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  * This is a class for doing query pages; since they're almost all the same,
  14  * we factor out some of the functionality into a superclass, and let
  15  * subclasses derive from it.
  16  *
  17  * @package MediaWiki
  18  */
  19 class QueryPage {
  20
  21         /**
  22          * Subclasses return their name here. Make sure the name is also
  23          * specified in SpecialPage.php and in Language.php as a language message
  24          * param.
  25          */
  26         function getName() {
  27                 return '';
  28         }
  29
  30         /**
  31          * Subclasses return an SQL query here.
  32          *
  33          * Note that the query itself should return the following four columns:
  34          * 'type' (your special page's name), 'namespace', 'title', and 'value'
  35          * *in that order*. 'value' is used for sorting.
  36          *
  37          * These may be stored in the querycache table for expensive queries,
  38          * and that cached data will be returned sometimes, so the presence of
  39          * extra fields can't be relied upon. The cached 'value' column will be
  40          * an integer; non-numeric values are useful only for sorting the initial
  41          * query.
  42          *
  43          * Don't include an ORDER or LIMIT clause, this will be added.
  44          */
  45         function getSQL() {
  46                 return "SELECT 'sample' as type, 0 as namespace, 'Sample result' as title, 42 as value";
  47         }
  48
  49         /**
  50          * Override to sort by increasing values
  51          */
  52         function sortDescending() {
  53                 return true;
  54         }
  55
  56         function getOrder() {
  57                 return ' ORDER BY value ' .
  58                         ($this->sortDescending() ? 'DESC' : '');
  59         }
  60
  61         /**
  62          * Is this query expensive (for some definition of expensive)? Then we
  63          * don't let it run in miser mode. $wgDisableQueryPages causes all query
  64          * pages to be declared expensive. Some query pages are always expensive.
  65          */
  66         function isExpensive( ) {
  67                 global $wgDisableQueryPages;
  68                 return $wgDisableQueryPages;
  69         }
  70
  71         /**
  72          * Sometime we dont want to build rss / atom feeds.
  73          */
  74         function isSyndicated() {
  75                 return true;
  76         }
  77
  78         /**
  79          * Formats the results of the query for display. The skin is the current
  80          * skin; you can use it for making links. The result is a single row of
  81          * result data. You should be able to grab SQL results off of it.
  82          */
  83         function formatResult( $skin, $result ) {
  84                 return '';
  85         }
  86
  87         /**
  88          * The content returned by this function will be output before any result
  89         */
  90         function getPageHeader( ) {
  91                 return '';
  92         }
  93
  94         /**
  95          * This is the actual workhorse. It does everything needed to make a
  96          * real, honest-to-gosh query page.
  97          *
  98          * @param $offset database query offset
  99          * @param $limit database query limit
 100          */
 101         function doQuery( $offset, $limit ) {
 102                 global $wgUser, $wgOut, $wgLang, $wgRequest, $wgContLang;
 103                 global $wgMiserMode;
 104
 105                 $sname = $this->getName();
 106                 $fname = get_class($this) . '::doQuery';
 107                 $sql = $this->getSQL();
 108                 $dbr =& wfGetDB( DB_SLAVE );
 109                 $dbw =& wfGetDB( DB_MASTER );
 110                 $querycache = $dbr->tableName( 'querycache' );
 111
 112                 $wgOut->setSyndicated( $this->isSyndicated() );
 113                 $res = false;
 114
 115                 if ( $this->isExpensive() ) {
 116                         $recache = $wgRequest->getBool( 'recache' );
 117                         if( $recache ) {
 118                                 # Clear out any old cached data
 119                                 $dbw->delete( 'querycache', array( 'qc_type' => $sname ), $fname );
 120
 121                                 # Do query on the (possibly out of date) slave server
 122                                 $maxstored = 1000;
 123                                 $res = $dbr->query( $sql . $this->getOrder() . $dbr->limitResult( $maxstored,0 ), $fname );
 124
 125                                 # Fetch results
 126                                 $insertSql = "INSERT INTO $querycache (qc_type,qc_namespace,qc_title,qc_value) VALUES ";
 127                                 $first = true;
 128                                 while ( $row = $dbr->fetchObject( $res ) ) {
 129                                         if ( $first ) {
 130                                                 $first = false;
 131                                         } else {
 132                                                 $insertSql .= ',';
 133                                         }
 134                                         $insertSql .= '(' .
