LinkFilter.php

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<?php
class LinkFilter {

        static function matchEntry( Content $content, $filterEntry ) {
                if ( !( $content instanceof TextContent ) ) {
                        //TODO: handle other types of content too.
                        //      Maybe create ContentHandler::matchFilter( LinkFilter ).
                        //      Think about a common base class for LinkFilter and MagicWord.
                        return 0;
                }

                $text = $content->getNativeData();

                $regex = LinkFilter::makeRegex( $filterEntry );
                return preg_match( $regex, $text );
        }

        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;
        }

         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;
        }

        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;
        }
}