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  * Special:LinkSearch to search the external-links table.
  27  * @ingroup SpecialPage
  28  */
  29 class LinkSearchPage extends QueryPage {
  30         function setParams( $params ) {
  31                 $this->mQuery = $params['query'];
  32                 $this->mNs = $params['namespace'];
  33                 $this->mProt = $params['protocol'];
  34         }
  35
  36         function __construct( $name = 'LinkSearch' ) {
  37                 parent::__construct( $name );
  38         }
  39
  40         function isCacheable() {
  41                 return false;
  42         }
  43
  44         function execute( $par ) {
  45                 global $wgUrlProtocols, $wgMiserMode, $wgScript;
  46
  47                 $this->setHeaders();
  48                 $this->outputHeader();
  49
  50                 $out = $this->getOutput();
  51                 $out->allowClickjacking();
  52
  53                 $request = $this->getRequest();
  54                 $target = $request->getVal( 'target', $par );
  55                 $namespace = $request->getIntorNull( 'namespace', null );
  56
  57                 $protocols_list = array();
  58                 foreach ( $wgUrlProtocols as $prot ) {
  59                         if ( $prot !== '//' ) {
  60                                 $protocols_list[] = $prot;
  61                         }
  62                 }
  63
  64                 $target2 = $target;
  65                 $protocol = '';
  66                 $pr_sl = strpos( $target2, '//' );
  67                 $pr_cl = strpos( $target2, ':' );
  68                 if ( $pr_sl ) {
  69                         // For protocols with '//'
  70                         $protocol = substr( $target2, 0, $pr_sl + 2 );
  71                         $target2 = substr( $target2, $pr_sl + 2 );
  72                 } elseif ( !$pr_sl && $pr_cl ) {
  73                         // For protocols without '//' like 'mailto:'
  74                         $protocol = substr( $target2, 0, $pr_cl + 1 );
  75                         $target2 = substr( $target2, $pr_cl + 1 );
  76                 } elseif ( $protocol == '' && $target2 != '' ) {
  77                         // default
  78                         $protocol = 'http://';
  79                 }
  80                 if ( $protocol != '' && !in_array( $protocol, $protocols_list ) ) {
  81                         // unsupported protocol, show original search request
  82                         $target2 = $target;
  83                         $protocol = '';
  84                 }
  85
  86                 $out->addWikiMsg(
  87                         'linksearch-text',
  88                         '<nowiki>' . $this->getLanguage()->commaList( $protocols_list ) . '</nowiki>',
  89                         count( $protocols_list )
  90                 );
  91                 $s = Html::openElement( 'form', array( 'id' => 'mw-linksearch-form', 'method' => 'get', 'action' => $wgScript ) ) . "\n" .
  92                         Html::hidden( 'title', $this->getTitle()->getPrefixedDBkey() ) . "\n" .
  93                         Html::openElement( 'fieldset' ) . "\n" .
  94                         Html::element( 'legend', array(), $this->msg( 'linksearch' )->text() ) . "\n" .
  95                         Xml::inputLabel( $this->msg( 'linksearch-pat' )->text(), 'target', 'target', 50, $target ) . "\n";
  96                 if ( !$wgMiserMode ) {
  97                         $s .= Html::namespaceSelector(
  98                                 array(
  99                                         'selected' => $namespace,
 100                                         'all' => '',
 101                                         'label' => $this->msg( 'linksearch-ns' )->text()
 102                                 ), array(
 103                                         'name' => 'namespace',
 104                                         'id' => 'namespace',
 105                                         'class' => 'namespaceselector',
 106                                 )
 107                         );
 108                 }
 109                 $s .= Xml::submitButton( $this->msg( 'linksearch-ok' )->text() ) . "\n" .
 110                         Html::closeElement( 'fieldset' ) . "\n" .
 111                         Html::closeElement( 'form' ) . "\n";
 112                 $out->addHTML( $s );
 113
 114                 if ( $target != '' ) {
 115                         $this->setParams( array(
 116                                 'query' => $target2,
 117                                 'namespace' => $namespace,
 118                                 'protocol' => $protocol ) );
 119                         parent::execute( $par );
 120                         if ( $this->mMungedQuery === false ) {
 121                                 $out->addWikiMsg( 'linksearch-error' );
 122                         }
 123                 }
 124         }
 125
 126         /**
 127          * Disable RSS/Atom feeds
 128          * @return bool
 129          */
 130         function isSyndicated() {
 131                 return false;
 132         }
 133
 134         /**
 135          * Return an appropriately formatted LIKE query and the clause
 136          *
 137          * @param string $query
 138          * @param string $prot
 139          * @return array
 140          */
 141         static function mungeQuery( $query, $prot ) {
 142                 $field = 'el_index';
 143                 $rv = LinkFilter::makeLikeArray( $query, $prot );
 144                 if ( $rv === false ) {
 145                         // LinkFilter doesn't handle wildcard in IP, so we'll have to munge here.
