includes/EditPage.php

   1 <?php
   2 /**
   3  * User interface for page editing.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 use MediaWiki\Logger\LoggerFactory;
  24 use MediaWiki\MediaWikiServices;
  25
  26 /**
  27  * The edit page/HTML interface (split from Article)
  28  * The actual database and text munging is still in Article,
  29  * but it should get easier to call those from alternate
  30  * interfaces.
  31  *
  32  * EditPage cares about two distinct titles:
  33  * $this->mContextTitle is the page that forms submit to, links point to,
  34  * redirects go to, etc. $this->mTitle (as well as $mArticle) is the
  35  * page in the database that is actually being edited. These are
  36  * usually the same, but they are now allowed to be different.
  37  *
  38  * Surgeon General's Warning: prolonged exposure to this class is known to cause
  39  * headaches, which may be fatal.
  40  */
  41 class EditPage {
  42         /**
  43          * Status: Article successfully updated
  44          */
  45         const AS_SUCCESS_UPDATE = 200;
  46
  47         /**
  48          * Status: Article successfully created
  49          */
  50         const AS_SUCCESS_NEW_ARTICLE = 201;
  51
  52         /**
  53          * Status: Article update aborted by a hook function
  54          */
  55         const AS_HOOK_ERROR = 210;
  56
  57         /**
  58          * Status: A hook function returned an error
  59          */
  60         const AS_HOOK_ERROR_EXPECTED = 212;
  61
  62         /**
  63          * Status: User is blocked from editing this page
  64          */
  65         const AS_BLOCKED_PAGE_FOR_USER = 215;
  66
  67         /**
  68          * Status: Content too big (> $wgMaxArticleSize)
  69          */
  70         const AS_CONTENT_TOO_BIG = 216;
  71
  72         /**
  73          * Status: this anonymous user is not allowed to edit this page
  74          */
  75         const AS_READ_ONLY_PAGE_ANON = 218;
  76
  77         /**
  78          * Status: this logged in user is not allowed to edit this page
  79          */
  80         const AS_READ_ONLY_PAGE_LOGGED = 219;
  81
  82         /**
  83          * Status: wiki is in readonly mode (wfReadOnly() == true)
  84          */
  85         const AS_READ_ONLY_PAGE = 220;
  86
  87         /**
  88          * Status: rate limiter for action 'edit' was tripped
  89          */
  90         const AS_RATE_LIMITED = 221;
  91
  92         /**
  93          * Status: article was deleted while editing and param wpRecreate == false or form
  94          * was not posted
  95          */
  96         const AS_ARTICLE_WAS_DELETED = 222;
  97
  98         /**
  99          * Status: user tried to create this page, but is not allowed to do that
 100          * ( Title->userCan('create') == false )
 101          */
 102         const AS_NO_CREATE_PERMISSION = 223;
 103
 104         /**
 105          * Status: user tried to create a blank page and wpIgnoreBlankArticle == false
 106          */
 107         const AS_BLANK_ARTICLE = 224;
 108
 109         /**
 110          * Status: (non-resolvable) edit conflict
 111          */
 112         const AS_CONFLICT_DETECTED = 225;
 113
 114         /**
 115          * Status: no edit summary given and the user has forceeditsummary set and the user is not
 116          * editing in his own userspace or talkspace and wpIgnoreBlankSummary == false
 117          */
 118         const AS_SUMMARY_NEEDED = 226;
 119
 120         /**
 121          * Status: user tried to create a new section without content
 122          */
 123         const AS_TEXTBOX_EMPTY = 228;
 124
 125         /**
 126          * Status: article is too big (> $wgMaxArticleSize), after merging in the new section
 127          */
 128         const AS_MAX_ARTICLE_SIZE_EXCEEDED = 229;
 129
 130         /**
 131          * Status: WikiPage::doEdit() was unsuccessful
 132          */
 133         const AS_END = 231;
 134
 135         /**
 136          * Status: summary contained spam according to one of the regexes in $wgSummarySpamRegex
 137          */
 138         const AS_SPAM_ERROR = 232;
 139
 140         /**
 141          * Status: anonymous user is not allowed to upload (User::isAllowed('upload') == false)
 142          */
 143         const AS_IMAGE_REDIRECT_ANON = 233;
 144
 145         /**
 146          * Status: logged in user is not allowed to upload (User::isAllowed('upload') == false)
 147          */
 148         const AS_IMAGE_REDIRECT_LOGGED = 234;
 149
 150         /**
 151          * Status: user tried to modify the content model, but is not allowed to do that
 152          * ( User::isAllowed('editcontentmodel') == false )
 153          */
 154         const AS_NO_CHANGE_CONTENT_MODEL = 235;
 155
 156         /**
 157          * Status: user tried to create self-redirect (redirect to the same article) and
 158          * wpIgnoreSelfRedirect == false
 159          */
 160         const AS_SELF_REDIRECT = 236;
 161
 162         /**
 163          * Status: an error relating to change tagging. Look at the message key for
 164          * more details
 165          */
 166         const AS_CHANGE_TAG_ERROR = 237;
 167
 168         /**
 169          * Status: can't parse content
 170          */
 171         const AS_PARSE_ERROR = 240;
 172
 173         /**
 174          * Status: when changing the content model is disallowed due to
 175          * $wgContentHandlerUseDB being false
 176          */
 177         const AS_CANNOT_USE_CUSTOM_MODEL = 241;
 178
 179         /**
 180          * HTML id and name for the beginning of the edit form.
 181          */
 182         const EDITFORM_ID = 'editform';
 183
 184         /**
 185          * Prefix of key for cookie used to pass post-edit state.
 186          * The revision id edited is added after this
 187          */
 188         const POST_EDIT_COOKIE_KEY_PREFIX = 'PostEditRevision';
 189
 190         /**
 191          * Duration of PostEdit cookie, in seconds.
 192          * The cookie will be removed instantly if the JavaScript runs.
 193          *
 194          * Otherwise, though, we don't want the cookies to accumulate.
 195          * RFC 2109 ( https://www.ietf.org/rfc/rfc2109.txt ) specifies a possible
 196          * limit of only 20 cookies per domain. This still applies at least to some
 197          * versions of IE without full updates:
 198          * https://blogs.msdn.com/b/ieinternals/archive/2009/08/20/wininet-ie-cookie-internals-faq.aspx
 199          *
 200          * A value of 20 minutes should be enough to take into account slow loads and minor
 201          * clock skew while still avoiding cookie accumulation when JavaScript is turned off.
