includes/EditPage.php

   1 <?php
   2 /**
   3  * User interface for page editing.
   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  */
  22
  23 use MediaWiki\Logger\LoggerFactory;
  24
  25 /**
  26  * The edit page/HTML interface (split from Article)
  27  * The actual database and text munging is still in Article,
  28  * but it should get easier to call those from alternate
  29  * interfaces.
  30  *
  31  * EditPage cares about two distinct titles:
  32  * $this->mContextTitle is the page that forms submit to, links point to,
  33  * redirects go to, etc. $this->mTitle (as well as $mArticle) is the
  34  * page in the database that is actually being edited. These are
  35  * usually the same, but they are now allowed to be different.
  36  *
  37  * Surgeon General's Warning: prolonged exposure to this class is known to cause
  38  * headaches, which may be fatal.
  39  */
  40 class EditPage {
  41         /**
  42          * Status: Article successfully updated
  43          */
  44         const AS_SUCCESS_UPDATE = 200;
  45
  46         /**
  47          * Status: Article successfully created
  48          */
  49         const AS_SUCCESS_NEW_ARTICLE = 201;
  50
  51         /**
  52          * Status: Article update aborted by a hook function
  53          */
  54         const AS_HOOK_ERROR = 210;
  55
  56         /**
  57          * Status: A hook function returned an error
  58          */
  59         const AS_HOOK_ERROR_EXPECTED = 212;
  60
  61         /**
  62          * Status: User is blocked from editing this page
  63          */
  64         const AS_BLOCKED_PAGE_FOR_USER = 215;
  65
  66         /**
  67          * Status: Content too big (> $wgMaxArticleSize)
  68          */
  69         const AS_CONTENT_TOO_BIG = 216;
  70
  71         /**
  72          * Status: this anonymous user is not allowed to edit this page
  73          */
  74         const AS_READ_ONLY_PAGE_ANON = 218;
  75
  76         /**
  77          * Status: this logged in user is not allowed to edit this page
  78          */
  79         const AS_READ_ONLY_PAGE_LOGGED = 219;
  80
  81         /**
  82          * Status: wiki is in readonly mode (wfReadOnly() == true)
  83          */
  84         const AS_READ_ONLY_PAGE = 220;
  85
  86         /**
  87          * Status: rate limiter for action 'edit' was tripped
  88          */
  89         const AS_RATE_LIMITED = 221;
  90
  91         /**
  92          * Status: article was deleted while editing and param wpRecreate == false or form
  93          * was not posted
  94          */
  95         const AS_ARTICLE_WAS_DELETED = 222;
  96
  97         /**
  98          * Status: user tried to create this page, but is not allowed to do that
  99          * ( Title->userCan('create') == false )
 100          */
 101         const AS_NO_CREATE_PERMISSION = 223;
 102
 103         /**
 104          * Status: user tried to create a blank page and wpIgnoreBlankArticle == false
 105          */
 106         const AS_BLANK_ARTICLE = 224;
 107
 108         /**
 109          * Status: (non-resolvable) edit conflict
 110          */
 111         const AS_CONFLICT_DETECTED = 225;
 112
 113         /**
 114          * Status: no edit summary given and the user has forceeditsummary set and the user is not
 115          * editing in his own userspace or talkspace and wpIgnoreBlankSummary == false
 116          */
 117         const AS_SUMMARY_NEEDED = 226;
 118
 119         /**
 120          * Status: user tried to create a new section without content
 121          */
 122         const AS_TEXTBOX_EMPTY = 228;
 123
 124         /**
 125          * Status: article is too big (> $wgMaxArticleSize), after merging in the new section
 126          */
 127         const AS_MAX_ARTICLE_SIZE_EXCEEDED = 229;
 128
 129         /**
 130          * Status: WikiPage::doEdit() was unsuccessful
 131          */
 132         const AS_END = 231;
 133
 134         /**
 135          * Status: summary contained spam according to one of the regexes in $wgSummarySpamRegex
 136          */
 137         const AS_SPAM_ERROR = 232;
 138
 139         /**
 140          * Status: anonymous user is not allowed to upload (User::isAllowed('upload') == false)
 141          */
 142         const AS_IMAGE_REDIRECT_ANON = 233;
 143
 144         /**
 145          * Status: logged in user is not allowed to upload (User::isAllowed('upload') == false)
 146          */
 147         const AS_IMAGE_REDIRECT_LOGGED = 234;
 148
 149         /**
 150          * Status: user tried to modify the content model, but is not allowed to do that
 151          * ( User::isAllowed('editcontentmodel') == false )
 152          */
 153         const AS_NO_CHANGE_CONTENT_MODEL = 235;
 154
 155         /**
 156          * Status: user tried to create self-redirect (redirect to the same article) and
 157          * wpIgnoreSelfRedirect == false
 158          */
 159         const AS_SELF_REDIRECT = 236;
 160
 161         /**
 162          * Status: an error relating to change tagging. Look at the message key for
 163          * more details
 164          */
 165         const AS_CHANGE_TAG_ERROR = 237;
 166
 167         /**
 168          * Status: can't parse content
 169          */
 170         const AS_PARSE_ERROR = 240;
 171
 172         /**
 173          * Status: when changing the content model is disallowed due to
 174          * $wgContentHandlerUseDB being false
 175          */
 176         const AS_CANNOT_USE_CUSTOM_MODEL = 241;
 177
 178         /**
 179          * HTML id and name for the beginning of the edit form.
 180          */
 181         const EDITFORM_ID = 'editform';
 182
 183         /**
 184          * Prefix of key for cookie used to pass post-edit state.
 185          * The revision id edited is added after this
 186          */
 187         const POST_EDIT_COOKIE_KEY_PREFIX = 'PostEditRevision';
 188
 189         /**
 190          * Duration of PostEdit cookie, in seconds.
 191          * The cookie will be removed instantly if the JavaScript runs.
 192          *
 193          * Otherwise, though, we don't want the cookies to accumulate.
 194          * RFC 2109 ( https://www.ietf.org/rfc/rfc2109.txt ) specifies a possible
 195          * limit of only 20 cookies per domain. This still applies at least to some
 196          * versions of IE without full updates:
 197          * https://blogs.msdn.com/b/ieinternals/archive/2009/08/20/wininet-ie-cookie-internals-faq.aspx
 198          *
 199          * A value of 20 minutes should be enough to take into account slow loads and minor
 200          * clock skew while still avoiding cookie accumulation when JavaScript is turned off.
 201          */
 202         const POST_EDIT_COOKIE_DURATION = 1200;
 203
 204         /** @var Article */
 205         public $mArticle;
 206         /** @var WikiPage */
 207         private $page;
 208
 209         /** @var Title */
 210         public $mTitle;
 211
 212         /** @var null|Title */
 213         private $mContextTitle = null;
 214
 215         /** @var string */
 216         public $action = 'submit';
 217
 218         /** @var bool */
 219         public $isConflict = false;
 220
 221         /** @var bool */
 222         public $isCssJsSubpage = false;
 223
 224         /** @var bool */
 225         public $isCssSubpage = false;
 226
 227         /** @var bool */
 228         public $isJsSubpage = false;
 229
 230         /** @var bool */
 231         public $isWrongCaseCssJsPage = false;
 232
 233         /** @var bool New page or new section */
 234         public $isNew = false;
 235
 236         /** @var bool */
 237         public $deletedSinceEdit;
 238
 239         /** @var string */
 240         public $formtype;
 241
 242         /** @var bool */
 243         public $firsttime;
 244
 245         /** @var bool|stdClass */
 246         public $lastDelete;
 247
 248         /** @var bool */
 249         public $mTokenOk = false;
 250
 251         /** @var bool */
 252         public $mTokenOkExceptSuffix = false;
 253
 254         /** @var bool */
 255         public $mTriedSave = false;
 256
 257         /** @var bool */
 258         public $incompleteForm = false;
 259
 260         /** @var bool */
 261         public $tooBig = false;
 262
 263         /** @var bool */
 264         public $missingComment = false;
 265
 266         /** @var bool */
 267         public $missingSummary = false;
 268
 269         /** @var bool */
 270         public $allowBlankSummary = false;
 271
 272         /** @var bool */
 273         protected $blankArticle = false;
 274
 275         /** @var bool */
 276         protected $allowBlankArticle = false;
 277
 278         /** @var bool */
 279         protected $selfRedirect = false;
 280
 281         /** @var bool */
 282         protected $allowSelfRedirect = false;
 283
 284         /** @var string */
 285         public $autoSumm = '';
 286
 287         /** @var string */
 288         public $hookError = '';
 289
 290         /** @var ParserOutput */
 291         public $mParserOutput;
 292
 293         /** @var bool Has a summary been preset using GET parameter &summary= ? */
 294         public $hasPresetSummary = false;
 295
 296         /** @var bool */
 297         public $mBaseRevision = false;
 298
 299         /** @var bool */
 300         public $mShowSummaryField = true;
 301
 302         # Form values
 303
 304         /** @var bool */
 305         public $save = false;
 306
 307         /** @var bool */
 308         public $preview = false;
 309
 310         /** @var bool */
 311         public $diff = false;
 312
 313         /** @var bool */
 314         public $minoredit = false;
 315
 316         /** @var bool */
 317         public $watchthis = false;
 318
 319         /** @var bool */
 320         public $recreate = false;
 321
 322         /** @var string */
 323         public $textbox1 = '';
 324
 325         /** @var string */
 326         public $textbox2 = '';
 327
 328         /** @var string */
 329         public $summary = '';
 330
 331         /** @var bool */
 332         public $nosummary = false;
 333
 334         /** @var string */
 335         public $edittime = '';
 336
 337         /** @var integer */
 338         private $editRevId = null;
 339
 340         /** @var string */
 341         public $section = '';
 342
 343         /** @var string */
 344         public $sectiontitle = '';
 345
 346         /** @var string */
 347         public $starttime = '';
 348
 349         /** @var int */
 350         public $oldid = 0;
 351
 352         /** @var int */
 353         public $parentRevId = 0;
 354
 355         /** @var string */
 356         public $editintro = '';
 357
 358         /** @var null */
 359         public $scrolltop = null;
 360
 361         /** @var bool */
 362         public $bot = true;
 363
 364         /** @var null|string */
 365         public $contentModel = null;
 366
 367         /** @var null|string */
 368         public $contentFormat = null;
 369
 370         /** @var null|array */
 371         private $changeTags = null;
 372
 373         # Placeholders for text injection by hooks (must be HTML)
 374         # extensions should take care to _append_ to the present value
 375
 376         /** @var string Before even the preview */
 377         public $editFormPageTop = '';
 378         public $editFormTextTop = '';
 379         public $editFormTextBeforeContent = '';
 380         public $editFormTextAfterWarn = '';
 381         public $editFormTextAfterTools = '';
 382         public $editFormTextBottom = '';
 383         public $editFormTextAfterContent = '';
 384         public $previewTextAfterContent = '';
 385         public $mPreloadContent = null;
 386
 387         /* $didSave should be set to true whenever an article was successfully altered. */
 388         public $didSave = false;
 389         public $undidRev = 0;
 390
 391         public $suppressIntro = false;
 392
 393         /** @var bool */
 394         protected $edit;
 395
 396         /** @var bool|int */
 397         protected $contentLength = false;
 398
 399         /**
 400          * @var bool Set in ApiEditPage, based on ContentHandler::allowsDirectApiEditing
 401          */
 402         private $enableApiEditOverride = false;
 403
 404         /**
 405          * @var IContextSource
 406          */
 407         protected $context;
 408
 409         /**
 410          * @param Article $article
 411          */
 412         public function __construct( Article $article ) {
 413                 $this->mArticle = $article;
 414                 $this->page = $article->getPage(); // model object
 415                 $this->mTitle = $article->getTitle();
 416                 $this->context = $article->getContext();
 417
 418                 $this->contentModel = $this->mTitle->getContentModel();
 419
 420                 $handler = ContentHandler::getForModelID( $this->contentModel );
 421                 $this->contentFormat = $handler->getDefaultFormat();
 422         }
 423
 424         /**
 425          * @return Article
 426          */
 427         public function getArticle() {
 428                 return $this->mArticle;
 429         }
 430
 431         /**
 432          * @since 1.28
 433          * @return IContextSource
 434          */
 435         public function getContext() {
 436                 return $this->context;
 437         }
 438
 439         /**
 440          * @since 1.19
 441          * @return Title
 442          */
 443         public function getTitle() {
 444                 return $this->mTitle;
 445         }
 446
 447         /**
 448          * Set the context Title object
 449          *
 450          * @param Title|null $title Title object or null
 451          */
 452         public function setContextTitle( $title ) {
 453                 $this->mContextTitle = $title;
 454         }
 455
 456         /**
 457          * Get the context title object.
 458          * If not set, $wgTitle will be returned. This behavior might change in
 459          * the future to return $this->mTitle instead.
 460          *
 461          * @return Title
 462          */
 463         public function getContextTitle() {
 464                 if ( is_null( $this->mContextTitle ) ) {
 465                         global $wgTitle;
 466                         return $wgTitle;
 467                 } else {
 468                         return $this->mContextTitle;
 469                 }
 470         }
 471
 472         /**
 473          * Returns if the given content model is editable.
 474          *
 475          * @param string $modelId The ID of the content model to test. Use CONTENT_MODEL_XXX constants.
 476          * @return bool
 477          * @throws MWException If $modelId has no known handler
 478          */
 479         public function isSupportedContentModel( $modelId ) {
 480                 return $this->enableApiEditOverride === true ||
 481                         ContentHandler::getForModelID( $modelId )->supportsDirectEditing();
 482         }
 483
 484         /**
 485          * Allow editing of content that supports API direct editing, but not general
 486          * direct editing. Set to false by default.
 487          *
 488          * @param bool $enableOverride
 489          */
 490         public function setApiEditOverride( $enableOverride ) {
 491                 $this->enableApiEditOverride = $enableOverride;
 492         }
 493
 494         function submit() {
 495                 $this->edit();
 496         }
 497
 498         /**
 499          * This is the function that gets called for "action=edit". It
 500          * sets up various member variables, then passes execution to
 501          * another function, usually showEditForm()
 502          *
 503          * The edit form is self-submitting, so that when things like
 504          * preview and edit conflicts occur, we get the same form back
 505          * with the extra stuff added.  Only when the final submission
 506          * is made and all is well do we actually save and redirect to
 507          * the newly-edited page.
 508          */
 509         function edit() {
 510                 global $wgOut, $wgRequest, $wgUser;
 511                 // Allow extensions to modify/prevent this form or submission
 512                 if ( !Hooks::run( 'AlternateEdit', [ $this ] ) ) {
 513                         return;
 514                 }
 515
 516                 wfDebug( __METHOD__ . ": enter\n" );
 517
 518                 // If they used redlink=1 and the page exists, redirect to the main article
 519                 if ( $wgRequest->getBool( 'redlink' ) && $this->mTitle->exists() ) {
 520                         $wgOut->redirect( $this->mTitle->getFullURL() );
 521                         return;
 522                 }
 523
 524                 $this->importFormData( $wgRequest );
 525                 $this->firsttime = false;
 526
 527                 if ( wfReadOnly() && $this->save ) {
 528                         // Force preview
 529                         $this->save = false;
 530                         $this->preview = true;
 531                 }
 532
 533                 if ( $this->save ) {
 534                         $this->formtype = 'save';
 535                 } elseif ( $this->preview ) {
 536                         $this->formtype = 'preview';
 537                 } elseif ( $this->diff ) {
 538                         $this->formtype = 'diff';
 539                 } else { # First time through
 540                         $this->firsttime = true;
 541                         if ( $this->previewOnOpen() ) {
 542                                 $this->formtype = 'preview';
 543                         } else {
 544                                 $this->formtype = 'initial';
 545                         }
 546                 }
 547
 548                 $permErrors = $this->getEditPermissionErrors( $this->save ? 'secure' : 'full' );
 549                 if ( $permErrors ) {
 550                         wfDebug( __METHOD__ . ": User can't edit\n" );
 551                         // Auto-block user's IP if the account was "hard" blocked
 552                         if ( !wfReadOnly() ) {
 553                                 $user = $wgUser;
 554                                 DeferredUpdates::addCallableUpdate( function () use ( $user ) {
 555                                         $user->spreadAnyEditBlock();
 556                                 } );
 557                         }
 558                         $this->displayPermissionsError( $permErrors );
 559
 560                         return;
 561                 }
 562
 563                 $revision = $this->mArticle->getRevisionFetched();
 564                 // Disallow editing revisions with content models different from the current one
 565                 if ( $revision && $revision->getContentModel() !== $this->contentModel ) {
 566                         $this->displayViewSourcePage(
 567                                 $this->getContentObject(),
 568                                 wfMessage(
 569                                         'contentmodelediterror',
 570                                         $revision->getContentModel(),
 571                                         $this->contentModel
 572                                 )->plain()
 573                         );
 574                         return;
 575                 }
 576
 577                 $this->isConflict = false;
 578                 // css / js subpages of user pages get a special treatment
 579                 $this->isCssJsSubpage = $this->mTitle->isCssJsSubpage();
 580                 $this->isCssSubpage = $this->mTitle->isCssSubpage();
 581                 $this->isJsSubpage = $this->mTitle->isJsSubpage();
 582                 // @todo FIXME: Silly assignment.
 583                 $this->isWrongCaseCssJsPage = $this->isWrongCaseCssJsPage();
 584
 585                 # Show applicable editing introductions
 586                 if ( $this->formtype == 'initial' || $this->firsttime ) {
 587                         $this->showIntro();
 588                 }
 589
 590                 # Attempt submission here.  This will check for edit conflicts,
 591                 # and redundantly check for locked database, blocked IPs, etc.
 592                 # that edit() already checked just in case someone tries to sneak
 593                 # in the back door with a hand-edited submission URL.
 594
 595                 if ( 'save' == $this->formtype ) {
 596                         $resultDetails = null;
 597                         $status = $this->attemptSave( $resultDetails );
 598                         if ( !$this->handleStatus( $status, $resultDetails ) ) {
 599                                 return;
 600                         }
 601                 }
 602
 603                 # First time through: get contents, set time for conflict
 604                 # checking, etc.
 605                 if ( 'initial' == $this->formtype || $this->firsttime ) {
 606                         if ( $this->initialiseForm() === false ) {
 607                                 $this->noSuchSectionPage();
 608                                 return;
 609                         }
 610
 611                         if ( !$this->mTitle->getArticleID() ) {
 612                                 Hooks::run( 'EditFormPreloadText', [ &$this->textbox1, &$this->mTitle ] );
 613                         } else {
 614                                 Hooks::run( 'EditFormInitialText', [ $this ] );
 615                         }
 616
 617                 }
 618
 619                 $this->showEditForm();
 620         }
 621
 622         /**
 623          * @param string $rigor Same format as Title::getUserPermissionErrors()
 624          * @return array
 625          */
 626         protected function getEditPermissionErrors( $rigor = 'secure' ) {
 627                 global $wgUser;
 628
 629                 $permErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser, $rigor );
 630                 # Can this title be created?
 631                 if ( !$this->mTitle->exists() ) {
 632                         $permErrors = array_merge(
 633                                 $permErrors,
 634                                 wfArrayDiff2(
 635                                         $this->mTitle->getUserPermissionsErrors( 'create', $wgUser, $rigor ),
 636                                         $permErrors
 637                                 )
 638                         );
 639                 }
 640                 # Ignore some permissions errors when a user is just previewing/viewing diffs
 641                 $remove = [];
 642                 foreach ( $permErrors as $error ) {
 643                         if ( ( $this->preview || $this->diff )
 644                                 && ( $error[0] == 'blockedtext' || $error[0] == 'autoblockedtext' )
 645                         ) {
 646                                 $remove[] = $error;
 647                         }
 648                 }
 649                 $permErrors = wfArrayDiff2( $permErrors, $remove );
 650
 651                 return $permErrors;
 652         }
 653
 654         /**
 655          * Display a permissions error page, like OutputPage::showPermissionsErrorPage(),
 656          * but with the following differences:
 657          * - If redlink=1, the user will be redirected to the page
 658          * - If there is content to display or the error occurs while either saving,
 659          *   previewing or showing the difference, it will be a
 660          *   "View source for ..." page displaying the source code after the error message.
 661          *
 662          * @since 1.19
 663          * @param array $permErrors Array of permissions errors, as returned by
 664          *    Title::getUserPermissionsErrors().
 665          * @throws PermissionsError
 666          */
 667         protected function displayPermissionsError( array $permErrors ) {
 668                 global $wgRequest, $wgOut;
 669
 670                 if ( $wgRequest->getBool( 'redlink' ) ) {
 671                         // The edit page was reached via a red link.
 672                         // Redirect to the article page and let them click the edit tab if
 673                         // they really want a permission error.
