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