includes/api/ApiQueryInfo.php

   1 <?php
   2
   3 /*
   4  * Created on Sep 25, 2006
   5  *
   6  * API for MediaWiki 1.8+
   7  *
   8  * Copyright (C) 2006 Yuri Astrakhan <Firstname><Lastname>@gmail.com
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License along
  21  * with this program; if not, write to the Free Software Foundation, Inc.,
  22  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  23  * http://www.gnu.org/copyleft/gpl.html
  24  */
  25
  26 if ( !defined( 'MEDIAWIKI' ) ) {
  27         // Eclipse helper - will be ignored in production
  28         require_once ( 'ApiQueryBase.php' );
  29 }
  30
  31 /**
  32  * A query module to show basic page information.
  33  *
  34  * @ingroup API
  35  */
  36 class ApiQueryInfo extends ApiQueryBase {
  37
  38         private $fld_protection = false, $fld_talkid = false,
  39                 $fld_subjectid = false, $fld_url = false,
  40                 $fld_readable = false, $fld_watched = false,
  41                 $fld_preload = false;
  42
  43         public function __construct( $query, $moduleName ) {
  44                 parent :: __construct( $query, $moduleName, 'in' );
  45         }
  46
  47         public function requestExtraData( $pageSet ) {
  48                 $pageSet->requestField( 'page_restrictions' );
  49                 $pageSet->requestField( 'page_is_redirect' );
  50                 $pageSet->requestField( 'page_is_new' );
  51                 $pageSet->requestField( 'page_counter' );
  52                 $pageSet->requestField( 'page_touched' );
  53                 $pageSet->requestField( 'page_latest' );
  54                 $pageSet->requestField( 'page_len' );
  55         }
  56
  57         /**
  58          * Get an array mapping token names to their handler functions.
  59          * The prototype for a token function is func($pageid, $title)
  60          * it should return a token or false (permission denied)
  61          * @return array(tokenname => function)
  62          */
  63         protected function getTokenFunctions() {
  64                 // Don't call the hooks twice
  65                 if ( isset( $this->tokenFunctions ) )
  66                         return $this->tokenFunctions;
  67
  68                 // If we're in JSON callback mode, no tokens can be obtained
  69                 if ( !is_null( $this->getMain()->getRequest()->getVal( 'callback' ) ) )
  70                         return array();
  71
  72                 $this->tokenFunctions = array(
  73                         'edit' => array( 'ApiQueryInfo', 'getEditToken' ),
  74                         'delete' => array( 'ApiQueryInfo', 'getDeleteToken' ),
  75                         'protect' => array( 'ApiQueryInfo', 'getProtectToken' ),
  76                         'move' => array( 'ApiQueryInfo', 'getMoveToken' ),
  77                         'block' => array( 'ApiQueryInfo', 'getBlockToken' ),
  78                         'unblock' => array( 'ApiQueryInfo', 'getUnblockToken' ),
  79                         'email' => array( 'ApiQueryInfo', 'getEmailToken' ),
  80                         'import' => array( 'ApiQueryInfo', 'getImportToken' ),
  81                 );
  82                 wfRunHooks( 'APIQueryInfoTokens', array( &$this->tokenFunctions ) );
  83                 return $this->tokenFunctions;
  84         }
  85
  86         public static function getEditToken( $pageid, $title )
  87         {
  88                 // We could check for $title->userCan('edit') here,
  89                 // but that's too expensive for this purpose
  90                 // and would break caching
  91                 global $wgUser;
  92                 if ( !$wgUser->isAllowed( 'edit' ) )
  93                         return false;
  94
  95                 // The edit token is always the same, let's exploit that
  96                 static $cachedEditToken = null;
  97                 if ( !is_null( $cachedEditToken ) )
  98                         return $cachedEditToken;
  99
 100                 $cachedEditToken = $wgUser->editToken();
 101                 return $cachedEditToken;
 102         }
 103
 104         public static function getDeleteToken( $pageid, $title )
 105         {
 106                 global $wgUser;
 107                 if ( !$wgUser->isAllowed( 'delete' ) )
 108                         return false;
 109
 110                 static $cachedDeleteToken = null;
 111                 if ( !is_null( $cachedDeleteToken ) )
 112                         return $cachedDeleteToken;
 113
 114                 $cachedDeleteToken = $wgUser->editToken();
 115                 return $cachedDeleteToken;