 202          */
 203         const POST_EDIT_COOKIE_DURATION = 1200;
 204
 205         /** @var Article */
 206         public $mArticle;
 207         /** @var WikiPage */
 208         private $page;
 209
 210         /** @var Title */
 211         public $mTitle;
 212
 213         /** @var null|Title */
 214         private $mContextTitle = null;
 215
 216         /** @var string */
 217         public $action = 'submit';
 218
 219         /** @var bool */
 220         public $isConflict = false;
 221
 222         /** @var bool */
 223         public $isCssJsSubpage = false;
 224
 225         /** @var bool */
 226         public $isCssSubpage = false;
 227
 228         /** @var bool */
 229         public $isJsSubpage = false;
 230
 231         /** @var bool */
 232         public $isWrongCaseCssJsPage = false;
 233
 234         /** @var bool New page or new section */
 235         public $isNew = false;
 236
 237         /** @var bool */
 238         public $deletedSinceEdit;
 239
 240         /** @var string */
 241         public $formtype;
 242
 243         /** @var bool */
 244         public $firsttime;
 245
 246         /** @var bool|stdClass */
 247         public $lastDelete;
 248
 249         /** @var bool */
 250         public $mTokenOk = false;
 251
 252         /** @var bool */
 253         public $mTokenOkExceptSuffix = false;
 254
 255         /** @var bool */
 256         public $mTriedSave = false;
 257
 258         /** @var bool */
 259         public $incompleteForm = false;
 260
 261         /** @var bool */
 262         public $tooBig = 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 integer */
 339         private $editRevId = null;
 340
 341         /** @var string */
 342         public $section = '';
 343
 344         /** @var string */
 345         public $sectiontitle = '';
 346
 347         /** @var string */
 348         public $starttime = '';
 349
 350         /** @var int */
 351         public $oldid = 0;
 352
 353         /** @var int */
 354         public $parentRevId = 0;
 355
 356         /** @var string */
 357         public $editintro = '';
 358
 359         /** @var null */
 360         public $scrolltop = null;
 361
 362         /** @var bool */
 363         public $bot = true;
 364
 365         /** @var null|string */
 366         public $contentModel = null;
 367
 368         /** @var null|string */
 369         public $contentFormat = null;
 370
 371         /** @var null|array */
 372         private $changeTags = null;
 373
 374         # Placeholders for text injection by hooks (must be HTML)
 375         # extensions should take care to _append_ to the present value
 376
 377         /** @var string Before even the preview */
 378         public $editFormPageTop = '';
 379         public $editFormTextTop = '';
 380         public $editFormTextBeforeContent = '';
 381         public $editFormTextAfterWarn = '';
 382         public $editFormTextAfterTools = '';
 383         public $editFormTextBottom = '';
 384         public $editFormTextAfterContent = '';
 385         public $previewTextAfterContent = '';
 386         public $mPreloadContent = null;
 387
 388         /* $didSave should be set to true whenever an article was successfully altered. */
 389         public $didSave = false;
 390         public $undidRev = 0;
 391
 392         public $suppressIntro = false;
 393
 394         /** @var bool */
 395         protected $edit;
 396
 397         /** @var bool|int */
 398         protected $contentLength = false;
 399
 400         /**
 401          * @var bool Set in ApiEditPage, based on ContentHandler::allowsDirectApiEditing
 402          */
 403         private $enableApiEditOverride = false;
 404
 405         /**
 406          * @var IContextSource
 407          */
 408         protected $context;
 409
 410         /**
 411          * @param Article $article
 412          */
 413         public function __construct( Article $article ) {
 414                 $this->mArticle = $article;
 415                 $this->page = $article->getPage(); // model object
 416                 $this->mTitle = $article->getTitle();
 417                 $this->context = $article->getContext();
 418
 419                 $this->contentModel = $this->mTitle->getContentModel();
 420
 421                 $handler = ContentHandler::getForModelID( $this->contentModel );
 422                 $this->contentFormat = $handler->getDefaultFormat();
 423         }
 424
 425         /**
 426          * @return Article
 427          */
 428         public function getArticle() {
 429                 return $this->mArticle;
 430         }
 431
 432         /**
 433          * @since 1.28
 434          * @return IContextSource
 435          */
 436         public function getContext() {
 437                 return $this->context;
 438         }
 439
 440         /**
 441          * @since 1.19
 442          * @return Title
 443          */
 444         public function getTitle() {
 445                 return $this->mTitle;
 446         }
 447
 448         /**
 449          * Set the context Title object
 450          *
 451          * @param Title|null $title Title object or null
 452          */
 453         public function setContextTitle( $title ) {
 454                 $this->mContextTitle = $title;
 455         }
 456
 457         /**
 458          * Get the context title object.
 459          * If not set, $wgTitle will be returned. This behavior might change in
 460          * the future to return $this->mTitle instead.
 461          *
 462          * @return Title
 463          */
 464         public function getContextTitle() {
 465                 if ( is_null( $this->mContextTitle ) ) {
 466                         global $wgTitle;
 467                         return $wgTitle;
 468                 } else {
 469                         return $this->mContextTitle;
 470                 }
 471         }
 472
 473         /**
 474          * Returns if the given content model is editable.
 475          *
 476          * @param string $modelId The ID of the content model to test. Use CONTENT_MODEL_XXX constants.
 477          * @return bool
 478          * @throws MWException If $modelId has no known handler
 479          */
 480         public function isSupportedContentModel( $modelId ) {
 481                 return $this->enableApiEditOverride === true ||
 482                         ContentHandler::getForModelID( $modelId )->supportsDirectEditing();
 483         }
 484
 485         /**
 486          * Allow editing of content that supports API direct editing, but not general
 487          * direct editing. Set to false by default.
 488          *
 489          * @param bool $enableOverride
 490          */
 491         public function setApiEditOverride( $enableOverride ) {
 492                 $this->enableApiEditOverride = $enableOverride;
 493         }
 494
 495         function submit() {
 496                 $this->edit();
 497         }
 498
 499         /**
 500          * This is the function that gets called for "action=edit". It
 501          * sets up various member variables, then passes execution to
 502          * another function, usually showEditForm()
 503          *
 504          * The edit form is self-submitting, so that when things like
 505          * preview and edit conflicts occur, we get the same form back
 506          * with the extra stuff added.  Only when the final submission
 507          * is made and all is well do we actually save and redirect to
 508          * the newly-edited page.
