includes/api/ApiComparePages.php

   1 <?php
   2 /**
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  17  * http://www.gnu.org/copyleft/gpl.html
  18  *
  19  * @file
  20  */
  21
  22 use MediaWiki\MediaWikiServices;
  23 use MediaWiki\Revision\MutableRevisionRecord;
  24 use MediaWiki\Revision\RevisionRecord;
  25 use MediaWiki\Revision\RevisionArchiveRecord;
  26 use MediaWiki\Revision\RevisionStore;
  27 use MediaWiki\Revision\SlotRecord;
  28
  29 class ApiComparePages extends ApiBase {
  30
  31         /** @var RevisionStore */
  32         private $revisionStore;
  33
  34         /** @var \MediaWiki\Revision\SlotRoleRegistry */
  35         private $slotRoleRegistry;
  36
  37         private $guessedTitle = false, $props;
  38
  39         public function __construct( ApiMain $mainModule, $moduleName, $modulePrefix = '' ) {
  40                 parent::__construct( $mainModule, $moduleName, $modulePrefix );
  41                 $this->revisionStore = MediaWikiServices::getInstance()->getRevisionStore();
  42                 $this->slotRoleRegistry = MediaWikiServices::getInstance()->getSlotRoleRegistry();
  43         }
  44
  45         public function execute() {
  46                 $params = $this->extractRequestParams();
  47
  48                 // Parameter validation
  49                 $this->requireAtLeastOneParameter(
  50                         $params, 'fromtitle', 'fromid', 'fromrev', 'fromtext', 'fromslots'
  51                 );
  52                 $this->requireAtLeastOneParameter(
  53                         $params, 'totitle', 'toid', 'torev', 'totext', 'torelative', 'toslots'
  54                 );
  55
  56                 $this->props = array_flip( $params['prop'] );
  57
  58                 // Cache responses publicly by default. This may be overridden later.
  59                 $this->getMain()->setCacheMode( 'public' );
  60
  61                 // Get the 'from' RevisionRecord
  62                 list( $fromRev, $fromRelRev, $fromValsRev ) = $this->getDiffRevision( 'from', $params );
  63
  64                 // Get the 'to' RevisionRecord
  65                 if ( $params['torelative'] !== null ) {
  66                         if ( !$fromRelRev ) {
  67                                 $this->dieWithError( 'apierror-compare-relative-to-nothing' );
  68                         }
  69                         if ( $params['torelative'] !== 'cur' && $fromRelRev instanceof RevisionArchiveRecord ) {
  70                                 // RevisionStore's getPreviousRevision/getNextRevision blow up
  71                                 // when passed an RevisionArchiveRecord for a deleted page
  72                                 $this->dieWithError( [ 'apierror-compare-relative-to-deleted', $params['torelative'] ] );
  73                         }
  74                         switch ( $params['torelative'] ) {
  75                                 case 'prev':
  76                                         // Swap 'from' and 'to'
  77                                         list( $toRev, $toRelRev, $toValsRev ) = [ $fromRev, $fromRelRev, $fromValsRev ];
  78                                         $fromRev = $this->revisionStore->getPreviousRevision( $toRelRev );
  79                                         $fromRelRev = $fromRev;
  80                                         $fromValsRev = $fromRev;
  81                                         if ( !$fromRev ) {
  82                                                 $title = Title::newFromLinkTarget( $toRelRev->getPageAsLinkTarget() );
  83                                                 $this->addWarning( [
  84                                                         'apiwarn-compare-no-prev',
  85                                                         wfEscapeWikiText( $title->getPrefixedText() ),
  86                                                         $toRelRev->getId()
  87                                                 ] );
  88
  89                                                 // (T203433) Create an empty dummy revision as the "previous".
  90                                                 // The main slot has to exist, the rest will be handled by DifferenceEngine.
