includes/specials/SpecialLinkSearch.php

   1 <?php
   2 /**
   3  * @file
   4  * @ingroup SpecialPage
   5  *
   6  * @author Brion Vibber
   7  * @license http://www.gnu.org/copyleft/gpl.html GNU General Public License 2.0 or later
   8  */
   9
  10 /**
  11  * Special:LinkSearch to search the external-links table.
  12  */
  13 function wfSpecialLinkSearch( $par ) {
  14
  15         list( $limit, $offset ) = wfCheckLimits();
  16         global $wgOut, $wgRequest, $wgUrlProtocols, $wgMiserMode, $wgLang;
  17         $target = $GLOBALS['wgRequest']->getVal( 'target', $par );
  18         $namespace = $GLOBALS['wgRequest']->getIntorNull( 'namespace', null );
  19
  20         $protocols_list[] = '';
  21         foreach( $wgUrlProtocols as $prot ) {
  22                 $protocols_list[] = $prot;
  23         }
  24
  25         $target2 = $target;
  26         $protocol = '';
  27         $pr_sl = strpos($target2, '//' );
  28         $pr_cl = strpos($target2, ':' );
  29         if ( $pr_sl ) {
  30                 // For protocols with '//'
  31                 $protocol = substr( $target2, 0 , $pr_sl+2 );
  32                 $target2 = substr( $target2, $pr_sl+2 );
  33         } elseif ( !$pr_sl && $pr_cl ) {
  34                 // For protocols without '//' like 'mailto:'
  35                 $protocol = substr( $target2, 0 , $pr_cl+1 );
  36                 $target2 = substr( $target2, $pr_cl+1 );
  37         } elseif ( $protocol == '' && $target2 != '' ) {
  38                 // default
  39                 $protocol = 'http://';
  40         }
  41         if ( !in_array( $protocol, $protocols_list ) ) {
  42                 // unsupported protocol, show original search request
  43                 $target2 = $target;
  44                 $protocol = '';
  45         }
  46
  47         $self = Title::makeTitle( NS_SPECIAL, 'Linksearch' );
  48
  49         $wgOut->addWikiMsg( 'linksearch-text', '<nowiki>' . $wgLang->commaList( $wgUrlProtocols ) . '</nowiki>' );
  50         $s =    Xml::openElement( 'form', array( 'id' => 'mw-linksearch-form', 'method' => 'get', 'action' => $GLOBALS['wgScript'] ) ) .
  51                 Xml::hidden( 'title', $self->getPrefixedDbKey() ) .
  52                 '<fieldset>' .
  53                 Xml::element( 'legend', array(), wfMsg( 'linksearch' ) ) .
  54                 Xml::inputLabel( wfMsg( 'linksearch-pat' ), 'target', 'target', 50, $target ) . ' ';
  55         if ( !$wgMiserMode ) {
  56                 $s .= Xml::label( wfMsg( 'linksearch-ns' ), 'namespace' ) . ' ' .
  57                         XML::namespaceSelector( $namespace, '' );
  58         }
  59         $s .=   Xml::submitButton( wfMsg( 'linksearch-ok' ) ) .
  60                 '</fieldset>' .
  61                 Xml::closeElement( 'form' );
  62         $wgOut->addHTML( $s );
  63
  64         if( $target != '' ) {
  65                 $searcher = new LinkSearchPage;
  66                 $searcher->setParams( array(
  67                         'query' => $target2,
  68                         'namespace' => $namespace,
  69                         'protocol' => $protocol ) );
  70                 $searcher->doQuery( $offset, $limit );
  71         }
  72 }
  73
  74 class LinkSearchPage extends QueryPage {
  75         function setParams( $params ) {
  76                 $this->mQuery = $params['query'];
  77                 $this->mNs = $params['namespace'];
  78                 $this->mProt = $params['protocol'];
  79         }
  80
  81         function getName() {
  82                 return 'LinkSearch';
  83         }
  84
  85         /**
  86          * Disable RSS/Atom feeds
  87          */
  88         function isSyndicated() {
  89                 return false;
  90         }
  91
  92         /**
  93          * Return an appropriately formatted LIKE query and the clause
  94          */
  95         static function mungeQuery( $query , $prot ) {
  96                 $field = 'el_index';
  97                 $rv = LinkFilter::makeLikeArray( $query , $prot );
  98                 if ($rv === false) {
  99                         //makeLike doesn't handle wildcard in IP, so we'll have to munge here.
