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