 116         }
 117
 118         public static function getProtectToken( $pageid, $title )
 119         {
 120                 global $wgUser;
 121                 if ( !$wgUser->isAllowed( 'protect' ) )
 122                         return false;
 123
 124                 static $cachedProtectToken = null;
 125                 if ( !is_null( $cachedProtectToken ) )
 126                         return $cachedProtectToken;
 127
 128                 $cachedProtectToken = $wgUser->editToken();
 129                 return $cachedProtectToken;
 130         }
 131
 132         public static function getMoveToken( $pageid, $title )
 133         {
 134                 global $wgUser;
 135                 if ( !$wgUser->isAllowed( 'move' ) )
 136                         return false;
 137
 138                 static $cachedMoveToken = null;
 139                 if ( !is_null( $cachedMoveToken ) )
 140                         return $cachedMoveToken;
 141
 142                 $cachedMoveToken = $wgUser->editToken();
 143                 return $cachedMoveToken;
 144         }
 145
 146         public static function getBlockToken( $pageid, $title )
 147         {
 148                 global $wgUser;
 149                 if ( !$wgUser->isAllowed( 'block' ) )
 150                         return false;
 151
 152                 static $cachedBlockToken = null;
 153                 if ( !is_null( $cachedBlockToken ) )
 154                         return $cachedBlockToken;
 155
 156                 $cachedBlockToken = $wgUser->editToken();
 157                 return $cachedBlockToken;
 158         }
 159
 160         public static function getUnblockToken( $pageid, $title )
 161         {
 162                 // Currently, this is exactly the same as the block token
 163                 return self::getBlockToken( $pageid, $title );
 164         }
 165
 166         public static function getEmailToken( $pageid, $title )
 167         {
 168                 global $wgUser;
 169                 if ( !$wgUser->canSendEmail() || $wgUser->isBlockedFromEmailUser() )
 170                         return false;
 171
 172                 static $cachedEmailToken = null;
 173                 if ( !is_null( $cachedEmailToken ) )
 174                         return $cachedEmailToken;
 175
 176                 $cachedEmailToken = $wgUser->editToken();
 177                 return $cachedEmailToken;
 178         }
 179
 180         public static function getImportToken( $pageid, $title )
 181         {
 182                 global $wgUser;
 183                 if ( !$wgUser->isAllowed( 'import' ) )
 184                         return false;
 185
 186                 static $cachedImportToken = null;
 187                 if ( !is_null( $cachedImportToken ) )
 188                         return $cachedImportToken;
 189
 190                 $cachedImportToken = $wgUser->editToken();
 191                 return $cachedImportToken;
 192         }
 193
 194         public function execute() {
 195                 $this->params = $this->extractRequestParams();
 196                 if ( !is_null( $this->params['prop'] ) ) {
 197                         $prop = array_flip( $this->params['prop'] );
 198                         $this->fld_protection = isset( $prop['protection'] );
 199                         $this->fld_watched = isset( $prop['watched'] );
 200                         $this->fld_talkid = isset( $prop['talkid'] );
 201                         $this->fld_subjectid = isset( $prop['subjectid'] );
 202                         $this->fld_url = isset( $prop['url'] );
 203                         $this->fld_readable = isset( $prop['readable'] );
 204                         $this->fld_preload = isset ( $prop['preload'] );
 205                 }
 206
 207                 $pageSet = $this->getPageSet();
 208                 $this->titles = $pageSet->getGoodTitles();
 209                 $this->missing = $pageSet->getMissingTitles();
 210                 $this->everything = $this->titles + $this->missing;
 211                 $result = $this->getResult();
 212
 213                 uasort( $this->everything, array( 'Title', 'compare' ) );
 214                 if ( !is_null( $this->params['continue'] ) )
 215                 {
 216                         // Throw away any titles we're gonna skip so they don't
 217                         // clutter queries
 218                         $cont = explode( '|', $this->params['continue'] );
 219                         if ( count( $cont ) != 2 )
 220                                 $this->dieUsage( "Invalid continue param. You should pass the original " .