 100                         if (preg_match('/^(:?[0-9]{1,3}\.)+\*\s*$|^(:?[0-9]{1,3}\.){3}[0-9]{1,3}:[0-9]*\*\s*$/', $query)) {
 101                                 $rv = array( $prot . rtrim($query, " \t*"), $dbr->anyString() );
 102                                 $field = 'el_to';
 103                         }
 104                 }
 105                 return array( $rv, $field );
 106         }
 107
 108         function linkParameters() {
 109                 global $wgMiserMode;
 110                 $params = array();
 111                 $params['target'] = $this->mProt . $this->mQuery;
 112                 if( isset( $this->mNs ) && !$wgMiserMode ) {
 113                         $params['namespace'] = $this->mNs;
 114                 }
 115                 return $params;
 116         }
 117
 118         function getSQL() {
 119                 global $wgMiserMode;
 120                 $dbr = wfGetDB( DB_SLAVE );
 121                 $page = $dbr->tableName( 'page' );
 122                 $externallinks = $dbr->tableName( 'externallinks' );
 123
 124                 /* strip everything past first wildcard, so that index-based-only lookup would be done */
 125                 list( $munged, $clause ) = self::mungeQuery( $this->mQuery, $this->mProt );
 126                 $stripped = LinkFilter::keepOneWildcard( $munged );
 127                 $like = $dbr->buildLike( $stripped );
 128
 129                 $encSQL = '';
 130                 if ( isset ($this->mNs) && !$wgMiserMode )
 131                         $encSQL = 'AND page_namespace=' . $dbr->addQuotes( $this->mNs );
 132
 133                 $use_index = $dbr->useIndexClause( $clause );
 134                 return
 135                         "SELECT
 136                                 page_namespace AS namespace,
 137                                 page_title AS title,
 138                                 el_index AS value,
 139                                 el_to AS url
 140                         FROM
 141                                 $page,
 142                                 $externallinks $use_index
 143                         WHERE
 144                                 page_id=el_from
 145                                 AND $clause $like
 146                                 $encSQL";
 147         }
 148
 149         function formatResult( $skin, $result ) {
 150                 $title = Title::makeTitle( $result->namespace, $result->title );
 151                 $url = $result->url;
 152                 $pageLink = $skin->linkKnown( $title );
 153                 $urlLink = $skin->makeExternalLink( $url, $url );
 154
 155                 return wfMsgHtml( 'linksearch-line', $urlLink, $pageLink );
 156         }
 157
 158         /**
 159          * Override to check query validity.
 160          */
 161         function doQuery( $offset, $limit, $shownavigation=true ) {
 162                 global $wgOut;
 163                 list( $this->mMungedQuery, $clause ) = LinkSearchPage::mungeQuery( $this->mQuery, $this->mProt );
 164                 if( $this->mMungedQuery === false ) {
 165                         $wgOut->addWikiMsg( 'linksearch-error' );
 166                 } else {
 167                         // For debugging
 168                         // Generates invalid xhtml with patterns that contain --
 169                         //$wgOut->addHTML( "\n<!-- " . htmlspecialchars( $this->mMungedQuery ) . " -->\n" );
 170                         parent::doQuery( $offset, $limit, $shownavigation );
 171                 }
 172         }
 173
 174         /**
 175          * Override to squash the ORDER BY.
 176          * We do a truncated index search, so the optimizer won't trust
 177          * it as good enough for optimizing sort. The implicit ordering
 178          * from the scan will usually do well enough for our needs.
 179          */
 180         function getOrder() {
 181                 return '';
 182         }
 183 }