 674                         $wgOut->redirect( $this->mTitle->getFullURL() );
 675                         return;
 676                 }
 677
 678                 $content = $this->getContentObject();
 679
 680                 # Use the normal message if there's nothing to display
 681                 if ( $this->firsttime && ( !$content || $content->isEmpty() ) ) {
 682                         $action = $this->mTitle->exists() ? 'edit' :
 683                                 ( $this->mTitle->isTalkPage() ? 'createtalk' : 'createpage' );
 684                         throw new PermissionsError( $action, $permErrors );
 685                 }
 686
 687                 $this->displayViewSourcePage(
 688                         $content,
 689                         $wgOut->formatPermissionsErrorMessage( $permErrors, 'edit' )
 690                 );
 691         }
 692
 693         /**
 694          * Display a read-only View Source page
 695          * @param Content $content content object
 696          * @param string $errorMessage additional wikitext error message to display
 697          */
 698         protected function displayViewSourcePage( Content $content, $errorMessage = '' ) {
 699                 global $wgOut;
 700
 701                 Hooks::run( 'EditPage::showReadOnlyForm:initial', [ $this, &$wgOut ] );
 702
 703                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
 704                 $wgOut->setPageTitle( wfMessage(
 705                         'viewsource-title',
 706                         $this->getContextTitle()->getPrefixedText()
 707                 ) );
 708                 $wgOut->addBacklinkSubtitle( $this->getContextTitle() );
 709                 $wgOut->addHTML( $this->editFormPageTop );
 710                 $wgOut->addHTML( $this->editFormTextTop );
 711
 712                 if ( $errorMessage !== '' ) {
 713                         $wgOut->addWikiText( $errorMessage );
 714                         $wgOut->addHTML( "<hr />\n" );
 715                 }
 716
 717                 # If the user made changes, preserve them when showing the markup
 718                 # (This happens when a user is blocked during edit, for instance)
 719                 if ( !$this->firsttime ) {
 720                         $text = $this->textbox1;
 721                         $wgOut->addWikiMsg( 'viewyourtext' );
 722                 } else {
 723                         try {
 724                                 $text = $this->toEditText( $content );
 725                         } catch ( MWException $e ) {
 726                                 # Serialize using the default format if the content model is not supported
 727                                 # (e.g. for an old revision with a different model)
 728                                 $text = $content->serialize();
 729                         }
 730                         $wgOut->addWikiMsg( 'viewsourcetext' );
 731                 }
 732
 733                 $wgOut->addHTML( $this->editFormTextBeforeContent );
 734                 $this->showTextbox( $text, 'wpTextbox1', [ 'readonly' ] );
 735                 $wgOut->addHTML( $this->editFormTextAfterContent );
 736
 737                 $wgOut->addHTML( Html::rawElement( 'div', [ 'class' => 'templatesUsed' ],
 738                         Linker::formatTemplates( $this->getTemplates() ) ) );
 739
 740                 $wgOut->addModules( 'mediawiki.action.edit.collapsibleFooter' );
 741
 742                 $wgOut->addHTML( $this->editFormTextBottom );
 743                 if ( $this->mTitle->exists() ) {
 744                         $wgOut->returnToMain( null, $this->mTitle );
 745                 }
 746         }
 747
 748         /**
 749          * Should we show a preview when the edit form is first shown?
 750          *
 751          * @return bool
 752          */
 753         protected function previewOnOpen() {
 754                 global $wgRequest, $wgUser, $wgPreviewOnOpenNamespaces;
 755                 if ( $wgRequest->getVal( 'preview' ) == 'yes' ) {
 756                         // Explicit override from request
 757                         return true;
 758                 } elseif ( $wgRequest->getVal( 'preview' ) == 'no' ) {
 759                         // Explicit override from request
 760                         return false;
 761                 } elseif ( $this->section == 'new' ) {
 762                         // Nothing *to* preview for new sections
 763                         return false;
 764                 } elseif ( ( $wgRequest->getVal( 'preload' ) !== null || $this->mTitle->exists() )
 765                         && $wgUser->getOption( 'previewonfirst' )
 766                 ) {
 767                         // Standard preference behavior
 768                         return true;
 769                 } elseif ( !$this->mTitle->exists()
 770                         && isset( $wgPreviewOnOpenNamespaces[$this->mTitle->getNamespace()] )
 771                         && $wgPreviewOnOpenNamespaces[$this->mTitle->getNamespace()]
 772                 ) {
 773                         // Categories are special
 774                         return true;
 775                 } else {
 776                         return false;
 777                 }
 778         }
 779
 780         /**
 781          * Checks whether the user entered a skin name in uppercase,
 782          * e.g. "User:Example/Monobook.css" instead of "monobook.css"
 783          *
 784          * @return bool
 785          */
 786         protected function isWrongCaseCssJsPage() {
 787                 if ( $this->mTitle->isCssJsSubpage() ) {
 788                         $name = $this->mTitle->getSkinFromCssJsSubpage();
 789                         $skins = array_merge(
 790                                 array_keys( Skin::getSkinNames() ),
 791                                 [ 'common' ]
 792                         );
 793                         return !in_array( $name, $skins )
 794                                 && in_array( strtolower( $name ), $skins );
 795                 } else {
 796                         return false;
 797                 }
 798         }
 799
 800         /**
 801          * Returns whether section editing is supported for the current page.
 802          * Subclasses may override this to replace the default behavior, which is
 803          * to check ContentHandler::supportsSections.
 804          *
 805          * @return bool True if this edit page supports sections, false otherwise.
 806          */
 807         protected function isSectionEditSupported() {
 808                 $contentHandler = ContentHandler::getForTitle( $this->mTitle );
 809                 return $contentHandler->supportsSections();
 810         }
 811
 812         /**
 813          * This function collects the form data and uses it to populate various member variables.
 814          * @param WebRequest $request
 815          * @throws ErrorPageError
 816          */
 817         function importFormData( &$request ) {
 818                 global $wgContLang, $wgUser;
 819
 820                 # Section edit can come from either the form or a link
 821                 $this->section = $request->getVal( 'wpSection', $request->getVal( 'section' ) );
 822
 823                 if ( $this->section !== null && $this->section !== '' && !$this->isSectionEditSupported() ) {
 824                         throw new ErrorPageError( 'sectioneditnotsupported-title', 'sectioneditnotsupported-text' );
 825                 }
 826
 827                 $this->isNew = !$this->mTitle->exists() || $this->section == 'new';
 828
 829                 if ( $request->wasPosted() ) {
 830                         # These fields need to be checked for encoding.
 831                         # Also remove trailing whitespace, but don't remove _initial_
 832                         # whitespace from the text boxes. This may be significant formatting.
 833                         $this->textbox1 = $this->safeUnicodeInput( $request, 'wpTextbox1' );
 834                         if ( !$request->getCheck( 'wpTextbox2' ) ) {
 835                                 // Skip this if wpTextbox2 has input, it indicates that we came
 836                                 // from a conflict page with raw page text, not a custom form
 837                                 // modified by subclasses
 838                                 $textbox1 = $this->importContentFormData( $request );
 839                                 if ( $textbox1 !== null ) {
 840                                         $this->textbox1 = $textbox1;
 841                                 }
 842                         }
 843
 844                         # Truncate for whole multibyte characters
 845                         $this->summary = $wgContLang->truncate( $request->getText( 'wpSummary' ), 255 );
 846
 847                         # If the summary consists of a heading, e.g. '==Foobar==', extract the title from the
 848                         # header syntax, e.g. 'Foobar'. This is mainly an issue when we are using wpSummary for
 849                         # section titles.
 850                         $this->summary = preg_replace( '/^\s*=+\s*(.*?)\s*=+\s*$/', '$1', $this->summary );
 851
 852                         # Treat sectiontitle the same way as summary.
 853                         # Note that wpSectionTitle is not yet a part of the actual edit form, as wpSummary is
 854                         # currently doing double duty as both edit summary and section title. Right now this
 855                         # is just to allow API edits to work around this limitation, but this should be
 856                         # incorporated into the actual edit form when EditPage is rewritten (Bugs 18654, 26312).
 857                         $this->sectiontitle = $wgContLang->truncate( $request->getText( 'wpSectionTitle' ), 255 );
 858                         $this->sectiontitle = preg_replace( '/^\s*=+\s*(.*?)\s*=+\s*$/', '$1', $this->sectiontitle );
 859
 860                         $this->edittime = $request->getVal( 'wpEdittime' );
 861                         $this->editRevId = $request->getIntOrNull( 'editRevId' );
 862                         $this->starttime = $request->getVal( 'wpStarttime' );
 863
 864                         $undidRev = $request->getInt( 'wpUndidRevision' );
 865                         if ( $undidRev ) {
 866                                 $this->undidRev = $undidRev;
 867                         }
 868
 869                         $this->scrolltop = $request->getIntOrNull( 'wpScrolltop' );
 870
 871                         if ( $this->textbox1 === '' && $request->getVal( 'wpTextbox1' ) === null ) {
 872                                 // wpTextbox1 field is missing, possibly due to being "too big"
 873                                 // according to some filter rules such as Suhosin's setting for
 874                                 // suhosin.request.max_value_length (d'oh)
 875                                 $this->incompleteForm = true;
 876                         } else {
 877                                 // If we receive the last parameter of the request, we can fairly
 878                                 // claim the POST request has not been truncated.
 879
 880                                 // TODO: softened the check for cutover.  Once we determine
 881                                 // that it is safe, we should complete the transition by
 882                                 // removing the "edittime" clause.
 883                                 $this->incompleteForm = ( !$request->getVal( 'wpUltimateParam' )
 884                                         && is_null( $this->edittime ) );
 885                         }
 886                         if ( $this->incompleteForm ) {
 887                                 # If the form is incomplete, force to preview.
 888                                 wfDebug( __METHOD__ . ": Form data appears to be incomplete\n" );
 889                                 wfDebug( "POST DATA: " . var_export( $_POST, true ) . "\n" );
 890                                 $this->preview = true;
 891                         } else {
 892                                 $this->preview = $request->getCheck( 'wpPreview' );
 893                                 $this->diff = $request->getCheck( 'wpDiff' );
 894
 895                                 // Remember whether a save was requested, so we can indicate
 896                                 // if we forced preview due to session failure.
 897                                 $this->mTriedSave = !$this->preview;
 898
 899                                 if ( $this->tokenOk( $request ) ) {
 900                                         # Some browsers will not report any submit button
 901                                         # if the user hits enter in the comment box.
 902                                         # The unmarked state will be assumed to be a save,
 903                                         # if the form seems otherwise complete.
 904                                         wfDebug( __METHOD__ . ": Passed token check.\n" );
 905                                 } elseif ( $this->diff ) {
 906                                         # Failed token check, but only requested "Show Changes".
 907                                         wfDebug( __METHOD__ . ": Failed token check; Show Changes requested.\n" );
 908                                 } else {
 909                                         # Page might be a hack attempt posted from
 910                                         # an external site. Preview instead of saving.
 911                                         wfDebug( __METHOD__ . ": Failed token check; forcing preview\n" );
 912                                         $this->preview = true;
 913                                 }
 914                         }
 915                         $this->save = !$this->preview && !$this->diff;
 916                         if ( !preg_match( '/^\d{14}$/', $this->edittime ) ) {
 917                                 $this->edittime = null;
 918                         }
 919
 920                         if ( !preg_match( '/^\d{14}$/', $this->starttime ) ) {
 921                                 $this->starttime = null;
 922                         }
 923
 924                         $this->recreate = $request->getCheck( 'wpRecreate' );
 925
 926                         $this->minoredit = $request->getCheck( 'wpMinoredit' );
 927                         $this->watchthis = $request->getCheck( 'wpWatchthis' );
 928
 929                         # Don't force edit summaries when a user is editing their own user or talk page
 930                         if ( ( $this->mTitle->mNamespace == NS_USER || $this->mTitle->mNamespace == NS_USER_TALK )
 931                                 && $this->mTitle->getText() == $wgUser->getName()
 932                         ) {
 933                                 $this->allowBlankSummary = true;
 934                         } else {
 935                                 $this->allowBlankSummary = $request->getBool( 'wpIgnoreBlankSummary' )
 936                                         || !$wgUser->getOption( 'forceeditsummary' );
 937                         }
 938
 939                         $this->autoSumm = $request->getText( 'wpAutoSummary' );
 940
 941                         $this->allowBlankArticle = $request->getBool( 'wpIgnoreBlankArticle' );
 942                         $this->allowSelfRedirect = $request->getBool( 'wpIgnoreSelfRedirect' );
 943
 944                         $changeTags = $request->getVal( 'wpChangeTags' );
 945                         if ( is_null( $changeTags ) || $changeTags === '' ) {
 946                                 $this->changeTags = [];
 947                         } else {
 948                                 $this->changeTags = array_filter( array_map( 'trim', explode( ',',
 949                                         $changeTags ) ) );
 950                         }
 951                 } else {
 952                         # Not a posted form? Start with nothing.
 953                         wfDebug( __METHOD__ . ": Not a posted form.\n" );
 954                         $this->textbox1 = '';
 955                         $this->summary = '';
 956                         $this->sectiontitle = '';
 957                         $this->edittime = '';
 958                         $this->editRevId = null;
 959                         $this->starttime = wfTimestampNow();
 960                         $this->edit = false;
 961                         $this->preview = false;
 962                         $this->save = false;
 963                         $this->diff = false;
 964                         $this->minoredit = false;
 965                         // Watch may be overridden by request parameters
 966                         $this->watchthis = $request->getBool( 'watchthis', false );
 967                         $this->recreate = false;
 968
 969                         // When creating a new section, we can preload a section title by passing it as the
 970                         // preloadtitle parameter in the URL (Bug 13100)
 971                         if ( $this->section == 'new' && $request->getVal( 'preloadtitle' ) ) {
 972                                 $this->sectiontitle = $request->getVal( 'preloadtitle' );
 973                                 // Once wpSummary isn't being use for setting section titles, we should delete this.
 974                                 $this->summary = $request->getVal( 'preloadtitle' );
 975                         } elseif ( $this->section != 'new' && $request->getVal( 'summary' ) ) {
 976                                 $this->summary = $request->getText( 'summary' );
 977                                 if ( $this->summary !== '' ) {
 978                                         $this->hasPresetSummary = true;
 979                                 }
 980                         }
 981
 982                         if ( $request->getVal( 'minor' ) ) {
 983                                 $this->minoredit = true;
 984                         }
 985                 }
 986
 987                 $this->oldid = $request->getInt( 'oldid' );
 988                 $this->parentRevId = $request->getInt( 'parentRevId' );
 989
 990                 $this->bot = $request->getBool( 'bot', true );
 991                 $this->nosummary = $request->getBool( 'nosummary' );
 992
 993                 // May be overridden by revision.
 994                 $this->contentModel = $request->getText( 'model', $this->contentModel );
 995                 // May be overridden by revision.
 996                 $this->contentFormat = $request->getText( 'format', $this->contentFormat );
 997
 998                 if ( !ContentHandler::getForModelID( $this->contentModel )
 999                         ->isSupportedFormat( $this->contentFormat )
1000                 ) {
1001                         throw new ErrorPageError(
1002                                 'editpage-notsupportedcontentformat-title',
1003                                 'editpage-notsupportedcontentformat-text',
1004                                 [ $this->contentFormat, ContentHandler::getLocalizedName( $this->contentModel ) ]
1005                         );
1006                 }
1007
1008                 /**
1009                  * @todo Check if the desired model is allowed in this namespace, and if
1010                  *   a transition from the page's current model to the new model is
1011                  *   allowed.
1012                  */
1013
1014                 $this->editintro = $request->getText( 'editintro',
1015                         // Custom edit intro for new sections
1016                         $this->section === 'new' ? 'MediaWiki:addsection-editintro' : '' );
1017
1018                 // Allow extensions to modify form data
1019                 Hooks::run( 'EditPage::importFormData', [ $this, $request ] );
1020
1021         }
1022
1023         /**
1024          * Subpage overridable method for extracting the page content data from the
1025          * posted form to be placed in $this->textbox1, if using customized input
1026          * this method should be overridden and return the page text that will be used
1027          * for saving, preview parsing and so on...
1028          *
1029          * @param WebRequest $request
1030          * @return string|null
1031          */
1032         protected function importContentFormData( &$request ) {
1033                 return; // Don't do anything, EditPage already extracted wpTextbox1
1034         }
1035
1036         /**
1037          * Initialise form fields in the object
1038          * Called on the first invocation, e.g. when a user clicks an edit link
1039          * @return bool If the requested section is valid
1040          */
1041         function initialiseForm() {
1042                 global $wgUser;
1043                 $this->edittime = $this->page->getTimestamp();
1044                 $this->editRevId = $this->page->getLatest();
1045
1046                 $content = $this->getContentObject( false ); # TODO: track content object?!
1047                 if ( $content === false ) {
1048                         return false;
1049                 }
1050                 $this->textbox1 = $this->toEditText( $content );
1051
1052                 // activate checkboxes if user wants them to be always active
1053                 # Sort out the "watch" checkbox
1054                 if ( $wgUser->getOption( 'watchdefault' ) ) {
1055                         # Watch all edits
1056                         $this->watchthis = true;
1057                 } elseif ( $wgUser->getOption( 'watchcreations' ) && !$this->mTitle->exists() ) {
1058                         # Watch creations
1059                         $this->watchthis = true;
1060                 } elseif ( $wgUser->isWatched( $this->mTitle ) ) {
1061                         # Already watched
1062                         $this->watchthis = true;
1063                 }
1064                 if ( $wgUser->getOption( 'minordefault' ) && !$this->isNew ) {
1065                         $this->minoredit = true;
1066                 }
1067                 if ( $this->textbox1 === false ) {
1068                         return false;
1069                 }
1070                 return true;
1071         }
1072
1073         /**
1074          * @param Content|null $def_content The default value to return
1075          *
1076          * @return Content|null Content on success, $def_content for invalid sections
1077          *
1078          * @since 1.21
1079          */
1080         protected function getContentObject( $def_content = null ) {
1081                 global $wgOut, $wgRequest, $wgUser, $wgContLang;
1082
1083                 $content = false;
1084
1085                 // For message page not locally set, use the i18n message.
1086                 // For other non-existent articles, use preload text if any.
1087                 if ( !$this->mTitle->exists() || $this->section == 'new' ) {
1088                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI && $this->section != 'new' ) {
1089                                 # If this is a system message, get the default text.
1090                                 $msg = $this->mTitle->getDefaultMessageText();
1091
1092                                 $content = $this->toEditContent( $msg );
1093                         }
1094                         if ( $content === false ) {
1095                                 # If requested, preload some text.
1096                                 $preload = $wgRequest->getVal( 'preload',
1097                                         // Custom preload text for new sections
1098                                         $this->section === 'new' ? 'MediaWiki:addsection-preload' : '' );
1099                                 $params = $wgRequest->getArray( 'preloadparams', [] );
1100
1101                                 $content = $this->getPreloadedContent( $preload, $params );
1102                         }
1103                 // For existing pages, get text based on "undo" or section parameters.
1104                 } else {
1105                         if ( $this->section != '' ) {
1106                                 // Get section edit text (returns $def_text for invalid sections)
1107                                 $orig = $this->getOriginalContent( $wgUser );
1108                                 $content = $orig ? $orig->getSection( $this->section ) : null;
1109
1110                                 if ( !$content ) {
1111                                         $content = $def_content;
1112                                 }
1113                         } else {
1114                                 $undoafter = $wgRequest->getInt( 'undoafter' );
1115                                 $undo = $wgRequest->getInt( 'undo' );
1116
1117                                 if ( $undo > 0 && $undoafter > 0 ) {
1118                                         $undorev = Revision::newFromId( $undo );
1119                                         $oldrev = Revision::newFromId( $undoafter );
1120
1121                                         # Sanity check, make sure it's the right page,
1122                                         # the revisions exist and they were not deleted.
1123                                         # Otherwise, $content will be left as-is.
1124                                         if ( !is_null( $undorev ) && !is_null( $oldrev ) &&
1125                                                 !$undorev->isDeleted( Revision::DELETED_TEXT ) &&
1126                                                 !$oldrev->isDeleted( Revision::DELETED_TEXT )
1127                                         ) {
1128                                                 $content = $this->page->getUndoContent( $undorev, $oldrev );
1129
1130                                                 if ( $content === false ) {
1131                                                         # Warn the user that something went wrong
1132                                                         $undoMsg = 'failure';
1133                                                 } else {
1134                                                         $oldContent = $this->page->getContent( Revision::RAW );
1135                                                         $popts = ParserOptions::newFromUserAndLang( $wgUser, $wgContLang );
1136                                                         $newContent = $content->preSaveTransform( $this->mTitle, $wgUser, $popts );
1137
1138                                                         if ( $newContent->equals( $oldContent ) ) {
1139                                                                 # Tell the user that the undo results in no change,
1140                                                                 # i.e. the revisions were already undone.
1141                                                                 $undoMsg = 'nochange';
1142                                                                 $content = false;
1143                                                         } else {
1144                                                                 # Inform the user of our success and set an automatic edit summary
1145                                                                 $undoMsg = 'success';
1146
1147                                                                 # If we just undid one rev, use an autosummary
1148                                                                 $firstrev = $oldrev->getNext();
1149                                                                 if ( $firstrev && $firstrev->getId() == $undo ) {
1150                                                                         $userText = $undorev->getUserText();
1151                                                                         if ( $userText === '' ) {
1152                                                                                 $undoSummary = wfMessage(
1153                                                                                         'undo-summary-username-hidden',
1154                                                                                         $undo
1155                                                                                 )->inContentLanguage()->text();
1156                                                                         } else {
1157                                                                                 $undoSummary = wfMessage(
1158                                                                                         'undo-summary',
1159                                                                                         $undo,
1160                                                                                         $userText
1161                                                                                 )->inContentLanguage()->text();
1162                                                                         }
1163                                                                         if ( $this->summary === '' ) {
1164                                                                                 $this->summary = $undoSummary;
1165                                                                         } else {
1166                                                                                 $this->summary = $undoSummary . wfMessage( 'colon-separator' )
1167                                                                                         ->inContentLanguage()->text() . $this->summary;
1168                                                                         }
1169                                                                         $this->undidRev = $undo;
1170                                                                 }
1171                                                                 $this->formtype = 'diff';
1172                                                         }
1173                                                 }
1174                                         } else {
1175                                                 // Failed basic sanity checks.
1176                                                 // Older revisions may have been removed since the link
1177                                                 // was created, or we may simply have got bogus input.
1178                                                 $undoMsg = 'norev';
1179                                         }
1180
1181                                         // Messages: undo-success, undo-failure, undo-norev, undo-nochange
1182                                         $class = ( $undoMsg == 'success' ? '' : 'error ' ) . "mw-undo-{$undoMsg}";
1183                                         $this->editFormPageTop .= $wgOut->parse( "<div class=\"{$class}\">" .
1184                                                 wfMessage( 'undo-' . $undoMsg )->plain() . '</div>', true, /* interface */true );
1185                                 }
1186
1187                                 if ( $content === false ) {
1188                                         $content = $this->getOriginalContent( $wgUser );
1189                                 }
1190                         }
1191                 }
1192
1193                 return $content;
1194         }
1195
1196         /**
1197          * Get the content of the wanted revision, without section extraction.
1198          *
1199          * The result of this function can be used to compare user's input with
1200          * section replaced in its context (using WikiPage::replaceSectionAtRev())
1201          * to the original text of the edit.