 509          */
 510         function edit() {
 511                 global $wgOut, $wgRequest, $wgUser;
 512                 // Allow extensions to modify/prevent this form or submission
 513                 if ( !Hooks::run( 'AlternateEdit', [ $this ] ) ) {
 514                         return;
 515                 }
 516
 517                 wfDebug( __METHOD__ . ": enter\n" );
 518
 519                 // If they used redlink=1 and the page exists, redirect to the main article
 520                 if ( $wgRequest->getBool( 'redlink' ) && $this->mTitle->exists() ) {
 521                         $wgOut->redirect( $this->mTitle->getFullURL() );
 522                         return;
 523                 }
 524
 525                 $this->importFormData( $wgRequest );
 526                 $this->firsttime = false;
 527
 528                 if ( wfReadOnly() && $this->save ) {
 529                         // Force preview
 530                         $this->save = false;
 531                         $this->preview = true;
 532                 }
 533
 534                 if ( $this->save ) {
 535                         $this->formtype = 'save';
 536                 } elseif ( $this->preview ) {
 537                         $this->formtype = 'preview';
 538                 } elseif ( $this->diff ) {
 539                         $this->formtype = 'diff';
 540                 } else { # First time through
 541                         $this->firsttime = true;
 542                         if ( $this->previewOnOpen() ) {
 543                                 $this->formtype = 'preview';
 544                         } else {
 545                                 $this->formtype = 'initial';
 546                         }
 547                 }
 548
 549                 $permErrors = $this->getEditPermissionErrors( $this->save ? 'secure' : 'full' );
 550                 if ( $permErrors ) {
 551                         wfDebug( __METHOD__ . ": User can't edit\n" );
 552                         // Auto-block user's IP if the account was "hard" blocked
 553                         if ( !wfReadOnly() ) {
 554                                 $user = $wgUser;
 555                                 DeferredUpdates::addCallableUpdate( function () use ( $user ) {
 556                                         $user->spreadAnyEditBlock();
 557                                 } );
 558                         }
 559                         $this->displayPermissionsError( $permErrors );
 560
 561                         return;
 562                 }
 563
 564                 $revision = $this->mArticle->getRevisionFetched();
 565                 // Disallow editing revisions with content models different from the current one
 566                 // Undo edits being an exception in order to allow reverting content model changes.
 567                 if ( $revision
 568                         && $revision->getContentModel() !== $this->contentModel
 569                 ) {
 570                         $prevRev = null;
 571                         if ( $this->undidRev ) {
 572                                 $undidRevObj = Revision::newFromId( $this->undidRev );
 573                                 $prevRev = $undidRevObj ? $undidRevObj->getPrevious() : null;
 574                         }
 575                         if ( !$this->undidRev
 576                                 || !$prevRev
 577                                 || $prevRev->getContentModel() !== $this->contentModel
 578                         ) {
 579                                 $this->displayViewSourcePage(
 580                                         $this->getContentObject(),
 581                                         $this->context->msg(
 582                                                 'contentmodelediterror',
 583                                                 $revision->getContentModel(),
 584                                                 $this->contentModel
 585                                         )->plain()
 586                                 );
 587                                 return;
 588                         }
 589                 }
 590
 591                 $this->isConflict = false;
 592                 // css / js subpages of user pages get a special treatment
 593                 $this->isCssJsSubpage = $this->mTitle->isCssJsSubpage();
 594                 $this->isCssSubpage = $this->mTitle->isCssSubpage();
 595                 $this->isJsSubpage = $this->mTitle->isJsSubpage();
 596                 // @todo FIXME: Silly assignment.
 597                 $this->isWrongCaseCssJsPage = $this->isWrongCaseCssJsPage();
 598
 599                 # Show applicable editing introductions
 600                 if ( $this->formtype == 'initial' || $this->firsttime ) {
 601                         $this->showIntro();
 602                 }
 603
 604                 # Attempt submission here.  This will check for edit conflicts,
 605                 # and redundantly check for locked database, blocked IPs, etc.
 606                 # that edit() already checked just in case someone tries to sneak
 607                 # in the back door with a hand-edited submission URL.
 608
 609                 if ( 'save' == $this->formtype ) {
 610                         $resultDetails = null;
 611                         $status = $this->attemptSave( $resultDetails );
 612                         if ( !$this->handleStatus( $status, $resultDetails ) ) {
 613                                 return;
 614                         }
 615                 }
 616
 617                 # First time through: get contents, set time for conflict
 618                 # checking, etc.
 619                 if ( 'initial' == $this->formtype || $this->firsttime ) {
 620                         if ( $this->initialiseForm() === false ) {
 621                                 $this->noSuchSectionPage();
 622                                 return;
 623                         }
 624
 625                         if ( !$this->mTitle->getArticleID() ) {
 626                                 Hooks::run( 'EditFormPreloadText', [ &$this->textbox1, &$this->mTitle ] );
 627                         } else {
 628                                 Hooks::run( 'EditFormInitialText', [ $this ] );
 629                         }
 630
 631                 }
 632
 633                 $this->showEditForm();
 634         }
 635
 636         /**
 637          * @param string $rigor Same format as Title::getUserPermissionErrors()
 638          * @return array
 639          */
 640         protected function getEditPermissionErrors( $rigor = 'secure' ) {
 641                 global $wgUser;
 642
 643                 $permErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser, $rigor );
 644                 # Can this title be created?
 645                 if ( !$this->mTitle->exists() ) {
 646                         $permErrors = array_merge(
 647                                 $permErrors,
 648                                 wfArrayDiff2(
 649                                         $this->mTitle->getUserPermissionsErrors( 'create', $wgUser, $rigor ),
 650                                         $permErrors
 651                                 )
 652                         );
 653                 }
 654                 # Ignore some permissions errors when a user is just previewing/viewing diffs
 655                 $remove = [];
 656                 foreach ( $permErrors as $error ) {
 657                         if ( ( $this->preview || $this->diff )
 658                                 && ( $error[0] == 'blockedtext' || $error[0] == 'autoblockedtext' )
 659                         ) {
 660                                 $remove[] = $error;
 661                         }
 662                 }
 663                 $permErrors = wfArrayDiff2( $permErrors, $remove );
 664
 665                 return $permErrors;
 666         }
 667
 668         /**
 669          * Display a permissions error page, like OutputPage::showPermissionsErrorPage(),
 670          * but with the following differences:
 671          * - If redlink=1, the user will be redirected to the page
 672          * - If there is content to display or the error occurs while either saving,
 673          *   previewing or showing the difference, it will be a
 674          *   "View source for ..." page displaying the source code after the error message.
 675          *
 676          * @since 1.19
 677          * @param array $permErrors Array of permissions errors, as returned by
 678          *    Title::getUserPermissionsErrors().
 679          * @throws PermissionsError
 680          */
 681         protected function displayPermissionsError( array $permErrors ) {
 682                 global $wgRequest, $wgOut;
 683
 684                 if ( $wgRequest->getBool( 'redlink' ) ) {
 685                         // The edit page was reached via a red link.
 686                         // Redirect to the article page and let them click the edit tab if
 687                         // they really want a permission error.
