includes/specials/SpecialLinkSearch.php

   1 <?php
   2 /**
   3  * Implements Special:LinkSearch
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup SpecialPage
  22  * @author Brion Vibber
  23  */
  24
  25
  26 /**
  27  * Special:LinkSearch to search the external-links table.
  28  */
  29 function wfSpecialLinkSearch( $par ) {
  30
  31         list( $limit, $offset ) = wfCheckLimits();
  32         global $wgOut, $wgUrlProtocols, $wgMiserMode, $wgLang;
  33         $target = $GLOBALS['wgRequest']->getVal( 'target', $par );
  34         $namespace = $GLOBALS['wgRequest']->getIntorNull( 'namespace', null );
  35
  36         $protocols_list[] = '';
  37         foreach( $wgUrlProtocols as $prot ) {
  38                 $protocols_list[] = $prot;
  39         }
  40
  41         $target2 = $target;
  42         $protocol = '';
  43         $pr_sl = strpos($target2, '//' );
  44         $pr_cl = strpos($target2, ':' );
  45         if ( $pr_sl ) {
  46                 // For protocols with '//'
  47                 $protocol = substr( $target2, 0 , $pr_sl+2 );
  48                 $target2 = substr( $target2, $pr_sl+2 );
  49         } elseif ( !$pr_sl && $pr_cl ) {
  50                 // For protocols without '//' like 'mailto:'
  51                 $protocol = substr( $target2, 0 , $pr_cl+1 );
  52                 $target2 = substr( $target2, $pr_cl+1 );
  53         } elseif ( $protocol == '' && $target2 != '' ) {
  54                 // default
  55                 $protocol = 'http://';
  56         }
  57         if ( !in_array( $protocol, $protocols_list ) ) {
  58                 // unsupported protocol, show original search request
  59                 $target2 = $target;
  60                 $protocol = '';
  61         }
  62
  63         $self = Title::makeTitle( NS_SPECIAL, 'Linksearch' );
  64
  65         $wgOut->addWikiMsg( 'linksearch-text', '<nowiki>' . $wgLang->commaList( $wgUrlProtocols ) . '</nowiki>' );
  66         $s =    Xml::openElement( 'form', array( 'id' => 'mw-linksearch-form', 'method' => 'get', 'action' => $GLOBALS['wgScript'] ) ) .
  67                 Xml::hidden( 'title', $self->getPrefixedDbKey() ) .
  68                 '<fieldset>' .
  69                 Xml::element( 'legend', array(), wfMsg( 'linksearch' ) ) .
  70                 Xml::inputLabel( wfMsg( 'linksearch-pat' ), 'target', 'target', 50, $target ) . ' ';
  71         if ( !$wgMiserMode ) {
  72                 $s .= Xml::label( wfMsg( 'linksearch-ns' ), 'namespace' ) . ' ' .
  73                         Xml::namespaceSelector( $namespace, '' );
  74         }
  75         $s .=   Xml::submitButton( wfMsg( 'linksearch-ok' ) ) .
  76                 '</fieldset>' .
  77                 Xml::closeElement( 'form' );
  78         $wgOut->addHTML( $s );
  79
  80         if( $target != '' ) {
  81                 $searcher = new LinkSearchPage;
  82                 $searcher->setParams( array(
  83                         'query' => $target2,
  84                         'namespace' => $namespace,
  85                         'protocol' => $protocol ) );
  86                 $searcher->doQuery( $offset, $limit );
  87         }
  88 }
  89
  90 /**
  91  * @ingroup SpecialPage
  92  */
  93 class LinkSearchPage extends QueryPage {
  94         function setParams( $params ) {
  95                 $this->mQuery = $params['query'];
  96                 $this->mNs = $params['namespace'];
  97                 $this->mProt = $params['protocol'];
  98         }
  99
 100         function getName() {
 101                 return 'LinkSearch';
 102         }
 103
 104         /**
 105          * Disable RSS/Atom feeds
 106          */
 107         function isSyndicated() {
 108                 return false;
 109         }
 110
 111         /**
 112          * Return an appropriately formatted LIKE query and the clause
 113          */
 114         static function mungeQuery( $query , $prot ) {
 115                 $field = 'el_index';
 116                 $rv = LinkFilter::makeLikeArray( $query , $prot );
 117                 if ($rv === false) {
 118                         // LinkFilter doesn't handle wildcard in IP, so we'll have to munge here.