1202          *
1203          * This differs from Article::getContent() that when a missing revision is
1204          * encountered the result will be null and not the
1205          * 'missing-revision' message.
1206          *
1207          * @since 1.19
1208          * @param User $user The user to get the revision for
1209          * @return Content|null
1210          */
1211         private function getOriginalContent( User $user ) {
1212                 if ( $this->section == 'new' ) {
1213                         return $this->getCurrentContent();
1214                 }
1215                 $revision = $this->mArticle->getRevisionFetched();
1216                 if ( $revision === null ) {
1217                         if ( !$this->contentModel ) {
1218                                 $this->contentModel = $this->getTitle()->getContentModel();
1219                         }
1220                         $handler = ContentHandler::getForModelID( $this->contentModel );
1221
1222                         return $handler->makeEmptyContent();
1223                 }
1224                 $content = $revision->getContent( Revision::FOR_THIS_USER, $user );
1225                 return $content;
1226         }
1227
1228         /**
1229          * Get the edit's parent revision ID
1230          *
1231          * The "parent" revision is the ancestor that should be recorded in this
1232          * page's revision history.  It is either the revision ID of the in-memory
1233          * article content, or in the case of a 3-way merge in order to rebase
1234          * across a recoverable edit conflict, the ID of the newer revision to
1235          * which we have rebased this page.
1236          *
1237          * @since 1.27
1238          * @return int Revision ID
1239          */
1240         public function getParentRevId() {
1241                 if ( $this->parentRevId ) {
1242                         return $this->parentRevId;
1243                 } else {
1244                         return $this->mArticle->getRevIdFetched();
1245                 }
1246         }
1247
1248         /**
1249          * Get the current content of the page. This is basically similar to
1250          * WikiPage::getContent( Revision::RAW ) except that when the page doesn't exist an empty
1251          * content object is returned instead of null.
1252          *
1253          * @since 1.21
1254          * @return Content
1255          */
1256         protected function getCurrentContent() {
1257                 $rev = $this->page->getRevision();
1258                 $content = $rev ? $rev->getContent( Revision::RAW ) : null;
1259
1260                 if ( $content === false || $content === null ) {
1261                         if ( !$this->contentModel ) {
1262                                 $this->contentModel = $this->getTitle()->getContentModel();
1263                         }
1264                         $handler = ContentHandler::getForModelID( $this->contentModel );
1265
1266                         return $handler->makeEmptyContent();
1267                 } else {
1268                         // Content models should always be the same since we error
1269                         // out if they are different before this point.
1270                         $logger = LoggerFactory::getInstance( 'editpage' );
1271                         if ( $this->contentModel !== $rev->getContentModel() ) {
1272                                 $logger->warning( "Overriding content model from current edit {prev} to {new}", [
1273                                         'prev' => $this->contentModel,
1274                                         'new' => $rev->getContentModel(),
1275                                         'title' => $this->getTitle()->getPrefixedDBkey(),
1276                                         'method' => __METHOD__
1277                                 ] );
1278                                 $this->contentModel = $rev->getContentModel();
1279                         }
1280
1281                         // Given that the content models should match, the current selected
1282                         // format should be supported.
1283                         if ( !$content->isSupportedFormat( $this->contentFormat ) ) {
1284                                 $logger->warning( "Current revision content format unsupported. Overriding {prev} to {new}", [
1285
1286                                         'prev' => $this->contentFormat,
1287                                         'new' => $rev->getContentFormat(),
1288                                         'title' => $this->getTitle()->getPrefixedDBkey(),
1289                                         'method' => __METHOD__
1290                                 ] );
1291                                 $this->contentFormat = $rev->getContentFormat();
1292                         }
1293
1294                         return $content;
1295                 }
1296         }
1297
1298         /**
1299          * Use this method before edit() to preload some content into the edit box
1300          *
1301          * @param Content $content
1302          *
1303          * @since 1.21
1304          */
1305         public function setPreloadedContent( Content $content ) {
1306                 $this->mPreloadContent = $content;
1307         }
1308
1309         /**
1310          * Get the contents to be preloaded into the box, either set by
1311          * an earlier setPreloadText() or by loading the given page.
1312          *
1313          * @param string $preload Representing the title to preload from.
1314          * @param array $params Parameters to use (interface-message style) in the preloaded text
1315          *
1316          * @return Content
1317          *
1318          * @since 1.21
1319          */
1320         protected function getPreloadedContent( $preload, $params = [] ) {
1321                 global $wgUser;
1322
1323                 if ( !empty( $this->mPreloadContent ) ) {
1324                         return $this->mPreloadContent;
1325                 }
1326
1327                 $handler = ContentHandler::getForModelID( $this->contentModel );
1328
1329                 if ( $preload === '' ) {
1330                         return $handler->makeEmptyContent();
1331                 }
1332
1333                 $title = Title::newFromText( $preload );
1334                 # Check for existence to avoid getting MediaWiki:Noarticletext
1335                 if ( $title === null || !$title->exists() || !$title->userCan( 'read', $wgUser ) ) {
1336                         // TODO: somehow show a warning to the user!
1337                         return $handler->makeEmptyContent();
1338                 }
1339
1340                 $page = WikiPage::factory( $title );
1341                 if ( $page->isRedirect() ) {
1342                         $title = $page->getRedirectTarget();
1343                         # Same as before
1344                         if ( $title === null || !$title->exists() || !$title->userCan( 'read', $wgUser ) ) {
1345                                 // TODO: somehow show a warning to the user!
1346                                 return $handler->makeEmptyContent();
1347                         }
1348                         $page = WikiPage::factory( $title );
1349                 }
1350
1351                 $parserOptions = ParserOptions::newFromUser( $wgUser );
1352                 $content = $page->getContent( Revision::RAW );
1353
1354                 if ( !$content ) {
1355                         // TODO: somehow show a warning to the user!
1356                         return $handler->makeEmptyContent();
1357                 }
1358
1359                 if ( $content->getModel() !== $handler->getModelID() ) {
1360                         $converted = $content->convert( $handler->getModelID() );
1361
1362                         if ( !$converted ) {
1363                                 // TODO: somehow show a warning to the user!
1364                                 wfDebug( "Attempt to preload incompatible content: " .
1365                                         "can't convert " . $content->getModel() .
1366                                         " to " . $handler->getModelID() );
1367
1368                                 return $handler->makeEmptyContent();
1369                         }
1370
1371                         $content = $converted;
1372                 }
1373
1374                 return $content->preloadTransform( $title, $parserOptions, $params );
1375         }
1376
1377         /**
1378          * Make sure the form isn't faking a user's credentials.
1379          *
1380          * @param WebRequest $request
1381          * @return bool
1382          * @private
1383          */
1384         function tokenOk( &$request ) {
1385                 global $wgUser;
1386                 $token = $request->getVal( 'wpEditToken' );
1387                 $this->mTokenOk = $wgUser->matchEditToken( $token );
1388                 $this->mTokenOkExceptSuffix = $wgUser->matchEditTokenNoSuffix( $token );
1389                 return $this->mTokenOk;
1390         }
1391
1392         /**
1393          * Sets post-edit cookie indicating the user just saved a particular revision.
1394          *
1395          * This uses a temporary cookie for each revision ID so separate saves will never
1396          * interfere with each other.
1397          *
1398          * The cookie is deleted in the mediawiki.action.view.postEdit JS module after
1399          * the redirect.  It must be clearable by JavaScript code, so it must not be
1400          * marked HttpOnly. The JavaScript code converts the cookie to a wgPostEdit config
1401          * variable.
1402          *
1403          * If the variable were set on the server, it would be cached, which is unwanted
1404          * since the post-edit state should only apply to the load right after the save.
1405          *
1406          * @param int $statusValue The status value (to check for new article status)
1407          */
1408         protected function setPostEditCookie( $statusValue ) {
1409                 $revisionId = $this->page->getLatest();
1410                 $postEditKey = self::POST_EDIT_COOKIE_KEY_PREFIX . $revisionId;
1411
1412                 $val = 'saved';
1413                 if ( $statusValue == self::AS_SUCCESS_NEW_ARTICLE ) {
1414                         $val = 'created';
1415                 } elseif ( $this->oldid ) {
1416                         $val = 'restored';
1417                 }
1418
1419                 $response = RequestContext::getMain()->getRequest()->response();
1420                 $response->setCookie( $postEditKey, $val, time() + self::POST_EDIT_COOKIE_DURATION, [
1421                         'httpOnly' => false,
1422                 ] );
1423         }
1424
1425         /**
1426          * Attempt submission
1427          * @param array|bool $resultDetails See docs for $result in internalAttemptSave
1428          * @throws UserBlockedError|ReadOnlyError|ThrottledError|PermissionsError
1429          * @return Status The resulting status object.
1430          */
1431         public function attemptSave( &$resultDetails = false ) {
1432                 global $wgUser;
1433
1434                 # Allow bots to exempt some edits from bot flagging
1435                 $bot = $wgUser->isAllowed( 'bot' ) && $this->bot;
1436                 $status = $this->internalAttemptSave( $resultDetails, $bot );
1437
1438                 Hooks::run( 'EditPage::attemptSave:after', [ $this, $status, $resultDetails ] );
1439
1440                 return $status;
1441         }
1442
1443         /**
1444          * Handle status, such as after attempt save
1445          *
1446          * @param Status $status
1447          * @param array|bool $resultDetails
1448          *
1449          * @throws ErrorPageError
1450          * @return bool False, if output is done, true if rest of the form should be displayed
1451          */
1452         private function handleStatus( Status $status, $resultDetails ) {
1453                 global $wgUser, $wgOut;
1454
1455                 /**
1456                  * @todo FIXME: once the interface for internalAttemptSave() is made
1457                  *   nicer, this should use the message in $status
1458                  */
1459                 if ( $status->value == self::AS_SUCCESS_UPDATE
1460                         || $status->value == self::AS_SUCCESS_NEW_ARTICLE
1461                 ) {
1462                         $this->didSave = true;
1463                         if ( !$resultDetails['nullEdit'] ) {
1464                                 $this->setPostEditCookie( $status->value );
1465                         }
1466                 }
1467
1468                 // "wpExtraQueryRedirect" is a hidden input to modify
1469                 // after save URL and is not used by actual edit form
1470                 $request = RequestContext::getMain()->getRequest();
1471                 $extraQueryRedirect = $request->getVal( 'wpExtraQueryRedirect' );
1472
1473                 switch ( $status->value ) {
1474                         case self::AS_HOOK_ERROR_EXPECTED:
1475                         case self::AS_CONTENT_TOO_BIG:
1476                         case self::AS_ARTICLE_WAS_DELETED:
1477                         case self::AS_CONFLICT_DETECTED:
1478                         case self::AS_SUMMARY_NEEDED:
1479                         case self::AS_TEXTBOX_EMPTY:
1480                         case self::AS_MAX_ARTICLE_SIZE_EXCEEDED:
1481                         case self::AS_END:
1482                         case self::AS_BLANK_ARTICLE:
1483                         case self::AS_SELF_REDIRECT:
1484                                 return true;
1485
1486                         case self::AS_HOOK_ERROR:
1487                                 return false;
1488
1489                         case self::AS_CANNOT_USE_CUSTOM_MODEL:
1490                         case self::AS_PARSE_ERROR:
1491                                 $wgOut->addWikiText( '<div class="error">' . "\n" . $status->getWikiText() . '</div>' );
1492                                 return true;
1493
1494                         case self::AS_SUCCESS_NEW_ARTICLE:
1495                                 $query = $resultDetails['redirect'] ? 'redirect=no' : '';
1496                                 if ( $extraQueryRedirect ) {
1497                                         if ( $query === '' ) {
1498                                                 $query = $extraQueryRedirect;
1499                                         } else {
1500                                                 $query = $query . '&' . $extraQueryRedirect;
1501                                         }
1502                                 }
1503                                 $anchor = isset( $resultDetails['sectionanchor'] ) ? $resultDetails['sectionanchor'] : '';
1504                                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $anchor );
1505                                 return false;
1506
1507                         case self::AS_SUCCESS_UPDATE:
1508                                 $extraQuery = '';
1509                                 $sectionanchor = $resultDetails['sectionanchor'];
1510
1511                                 // Give extensions a chance to modify URL query on update
1512                                 Hooks::run(
1513                                         'ArticleUpdateBeforeRedirect',
1514                                         [ $this->mArticle, &$sectionanchor, &$extraQuery ]
1515                                 );
1516
1517                                 if ( $resultDetails['redirect'] ) {
1518                                         if ( $extraQuery == '' ) {
1519                                                 $extraQuery = 'redirect=no';
1520                                         } else {
1521                                                 $extraQuery = 'redirect=no&' . $extraQuery;
1522                                         }
1523                                 }
1524                                 if ( $extraQueryRedirect ) {
1525                                         if ( $extraQuery === '' ) {
1526                                                 $extraQuery = $extraQueryRedirect;
1527                                         } else {
1528                                                 $extraQuery = $extraQuery . '&' . $extraQueryRedirect;
1529                                         }
1530                                 }
1531
1532                                 $wgOut->redirect( $this->mTitle->getFullURL( $extraQuery ) . $sectionanchor );
1533                                 return false;
1534
1535                         case self::AS_SPAM_ERROR:
1536                                 $this->spamPageWithContent( $resultDetails['spam'] );
1537                                 return false;
1538
1539                         case self::AS_BLOCKED_PAGE_FOR_USER:
1540                                 throw new UserBlockedError( $wgUser->getBlock() );
1541
1542                         case self::AS_IMAGE_REDIRECT_ANON:
1543                         case self::AS_IMAGE_REDIRECT_LOGGED:
1544                                 throw new PermissionsError( 'upload' );
1545
1546                         case self::AS_READ_ONLY_PAGE_ANON:
1547                         case self::AS_READ_ONLY_PAGE_LOGGED:
1548                                 throw new PermissionsError( 'edit' );
1549
1550                         case self::AS_READ_ONLY_PAGE:
1551                                 throw new ReadOnlyError;
1552
1553                         case self::AS_RATE_LIMITED:
1554                                 throw new ThrottledError();
1555
1556                         case self::AS_NO_CREATE_PERMISSION:
1557                                 $permission = $this->mTitle->isTalkPage() ? 'createtalk' : 'createpage';
1558                                 throw new PermissionsError( $permission );
1559
1560                         case self::AS_NO_CHANGE_CONTENT_MODEL:
1561                                 throw new PermissionsError( 'editcontentmodel' );
1562
1563                         default:
1564                                 // We don't recognize $status->value. The only way that can happen
1565                                 // is if an extension hook aborted from inside ArticleSave.
1566                                 // Render the status object into $this->hookError
1567                                 // FIXME this sucks, we should just use the Status object throughout
1568                                 $this->hookError = '<div class="error">' ."\n" . $status->getWikiText() .
1569                                         '</div>';
1570                                 return true;
1571                 }
1572         }
1573
1574         /**
1575          * Run hooks that can filter edits just before they get saved.
1576          *
1577          * @param Content $content The Content to filter.
1578          * @param Status $status For reporting the outcome to the caller
1579          * @param User $user The user performing the edit
1580          *
1581          * @return bool
1582          */
1583         protected function runPostMergeFilters( Content $content, Status $status, User $user ) {
1584                 // Run old style post-section-merge edit filter
1585                 if ( !ContentHandler::runLegacyHooks( 'EditFilterMerged',
1586                         [ $this, $content, &$this->hookError, $this->summary ] )
1587                 ) {
1588                         # Error messages etc. could be handled within the hook...
1589                         $status->fatal( 'hookaborted' );
1590                         $status->value = self::AS_HOOK_ERROR;
1591                         return false;
1592                 } elseif ( $this->hookError != '' ) {
1593                         # ...or the hook could be expecting us to produce an error
1594                         $status->fatal( 'hookaborted' );
1595                         $status->value = self::AS_HOOK_ERROR_EXPECTED;
1596                         return false;
1597                 }
1598
1599                 // Run new style post-section-merge edit filter
1600                 if ( !Hooks::run( 'EditFilterMergedContent',
1601                                 [ $this->mArticle->getContext(), $content, $status, $this->summary,
1602                                 $user, $this->minoredit ] )
1603                 ) {
1604                         # Error messages etc. could be handled within the hook...
1605                         if ( $status->isGood() ) {
1606                                 $status->fatal( 'hookaborted' );
1607                                 // Not setting $this->hookError here is a hack to allow the hook
1608                                 // to cause a return to the edit page without $this->hookError
1609                                 // being set. This is used by ConfirmEdit to display a captcha
1610                                 // without any error message cruft.
1611                         } else {
1612                                 $this->hookError = $status->getWikiText();
1613                         }
1614                         // Use the existing $status->value if the hook set it
1615                         if ( !$status->value ) {
1616                                 $status->value = self::AS_HOOK_ERROR;
1617                         }
1618                         return false;
1619                 } elseif ( !$status->isOK() ) {
1620                         # ...or the hook could be expecting us to produce an error
1621                         // FIXME this sucks, we should just use the Status object throughout
1622                         $this->hookError = $status->getWikiText();
1623                         $status->fatal( 'hookaborted' );
1624                         $status->value = self::AS_HOOK_ERROR_EXPECTED;
1625                         return false;
1626                 }
1627
1628                 return true;
1629         }
1630
1631         /**
1632          * Return the summary to be used for a new section.
1633          *
1634          * @param string $sectionanchor Set to the section anchor text
1635          * @return string
1636          */
1637         private function newSectionSummary( &$sectionanchor = null ) {
1638                 global $wgParser;
1639
1640                 if ( $this->sectiontitle !== '' ) {
1641                         $sectionanchor = $wgParser->guessLegacySectionNameFromWikiText( $this->sectiontitle );
1642                         // If no edit summary was specified, create one automatically from the section
1643                         // title and have it link to the new section. Otherwise, respect the summary as
1644                         // passed.
1645                         if ( $this->summary === '' ) {
1646                                 $cleanSectionTitle = $wgParser->stripSectionName( $this->sectiontitle );
1647                                 return wfMessage( 'newsectionsummary' )
1648                                         ->rawParams( $cleanSectionTitle )->inContentLanguage()->text();
1649                         }
1650                 } elseif ( $this->summary !== '' ) {
1651                         $sectionanchor = $wgParser->guessLegacySectionNameFromWikiText( $this->summary );
1652                         # This is a new section, so create a link to the new section
1653                         # in the revision summary.
1654                         $cleanSummary = $wgParser->stripSectionName( $this->summary );
1655                         return wfMessage( 'newsectionsummary' )
1656                                 ->rawParams( $cleanSummary )->inContentLanguage()->text();
1657                 }
1658                 return $this->summary;
1659         }
1660
1661         /**
1662          * Attempt submission (no UI)
1663          *
1664          * @param array $result Array to add statuses to, currently with the
1665          *   possible keys:
1666          *   - spam (string): Spam string from content if any spam is detected by
1667          *     matchSpamRegex.
1668          *   - sectionanchor (string): Section anchor for a section save.
1669          *   - nullEdit (boolean): Set if doEditContent is OK.  True if null edit,
1670          *     false otherwise.
1671          *   - redirect (bool): Set if doEditContent is OK. True if resulting
1672          *     revision is a redirect.
1673          * @param bool $bot True if edit is being made under the bot right.
1674          *
1675          * @return Status Status object, possibly with a message, but always with
1676          *   one of the AS_* constants in $status->value,
1677          *
1678          * @todo FIXME: This interface is TERRIBLE, but hard to get rid of due to
1679          *   various error display idiosyncrasies. There are also lots of cases
1680          *   where error metadata is set in the object and retrieved later instead
1681          *   of being returned, e.g. AS_CONTENT_TOO_BIG and
1682          *   AS_BLOCKED_PAGE_FOR_USER. All that stuff needs to be cleaned up some
1683          * time.
1684          */
1685         function internalAttemptSave( &$result, $bot = false ) {
1686                 global $wgUser, $wgRequest, $wgParser, $wgMaxArticleSize;
1687                 global $wgContentHandlerUseDB;
1688
1689                 $status = Status::newGood();
1690
1691                 if ( !Hooks::run( 'EditPage::attemptSave', [ $this ] ) ) {
1692                         wfDebug( "Hook 'EditPage::attemptSave' aborted article saving\n" );
1693                         $status->fatal( 'hookaborted' );
1694                         $status->value = self::AS_HOOK_ERROR;
1695                         return $status;
1696                 }
1697
1698                 $spam = $wgRequest->getText( 'wpAntispam' );
1699                 if ( $spam !== '' ) {
1700                         wfDebugLog(
1701                                 'SimpleAntiSpam',
1702                                 $wgUser->getName() .
1703                                 ' editing "' .
1704                                 $this->mTitle->getPrefixedText() .
1705                                 '" submitted bogus field "' .
1706                                 $spam .
1707                                 '"'
1708                         );
1709                         $status->fatal( 'spamprotectionmatch', false );
1710                         $status->value = self::AS_SPAM_ERROR;
1711                         return $status;
1712                 }
1713
1714                 try {
1715                         # Construct Content object
1716                         $textbox_content = $this->toEditContent( $this->textbox1 );
1717                 } catch ( MWContentSerializationException $ex ) {
1718                         $status->fatal(
1719                                 'content-failed-to-parse',
1720                                 $this->contentModel,
1721                                 $this->contentFormat,
1722                                 $ex->getMessage()
1723                         );
1724                         $status->value = self::AS_PARSE_ERROR;
1725                         return $status;
1726                 }
1727
1728                 # Check image redirect
1729                 if ( $this->mTitle->getNamespace() == NS_FILE &&
1730                         $textbox_content->isRedirect() &&
1731                         !$wgUser->isAllowed( 'upload' )
1732                 ) {
1733                                 $code = $wgUser->isAnon() ? self::AS_IMAGE_REDIRECT_ANON : self::AS_IMAGE_REDIRECT_LOGGED;
1734                                 $status->setResult( false, $code );
1735
1736                                 return $status;
1737                 }
1738
1739                 # Check for spam
1740                 $match = self::matchSummarySpamRegex( $this->summary );
1741                 if ( $match === false && $this->section == 'new' ) {
1742                         # $wgSpamRegex is enforced on this new heading/summary because, unlike
1743                         # regular summaries, it is added to the actual wikitext.