 688                         $wgOut->redirect( $this->mTitle->getFullURL() );
 689                         return;
 690                 }
 691
 692                 $content = $this->getContentObject();
 693
 694                 # Use the normal message if there's nothing to display
 695                 if ( $this->firsttime && ( !$content || $content->isEmpty() ) ) {
 696                         $action = $this->mTitle->exists() ? 'edit' :
 697                                 ( $this->mTitle->isTalkPage() ? 'createtalk' : 'createpage' );
 698                         throw new PermissionsError( $action, $permErrors );
 699                 }
 700
 701                 $this->displayViewSourcePage(
 702                         $content,
 703                         $wgOut->formatPermissionsErrorMessage( $permErrors, 'edit' )
 704                 );
 705         }
 706
 707         /**
 708          * Display a read-only View Source page
 709          * @param Content $content content object
 710          * @param string $errorMessage additional wikitext error message to display
 711          */
 712         protected function displayViewSourcePage( Content $content, $errorMessage = '' ) {
 713                 global $wgOut;
 714
 715                 Hooks::run( 'EditPage::showReadOnlyForm:initial', [ $this, &$wgOut ] );
 716
 717                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
 718                 $wgOut->setPageTitle( $this->context->msg(
 719                         'viewsource-title',
 720                         $this->getContextTitle()->getPrefixedText()
 721                 ) );
 722                 $wgOut->addBacklinkSubtitle( $this->getContextTitle() );
 723                 $wgOut->addHTML( $this->editFormPageTop );
 724                 $wgOut->addHTML( $this->editFormTextTop );
 725
 726                 if ( $errorMessage !== '' ) {
 727                         $wgOut->addWikiText( $errorMessage );
 728                         $wgOut->addHTML( "<hr />\n" );
 729                 }
 730
 731                 # If the user made changes, preserve them when showing the markup
 732                 # (This happens when a user is blocked during edit, for instance)
 733                 if ( !$this->firsttime ) {
 734                         $text = $this->textbox1;
 735                         $wgOut->addWikiMsg( 'viewyourtext' );
 736                 } else {
 737                         try {
 738                                 $text = $this->toEditText( $content );
 739                         } catch ( MWException $e ) {
 740                                 # Serialize using the default format if the content model is not supported
 741                                 # (e.g. for an old revision with a different model)
 742                                 $text = $content->serialize();
 743                         }
 744                         $wgOut->addWikiMsg( 'viewsourcetext' );
 745                 }
 746
 747                 $wgOut->addHTML( $this->editFormTextBeforeContent );
 748                 $this->showTextbox( $text, 'wpTextbox1', [ 'readonly' ] );
 749                 $wgOut->addHTML( $this->editFormTextAfterContent );
 750
 751                 $wgOut->addHTML( $this->makeTemplatesOnThisPageList( $this->getTemplates() ) );
 752
 753                 $wgOut->addModules( 'mediawiki.action.edit.collapsibleFooter' );
 754
 755                 $wgOut->addHTML( $this->editFormTextBottom );
 756                 if ( $this->mTitle->exists() ) {
 757                         $wgOut->returnToMain( null, $this->mTitle );
 758                 }
 759         }
 760
 761         /**
 762          * Should we show a preview when the edit form is first shown?
 763          *
 764          * @return bool
 765          */
 766         protected function previewOnOpen() {
 767                 global $wgRequest, $wgUser, $wgPreviewOnOpenNamespaces;
 768                 if ( $wgRequest->getVal( 'preview' ) == 'yes' ) {
 769                         // Explicit override from request
 770                         return true;
 771                 } elseif ( $wgRequest->getVal( 'preview' ) == 'no' ) {
 772                         // Explicit override from request
 773                         return false;
 774                 } elseif ( $this->section == 'new' ) {
 775                         // Nothing *to* preview for new sections
 776                         return false;
 777                 } elseif ( ( $wgRequest->getVal( 'preload' ) !== null || $this->mTitle->exists() )
 778                         && $wgUser->getOption( 'previewonfirst' )
 779                 ) {
 780                         // Standard preference behavior
 781                         return true;
 782                 } elseif ( !$this->mTitle->exists()
 783                         && isset( $wgPreviewOnOpenNamespaces[$this->mTitle->getNamespace()] )
 784                         && $wgPreviewOnOpenNamespaces[$this->mTitle->getNamespace()]
 785                 ) {
 786                         // Categories are special
 787                         return true;
 788                 } else {
 789                         return false;
 790                 }
 791         }
 792
 793         /**
 794          * Checks whether the user entered a skin name in uppercase,
 795          * e.g. "User:Example/Monobook.css" instead of "monobook.css"
 796          *
 797          * @return bool
 798          */
 799         protected function isWrongCaseCssJsPage() {
 800                 if ( $this->mTitle->isCssJsSubpage() ) {
 801                         $name = $this->mTitle->getSkinFromCssJsSubpage();
 802                         $skins = array_merge(
 803                                 array_keys( Skin::getSkinNames() ),
 804                                 [ 'common' ]
 805                         );
 806                         return !in_array( $name, $skins )
 807                                 && in_array( strtolower( $name ), $skins );
 808                 } else {
 809                         return false;
 810                 }
 811         }
 812
 813         /**
 814          * Returns whether section editing is supported for the current page.
 815          * Subclasses may override this to replace the default behavior, which is
 816          * to check ContentHandler::supportsSections.
 817          *
 818          * @return bool True if this edit page supports sections, false otherwise.
 819          */
 820         protected function isSectionEditSupported() {
 821                 $contentHandler = ContentHandler::getForTitle( $this->mTitle );
 822                 return $contentHandler->supportsSections();
 823         }
 824
 825         /**
 826          * This function collects the form data and uses it to populate various member variables.
 827          * @param WebRequest $request
 828          * @throws ErrorPageError
 829          */
 830         function importFormData( &$request ) {
 831                 global $wgContLang, $wgUser;
 832
 833                 # Section edit can come from either the form or a link
 834                 $this->section = $request->getVal( 'wpSection', $request->getVal( 'section' ) );
 835
 836                 if ( $this->section !== null && $this->section !== '' && !$this->isSectionEditSupported() ) {
 837                         throw new ErrorPageError( 'sectioneditnotsupported-title', 'sectioneditnotsupported-text' );
 838                 }
 839
 840                 $this->isNew = !$this->mTitle->exists() || $this->section == 'new';
 841
 842                 if ( $request->wasPosted() ) {
 843                         # These fields need to be checked for encoding.
 844                         # Also remove trailing whitespace, but don't remove _initial_
 845                         # whitespace from the text boxes. This may be significant formatting.
 846                         $this->textbox1 = $this->safeUnicodeInput( $request, 'wpTextbox1' );
 847                         if ( !$request->getCheck( 'wpTextbox2' ) ) {
 848                                 // Skip this if wpTextbox2 has input, it indicates that we came
 849                                 // from a conflict page with raw page text, not a custom form
 850                                 // modified by subclasses
 851                                 $textbox1 = $this->importContentFormData( $request );
 852                                 if ( $textbox1 !== null ) {
 853                                         $this->textbox1 = $textbox1;
 854                                 }
 855                         }
 856
 857                         # Truncate for whole multibyte characters
 858                         $this->summary = $wgContLang->truncate( $request->getText( 'wpSummary' ), 255 );
 859
 860                         # If the summary consists of a heading, e.g. '==Foobar==', extract the title from the
 861                         # header syntax, e.g. 'Foobar'. This is mainly an issue when we are using wpSummary for
 862                         # section titles.
 863                         $this->summary = preg_replace( '/^\s*=+\s*(.*?)\s*=+\s*$/', '$1', $this->summary );
 864
 865                         # Treat sectiontitle the same way as summary.