 221                                                 "value returned by the previous query", "_badcontinue" );
 222                         $conttitle = Title::makeTitleSafe( $cont[0], $cont[1] );
 223                         foreach ( $this->everything as $pageid => $title )
 224                         {
 225                                 if ( Title::compare( $title, $conttitle ) >= 0 )
 226                                         break;
 227                                 unset( $this->titles[$pageid] );
 228                                 unset( $this->missing[$pageid] );
 229                                 unset( $this->everything[$pageid] );
 230                         }
 231                 }
 232
 233                 $this->pageRestrictions = $pageSet->getCustomField( 'page_restrictions' );
 234                 $this->pageIsRedir = $pageSet->getCustomField( 'page_is_redirect' );
 235                 $this->pageIsNew = $pageSet->getCustomField( 'page_is_new' );
 236                 $this->pageCounter = $pageSet->getCustomField( 'page_counter' );
 237                 $this->pageTouched = $pageSet->getCustomField( 'page_touched' );
 238                 $this->pageLatest = $pageSet->getCustomField( 'page_latest' );
 239                 $this->pageLength = $pageSet->getCustomField( 'page_len' );
 240
 241                 $db = $this->getDB();
 242                 // Get protection info if requested
 243                 if ( $this->fld_protection )
 244                         $this->getProtectionInfo();
 245
 246                 if ( $this->fld_watched )
 247                         $this->getWatchedInfo();
 248
 249                 // Run the talkid/subjectid query if requested
 250                 if ( $this->fld_talkid || $this->fld_subjectid )
 251                         $this->getTSIDs();
 252
 253                 foreach ( $this->everything as $pageid => $title ) {
 254                         $pageInfo = $this->extractPageInfo( $pageid, $title );
 255                         $fit = $result->addValue( array (
 256                                 'query',
 257                                 'pages'
 258                         ), $pageid, $pageInfo );
 259                         if ( !$fit )
 260                         {
 261                                 $this->setContinueEnumParameter( 'continue',
 262                                                 $title->getNamespace() . '|' .
 263                                                 $title->getText() );
 264                                 break;
 265                         }
 266                 }
 267         }
 268
 269         /**
 270          * Get a result array with information about a title
 271          * @param $pageid int Page ID (negative for missing titles)
 272          * @param $title Title object
 273          * @return array
 274          */
 275         private function extractPageInfo( $pageid, $title )
 276         {
 277                 $pageInfo = array();
 278                 if ( $title->exists() )
 279                 {
 280                         $pageInfo['touched'] = wfTimestamp( TS_ISO_8601, $this->pageTouched[$pageid] );
 281                         $pageInfo['lastrevid'] = intval( $this->pageLatest[$pageid] );
 282                         $pageInfo['counter'] = intval( $this->pageCounter[$pageid] );
 283                         $pageInfo['length'] = intval( $this->pageLength[$pageid] );
 284                         if ( $this->pageIsRedir[$pageid] )
 285                                 $pageInfo['redirect'] = '';
 286                         if ( $this->pageIsNew[$pageid] )
 287                                 $pageInfo['new'] = '';
 288                 }
 289
 290                 if ( !is_null( $this->params['token'] ) ) {
 291                         $tokenFunctions = $this->getTokenFunctions();
 292                         $pageInfo['starttimestamp'] = wfTimestamp( TS_ISO_8601, time() );
 293                         foreach ( $this->params['token'] as $t )
 294                         {
 295                                 $val = call_user_func( $tokenFunctions[$t], $pageid, $title );
 296                                 if ( $val === false )
 297                                         $this->setWarning( "Action '$t' is not allowed for the current user" );
 298                                 else
 299                                         $pageInfo[$t . 'token'] = $val;
 300                         }
 301                 }
 302
 303                 if ( $this->fld_protection ) {
 304                         $pageInfo['protection'] = array();
 305                         if ( isset( $this->protections[$title->getNamespace()][$title->getDBkey()] ) )
 306                                 $pageInfo['protection'] =
 307                                         $this->protections[$title->getNamespace()][$title->getDBkey()];
 308                         $this->getResult()->setIndexedTagName( $pageInfo['protection'], 'pr' );
 309                 }
 310
 311                 if ( $this->fld_watched && isset( $this->watched[$title->getNamespace()][$title->getDBkey()] ) )
 312                         $pageInfo['watched'] = '';
 313
 314                 if ( $this->fld_talkid && isset( $this->talkids[$title->getNamespace()][$title->getDBkey()] ) )
 315                         $pageInfo['talkid'] = $this->talkids[$title->getNamespace()][$title->getDBkey()];
 316
 317                 if ( $this->fld_subjectid && isset( $this->subjectids[$title->getNamespace()][$title->getDBkey()] ) )
 318                         $pageInfo['subjectid'] = $this->subjectids[$title->getNamespace()][$title->getDBkey()];
