includes/QueryPage.php

   1 <?php
   2 /**
   3  * Contain a class for special pages
   4  * @package MediaWiki
   5  */
   6
   7 /**
   8  *
   9  */
  10 require_once 'Feed.php';
  11
  12 /**
  13  * List of query page classes and their associated special pages, for periodic update purposes
  14  */
  15 global $wgQueryPages; // not redundant
  16 $wgQueryPages = array(
  17 //         QueryPage subclass           Special page name         Limit (false for none, none for the default)
  18 //----------------------------------------------------------------------------
  19         array( 'AncientPagesPage',              'Ancientpages'                  ),
  20         array( 'BrokenRedirectsPage',           'BrokenRedirects'               ),
  21         array( 'CategoriesPage',                'Categories'                    ),
  22         array( 'DeadendPagesPage',              'Deadendpages'                  ),
  23         array( 'DisambiguationsPage',           'Disambiguations'               ),
  24         array( 'DoubleRedirectsPage',           'DoubleRedirects'               ),
  25         array( 'ListUsersPage',                 'Listusers'                     ),
  26         array( 'ListredirectsPage', 'Listredirects' ),
  27         array( 'LonelyPagesPage',               'Lonelypages'                   ),
  28         array( 'LongPagesPage',                 'Longpages'                     ),
  29         array( 'MostcategoriesPage',            'Mostcategories'                ),
  30         array( 'MostimagesPage',                'Mostimages'                    ),
  31         array( 'MostlinkedCategoriesPage',      'Mostlinkedcategories'          ),
  32         array( 'MostlinkedPage',                'Mostlinked'                    ),
  33         array( 'MostrevisionsPage',             'Mostrevisions'                 ),
  34         array( 'NewPagesPage',                  'Newpages'                      ),
  35         array( 'ShortPagesPage',                'Shortpages'                    ),
  36         array( 'UncategorizedCategoriesPage',   'Uncategorizedcategories'       ),
  37         array( 'UncategorizedPagesPage',        'Uncategorizedpages'            ),
  38         array( 'UnusedCategoriesPage',          'Unusedcategories'              ),
  39         array( 'UnusedimagesPage',              'Unusedimages'                  ),
  40         array( 'WantedCategoriesPage',          'Wantedcategories'              ),
  41         array( 'WantedPagesPage',               'Wantedpages'                   ),
  42         array( 'UnwatchedPagesPage',            'Unwatchedpages'                ),
  43 );
  44 wfRunHooks( 'wgQueryPages', array( &$wgQueryPages ) );
  45
  46 global $wgDisableCounters;
  47 if ( !$wgDisableCounters )
  48         $wgQueryPages[] = array( 'PopularPagesPage',            'Popularpages'          );
  49
  50
  51 /**
  52  * This is a class for doing query pages; since they're almost all the same,
  53  * we factor out some of the functionality into a superclass, and let
  54  * subclasses derive from it.
  55  *
  56  * @package MediaWiki
  57  */
  58 class QueryPage {
  59         /**
  60          * Whether or not we want plain listoutput rather than an ordered list
  61          *
  62          * @var bool
  63          */
  64         var $listoutput = false;
  65
  66         /**
  67          * A mutator for $this->listoutput;
  68          *
  69          * @param bool $bool
  70          */
  71         function setListoutput( $bool ) {
  72                 $this->listoutput = $bool;
  73         }
  74
  75         /**
  76          * Subclasses return their name here. Make sure the name is also
  77          * specified in SpecialPage.php and in Language.php as a language message
  78          * param.
  79          */
  80         function getName() {
  81                 return '';
  82         }
  83
  84         /**
  85          * Subclasses return an SQL query here.
  86          *
  87          * Note that the query itself should return the following four columns:
  88          * 'type' (your special page's name), 'namespace', 'title', and 'value'
  89          * *in that order*. 'value' is used for sorting.
  90          *
  91          * These may be stored in the querycache table for expensive queries,
  92          * and that cached data will be returned sometimes, so the presence of
  93          * extra fields can't be relied upon. The cached 'value' column will be
  94          * an integer; non-numeric values are useful only for sorting the initial
  95          * query.
  96          *
  97          * Don't include an ORDER or LIMIT clause, this will be added.