 866                         # Note that wpSectionTitle is not yet a part of the actual edit form, as wpSummary is
 867                         # currently doing double duty as both edit summary and section title. Right now this
 868                         # is just to allow API edits to work around this limitation, but this should be
 869                         # incorporated into the actual edit form when EditPage is rewritten (Bugs 18654, 26312).
 870                         $this->sectiontitle = $wgContLang->truncate( $request->getText( 'wpSectionTitle' ), 255 );
 871                         $this->sectiontitle = preg_replace( '/^\s*=+\s*(.*?)\s*=+\s*$/', '$1', $this->sectiontitle );
 872
 873                         $this->edittime = $request->getVal( 'wpEdittime' );
 874                         $this->editRevId = $request->getIntOrNull( 'editRevId' );
 875                         $this->starttime = $request->getVal( 'wpStarttime' );
 876
 877                         $undidRev = $request->getInt( 'wpUndidRevision' );
 878                         if ( $undidRev ) {
 879                                 $this->undidRev = $undidRev;
 880                         }
 881
 882                         $this->scrolltop = $request->getIntOrNull( 'wpScrolltop' );
 883
 884                         if ( $this->textbox1 === '' && $request->getVal( 'wpTextbox1' ) === null ) {
 885                                 // wpTextbox1 field is missing, possibly due to being "too big"
 886                                 // according to some filter rules such as Suhosin's setting for
 887                                 // suhosin.request.max_value_length (d'oh)
 888                                 $this->incompleteForm = true;
 889                         } else {
 890                                 // If we receive the last parameter of the request, we can fairly
 891                                 // claim the POST request has not been truncated.
 892
 893                                 // TODO: softened the check for cutover.  Once we determine
 894                                 // that it is safe, we should complete the transition by
 895                                 // removing the "edittime" clause.
 896                                 $this->incompleteForm = ( !$request->getVal( 'wpUltimateParam' )
 897                                         && is_null( $this->edittime ) );
 898                         }
 899                         if ( $this->incompleteForm ) {
 900                                 # If the form is incomplete, force to preview.
 901                                 wfDebug( __METHOD__ . ": Form data appears to be incomplete\n" );
 902                                 wfDebug( "POST DATA: " . var_export( $_POST, true ) . "\n" );
 903                                 $this->preview = true;
 904                         } else {
 905                                 $this->preview = $request->getCheck( 'wpPreview' );
 906                                 $this->diff = $request->getCheck( 'wpDiff' );
 907
 908                                 // Remember whether a save was requested, so we can indicate
 909                                 // if we forced preview due to session failure.
 910                                 $this->mTriedSave = !$this->preview;
 911
 912                                 if ( $this->tokenOk( $request ) ) {
 913                                         # Some browsers will not report any submit button
 914                                         # if the user hits enter in the comment box.
 915                                         # The unmarked state will be assumed to be a save,
 916                                         # if the form seems otherwise complete.
 917                                         wfDebug( __METHOD__ . ": Passed token check.\n" );
 918                                 } elseif ( $this->diff ) {
 919                                         # Failed token check, but only requested "Show Changes".
 920                                         wfDebug( __METHOD__ . ": Failed token check; Show Changes requested.\n" );
 921                                 } else {
 922                                         # Page might be a hack attempt posted from
 923                                         # an external site. Preview instead of saving.
 924                                         wfDebug( __METHOD__ . ": Failed token check; forcing preview\n" );
 925                                         $this->preview = true;
 926                                 }
 927                         }
 928                         $this->save = !$this->preview && !$this->diff;
 929                         if ( !preg_match( '/^\d{14}$/', $this->edittime ) ) {
 930                                 $this->edittime = null;
 931                         }
 932
 933                         if ( !preg_match( '/^\d{14}$/', $this->starttime ) ) {
 934                                 $this->starttime = null;
 935                         }
 936
 937                         $this->recreate = $request->getCheck( 'wpRecreate' );
 938
 939                         $this->minoredit = $request->getCheck( 'wpMinoredit' );
 940                         $this->watchthis = $request->getCheck( 'wpWatchthis' );
 941
 942                         # Don't force edit summaries when a user is editing their own user or talk page
 943                         if ( ( $this->mTitle->mNamespace == NS_USER || $this->mTitle->mNamespace == NS_USER_TALK )
 944                                 && $this->mTitle->getText() == $wgUser->getName()
 945                         ) {
 946                                 $this->allowBlankSummary = true;
 947                         } else {
 948                                 $this->allowBlankSummary = $request->getBool( 'wpIgnoreBlankSummary' )
 949                                         || !$wgUser->getOption( 'forceeditsummary' );
 950                         }
 951
 952                         $this->autoSumm = $request->getText( 'wpAutoSummary' );
 953
 954                         $this->allowBlankArticle = $request->getBool( 'wpIgnoreBlankArticle' );
 955                         $this->allowSelfRedirect = $request->getBool( 'wpIgnoreSelfRedirect' );
 956
 957                         $changeTags = $request->getVal( 'wpChangeTags' );
 958                         if ( is_null( $changeTags ) || $changeTags === '' ) {
 959                                 $this->changeTags = [];
 960                         } else {
 961                                 $this->changeTags = array_filter( array_map( 'trim', explode( ',',
 962                                         $changeTags ) ) );
 963                         }
 964                 } else {
 965                         # Not a posted form? Start with nothing.
 966                         wfDebug( __METHOD__ . ": Not a posted form.\n" );
 967                         $this->textbox1 = '';
 968                         $this->summary = '';
 969                         $this->sectiontitle = '';
 970                         $this->edittime = '';
 971                         $this->editRevId = null;
 972                         $this->starttime = wfTimestampNow();
 973                         $this->edit = false;
 974                         $this->preview = false;
 975                         $this->save = false;
 976                         $this->diff = false;
 977                         $this->minoredit = false;
 978                         // Watch may be overridden by request parameters
 979                         $this->watchthis = $request->getBool( 'watchthis', false );
 980                         $this->recreate = false;
 981
 982                         // When creating a new section, we can preload a section title by passing it as the
 983                         // preloadtitle parameter in the URL (Bug 13100)
 984                         if ( $this->section == 'new' && $request->getVal( 'preloadtitle' ) ) {
 985                                 $this->sectiontitle = $request->getVal( 'preloadtitle' );
 986                                 // Once wpSummary isn't being use for setting section titles, we should delete this.
 987                                 $this->summary = $request->getVal( 'preloadtitle' );
 988                         } elseif ( $this->section != 'new' && $request->getVal( 'summary' ) ) {
 989                                 $this->summary = $request->getText( 'summary' );
 990                                 if ( $this->summary !== '' ) {
 991                                         $this->hasPresetSummary = true;
 992                                 }
 993                         }
 994
 995                         if ( $request->getVal( 'minor' ) ) {
 996                                 $this->minoredit = true;
 997                         }
 998                 }
 999
1000                 $this->oldid = $request->getInt( 'oldid' );
1001                 $this->parentRevId = $request->getInt( 'parentRevId' );
1002
1003                 $this->bot = $request->getBool( 'bot', true );
1004                 $this->nosummary = $request->getBool( 'nosummary' );
1005
1006                 // May be overridden by revision.
