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