  98          */
  99         function getSQL() {
 100                 return "SELECT 'sample' as type, 0 as namespace, 'Sample result' as title, 42 as value";
 101         }
 102
 103         /**
 104          * Override to sort by increasing values
 105          */
 106         function sortDescending() {
 107                 return true;
 108         }
 109
 110         function getOrder() {
 111                 return ' ORDER BY value ' .
 112                         ($this->sortDescending() ? 'DESC' : '');
 113         }
 114
 115         /**
 116          * Is this query expensive (for some definition of expensive)? Then we
 117          * don't let it run in miser mode. $wgDisableQueryPages causes all query
 118          * pages to be declared expensive. Some query pages are always expensive.
 119          */
 120         function isExpensive( ) {
 121                 global $wgDisableQueryPages;
 122                 return $wgDisableQueryPages;
 123         }
 124
 125         /**
 126          * Whether or not the output of the page in question is retrived from
 127          * the database cache.
 128          *
 129          * @return bool
 130          */
 131         function isCached() {
 132                 global $wgMiserMode;
 133
 134                 return $this->isExpensive() && $wgMiserMode;
 135         }
 136
 137         /**
 138          * Sometime we dont want to build rss / atom feeds.
 139          */
 140         function isSyndicated() {
 141                 return true;
 142         }
 143
 144         /**
 145          * Formats the results of the query for display. The skin is the current
 146          * skin; you can use it for making links. The result is a single row of
 147          * result data. You should be able to grab SQL results off of it.
 148          * If the function return "false", the line output will be skipped.
 149          */
 150         function formatResult( $skin, $result ) {
 151                 return '';
 152         }
 153
 154         /**
 155          * The content returned by this function will be output before any result
 156          */
 157         function getPageHeader( ) {
 158                 return '';
 159         }
 160
 161         /**
 162          * If using extra form wheely-dealies, return a set of parameters here
 163          * as an associative array. They will be encoded and added to the paging
 164          * links (prev/next/lengths).
 165          * @return array
 166          */
 167         function linkParameters() {
 168                 return array();
 169         }
 170
 171         /**
 172          * Some special pages (for example SpecialListusers) might not return the
 173          * current object formatted, but return the previous one instead.
 174          * Setting this to return true, will call one more time wfFormatResult to
 175          * be sure that the very last result is formatted and shown.
 176          */
 177         function tryLastResult( ) {
 178                 return false;
 179         }
 180
 181         /**
 182          * Clear the cache and save new results
 183          */
 184         function recache( $limit, $ignoreErrors = true ) {
 185                 $fname = get_class($this) . '::recache';
 186                 $dbw =& wfGetDB( DB_MASTER );
 187                 $dbr =& wfGetDB( DB_SLAVE, array( $this->getName(), 'QueryPage::recache', 'vslow' ) );
 188                 if ( !$dbw || !$dbr ) {
 189                         return false;
 190                 }
 191
 192                 $querycache = $dbr->tableName( 'querycache' );
 193
 194                 if ( $ignoreErrors ) {
 195                         $ignoreW = $dbw->ignoreErrors( true );
 196                         $ignoreR = $dbr->ignoreErrors( true );
 197                 }
 198
 199                 # Clear out any old cached data
 200                 $dbw->delete( 'querycache', array( 'qc_type' => $this->getName() ), $fname );
 201                 # Do query
 202                 $sql = $this->getSQL() . $this->getOrder();
 203                 if ($limit !== false)
 204                         $sql = $dbr->limitResult($sql, $limit, 0);
 205                 $res = $dbr->query($sql, $fname);
 206                 $num = false;
 207                 if ( $res ) {
 208                         $num = $dbr->numRows( $res );
 209                         # Fetch results
 210                         $insertSql = "INSERT INTO $querycache (qc_type,qc_namespace,qc_title,qc_value) VALUES ";
 211                         $first = true;
 212                         while ( $res && $row = $dbr->fetchObject( $res ) ) {
 213                                 if ( $first ) {
 214                                         $first = false;
 215                                 } else {
 216                                         $insertSql .= ',';
 217                                 }
 218                                 if ( isset( $row->value ) ) {
 219                                         $value = $row->value;
 220                                 } else {
 221                                         $value = '';
 222                                 }
 223
 224                                 $insertSql .= '(' .
 225                                         $dbw->addQuotes( $row->type ) . ',' .
 226                                         $dbw->addQuotes( $row->namespace ) . ',' .