1007                 $this->contentModel = $request->getText( 'model', $this->contentModel );
1008                 // May be overridden by revision.
1009                 $this->contentFormat = $request->getText( 'format', $this->contentFormat );
1010
1011                 try {
1012                         $handler = ContentHandler::getForModelID( $this->contentModel );
1013                 } catch ( MWUnknownContentModelException $e ) {
1014                         throw new ErrorPageError(
1015                                 'editpage-invalidcontentmodel-title',
1016                                 'editpage-invalidcontentmodel-text',
1017                                 [ $this->contentModel ]
1018                         );
1019                 }
1020
1021                 if ( !$handler->isSupportedFormat( $this->contentFormat ) ) {
1022                         throw new ErrorPageError(
1023                                 'editpage-notsupportedcontentformat-title',
1024                                 'editpage-notsupportedcontentformat-text',
1025                                 [ $this->contentFormat, ContentHandler::getLocalizedName( $this->contentModel ) ]
1026                         );
1027                 }
1028
1029                 /**
1030                  * @todo Check if the desired model is allowed in this namespace, and if
1031                  *   a transition from the page's current model to the new model is
1032                  *   allowed.
1033                  */
1034
1035                 $this->editintro = $request->getText( 'editintro',
1036                         // Custom edit intro for new sections
1037                         $this->section === 'new' ? 'MediaWiki:addsection-editintro' : '' );
1038
1039                 // Allow extensions to modify form data
1040                 Hooks::run( 'EditPage::importFormData', [ $this, $request ] );
1041
1042         }
1043
1044         /**
1045          * Subpage overridable method for extracting the page content data from the
1046          * posted form to be placed in $this->textbox1, if using customized input
1047          * this method should be overridden and return the page text that will be used
1048          * for saving, preview parsing and so on...
1049          *
1050          * @param WebRequest $request
1051          * @return string|null
1052          */
1053         protected function importContentFormData( &$request ) {
1054                 return; // Don't do anything, EditPage already extracted wpTextbox1
1055         }
1056
1057         /**
1058          * Initialise form fields in the object
1059          * Called on the first invocation, e.g. when a user clicks an edit link
1060          * @return bool If the requested section is valid
1061          */
1062         function initialiseForm() {
1063                 global $wgUser;
1064                 $this->edittime = $this->page->getTimestamp();
1065                 $this->editRevId = $this->page->getLatest();
1066
1067                 $content = $this->getContentObject( false ); # TODO: track content object?!
1068                 if ( $content === false ) {
1069                         return false;
1070                 }
1071                 $this->textbox1 = $this->toEditText( $content );
1072
1073                 // activate checkboxes if user wants them to be always active
1074                 # Sort out the "watch" checkbox
1075                 if ( $wgUser->getOption( 'watchdefault' ) ) {
1076                         # Watch all edits
1077                         $this->watchthis = true;
1078                 } elseif ( $wgUser->getOption( 'watchcreations' ) && !$this->mTitle->exists() ) {
1079                         # Watch creations
1080                         $this->watchthis = true;
1081                 } elseif ( $wgUser->isWatched( $this->mTitle ) ) {
1082                         # Already watched
1083                         $this->watchthis = true;
1084                 }
1085                 if ( $wgUser->getOption( 'minordefault' ) && !$this->isNew ) {
1086                         $this->minoredit = true;
1087                 }
1088                 if ( $this->textbox1 === false ) {
1089                         return false;
1090                 }
1091                 return true;
1092         }
1093
1094         /**
1095          * @param Content|null $def_content The default value to return
1096          *
1097          * @return Content|null Content on success, $def_content for invalid sections
1098          *
1099          * @since 1.21
1100          */
1101         protected function getContentObject( $def_content = null ) {
1102                 global $wgOut, $wgRequest, $wgUser, $wgContLang;
1103
1104                 $content = false;
1105
1106                 // For message page not locally set, use the i18n message.
1107                 // For other non-existent articles, use preload text if any.
1108                 if ( !$this->mTitle->exists() || $this->section == 'new' ) {
1109                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI && $this->section != 'new' ) {
1110                                 # If this is a system message, get the default text.
1111                                 $msg = $this->mTitle->getDefaultMessageText();
1112
1113                                 $content = $this->toEditContent( $msg );
1114                         }
1115                         if ( $content === false ) {
1116                                 # If requested, preload some text.
1117                                 $preload = $wgRequest->getVal( 'preload',
1118                                         // Custom preload text for new sections
1119                                         $this->section === 'new' ? 'MediaWiki:addsection-preload' : '' );
1120                                 $params = $wgRequest->getArray( 'preloadparams', [] );
1121
1122                                 $content = $this->getPreloadedContent( $preload, $params );
1123                         }
1124                 // For existing pages, get text based on "undo" or section parameters.
1125                 } else {
1126                         if ( $this->section != '' ) {
1127                                 // Get section edit text (returns $def_text for invalid sections)
1128                                 $orig = $this->getOriginalContent( $wgUser );
1129                                 $content = $orig ? $orig->getSection( $this->section ) : null;
1130
1131                                 if ( !$content ) {
1132                                         $content = $def_content;
1133                                 }
1134                         } else {
1135                                 $undoafter = $wgRequest->getInt( 'undoafter' );
1136                                 $undo = $wgRequest->getInt( 'undo' );
1137
1138                                 if ( $undo > 0 && $undoafter > 0 ) {
1139                                         $undorev = Revision::newFromId( $undo );
1140                                         $oldrev = Revision::newFromId( $undoafter );
1141
1142                                         # Sanity check, make sure it's the right page,
1143                                         # the revisions exist and they were not deleted.
1144                                         # Otherwise, $content will be left as-is.
1145                                         if ( !is_null( $undorev ) && !is_null( $oldrev ) &&
1146                                                 !$undorev->isDeleted( Revision::DELETED_TEXT ) &&
1147                                                 !$oldrev->isDeleted( Revision::DELETED_TEXT )
1148                                         ) {
1149                                                 $content = $this->page->getUndoContent( $undorev, $oldrev );
1150
1151                                                 if ( $content === false ) {
1152                                                         # Warn the user that something went wrong
1153                                                         $undoMsg = 'failure';
1154                                                 } else {
1155                                                         $oldContent = $this->page->getContent( Revision::RAW );
1156                                                         $popts = ParserOptions::newFromUserAndLang( $wgUser, $wgContLang );
1157                                                         $newContent = $content->preSaveTransform( $this->mTitle, $wgUser, $popts );
1158                                                         if ( $newContent->getModel() !== $oldContent->getModel() ) {
1159                                                                 // The undo may change content
1160                                                                 // model if its reverting the top
1161                                                                 // edit. This can result in
1162                                                                 // mismatched content model/format.