 319
 320                 if ( $this->fld_url ) {
 321                         $pageInfo['fullurl'] = $title->getFullURL();
 322                         $pageInfo['editurl'] = $title->getFullURL( 'action=edit' );
 323                 }
 324                 if ( $this->fld_readable && $title->userCanRead() )
 325                         $pageInfo['readable'] = '';
 326
 327                 if ( $this->fld_preload ) {
 328                         if ( $title->exists() )
 329                                 $pageInfo['preload'] = '';
 330                         else {
 331                                 wfRunHooks( 'EditFormPreloadText', array( &$text, &$title ) );
 332
 333                                 $pageInfo['preload'] = $text;
 334                         }
 335                 }
 336                 return $pageInfo;
 337         }
 338
 339         /**
 340          * Get information about protections and put it in $protections
 341          */
 342         private function getProtectionInfo()
 343         {
 344                 $this->protections = array();
 345                 $db = $this->getDB();
 346
 347                 // Get normal protections for existing titles
 348                 if ( count( $this->titles ) )
 349                 {
 350                         $this->resetQueryParams();
 351                         $this->addTables( array( 'page_restrictions', 'page' ) );
 352                         $this->addWhere( 'page_id=pr_page' );
 353                         $this->addFields( array( 'pr_page', 'pr_type', 'pr_level',
 354                                         'pr_expiry', 'pr_cascade', 'page_namespace',
 355                                         'page_title' ) );
 356                         $this->addWhereFld( 'pr_page', array_keys( $this->titles ) );
 357
 358                         $res = $this->select( __METHOD__ );
 359                         while ( $row = $db->fetchObject( $res ) ) {
 360                                 $a = array(
 361                                         'type' => $row->pr_type,
 362                                         'level' => $row->pr_level,
 363                                         'expiry' => Block::decodeExpiry( $row->pr_expiry, TS_ISO_8601 )
 364                                 );
 365                                 if ( $row->pr_cascade )
 366                                         $a['cascade'] = '';
 367                                 $this->protections[$row->page_namespace][$row->page_title][] = $a;
 368
 369                                 // Also check old restrictions
 370                                 if ( $this->pageRestrictions[$row->pr_page] ) {
 371                                         $restrictions = explode( ':', trim( $this->pageRestrictions[$row->pr_page] ) );
 372                                         foreach ( $restrictions as $restrict ) {
 373                                                 $temp = explode( '=', trim( $restrict ) );
 374                                                 if ( count( $temp ) == 1 ) {
 375                                                         // old old format should be treated as edit/move restriction
 376                                                         $restriction = trim( $temp[0] );
 377
 378                                                         if ( $restriction == '' )
 379                                                                 continue;
 380                                                         $this->protections[$row->page_namespace][$row->page_title][] = array(
 381                                                                 'type' => 'edit',
 382                                                                 'level' => $restriction,
 383                                                                 'expiry' => 'infinity',
 384                                                         );
 385                                                         $this->protections[$row->page_namespace][$row->page_title][] = array(
 386                                                                 'type' => 'move',
 387                                                                 'level' => $restriction,
 388                                                                 'expiry' => 'infinity',
 389                                                         );
 390                                                 } else {
 391                                                         $restriction = trim( $temp[1] );
 392                                                         if ( $restriction == '' )
 393                                                                 continue;
 394                                                         $this->protections[$row->page_namespace][$row->page_title][] = array(
 395                                                                 'type' => $temp[0],
 396                                                                 'level' => $restriction,
 397                                                                 'expiry' => 'infinity',
 398                                                         );
 399                                                 }
 400                                         }
 401                                 }
 402                         }
 403                         $db->freeResult( $res );
 404                 }
 405
 406                 // Get protections for missing titles
 407                 if ( count( $this->missing ) )
 408                 {
 409                         $this->resetQueryParams();