 135                                                 $dbw->addQuotes( $row->type ) . ',' .
 136                                                 $dbw->addQuotes( $row->namespace ) . ',' .
 137                                                 $dbw->addQuotes( $row->title ) . ',' .
 138                                                 $dbw->addQuotes( $row->value ) . ')';
 139                                 }
 140
 141                                 # Save results into the querycache table on the master
 142                                 $dbw->query( $insertSql, $fname );
 143
 144                                 # Set result pointer to allow reading for display
 145                                 $numRows = $dbr->numRows( $res );
 146                                 if ( $numRows <= $offset ) {
 147                                         $num = 0;
 148                                 } else {
 149                                         $dbr->dataSeek( $res, $offset );
 150                                         $num = max( $limit, $numRows - $offset );
 151                                 }
 152                         }
 153                         if( $wgMiserMode || $recache ) {
 154                                 $type = $dbr->strencode( $sname );
 155                                 $sql =
 156                                         "SELECT qc_type as type, qc_namespace as namespace,qc_title as title, qc_value as value
 157                                          FROM $querycache WHERE qc_type='$type'";
 158                         }
 159                         if( $wgMiserMode ) {
 160                                 $wgOut->addWikiText( wfMsg( 'perfcached' ) );
 161                         }
 162                 }
 163                 if ( $res === false ) {
 164                         $res = $dbr->query( $sql . $this->getOrder() .
 165                                             $dbr->limitResult( $limit,$offset ), $fname );
 166                         $num = $dbr->numRows($res);
 167                 }
 168
 169
 170                 $sk = $wgUser->getSkin( );
 171
 172                 $wgOut->addHTML( $this->getPageHeader() );
 173
 174                 $top = wfShowingResults( $offset, $num);
 175                 $wgOut->addHTML( "<p>{$top}\n" );
 176
 177                 # often disable 'next' link when we reach the end
 178                 if($num < $limit) { $atend = true; } else { $atend = false; }
 179
 180                 $sl = wfViewPrevNext( $offset, $limit , $wgContLang->specialPage( $sname ), "" ,$atend );
 181                 $wgOut->addHTML( "<br />{$sl}</p>\n" );
 182
 183                 if ( $num > 0 ) {
 184                         $s = "<ol start='" . ( $offset + 1 ) . "' class='special'>";
 185                         # Only read at most $num rows, because $res may contain the whole 1000
 186                         for ( $i = 0; $i < $num && $obj = $dbr->fetchObject( $res ); $i++ ) {
 187                                 $format = $this->formatResult( $sk, $obj );
 188                                 if ( $format ) {
 189                                         $attr = ( isset ( $obj->usepatrol ) && $obj->usepatrol &&
 190                                                                                 $obj->patrolled == 0 ) ? ' class="not-patrolled"' : '';
 191                                         $s .= "<li{$attr}>{$format}</li>\n";
 192                                 }
 193                         }
 194                         $dbr->freeResult( $res );
 195                         $s .= '</ol>';
 196                         $wgOut->addHTML( $s );
 197                 }
 198                 $wgOut->addHTML( "<p>{$sl}</p>\n" );
 199         }
 200
 201         /**
 202          * Similar to above, but packaging in a syndicated feed instead of a web page
 203          */
 204         function doFeed( $class = '' ) {
 205                 global $wgFeedClasses;
 206                 global $wgOut, $wgLanguageCode, $wgLang;
 207                 if( isset($wgFeedClasses[$class]) ) {
 208                         $feed = new $wgFeedClasses[$class](
 209                                 $this->feedTitle(),
 210                                 $this->feedDesc(),
 211                                 $this->feedUrl() );
 212                         $feed->outHeader();