1163                                                                 $this->contentModel = $newContent->getModel();
1164                                                                 $this->contentFormat = $oldrev->getContentFormat();
1165                                                         }
1166
1167                                                         if ( $newContent->equals( $oldContent ) ) {
1168                                                                 # Tell the user that the undo results in no change,
1169                                                                 # i.e. the revisions were already undone.
1170                                                                 $undoMsg = 'nochange';
1171                                                                 $content = false;
1172                                                         } else {
1173                                                                 # Inform the user of our success and set an automatic edit summary
1174                                                                 $undoMsg = 'success';
1175
1176                                                                 # If we just undid one rev, use an autosummary
1177                                                                 $firstrev = $oldrev->getNext();
1178                                                                 if ( $firstrev && $firstrev->getId() == $undo ) {
1179                                                                         $userText = $undorev->getUserText();
1180                                                                         if ( $userText === '' ) {
1181                                                                                 $undoSummary = $this->context->msg(
1182                                                                                         'undo-summary-username-hidden',
1183                                                                                         $undo
1184                                                                                 )->inContentLanguage()->text();
1185                                                                         } else {
1186                                                                                 $undoSummary = $this->context->msg(
1187                                                                                         'undo-summary',
1188                                                                                         $undo,
1189                                                                                         $userText
1190                                                                                 )->inContentLanguage()->text();
1191                                                                         }
1192                                                                         if ( $this->summary === '' ) {
1193                                                                                 $this->summary = $undoSummary;
1194                                                                         } else {
1195                                                                                 $this->summary = $undoSummary . $this->context->msg( 'colon-separator' )
1196                                                                                         ->inContentLanguage()->text() . $this->summary;
1197                                                                         }
1198                                                                         $this->undidRev = $undo;
1199                                                                 }
1200                                                                 $this->formtype = 'diff';
1201                                                         }
1202                                                 }
1203                                         } else {
1204                                                 // Failed basic sanity checks.
1205                                                 // Older revisions may have been removed since the link
1206                                                 // was created, or we may simply have got bogus input.
1207                                                 $undoMsg = 'norev';
1208                                         }
1209
1210                                         // Messages: undo-success, undo-failure, undo-norev, undo-nochange
1211                                         $class = ( $undoMsg == 'success' ? '' : 'error ' ) . "mw-undo-{$undoMsg}";
1212                                         $this->editFormPageTop .= $wgOut->parse( "<div class=\"{$class}\">" .
1213                                                 $this->context->msg( 'undo-' . $undoMsg )->plain() . '</div>', true, /* interface */true );
1214                                 }
1215
1216                                 if ( $content === false ) {
1217                                         $content = $this->getOriginalContent( $wgUser );
1218                                 }
1219                         }
1220                 }
1221
1222                 return $content;
1223         }
1224
1225         /**
1226          * Get the content of the wanted revision, without section extraction.
1227          *
1228          * The result of this function can be used to compare user's input with
1229          * section replaced in its context (using WikiPage::replaceSectionAtRev())
1230          * to the original text of the edit.
1231          *
1232          * This differs from Article::getContent() that when a missing revision is
1233          * encountered the result will be null and not the
1234          * 'missing-revision' message.
1235          *
1236          * @since 1.19
1237          * @param User $user The user to get the revision for
1238          * @return Content|null
1239          */
1240         private function getOriginalContent( User $user ) {
1241                 if ( $this->section == 'new' ) {
1242                         return $this->getCurrentContent();
1243                 }
1244                 $revision = $this->mArticle->getRevisionFetched();
1245                 if ( $revision === null ) {
1246                         if ( !$this->contentModel ) {
1247                                 $this->contentModel = $this->getTitle()->getContentModel();
1248                         }
1249                         $handler = ContentHandler::getForModelID( $this->contentModel );
1250
1251                         return $handler->makeEmptyContent();
1252                 }
1253                 $content = $revision->getContent( Revision::FOR_THIS_USER, $user );
1254                 return $content;
1255         }
1256
1257         /**
1258          * Get the edit's parent revision ID
1259          *
1260          * The "parent" revision is the ancestor that should be recorded in this
1261          * page's revision history.  It is either the revision ID of the in-memory
1262          * article content, or in the case of a 3-way merge in order to rebase
1263          * across a recoverable edit conflict, the ID of the newer revision to
1264          * which we have rebased this page.
1265          *
1266          * @since 1.27
1267          * @return int Revision ID
1268          */
1269         public function getParentRevId() {
1270                 if ( $this->parentRevId ) {
1271                         return $this->parentRevId;
1272                 } else {
1273                         return $this->mArticle->getRevIdFetched();
1274                 }
1275         }
1276
1277         /**
1278          * Get the current content of the page. This is basically similar to
1279          * WikiPage::getContent( Revision::RAW ) except that when the page doesn't exist an empty
1280          * content object is returned instead of null.
1281          *
1282          * @since 1.21
1283          * @return Content
1284          */
1285         protected function getCurrentContent() {
1286                 $rev = $this->page->getRevision();
1287                 $content = $rev ? $rev->getContent( Revision::RAW ) : null;
1288
1289                 if ( $content === false || $content === null ) {
1290                         if ( !$this->contentModel ) {
1291                                 $this->contentModel = $this->getTitle()->getContentModel();
1292                         }
1293                         $handler = ContentHandler::getForModelID( $this->contentModel );
1294
1295                         return $handler->makeEmptyContent();
1296                 } elseif ( !$this->undidRev ) {
1297                         // Content models should always be the same since we error
1298                         // out if they are different before this point (in ->edit()).
1299                         // The exception being, during an undo, the current revision might
1300                         // differ from the prior revision.
1301                         $logger = LoggerFactory::getInstance( 'editpage' );
1302                         if ( $this->contentModel !== $rev->getContentModel() ) {
1303                                 $logger->warning( "Overriding content model from current edit {prev} to {new}", [
1304                                         'prev' => $this->contentModel,
1305                                         'new' => $rev->getContentModel(),
1306                                         'title' => $this->getTitle()->getPrefixedDBkey(),
1307                                         'method' => __METHOD__
1308                                 ] );
1309                                 $this->contentModel = $rev->getContentModel();
1310                         }
1311
1312                         // Given that the content models should match, the current selected
1313                         // format should be supported.
1314                         if ( !$content->isSupportedFormat( $this->contentFormat ) ) {
1315                                 $logger->warning( "Current revision content format unsupported. Overriding {prev} to {new}", [
1316
1317                                         'prev' => $this->contentFormat,
1318                                         'new' => $rev->getContentFormat(),
1319                                         'title' => $this->getTitle()->getPrefixedDBkey(),
1320                                         'method' => __METHOD__
1321                                 ] );
1322                                 $this->contentFormat = $rev->getContentFormat();
1323                         }
1324                 }
1325                 return $content;
1326         }
1327
1328         /**
1329          * Use this method before edit() to preload some content into the edit box
1330          *
1331          * @param Content $content
1332          *
1333          * @since 1.21
1334          */
1335         public function setPreloadedContent( Content $content ) {
1336                 $this->mPreloadContent = $content;
1337         }
1338
1339         /**
1340          * Get the contents to be preloaded into the box, either set by
1341          * an earlier setPreloadText() or by loading the given page.