1744                         if ( $this->sectiontitle !== '' ) {
1745                                 # This branch is taken when the API is used with the 'sectiontitle' parameter.
1746                                 $match = self::matchSpamRegex( $this->sectiontitle );
1747                         } else {
1748                                 # This branch is taken when the "Add Topic" user interface is used, or the API
1749                                 # is used with the 'summary' parameter.
1750                                 $match = self::matchSpamRegex( $this->summary );
1751                         }
1752                 }
1753                 if ( $match === false ) {
1754                         $match = self::matchSpamRegex( $this->textbox1 );
1755                 }
1756                 if ( $match !== false ) {
1757                         $result['spam'] = $match;
1758                         $ip = $wgRequest->getIP();
1759                         $pdbk = $this->mTitle->getPrefixedDBkey();
1760                         $match = str_replace( "\n", '', $match );
1761                         wfDebugLog( 'SpamRegex', "$ip spam regex hit [[$pdbk]]: \"$match\"" );
1762                         $status->fatal( 'spamprotectionmatch', $match );
1763                         $status->value = self::AS_SPAM_ERROR;
1764                         return $status;
1765                 }
1766                 if ( !Hooks::run(
1767                         'EditFilter',
1768                         [ $this, $this->textbox1, $this->section, &$this->hookError, $this->summary ] )
1769                 ) {
1770                         # Error messages etc. could be handled within the hook...
1771                         $status->fatal( 'hookaborted' );
1772                         $status->value = self::AS_HOOK_ERROR;
1773                         return $status;
1774                 } elseif ( $this->hookError != '' ) {
1775                         # ...or the hook could be expecting us to produce an error
1776                         $status->fatal( 'hookaborted' );
1777                         $status->value = self::AS_HOOK_ERROR_EXPECTED;
1778                         return $status;
1779                 }
1780
1781                 if ( $wgUser->isBlockedFrom( $this->mTitle, false ) ) {
1782                         // Auto-block user's IP if the account was "hard" blocked
1783                         if ( !wfReadOnly() ) {
1784                                 $wgUser->spreadAnyEditBlock();
1785                         }
1786                         # Check block state against master, thus 'false'.
1787                         $status->setResult( false, self::AS_BLOCKED_PAGE_FOR_USER );
1788                         return $status;
1789                 }
1790
1791                 $this->contentLength = strlen( $this->textbox1 );
1792                 if ( $this->contentLength > $wgMaxArticleSize * 1024 ) {
1793                         // Error will be displayed by showEditForm()
1794                         $this->tooBig = true;
1795                         $status->setResult( false, self::AS_CONTENT_TOO_BIG );
1796                         return $status;
1797                 }
1798
1799                 if ( !$wgUser->isAllowed( 'edit' ) ) {
1800                         if ( $wgUser->isAnon() ) {
1801                                 $status->setResult( false, self::AS_READ_ONLY_PAGE_ANON );
1802                                 return $status;
1803                         } else {
1804                                 $status->fatal( 'readonlytext' );
1805                                 $status->value = self::AS_READ_ONLY_PAGE_LOGGED;
1806                                 return $status;
1807                         }
1808                 }
1809
1810                 $changingContentModel = false;
1811                 if ( $this->contentModel !== $this->mTitle->getContentModel() ) {
1812                         if ( !$wgContentHandlerUseDB ) {
1813                                 $status->fatal( 'editpage-cannot-use-custom-model' );
1814                                 $status->value = self::AS_CANNOT_USE_CUSTOM_MODEL;
1815                                 return $status;
1816                         } elseif ( !$wgUser->isAllowed( 'editcontentmodel' ) ) {
1817                                 $status->setResult( false, self::AS_NO_CHANGE_CONTENT_MODEL );
1818                                 return $status;
1819
1820                         }
1821                         $changingContentModel = true;
1822                         $oldContentModel = $this->mTitle->getContentModel();
1823                 }
1824
1825                 if ( $this->changeTags ) {
1826                         $changeTagsStatus = ChangeTags::canAddTagsAccompanyingChange(
1827                                 $this->changeTags, $wgUser );
1828                         if ( !$changeTagsStatus->isOK() ) {
1829                                 $changeTagsStatus->value = self::AS_CHANGE_TAG_ERROR;
1830                                 return $changeTagsStatus;
1831                         }
1832                 }
1833
1834                 if ( wfReadOnly() ) {
1835                         $status->fatal( 'readonlytext' );
1836                         $status->value = self::AS_READ_ONLY_PAGE;
1837                         return $status;
1838                 }
1839                 if ( $wgUser->pingLimiter() || $wgUser->pingLimiter( 'linkpurge', 0 ) ) {
1840                         $status->fatal( 'actionthrottledtext' );
1841                         $status->value = self::AS_RATE_LIMITED;
1842                         return $status;
1843                 }
1844
1845                 # If the article has been deleted while editing, don't save it without
1846                 # confirmation
1847                 if ( $this->wasDeletedSinceLastEdit() && !$this->recreate ) {
1848                         $status->setResult( false, self::AS_ARTICLE_WAS_DELETED );
1849                         return $status;
1850                 }
1851
1852                 # Load the page data from the master. If anything changes in the meantime,
1853                 # we detect it by using page_latest like a token in a 1 try compare-and-swap.
1854                 $this->page->loadPageData( 'fromdbmaster' );
1855                 $new = !$this->page->exists();
1856
1857                 if ( $new ) {
1858                         // Late check for create permission, just in case *PARANOIA*
1859                         if ( !$this->mTitle->userCan( 'create', $wgUser ) ) {
1860                                 $status->fatal( 'nocreatetext' );
1861                                 $status->value = self::AS_NO_CREATE_PERMISSION;
1862                                 wfDebug( __METHOD__ . ": no create permission\n" );
1863                                 return $status;
1864                         }
1865
1866                         // Don't save a new page if it's blank or if it's a MediaWiki:
1867                         // message with content equivalent to default (allow empty pages
1868                         // in this case to disable messages, see bug 50124)
1869                         $defaultMessageText = $this->mTitle->getDefaultMessageText();
1870                         if ( $this->mTitle->getNamespace() === NS_MEDIAWIKI && $defaultMessageText !== false ) {
1871                                 $defaultText = $defaultMessageText;
1872                         } else {
1873                                 $defaultText = '';
1874                         }
1875
1876                         if ( !$this->allowBlankArticle && $this->textbox1 === $defaultText ) {
1877                                 $this->blankArticle = true;
1878                                 $status->fatal( 'blankarticle' );
1879                                 $status->setResult( false, self::AS_BLANK_ARTICLE );
1880                                 return $status;
1881                         }
1882
1883                         if ( !$this->runPostMergeFilters( $textbox_content, $status, $wgUser ) ) {
1884                                 return $status;
1885                         }
1886
1887                         $content = $textbox_content;
1888
1889                         $result['sectionanchor'] = '';
1890                         if ( $this->section == 'new' ) {
1891                                 if ( $this->sectiontitle !== '' ) {
1892                                         // Insert the section title above the content.
1893                                         $content = $content->addSectionHeader( $this->sectiontitle );
1894                                 } elseif ( $this->summary !== '' ) {
1895                                         // Insert the section title above the content.
1896                                         $content = $content->addSectionHeader( $this->summary );
1897                                 }
1898                                 $this->summary = $this->newSectionSummary( $result['sectionanchor'] );
1899                         }
1900
1901                         $status->value = self::AS_SUCCESS_NEW_ARTICLE;
1902
1903                 } else { # not $new
1904
1905                         # Article exists. Check for edit conflict.
1906
1907                         $this->page->clear(); # Force reload of dates, etc.
1908                         $timestamp = $this->page->getTimestamp();
1909                         $latest = $this->page->getLatest();
1910
1911                         wfDebug( "timestamp: {$timestamp}, edittime: {$this->edittime}\n" );
1912
1913                         // Check editRevId if set, which handles same-second timestamp collisions
1914                         if ( $timestamp != $this->edittime
1915                                 || ( $this->editRevId !== null && $this->editRevId != $latest )
1916                         ) {
1917                                 $this->isConflict = true;
1918                                 if ( $this->section == 'new' ) {
1919                                         if ( $this->page->getUserText() == $wgUser->getName() &&
1920                                                 $this->page->getComment() == $this->newSectionSummary()
1921                                         ) {
1922                                                 // Probably a duplicate submission of a new comment.
1923                                                 // This can happen when CDN resends a request after
1924                                                 // a timeout but the first one actually went through.
1925                                                 wfDebug( __METHOD__
1926                                                         . ": duplicate new section submission; trigger edit conflict!\n" );
1927                                         } else {
1928                                                 // New comment; suppress conflict.
1929                                                 $this->isConflict = false;
1930                                                 wfDebug( __METHOD__ . ": conflict suppressed; new section\n" );
1931                                         }
1932                                 } elseif ( $this->section == ''
1933                                         && Revision::userWasLastToEdit(
1934                                                 DB_MASTER, $this->mTitle->getArticleID(),
1935                                                 $wgUser->getId(), $this->edittime
1936                                         )
1937                                 ) {
1938                                         # Suppress edit conflict with self, except for section edits where merging is required.
1939                                         wfDebug( __METHOD__ . ": Suppressing edit conflict, same user.\n" );
1940                                         $this->isConflict = false;
1941                                 }
1942                         }
1943
1944                         // If sectiontitle is set, use it, otherwise use the summary as the section title.
1945                         if ( $this->sectiontitle !== '' ) {
1946                                 $sectionTitle = $this->sectiontitle;
1947                         } else {
1948                                 $sectionTitle = $this->summary;
1949                         }
1950
1951                         $content = null;
1952
1953                         if ( $this->isConflict ) {
1954                                 wfDebug( __METHOD__
1955                                         . ": conflict! getting section '{$this->section}' for time '{$this->edittime}'"
1956                                         . " (id '{$this->editRevId}') (article time '{$timestamp}')\n" );
1957                                 // @TODO: replaceSectionAtRev() with base ID (not prior current) for ?oldid=X case
1958                                 // ...or disable section editing for non-current revisions (not exposed anyway).
1959                                 if ( $this->editRevId !== null ) {
1960                                         $content = $this->page->replaceSectionAtRev(
1961                                                 $this->section,
1962                                                 $textbox_content,
1963                                                 $sectionTitle,
1964                                                 $this->editRevId
1965                                         );
1966                                 } else {
1967                                         $content = $this->page->replaceSectionContent(
1968                                                 $this->section,
1969                                                 $textbox_content,
1970                                                 $sectionTitle,
1971                                                 $this->edittime
1972                                         );
1973                                 }
1974                         } else {
1975                                 wfDebug( __METHOD__ . ": getting section '{$this->section}'\n" );
1976                                 $content = $this->page->replaceSectionContent(
1977                                         $this->section,
1978                                         $textbox_content,
1979                                         $sectionTitle
1980                                 );
1981                         }
1982
1983                         if ( is_null( $content ) ) {
1984                                 wfDebug( __METHOD__ . ": activating conflict; section replace failed.\n" );
1985                                 $this->isConflict = true;
1986                                 $content = $textbox_content; // do not try to merge here!
1987                         } elseif ( $this->isConflict ) {
1988                                 # Attempt merge
1989                                 if ( $this->mergeChangesIntoContent( $content ) ) {
1990                                         // Successful merge! Maybe we should tell the user the good news?
1991                                         $this->isConflict = false;
1992                                         wfDebug( __METHOD__ . ": Suppressing edit conflict, successful merge.\n" );
1993                                 } else {
1994                                         $this->section = '';
1995                                         $this->textbox1 = ContentHandler::getContentText( $content );
1996                                         wfDebug( __METHOD__ . ": Keeping edit conflict, failed merge.\n" );
1997                                 }
1998                         }
1999
2000                         if ( $this->isConflict ) {
2001                                 $status->setResult( false, self::AS_CONFLICT_DETECTED );
2002                                 return $status;
2003                         }
2004
2005                         if ( !$this->runPostMergeFilters( $content, $status, $wgUser ) ) {
2006                                 return $status;
2007                         }
2008
2009                         if ( $this->section == 'new' ) {
2010                                 // Handle the user preference to force summaries here
2011                                 if ( !$this->allowBlankSummary && trim( $this->summary ) == '' ) {
2012                                         $this->missingSummary = true;
2013                                         $status->fatal( 'missingsummary' ); // or 'missingcommentheader' if $section == 'new'. Blegh
2014                                         $status->value = self::AS_SUMMARY_NEEDED;
2015                                         return $status;
2016                                 }
2017
2018                                 // Do not allow the user to post an empty comment
2019                                 if ( $this->textbox1 == '' ) {
2020                                         $this->missingComment = true;
2021                                         $status->fatal( 'missingcommenttext' );
2022                                         $status->value = self::AS_TEXTBOX_EMPTY;
2023                                         return $status;
2024                                 }
2025                         } elseif ( !$this->allowBlankSummary
2026                                 && !$content->equals( $this->getOriginalContent( $wgUser ) )
2027                                 && !$content->isRedirect()
2028                                 && md5( $this->summary ) == $this->autoSumm
2029                         ) {
2030                                 $this->missingSummary = true;
2031                                 $status->fatal( 'missingsummary' );
2032                                 $status->value = self::AS_SUMMARY_NEEDED;
2033                                 return $status;
2034                         }
2035
2036                         # All's well
2037                         $sectionanchor = '';
2038                         if ( $this->section == 'new' ) {
2039                                 $this->summary = $this->newSectionSummary( $sectionanchor );
2040                         } elseif ( $this->section != '' ) {
2041                                 # Try to get a section anchor from the section source, redirect
2042                                 # to edited section if header found.
2043                                 # XXX: Might be better to integrate this into Article::replaceSectionAtRev
2044                                 # for duplicate heading checking and maybe parsing.
2045                                 $hasmatch = preg_match( "/^ *([=]{1,6})(.*?)(\\1) *\\n/i", $this->textbox1, $matches );
2046                                 # We can't deal with anchors, includes, html etc in the header for now,
2047                                 # headline would need to be parsed to improve this.
2048                                 if ( $hasmatch && strlen( $matches[2] ) > 0 ) {
2049                                         $sectionanchor = $wgParser->guessLegacySectionNameFromWikiText( $matches[2] );
2050                                 }
2051                         }
2052                         $result['sectionanchor'] = $sectionanchor;
2053
2054                         // Save errors may fall down to the edit form, but we've now
2055                         // merged the section into full text. Clear the section field
2056                         // so that later submission of conflict forms won't try to
2057                         // replace that into a duplicated mess.
2058                         $this->textbox1 = $this->toEditText( $content );
2059                         $this->section = '';
2060
2061                         $status->value = self::AS_SUCCESS_UPDATE;
2062                 }
2063
2064                 if ( !$this->allowSelfRedirect
2065                         && $content->isRedirect()
2066                         && $content->getRedirectTarget()->equals( $this->getTitle() )
2067                 ) {
2068                         // If the page already redirects to itself, don't warn.
2069                         $currentTarget = $this->getCurrentContent()->getRedirectTarget();
2070                         if ( !$currentTarget || !$currentTarget->equals( $this->getTitle() ) ) {
2071                                 $this->selfRedirect = true;
2072                                 $status->fatal( 'selfredirect' );
2073                                 $status->value = self::AS_SELF_REDIRECT;
2074                                 return $status;
2075                         }
2076                 }
2077
2078                 // Check for length errors again now that the section is merged in
2079                 $this->contentLength = strlen( $this->toEditText( $content ) );
2080                 if ( $this->contentLength > $wgMaxArticleSize * 1024 ) {
2081                         $this->tooBig = true;
2082                         $status->setResult( false, self::AS_MAX_ARTICLE_SIZE_EXCEEDED );
2083                         return $status;
2084                 }
2085
2086                 $flags = EDIT_AUTOSUMMARY |
2087                         ( $new ? EDIT_NEW : EDIT_UPDATE ) |
2088                         ( ( $this->minoredit && !$this->isNew ) ? EDIT_MINOR : 0 ) |
2089                         ( $bot ? EDIT_FORCE_BOT : 0 );
2090
2091                 $doEditStatus = $this->page->doEditContent(
2092                         $content,
2093                         $this->summary,
2094                         $flags,
2095                         false,
2096                         $wgUser,
2097                         $content->getDefaultFormat(),
2098                         $this->changeTags
2099                 );
2100
2101                 if ( !$doEditStatus->isOK() ) {
2102                         // Failure from doEdit()
2103                         // Show the edit conflict page for certain recognized errors from doEdit(),
2104                         // but don't show it for errors from extension hooks
2105                         $errors = $doEditStatus->getErrorsArray();
2106                         if ( in_array( $errors[0][0],
2107                                         [ 'edit-gone-missing', 'edit-conflict', 'edit-already-exists' ] )
2108                         ) {
2109                                 $this->isConflict = true;
2110                                 // Destroys data doEdit() put in $status->value but who cares
2111                                 $doEditStatus->value = self::AS_END;
2112                         }
2113                         return $doEditStatus;
2114                 }
2115
2116                 $result['nullEdit'] = $doEditStatus->hasMessage( 'edit-no-change' );
2117                 if ( $result['nullEdit'] ) {
2118                         // We don't know if it was a null edit until now, so increment here
2119                         $wgUser->pingLimiter( 'linkpurge' );
2120                 }
2121                 $result['redirect'] = $content->isRedirect();
2122
2123                 $this->updateWatchlist();
2124
2125                 // If the content model changed, add a log entry
2126                 if ( $changingContentModel ) {
2127                         $this->addContentModelChangeLogEntry(
2128                                 $wgUser,
2129                                 $new ? false : $oldContentModel,
2130                                 $this->contentModel,
2131                                 $this->summary
2132                         );
2133                 }
2134
2135                 return $status;
2136         }
2137
2138         /**
2139          * @param User $user
2140          * @param string|false $oldModel false if the page is being newly created
2141          * @param string $newModel
2142          * @param string $reason
2143          */
2144         protected function addContentModelChangeLogEntry( User $user, $oldModel, $newModel, $reason ) {
2145                 $new = $oldModel === false;
2146                 $log = new ManualLogEntry( 'contentmodel', $new ? 'new' : 'change' );
2147                 $log->setPerformer( $user );
2148                 $log->setTarget( $this->mTitle );
2149                 $log->setComment( $reason );
2150                 $log->setParameters( [
2151                         '4::oldmodel' => $oldModel,
2152                         '5::newmodel' => $newModel
2153                 ] );
2154                 $logid = $log->insert();
2155                 $log->publish( $logid );
2156         }
2157
2158         /**
2159          * Register the change of watch status
2160          */
2161         protected function updateWatchlist() {
2162                 global $wgUser;
2163
2164                 if ( !$wgUser->isLoggedIn() ) {
2165                         return;
2166                 }
2167
2168                 $user = $wgUser;
2169                 $title = $this->mTitle;
2170                 $watch = $this->watchthis;
2171                 // Do this in its own transaction to reduce contention...
2172                 DeferredUpdates::addCallableUpdate( function () use ( $user, $title, $watch ) {
2173                         if ( $watch == $user->isWatched( $title, User::IGNORE_USER_RIGHTS ) ) {
2174                                 return; // nothing to change
2175                         }
2176                         WatchAction::doWatchOrUnwatch( $watch, $title, $user );
2177                 } );
2178         }
2179
2180         /**
2181          * Attempts to do 3-way merge of edit content with a base revision
2182          * and current content, in case of edit conflict, in whichever way appropriate
2183          * for the content type.
2184          *
2185          * @since 1.21
2186          *
2187          * @param Content $editContent
2188          *
2189          * @return bool
2190          */
2191         private function mergeChangesIntoContent( &$editContent ) {
2192
2193                 $db = wfGetDB( DB_MASTER );
2194
2195                 // This is the revision the editor started from
2196                 $baseRevision = $this->getBaseRevision();
2197                 $baseContent = $baseRevision ? $baseRevision->getContent() : null;
2198
2199                 if ( is_null( $baseContent ) ) {
2200                         return false;
2201                 }
2202
2203                 // The current state, we want to merge updates into it
2204                 $currentRevision = Revision::loadFromTitle( $db, $this->mTitle );
2205                 $currentContent = $currentRevision ? $currentRevision->getContent() : null;
2206
2207                 if ( is_null( $currentContent ) ) {
2208                         return false;
2209                 }
2210
2211                 $handler = ContentHandler::getForModelID( $baseContent->getModel() );
2212
2213                 $result = $handler->merge3( $baseContent, $editContent, $currentContent );
2214
2215                 if ( $result ) {
2216                         $editContent = $result;
2217                         // Update parentRevId to what we just merged.
2218                         $this->parentRevId = $currentRevision->getId();
2219                         return true;
2220                 }
2221
2222                 return false;
2223         }
2224
2225         /**
2226          * @note: this method is very poorly named. If the user opened the form with ?oldid=X,
2227          *        one might think of X as the "base revision", which is NOT what this returns.
2228          * @return Revision Current version when the edit was started
2229          */
2230         function getBaseRevision() {
2231                 if ( !$this->mBaseRevision ) {
2232                         $db = wfGetDB( DB_MASTER );
2233                         $this->mBaseRevision = $this->editRevId
2234                                 ? Revision::newFromId( $this->editRevId, Revision::READ_LATEST )
2235                                 : Revision::loadFromTimestamp( $db, $this->mTitle, $this->edittime );
2236                 }
2237                 return $this->mBaseRevision;
2238         }
2239
2240         /**
2241          * Check given input text against $wgSpamRegex, and return the text of the first match.
2242          *
2243          * @param string $text
2244          *
2245          * @return string|bool Matching string or false
2246          */
2247         public static function matchSpamRegex( $text ) {
2248                 global $wgSpamRegex;
2249                 // For back compatibility, $wgSpamRegex may be a single string or an array of regexes.
2250                 $regexes = (array)$wgSpamRegex;
2251                 return self::matchSpamRegexInternal( $text, $regexes );
2252         }
2253
2254         /**
2255          * Check given input text against $wgSummarySpamRegex, and return the text of the first match.