 410                         $lb = new LinkBatch( $this->missing );
 411                         $this->addTables( 'protected_titles' );
 412                         $this->addFields( array( 'pt_title', 'pt_namespace', 'pt_create_perm', 'pt_expiry' ) );
 413                         $this->addWhere( $lb->constructSet( 'pt', $db ) );
 414                         $res = $this->select( __METHOD__ );
 415                         while ( $row = $db->fetchObject( $res ) ) {
 416                                 $this->protections[$row->pt_namespace][$row->pt_title][] = array(
 417                                         'type' => 'create',
 418                                         'level' => $row->pt_create_perm,
 419                                         'expiry' => Block::decodeExpiry( $row->pt_expiry, TS_ISO_8601 )
 420                                 );
 421                         }
 422                         $db->freeResult( $res );
 423                 }
 424
 425                 // Cascading protections
 426                 $images = $others = array();
 427                 foreach ( $this->everything as $title )
 428                         if ( $title->getNamespace() == NS_FILE )
 429                                 $images[] = $title->getDBkey();
 430                         else
 431                                 $others[] = $title;
 432
 433                 if ( count( $others ) ) {
 434                         // Non-images: check templatelinks
 435                         $lb = new LinkBatch( $others );
 436                         $this->resetQueryParams();
 437                         $this->addTables( array( 'page_restrictions', 'page', 'templatelinks' ) );
 438                         $this->addFields( array( 'pr_type', 'pr_level', 'pr_expiry',
 439                                         'page_title', 'page_namespace',
 440                                         'tl_title', 'tl_namespace' ) );
 441                         $this->addWhere( $lb->constructSet( 'tl', $db ) );
 442                         $this->addWhere( 'pr_page = page_id' );
 443                         $this->addWhere( 'pr_page = tl_from' );
 444                         $this->addWhereFld( 'pr_cascade', 1 );
 445
 446                         $res = $this->select( __METHOD__ );
 447                         while ( $row = $db->fetchObject( $res ) ) {
 448                                 $source = Title::makeTitle( $row->page_namespace, $row->page_title );
 449                                 $this->protections[$row->tl_namespace][$row->tl_title][] = array(
 450                                         'type' => $row->pr_type,
 451                                         'level' => $row->pr_level,
 452                                         'expiry' => Block::decodeExpiry( $row->pr_expiry, TS_ISO_8601 ),
 453                                         'source' => $source->getPrefixedText()
 454                                 );
 455                         }
 456                         $db->freeResult( $res );
 457                 }
 458
 459                 if ( count( $images ) ) {
 460                         // Images: check imagelinks
 461                         $this->resetQueryParams();
 462                         $this->addTables( array( 'page_restrictions', 'page', 'imagelinks' ) );
 463                         $this->addFields( array( 'pr_type', 'pr_level', 'pr_expiry',
 464                                         'page_title', 'page_namespace', 'il_to' ) );
 465                         $this->addWhere( 'pr_page = page_id' );
 466                         $this->addWhere( 'pr_page = il_from' );
 467                         $this->addWhereFld( 'pr_cascade', 1 );
 468                         $this->addWhereFld( 'il_to', $images );
 469
 470                         $res = $this->select( __METHOD__ );
 471                         while ( $row = $db->fetchObject( $res ) ) {
 472                                 $source = Title::makeTitle( $row->page_namespace, $row->page_title );
 473                                 $this->protections[NS_FILE][$row->il_to][] = array(
 474                                         'type' => $row->pr_type,
 475                                         'level' => $row->pr_level,
 476                                         'expiry' => Block::decodeExpiry( $row->pr_expiry, TS_ISO_8601 ),
 477                                         'source' => $source->getPrefixedText()
 478                                 );
 479                         }
 480                         $db->freeResult( $res );
 481                 }
 482         }
 483
 484         /**
 485          * Get talk page IDs (if requested) and subject page IDs (if requested)
 486          * and put them in $talkids and $subjectids
 487          */
 488         private function getTSIDs()
 489         {
 490                 $getTitles = $this->talkids = $this->subjectids = array();
 491                 $db = $this->getDB();
 492                 foreach ( $this->everything as $t )
 493                 {
 494                         if ( MWNamespace::isTalk( $t->getNamespace() ) )
 495                         {
 496                                 if ( $this->fld_subjectid )
 497                                         $getTitles[] = $t->getSubjectPage();
 498                         }
 499                         else if ( $this->fld_talkid )
 500                                 $getTitles[] = $t->getTalkPage();
 501                 }
 502                 if ( !count( $getTitles ) )
 503                         return;
 504
 505                 // Construct a custom WHERE clause that matches
