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  * @ingroup SpecialPage
  29  */
  30 class LinkSearchPage extends QueryPage {
  31         function setParams( $params ) {
  32                 $this->mQuery = $params['query'];
  33                 $this->mNs = $params['namespace'];
  34                 $this->mProt = $params['protocol'];
  35         }
  36
  37         function __construct( $name = 'LinkSearch' ) {
  38                 parent::__construct( $name );
  39         }
  40
  41         function isCacheable() {
  42                 return false;
  43         }
  44
  45         function execute( $par ) {
  46                 global $wgOut, $wgRequest, $wgUrlProtocols, $wgMiserMode, $wgLang, $wgScript;
  47                 $this->setHeaders();
  48
  49                 $target = $wgRequest->getVal( 'target', $par );
  50                 $namespace = $wgRequest->getIntorNull( 'namespace', null );
  51
  52                 $protocols_list[] = '';
  53                 foreach( $wgUrlProtocols as $prot ) {
  54                         $protocols_list[] = $prot;
  55                 }
  56
  57                 $target2 = $target;
  58                 $protocol = '';
  59                 $pr_sl = strpos($target2, '//' );
  60                 $pr_cl = strpos($target2, ':' );
  61                 if ( $pr_sl ) {
  62                         // For protocols with '//'
  63                         $protocol = substr( $target2, 0 , $pr_sl+2 );
  64                         $target2 = substr( $target2, $pr_sl+2 );
  65                 } elseif ( !$pr_sl && $pr_cl ) {
  66                         // For protocols without '//' like 'mailto:'
  67                         $protocol = substr( $target2, 0 , $pr_cl+1 );
  68                         $target2 = substr( $target2, $pr_cl+1 );
  69                 } elseif ( $protocol == '' && $target2 != '' ) {
  70                         // default
  71                         $protocol = 'http://';
  72                 }
  73                 if ( !in_array( $protocol, $protocols_list ) ) {
  74                         // unsupported protocol, show original search request
  75                         $target2 = $target;
  76                         $protocol = '';
  77                 }
  78
  79                 $self = $this->getTitle();
  80
  81                 $wgOut->addWikiMsg( 'linksearch-text', '<nowiki>' . $wgLang->commaList( $wgUrlProtocols ) . '</nowiki>' );
  82                 $s = Xml::openElement( 'form', array( 'id' => 'mw-linksearch-form', 'method' => 'get', 'action' => $GLOBALS['wgScript'] ) ) .
  83                         Html::hidden( 'title', $self->getPrefixedDbKey() ) .
  84                         '<fieldset>' .
  85                         Xml::element( 'legend', array(), wfMsg( 'linksearch' ) ) .
  86                         Xml::inputLabel( wfMsg( 'linksearch-pat' ), 'target', 'target', 50, $target ) . ' ';
  87                 if ( !$wgMiserMode ) {
  88                         $s .= Xml::label( wfMsg( 'linksearch-ns' ), 'namespace' ) . ' ' .
  89                                 Xml::namespaceSelector( $namespace, '' );
  90                 }
  91                 $s .=   Xml::submitButton( wfMsg( 'linksearch-ok' ) ) .
  92                         '</fieldset>' .
  93                         Xml::closeElement( 'form' );
  94                 $wgOut->addHTML( $s );
  95
  96                 if( $target != '' ) {
  97                         $this->setParams( array(
  98                                 'query' => $target2,
  99                                 'namespace' => $namespace,
 100                                 'protocol' => $protocol ) );
 101                         parent::execute( $par );
 102                         if( $this->mMungedQuery === false )
 103                                 $wgOut->addWikiText( wfMsg( 'linksearch-error' ) );
 104                 }
 105         }
 106
 107         /**
 108          * Disable RSS/Atom feeds
 109          */
 110         function isSyndicated() {
 111                 return false;
 112         }
 113
 114         /**
 115          * Return an appropriately formatted LIKE query and the clause
 116          */
 117         static function mungeQuery( $query, $prot ) {
 118                 $field = 'el_index';
 119                 $rv = LinkFilter::makeLikeArray( $query , $prot );
 120                 if ( $rv === false ) {
 121                         // LinkFilter doesn't handle wildcard in IP, so we'll have to munge here.
