ps_wp_denyhost_save']){
if (! wp_verify_nonce($_POST['_wpnonce'], 'ps_wp_denyhost-update-options') ) die('Whoops! There was a problem with the data you posted. Please go back and try again.');
$this->options['ps_wp_denyhost_threshold'] = (int)$_POST['ps_wp_denyhost_threshold'];
$this->options['ps_wp_denyhost_response'] = $_POST['ps_wp_denyhost_response'];
$this->saveAdminOptions();
echo '<div class="updated"><p>Success! Your changes were sucessfully saved!</p></div>';
}
?>
<div class="wrap">
<h2>WP-DenyHost</h2>
<p>
<?php _e('Based on a users IP address, WP-DenyHost will block a spammer if he already has been tagged as a spammer. Use it together with the Akismet plugin. Akismet tags the spammer, and WP-DenyHost prevents him from adding more comment spam.', $this->localizationDomain); ?>
</p>
<form method="post" id="ps_wp_denyhost_options">
<?php wp_nonce_field('ps_wp_denyhost-update-options'); ?>
<table width="100%" cellspacing="2" cellpadding="5" class="form-table">
<tr valign="top">
<th width="33%" scope="row"><?php _e('Threshold:', $this->localizationDomain); ?></th>
<td>
<input name="ps_wp_denyhost_threshold" type="text" id="ps_wp_denyhost_threshold" size="45" value="<?php echo $this->options['ps_wp_denyhost_threshold'] ;?>"/>
<br /><span class="setting-description"><?php _e('Number of comment spams accepted before blocking a user. This is to prevent an innocent commenter, with comments wrongly tagged as spam, from being blocked.', $this->localizationDomain); ?>
</td>
</tr>
<tr valign="top">
<th><label for="ps_wp_denyhost_response"><?php _e('Response:', $this->localizationDomain); ?></label></th>
<td>
<select id="ps_wp_denyhost_response" name="ps_wp_denyhost_response">
<option value="exit" <?=($this->options['ps_wp_denyhost_response']=="exit")?'selected="selected"':''?>><?php _e('PHP exit', $this->localizationDomain); ?></option>
<option value="404" <?=($this->options['ps_wp_denyhost_response']=="404")?'selected="selected"':''?>><?php _e('404 Not found', $this->localizationDomain); ?></option>
<option value="403" <?=($this->options['ps_wp_denyhost_response']=="403")?'selected="selected"':''?>><?php _e('403 Forbidden', $this->localizationDomain); ?></option>
<option value="google" <?=($this->options['ps_wp_denyhost_response']=="google")?'selected="selected"':''?>><?php _e('Redirect to Google', $this->localizationDomain); ?></option>
</select>
<br /><span class="setting-description"><?php _e('What kind of response a blocked spammer will get', $this->localizationDomain); ?>
</td>
</tr>
</table>
<p class="submit">
<input type="submit" name="ps_wp_denyhost_save" class="button-primary" value="<?php _e('Save Changes', $this->localizationDomain); ?>" /> <a href="/wp-admin/edit-comments.php?comment_status=spam"><?php _e('Edit Comment Spam', $this->localizationDomain); ?></a>
</p>
</form>
<?php
}
} //End Class
} //End if class exists statement
if (isset($_GET['ps_wp_denyhost_javascript'])) {
Header("content-type: application/x-javascript");
echo<<<ENDJS
/**
* @desc WP-DenyHost
* @author Per Soderlind - soderlind.no
*/
jQuery(document).ready(function(){
jQuery("#ps_wp_denyhost_options").validate({
rules: {
ps_wp_denyhost_threshold: {
required: true,
number: true,
min: 1
}
},
messages: {
ps_wp_denyhost_threshold: {
// the ps_wp_denyhost_lang object is define using wp_localize_script() in function ps_wp_denyhost_script()
required: ps_wp_denyhost_lang.required,
number: ps_wp_denyhost_lang.number,
min: ps_wp_denyhost_lang.min
}
}
});
});
ENDJS;
} else {
if (class_exists('ps_wp_denyhost')) {
$ps_wp_denyhost_var = new ps_wp_denyhost();
}
}
?>