 506                 // all titles in $getTitles
 507                 $lb = new LinkBatch( $getTitles );
 508                 $this->resetQueryParams();
 509                 $this->addTables( 'page' );
 510                 $this->addFields( array( 'page_title', 'page_namespace', 'page_id' ) );
 511                 $this->addWhere( $lb->constructSet( 'page', $db ) );
 512                 $res = $this->select( __METHOD__ );
 513                 while ( $row = $db->fetchObject( $res ) )
 514                 {
 515                         if ( MWNamespace::isTalk( $row->page_namespace ) )
 516                                 $this->talkids[MWNamespace::getSubject( $row->page_namespace )][$row->page_title] =
 517                                                 intval( $row->page_id );
 518                         else
 519                                 $this->subjectids[MWNamespace::getTalk( $row->page_namespace )][$row->page_title] =
 520                                                 intval( $row->page_id );
 521                 }
 522         }
 523
 524         /**
 525          * Get information about watched status and put it in $watched
 526          */
 527         private function getWatchedInfo()
 528         {
 529                 global $wgUser;
 530
 531                 if ( $wgUser->isAnon() || count( $this->titles ) == 0 )
 532                         return;
 533
 534                 $this->watched = array();
 535                 $db = $this->getDB();
 536
 537                 $lb = new LinkBatch( $this->titles );
 538
 539                 $this->resetQueryParams();
 540                 $this->addTables( array( 'page', 'watchlist' ) );
 541                 $this->addFields( array( 'page_title', 'page_namespace' ) );
 542                 $this->addWhere( array(
 543                         $lb->constructSet( 'page', $db ),
 544                         'wl_namespace=page_namespace',
 545                         'wl_title=page_title',
 546                         'wl_user' => $wgUser->getID()
 547                 ) );
 548
 549                 $res = $this->select( __METHOD__ );
 550
 551                 while ( $row = $db->fetchObject( $res ) ) {
 552                         $this->watched[$row->page_namespace][$row->page_title] = true;
 553                 }
 554         }
 555
 556         public function getAllowedParams() {
 557                 return array (
 558                         'prop' => array (
 559                                 ApiBase :: PARAM_DFLT => null,
 560                                 ApiBase :: PARAM_ISMULTI => true,
 561                                 ApiBase :: PARAM_TYPE => array (
 562                                         'protection',
 563                                         'talkid',
 564                                         'watched',
 565                                         'subjectid',
 566                                         'url',
 567                                         'readable',
 568                                         'preload'
 569                                 ) ),
 570                         'token' => array (
 571                                 ApiBase :: PARAM_DFLT => null,
 572                                 ApiBase :: PARAM_ISMULTI => true,
 573                                 ApiBase :: PARAM_TYPE => array_keys( $this->getTokenFunctions() )
 574                         ),
 575                         'continue' => null,
 576                 );
 577         }
 578
 579         public function getParamDescription() {
 580                 return array (
 581                         'prop' => array (
 582                                 'Which additional properties to get:',
 583                                 ' protection   - List the protection level of each page',
 584                                 ' talkid       - The page ID of the talk page for each non-talk page',
 585                                 ' watched      - List the watched status of each page',
 586                                 ' subjectid    - The page ID of the parent page for each talk page',
 587                                 ' url          - Gives a full URL to the page, and also an edit URL',
 588                                 ' readable     - Whether the user can read this page',
 589                                 ' preload      - Gives the text returned by EditFormPreloadText'
 590                         ),
 591                         'token' => 'Request a token to perform a data-modifying action on a page',
 592                         'continue' => 'When more results are available, use this to continue',
 593                 );
 594         }
 595
 596         public function getDescription() {
 597                 return 'Get basic page information such as namespace, title, last touched date, ...';
 598         }
 599
 600         public function getPossibleErrors() {
 601                 return array_merge( parent::getPossibleErrors(), array(
 602                         array( 'code' => '_badcontinue', 'info' => 'Invalid continue param. You should pass the original value returned by the previous query' ),
 603                 ) );
 604         }
 605
 606         protected function getExamples() {
 607                 return array (
 608                         'api.php?action=query&prop=info&titles=Main%20Page',
 609                         'api.php?action=query&prop=info&inprop=protection&titles=Main%20Page'
 610                 );
 611         }
 612
 613         public function getVersion() {
 614                 return __CLASS__ . ': $Id$';
 615         }
 616 }