 227                                         $dbw->addQuotes( $row->title ) . ',' .
 228                                         $dbw->addQuotes( $value ) . ')';
 229                         }
 230
 231                         # Save results into the querycache table on the master
 232                         if ( !$first ) {
 233                                 if ( !$dbw->query( $insertSql, $fname ) ) {
 234                                         // Set result to false to indicate error
 235                                         $dbr->freeResult( $res );
 236                                         $res = false;
 237                                 }
 238                         }
 239                         if ( $res ) {
 240                                 $dbr->freeResult( $res );
 241                         }
 242                         if ( $ignoreErrors ) {
 243                                 $dbw->ignoreErrors( $ignoreW );
 244                                 $dbr->ignoreErrors( $ignoreR );
 245                         }
 246                 }
 247                 return $num;
 248         }
 249
 250         /**
 251          * This is the actual workhorse. It does everything needed to make a
 252          * real, honest-to-gosh query page.
 253          *
 254          * @param $offset database query offset
 255          * @param $limit database query limit
 256          * @param $shownavigation show navigation like "next 200"?
 257          */
 258         function doQuery( $offset, $limit, $shownavigation=true ) {
 259                 global $wgUser, $wgOut, $wgContLang;
 260
 261                 $sname = $this->getName();
 262                 $fname = get_class($this) . '::doQuery';
 263                 $sql = $this->getSQL();
 264                 $dbr =& wfGetDB( DB_SLAVE );
 265                 $querycache = $dbr->tableName( 'querycache' );
 266
 267                 $wgOut->setSyndicated( $this->isSyndicated() );
 268
 269                 if ( $this->isCached() ) {
 270                         $type = $dbr->strencode( $sname );
 271                         $sql =
 272                                 "SELECT qc_type as type, qc_namespace as namespace,qc_title as title, qc_value as value
 273                                  FROM $querycache WHERE qc_type='$type'";
 274                         if ( ! $this->listoutput )
 275                                 $wgOut->addWikiText( wfMsg( 'perfcached' ) );
 276                 }
 277
 278                 $sql .= $this->getOrder();
 279                 $sql = $dbr->limitResult($sql, $limit, $offset);
 280                 $res = $dbr->query( $sql );
 281                 $num = $dbr->numRows($res);
 282
 283                 $this->preprocessResults( $dbr, $res );
 284
 285                 $sk = $wgUser->getSkin( );
 286
 287                 if($shownavigation) {
 288                         $wgOut->addHTML( $this->getPageHeader() );
 289                         $top = wfShowingResults( $offset, $num);
 290                         $wgOut->addHTML( "<p>{$top}\n" );
 291
 292                         # often disable 'next' link when we reach the end
 293                         $atend = $num < $limit;
 294
 295                         $sl = wfViewPrevNext( $offset, $limit ,
 296                                 $wgContLang->specialPage( $sname ),
 297                                 wfArrayToCGI( $this->linkParameters() ), $atend );
 298                         $wgOut->addHTML( "<br />{$sl}</p>\n" );
 299                 }
 300                 if ( $num > 0 ) {
 301                         $s = array();
 302                         if ( ! $this->listoutput )
 303                                 $s[] = "<ol start='" . ( $offset + 1 ) . "' class='special'>";
 304
 305                         # Only read at most $num rows, because $res may contain the whole 1000
 306                         for ( $i = 0; $i < $num && $obj = $dbr->fetchObject( $res ); $i++ ) {
 307                                 $format = $this->formatResult( $sk, $obj );
 308                                 if ( $format ) {
 309                                         $attr = ( isset ( $obj->usepatrol ) && $obj->usepatrol &&
 310                                                                                 $obj->patrolled == 0 ) ? ' class="not-patrolled"' : '';
 311                                         $s[] = $this->listoutput ? $format : "<li{$attr}>{$format}</li>\n";
 312                                 }
 313                         }
 314
 315                         if($this->tryLastResult()) {
 316                                 // flush the very last result
 317                                 $obj = null;
 318                                 $format = $this->formatResult( $sk, $obj );
 319                                 if( $format ) {
 320                                         $attr = ( isset ( $obj->usepatrol ) && $obj->usepatrol &&
 321                                                                                 $obj->patrolled == 0 ) ? ' class="not-patrolled"' : '';
 322                                         $s[] = "<li{$attr}>{$format}</li>\n";
 323                                 }
 324                         }
 325
 326                         $dbr->freeResult( $res );
 327                         if ( ! $this->listoutput )
 328                                 $s[] = '</ol>';
 329                         $str = $this->listoutput ? $wgContLang->listToText( $s ) : implode( '', $s );
 330                         $wgOut->addHTML( $str );
 331                 }
 332                 if($shownavigation) {
 333                         $wgOut->addHTML( "<p>{$sl}</p>\n" );
 334                 }
 335                 return $num;
 336         }
 337
 338         /**
 339          * Do any necessary preprocessing of the result object.