2256          *
2257          * @param string $text
2258          *
2259          * @return string|bool Matching string or false
2260          */
2261         public static function matchSummarySpamRegex( $text ) {
2262                 global $wgSummarySpamRegex;
2263                 $regexes = (array)$wgSummarySpamRegex;
2264                 return self::matchSpamRegexInternal( $text, $regexes );
2265         }
2266
2267         /**
2268          * @param string $text
2269          * @param array $regexes
2270          * @return bool|string
2271          */
2272         protected static function matchSpamRegexInternal( $text, $regexes ) {
2273                 foreach ( $regexes as $regex ) {
2274                         $matches = [];
2275                         if ( preg_match( $regex, $text, $matches ) ) {
2276                                 return $matches[0];
2277                         }
2278                 }
2279                 return false;
2280         }
2281
2282         function setHeaders() {
2283                 global $wgOut, $wgUser, $wgAjaxEditStash;
2284
2285                 $wgOut->addModules( 'mediawiki.action.edit' );
2286                 $wgOut->addModuleStyles( 'mediawiki.action.edit.styles' );
2287
2288                 if ( $wgUser->getOption( 'showtoolbar' ) ) {
2289                         // The addition of default buttons is handled by getEditToolbar() which
2290                         // has its own dependency on this module. The call here ensures the module
2291                         // is loaded in time (it has position "top") for other modules to register
2292                         // buttons (e.g. extensions, gadgets, user scripts).
2293                         $wgOut->addModules( 'mediawiki.toolbar' );
2294                 }
2295
2296                 if ( $wgUser->getOption( 'uselivepreview' ) ) {
2297                         $wgOut->addModules( 'mediawiki.action.edit.preview' );
2298                 }
2299
2300                 if ( $wgUser->getOption( 'useeditwarning' ) ) {
2301                         $wgOut->addModules( 'mediawiki.action.edit.editWarning' );
2302                 }
2303
2304                 # Enabled article-related sidebar, toplinks, etc.
2305                 $wgOut->setArticleRelated( true );
2306
2307                 $contextTitle = $this->getContextTitle();
2308                 if ( $this->isConflict ) {
2309                         $msg = 'editconflict';
2310                 } elseif ( $contextTitle->exists() && $this->section != '' ) {
2311                         $msg = $this->section == 'new' ? 'editingcomment' : 'editingsection';
2312                 } else {
2313                         $msg = $contextTitle->exists()
2314                                 || ( $contextTitle->getNamespace() == NS_MEDIAWIKI
2315                                         && $contextTitle->getDefaultMessageText() !== false
2316                                 )
2317                                 ? 'editing'
2318                                 : 'creating';
2319                 }
2320
2321                 # Use the title defined by DISPLAYTITLE magic word when present
2322                 # NOTE: getDisplayTitle() returns HTML while getPrefixedText() returns plain text.
2323                 #       setPageTitle() treats the input as wikitext, which should be safe in either case.
2324                 $displayTitle = isset( $this->mParserOutput ) ? $this->mParserOutput->getDisplayTitle() : false;
2325                 if ( $displayTitle === false ) {
2326                         $displayTitle = $contextTitle->getPrefixedText();
2327                 }
2328                 $wgOut->setPageTitle( wfMessage( $msg, $displayTitle ) );
2329                 # Transmit the name of the message to JavaScript for live preview
2330                 # Keep Resources.php/mediawiki.action.edit.preview in sync with the possible keys
2331                 $wgOut->addJsConfigVars( [
2332                         'wgEditMessage' => $msg,
2333                         'wgAjaxEditStash' => $wgAjaxEditStash,
2334                 ] );
2335         }
2336
2337         /**
2338          * Show all applicable editing introductions
2339          */
2340         protected function showIntro() {
2341                 global $wgOut, $wgUser;
2342                 if ( $this->suppressIntro ) {
2343                         return;
2344                 }
2345
2346                 $namespace = $this->mTitle->getNamespace();
2347
2348                 if ( $namespace == NS_MEDIAWIKI ) {
2349                         # Show a warning if editing an interface message
2350                         $wgOut->wrapWikiMsg( "<div class='mw-editinginterface'>\n$1\n</div>", 'editinginterface' );
2351                         # If this is a default message (but not css or js),
2352                         # show a hint that it is translatable on translatewiki.net
2353                         if ( !$this->mTitle->hasContentModel( CONTENT_MODEL_CSS )
2354                                 && !$this->mTitle->hasContentModel( CONTENT_MODEL_JAVASCRIPT )
2355                         ) {
2356                                 $defaultMessageText = $this->mTitle->getDefaultMessageText();
2357                                 if ( $defaultMessageText !== false ) {
2358                                         $wgOut->wrapWikiMsg( "<div class='mw-translateinterface'>\n$1\n</div>",
2359                                                 'translateinterface' );
2360                                 }
2361                         }
2362                 } elseif ( $namespace == NS_FILE ) {
2363                         # Show a hint to shared repo
2364                         $file = wfFindFile( $this->mTitle );
2365                         if ( $file && !$file->isLocal() ) {
2366                                 $descUrl = $file->getDescriptionUrl();
2367                                 # there must be a description url to show a hint to shared repo
2368                                 if ( $descUrl ) {
2369                                         if ( !$this->mTitle->exists() ) {
2370                                                 $wgOut->wrapWikiMsg( "<div class=\"mw-sharedupload-desc-create\">\n$1\n</div>", [
2371                                                                         'sharedupload-desc-create', $file->getRepo()->getDisplayName(), $descUrl
2372                                                 ] );
2373                                         } else {
2374                                                 $wgOut->wrapWikiMsg( "<div class=\"mw-sharedupload-desc-edit\">\n$1\n</div>", [
2375                                                                         'sharedupload-desc-edit', $file->getRepo()->getDisplayName(), $descUrl
2376                                                 ] );
2377                                         }
2378                                 }
2379                         }
2380                 }
2381
2382                 # Show a warning message when someone creates/edits a user (talk) page but the user does not exist
2383                 # Show log extract when the user is currently blocked
2384                 if ( $namespace == NS_USER || $namespace == NS_USER_TALK ) {
2385                         $username = explode( '/', $this->mTitle->getText(), 2 )[0];
2386                         $user = User::newFromName( $username, false /* allow IP users*/ );
2387                         $ip = User::isIP( $username );
2388                         $block = Block::newFromTarget( $user, $user );
2389                         if ( !( $user && $user->isLoggedIn() ) && !$ip ) { # User does not exist
2390                                 $wgOut->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n$1\n</div>",
2391                                         [ 'userpage-userdoesnotexist', wfEscapeWikiText( $username ) ] );
2392                         } elseif ( !is_null( $block ) && $block->getType() != Block::TYPE_AUTO ) {
2393                                 # Show log extract if the user is currently blocked
2394                                 LogEventsList::showLogExtract(
2395                                         $wgOut,
2396                                         'block',
2397                                         MWNamespace::getCanonicalName( NS_USER ) . ':' . $block->getTarget(),
2398                                         '',
2399                                         [
2400                                                 'lim' => 1,
2401                                                 'showIfEmpty' => false,
2402                                                 'msgKey' => [
2403                                                         'blocked-notice-logextract',
2404                                                         $user->getName() # Support GENDER in notice
2405                                                 ]
2406                                         ]
2407                                 );
2408                         }
2409                 }
2410                 # Try to add a custom edit intro, or use the standard one if this is not possible.
2411                 if ( !$this->showCustomIntro() && !$this->mTitle->exists() ) {
2412                         $helpLink = wfExpandUrl( Skin::makeInternalOrExternalUrl(
2413                                 wfMessage( 'helppage' )->inContentLanguage()->text()
2414                         ) );
2415                         if ( $wgUser->isLoggedIn() ) {
2416                                 $wgOut->wrapWikiMsg(
2417                                         // Suppress the external link icon, consider the help url an internal one
2418                                         "<div class=\"mw-newarticletext plainlinks\">\n$1\n</div>",
2419                                         [
2420                                                 'newarticletext',
2421                                                 $helpLink
2422                                         ]
2423                                 );
2424                         } else {
2425                                 $wgOut->wrapWikiMsg(
2426                                         // Suppress the external link icon, consider the help url an internal one
2427                                         "<div class=\"mw-newarticletextanon plainlinks\">\n$1\n</div>",
2428                                         [
2429                                                 'newarticletextanon',
2430                                                 $helpLink
2431                                         ]
2432                                 );
2433                         }
2434                 }
2435                 # Give a notice if the user is editing a deleted/moved page...
2436                 if ( !$this->mTitle->exists() ) {
2437                         LogEventsList::showLogExtract( $wgOut, [ 'delete', 'move' ], $this->mTitle,
2438                                 '',
2439                                 [
2440                                         'lim' => 10,
2441                                         'conds' => [ "log_action != 'revision'" ],
2442                                         'showIfEmpty' => false,
2443                                         'msgKey' => [ 'recreate-moveddeleted-warn' ]
2444                                 ]
2445                         );
2446                 }
2447         }
2448
2449         /**
2450          * Attempt to show a custom editing introduction, if supplied
2451          *
2452          * @return bool
2453          */
2454         protected function showCustomIntro() {
2455                 if ( $this->editintro ) {
2456                         $title = Title::newFromText( $this->editintro );
2457                         if ( $title instanceof Title && $title->exists() && $title->userCan( 'read' ) ) {
2458                                 global $wgOut;
2459                                 // Added using template syntax, to take <noinclude>'s into account.
2460                                 $wgOut->addWikiTextTitleTidy(
2461                                         '<div class="mw-editintro">{{:' . $title->getFullText() . '}}</div>',
2462                                         $this->mTitle
2463                                 );
2464                                 return true;
2465                         }
2466                 }
2467                 return false;
2468         }
2469
2470         /**
2471          * Gets an editable textual representation of $content.
2472          * The textual representation can be turned by into a Content object by the
2473          * toEditContent() method.
2474          *
2475          * If $content is null or false or a string, $content is returned unchanged.
2476          *
2477          * If the given Content object is not of a type that can be edited using
2478          * the text base EditPage, an exception will be raised. Set
2479          * $this->allowNonTextContent to true to allow editing of non-textual
2480          * content.
2481          *
2482          * @param Content|null|bool|string $content
2483          * @return string The editable text form of the content.
2484          *
2485          * @throws MWException If $content is not an instance of TextContent and
2486          *   $this->allowNonTextContent is not true.
2487          */
2488         protected function toEditText( $content ) {
2489                 if ( $content === null || $content === false || is_string( $content ) ) {
2490                         return $content;
2491                 }
2492
2493                 if ( !$this->isSupportedContentModel( $content->getModel() ) ) {
2494                         throw new MWException( 'This content model is not supported: ' . $content->getModel() );
2495                 }
2496
2497                 return $content->serialize( $this->contentFormat );
2498         }
2499
2500         /**
2501          * Turns the given text into a Content object by unserializing it.
2502          *
2503          * If the resulting Content object is not of a type that can be edited using
2504          * the text base EditPage, an exception will be raised. Set
2505          * $this->allowNonTextContent to true to allow editing of non-textual
2506          * content.
2507          *
2508          * @param string|null|bool $text Text to unserialize
2509          * @return Content|bool|null The content object created from $text. If $text was false
2510          *   or null, false resp. null will be  returned instead.
2511          *
2512          * @throws MWException If unserializing the text results in a Content
2513          *   object that is not an instance of TextContent and
2514          *   $this->allowNonTextContent is not true.
2515          */
2516         protected function toEditContent( $text ) {
2517                 if ( $text === false || $text === null ) {
2518                         return $text;
2519                 }
2520
2521                 $content = ContentHandler::makeContent( $text, $this->getTitle(),
2522                         $this->contentModel, $this->contentFormat );
2523
2524                 if ( !$this->isSupportedContentModel( $content->getModel() ) ) {
2525                         throw new MWException( 'This content model is not supported: ' . $content->getModel() );
2526                 }
2527
2528                 return $content;
2529         }
2530
2531         /**
2532          * Send the edit form and related headers to $wgOut
2533          * @param callable|null $formCallback That takes an OutputPage parameter; will be called
2534          *     during form output near the top, for captchas and the like.
2535          *
2536          * The $formCallback parameter is deprecated since MediaWiki 1.25. Please
2537          * use the EditPage::showEditForm:fields hook instead.
2538          */
2539         function showEditForm( $formCallback = null ) {
2540                 global $wgOut, $wgUser;
2541
2542                 # need to parse the preview early so that we know which templates are used,
2543                 # otherwise users with "show preview after edit box" will get a blank list
2544                 # we parse this near the beginning so that setHeaders can do the title
2545                 # setting work instead of leaving it in getPreviewText
2546                 $previewOutput = '';
2547                 if ( $this->formtype == 'preview' ) {
2548                         $previewOutput = $this->getPreviewText();
2549                 }
2550
2551                 Hooks::run( 'EditPage::showEditForm:initial', [ &$this, &$wgOut ] );
2552
2553                 $this->setHeaders();
2554
2555                 if ( $this->showHeader() === false ) {
2556                         return;
2557                 }
2558
2559                 $wgOut->addHTML( $this->editFormPageTop );
2560
2561                 if ( $wgUser->getOption( 'previewontop' ) ) {
2562                         $this->displayPreviewArea( $previewOutput, true );
2563                 }
2564
2565                 $wgOut->addHTML( $this->editFormTextTop );
2566
2567                 $showToolbar = true;
2568                 if ( $this->wasDeletedSinceLastEdit() ) {
2569                         if ( $this->formtype == 'save' ) {
2570                                 // Hide the toolbar and edit area, user can click preview to get it back
2571                                 // Add an confirmation checkbox and explanation.
2572                                 $showToolbar = false;
2573                         } else {
2574                                 $wgOut->wrapWikiMsg( "<div class='error mw-deleted-while-editing'>\n$1\n</div>",
2575                                         'deletedwhileediting' );
2576                         }
2577                 }
2578
2579                 // @todo add EditForm plugin interface and use it here!
2580                 //       search for textarea1 and textares2, and allow EditForm to override all uses.
2581                 $wgOut->addHTML( Html::openElement(
2582                         'form',
2583                         [
2584                                 'id' => self::EDITFORM_ID,
2585                                 'name' => self::EDITFORM_ID,
2586                                 'method' => 'post',
2587                                 'action' => $this->getActionURL( $this->getContextTitle() ),
2588                                 'enctype' => 'multipart/form-data'
2589                         ]
2590                 ) );
2591
2592                 if ( is_callable( $formCallback ) ) {
2593                         wfWarn( 'The $formCallback parameter to ' . __METHOD__ . 'is deprecated' );
2594                         call_user_func_array( $formCallback, [ &$wgOut ] );
2595                 }
2596
2597                 // Add an empty field to trip up spambots
2598                 $wgOut->addHTML(
2599                         Xml::openElement( 'div', [ 'id' => 'antispam-container', 'style' => 'display: none;' ] )
2600                         . Html::rawElement(
2601                                 'label',
2602                                 [ 'for' => 'wpAntispam' ],
2603                                 wfMessage( 'simpleantispam-label' )->parse()
2604                         )
2605                         . Xml::element(
2606                                 'input',
2607                                 [
2608                                         'type' => 'text',
2609                                         'name' => 'wpAntispam',
2610                                         'id' => 'wpAntispam',
2611                                         'value' => ''
2612                                 ]
2613                         )
2614                         . Xml::closeElement( 'div' )
2615                 );
2616
2617                 Hooks::run( 'EditPage::showEditForm:fields', [ &$this, &$wgOut ] );
2618
2619                 // Put these up at the top to ensure they aren't lost on early form submission
2620                 $this->showFormBeforeText();
2621
2622                 if ( $this->wasDeletedSinceLastEdit() && 'save' == $this->formtype ) {
2623                         $username = $this->lastDelete->user_name;
2624                         $comment = $this->lastDelete->log_comment;
2625
2626                         // It is better to not parse the comment at all than to have templates expanded in the middle
2627                         // TODO: can the checkLabel be moved outside of the div so that wrapWikiMsg could be used?
2628                         $key = $comment === ''
2629                                 ? 'confirmrecreate-noreason'
2630                                 : 'confirmrecreate';
2631                         $wgOut->addHTML(
2632                                 '<div class="mw-confirm-recreate">' .
2633                                         wfMessage( $key, $username, "<nowiki>$comment</nowiki>" )->parse() .
2634                                 Xml::checkLabel( wfMessage( 'recreate' )->text(), 'wpRecreate', 'wpRecreate', false,
2635                                         [ 'title' => Linker::titleAttrib( 'recreate' ), 'tabindex' => 1, 'id' => 'wpRecreate' ]
2636                                 ) .
2637                                 '</div>'
2638                         );
2639                 }
2640
2641                 # When the summary is hidden, also hide them on preview/show changes
2642                 if ( $this->nosummary ) {
2643                         $wgOut->addHTML( Html::hidden( 'nosummary', true ) );
2644                 }
2645
2646                 # If a blank edit summary was previously provided, and the appropriate
2647                 # user preference is active, pass a hidden tag as wpIgnoreBlankSummary. This will stop the
2648                 # user being bounced back more than once in the event that a summary
2649                 # is not required.
2650                 # ####
2651                 # For a bit more sophisticated detection of blank summaries, hash the
2652                 # automatic one and pass that in the hidden field wpAutoSummary.
2653                 if ( $this->missingSummary || ( $this->section == 'new' && $this->nosummary ) ) {
2654                         $wgOut->addHTML( Html::hidden( 'wpIgnoreBlankSummary', true ) );
2655                 }
2656
2657                 if ( $this->undidRev ) {
2658                         $wgOut->addHTML( Html::hidden( 'wpUndidRevision', $this->undidRev ) );
2659                 }
2660
2661                 if ( $this->selfRedirect ) {
2662                         $wgOut->addHTML( Html::hidden( 'wpIgnoreSelfRedirect', true ) );
2663                 }
2664
2665                 if ( $this->hasPresetSummary ) {
2666                         // If a summary has been preset using &summary= we don't want to prompt for
2667                         // a different summary. Only prompt for a summary if the summary is blanked.
2668                         // (Bug 17416)
2669                         $this->autoSumm = md5( '' );
2670                 }
2671
2672                 $autosumm = $this->autoSumm ? $this->autoSumm : md5( $this->summary );
2673                 $wgOut->addHTML( Html::hidden( 'wpAutoSummary', $autosumm ) );
2674
2675                 $wgOut->addHTML( Html::hidden( 'oldid', $this->oldid ) );
2676                 $wgOut->addHTML( Html::hidden( 'parentRevId', $this->getParentRevId() ) );
2677
2678                 $wgOut->addHTML( Html::hidden( 'format', $this->contentFormat ) );
2679                 $wgOut->addHTML( Html::hidden( 'model', $this->contentModel ) );
2680
2681                 if ( $this->section == 'new' ) {
2682                         $this->showSummaryInput( true, $this->summary );
2683                         $wgOut->addHTML( $this->getSummaryPreview( true, $this->summary ) );
2684                 }
2685
2686                 $wgOut->addHTML( $this->editFormTextBeforeContent );
2687
2688                 if ( !$this->isCssJsSubpage && $showToolbar && $wgUser->getOption( 'showtoolbar' ) ) {
2689                         $wgOut->addHTML( EditPage::getEditToolbar( $this->mTitle ) );
2690                 }
2691
2692                 if ( $this->blankArticle ) {
2693                         $wgOut->addHTML( Html::hidden( 'wpIgnoreBlankArticle', true ) );
2694                 }
2695
2696                 if ( $this->isConflict ) {
2697                         // In an edit conflict bypass the overridable content form method
2698                         // and fallback to the raw wpTextbox1 since editconflicts can't be
2699                         // resolved between page source edits and custom ui edits using the
2700                         // custom edit ui.
2701                         $this->textbox2 = $this->textbox1;
2702
2703                         $content = $this->getCurrentContent();
2704                         $this->textbox1 = $this->toEditText( $content );
2705
2706                         $this->showTextbox1();
2707                 } else {
2708                         $this->showContentForm();
2709                 }
2710
2711                 $wgOut->addHTML( $this->editFormTextAfterContent );
2712
2713                 $this->showStandardInputs();
2714
2715                 $this->showFormAfterText();
2716
2717                 $this->showTosSummary();
2718
2719                 $this->showEditTools();
2720
2721                 $wgOut->addHTML( $this->editFormTextAfterTools . "\n" );
2722
2723                 $wgOut->addHTML( Html::rawElement( 'div', [ 'class' => 'templatesUsed' ],
2724                         Linker::formatTemplates( $this->getTemplates(), $this->preview, $this->section != '' ) ) );
2725
2726                 $wgOut->addHTML( Html::rawElement( 'div', [ 'class' => 'hiddencats' ],
2727                         Linker::formatHiddenCategories( $this->page->getHiddenCategories() ) ) );
2728
2729                 if ( $this->mParserOutput ) {
2730                         $wgOut->setLimitReportData( $this->mParserOutput->getLimitReportData() );
2731                 }
2732
2733                 $wgOut->addModules( 'mediawiki.action.edit.collapsibleFooter' );
2734
2735                 if ( $this->isConflict ) {
2736                         try {
2737                                 $this->showConflict();
2738                         } catch ( MWContentSerializationException $ex ) {
2739                                 // this can't really happen, but be nice if it does.
2740                                 $msg = wfMessage(
2741                                         'content-failed-to-parse',
2742                                         $this->contentModel,
2743                                         $this->contentFormat,
2744                                         $ex->getMessage()
2745                                 );
2746                                 $wgOut->addWikiText( '<div class="error">' . $msg->text() . '</div>' );
2747                         }
2748                 }
2749
2750                 // Set a hidden field so JS knows what edit form mode we are in
2751                 if ( $this->isConflict ) {
2752                         $mode = 'conflict';
2753                 } elseif ( $this->preview ) {
2754                         $mode = 'preview';
2755                 } elseif ( $this->diff ) {
2756                         $mode = 'diff';
2757                 } else {
2758                         $mode = 'text';
2759                 }
2760                 $wgOut->addHTML( Html::hidden( 'mode', $mode, [ 'id' => 'mw-edit-mode' ] ) );
2761
2762                 // Marker for detecting truncated form data.  This must be the last
2763                 // parameter sent in order to be of use, so do not move me.
