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