  91                                                 $fromRev = $this->revisionStore->newMutableRevisionFromArray( [
  92                                                         'title' => $title ?: Title::makeTitle( NS_SPECIAL, 'Badtitle/' . __METHOD__ )
  93                                                 ] );
  94                                                 $fromRev->setContent(
  95                                                         SlotRecord::MAIN,
  96                                                         $toRelRev->getContent( SlotRecord::MAIN, RevisionRecord::RAW )
  97                                                                 ->getContentHandler()
  98                                                                 ->makeEmptyContent()
  99                                                 );
 100                                         }
 101                                         break;
 102
 103                                 case 'next':
 104                                         $toRev = $this->revisionStore->getNextRevision( $fromRelRev );
 105                                         $toRelRev = $toRev;
 106                                         $toValsRev = $toRev;
 107                                         if ( !$toRev ) {
 108                                                 $title = Title::newFromLinkTarget( $fromRelRev->getPageAsLinkTarget() );
 109                                                 $this->addWarning( [
 110                                                         'apiwarn-compare-no-next',
 111                                                         wfEscapeWikiText( $title->getPrefixedText() ),
 112                                                         $fromRelRev->getId()
 113                                                 ] );
 114
 115                                                 // (T203433) The web UI treats "next" as "cur" in this case.
 116                                                 // Avoid repeating metadata by making a MutableRevisionRecord with no changes.
 117                                                 $toRev = MutableRevisionRecord::newFromParentRevision( $fromRelRev );
 118                                         }
 119                                         break;
 120
 121                                 case 'cur':
 122                                         $title = $fromRelRev->getPageAsLinkTarget();
 123                                         $toRev = $this->revisionStore->getRevisionByTitle( $title );
 124                                         if ( !$toRev ) {
 125                                                 $title = Title::newFromLinkTarget( $title );
 126                                                 $this->dieWithError(
 127                                                         [ 'apierror-missingrev-title', wfEscapeWikiText( $title->getPrefixedText() ) ], 'nosuchrevid'
 128                                                 );
 129                                         }
 130                                         $toRelRev = $toRev;
 131                                         $toValsRev = $toRev;
 132                                         break;
 133                         }
 134                 } else {
 135                         list( $toRev, $toRelRev, $toValsRev ) = $this->getDiffRevision( 'to', $params );
 136                 }
 137
 138                 // Handle missing from or to revisions (should never happen)
 139                 // @codeCoverageIgnoreStart
 140                 if ( !$fromRev || !$toRev ) {
 141                         $this->dieWithError( 'apierror-baddiff' );
 142                 }
 143                 // @codeCoverageIgnoreEnd
 144
 145                 // Handle revdel
 146                 if ( !$fromRev->audienceCan(
 147                         RevisionRecord::DELETED_TEXT, RevisionRecord::FOR_THIS_USER, $this->getUser()
 148                 ) ) {
 149                         $this->dieWithError( [ 'apierror-missingcontent-revid', $fromRev->getId() ], 'missingcontent' );
 150                 }
 151                 if ( !$toRev->audienceCan(
 152                         RevisionRecord::DELETED_TEXT, RevisionRecord::FOR_THIS_USER, $this->getUser()
 153                 ) ) {
 154                         $this->dieWithError( [ 'apierror-missingcontent-revid', $toRev->getId() ], 'missingcontent' );
 155                 }
 156
 157                 // Get the diff
 158                 $context = new DerivativeContext( $this->getContext() );
 159                 if ( $fromRelRev && $fromRelRev->getPageAsLinkTarget() ) {
 160                         $context->setTitle( Title::newFromLinkTarget( $fromRelRev->getPageAsLinkTarget() ) );
 161                 } elseif ( $toRelRev && $toRelRev->getPageAsLinkTarget() ) {
 162                         $context->setTitle( Title::newFromLinkTarget( $toRelRev->getPageAsLinkTarget() ) );
 163                 } else {
 164                         $guessedTitle = $this->guessTitle();
 165                         if ( $guessedTitle ) {
 166                                 $context->setTitle( $guessedTitle );
 167                         }
 168                 }
 169                 $de = new DifferenceEngine( $context );
 170                 $de->setRevisions( $fromRev, $toRev );
 171                 if ( $params['slots'] === null ) {