2764                 $wgOut->addHTML( Html::hidden( 'wpUltimateParam', true ) );
2765                 $wgOut->addHTML( $this->editFormTextBottom . "\n</form>\n" );
2766
2767                 if ( !$wgUser->getOption( 'previewontop' ) ) {
2768                         $this->displayPreviewArea( $previewOutput, false );
2769                 }
2770
2771         }
2772
2773         /**
2774          * Extract the section title from current section text, if any.
2775          *
2776          * @param string $text
2777          * @return string|bool String or false
2778          */
2779         public static function extractSectionTitle( $text ) {
2780                 preg_match( "/^(=+)(.+)\\1\\s*(\n|$)/i", $text, $matches );
2781                 if ( !empty( $matches[2] ) ) {
2782                         global $wgParser;
2783                         return $wgParser->stripSectionName( trim( $matches[2] ) );
2784                 } else {
2785                         return false;
2786                 }
2787         }
2788
2789         /**
2790          * @return bool
2791          */
2792         protected function showHeader() {
2793                 global $wgOut, $wgUser, $wgMaxArticleSize, $wgLang;
2794                 global $wgAllowUserCss, $wgAllowUserJs;
2795
2796                 if ( $this->mTitle->isTalkPage() ) {
2797                         $wgOut->addWikiMsg( 'talkpagetext' );
2798                 }
2799
2800                 // Add edit notices
2801                 $editNotices = $this->mTitle->getEditNotices( $this->oldid );
2802                 if ( count( $editNotices ) ) {
2803                         $wgOut->addHTML( implode( "\n", $editNotices ) );
2804                 } else {
2805                         $msg = wfMessage( 'editnotice-notext' );
2806                         if ( !$msg->isDisabled() ) {
2807                                 $wgOut->addHTML(
2808                                         '<div class="mw-editnotice-notext">'
2809                                         . $msg->parseAsBlock()
2810                                         . '</div>'
2811                                 );
2812                         }
2813                 }
2814
2815                 if ( $this->isConflict ) {
2816                         $wgOut->wrapWikiMsg( "<div class='mw-explainconflict'>\n$1\n</div>", 'explainconflict' );
2817                         $this->editRevId = $this->page->getLatest();
2818                 } else {
2819                         if ( $this->section != '' && !$this->isSectionEditSupported() ) {
2820                                 // We use $this->section to much before this and getVal('wgSection') directly in other places
2821                                 // at this point we can't reset $this->section to '' to fallback to non-section editing.
2822                                 // Someone is welcome to try refactoring though
2823                                 $wgOut->showErrorPage( 'sectioneditnotsupported-title', 'sectioneditnotsupported-text' );
2824                                 return false;
2825                         }
2826
2827                         if ( $this->section != '' && $this->section != 'new' ) {
2828                                 if ( !$this->summary && !$this->preview && !$this->diff ) {
2829                                         $sectionTitle = self::extractSectionTitle( $this->textbox1 ); // FIXME: use Content object
2830                                         if ( $sectionTitle !== false ) {
2831                                                 $this->summary = "/* $sectionTitle */ ";
2832                                         }
2833                                 }
2834                         }
2835
2836                         if ( $this->missingComment ) {
2837                                 $wgOut->wrapWikiMsg( "<div id='mw-missingcommenttext'>\n$1\n</div>", 'missingcommenttext' );
2838                         }
2839
2840                         if ( $this->missingSummary && $this->section != 'new' ) {
2841                                 $wgOut->wrapWikiMsg( "<div id='mw-missingsummary'>\n$1\n</div>", 'missingsummary' );
2842                         }
2843
2844                         if ( $this->missingSummary && $this->section == 'new' ) {
2845                                 $wgOut->wrapWikiMsg( "<div id='mw-missingcommentheader'>\n$1\n</div>", 'missingcommentheader' );
2846                         }
2847
2848                         if ( $this->blankArticle ) {
2849                                 $wgOut->wrapWikiMsg( "<div id='mw-blankarticle'>\n$1\n</div>", 'blankarticle' );
2850                         }
2851
2852                         if ( $this->selfRedirect ) {
2853                                 $wgOut->wrapWikiMsg( "<div id='mw-selfredirect'>\n$1\n</div>", 'selfredirect' );
2854                         }
2855
2856                         if ( $this->hookError !== '' ) {
2857                                 $wgOut->addWikiText( $this->hookError );
2858                         }
2859
2860                         if ( !$this->checkUnicodeCompliantBrowser() ) {
2861                                 $wgOut->addWikiMsg( 'nonunicodebrowser' );
2862                         }
2863
2864                         if ( $this->section != 'new' ) {
2865                                 $revision = $this->mArticle->getRevisionFetched();
2866                                 if ( $revision ) {
2867                                         // Let sysop know that this will make private content public if saved
2868
2869                                         if ( !$revision->userCan( Revision::DELETED_TEXT, $wgUser ) ) {
2870                                                 $wgOut->wrapWikiMsg(
2871                                                         "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
2872                                                         'rev-deleted-text-permission'
2873                                                 );
2874                                         } elseif ( $revision->isDeleted( Revision::DELETED_TEXT ) ) {
2875                                                 $wgOut->wrapWikiMsg(
2876                                                         "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
2877                                                         'rev-deleted-text-view'
2878                                                 );
2879                                         }
2880
2881                                         if ( !$revision->isCurrent() ) {
2882                                                 $this->mArticle->setOldSubtitle( $revision->getId() );
2883                                                 $wgOut->addWikiMsg( 'editingold' );
2884                                         }
2885                                 } elseif ( $this->mTitle->exists() ) {
2886                                         // Something went wrong
2887
2888                                         $wgOut->wrapWikiMsg( "<div class='errorbox'>\n$1\n</div>\n",
2889                                                 [ 'missing-revision', $this->oldid ] );
2890                                 }
2891                         }
2892                 }
2893
2894                 if ( wfReadOnly() ) {
2895                         $wgOut->wrapWikiMsg(
2896                                 "<div id=\"mw-read-only-warning\">\n$1\n</div>",
2897                                 [ 'readonlywarning', wfReadOnlyReason() ]
2898                         );
2899                 } elseif ( $wgUser->isAnon() ) {
2900                         if ( $this->formtype != 'preview' ) {
2901                                 $wgOut->wrapWikiMsg(
2902                                         "<div id='mw-anon-edit-warning' class='warningbox'>\n$1\n</div>",
2903                                         [ 'anoneditwarning',
2904                                                 // Log-in link
2905                                                 SpecialPage::getTitleFor( 'Userlogin' )->getFullURL( [
2906                                                         'returnto' => $this->getTitle()->getPrefixedDBkey()
2907                                                 ] ),
2908                                                 // Sign-up link
2909                                                 SpecialPage::getTitleFor( 'CreateAccount' )->getFullURL( [
2910                                                         'returnto' => $this->getTitle()->getPrefixedDBkey()
2911                                                 ] )
2912                                         ]
2913                                 );
2914                         } else {
2915                                 $wgOut->wrapWikiMsg( "<div id=\"mw-anon-preview-warning\" class=\"warningbox\">\n$1</div>",
2916                                         'anonpreviewwarning'
2917                                 );
2918                         }
2919                 } else {
2920                         if ( $this->isCssJsSubpage ) {
2921                                 # Check the skin exists
2922                                 if ( $this->isWrongCaseCssJsPage ) {
2923                                         $wgOut->wrapWikiMsg(
2924                                                 "<div class='error' id='mw-userinvalidcssjstitle'>\n$1\n</div>",
2925                                                 [ 'userinvalidcssjstitle', $this->mTitle->getSkinFromCssJsSubpage() ]
2926                                         );
2927                                 }
2928                                 if ( $this->getTitle()->isSubpageOf( $wgUser->getUserPage() ) ) {
2929                                         $wgOut->wrapWikiMsg( '<div class="mw-usercssjspublic">$1</div>',
2930                                                 $this->isCssSubpage ? 'usercssispublic' : 'userjsispublic'
2931                                         );
2932                                         if ( $this->formtype !== 'preview' ) {
2933                                                 if ( $this->isCssSubpage && $wgAllowUserCss ) {
2934                                                         $wgOut->wrapWikiMsg(
2935                                                                 "<div id='mw-usercssyoucanpreview'>\n$1\n</div>",
2936                                                                 [ 'usercssyoucanpreview' ]
2937                                                         );
2938                                                 }
2939
2940                                                 if ( $this->isJsSubpage && $wgAllowUserJs ) {
2941                                                         $wgOut->wrapWikiMsg(
2942                                                                 "<div id='mw-userjsyoucanpreview'>\n$1\n</div>",
2943                                                                 [ 'userjsyoucanpreview' ]
2944                                                         );
2945                                                 }
2946                                         }
2947                                 }
2948                         }
2949                 }
2950
2951                 if ( $this->mTitle->isProtected( 'edit' ) &&
2952                         MWNamespace::getRestrictionLevels( $this->mTitle->getNamespace() ) !== [ '' ]
2953                 ) {
2954                         # Is the title semi-protected?
2955                         if ( $this->mTitle->isSemiProtected() ) {
2956                                 $noticeMsg = 'semiprotectedpagewarning';
2957                         } else {
2958                                 # Then it must be protected based on static groups (regular)
2959                                 $noticeMsg = 'protectedpagewarning';
2960                         }
2961                         LogEventsList::showLogExtract( $wgOut, 'protect', $this->mTitle, '',
2962                                 [ 'lim' => 1, 'msgKey' => [ $noticeMsg ] ] );
2963                 }
2964                 if ( $this->mTitle->isCascadeProtected() ) {
2965                         # Is this page under cascading protection from some source pages?
2966                         /** @var Title[] $cascadeSources */
2967                         list( $cascadeSources, /* $restrictions */ ) = $this->mTitle->getCascadeProtectionSources();
2968                         $notice = "<div class='mw-cascadeprotectedwarning'>\n$1\n";
2969                         $cascadeSourcesCount = count( $cascadeSources );
2970                         if ( $cascadeSourcesCount > 0 ) {
2971                                 # Explain, and list the titles responsible
2972                                 foreach ( $cascadeSources as $page ) {
2973                                         $notice .= '* [[:' . $page->getPrefixedText() . "]]\n";
2974                                 }
2975                         }
2976                         $notice .= '</div>';
2977                         $wgOut->wrapWikiMsg( $notice, [ 'cascadeprotectedwarning', $cascadeSourcesCount ] );
2978                 }
2979                 if ( !$this->mTitle->exists() && $this->mTitle->getRestrictions( 'create' ) ) {
2980                         LogEventsList::showLogExtract( $wgOut, 'protect', $this->mTitle, '',
2981                                 [ 'lim' => 1,
2982                                         'showIfEmpty' => false,
2983                                         'msgKey' => [ 'titleprotectedwarning' ],
2984                                         'wrap' => "<div class=\"mw-titleprotectedwarning\">\n$1</div>" ] );
2985                 }
2986
2987                 if ( $this->contentLength === false ) {
2988                         $this->contentLength = strlen( $this->textbox1 );
2989                 }
2990
2991                 if ( $this->tooBig || $this->contentLength > $wgMaxArticleSize * 1024 ) {
2992                         $wgOut->wrapWikiMsg( "<div class='error' id='mw-edit-longpageerror'>\n$1\n</div>",
2993                                 [
2994                                         'longpageerror',
2995                                         $wgLang->formatNum( round( $this->contentLength / 1024, 3 ) ),
2996                                         $wgLang->formatNum( $wgMaxArticleSize )
2997                                 ]
2998                         );
2999                 } else {
3000                         if ( !wfMessage( 'longpage-hint' )->isDisabled() ) {
3001                                 $wgOut->wrapWikiMsg( "<div id='mw-edit-longpage-hint'>\n$1\n</div>",
3002                                         [
3003                                                 'longpage-hint',
3004                                                 $wgLang->formatSize( strlen( $this->textbox1 ) ),
3005                                                 strlen( $this->textbox1 )
3006                                         ]
3007                                 );
3008                         }
3009                 }
3010                 # Add header copyright warning
3011                 $this->showHeaderCopyrightWarning();
3012
3013                 return true;
3014         }
3015
3016         /**
3017          * Standard summary input and label (wgSummary), abstracted so EditPage
3018          * subclasses may reorganize the form.
3019          * Note that you do not need to worry about the label's for=, it will be
3020          * inferred by the id given to the input. You can remove them both by
3021          * passing array( 'id' => false ) to $userInputAttrs.
3022          *
3023          * @param string $summary The value of the summary input
3024          * @param string $labelText The html to place inside the label
3025          * @param array $inputAttrs Array of attrs to use on the input
3026          * @param array $spanLabelAttrs Array of attrs to use on the span inside the label
3027          *
3028          * @return array An array in the format array( $label, $input )
3029          */
3030         function getSummaryInput( $summary = "", $labelText = null,
3031                 $inputAttrs = null, $spanLabelAttrs = null
3032         ) {
3033                 // Note: the maxlength is overridden in JS to 255 and to make it use UTF-8 bytes, not characters.
3034                 $inputAttrs = ( is_array( $inputAttrs ) ? $inputAttrs : [] ) + [
3035                         'id' => 'wpSummary',
3036                         'maxlength' => '200',
3037                         'tabindex' => '1',
3038                         'size' => 60,
3039                         'spellcheck' => 'true',
3040                 ] + Linker::tooltipAndAccesskeyAttribs( 'summary' );
3041
3042                 $spanLabelAttrs = ( is_array( $spanLabelAttrs ) ? $spanLabelAttrs : [] ) + [
3043                         'class' => $this->missingSummary ? 'mw-summarymissed' : 'mw-summary',
3044                         'id' => "wpSummaryLabel"
3045                 ];
3046
3047                 $label = null;
3048                 if ( $labelText ) {
3049                         $label = Xml::tags(
3050                                 'label',
3051                                 $inputAttrs['id'] ? [ 'for' => $inputAttrs['id'] ] : null,
3052                                 $labelText
3053                         );
3054                         $label = Xml::tags( 'span', $spanLabelAttrs, $label );
3055                 }
3056
3057                 $input = Html::input( 'wpSummary', $summary, 'text', $inputAttrs );
3058
3059                 return [ $label, $input ];
3060         }
3061
3062         /**
3063          * @param bool $isSubjectPreview True if this is the section subject/title
3064          *   up top, or false if this is the comment summary
3065          *   down below the textarea
3066          * @param string $summary The text of the summary to display
3067          */
3068         protected function showSummaryInput( $isSubjectPreview, $summary = "" ) {
3069                 global $wgOut;
3070                 # Add a class if 'missingsummary' is triggered to allow styling of the summary line
3071                 $summaryClass = $this->missingSummary ? 'mw-summarymissed' : 'mw-summary';
3072                 if ( $isSubjectPreview ) {
3073                         if ( $this->nosummary ) {
3074                                 return;
3075                         }
3076                 } else {
3077                         if ( !$this->mShowSummaryField ) {
3078                                 return;
3079                         }
3080                 }
3081                 $labelText = wfMessage( $isSubjectPreview ? 'subject' : 'summary' )->parse();
3082                 list( $label, $input ) = $this->getSummaryInput(
3083                         $summary,
3084                         $labelText,
3085                         [ 'class' => $summaryClass ],
3086                         []
3087                 );
3088                 $wgOut->addHTML( "{$label} {$input}" );
3089         }
3090
3091         /**
3092          * @param bool $isSubjectPreview True if this is the section subject/title
3093          *   up top, or false if this is the comment summary
3094          *   down below the textarea
3095          * @param string $summary The text of the summary to display
3096          * @return string
3097          */
3098         protected function getSummaryPreview( $isSubjectPreview, $summary = "" ) {
3099                 // avoid spaces in preview, gets always trimmed on save
3100                 $summary = trim( $summary );
3101                 if ( !$summary || ( !$this->preview && !$this->diff ) ) {
3102                         return "";
3103                 }
3104
3105                 global $wgParser;
3106
3107                 if ( $isSubjectPreview ) {
3108                         $summary = wfMessage( 'newsectionsummary' )->rawParams( $wgParser->stripSectionName( $summary ) )
3109                                 ->inContentLanguage()->text();
3110                 }
3111
3112                 $message = $isSubjectPreview ? 'subject-preview' : 'summary-preview';
3113
3114                 $summary = wfMessage( $message )->parse()
3115                         . Linker::commentBlock( $summary, $this->mTitle, $isSubjectPreview );
3116                 return Xml::tags( 'div', [ 'class' => 'mw-summary-preview' ], $summary );
3117         }
3118
3119         protected function showFormBeforeText() {
3120                 global $wgOut;
3121                 $section = htmlspecialchars( $this->section );
3122                 $wgOut->addHTML( <<<HTML
3123 <input type='hidden' value="{$section}" name="wpSection"/>
3124 <input type='hidden' value="{$this->starttime}" name="wpStarttime" />
3125 <input type='hidden' value="{$this->edittime}" name="wpEdittime" />
3126 <input type='hidden' value="{$this->editRevId}" name="editRevId" />
3127 <input type='hidden' value="{$this->scrolltop}" name="wpScrolltop" id="wpScrolltop" />
3128
3129 HTML
3130                 );
3131                 if ( !$this->checkUnicodeCompliantBrowser() ) {
3132                         $wgOut->addHTML( Html::hidden( 'safemode', '1' ) );
3133                 }
3134         }
3135
3136         protected function showFormAfterText() {
3137                 global $wgOut, $wgUser;
3138                 /**
3139                  * To make it harder for someone to slip a user a page
3140                  * which submits an edit form to the wiki without their
3141                  * knowledge, a random token is associated with the login
3142                  * session. If it's not passed back with the submission,
3143                  * we won't save the page, or render user JavaScript and
3144                  * CSS previews.
3145                  *
3146                  * For anon editors, who may not have a session, we just
3147                  * include the constant suffix to prevent editing from
3148                  * broken text-mangling proxies.
3149                  */
3150                 $wgOut->addHTML( "\n" . Html::hidden( "wpEditToken", $wgUser->getEditToken() ) . "\n" );
3151         }
3152
3153         /**
3154          * Subpage overridable method for printing the form for page content editing
3155          * By default this simply outputs wpTextbox1
3156          * Subclasses can override this to provide a custom UI for editing;
3157          * be it a form, or simply wpTextbox1 with a modified content that will be
3158          * reverse modified when extracted from the post data.
3159          * Note that this is basically the inverse for importContentFormData
3160          */
3161         protected function showContentForm() {
3162                 $this->showTextbox1();
3163         }
3164
3165         /**
3166          * Method to output wpTextbox1
3167          * The $textoverride method can be used by subclasses overriding showContentForm
3168          * to pass back to this method.
3169          *
3170          * @param array $customAttribs Array of html attributes to use in the textarea
3171          * @param string $textoverride Optional text to override $this->textarea1 with
3172          */
3173         protected function showTextbox1( $customAttribs = null, $textoverride = null ) {
3174                 if ( $this->wasDeletedSinceLastEdit() && $this->formtype == 'save' ) {
3175                         $attribs = [ 'style' => 'display:none;' ];
3176                 } else {
3177                         $classes = []; // Textarea CSS
3178                         if ( $this->mTitle->isProtected( 'edit' ) &&
3179                                 MWNamespace::getRestrictionLevels( $this->mTitle->getNamespace() ) !== [ '' ]
3180                         ) {
3181                                 # Is the title semi-protected?
3182                                 if ( $this->mTitle->isSemiProtected() ) {
3183                                         $classes[] = 'mw-textarea-sprotected';
3184                                 } else {
3185                                         # Then it must be protected based on static groups (regular)
3186                                         $classes[] = 'mw-textarea-protected';
3187                                 }
3188                                 # Is the title cascade-protected?
3189                                 if ( $this->mTitle->isCascadeProtected() ) {
3190                                         $classes[] = 'mw-textarea-cprotected';
3191                                 }
3192                         }
3193
3194                         $attribs = [ 'tabindex' => 1 ];
3195
3196                         if ( is_array( $customAttribs ) ) {
3197                                 $attribs += $customAttribs;
3198                         }
3199
3200                         if ( count( $classes ) ) {
3201                                 if ( isset( $attribs['class'] ) ) {
3202                                         $classes[] = $attribs['class'];
3203                                 }
3204                                 $attribs['class'] = implode( ' ', $classes );
3205                         }
3206                 }
3207
3208                 $this->showTextbox(
3209                         $textoverride !== null ? $textoverride : $this->textbox1,
3210                         'wpTextbox1',
3211                         $attribs
3212                 );
3213         }
3214
3215         protected function showTextbox2() {
3216                 $this->showTextbox( $this->textbox2, 'wpTextbox2', [ 'tabindex' => 6, 'readonly' ] );
3217         }
3218
3219         protected function showTextbox( $text, $name, $customAttribs = [] ) {
3220                 global $wgOut, $wgUser;
3221
3222                 $wikitext = $this->safeUnicodeOutput( $text );
3223                 if ( strval( $wikitext ) !== '' ) {
3224                         // Ensure there's a newline at the end, otherwise adding lines
3225                         // is awkward.
3226                         // But don't add a newline if the ext is empty, or Firefox in XHTML
3227                         // mode will show an extra newline. A bit annoying.
3228                         $wikitext .= "\n";
3229                 }
3230
3231                 $attribs = $customAttribs + [
3232                         'accesskey' => ',',
3233                         'id' => $name,
3234                         'cols' => $wgUser->getIntOption( 'cols' ),
3235                         'rows' => $wgUser->getIntOption( 'rows' ),
3236                         // Avoid PHP notices when appending preferences
3237                         // (appending allows customAttribs['style'] to still work).