 340          * You should pass this by reference: &$db , &$res
 341          */
 342         function preprocessResults( $db, $res ) {}
 343
 344         /**
 345          * Similar to above, but packaging in a syndicated feed instead of a web page
 346          */
 347         function doFeed( $class = '' ) {
 348                 global $wgFeedClasses;
 349
 350                 if( isset($wgFeedClasses[$class]) ) {
 351                         $feed = new $wgFeedClasses[$class](
 352                                 $this->feedTitle(),
 353                                 $this->feedDesc(),
 354                                 $this->feedUrl() );
 355                         $feed->outHeader();
 356
 357                         $dbr =& wfGetDB( DB_SLAVE );
 358                         $sql = $this->getSQL() . $this->getOrder();
 359                         $sql = $dbr->limitResult( $sql, 50, 0 );
 360                         $res = $dbr->query( $sql, 'QueryPage::doFeed' );
 361                         while( $obj = $dbr->fetchObject( $res ) ) {
 362                                 $item = $this->feedResult( $obj );
 363                                 if( $item ) $feed->outItem( $item );
 364                         }
 365                         $dbr->freeResult( $res );
 366
 367                         $feed->outFooter();
 368                         return true;
 369                 } else {
 370                         return false;
 371                 }
 372         }
 373
 374         /**
 375          * Override for custom handling. If the titles/links are ok, just do
 376          * feedItemDesc()
 377          */
 378         function feedResult( $row ) {
 379                 if( !isset( $row->title ) ) {
 380                         return NULL;
 381                 }
 382                 $title = Title::MakeTitle( intval( $row->namespace ), $row->title );
 383                 if( $title ) {
 384                         $date = isset( $row->timestamp ) ? $row->timestamp : '';
 385                         $comments = '';
 386                         if( $title ) {
 387                                 $talkpage = $title->getTalkPage();
 388                                 $comments = $talkpage->getFullURL();
 389                         }
 390
 391                         return new FeedItem(
 392                                 $title->getPrefixedText(),
 393                                 $this->feedItemDesc( $row ),
 394                                 $title->getFullURL(),
 395                                 $date,
 396                                 $this->feedItemAuthor( $row ),
 397                                 $comments);
 398                 } else {
 399                         return NULL;
 400                 }
 401         }
 402
 403         function feedItemDesc( $row ) {
 404                 return isset( $row->comment ) ? htmlspecialchars( $row->comment ) : '';
 405         }
 406
 407         function feedItemAuthor( $row ) {
 408                 return isset( $row->user_text ) ? $row->user_text : '';
 409         }
 410
 411         function feedTitle() {
 412                 global $wgLanguageCode, $wgSitename;
 413                 $page = SpecialPage::getPage( $this->getName() );
 414                 $desc = $page->getDescription();
 415                 return "$wgSitename - $desc [$wgLanguageCode]";
 416         }
 417
 418         function feedDesc() {
 419                 return wfMsg( 'tagline' );
 420         }
 421
 422         function feedUrl() {
 423                 $title = Title::MakeTitle( NS_SPECIAL, $this->getName() );
 424                 return $title->getFullURL();
 425         }
 426 }
 427
 428 /**
 429  * This is a subclass for very simple queries that are just looking for page
 430  * titles that match some criteria. It formats each result item as a link to
 431  * that page.
 432  *
 433  * @package MediaWiki
 434  */
 435 class PageQueryPage extends QueryPage {
 436
 437         function formatResult( $skin, $result ) {
 438                 global $wgContLang;
 439                 $nt = Title::makeTitle( $result->namespace, $result->title );
 440                 return $skin->makeKnownLinkObj( $nt, htmlspecialchars( $wgContLang->convert( $nt->getPrefixedText() ) ) );
 441         }
 442 }
 443
 444 ?>