 172                         $difftext = $de->getDiffBody();
 173                         if ( $difftext === false ) {
 174                                 $this->dieWithError( 'apierror-baddiff' );
 175                         }
 176                 } else {
 177                         $difftext = [];
 178                         foreach ( $params['slots'] as $role ) {
 179                                 $difftext[$role] = $de->getDiffBodyForRole( $role );
 180                         }
 181                 }
 182
 183                 // Fill in the response
 184                 $vals = [];
 185                 $this->setVals( $vals, 'from', $fromValsRev );
 186                 $this->setVals( $vals, 'to', $toValsRev );
 187
 188                 if ( isset( $this->props['rel'] ) ) {
 189                         if ( !$fromRev instanceof MutableRevisionRecord ) {
 190                                 $rev = $this->revisionStore->getPreviousRevision( $fromRev );
 191                                 if ( $rev ) {
 192                                         $vals['prev'] = $rev->getId();
 193                                 }
 194                         }
 195                         if ( !$toRev instanceof MutableRevisionRecord ) {
 196                                 $rev = $this->revisionStore->getNextRevision( $toRev );
 197                                 if ( $rev ) {
 198                                         $vals['next'] = $rev->getId();
 199                                 }
 200                         }
 201                 }
 202
 203                 if ( isset( $this->props['diffsize'] ) ) {
 204                         $vals['diffsize'] = 0;
 205                         foreach ( (array)$difftext as $text ) {
 206                                 $vals['diffsize'] += strlen( $text );
 207                         }
 208                 }
 209                 if ( isset( $this->props['diff'] ) ) {
 210                         if ( is_array( $difftext ) ) {
 211                                 ApiResult::setArrayType( $difftext, 'kvp', 'diff' );
 212                                 $vals['bodies'] = $difftext;
 213                         } else {
 214                                 ApiResult::setContentValue( $vals, 'body', $difftext );
 215                         }
 216                 }
 217
 218                 // Diffs can be really big and there's little point in having
 219                 // ApiResult truncate it to an empty response since the diff is the
 220                 // whole reason this module exists. So pass NO_SIZE_CHECK here.
 221                 $this->getResult()->addValue( null, $this->getModuleName(), $vals, ApiResult::NO_SIZE_CHECK );
 222         }
 223
 224         /**
 225          * Load a revision by ID
 226          *
 227          * Falls back to checking the archive table if appropriate.
 228          *
 229          * @param int $id
 230          * @return RevisionRecord|null
 231          */
 232         private function getRevisionById( $id ) {
 233                 $rev = $this->revisionStore->getRevisionById( $id );
 234                 if ( !$rev && $this->getPermissionManager()
 235                                 ->userHasAnyRight( $this->getUser(), 'deletedtext', 'undelete' )
 236                 ) {
 237                         // Try the 'archive' table
 238                         $arQuery = $this->revisionStore->getArchiveQueryInfo();
 239                         $row = $this->getDB()->selectRow(
 240                                 $arQuery['tables'],
 241                                 array_merge(
 242                                         $arQuery['fields'],
 243                                         [ 'ar_namespace', 'ar_title' ]
 244                                 ),
 245                                 [ 'ar_rev_id' => $id ],
 246                                 __METHOD__,
 247                                 [],
 248                                 $arQuery['joins']
 249                         );
 250                         if ( $row ) {
 251                                 $rev = $this->revisionStore->newRevisionFromArchiveRow( $row );
 252                                 $rev->isArchive = true;
 253                         }
 254                 }
 255                 return $rev;
 256         }
 257
 258         /**
 259          * Guess an appropriate default Title for this request
 260          *
 261          * @return Title|null
 262          */
 263         private function guessTitle() {
 264                 if ( $this->guessedTitle !== false ) {
 265                         return $this->guessedTitle;
 266                 }
 267
 268                 $this->guessedTitle = null;
 269                 $params = $this->extractRequestParams();
 270
 271                 foreach ( [ 'from', 'to' ] as $prefix ) {
 272                         if ( $params["{$prefix}rev"] !== null ) {
 273                                 $rev = $this->getRevisionById( $params["{$prefix}rev"] );
 274                                 if ( $rev ) {
 275                                         $this->guessedTitle = Title::newFromLinkTarget( $rev->getPageAsLinkTarget() );
 276                                         break;
 277                                 }
 278                         }
 279