3238                         'style' => ''
3239                 ];
3240
3241                 $pageLang = $this->mTitle->getPageLanguage();
3242                 $attribs['lang'] = $pageLang->getHtmlCode();
3243                 $attribs['dir'] = $pageLang->getDir();
3244
3245                 $wgOut->addHTML( Html::textarea( $name, $wikitext, $attribs ) );
3246         }
3247
3248         protected function displayPreviewArea( $previewOutput, $isOnTop = false ) {
3249                 global $wgOut;
3250                 $classes = [];
3251                 if ( $isOnTop ) {
3252                         $classes[] = 'ontop';
3253                 }
3254
3255                 $attribs = [ 'id' => 'wikiPreview', 'class' => implode( ' ', $classes ) ];
3256
3257                 if ( $this->formtype != 'preview' ) {
3258                         $attribs['style'] = 'display: none;';
3259                 }
3260
3261                 $wgOut->addHTML( Xml::openElement( 'div', $attribs ) );
3262
3263                 if ( $this->formtype == 'preview' ) {
3264                         $this->showPreview( $previewOutput );
3265                 } else {
3266                         // Empty content container for LivePreview
3267                         $pageViewLang = $this->mTitle->getPageViewLanguage();
3268                         $attribs = [ 'lang' => $pageViewLang->getHtmlCode(), 'dir' => $pageViewLang->getDir(),
3269                                 'class' => 'mw-content-' . $pageViewLang->getDir() ];
3270                         $wgOut->addHTML( Html::rawElement( 'div', $attribs ) );
3271                 }
3272
3273                 $wgOut->addHTML( '</div>' );
3274
3275                 if ( $this->formtype == 'diff' ) {
3276                         try {
3277                                 $this->showDiff();
3278                         } catch ( MWContentSerializationException $ex ) {
3279                                 $msg = wfMessage(
3280                                         'content-failed-to-parse',
3281                                         $this->contentModel,
3282                                         $this->contentFormat,
3283                                         $ex->getMessage()
3284                                 );
3285                                 $wgOut->addWikiText( '<div class="error">' . $msg->text() . '</div>' );
3286                         }
3287                 }
3288         }
3289
3290         /**
3291          * Append preview output to $wgOut.
3292          * Includes category rendering if this is a category page.
3293          *
3294          * @param string $text The HTML to be output for the preview.
3295          */
3296         protected function showPreview( $text ) {
3297                 global $wgOut;
3298                 if ( $this->mTitle->getNamespace() == NS_CATEGORY ) {
3299                         $this->mArticle->openShowCategory();
3300                 }
3301                 # This hook seems slightly odd here, but makes things more
3302                 # consistent for extensions.
3303                 Hooks::run( 'OutputPageBeforeHTML', [ &$wgOut, &$text ] );
3304                 $wgOut->addHTML( $text );
3305                 if ( $this->mTitle->getNamespace() == NS_CATEGORY ) {
3306                         $this->mArticle->closeShowCategory();
3307                 }
3308         }
3309
3310         /**
3311          * Get a diff between the current contents of the edit box and the
3312          * version of the page we're editing from.
3313          *
3314          * If this is a section edit, we'll replace the section as for final
3315          * save and then make a comparison.
3316          */
3317         function showDiff() {
3318                 global $wgUser, $wgContLang, $wgOut;
3319
3320                 $oldtitlemsg = 'currentrev';
3321                 # if message does not exist, show diff against the preloaded default
3322                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI && !$this->mTitle->exists() ) {
3323                         $oldtext = $this->mTitle->getDefaultMessageText();
3324                         if ( $oldtext !== false ) {
3325                                 $oldtitlemsg = 'defaultmessagetext';
3326                                 $oldContent = $this->toEditContent( $oldtext );
3327                         } else {
3328                                 $oldContent = null;
3329                         }
3330                 } else {
3331                         $oldContent = $this->getCurrentContent();
3332                 }
3333
3334                 $textboxContent = $this->toEditContent( $this->textbox1 );
3335                 if ( $this->editRevId !== null ) {
3336                         $newContent = $this->page->replaceSectionAtRev(
3337                                 $this->section, $textboxContent, $this->summary, $this->editRevId
3338                         );
3339                 } else {
3340                         $newContent = $this->page->replaceSectionContent(
3341                                 $this->section, $textboxContent, $this->summary, $this->edittime
3342                         );
3343                 }
3344
3345                 if ( $newContent ) {
3346                         ContentHandler::runLegacyHooks( 'EditPageGetDiffText', [ $this, &$newContent ] );
3347                         Hooks::run( 'EditPageGetDiffContent', [ $this, &$newContent ] );
3348
3349                         $popts = ParserOptions::newFromUserAndLang( $wgUser, $wgContLang );
3350                         $newContent = $newContent->preSaveTransform( $this->mTitle, $wgUser, $popts );
3351                 }
3352
3353                 if ( ( $oldContent && !$oldContent->isEmpty() ) || ( $newContent && !$newContent->isEmpty() ) ) {
3354                         $oldtitle = wfMessage( $oldtitlemsg )->parse();
3355                         $newtitle = wfMessage( 'yourtext' )->parse();
3356
3357                         if ( !$oldContent ) {
3358                                 $oldContent = $newContent->getContentHandler()->makeEmptyContent();
3359                         }
3360
3361                         if ( !$newContent ) {
3362                                 $newContent = $oldContent->getContentHandler()->makeEmptyContent();
3363                         }
3364
3365                         $de = $oldContent->getContentHandler()->createDifferenceEngine( $this->mArticle->getContext() );
3366                         $de->setContent( $oldContent, $newContent );
3367
3368                         $difftext = $de->getDiff( $oldtitle, $newtitle );
3369                         $de->showDiffStyle();
3370                 } else {
3371                         $difftext = '';
3372                 }
3373
3374                 $wgOut->addHTML( '<div id="wikiDiff">' . $difftext . '</div>' );
3375         }
3376
3377         /**
3378          * Show the header copyright warning.
3379          */
3380         protected function showHeaderCopyrightWarning() {
3381                 $msg = 'editpage-head-copy-warn';
3382                 if ( !wfMessage( $msg )->isDisabled() ) {
3383                         global $wgOut;
3384                         $wgOut->wrapWikiMsg( "<div class='editpage-head-copywarn'>\n$1\n</div>",
3385                                 'editpage-head-copy-warn' );
3386                 }
3387         }
3388
3389         /**
3390          * Give a chance for site and per-namespace customizations of
3391          * terms of service summary link that might exist separately
3392          * from the copyright notice.
3393          *
3394          * This will display between the save button and the edit tools,
3395          * so should remain short!
3396          */
3397         protected function showTosSummary() {
3398                 $msg = 'editpage-tos-summary';
3399                 Hooks::run( 'EditPageTosSummary', [ $this->mTitle, &$msg ] );
3400                 if ( !wfMessage( $msg )->isDisabled() ) {
3401                         global $wgOut;
3402                         $wgOut->addHTML( '<div class="mw-tos-summary">' );
3403                         $wgOut->addWikiMsg( $msg );
3404                         $wgOut->addHTML( '</div>' );
3405                 }
3406         }
3407
3408         protected function showEditTools() {
3409                 global $wgOut;
3410                 $wgOut->addHTML( '<div class="mw-editTools">' .
3411                         wfMessage( 'edittools' )->inContentLanguage()->parse() .
3412                         '</div>' );
3413         }
3414
3415         /**
3416          * Get the copyright warning
3417          *
3418          * Renamed to getCopyrightWarning(), old name kept around for backwards compatibility
3419          * @return string
3420          */
3421         protected function getCopywarn() {
3422                 return self::getCopyrightWarning( $this->mTitle );
3423         }
3424
3425         /**
3426          * Get the copyright warning, by default returns wikitext
3427          *
3428          * @param Title $title
3429          * @param string $format Output format, valid values are any function of a Message object
3430          * @return string
3431          */
3432         public static function getCopyrightWarning( $title, $format = 'plain' ) {
3433                 global $wgRightsText;
3434                 if ( $wgRightsText ) {
3435                         $copywarnMsg = [ 'copyrightwarning',
3436                                 '[[' . wfMessage( 'copyrightpage' )->inContentLanguage()->text() . ']]',
3437                                 $wgRightsText ];
3438                 } else {
3439                         $copywarnMsg = [ 'copyrightwarning2',
3440                                 '[[' . wfMessage( 'copyrightpage' )->inContentLanguage()->text() . ']]' ];
3441                 }
3442                 // Allow for site and per-namespace customization of contribution/copyright notice.
3443                 Hooks::run( 'EditPageCopyrightWarning', [ $title, &$copywarnMsg ] );
3444
3445                 return "<div id=\"editpage-copywarn\">\n" .
3446                         call_user_func_array( 'wfMessage', $copywarnMsg )->$format() . "\n</div>";
3447         }
3448
3449         /**
3450          * Get the Limit report for page previews
3451          *
3452          * @since 1.22
3453          * @param ParserOutput $output ParserOutput object from the parse
3454          * @return string HTML
3455          */
3456         public static function getPreviewLimitReport( $output ) {
3457                 if ( !$output || !$output->getLimitReportData() ) {
3458                         return '';
3459                 }
3460
3461                 return ResourceLoader::makeInlineScript(
3462                         ResourceLoader::makeConfigSetScript(
3463                                 [ 'wgPageParseReport' => $output->getLimitReportData() ],
3464                                 true
3465                         )
3466                 );
3467         }
3468
3469         protected function showStandardInputs( &$tabindex = 2 ) {
3470                 global $wgOut;
3471                 $wgOut->addHTML( "<div class='editOptions'>\n" );
3472
3473                 if ( $this->section != 'new' ) {
3474                         $this->showSummaryInput( false, $this->summary );
3475                         $wgOut->addHTML( $this->getSummaryPreview( false, $this->summary ) );
3476                 }
3477
3478                 $checkboxes = $this->getCheckboxes( $tabindex,
3479                         [ 'minor' => $this->minoredit, 'watch' => $this->watchthis ] );
3480                 $wgOut->addHTML( "<div class='editCheckboxes'>" . implode( $checkboxes, "\n" ) . "</div>\n" );
3481
3482                 // Show copyright warning.
3483                 $wgOut->addWikiText( $this->getCopywarn() );
3484                 $wgOut->addHTML( $this->editFormTextAfterWarn );
3485
3486                 $wgOut->addHTML( "<div class='editButtons'>\n" );
3487                 $wgOut->addHTML( implode( $this->getEditButtons( $tabindex ), "\n" ) . "\n" );
3488
3489                 $cancel = $this->getCancelLink();
3490                 if ( $cancel !== '' ) {
3491                         $cancel .= Html::element( 'span',
3492                                 [ 'class' => 'mw-editButtons-pipe-separator' ],
3493                                 wfMessage( 'pipe-separator' )->text() );
3494                 }
3495
3496                 $message = wfMessage( 'edithelppage' )->inContentLanguage()->text();
3497                 $edithelpurl = Skin::makeInternalOrExternalUrl( $message );
3498                 $attrs = [
3499                         'target' => 'helpwindow',
3500                         'href' => $edithelpurl,
3501                 ];
3502                 $edithelp = Html::linkButton( wfMessage( 'edithelp' )->text(),
3503                         $attrs, [ 'mw-ui-quiet' ] ) .
3504                         wfMessage( 'word-separator' )->escaped() .
3505                         wfMessage( 'newwindow' )->parse();
3506
3507                 $wgOut->addHTML( "      <span class='cancelLink'>{$cancel}</span>\n" );
3508                 $wgOut->addHTML( "      <span class='editHelp'>{$edithelp}</span>\n" );
3509                 $wgOut->addHTML( "</div><!-- editButtons -->\n" );
3510
3511                 Hooks::run( 'EditPage::showStandardInputs:options', [ $this, $wgOut, &$tabindex ] );
3512
3513                 $wgOut->addHTML( "</div><!-- editOptions -->\n" );
3514         }
3515
3516         /**
3517          * Show an edit conflict. textbox1 is already shown in showEditForm().
3518          * If you want to use another entry point to this function, be careful.
3519          */
3520         protected function showConflict() {
3521                 global $wgOut;
3522
3523                 if ( Hooks::run( 'EditPageBeforeConflictDiff', [ &$this, &$wgOut ] ) ) {
3524                         $stats = $wgOut->getContext()->getStats();
3525                         $stats->increment( 'edit.failures.conflict' );
3526                         // Only include 'standard' namespaces to avoid creating unknown numbers of statsd metrics
3527                         if (
3528                                 $this->mTitle->getNamespace() >= NS_MAIN &&
3529                                 $this->mTitle->getNamespace() <= NS_CATEGORY_TALK
3530                         ) {
3531                                 $stats->increment( 'edit.failures.conflict.byNamespaceId.' . $this->mTitle->getNamespace() );
3532                         }
3533
3534                         $wgOut->wrapWikiMsg( '<h2>$1</h2>', "yourdiff" );
3535
3536                         $content1 = $this->toEditContent( $this->textbox1 );
3537                         $content2 = $this->toEditContent( $this->textbox2 );
3538
3539                         $handler = ContentHandler::getForModelID( $this->contentModel );
3540                         $de = $handler->createDifferenceEngine( $this->mArticle->getContext() );
3541                         $de->setContent( $content2, $content1 );
3542                         $de->showDiff(
3543                                 wfMessage( 'yourtext' )->parse(),
3544                                 wfMessage( 'storedversion' )->text()
3545                         );
3546
3547                         $wgOut->wrapWikiMsg( '<h2>$1</h2>', "yourtext" );
3548                         $this->showTextbox2();
3549                 }
3550         }
3551
3552         /**
3553          * @return string
3554          */
3555         public function getCancelLink() {
3556                 $cancelParams = [];
3557                 if ( !$this->isConflict && $this->oldid > 0 ) {
3558                         $cancelParams['oldid'] = $this->oldid;
3559                 } elseif ( $this->getContextTitle()->isRedirect() ) {
3560                         $cancelParams['redirect'] = 'no';
3561                 }
3562                 $attrs = [ 'id' => 'mw-editform-cancel' ];
3563
3564                 return Linker::linkKnown(
3565                         $this->getContextTitle(),
3566                         wfMessage( 'cancel' )->parse(),
3567                         Html::buttonAttributes( $attrs, [ 'mw-ui-quiet' ] ),
3568                         $cancelParams
3569                 );
3570         }
3571
3572         /**
3573          * Returns the URL to use in the form's action attribute.
3574          * This is used by EditPage subclasses when simply customizing the action
3575          * variable in the constructor is not enough. This can be used when the
3576          * EditPage lives inside of a Special page rather than a custom page action.
3577          *
3578          * @param Title $title Title object for which is being edited (where we go to for &action= links)
3579          * @return string
3580          */
3581         protected function getActionURL( Title $title ) {
3582                 return $title->getLocalURL( [ 'action' => $this->action ] );
3583         }
3584
3585         /**
3586          * Check if a page was deleted while the user was editing it, before submit.
3587          * Note that we rely on the logging table, which hasn't been always there,
3588          * but that doesn't matter, because this only applies to brand new
3589          * deletes.
3590          * @return bool
3591          */
3592         protected function wasDeletedSinceLastEdit() {
3593                 if ( $this->deletedSinceEdit !== null ) {
3594                         return $this->deletedSinceEdit;
3595                 }
3596
3597                 $this->deletedSinceEdit = false;
3598
3599                 if ( !$this->mTitle->exists() && $this->mTitle->isDeletedQuick() ) {
3600                         $this->lastDelete = $this->getLastDelete();
3601                         if ( $this->lastDelete ) {
3602                                 $deleteTime = wfTimestamp( TS_MW, $this->lastDelete->log_timestamp );
3603                                 if ( $deleteTime > $this->starttime ) {
3604                                         $this->deletedSinceEdit = true;
3605                                 }
3606                         }
3607                 }
3608
3609                 return $this->deletedSinceEdit;
3610         }
3611
3612         /**
3613          * @return bool|stdClass
3614          */
3615         protected function getLastDelete() {
3616                 $dbr = wfGetDB( DB_REPLICA );
3617                 $data = $dbr->selectRow(
3618                         [ 'logging', 'user' ],
3619                         [
3620                                 'log_type',
3621                                 'log_action',
3622                                 'log_timestamp',
3623                                 'log_user',
3624                                 'log_namespace',
3625                                 'log_title',
3626                                 'log_comment',
3627                                 'log_params',
3628                                 'log_deleted',
3629                                 'user_name'
3630                         ], [
3631                                 'log_namespace' => $this->mTitle->getNamespace(),
3632                                 'log_title' => $this->mTitle->getDBkey(),
3633                                 'log_type' => 'delete',
3634                                 'log_action' => 'delete',
3635                                 'user_id=log_user'
3636                         ],
3637                         __METHOD__,
3638                         [ 'LIMIT' => 1, 'ORDER BY' => 'log_timestamp DESC' ]
3639                 );
3640                 // Quick paranoid permission checks...
3641                 if ( is_object( $data ) ) {
3642                         if ( $data->log_deleted & LogPage::DELETED_USER ) {
3643                                 $data->user_name = wfMessage( 'rev-deleted-user' )->escaped();
3644                         }
3645
3646                         if ( $data->log_deleted & LogPage::DELETED_COMMENT ) {
3647                                 $data->log_comment = wfMessage( 'rev-deleted-comment' )->escaped();
3648                         }
3649                 }
3650
3651                 return $data;
3652         }
3653
3654         /**
3655          * Get the rendered text for previewing.
3656          * @throws MWException
3657          * @return string
3658          */
3659         function getPreviewText() {
3660                 global $wgOut, $wgRawHtml, $wgLang;
3661                 global $wgAllowUserCss, $wgAllowUserJs;
3662
3663                 $stats = $wgOut->getContext()->getStats();
3664
3665                 if ( $wgRawHtml && !$this->mTokenOk ) {
3666                         // Could be an offsite preview attempt. This is very unsafe if
3667                         // HTML is enabled, as it could be an attack.
3668                         $parsedNote = '';
3669                         if ( $this->textbox1 !== '' ) {
3670                                 // Do not put big scary notice, if previewing the empty
3671                                 // string, which happens when you initially edit
3672                                 // a category page, due to automatic preview-on-open.
3673                                 $parsedNote = $wgOut->parse( "<div class='previewnote'>" .
3674                                         wfMessage( 'session_fail_preview_html' )->text() . "</div>", true, /* interface */true );
3675                         }
3676                         $stats->increment( 'edit.failures.session_loss' );
3677                         return $parsedNote;
3678                 }
3679
3680                 $note = '';
3681
3682                 try {
3683                         $content = $this->toEditContent( $this->textbox1 );
3684
3685                         $previewHTML = '';
3686                         if ( !Hooks::run(
3687                                 'AlternateEditPreview',
3688                                 [ $this, &$content, &$previewHTML, &$this->mParserOutput ] )
3689                         ) {
3690                                 return $previewHTML;
3691                         }
3692
3693                         # provide a anchor link to the editform
3694                         $continueEditing = '<span class="mw-continue-editing">' .
3695                                 '[[#' . self::EDITFORM_ID . '|' . $wgLang->getArrow() . ' ' .
3696                                 wfMessage( 'continue-editing' )->text() . ']]</span>';
3697                         if ( $this->mTriedSave && !$this->mTokenOk ) {
3698                                 if ( $this->mTokenOkExceptSuffix ) {
3699                                         $note = wfMessage( 'token_suffix_mismatch' )->plain();
3700                                         $stats->increment( 'edit.failures.bad_token' );
3701                                 } else {
3702                                         $note = wfMessage( 'session_fail_preview' )->plain();
3703                                         $stats->increment( 'edit.failures.session_loss' );
3704                                 }
3705                         } elseif ( $this->incompleteForm ) {
3706                                 $note = wfMessage( 'edit_form_incomplete' )->plain();
3707                                 if ( $this->mTriedSave ) {
3708                                         $stats->increment( 'edit.failures.incomplete_form' );
3709                                 }
3710                         } else {
3711                                 $note = wfMessage( 'previewnote' )->plain() . ' ' . $continueEditing;
3712                         }
3713
3714                         # don't parse non-wikitext pages, show message about preview
3715                         if ( $this->mTitle->isCssJsSubpage() || $this->mTitle->isCssOrJsPage() ) {
3716                                 if ( $this->mTitle->isCssJsSubpage() ) {
3717                                         $level = 'user';
3718                                 } elseif ( $this->mTitle->isCssOrJsPage() ) {
3719                                         $level = 'site';
3720                                 } else {
3721                                         $level = false;
3722                                 }
3723
3724                                 if ( $content->getModel() == CONTENT_MODEL_CSS ) {
3725                                         $format = 'css';
3726                                         if ( $level === 'user' && !$wgAllowUserCss ) {
3727                                                 $format = false;
3728                                         }
3729                                 } elseif ( $content->getModel() == CONTENT_MODEL_JAVASCRIPT ) {
3730                                         $format = 'js';
3731                                         if ( $level === 'user' && !$wgAllowUserJs ) {
3732                                                 $format = false;
3733                                         }
3734                                 } else {
3735                                         $format = false;
3736                                 }
3737
3738                                 # Used messages to make sure grep find them:
3739                                 # Messages: usercsspreview, userjspreview, sitecsspreview, sitejspreview
3740                                 if ( $level && $format ) {
3741                                         $note = "<div id='mw-{$level}{$format}preview'>" .
3742                                                 wfMessage( "{$level}{$format}preview" )->text() .
3743                                                 ' ' . $continueEditing . "</div>";
3744                                 }
3745                         }
3746
3747                         # If we're adding a comment, we need to show the
3748                         # summary as the headline
3749                         if ( $this->section === "new" && $this->summary !== "" ) {
3750                                 $content = $content->addSectionHeader( $this->summary );
3751                         }
3752
3753                         $hook_args = [ $this, &$content ];
3754                         ContentHandler::runLegacyHooks( 'EditPageGetPreviewText', $hook_args );
3755                         Hooks::run( 'EditPageGetPreviewContent', $hook_args );
3756
3757                         $parserResult = $this->doPreviewParse( $content );
3758                         $parserOutput = $parserResult['parserOutput'];
3759                         $previewHTML = $parserResult['html'];
3760                         $this->mParserOutput = $parserOutput;
3761                         $wgOut->addParserOutputMetadata( $parserOutput );
3762
3763                         if ( count( $parserOutput->getWarnings() ) ) {
3764                                 $note .= "\n\n" . implode( "\n\n", $parserOutput->getWarnings() );
3765                         }
3766
3767                 } catch ( MWContentSerializationException $ex ) {
3768                         $m = wfMessage(
3769                                 'content-failed-to-parse',
3770                                 $this->contentModel,
3771                                 $this->contentFormat,
3772                                 $ex->getMessage()
3773                         );
3774                         $note .= "\n\n" . $m->parse();
3775                         $previewHTML = '';
3776                 }
3777
3778                 if ( $this->isConflict ) {
3779                         $conflict = '<h2 id="mw-previewconflict">'
3780                                 . wfMessage( 'previewconflict' )->escaped() . "</h2>\n";
3781                 } else {
3782                         $conflict = '<hr />';
3783                 }
3784
3785                 $previewhead = "<div class='previewnote'>\n" .
