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 $wgUrlProtocols, $wgMiserMode;
  47
  48                 $this->setHeaders();
  49                 $this->outputHeader();
  50
  51                 $out = $this->getOutput();
  52                 $out->allowClickjacking();
  53
  54                 $request = $this->getRequest();
  55                 $target = $request->getVal( 'target', $par );
  56                 $namespace = $request->getIntorNull( 'namespace', null );
  57
  58                 $protocols_list = array();
  59                 foreach( $wgUrlProtocols as $prot ) {
  60                         if ( $prot !== '//' ) {
  61                                 $protocols_list[] = $prot;
  62                         }
  63                 }
  64
  65                 $target2 = $target;
  66                 $protocol = '';
  67                 $pr_sl = strpos($target2, '//' );
  68                 $pr_cl = strpos($target2, ':' );
  69                 if ( $pr_sl ) {
  70                         // For protocols with '//'
  71                         $protocol = substr( $target2, 0 , $pr_sl+2 );
  72                         $target2 = substr( $target2, $pr_sl+2 );
  73                 } elseif ( !$pr_sl && $pr_cl ) {
  74                         // For protocols without '//' like 'mailto:'
  75                         $protocol = substr( $target2, 0 , $pr_cl+1 );
  76                         $target2 = substr( $target2, $pr_cl+1 );
  77                 } elseif ( $protocol == '' && $target2 != '' ) {
  78                         // default
  79                         $protocol = 'http://';
  80                 }
  81                 if ( $protocol != '' && !in_array( $protocol, $protocols_list ) ) {
  82                         // unsupported protocol, show original search request
  83                         $target2 = $target;
  84                         $protocol = '';
  85                 }
  86
  87                 $out->addWikiMsg( 'linksearch-text', '<nowiki>' . $this->getLanguage()->commaList( $protocols_list ) . '</nowiki>' );
  88                 $s = Xml::openElement( 'form', array( 'id' => 'mw-linksearch-form', 'method' => 'get', 'action' => $GLOBALS['wgScript'] ) ) .
  89                         Html::hidden( 'title', $this->getTitle()->getPrefixedDbKey() ) .
  90                         '<fieldset>' .
  91                         Xml::element( 'legend', array(), wfMsg( 'linksearch' ) ) .
  92                         Xml::inputLabel( wfMsg( 'linksearch-pat' ), 'target', 'target', 50, $target ) . ' ';
  93                 if ( !$wgMiserMode ) {
  94                         $s .= Xml::label( wfMsg( 'linksearch-ns' ), 'namespace' ) . ' ' .
  95                                 Xml::namespaceSelector( $namespace, '' );
  96                 }
  97                 $s .=   Xml::submitButton( wfMsg( 'linksearch-ok' ) ) .
  98                         '</fieldset>' .
  99                         Xml::closeElement( 'form' );
 100                 $out->addHTML( $s );
 101
 102                 if( $target != '' ) {
 103                         $this->setParams( array(
 104                                 'query' => $target2,
 105                                 'namespace' => $namespace,
 106                                 'protocol' => $protocol ) );
 107                         parent::execute( $par );
 108                         if( $this->mMungedQuery === false )
 109                                 $out->addWikiMsg( 'linksearch-error' );
 110                 }
 111         }
 112
 113         /**
 114          * Disable RSS/Atom feeds
 115          */
 116         function isSyndicated() {
 117                 return false;
 118         }
 119
 120         /**
 121          * Return an appropriately formatted LIKE query and the clause
 122          *
 123          * @return array
 124          */
 125         static function mungeQuery( $query, $prot ) {
 126                 $field = 'el_index';
 127                 $rv = LinkFilter::makeLikeArray( $query , $prot );
 128                 if ( $rv === false ) {
 129                         // LinkFilter doesn't handle wildcard in IP, so we'll have to munge here.
 130                         if (preg_match('/^(:?[0-9]{1,3}\.)+\*\s*$|^(:?[0-9]{1,3}\.){3}[0-9]{1,3}:[0-9]*\*\s*$/', $query)) {
 131                                 $dbr = wfGetDB( DB_SLAVE );
 132                                 $rv = array( $prot . rtrim( $query, " \t*" ), $dbr->anyString() );
 133                                 $field = 'el_to';
 134                         }
 135                 }
 136                 return array( $rv, $field );
 137         }
 138
 139         function linkParameters() {
 140                 global $wgMiserMode;
 141                 $params = array();
 142                 $params['target'] = $this->mProt . $this->mQuery;
 143                 if( isset( $this->mNs ) && !$wgMiserMode ) {
 144                         $params['namespace'] = $this->mNs;
 145                 }
 146                 return $params;
 147         }
 148
 149         function getQueryInfo() {
 150                 global $wgMiserMode;
 151                 $dbr = wfGetDB( DB_SLAVE );
 152                 // strip everything past first wildcard, so that
 153                 // index-based-only lookup would be done
 154                 list( $this->mMungedQuery, $clause ) = self::mungeQuery(
 155                                 $this->mQuery, $this->mProt );
 156                 if( $this->mMungedQuery === false )
 157                         // Invalid query; return no results
 158                         return array( 'tables' => 'page', 'fields' => 'page_id', 'conds' => '0=1' );
 159
 160                 $stripped = LinkFilter::keepOneWildcard( $this->mMungedQuery );
 161                 $like = $dbr->buildLike( $stripped );
 162                 $retval = array (
 163                         'tables' => array ( 'page', 'externallinks' ),
 164                         'fields' => array ( 'page_namespace AS namespace',
 165                                         'page_title AS title',
 166                                         'el_index AS value', 'el_to AS url' ),
 167                         'conds' => array ( 'page_id = el_from',
 168                                         "$clause $like" ),
 169                         'options' => array( 'USE INDEX' => $clause )
 170                 );
 171                 if ( isset( $this->mNs ) && !$wgMiserMode ) {
 172                         $retval['conds']['page_namespace'] = $this->mNs;
 173                 }
 174                 return $retval;
 175         }
 176
 177         function formatResult( $skin, $result ) {
 178                 $title = Title::makeTitle( $result->namespace, $result->title );
 179                 $url = $result->url;
 180                 $pageLink = Linker::linkKnown( $title );
 181                 $urlLink = Linker::makeExternalLink( $url, $url );
 182
 183                 return wfMsgHtml( 'linksearch-line', $urlLink, $pageLink );
 184         }
 185
 186         /**
 187          * Override to check query validity.
 188          */
 189         function doQuery( $offset = false, $limit = false ) {
 190                 list( $this->mMungedQuery,  ) = LinkSearchPage::mungeQuery( $this->mQuery, $this->mProt );
 191                 if( $this->mMungedQuery === false ) {
 192                         $this->getOutput()->addWikiMsg( 'linksearch-error' );
 193                 } else {
 194                         // For debugging
 195                         // Generates invalid xhtml with patterns that contain --
 196                         //$this->getOutput()->addHTML( "\n<!-- " . htmlspecialchars( $this->mMungedQuery ) . " -->\n" );
 197                         parent::doQuery( $offset, $limit );
 198                 }
 199         }
 200
 201         /**
 202          * Override to squash the ORDER BY.
 203          * We do a truncated index search, so the optimizer won't trust
 204          * it as good enough for optimizing sort. The implicit ordering
 205          * from the scan will usually do well enough for our needs.
 206          */
 207         function getOrderFields() {
 208                 return array();
 209         }
 210 }