includes/specialpage/ChangesListSpecialPage.php

   1 <?php
   2 /**
   3  * Special page which uses a ChangesList to show query results.
   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  */
  23
  24 /**
  25  * Special page which uses a ChangesList to show query results.
  26  * @todo Way too many public functions, most of them should be protected
  27  *
  28  * @ingroup SpecialPage
  29  */
  30 abstract class ChangesListSpecialPage extends SpecialPage {
  31         /** @var string */
  32         protected $rcSubpage;
  33
  34         /** @var FormOptions */
  35         protected $rcOptions;
  36
  37         /** @var array */
  38         protected $customFilters;
  39
  40         /**
  41          * Main execution point
  42          *
  43          * @param string $subpage
  44          */
  45         public function execute( $subpage ) {
  46                 $this->rcSubpage = $subpage;
  47
  48                 $this->setHeaders();
  49                 $this->outputHeader();
  50                 $this->addModules();
  51
  52                 $rows = $this->getRows();
  53                 $opts = $this->getOptions();
  54                 if ( $rows === false ) {
  55                         if ( !$this->including() ) {
  56                                 $this->doHeader( $opts, 0 );
  57                                 $this->getOutput()->setStatusCode( 404 );
  58                         }
  59
  60                         return;
  61                 }
  62
  63                 $batch = new LinkBatch;
  64                 foreach ( $rows as $row ) {
  65                         $batch->add( NS_USER, $row->rc_user_text );
  66                         $batch->add( NS_USER_TALK, $row->rc_user_text );
  67                         $batch->add( $row->rc_namespace, $row->rc_title );
  68                         if ( $row->rc_source === RecentChange::SRC_LOG ) {
  69                                 $formatter = LogFormatter::newFromRow( $row );
  70                                 foreach ( $formatter->getPreloadTitles() as $title ) {
  71                                         $batch->addObj( $title );
  72                                 }
  73                         }
  74                 }
  75                 $batch->execute();
  76
  77                 $this->webOutput( $rows, $opts );
  78
  79                 $rows->free();
  80         }
  81
  82         /**
  83          * Get the database result for this special page instance. Used by ApiFeedRecentChanges.
  84          *
  85          * @return bool|ResultWrapper Result or false
  86          */
  87         public function getRows() {
  88                 $opts = $this->getOptions();
  89                 $conds = $this->buildMainQueryConds( $opts );
  90
  91                 return $this->doMainQuery( $conds, $opts );
  92         }
  93
  94         /**
  95          * Get the current FormOptions for this request
  96          *
  97          * @return FormOptions
  98          */
  99         public function getOptions() {
 100                 if ( $this->rcOptions === null ) {
 101                         $this->rcOptions = $this->setup( $this->rcSubpage );
 102                 }
 103
 104                 return $this->rcOptions;
 105         }
 106
 107         /**
 108          * Create a FormOptions object with options as specified by the user
 109          *
 110          * @param array $parameters
 111          *
 112          * @return FormOptions
 113          */
 114         public function setup( $parameters ) {
 115                 $opts = $this->getDefaultOptions();
 116                 foreach ( $this->getCustomFilters() as $key => $params ) {
 117                         $opts->add( $key, $params['default'] );
 118                 }
 119
 120                 $opts = $this->fetchOptionsFromRequest( $opts );
 121
 122                 // Give precedence to subpage syntax
 123                 if ( $parameters !== null ) {
 124                         $this->parseParameters( $parameters, $opts );
 125                 }
 126
 127                 $this->validateOptions( $opts );
 128
 129                 return $opts;
 130         }
 131
 132         /**
 133          * Get a FormOptions object containing the default options. By default returns some basic options,
 134          * you might want to not call parent method and discard them, or to override default values.
