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<?php
/**
* Some functions to help implement an external link filter for spam control.
*
* @todo implement the filter. Currently these are just some functions to help
* maintenance/cleanupSpam.php remove links to a single specified domain. The
* next thing is to implement functions for checking a given page against a big
* list of domains.
*
* Another cool thing to do would be a web interface for fast spam removal.
*/
class LinkFilter {
/**
* Check whether $text contains a link to $filterEntry
*
* @param $text String: text to check
* @param $filterEntry String: domainparts, see makeRegex() for more details
* @return Integer: 0 if no match or 1 if there's at least one match
*/
static function matchEntry( $text, $filterEntry ) {
$regex = LinkFilter::makeRegex( $filterEntry );
return preg_match( $regex, $text );
}
/**
* Builds a regex pattern for $filterEntry.
*
* @param $filterEntry String: URL, if it begins with "*.", it'll be
* replaced to match any subdomain
* @return String: regex pattern, for preg_match()
*/
private static function makeRegex( $filterEntry ) {
$regex = '!http://';
if ( substr( $filterEntry, 0, 2 ) == '*.' ) {
$regex .= '(?:[A-Za-z0-9.-]+\.|)';
$filterEntry = substr( $filterEntry, 2 );
}
$regex .= preg_quote( $filterEntry, '!' ) . '!Si';
return $regex;
}
/**
* Make an array to be used for calls to DatabaseBase::buildLike(), which
* will match the specified string. There are several kinds of filter entry:
* *.domain.com - Produces http://com.domain.%, matches domain.com
* and www.domain.com
* domain.com - Produces http://com.domain./%, matches domain.com
* or domain.com/ but not www.domain.com
* *.domain.com/x - Produces http://com.domain.%/x%, matches
* www.domain.com/xy
* domain.com/x - Produces http://com.domain./x%, matches
* domain.com/xy but not www.domain.com/xy
*
* Asterisks in any other location are considered invalid.
*
* @param $filterEntry String: domainparts
* @param $prot String: protocol
* @return Array to be passed to DatabaseBase::buildLike() or false on error
*/
public static function makeLikeArray( $filterEntry , $prot = 'http://' ) {
$db = wfGetDB( DB_MASTER );
if ( substr( $filterEntry, 0, 2 ) == '*.' ) {
$subdomains = true;
$filterEntry = substr( $filterEntry, 2 );
if ( $filterEntry == '' ) {
// We don't want to make a clause that will match everything,
// that could be dangerous
return false;
}
} else {
$subdomains = false;
}
// No stray asterisks, that could cause confusion
// It's not simple or efficient to handle it properly so we don't
// handle it at all.
if ( strpos( $filterEntry, '*' ) !== false ) {
return false;
}
$slash = strpos( $filterEntry, '/' );
if ( $slash !== false ) {
$path = substr( $filterEntry, $slash );
$host = substr( $filterEntry, 0, $slash );
} else {
$path = '/';
$host = $filterEntry;
}
// Reverse the labels in the hostname, convert to lower case
// For emails reverse domainpart only
if ( $prot == 'mailto:' && strpos($host, '@') ) {
// complete email adress
$mailparts = explode( '@', $host );
$domainpart = strtolower( implode( '.', array_reverse( explode( '.', $mailparts[1] ) ) ) );
$host = $domainpart . '@' . $mailparts[0];
$like = array( "$prot$host", $db->anyString() );
} elseif ( $prot == 'mailto:' ) {
// domainpart of email adress only. do not add '.'
$host = strtolower( implode( '.', array_reverse( explode( '.', $host ) ) ) );
$like = array( "$prot$host", $db->anyString() );
} else {
$host = strtolower( implode( '.', array_reverse( explode( '.', $host ) ) ) );
if ( substr( $host, -1, 1 ) !== '.' ) {
$host .= '.';
}
$like = array( "$prot$host" );
if ( $subdomains ) {
$like[] = $db->anyString();
}
if ( !$subdomains || $path !== '/' ) {
$like[] = $path;
$like[] = $db->anyString();
}
}
return $like;
}
/**
* Filters an array returned by makeLikeArray(), removing everything past first pattern placeholder.
*
* @param $arr array: array to filter
* @return filtered array
*/
public static function keepOneWildcard( $arr ) {
if( !is_array( $arr ) ) {
return $arr;
}
foreach( $arr as $key => $value ) {
if ( $value instanceof LikeMatch ) {
return array_slice( $arr, 0, $key + 1 );
}
}
return $arr;
}
}
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