 213
 214                         $dbr =& wfGetDB( DB_SLAVE );
 215                         $sql = $this->getSQL() . $this->getOrder().$dbr->limitResult( 50, 0 );
 216                         $res = $dbr->query( $sql, 'QueryPage::doFeed' );
 217                         while( $obj = $dbr->fetchObject( $res ) ) {
 218                                 $item = $this->feedResult( $obj );
 219                                 if( $item ) $feed->outItem( $item );
 220                         }
 221                         $dbr->freeResult( $res );
 222
 223                         $feed->outFooter();
 224                         return true;
 225                 } else {
 226                         return false;
 227                 }
 228         }
 229
 230         /**
 231          * Override for custom handling. If the titles/links are ok, just do
 232          * feedItemDesc()
 233          */
 234         function feedResult( $row ) {
 235                 if( !isset( $row->title ) ) {
 236                         return NULL;
 237                 }
 238                 $title = Title::MakeTitle( IntVal( $row->namespace ), $row->title );
 239                 if( $title ) {
 240                         if( isset( $row->timestamp ) ) {
 241                                 $date = $row->timestamp;
 242                         } else {
 243                                 $date = '';
 244                         }
 245
 246                         $comments = '';
 247                         if( $title ) {
 248                                 $talkpage = $title->getTalkPage();
 249                                 $comments = $talkpage->getFullURL();
 250                         }
 251
 252                         return new FeedItem(
 253                                 $title->getText(),
 254                                 $this->feedItemDesc( $row ),
 255                                 $title->getFullURL(),
 256                                 $date,
 257                                 $this->feedItemAuthor( $row ),
 258                                 $comments);
 259                 } else {
 260                         return NULL;
 261                 }
 262         }
 263
 264         function feedItemDesc( $row ) {
 265                 $text = '';
 266                 if( isset( $row->comment ) ) {
 267                         $text = htmlspecialchars( $row->comment );
 268                 } else {
 269                         $text = '';
 270                 }
 271
 272                 if( isset( $row->text ) ) {
 273                         $text = '<p>' . htmlspecialchars( wfMsg( 'summary' ) ) . ': ' . $text . "</p>\n<hr />\n<div>" .
 274                                 nl2br( htmlspecialchars( $row->text ) ) . "</div>";;
 275                 }
 276                 return $text;
 277         }
 278
 279         function feedItemAuthor( $row ) {
 280                 if( isset( $row->user_text ) ) {
 281                         return $row->user_text;
 282                 } else {
 283                         return '';
 284                 }
 285         }
 286
 287         function feedTitle() {
 288                 global $wgLanguageCode, $wgSitename, $wgLang;
 289                 $page = SpecialPage::getPage( $this->getName() );
 290                 $desc = $page->getDescription();
 291                 return "$wgSitename - $desc [$wgLanguageCode]";
 292         }
 293
 294         function feedDesc() {
 295                 return wfMsg( 'tagline' );
 296         }
 297
 298         function feedUrl() {
 299                 global $wgLang;
 300                 $title = Title::MakeTitle( NS_SPECIAL, $this->getName() );
 301                 return $title->getFullURL();
 302         }
 303 }
 304
 305 /**
 306  * This is a subclass for very simple queries that are just looking for page
 307  * titles that match some criteria. It formats each result item as a link to
 308  * that page.
 309  *
 310  * @package MediaWiki
 311  */
 312 class PageQueryPage extends QueryPage {
 313
 314         function formatResult( $skin, $result ) {
 315                 global $wgContLang;
 316                 $nt = Title::makeTitle( $result->namespace, $result->title );
 317                 return $skin->makeKnownLinkObj( $nt, $wgContLang->convert( $result->title ) );
 318         }
 319 }
 320
 321 ?>