 135          *
 136          * @return FormOptions
 137          */
 138         public function getDefaultOptions() {
 139                 $opts = new FormOptions();
 140
 141                 $opts->add( 'hideminor', false );
 142                 $opts->add( 'hidebots', false );
 143                 $opts->add( 'hideanons', false );
 144                 $opts->add( 'hideliu', false );
 145                 $opts->add( 'hidepatrolled', false );
 146                 $opts->add( 'hidemyself', false );
 147
 148                 $opts->add( 'namespace', '', FormOptions::INTNULL );
 149                 $opts->add( 'invert', false );
 150                 $opts->add( 'associated', false );
 151
 152                 return $opts;
 153         }
 154
 155         /**
 156          * Get custom show/hide filters
 157          *
 158          * @return array Map of filter URL param names to properties (msg/default)
 159          */
 160         protected function getCustomFilters() {
 161                 if ( $this->customFilters === null ) {
 162                         $this->customFilters = array();
 163                         Hooks::run( 'ChangesListSpecialPageFilters', array( $this, &$this->customFilters ) );
 164                 }
 165
 166                 return $this->customFilters;
 167         }
 168
 169         /**
 170          * Fetch values for a FormOptions object from the WebRequest associated with this instance.
 171          *
 172          * Intended for subclassing, e.g. to add a backwards-compatibility layer.
 173          *
 174          * @param FormOptions $opts
 175          * @return FormOptions
 176          */
 177         protected function fetchOptionsFromRequest( $opts ) {
 178                 $opts->fetchValuesFromRequest( $this->getRequest() );
 179
 180                 return $opts;
 181         }
 182
 183         /**
 184          * Process $par and put options found in $opts. Used when including the page.
 185          *
 186          * @param string $par
 187          * @param FormOptions $opts
 188          */
 189         public function parseParameters( $par, FormOptions $opts ) {
 190                 // nothing by default
 191         }
 192
 193         /**
 194          * Validate a FormOptions object generated by getDefaultOptions() with values already populated.
 195          *
 196          * @param FormOptions $opts
 197          */
 198         public function validateOptions( FormOptions $opts ) {
 199                 // nothing by default
 200         }
 201
 202         /**
 203          * Return an array of conditions depending of options set in $opts
 204          *
 205          * @param FormOptions $opts
 206          * @return array
 207          */
 208         public function buildMainQueryConds( FormOptions $opts ) {
 209                 $dbr = $this->getDB();
 210                 $user = $this->getUser();
 211                 $conds = array();
 212
 213                 // It makes no sense to hide both anons and logged-in users. When this occurs, try a guess on
 214                 // what the user meant and either show only bots or force anons to be shown.
 215                 $botsonly = false;
 216                 $hideanons = $opts['hideanons'];
 217                 if ( $opts['hideanons'] && $opts['hideliu'] ) {
 218                         if ( $opts['hidebots'] ) {
 219                                 $hideanons = false;
 220                         } else {
 221                                 $botsonly = true;
 222                         }
 223                 }
 224
 225                 // Toggles
 226                 if ( $opts['hideminor'] ) {
 227                         $conds['rc_minor'] = 0;
 228                 }
 229                 if ( $opts['hidebots'] ) {
 230                         $conds['rc_bot'] = 0;
 231                 }
 232                 if ( $user->useRCPatrol() && $opts['hidepatrolled'] ) {
 233                         $conds['rc_patrolled'] = 0;
 234                 }
 235                 if ( $botsonly ) {
 236                         $conds['rc_bot'] = 1;
 237                 } else {
 238                         if ( $opts['hideliu'] ) {
 239                                 $conds[] = 'rc_user = 0';
 240                         }
 241                         if ( $hideanons ) {
 242                                 $conds[] = 'rc_user != 0';
 243                         }
 244                 }
 245                 if ( $opts['hidemyself'] ) {
 246                         if ( $user->getId() ) {
 247                                 $conds[] = 'rc_user != ' . $dbr->addQuotes( $user->getId() );
 248                         } else {
 249                                 $conds[] = 'rc_user_text != ' . $dbr->addQuotes( $user->getName() );