3786                         '<h2 id="mw-previewheader">' . wfMessage( 'preview' )->escaped() . "</h2>" .
3787                         $wgOut->parse( $note, true, /* interface */true ) . $conflict . "</div>\n";
3788
3789                 $pageViewLang = $this->mTitle->getPageViewLanguage();
3790                 $attribs = [ 'lang' => $pageViewLang->getHtmlCode(), 'dir' => $pageViewLang->getDir(),
3791                         'class' => 'mw-content-' . $pageViewLang->getDir() ];
3792                 $previewHTML = Html::rawElement( 'div', $attribs, $previewHTML );
3793
3794                 return $previewhead . $previewHTML . $this->previewTextAfterContent;
3795         }
3796
3797         /**
3798          * Get parser options for a preview
3799          * @return ParserOptions
3800          */
3801         protected function getPreviewParserOptions() {
3802                 $parserOptions = $this->page->makeParserOptions( $this->mArticle->getContext() );
3803                 $parserOptions->setIsPreview( true );
3804                 $parserOptions->setIsSectionPreview( !is_null( $this->section ) && $this->section !== '' );
3805                 $parserOptions->enableLimitReport();
3806                 return $parserOptions;
3807         }
3808
3809         /**
3810          * Parse the page for a preview. Subclasses may override this class, in order
3811          * to parse with different options, or to otherwise modify the preview HTML.
3812          *
3813          * @param Content $content The page content
3814          * @return array with keys:
3815          *   - parserOutput: The ParserOutput object
3816          *   - html: The HTML to be displayed
3817          */
3818         protected function doPreviewParse( Content $content ) {
3819                 global $wgUser;
3820                 $parserOptions = $this->getPreviewParserOptions();
3821                 $pstContent = $content->preSaveTransform( $this->mTitle, $wgUser, $parserOptions );
3822                 $scopedCallback = $parserOptions->setupFakeRevision(
3823                         $this->mTitle, $pstContent, $wgUser );
3824                 $parserOutput = $pstContent->getParserOutput( $this->mTitle, null, $parserOptions );
3825                 ScopedCallback::consume( $scopedCallback );
3826                 $parserOutput->setEditSectionTokens( false ); // no section edit links
3827                 return [
3828                         'parserOutput' => $parserOutput,
3829                         'html' => $parserOutput->getText() ];
3830         }
3831
3832         /**
3833          * @return array
3834          */
3835         function getTemplates() {
3836                 if ( $this->preview || $this->section != '' ) {
3837                         $templates = [];
3838                         if ( !isset( $this->mParserOutput ) ) {
3839                                 return $templates;
3840                         }
3841                         foreach ( $this->mParserOutput->getTemplates() as $ns => $template ) {
3842                                 foreach ( array_keys( $template ) as $dbk ) {
3843                                         $templates[] = Title::makeTitle( $ns, $dbk );
3844                                 }
3845                         }
3846                         return $templates;
3847                 } else {
3848                         return $this->mTitle->getTemplateLinksFrom();
3849                 }
3850         }
3851
3852         /**
3853          * Shows a bulletin board style toolbar for common editing functions.
3854          * It can be disabled in the user preferences.
3855          *
3856          * @param Title $title Title object for the page being edited (optional)
3857          * @return string
3858          */
3859         static function getEditToolbar( $title = null ) {
3860                 global $wgContLang, $wgOut;
3861                 global $wgEnableUploads, $wgForeignFileRepos;
3862
3863                 $imagesAvailable = $wgEnableUploads || count( $wgForeignFileRepos );
3864                 $showSignature = true;
3865                 if ( $title ) {
3866                         $showSignature = MWNamespace::wantSignatures( $title->getNamespace() );
3867                 }
3868
3869                 /**
3870                  * $toolarray is an array of arrays each of which includes the
3871                  * opening tag, the closing tag, optionally a sample text that is
3872                  * inserted between the two when no selection is highlighted
3873                  * and.  The tip text is shown when the user moves the mouse
3874                  * over the button.
3875                  *
3876                  * Images are defined in ResourceLoaderEditToolbarModule.
3877                  */
3878                 $toolarray = [
3879                         [
3880                                 'id'     => 'mw-editbutton-bold',
3881                                 'open'   => '\'\'\'',
3882                                 'close'  => '\'\'\'',
3883                                 'sample' => wfMessage( 'bold_sample' )->text(),
3884                                 'tip'    => wfMessage( 'bold_tip' )->text(),
3885                         ],
3886                         [
3887                                 'id'     => 'mw-editbutton-italic',
3888                                 'open'   => '\'\'',
3889                                 'close'  => '\'\'',
3890                                 'sample' => wfMessage( 'italic_sample' )->text(),
3891                                 'tip'    => wfMessage( 'italic_tip' )->text(),
3892                         ],
3893                         [
3894                                 'id'     => 'mw-editbutton-link',
3895                                 'open'   => '[[',
3896                                 'close'  => ']]',
3897                                 'sample' => wfMessage( 'link_sample' )->text(),
3898                                 'tip'    => wfMessage( 'link_tip' )->text(),
3899                         ],
3900                         [
3901                                 'id'     => 'mw-editbutton-extlink',
3902                                 'open'   => '[',
3903                                 'close'  => ']',
3904                                 'sample' => wfMessage( 'extlink_sample' )->text(),
3905                                 'tip'    => wfMessage( 'extlink_tip' )->text(),
3906                         ],
3907                         [
3908                                 'id'     => 'mw-editbutton-headline',
3909                                 'open'   => "\n== ",
3910                                 'close'  => " ==\n",
3911                                 'sample' => wfMessage( 'headline_sample' )->text(),
3912                                 'tip'    => wfMessage( 'headline_tip' )->text(),
3913                         ],
3914                         $imagesAvailable ? [
3915                                 'id'     => 'mw-editbutton-image',
3916                                 'open'   => '[[' . $wgContLang->getNsText( NS_FILE ) . ':',
3917                                 'close'  => ']]',
3918                                 'sample' => wfMessage( 'image_sample' )->text(),
3919                                 'tip'    => wfMessage( 'image_tip' )->text(),
3920                         ] : false,
3921                         $imagesAvailable ? [
3922                                 'id'     => 'mw-editbutton-media',
3923                                 'open'   => '[[' . $wgContLang->getNsText( NS_MEDIA ) . ':',
3924                                 'close'  => ']]',
3925                                 'sample' => wfMessage( 'media_sample' )->text(),
3926                                 'tip'    => wfMessage( 'media_tip' )->text(),
3927                         ] : false,
3928                         [
3929                                 'id'     => 'mw-editbutton-nowiki',
3930                                 'open'   => "<nowiki>",
3931                                 'close'  => "</nowiki>",
3932                                 'sample' => wfMessage( 'nowiki_sample' )->text(),
3933                                 'tip'    => wfMessage( 'nowiki_tip' )->text(),
3934                         ],
3935                         $showSignature ? [
3936                                 'id'     => 'mw-editbutton-signature',
3937                                 'open'   => wfMessage( 'sig-text', '~~~~' )->inContentLanguage()->text(),
3938                                 'close'  => '',
3939                                 'sample' => '',
3940                                 'tip'    => wfMessage( 'sig_tip' )->text(),
3941                         ] : false,
3942                         [
3943                                 'id'     => 'mw-editbutton-hr',
3944                                 'open'   => "\n----\n",
3945                                 'close'  => '',
3946                                 'sample' => '',
3947                                 'tip'    => wfMessage( 'hr_tip' )->text(),
3948                         ]
3949                 ];
3950
3951                 $script = 'mw.loader.using("mediawiki.toolbar", function () {';
3952                 foreach ( $toolarray as $tool ) {
3953                         if ( !$tool ) {
3954                                 continue;
3955                         }
3956
3957                         $params = [
3958                                 // Images are defined in ResourceLoaderEditToolbarModule
3959                                 false,
3960                                 // Note that we use the tip both for the ALT tag and the TITLE tag of the image.
3961                                 // Older browsers show a "speedtip" type message only for ALT.
3962                                 // Ideally these should be different, realistically they
3963                                 // probably don't need to be.
3964                                 $tool['tip'],
3965                                 $tool['open'],
3966                                 $tool['close'],
3967                                 $tool['sample'],
3968                                 $tool['id'],
3969                         ];
3970
3971                         $script .= Xml::encodeJsCall(
3972                                 'mw.toolbar.addButton',
3973                                 $params,
3974                                 ResourceLoader::inDebugMode()
3975                         );
3976                 }
3977
3978                 $script .= '});';
3979                 $wgOut->addScript( ResourceLoader::makeInlineScript( $script ) );
3980
3981                 $toolbar = '<div id="toolbar"></div>';
3982
3983                 Hooks::run( 'EditPageBeforeEditToolbar', [ &$toolbar ] );
3984
3985                 return $toolbar;
3986         }
3987
3988         /**
3989          * Returns an array of html code of the following checkboxes:
3990          * minor and watch
3991          *
3992          * @param int $tabindex Current tabindex
3993          * @param array $checked Array of checkbox => bool, where bool indicates the checked
3994          *                 status of the checkbox
3995          *
3996          * @return array
3997          */
3998         public function getCheckboxes( &$tabindex, $checked ) {
3999                 global $wgUser, $wgUseMediaWikiUIEverywhere;
4000
4001                 $checkboxes = [];
4002
4003                 // don't show the minor edit checkbox if it's a new page or section
4004                 if ( !$this->isNew ) {
4005                         $checkboxes['minor'] = '';
4006                         $minorLabel = wfMessage( 'minoredit' )->parse();
4007                         if ( $wgUser->isAllowed( 'minoredit' ) ) {
4008                                 $attribs = [
4009                                         'tabindex' => ++$tabindex,
4010                                         'accesskey' => wfMessage( 'accesskey-minoredit' )->text(),
4011                                         'id' => 'wpMinoredit',
4012                                 ];
4013                                 $minorEditHtml =
4014                                         Xml::check( 'wpMinoredit', $checked['minor'], $attribs ) .
4015                                         "&#160;<label for='wpMinoredit' id='mw-editpage-minoredit'" .
4016                                         Xml::expandAttributes( [ 'title' => Linker::titleAttrib( 'minoredit', 'withaccess' ) ] ) .
4017                                         ">{$minorLabel}</label>";
4018
4019                                 if ( $wgUseMediaWikiUIEverywhere ) {
4020                                         $checkboxes['minor'] = Html::openElement( 'div', [ 'class' => 'mw-ui-checkbox' ] ) .
4021                                                 $minorEditHtml .
4022                                         Html::closeElement( 'div' );
4023                                 } else {
4024                                         $checkboxes['minor'] = $minorEditHtml;
4025                                 }
4026                         }
4027                 }
4028
4029                 $watchLabel = wfMessage( 'watchthis' )->parse();
4030                 $checkboxes['watch'] = '';
4031                 if ( $wgUser->isLoggedIn() ) {
4032                         $attribs = [
4033                                 'tabindex' => ++$tabindex,
4034                                 'accesskey' => wfMessage( 'accesskey-watch' )->text(),
4035                                 'id' => 'wpWatchthis',
4036                         ];
4037                         $watchThisHtml =
4038                                 Xml::check( 'wpWatchthis', $checked['watch'], $attribs ) .
4039                                 "&#160;<label for='wpWatchthis' id='mw-editpage-watch'" .
4040                                 Xml::expandAttributes( [ 'title' => Linker::titleAttrib( 'watch', 'withaccess' ) ] ) .
4041                                 ">{$watchLabel}</label>";
4042                         if ( $wgUseMediaWikiUIEverywhere ) {
4043                                 $checkboxes['watch'] = Html::openElement( 'div', [ 'class' => 'mw-ui-checkbox' ] ) .
4044                                         $watchThisHtml .
4045                                         Html::closeElement( 'div' );
4046                         } else {
4047                                 $checkboxes['watch'] = $watchThisHtml;
4048                         }
4049                 }
4050                 Hooks::run( 'EditPageBeforeEditChecks', [ &$this, &$checkboxes, &$tabindex ] );
4051                 return $checkboxes;
4052         }
4053
4054         /**
4055          * Returns an array of html code of the following buttons:
4056          * save, diff, preview and live
4057          *
4058          * @param int $tabindex Current tabindex
4059          *
4060          * @return array
4061          */
4062         public function getEditButtons( &$tabindex ) {
4063                 $buttons = [];
4064
4065                 $labelAsPublish =
4066                         $this->mArticle->getContext()->getConfig()->get( 'EditSubmitButtonLabelPublish' );
4067
4068                 // Can't use $this->isNew as that's also true if we're adding a new section to an extant page
4069                 if ( $labelAsPublish ) {
4070                         $buttonLabelKey = !$this->mTitle->exists() ? 'publishpage' : 'publishchanges';
4071                 } else {
4072                         $buttonLabelKey = !$this->mTitle->exists() ? 'savearticle' : 'savechanges';
4073                 }
4074                 $buttonLabel = wfMessage( $buttonLabelKey )->text();
4075                 $attribs = [
4076                         'id' => 'wpSave',
4077                         'name' => 'wpSave',
4078                         'tabindex' => ++$tabindex,
4079                 ] + Linker::tooltipAndAccesskeyAttribs( 'save' );
4080                 $buttons['save'] = Html::submitButton( $buttonLabel, $attribs, [ 'mw-ui-constructive' ] );
4081
4082                 ++$tabindex; // use the same for preview and live preview
4083                 $attribs = [
4084                         'id' => 'wpPreview',
4085                         'name' => 'wpPreview',
4086                         'tabindex' => $tabindex,
4087                 ] + Linker::tooltipAndAccesskeyAttribs( 'preview' );
4088                 $buttons['preview'] = Html::submitButton( wfMessage( 'showpreview' )->text(),
4089                         $attribs );
4090                 $buttons['live'] = '';
4091
4092                 $attribs = [
4093                         'id' => 'wpDiff',
4094                         'name' => 'wpDiff',
4095                         'tabindex' => ++$tabindex,
4096                 ] + Linker::tooltipAndAccesskeyAttribs( 'diff' );
4097                 $buttons['diff'] = Html::submitButton( wfMessage( 'showdiff' )->text(),
4098                         $attribs );
4099
4100                 Hooks::run( 'EditPageBeforeEditButtons', [ &$this, &$buttons, &$tabindex ] );
4101                 return $buttons;
4102         }
4103
4104         /**
4105          * Creates a basic error page which informs the user that
4106          * they have attempted to edit a nonexistent section.
4107          */
4108         function noSuchSectionPage() {
4109                 global $wgOut;
4110
4111                 $wgOut->prepareErrorPage( wfMessage( 'nosuchsectiontitle' ) );
4112
4113                 $res = wfMessage( 'nosuchsectiontext', $this->section )->parseAsBlock();
4114                 Hooks::run( 'EditPageNoSuchSection', [ &$this, &$res ] );
4115                 $wgOut->addHTML( $res );
4116
4117                 $wgOut->returnToMain( false, $this->mTitle );
4118         }
4119
4120         /**
4121          * Show "your edit contains spam" page with your diff and text
4122          *
4123          * @param string|array|bool $match Text (or array of texts) which triggered one or more filters
4124          */
4125         public function spamPageWithContent( $match = false ) {
4126                 global $wgOut, $wgLang;
4127                 $this->textbox2 = $this->textbox1;
4128
4129                 if ( is_array( $match ) ) {
4130                         $match = $wgLang->listToText( $match );
4131                 }
4132                 $wgOut->prepareErrorPage( wfMessage( 'spamprotectiontitle' ) );
4133
4134                 $wgOut->addHTML( '<div id="spamprotected">' );
4135                 $wgOut->addWikiMsg( 'spamprotectiontext' );
4136                 if ( $match ) {
4137                         $wgOut->addWikiMsg( 'spamprotectionmatch', wfEscapeWikiText( $match ) );
4138                 }
4139                 $wgOut->addHTML( '</div>' );
4140
4141                 $wgOut->wrapWikiMsg( '<h2>$1</h2>', "yourdiff" );
4142                 $this->showDiff();
4143
4144                 $wgOut->wrapWikiMsg( '<h2>$1</h2>', "yourtext" );
4145                 $this->showTextbox2();
4146
4147                 $wgOut->addReturnTo( $this->getContextTitle(), [ 'action' => 'edit' ] );
4148         }
4149
4150         /**
4151          * Check if the browser is on a blacklist of user-agents known to
4152          * mangle UTF-8 data on form submission. Returns true if Unicode
4153          * should make it through, false if it's known to be a problem.
4154          * @return bool
4155          */
4156         private function checkUnicodeCompliantBrowser() {
4157                 global $wgBrowserBlackList, $wgRequest;
4158
4159                 $currentbrowser = $wgRequest->getHeader( 'User-Agent' );
4160                 if ( $currentbrowser === false ) {
4161                         // No User-Agent header sent? Trust it by default...
4162                         return true;
4163                 }
4164
4165                 foreach ( $wgBrowserBlackList as $browser ) {
4166                         if ( preg_match( $browser, $currentbrowser ) ) {
4167                                 return false;
4168                         }
4169                 }
4170                 return true;
4171         }
4172
4173         /**
4174          * Filter an input field through a Unicode de-armoring process if it
4175          * came from an old browser with known broken Unicode editing issues.
4176          *
4177          * @param WebRequest $request
4178          * @param string $field
4179          * @return string
4180          */
4181         protected function safeUnicodeInput( $request, $field ) {
4182                 $text = rtrim( $request->getText( $field ) );
4183                 return $request->getBool( 'safemode' )
4184                         ? $this->unmakeSafe( $text )
4185                         : $text;
4186         }
4187
4188         /**
4189          * Filter an output field through a Unicode armoring process if it is
4190          * going to an old browser with known broken Unicode editing issues.
4191          *
4192          * @param string $text
4193          * @return string
4194          */
4195         protected function safeUnicodeOutput( $text ) {
4196                 return $this->checkUnicodeCompliantBrowser()
4197                         ? $text
4198                         : $this->makesafe( $text );
4199         }
4200
4201         /**
4202          * A number of web browsers are known to corrupt non-ASCII characters
4203          * in a UTF-8 text editing environment. To protect against this,
4204          * detected browsers will be served an armored version of the text,
4205          * with non-ASCII chars converted to numeric HTML character references.
4206          *
4207          * Preexisting such character references will have a 0 added to them
4208          * to ensure that round-trips do not alter the original data.
4209          *
4210          * @param string $invalue
4211          * @return string
4212          */
4213         private function makeSafe( $invalue ) {
4214                 // Armor existing references for reversibility.
4215                 $invalue = strtr( $invalue, [ "&#x" => "&#x0" ] );
4216
4217                 $bytesleft = 0;
4218                 $result = "";
4219                 $working = 0;
4220                 $valueLength = strlen( $invalue );
4221                 for ( $i = 0; $i < $valueLength; $i++ ) {
4222                         $bytevalue = ord( $invalue[$i] );
4223                         if ( $bytevalue <= 0x7F ) { // 0xxx xxxx
4224                                 $result .= chr( $bytevalue );
4225                                 $bytesleft = 0;
4226                         } elseif ( $bytevalue <= 0xBF ) { // 10xx xxxx
4227                                 $working = $working << 6;
4228                                 $working += ( $bytevalue & 0x3F );
4229                                 $bytesleft--;
4230                                 if ( $bytesleft <= 0 ) {
4231                                         $result .= "&#x" . strtoupper( dechex( $working ) ) . ";";
4232                                 }
4233                         } elseif ( $bytevalue <= 0xDF ) { // 110x xxxx
4234                                 $working = $bytevalue & 0x1F;
4235                                 $bytesleft = 1;
4236                         } elseif ( $bytevalue <= 0xEF ) { // 1110 xxxx
4237                                 $working = $bytevalue & 0x0F;
4238                                 $bytesleft = 2;
4239                         } else { // 1111 0xxx
4240                                 $working = $bytevalue & 0x07;
4241                                 $bytesleft = 3;
4242                         }
4243                 }
4244                 return $result;
4245         }
4246
4247         /**
4248          * Reverse the previously applied transliteration of non-ASCII characters
4249          * back to UTF-8. Used to protect data from corruption by broken web browsers
4250          * as listed in $wgBrowserBlackList.
4251          *
4252          * @param string $invalue
4253          * @return string
4254          */
4255         private function unmakeSafe( $invalue ) {
4256                 $result = "";
4257                 $valueLength = strlen( $invalue );
4258                 for ( $i = 0; $i < $valueLength; $i++ ) {
4259                         if ( ( substr( $invalue, $i, 3 ) == "&#x" ) && ( $invalue[$i + 3] != '0' ) ) {
4260                                 $i += 3;
4261                                 $hexstring = "";
4262                                 do {
4263                                         $hexstring .= $invalue[$i];
4264                                         $i++;
4265                                 } while ( ctype_xdigit( $invalue[$i] ) && ( $i < strlen( $invalue ) ) );
4266
4267                                 // Do some sanity checks. These aren't needed for reversibility,
4268                                 // but should help keep the breakage down if the editor
4269                                 // breaks one of the entities whilst editing.
4270                                 if ( ( substr( $invalue, $i, 1 ) == ";" ) && ( strlen( $hexstring ) <= 6 ) ) {
4271                                         $codepoint = hexdec( $hexstring );
4272                                         $result .= UtfNormal\Utils::codepointToUtf8( $codepoint );
4273                                 } else {
4274                                         $result .= "&#x" . $hexstring . substr( $invalue, $i, 1 );
4275                                 }
4276                         } else {
4277                                 $result .= substr( $invalue, $i, 1 );
4278                         }
4279                 }
4280                 // reverse the transform that we made for reversibility reasons.
4281                 return strtr( $result, [ "&#x0" => "&#x" ] );
4282         }
4283 }