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         /** @var array|bool */
  31         private $mungedQuery = false;
  32
  33         /**
  34          * @var PageLinkRenderer
  35          */
  36         protected $linkRenderer = null;
  37
  38         function setParams( $params ) {
  39                 $this->mQuery = $params['query'];
  40                 $this->mNs = $params['namespace'];
  41                 $this->mProt = $params['protocol'];
  42         }
  43
  44         function __construct( $name = 'LinkSearch' ) {
  45                 parent::__construct( $name );
  46
  47                 // Since we don't control the constructor parameters, we can't inject services that way.
  48                 // Instead, we initialize services in the execute() method, and allow them to be overridden
  49                 // using the setServices() method.
  50         }
  51
  52         /**
  53          * Initialize or override the PageLinkRenderer LinkSearchPage collaborates with.
  54          * Useful mainly for testing.
  55          *
  56          * @todo query logic and rendering logic should be split and also injected
  57          *
  58          * @param PageLinkRenderer $linkRenderer
  59          */
  60         public function setPageLinkRenderer(
  61                 PageLinkRenderer $linkRenderer
  62         ) {
  63                 $this->linkRenderer = $linkRenderer;
  64         }
  65
  66         /**
  67          * Initialize any services we'll need (unless it has already been provided via a setter).
  68          * This allows for dependency injection even though we don't control object creation.
  69          */
  70         private function initServices() {
  71                 global $wgLanguageCode;
  72                 if ( !$this->linkRenderer ) {
  73                         $lang = Language::factory( $wgLanguageCode );
  74                         $titleFormatter = new MediaWikiTitleCodec( $lang, GenderCache::singleton() );
  75                         $this->linkRenderer = new MediaWikiPageLinkRenderer( $titleFormatter );
  76                 }
  77         }
  78
  79         function isCacheable() {
  80                 return false;
  81         }
  82
  83         function execute( $par ) {
  84                 $this->initServices();
  85
  86                 $this->setHeaders();
  87                 $this->outputHeader();
  88
  89                 $out = $this->getOutput();
  90                 $out->allowClickjacking();
  91
  92                 $request = $this->getRequest();
  93                 $target = $request->getVal( 'target', $par );
  94                 $namespace = $request->getIntOrNull( 'namespace', null );
  95
  96                 $protocols_list = array();
  97                 foreach ( $this->getConfig()->get( 'UrlProtocols' ) as $prot ) {
  98                         if ( $prot !== '//' ) {
  99                                 $protocols_list[] = $prot;
 100                         }
 101                 }
 102
 103                 $target2 = $target;
 104                 // Get protocol, default is http://
 105                 $protocol = 'http://';
 106                 $bits = wfParseUrl( $target );
 107                 if ( isset( $bits['scheme'] ) && isset( $bits['delimiter'] ) ) {
 108                         $protocol = $bits['scheme'] . $bits['delimiter'];
 109                         // Make sure wfParseUrl() didn't make some well-intended correction in the
 110                         // protocol
 111                         if ( strcasecmp( $protocol, substr( $target, 0, strlen( $protocol ) ) ) === 0 ) {
 112                                 $target2 = substr( $target, strlen( $protocol ) );
 113                         } else {
 114                                 // If it did, let LinkFilter::makeLikeArray() handle this
 115                                 $protocol = '';
 116                         }
 117                 }
 118
 119                 $out->addWikiMsg(
 120                         'linksearch-text',
 121                         '<nowiki>' . $this->getLanguage()->commaList( $protocols_list ) . '</nowiki>',
 122                         count( $protocols_list )
 123                 );
 124                 $fields = array(
 125                         'target' => array(
 126                                 'type' => 'text',
 127                                 'name' => 'target',
 128                                 'id' => 'target',
 129                                 'size' => 50,
 130                                 'label-message' => 'linksearch-pat',
 131                                 'default' => $target,
 132                                 'dir' => 'ltr',
 133                         )
 134                 );
 135                 if ( !$this->getConfig()->get( 'MiserMode' ) ) {
 136                         $fields += array(
 137                                 'namespace' => array(
 138                                         'class' => 'HTMLSelectNamespace',
 139                                         'name' => 'namespace',
 140                                         'label-message' => 'linksearch-ns',
 141                                         'default' => $namespace,
 142                                         'id' => 'namespace',
 143                                         'cssclass' => 'namespaceselector',
 144                                 ),
 145                         );
 146                 }
 147                 $hiddenFields = array(
 148                         'title' => $this->getPageTitle()->getPrefixedDBkey(),
 149                 );
 150                 $htmlForm = HTMLForm::factory( 'inline', $fields, $this->getContext() );
 151                 $htmlForm->addHiddenFields( $hiddenFields );
 152                 $htmlForm->setSubmitTextMsg( 'linksearch-ok' );
 153                 $htmlForm->setWrapperLegendMsg( 'linksearch' );
 154                 $htmlForm->setAction( wfScript() );
 155                 $htmlForm->setMethod( 'get' );
 156                 $htmlForm->prepareForm()->displayForm( false );
 157
 158                 if ( $target != '' ) {
 159                         $this->setParams( array(
 160                                 'query' => $target2,
 161                                 'namespace' => $namespace,
 162                                 'protocol' => $protocol ) );
 163                         parent::execute( $par );
 164                         if ( $this->mungedQuery === false ) {
 165                                 $out->addWikiMsg( 'linksearch-error' );
 166                         }
 167                 }
 168         }
 169
 170         /**
 171          * Disable RSS/Atom feeds
 172          * @return bool
 173          */
 174         function isSyndicated() {
 175                 return false;
 176         }
 177
 178         /**
 179          * Return an appropriately formatted LIKE query and the clause
 180          *
 181          * @param string $query Search pattern to search for
 182          * @param string $prot Protocol, e.g. 'http://'
 183          *
 184          * @return array
 185          */
 186         static function mungeQuery( $query, $prot ) {
 187                 $field = 'el_index';
 188                 $dbr = wfGetDB( DB_SLAVE );
 189
 190                 if ( $query === '*' && $prot !== '' ) {
 191                         // Allow queries like 'ftp://*' to find all ftp links
 192                         $rv = array( $prot, $dbr->anyString() );
 193                 } else {
 194                         $rv = LinkFilter::makeLikeArray( $query, $prot );
 195                 }
 196
 197                 if ( $rv === false ) {
 198                         // LinkFilter doesn't handle wildcard in IP, so we'll have to munge here.