 250                         }
 251                 }
 252
 253                 // Namespace filtering
 254                 if ( $opts['namespace'] !== '' ) {
 255                         $selectedNS = $dbr->addQuotes( $opts['namespace'] );
 256                         $operator = $opts['invert'] ? '!=' : '=';
 257                         $boolean = $opts['invert'] ? 'AND' : 'OR';
 258
 259                         // Namespace association (bug 2429)
 260                         if ( !$opts['associated'] ) {
 261                                 $condition = "rc_namespace $operator $selectedNS";
 262                         } else {
 263                                 // Also add the associated namespace
 264                                 $associatedNS = $dbr->addQuotes(
 265                                         MWNamespace::getAssociated( $opts['namespace'] )
 266                                 );
 267                                 $condition = "(rc_namespace $operator $selectedNS "
 268                                         . $boolean
 269                                         . " rc_namespace $operator $associatedNS)";
 270                         }
 271
 272                         $conds[] = $condition;
 273                 }
 274
 275                 return $conds;
 276         }
 277
 278         /**
 279          * Process the query
 280          *
 281          * @param array $conds
 282          * @param FormOptions $opts
 283          * @return bool|ResultWrapper Result or false
 284          */
 285         public function doMainQuery( $conds, $opts ) {
 286                 $tables = array( 'recentchanges' );
 287                 $fields = RecentChange::selectFields();
 288                 $query_options = array();
 289                 $join_conds = array();
 290
 291                 ChangeTags::modifyDisplayQuery(
 292                         $tables,
 293                         $fields,
 294                         $conds,
 295                         $join_conds,
 296                         $query_options,
 297                         ''
 298                 );
 299
 300                 if ( !$this->runMainQueryHook( $tables, $fields, $conds, $query_options, $join_conds,
 301                         $opts )
 302                 ) {
 303                         return false;
 304                 }
 305
 306                 $dbr = $this->getDB();
 307
 308                 return $dbr->select(
 309                         $tables,
 310                         $fields,
 311                         $conds,
 312                         __METHOD__,
 313                         $query_options,
 314                         $join_conds
 315                 );
 316         }
 317
 318         protected function runMainQueryHook( &$tables, &$fields, &$conds, &$query_options, &$join_conds, $opts ) {
 319                 return Hooks::run(
 320                         'ChangesListSpecialPageQuery',
 321                         array( $this->getName(), &$tables, &$fields, &$conds, &$query_options, &$join_conds, $opts )
 322                 );
 323         }
 324
 325         /**
 326          * Return a IDatabase object for reading
 327          *
 328          * @return IDatabase
 329          */
 330         protected function getDB() {
 331                 return wfGetDB( DB_SLAVE );
 332         }
 333
 334         /**
 335          * Send output to the OutputPage object, only called if not used feeds
 336          *
 337          * @param ResultWrapper $rows Database rows
 338          * @param FormOptions $opts
 339          */
 340         public function webOutput( $rows, $opts ) {
 341                 if ( !$this->including() ) {
 342                         $this->outputFeedLinks();
 343                         $this->doHeader( $opts, $rows->numRows() );
 344                 }
 345
 346                 $this->outputChangesList( $rows, $opts );
 347         }
 348
 349         /**
 350          * Output feed links.
 351          */
 352         public function outputFeedLinks() {
 353                 // nothing by default
 354         }
 355
 356         /**
 357          * Build and output the actual changes list.
 358          *
 359          * @param array $rows Database rows
 360          * @param FormOptions $opts
 361          */
 362         abstract public function outputChangesList( $rows, $opts );
 363
 364         /**
 365          * Set the text to be displayed above the changes
 366          *
 367          * @param FormOptions $opts
 368          * @param int $numRows Number of rows in the result to show after this header
 369          */
 370         public function doHeader( $opts, $numRows ) {
 371                 $this->setTopText( $opts );
 372
 373                 // @todo Lots of stuff should be done here.