 122                         if (preg_match('/^(:?[0-9]{1,3}\.)+\*\s*$|^(:?[0-9]{1,3}\.){3}[0-9]{1,3}:[0-9]*\*\s*$/', $query)) {
 123                                 $dbr = wfGetDB( DB_SLAVE );
 124                                 $rv = array( $prot . rtrim( $query, " \t*" ), $dbr->anyString() );
 125                                 $field = 'el_to';
 126                         }
 127                 }
 128                 return array( $rv, $field );
 129         }
 130
 131         function linkParameters() {
 132                 global $wgMiserMode;
 133                 $params = array();
 134                 $params['target'] = $this->mProt . $this->mQuery;
 135                 if( isset( $this->mNs ) && !$wgMiserMode ) {
 136                         $params['namespace'] = $this->mNs;
 137                 }
 138                 return $params;
 139         }
 140
 141         function getQueryInfo() {
 142                 global $wgMiserMode;
 143                 $dbr = wfGetDB( DB_SLAVE );
 144                 // strip everything past first wildcard, so that
 145                 // index-based-only lookup would be done
 146                 list( $this->mMungedQuery, $clause ) = self::mungeQuery(
 147                                 $this->mQuery, $this->mProt );
 148                 if( $this->mMungedQuery === false )
 149                         // Invalid query; return no results
 150                         return array( 'tables' => 'page', 'fields' => 'page_id', 'conds' => '0=1' );
 151
 152                 $stripped = LinkFilter::keepOneWildcard( $this->mMungedQuery );
 153                 $like = $dbr->buildLike( $stripped );
 154                 $retval = array (
 155                         'tables' => array ( 'page', 'externallinks' ),
 156                         'fields' => array ( 'page_namespace AS namespace',
 157                                         'page_title AS title',
 158                                         'el_index AS value', 'el_to AS url' ),
 159                         'conds' => array ( 'page_id = el_from',
 160                                         "$clause $like" ),
 161                         'options' => array( 'USE INDEX' => $clause )
 162                 );
 163                 if ( isset( $this->mNs ) && !$wgMiserMode ) {
 164                         $retval['conds']['page_namespace'] = $this->mNs;
 165                 }
 166                 return $retval;
 167         }
 168
 169         function formatResult( $skin, $result ) {
 170                 $title = Title::makeTitle( $result->namespace, $result->title );
 171                 $url = $result->url;
 172                 $pageLink = $skin->linkKnown( $title );
 173                 $urlLink = $skin->makeExternalLink( $url, $url );
 174
 175                 return wfMsgHtml( 'linksearch-line', $urlLink, $pageLink );
 176         }
 177
 178         /**
 179          * Override to check query validity.
 180          */
 181         function doQuery( $limit, $offset = false ) {
 182                 global $wgOut;
 183                 list( $this->mMungedQuery,  ) = LinkSearchPage::mungeQuery( $this->mQuery, $this->mProt );
 184                 if( $this->mMungedQuery === false ) {
 185                         $wgOut->addWikiMsg( 'linksearch-error' );
 186                 } else {
 187                         // For debugging
 188                         // Generates invalid xhtml with patterns that contain --
 189                         //$wgOut->addHTML( "\n<!-- " . htmlspecialchars( $this->mMungedQuery ) . " -->\n" );
 190                         parent::doQuery( $limit, $offset );
 191                 }
 192         }
 193
 194         /**
 195          * Override to squash the ORDER BY.
 196          * We do a truncated index search, so the optimizer won't trust
 197          * it as good enough for optimizing sort. The implicit ordering
 198          * from the scan will usually do well enough for our needs.
 199          */
 200         function getOrderFields() {
 201                 return array();
 202         }
 203 }