 280                         if ( $params["{$prefix}title"] !== null ) {
 281                                 $title = Title::newFromText( $params["{$prefix}title"] );
 282                                 if ( $title && !$title->isExternal() ) {
 283                                         $this->guessedTitle = $title;
 284                                         break;
 285                                 }
 286                         }
 287
 288                         if ( $params["{$prefix}id"] !== null ) {
 289                                 $title = Title::newFromID( $params["{$prefix}id"] );
 290                                 if ( $title ) {
 291                                         $this->guessedTitle = $title;
 292                                         break;
 293                                 }
 294                         }
 295                 }
 296
 297                 return $this->guessedTitle;
 298         }
 299
 300         /**
 301          * Guess an appropriate default content model for this request
 302          * @param string $role Slot for which to guess the model
 303          * @return string|null Guessed content model
 304          */
 305         private function guessModel( $role ) {
 306                 $params = $this->extractRequestParams();
 307
 308                 $title = null;
 309                 foreach ( [ 'from', 'to' ] as $prefix ) {
 310                         if ( $params["{$prefix}rev"] !== null ) {
 311                                 $rev = $this->getRevisionById( $params["{$prefix}rev"] );
 312                                 if ( $rev && $rev->hasSlot( $role ) ) {
 313                                         return $rev->getSlot( $role, RevisionRecord::RAW )->getModel();
 314                                 }
 315                         }
 316                 }
 317
 318                 $guessedTitle = $this->guessTitle();
 319                 if ( $guessedTitle ) {
 320                         return $this->slotRoleRegistry->getRoleHandler( $role )->getDefaultModel( $guessedTitle );
 321                 }
 322
 323                 if ( isset( $params["fromcontentmodel-$role"] ) ) {
 324                         return $params["fromcontentmodel-$role"];
 325                 }
 326                 if ( isset( $params["tocontentmodel-$role"] ) ) {
 327                         return $params["tocontentmodel-$role"];
 328                 }
 329
 330                 if ( $role === SlotRecord::MAIN ) {
 331                         if ( isset( $params['fromcontentmodel'] ) ) {
 332                                 return $params['fromcontentmodel'];
 333                         }
 334                         if ( isset( $params['tocontentmodel'] ) ) {
 335                                 return $params['tocontentmodel'];
 336                         }
 337                 }
 338
 339                 return null;
 340         }
 341
 342         /**
 343          * Get the RevisionRecord for one side of the diff
 344          *
 345          * This uses the appropriate set of parameters to determine what content
 346          * should be diffed.
 347          *
 348          * Returns three values:
 349          * - A RevisionRecord holding the content
 350          * - The revision specified, if any, even if content was supplied
 351          * - The revision to pass to setVals(), if any
 352          *
 353          * @param string $prefix 'from' or 'to'
 354          * @param array $params
 355          * @return array [ RevisionRecord|null, RevisionRecord|null, RevisionRecord|null ]
 356          */
 357         private function getDiffRevision( $prefix, array $params ) {
 358                 // Back compat params
 359                 $this->requireMaxOneParameter( $params, "{$prefix}text", "{$prefix}slots" );
 360                 $this->requireMaxOneParameter( $params, "{$prefix}section", "{$prefix}slots" );
 361                 if ( $params["{$prefix}text"] !== null ) {
 362                         $params["{$prefix}slots"] = [ SlotRecord::MAIN ];
 363                         $params["{$prefix}text-main"] = $params["{$prefix}text"];
 364                         $params["{$prefix}section-main"] = null;
 365                         $params["{$prefix}contentmodel-main"] = $params["{$prefix}contentmodel"];
 366                         $params["{$prefix}contentformat-main"] = $params["{$prefix}contentformat"];
 367                 }
 368
 369                 $title = null;
 370                 $rev = null;
 371                 $suppliedContent = $params["{$prefix}slots"] !== null;
 372
 373                 // Get the revision and title, if applicable
 374                 $revId = null;
 375                 if ( $params["{$prefix}rev"] !== null ) {
 376                         $revId = $params["{$prefix}rev"];
 377                 } elseif ( $params["{$prefix}title"] !== null || $params["{$prefix}id"] !== null ) {
 378                         if ( $params["{$prefix}title"] !== null ) {
 379                                 $title = Title::newFromText( $params["{$prefix}title"] );
 380                                 if ( !$title || $title->isExternal() ) {
 381                                         $this->dieWithError(
 382                                                 [ 'apierror-invalidtitle', wfEscapeWikiText( $params["{$prefix}title"] ) ]