 374
 375                 $this->setBottomText( $opts );
 376         }
 377
 378         /**
 379          * Send the text to be displayed before the options. Should use $this->getOutput()->addWikiText()
 380          * or similar methods to print the text.
 381          *
 382          * @param FormOptions $opts
 383          */
 384         function setTopText( FormOptions $opts ) {
 385                 // nothing by default
 386         }
 387
 388         /**
 389          * Send the text to be displayed after the options. Should use $this->getOutput()->addWikiText()
 390          * or similar methods to print the text.
 391          *
 392          * @param FormOptions $opts
 393          */
 394         function setBottomText( FormOptions $opts ) {
 395                 // nothing by default
 396         }
 397
 398         /**
 399          * Get options to be displayed in a form
 400          * @todo This should handle options returned by getDefaultOptions().
 401          * @todo Not called by anything, should be called by something… doHeader() maybe?
 402          *
 403          * @param FormOptions $opts
 404          * @return array
 405          */
 406         function getExtraOptions( $opts ) {
 407                 return array();
 408         }
 409
 410         /**
 411          * Return the legend displayed within the fieldset
 412          * @todo This should not be static, then we can drop the parameter
 413          * @todo Not called by anything, should be called by doHeader()
 414          *
 415          * @param IContextSource $context The object available as $this in non-static functions
 416          * @return string
 417          */
 418         public static function makeLegend( IContextSource $context ) {
 419                 $user = $context->getUser();
 420                 # The legend showing what the letters and stuff mean
 421                 $legend = Html::openElement( 'dl' ) . "\n";
 422                 # Iterates through them and gets the messages for both letter and tooltip
 423                 $legendItems = $context->getConfig()->get( 'RecentChangesFlags' );
 424                 if ( !( $user->useRCPatrol() || $user->useNPPatrol() ) ) {
 425                         unset( $legendItems['unpatrolled'] );
 426                 }
 427                 foreach ( $legendItems as $key => $item ) { # generate items of the legend
 428                         $label = isset( $item['legend'] ) ? $item['legend'] : $item['title'];
 429                         $letter = $item['letter'];
 430                         $cssClass = isset( $item['class'] ) ? $item['class'] : $key;
 431
 432                         $legend .= Html::element( 'dt',
 433                                 array( 'class' => $cssClass ), $context->msg( $letter )->text()
 434                         ) . "\n" .
 435                         Html::rawElement( 'dd', array(),
 436                                 $context->msg( $label )->parse()
 437                         ) . "\n";
 438                 }
 439                 # (+-123)
 440                 $legend .= Html::rawElement( 'dt',
 441                         array( 'class' => 'mw-plusminus-pos' ),
 442                         $context->msg( 'recentchanges-legend-plusminus' )->parse()
 443                 ) . "\n";
 444                 $legend .= Html::element(
 445                         'dd',
 446                         array( 'class' => 'mw-changeslist-legend-plusminus' ),
 447                         $context->msg( 'recentchanges-label-plusminus' )->text()
 448                 ) . "\n";
 449                 $legend .= Html::closeElement( 'dl' ) . "\n";
 450
 451                 # Collapsibility
 452                 $legend =
 453                         '<div class="mw-changeslist-legend">' .
 454                                 $context->msg( 'recentchanges-legend-heading' )->parse() .
 455                                 '<div class="mw-collapsible-content">' . $legend . '</div>' .
 456                         '</div>';
 457
 458                 return $legend;
 459         }
 460
 461         /**
 462          * Add page-specific modules.
 463          */
 464         protected function addModules() {
 465                 $out = $this->getOutput();
 466                 // Styles and behavior for the legend box (see makeLegend())
 467                 $out->addModuleStyles( 'mediawiki.special.changeslist.legend' );
 468                 $out->addModules( 'mediawiki.special.changeslist.legend.js' );
 469         }
 470
 471         protected function getGroupName() {
 472                 return 'changes';
 473         }
 474 }