 199                         $pattern = '/^(:?[0-9]{1,3}\.)+\*\s*$|^(:?[0-9]{1,3}\.){3}[0-9]{1,3}:[0-9]*\*\s*$/';
 200                         if ( preg_match( $pattern, $query ) ) {
 201                                 $rv = array( $prot . rtrim( $query, " \t*" ), $dbr->anyString() );
 202                                 $field = 'el_to';
 203                         }
 204                 }
 205
 206                 return array( $rv, $field );
 207         }
 208
 209         function linkParameters() {
 210                 $params = array();
 211                 $params['target'] = $this->mProt . $this->mQuery;
 212                 if ( $this->mNs !== null && !$this->getConfig()->get( 'MiserMode' ) ) {
 213                         $params['namespace'] = $this->mNs;
 214                 }
 215
 216                 return $params;
 217         }
 218
 219         function getQueryInfo() {
 220                 $dbr = wfGetDB( DB_SLAVE );
 221                 // strip everything past first wildcard, so that
 222                 // index-based-only lookup would be done
 223                 list( $this->mungedQuery, $clause ) = self::mungeQuery( $this->mQuery, $this->mProt );
 224                 if ( $this->mungedQuery === false ) {
 225                         // Invalid query; return no results
 226                         return array( 'tables' => 'page', 'fields' => 'page_id', 'conds' => '0=1' );
 227                 }
 228
 229                 $stripped = LinkFilter::keepOneWildcard( $this->mungedQuery );
 230                 $like = $dbr->buildLike( $stripped );
 231                 $retval = array(
 232                         'tables' => array( 'page', 'externallinks' ),
 233                         'fields' => array(
 234                                 'namespace' => 'page_namespace',
 235                                 'title' => 'page_title',
 236                                 'value' => 'el_index',
 237                                 'url' => 'el_to'
 238                         ),
 239                         'conds' => array(
 240                                 'page_id = el_from',
 241                                 "$clause $like"
 242                         ),
 243                         'options' => array( 'USE INDEX' => $clause )
 244                 );
 245
 246                 if ( $this->mNs !== null && !$this->getConfig()->get( 'MiserMode' ) ) {
 247                         $retval['conds']['page_namespace'] = $this->mNs;
 248                 }
 249
 250                 return $retval;
 251         }
 252
 253         /**
 254          * Pre-fill the link cache
 255          *
 256          * @param IDatabase $db
 257          * @param ResultWrapper $res
 258          */
 259         function preprocessResults( $db, $res ) {
 260                 if ( $res->numRows() > 0 ) {
 261                         $linkBatch = new LinkBatch();
 262
 263                         foreach ( $res as $row ) {
 264                                 $linkBatch->add( $row->namespace, $row->title );
 265                         }
 266
 267                         $res->seek( 0 );
 268                         $linkBatch->execute();
 269                 }
 270         }
 271
 272         /**
 273          * @param Skin $skin
 274          * @param object $result Result row
 275          * @return string
 276          */
 277         function formatResult( $skin, $result ) {
 278                 $title = new TitleValue( (int)$result->namespace, $result->title );
 279                 $pageLink = $this->linkRenderer->renderHtmlLink( $title );
 280
 281                 $url = $result->url;
 282                 $urlLink = Linker::makeExternalLink( $url, $url );
 283
 284                 return $this->msg( 'linksearch-line' )->rawParams( $urlLink, $pageLink )->escaped();
 285         }
 286
 287         /**
 288          * Override to squash the ORDER BY.
 289          * We do a truncated index search, so the optimizer won't trust
 290          * it as good enough for optimizing sort. The implicit ordering
 291          * from the scan will usually do well enough for our needs.
 292          * @return array
 293          */
 294         function getOrderFields() {
 295                 return array();
 296         }
 297
 298         protected function getGroupName() {
 299                 return 'redirects';
 300         }
 301 }