SpecialLinkSearch.php

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<?php
class LinkSearchPage extends QueryPage {
        function setParams( $params ) {
                $this->mQuery = $params['query'];
                $this->mNs = $params['namespace'];
                $this->mProt = $params['protocol'];
        }

        function __construct( $name = 'LinkSearch' ) {
                parent::__construct( $name );
        }

        function isCacheable() {
                return false;
        }

        function execute( $par ) {
                global $wgUrlProtocols, $wgMiserMode, $wgScript;

                $this->setHeaders();
                $this->outputHeader();

                $out = $this->getOutput();
                $out->allowClickjacking();

                $request = $this->getRequest();
                $target = $request->getVal( 'target', $par );
                $namespace = $request->getIntorNull( 'namespace', null );

                $protocols_list = array();
                foreach( $wgUrlProtocols as $prot ) {
                        if ( $prot !== '//' ) {
                                $protocols_list[] = $prot;
                        }
                }

                $target2 = $target;
                $protocol = '';
                $pr_sl = strpos( $target2, '//' );
                $pr_cl = strpos( $target2, ':' );
                if ( $pr_sl ) {
                        // For protocols with '//'
                        $protocol = substr( $target2, 0, $pr_sl + 2 );
                        $target2 = substr( $target2, $pr_sl + 2 );
                } elseif ( !$pr_sl && $pr_cl ) {
                        // For protocols without '//' like 'mailto:'
                        $protocol = substr( $target2, 0, $pr_cl + 1 );
                        $target2 = substr( $target2, $pr_cl+1 );
                } elseif ( $protocol == '' && $target2 != '' ) {
                        // default
                        $protocol = 'http://';
                }
                if ( $protocol != '' && !in_array( $protocol, $protocols_list ) ) {
                        // unsupported protocol, show original search request
                        $target2 = $target;
                        $protocol = '';
                }

                $out->addWikiMsg(
                        'linksearch-text',
                        '<nowiki>' . $this->getLanguage()->commaList( $protocols_list ) . '</nowiki>',
                        count( $protocols_list )
                );
                $s = Html::openElement( 'form', array( 'id' => 'mw-linksearch-form', 'method' => 'get', 'action' => $wgScript ) ) . "\n" .
                        Html::hidden( 'title', $this->getTitle()->getPrefixedDBkey() ) . "\n" .
                        Html::openElement( 'fieldset' ) . "\n" .
                        Html::element( 'legend', array(), $this->msg( 'linksearch' )->text() ) . "\n" .
                        Xml::inputLabel( $this->msg( 'linksearch-pat' )->text(), 'target', 'target', 50, $target ) . "\n";
                if ( !$wgMiserMode ) {
                        $s .= Html::namespaceSelector(
                                array(
                                        'selected' => $namespace,
                                        'all' => '',
                                        'label' => $this->msg( 'linksearch-ns' )->text()
                                ), array(
                                        'name'  => 'namespace',
                                        'id'    => 'namespace',
                                        'class' => 'namespaceselector',
                                )
                        );
                }
                $s .= Xml::submitButton( $this->msg( 'linksearch-ok' )->text() ) . "\n" .
                        Html::closeElement( 'fieldset' ) . "\n" .
                        Html::closeElement( 'form' ) . "\n";
                $out->addHTML( $s );

                if( $target != '' ) {
                        $this->setParams( array(
                                'query' => $target2,
                                'namespace' => $namespace,
                                'protocol' => $protocol ) );
                        parent::execute( $par );
                        if( $this->mMungedQuery === false )
                                $out->addWikiMsg( 'linksearch-error' );
                }
        }

        function isSyndicated() {
                return false;
        }

        static function mungeQuery( $query, $prot ) {
                $field = 'el_index';
                $rv = LinkFilter::makeLikeArray( $query, $prot );
                if ( $rv === false ) {
                        // LinkFilter doesn't handle wildcard in IP, so we'll have to munge here.
                        if ( preg_match( '/^(:?[0-9]{1,3}\.)+\*\s*$|^(:?[0-9]{1,3}\.){3}[0-9]{1,3}:[0-9]*\*\s*$/', $query ) ) {
                                $dbr = wfGetDB( DB_SLAVE );
                                $rv = array( $prot . rtrim( $query, " \t*" ), $dbr->anyString() );
                                $field = 'el_to';
                        }
                }
                return array( $rv, $field );
        }

        function linkParameters() {
                global $wgMiserMode;
                $params = array();
                $params['target'] = $this->mProt . $this->mQuery;
                if( isset( $this->mNs ) && !$wgMiserMode ) {
                        $params['namespace'] = $this->mNs;
                }
                return $params;
        }

        function getQueryInfo() {
                global $wgMiserMode;
                $dbr = wfGetDB( DB_SLAVE );
                // strip everything past first wildcard, so that
                // index-based-only lookup would be done
                list( $this->mMungedQuery, $clause ) = self::mungeQuery(
                                $this->mQuery, $this->mProt );
                if( $this->mMungedQuery === false )
                        // Invalid query; return no results
                        return array( 'tables' => 'page', 'fields' => 'page_id', 'conds' => '0=1' );

                $stripped = LinkFilter::keepOneWildcard( $this->mMungedQuery );
                $like = $dbr->buildLike( $stripped );
                $retval = array (
                        'tables' => array ( 'page', 'externallinks' ),
                        'fields' => array ( 'namespace' => 'page_namespace',
                                        'title' => 'page_title',
                                        'value' => 'el_index', 'url' => 'el_to' ),
                        'conds' => array ( 'page_id = el_from',
                                        "$clause $like" ),
                        'options' => array( 'USE INDEX' => $clause )
                );
                if ( isset( $this->mNs ) && !$wgMiserMode ) {
                        $retval['conds']['page_namespace'] = $this->mNs;
                }
                return $retval;
        }

        function formatResult( $skin, $result ) {
                $title = Title::makeTitle( $result->namespace, $result->title );
                $url = $result->url;
                $pageLink = Linker::linkKnown( $title );
                $urlLink = Linker::makeExternalLink( $url, $url );

                return $this->msg( 'linksearch-line' )->rawParams( $urlLink, $pageLink )->escaped();
        }

        function doQuery( $offset = false, $limit = false ) {
                list( $this->mMungedQuery, ) = LinkSearchPage::mungeQuery( $this->mQuery, $this->mProt );
                if( $this->mMungedQuery === false ) {
                        $this->getOutput()->addWikiMsg( 'linksearch-error' );
                } else {
                        // For debugging
                        // Generates invalid xhtml with patterns that contain --
                        //$this->getOutput()->addHTML( "\n<!-- " . htmlspecialchars( $this->mMungedQuery ) . " -->\n" );
                        parent::doQuery( $offset, $limit );
                }
        }

        function getOrderFields() {
                return array();
        }

        protected function getGroupName() {
                return 'redirects';
        }
}