 383                                         );
 384                                 }
 385                         } else {
 386                                 $title = Title::newFromID( $params["{$prefix}id"] );
 387                                 if ( !$title ) {
 388                                         $this->dieWithError( [ 'apierror-nosuchpageid', $params["{$prefix}id"] ] );
 389                                 }
 390                         }
 391                         $revId = $title->getLatestRevID();
 392                         if ( !$revId ) {
 393                                 $revId = null;
 394                                 // Only die here if we're not using supplied text
 395                                 if ( !$suppliedContent ) {
 396                                         if ( $title->exists() ) {
 397                                                 $this->dieWithError(
 398                                                         [ 'apierror-missingrev-title', wfEscapeWikiText( $title->getPrefixedText() ) ], 'nosuchrevid'
 399                                                 );
 400                                         } else {
 401                                                 $this->dieWithError(
 402                                                         [ 'apierror-missingtitle-byname', wfEscapeWikiText( $title->getPrefixedText() ) ],
 403                                                         'missingtitle'
 404                                                 );
 405                                         }
 406                                 }
 407                         }
 408                 }
 409                 if ( $revId !== null ) {
 410                         $rev = $this->getRevisionById( $revId );
 411                         if ( !$rev ) {
 412                                 $this->dieWithError( [ 'apierror-nosuchrevid', $revId ] );
 413                         }
 414                         $title = Title::newFromLinkTarget( $rev->getPageAsLinkTarget() );
 415
 416                         // If we don't have supplied content, return here. Otherwise,
 417                         // continue on below with the supplied content.
 418                         if ( !$suppliedContent ) {
 419                                 $newRev = $rev;
 420
 421                                 // Deprecated 'fromsection'/'tosection'
 422                                 if ( isset( $params["{$prefix}section"] ) ) {
 423                                         $section = $params["{$prefix}section"];
 424                                         $newRev = MutableRevisionRecord::newFromParentRevision( $rev );
 425                                         $content = $rev->getContent( SlotRecord::MAIN, RevisionRecord::FOR_THIS_USER,
 426                                                 $this->getUser() );
 427                                         if ( !$content ) {
 428                                                 $this->dieWithError(
 429                                                         [ 'apierror-missingcontent-revid-role', $rev->getId(), SlotRecord::MAIN ], 'missingcontent'
 430                                                 );
 431                                         }
 432                                         $content = $content ? $content->getSection( $section ) : null;
 433                                         if ( !$content ) {
 434                                                 $this->dieWithError(
 435                                                         [ "apierror-compare-nosuch{$prefix}section", wfEscapeWikiText( $section ) ],
 436                                                         "nosuch{$prefix}section"
 437                                                 );
 438                                         }
 439                                         $newRev->setContent( SlotRecord::MAIN, $content );
 440                                 }
 441
 442                                 return [ $newRev, $rev, $rev ];
 443                         }
 444                 }
 445
 446                 // Override $content based on supplied text
 447                 if ( !$title ) {
 448                         $title = $this->guessTitle();
 449                 }
 450                 if ( $rev ) {
 451                         $newRev = MutableRevisionRecord::newFromParentRevision( $rev );
 452                 } else {
 453                         $newRev = $this->revisionStore->newMutableRevisionFromArray( [
 454                                 'title' => $title ?: Title::makeTitle( NS_SPECIAL, 'Badtitle/' . __METHOD__ )
 455                         ] );
 456                 }
 457                 foreach ( $params["{$prefix}slots"] as $role ) {
 458                         $text = $params["{$prefix}text-{$role}"];
 459                         if ( $text === null ) {
 460                                 // The SlotRecord::MAIN role can't be deleted
 461                                 if ( $role === SlotRecord::MAIN ) {
 462                                         $this->dieWithError( [ 'apierror-compare-maintextrequired', $prefix ] );
 463                                 }
 464
 465                                 // These parameters make no sense without text. Reject them to avoid
 466                                 // confusion.