 119                         if (preg_match('/^(:?[0-9]{1,3}\.)+\*\s*$|^(:?[0-9]{1,3}\.){3}[0-9]{1,3}:[0-9]*\*\s*$/', $query)) {
 120                                 $rv = array( $prot . rtrim($query, " \t*"), $dbr->anyString() );
 121                                 $field = 'el_to';
 122                         }
 123                 }
 124                 return array( $rv, $field );
 125         }
 126
 127         function linkParameters() {
 128                 global $wgMiserMode;
 129                 $params = array();
 130                 $params['target'] = $this->mProt . $this->mQuery;
 131                 if( isset( $this->mNs ) && !$wgMiserMode ) {
 132                         $params['namespace'] = $this->mNs;
 133                 }
 134                 return $params;
 135         }
 136
 137         function getSQL() {
 138                 global $wgMiserMode;
 139                 $dbr = wfGetDB( DB_SLAVE );
 140                 $page = $dbr->tableName( 'page' );
 141                 $externallinks = $dbr->tableName( 'externallinks' );
 142
 143                 /* strip everything past first wildcard, so that index-based-only lookup would be done */
 144                 list( $munged, $clause ) = self::mungeQuery( $this->mQuery, $this->mProt );
 145                 $stripped = LinkFilter::keepOneWildcard( $munged );
 146                 $like = $dbr->buildLike( $stripped );
 147
 148                 $encSQL = '';
 149                 if ( isset ($this->mNs) && !$wgMiserMode )
 150                         $encSQL = 'AND page_namespace=' . $dbr->addQuotes( $this->mNs );
 151
 152                 $use_index = $dbr->useIndexClause( $clause );
 153                 return
 154                         "SELECT
 155                                 page_namespace AS namespace,
 156                                 page_title AS title,
 157                                 el_index AS value,
 158                                 el_to AS url
 159                         FROM
 160                                 $page,
 161                                 $externallinks $use_index
 162                         WHERE
 163                                 page_id=el_from
 164                                 AND $clause $like
 165                                 $encSQL";
 166         }
 167
 168         function formatResult( $skin, $result ) {
 169                 $title = Title::makeTitle( $result->namespace, $result->title );
 170                 $url = $result->url;
 171                 $pageLink = $skin->linkKnown( $title );
 172                 $urlLink = $skin->makeExternalLink( $url, $url );
 173
 174                 return wfMsgHtml( 'linksearch-line', $urlLink, $pageLink );
 175         }
 176
 177         /**
 178          * Override to check query validity.
 179          */
 180         function doQuery( $offset, $limit, $shownavigation=true ) {
 181                 global $wgOut;
 182                 list( $this->mMungedQuery, $clause ) = LinkSearchPage::mungeQuery( $this->mQuery, $this->mProt );
 183                 if( $this->mMungedQuery === false ) {
 184                         $wgOut->addWikiMsg( 'linksearch-error' );
 185                 } else {
 186                         // For debugging
 187                         // Generates invalid xhtml with patterns that contain --
 188                         //$wgOut->addHTML( "\n<!-- " . htmlspecialchars( $this->mMungedQuery ) . " -->\n" );
 189                         parent::doQuery( $offset, $limit, $shownavigation );
 190                 }
 191         }
 192
 193         /**
 194          * Override to squash the ORDER BY.
 195          * We do a truncated index search, so the optimizer won't trust
 196          * it as good enough for optimizing sort. The implicit ordering
 197          * from the scan will usually do well enough for our needs.
 198          */
 199         function getOrder() {
 200                 return '';
 201         }
 202 }