 146                         if ( preg_match( '/^(:?[0-9]{1,3}\.)+\*\s*$|^(:?[0-9]{1,3}\.){3}[0-9]{1,3}:[0-9]*\*\s*$/', $query ) ) {
 147                                 $dbr = wfGetDB( DB_SLAVE );
 148                                 $rv = array( $prot . rtrim( $query, " \t*" ), $dbr->anyString() );
 149                                 $field = 'el_to';
 150                         }
 151                 }
 152                 return array( $rv, $field );
 153         }
 154
 155         function linkParameters() {
 156                 global $wgMiserMode;
 157                 $params = array();
 158                 $params['target'] = $this->mProt . $this->mQuery;
 159                 if ( isset( $this->mNs ) && !$wgMiserMode ) {
 160                         $params['namespace'] = $this->mNs;
 161                 }
 162                 return $params;
 163         }
 164
 165         function getQueryInfo() {
 166                 global $wgMiserMode;
 167                 $dbr = wfGetDB( DB_SLAVE );
 168                 // strip everything past first wildcard, so that
 169                 // index-based-only lookup would be done
 170                 list( $this->mMungedQuery, $clause ) = self::mungeQuery(
 171                                 $this->mQuery, $this->mProt );
 172                 if ( $this->mMungedQuery === false ) {
 173                         // Invalid query; return no results
 174                         return array( 'tables' => 'page', 'fields' => 'page_id', 'conds' => '0=1' );
 175                 }
 176
 177                 $stripped = LinkFilter::keepOneWildcard( $this->mMungedQuery );
 178                 $like = $dbr->buildLike( $stripped );
 179                 $retval = array(
 180                         'tables' => array( 'page', 'externallinks' ),
 181                         'fields' => array( 'namespace' => 'page_namespace',
 182                                         'title' => 'page_title',
 183                                         'value' => 'el_index', 'url' => 'el_to' ),
 184                         'conds' => array( 'page_id = el_from',
 185                                         "$clause $like" ),
 186                         'options' => array( 'USE INDEX' => $clause )
 187                 );
 188                 if ( isset( $this->mNs ) && !$wgMiserMode ) {
 189                         $retval['conds']['page_namespace'] = $this->mNs;
 190                 }
 191                 return $retval;
 192         }
 193
 194         /**
 195          * @param Skin $skin
 196          * @param object $result Result row
 197          * @return string
 198          */
 199         function formatResult( $skin, $result ) {
 200                 $title = Title::makeTitle( $result->namespace, $result->title );
 201                 $url = $result->url;
 202                 $pageLink = Linker::linkKnown( $title );
 203                 $urlLink = Linker::makeExternalLink( $url, $url );
 204
 205                 return $this->msg( 'linksearch-line' )->rawParams( $urlLink, $pageLink )->escaped();
 206         }
 207
 208         /**
 209          * Override to check query validity.
 210          */
 211         function doQuery( $offset = false, $limit = false ) {
 212                 list( $this->mMungedQuery, ) = LinkSearchPage::mungeQuery( $this->mQuery, $this->mProt );
 213                 if ( $this->mMungedQuery === false ) {
 214                         $this->getOutput()->addWikiMsg( 'linksearch-error' );
 215                 } else {
 216                         // For debugging
 217                         // Generates invalid xhtml with patterns that contain --
 218                         //$this->getOutput()->addHTML( "\n<!-- " . htmlspecialchars( $this->mMungedQuery ) . " -->\n" );
 219                         parent::doQuery( $offset, $limit );
 220                 }
 221         }
 222
 223         /**
 224          * Override to squash the ORDER BY.
 225          * We do a truncated index search, so the optimizer won't trust
 226          * it as good enough for optimizing sort. The implicit ordering
 227          * from the scan will usually do well enough for our needs.
 228          * @return array
 229          */
 230         function getOrderFields() {
 231                 return array();
 232         }
 233
 234         protected function getGroupName() {
 235                 return 'redirects';
 236         }
 237 }