 467                                 foreach ( [ 'section', 'contentmodel', 'contentformat' ] as $param ) {
 468                                         if ( isset( $params["{$prefix}{$param}-{$role}"] ) ) {
 469                                                 $this->dieWithError( [
 470                                                         'apierror-compare-notext',
 471                                                         wfEscapeWikiText( "{$prefix}{$param}-{$role}" ),
 472                                                         wfEscapeWikiText( "{$prefix}text-{$role}" ),
 473                                                 ] );
 474                                         }
 475                                 }
 476
 477                                 $newRev->removeSlot( $role );
 478                                 continue;
 479                         }
 480
 481                         $model = $params["{$prefix}contentmodel-{$role}"];
 482                         $format = $params["{$prefix}contentformat-{$role}"];
 483
 484                         if ( !$model && $rev && $rev->hasSlot( $role ) ) {
 485                                 $model = $rev->getSlot( $role, RevisionRecord::RAW )->getModel();
 486                         }
 487                         if ( !$model && $title && $role === SlotRecord::MAIN ) {
 488                                 // @todo: Use SlotRoleRegistry and do this for all slots
 489                                 $model = $title->getContentModel();
 490                         }
 491                         if ( !$model ) {
 492                                 $model = $this->guessModel( $role );
 493                         }
 494                         if ( !$model ) {
 495                                 $model = CONTENT_MODEL_WIKITEXT;
 496                                 $this->addWarning( [ 'apiwarn-compare-nocontentmodel', $model ] );
 497                         }
 498
 499                         try {
 500                                 $content = ContentHandler::makeContent( $text, $title, $model, $format );
 501                         } catch ( MWContentSerializationException $ex ) {
 502                                 $this->dieWithException( $ex, [
 503                                         'wrap' => ApiMessage::create( 'apierror-contentserializationexception', 'parseerror' )
 504                                 ] );
 505                         }
 506
 507                         if ( $params["{$prefix}pst"] ) {
 508                                 if ( !$title ) {
 509                                         $this->dieWithError( 'apierror-compare-no-title' );
 510                                 }
 511                                 $popts = ParserOptions::newFromContext( $this->getContext() );
 512                                 $content = $content->preSaveTransform( $title, $this->getUser(), $popts );
 513                         }
 514
 515                         $section = $params["{$prefix}section-{$role}"];
 516                         if ( $section !== null && $section !== '' ) {
 517                                 if ( !$rev ) {
 518                                         $this->dieWithError( "apierror-compare-no{$prefix}revision" );
 519                                 }
 520                                 $oldContent = $rev->getContent( $role, RevisionRecord::FOR_THIS_USER, $this->getUser() );
 521                                 if ( !$oldContent ) {
 522                                         $this->dieWithError(
 523                                                 [ 'apierror-missingcontent-revid-role', $rev->getId(), wfEscapeWikiText( $role ) ],
 524                                                 'missingcontent'
 525                                         );
 526                                 }
 527                                 if ( !$oldContent->getContentHandler()->supportsSections() ) {
 528                                         $this->dieWithError( [ 'apierror-sectionsnotsupported', $content->getModel() ] );
 529                                 }
 530                                 try {
 531                                         $content = $oldContent->replaceSection( $section, $content, '' );
 532                                 } catch ( Exception $ex ) {
 533                                         // Probably a content model mismatch.
