stklcode/statify-blacklist
1
0
Fork 0
Code Issues Actions Releases 21 Activity

implement keyword filter for referer blacklist (closes #15)

Browse Source 
In addition to the pre-existing normal and regular expression filters a
keyword mode is added. This filter matches if the referer string
contains a given keyword (case insensitive).
This commit is contained in:
Stefan Kalscheuer
2019-03-12 19:37:22 +01:00
parent 0822537f0e
commit b7c3b51873
5 changed files with 174 additions and 47 deletions
Download Patch File Download Diff File Expand all files Collapse all files

105
inc/class-statifyblacklist.php
View File

@ -28,6 +28,35 @@ class StatifyBlacklist {
*/
const VERSION_MAIN = 1.4;
/**
* Operation mode "normal".
*
* @var integer MODE_NORMAL
*/
const MODE_NORMAL = 0;
/**
* Operation mode "regular expression".
*
* @var integer MODE_REGEX
*/
const MODE_REGEX = 1;
/**
* Operation mode "regular expression case insensitive".
*
* @var integer MODE_REGEX_CI
*/
const MODE_REGEX_CI = 2;
/**
* Operation mode "keyword".
*
* @since 1.5.0
* @var integer MODE_KEYWORD
*/
const MODE_KEYWORD = 3;
/**
* Plugin options.
*
@ -137,35 +166,57 @@ class StatifyBlacklist {
public static function apply_blacklist_filter() {
// Referer blacklist.
if ( isset( self::$_options['referer']['active'] ) && 0 !== self::$_options['referer']['active'] ) {
// Regular Expression filtering since 1.3.0.
if ( isset( self::$_options['referer']['regexp'] ) && self::$_options['referer']['regexp'] > 0 ) {
// Get full referer string.
$referer = wp_get_raw_referer();
if ( ! $referer ) {
$referer = '';
}
// Merge given regular expressions into one.
$regexp = '/' . implode( '|', array_keys( self::$_options['referer']['blacklist'] ) ) . '/';
if ( 2 === self::$_options['referer']['regexp'] ) {
$regexp .= 'i';
}
// Determine filter mode.
$mode = isset( self::$_options['referer']['regexp'] ) ? intval( self::$_options['referer']['regexp'] ) : 0;
// Check blacklist (no return to continue filtering #12).
if ( 1 === preg_match( $regexp, $referer ) ) {
return true;
}
} else {
// Extract relevant domain parts.
$referer = wp_parse_url( wp_get_raw_referer() );
$referer = strtolower( ( isset( $referer['host'] ) ? $referer['host'] : '' ) );
// Get full referer string.
$referer = wp_get_raw_referer();
if ( ! $referer ) {
$referer = '';
}
// Get blacklist.
$blacklist = self::$_options['referer']['blacklist'];
switch ( $mode ) {
// Check blacklist.
if ( isset( $blacklist[ $referer ] ) ) {
return true;
}
// Regular Expression filtering since 1.3.0.
case self::MODE_REGEX:
case self::MODE_REGEX_CI:
// Merge given regular expressions into one.
$regexp = '/' . implode( '|', array_keys( self::$_options['referer']['blacklist'] ) ) . '/';
if ( self::MODE_REGEX_CI === self::$_options['referer']['regexp'] ) {
$regexp .= 'i';
}
// Check blacklist (no return to continue filtering #12).
if ( 1 === preg_match( $regexp, $referer ) ) {
return true;
}
break;
// Keyword filter since 1.5.0 (#15).
case self::MODE_KEYWORD:
// Get blacklist.
$blacklist = self::$_options['referer']['blacklist'];
foreach ( array_keys( $blacklist ) as $keyword ) {
if ( false !== strpos( strtolower( $referer ), strtolower( $keyword ) ) ) {
return true;
}
}
break;
// Standard domain filter.
default:
// Extract relevant domain parts.
$referer = wp_parse_url( $referer );
$referer = strtolower( ( isset( $referer['host'] ) ? $referer['host'] : '' ) );
// Get blacklist.
$blacklist = self::$_options['referer']['blacklist'];
// Check blacklist.
if ( isset( $blacklist[ $referer ] ) ) {
return true;
}
}
}
@ -324,6 +375,6 @@ class StatifyBlacklist {
}
return ( 0 === substr_compare( sprintf( '%032b', ip2long( $ip ) ), sprintf( '%032b', ip2long( $base ) ), 0, $mask ) );
} // End if().
}
}
}