 534                                         $content = null;
 535                                 }
 536                                 if ( !$content ) {
 537                                         $this->dieWithError( [ 'apierror-sectionreplacefailed' ] );
 538                                 }
 539                         }
 540
 541                         // Deprecated 'fromsection'/'tosection'
 542                         if ( $role === SlotRecord::MAIN && isset( $params["{$prefix}section"] ) ) {
 543                                 $section = $params["{$prefix}section"];
 544                                 $content = $content->getSection( $section );
 545                                 if ( !$content ) {
 546                                         $this->dieWithError(
 547                                                 [ "apierror-compare-nosuch{$prefix}section", wfEscapeWikiText( $section ) ],
 548                                                 "nosuch{$prefix}section"
 549                                         );
 550                                 }
 551                         }
 552
 553                         $newRev->setContent( $role, $content );
 554                 }
 555                 return [ $newRev, $rev, null ];
 556         }
 557
 558         /**
 559          * Set value fields from a RevisionRecord object
 560          *
 561          * @param array &$vals Result array to set data into
 562          * @param string $prefix 'from' or 'to'
 563          * @param RevisionRecord|null $rev
 564          */
 565         private function setVals( &$vals, $prefix, $rev ) {
 566                 if ( $rev ) {
 567                         $title = Title::newFromLinkTarget( $rev->getPageAsLinkTarget() );
 568                         if ( isset( $this->props['ids'] ) ) {
 569                                 $vals["{$prefix}id"] = $title->getArticleID();
 570                                 $vals["{$prefix}revid"] = $rev->getId();
 571                         }
 572                         if ( isset( $this->props['title'] ) ) {
 573                                 ApiQueryBase::addTitleInfo( $vals, $title, $prefix );
 574                         }
 575                         if ( isset( $this->props['size'] ) ) {
 576                                 $vals["{$prefix}size"] = $rev->getSize();
 577                         }
 578
 579                         $anyHidden = false;
 580                         if ( $rev->isDeleted( RevisionRecord::DELETED_TEXT ) ) {
 581                                 $vals["{$prefix}texthidden"] = true;
 582                                 $anyHidden = true;
 583                         }
 584
 585                         if ( $rev->isDeleted( RevisionRecord::DELETED_USER ) ) {
 586                                 $vals["{$prefix}userhidden"] = true;
 587                                 $anyHidden = true;
 588                         }
 589                         if ( isset( $this->props['user'] ) ) {
 590                                 $user = $rev->getUser( RevisionRecord::FOR_THIS_USER, $this->getUser() );
 591                                 if ( $user ) {
 592                                         $vals["{$prefix}user"] = $user->getName();
 593                                         $vals["{$prefix}userid"] = $user->getId();
 594                                 }
 595                         }
 596
 597                         if ( $rev->isDeleted( RevisionRecord::DELETED_COMMENT ) ) {
 598                                 $vals["{$prefix}commenthidden"] = true;
 599                                 $anyHidden = true;
 600                         }
 601                         if ( isset( $this->props['comment'] ) || isset( $this->props['parsedcomment'] ) ) {
 602                                 $comment = $rev->getComment( RevisionRecord::FOR_THIS_USER, $this->getUser() );
 603                                 if ( $comment !== null ) {
 604                                         if ( isset( $this->props['comment'] ) ) {
 605                                                 $vals["{$prefix}comment"] = $comment->text;
 606                                         }
 607                                         $vals["{$prefix}parsedcomment"] = Linker::formatComment(
 608                                                 $comment->text, $title
 609                                         );
 610                                 }
 611                         }
 612
 613                         if ( $anyHidden ) {
 614                                 $this->getMain()->setCacheMode( 'private' );
 615                                 if ( $rev->isDeleted( RevisionRecord::DELETED_RESTRICTED ) ) {
 616                                         $vals["{$prefix}suppressed"] = true;
 617                                 }
 618                         }
 619
 620                         if ( !empty( $rev->isArchive ) ) {
 621                                 $this->getMain()->setCacheMode( 'private' );
 622                                 $vals["{$prefix}archive"] = true;
 623                         }
 624                 }
 625         }
 626
 627         public function getAllowedParams() {
 628                 $slotRoles = $this->slotRoleRegistry->getKnownRoles();
 629                 sort( $slotRoles, SORT_STRING );
 630
 631                 // Parameters for the 'from' and 'to' content
 632                 $fromToParams = [
 633                         'title' => null,
 634                         'id' => [
 635                                 ApiBase::PARAM_TYPE => 'integer'
 636                         ],
 637                         'rev' => [
 638                                 ApiBase::PARAM_TYPE => 'integer'
 639                         ],
 640
 641                         'slots' => [
 642                                 ApiBase::PARAM_TYPE => $slotRoles,
 643                                 ApiBase::PARAM_ISMULTI => true,
 644                         ],
 645                         'text-{slot}' => [
 646                                 ApiBase::PARAM_TEMPLATE_VARS => [ 'slot' => 'slots' ], // fixed below
 647                                 ApiBase::PARAM_TYPE => 'text',
 648                         ],
 649                         'section-{slot}' => [
 650                                 ApiBase::PARAM_TEMPLATE_VARS => [ 'slot' => 'slots' ], // fixed below
 651                                 ApiBase::PARAM_TYPE => 'string',
 652                         ],
 653                         'contentformat-{slot}' => [
 654                                 ApiBase::PARAM_TEMPLATE_VARS => [ 'slot' => 'slots' ], // fixed below
 655                                 ApiBase::PARAM_TYPE => ContentHandler::getAllContentFormats(),
 656                         ],
 657                         'contentmodel-{slot}' => [
 658                                 ApiBase::PARAM_TEMPLATE_VARS => [ 'slot' => 'slots' ], // fixed below
 659                                 ApiBase::PARAM_TYPE => ContentHandler::getContentModels(),
 660                         ],
 661                         'pst' => false,
 662
 663                         'text' => [
 664                                 ApiBase::PARAM_TYPE => 'text',
 665                                 ApiBase::PARAM_DEPRECATED => true,
 666                         ],
 667                         'contentformat' => [
 668                                 ApiBase::PARAM_TYPE => ContentHandler::getAllContentFormats(),
 669                                 ApiBase::PARAM_DEPRECATED => true,
 670                         ],
 671                         'contentmodel' => [
 672                                 ApiBase::PARAM_TYPE => ContentHandler::getContentModels(),
 673                                 ApiBase::PARAM_DEPRECATED => true,
 674                         ],
 675                         'section' => [
 676                                 ApiBase::PARAM_DFLT => null,
 677                                 ApiBase::PARAM_DEPRECATED => true,
 678                         ],
 679                 ];
 680
 681                 $ret = [];
 682                 foreach ( $fromToParams as $k => $v ) {
 683                         if ( isset( $v[ApiBase::PARAM_TEMPLATE_VARS]['slot'] ) ) {
 684                                 $v[ApiBase::PARAM_TEMPLATE_VARS]['slot'] = 'fromslots';
 685                         }
 686                         $ret["from$k"] = $v;
 687                 }
 688                 foreach ( $fromToParams as $k => $v ) {
 689                         if ( isset( $v[ApiBase::PARAM_TEMPLATE_VARS]['slot'] ) ) {
 690                                 $v[ApiBase::PARAM_TEMPLATE_VARS]['slot'] = 'toslots';
 691                         }
 692                         $ret["to$k"] = $v;
 693                 }
 694
 695                 $ret = wfArrayInsertAfter(
 696                         $ret,
 697                         [ 'torelative' => [ ApiBase::PARAM_TYPE => [ 'prev', 'next', 'cur' ], ] ],
 698                         'torev'
 699                 );
 700
 701                 $ret['prop'] = [
 702                         ApiBase::PARAM_DFLT => 'diff|ids|title',
 703                         ApiBase::PARAM_TYPE => [
 704                                 'diff',
 705                                 'diffsize',
 706                                 'rel',
 707                                 'ids',
 708                                 'title',
 709                                 'user',
 710                                 'comment',
 711                                 'parsedcomment',
 712                                 'size',
 713                         ],
 714                         ApiBase::PARAM_ISMULTI => true,
 715                         ApiBase::PARAM_HELP_MSG_PER_VALUE => [],
 716                 ];
 717
 718                 $ret['slots'] = [
 719                         ApiBase::PARAM_TYPE => $slotRoles,
 720                         ApiBase::PARAM_ISMULTI => true,
 721                         ApiBase::PARAM_ALL => true,
 722                 ];
 723
 724                 return $ret;
 725         }
 726
 727         protected function getExamplesMessages() {
 728                 return [
 729                         'action=compare&fromrev=1&torev=2'
 730                                 => 'apihelp-compare-example-1',
 731                 ];
 732         }
 733 }