1342          *
1343          * @param string $preload Representing the title to preload from.
1344          * @param array $params Parameters to use (interface-message style) in the preloaded text
1345          *
1346          * @return Content
1347          *
1348          * @since 1.21
1349          */
1350         protected function getPreloadedContent( $preload, $params = [] ) {
1351                 global $wgUser;
1352
1353                 if ( !empty( $this->mPreloadContent ) ) {
1354                         return $this->mPreloadContent;
1355                 }
1356
1357                 $handler = ContentHandler::getForModelID( $this->contentModel );
1358
1359                 if ( $preload === '' ) {
1360                         return $handler->makeEmptyContent();
1361                 }
1362
1363                 $title = Title::newFromText( $preload );
1364                 # Check for existence to avoid getting MediaWiki:Noarticletext
1365                 if ( $title === null || !$title->exists() || !$title->userCan( 'read', $wgUser ) ) {
1366                         // TODO: somehow show a warning to the user!
1367                         return $handler->makeEmptyContent();
1368                 }
1369
1370                 $page = WikiPage::factory( $title );
1371                 if ( $page->isRedirect() ) {
1372                         $title = $page->getRedirectTarget();
1373                         # Same as before
1374                         if ( $title === null || !$title->exists() || !$title->userCan( 'read', $wgUser ) ) {
1375                                 // TODO: somehow show a warning to the user!
1376                                 return $handler->makeEmptyContent();
1377                         }
1378                         $page = WikiPage::factory( $title );
1379                 }
1380
1381                 $parserOptions = ParserOptions::newFromUser( $wgUser );
1382                 $content = $page->getContent( Revision::RAW );
1383
1384                 if ( !$content ) {
1385                         // TODO: somehow show a warning to the user!
1386                         return $handler->makeEmptyContent();
1387                 }
1388
1389                 if ( $content->getModel() !== $handler->getModelID() ) {
1390                         $converted = $content->convert( $handler->getModelID() );
1391
1392                         if ( !$converted ) {
1393                                 // TODO: somehow show a warning to the user!
1394                                 wfDebug( "Attempt to preload incompatible content: " .
1395                                         "can't convert " . $content->getModel() .
1396                                         " to " . $handler->getModelID() );
1397
1398                                 return $handler->makeEmptyContent();
1399                         }
1400
1401                         $content = $converted;
1402                 }
1403
1404                 return $content->preloadTransform( $title, $parserOptions, $params );
1405         }
1406
1407         /**
1408          * Make sure the form isn't faking a user's credentials.
1409          *
1410          * @param WebRequest $request
1411          * @return bool
1412          * @private
1413          */
1414         function tokenOk( &$request ) {
1415                 global $wgUser;
1416                 $token = $request->getVal( 'wpEditToken' );
1417                 $this->mTokenOk = $wgUser->matchEditToken( $token );
1418                 $this->mTokenOkExceptSuffix = $wgUser->matchEditTokenNoSuffix( $token );
1419                 return $this->mTokenOk;
1420         }
1421
1422         /**
1423          * Sets post-edit cookie indicating the user just saved a particular revision.
1424          *
1425          * This uses a temporary cookie for each revision ID so separate saves will never
1426          * interfere with each other.
1427          *
1428          * The cookie is deleted in the mediawiki.action.view.postEdit JS module after
1429          * the redirect.  It must be clearable by JavaScript code, so it must not be
1430          * marked HttpOnly. The JavaScript code converts the cookie to a wgPostEdit config
1431          * variable.
1432          *
1433          * If the variable were set on the server, it would be cached, which is unwanted
1434          * since the post-edit state should only apply to the load right after the save.
1435          *
1436          * @param int $statusValue The status value (to check for new article status)
1437          */
1438         protected function setPostEditCookie( $statusValue ) {
1439                 $revisionId = $this->page->getLatest();
1440                 $postEditKey = self::POST_EDIT_COOKIE_KEY_PREFIX . $revisionId;
1441
1442                 $val = 'saved';
1443                 if ( $statusValue == self::AS_SUCCESS_NEW_ARTICLE ) {
1444                         $val = 'created';
1445                 } elseif ( $this->oldid ) {
1446                         $val = 'restored';
1447                 }
1448
1449                 $response = RequestContext::getMain()->getRequest()->response();
1450                 $response->setCookie( $postEditKey, $val, time() + self::POST_EDIT_COOKIE_DURATION, [
1451                         'httpOnly' => false,
1452                 ] );
1453         }
1454
1455         /**
1456          * Attempt submission
1457          * @param array|bool $resultDetails See docs for $result in internalAttemptSave
1458          * @throws UserBlockedError|ReadOnlyError|ThrottledError|PermissionsError
1459          * @return Status The resulting status object.
1460          */
1461         public function attemptSave( &$resultDetails = false ) {
1462                 global $wgUser;
1463
1464                 # Allow bots to exempt some edits from bot flagging
1465                 $bot = $wgUser->isAllowed( 'bot' ) && $this->bot;
1466                 $status = $this->internalAttemptSave( $resultDetails, $bot );
1467
1468                 Hooks::run( 'EditPage::attemptSave:after', [ $this, $status, $resultDetails ] );
1469
1470                 return $status;
1471         }
1472
1473         /**
1474          * Handle status, such as after attempt save
1475          *
1476          * @param Status $status
1477          * @param array|bool $resultDetails
1478          *
1479          * @throws ErrorPageError
1480          * @return bool False, if output is done, true if rest of the form should be displayed
1481          */
1482         private function handleStatus( Status $status, $resultDetails ) {
1483                 global $wgUser, $wgOut;
1484
1485                 /**
1486                  * @todo FIXME: once the interface for internalAttemptSave() is made
1487                  *   nicer, this should use the message in $status
1488                  */
1489                 if ( $status->value == self::AS_SUCCESS_UPDATE
1490                         || $status->value == self::AS_SUCCESS_NEW_ARTICLE
1491                 ) {
1492                         $this->didSave = true;
1493                         if ( !$resultDetails['nullEdit'] ) {
1494                                 $this->setPostEditCookie( $status->value );
1495                         }
1496                 }
1497
1498                 // "wpExtraQueryRedirect" is a hidden input to modify
1499                 // after save URL and is not used by actual edit form
1500                 $request = RequestContext::getMain()->getRequest();
1501                 $extraQueryRedirect = $request->getVal( 'wpExtraQueryRedirect' );
1502
1503                 switch ( $status->value ) {
1504                         case self::AS_HOOK_ERROR_EXPECTED:
1505                         case self::AS_CONTENT_TOO_BIG:
1506                         case self::AS_ARTICLE_WAS_DELETED:
1507                         case self::AS_CONFLICT_DETECTED:
1508                         case self::AS_SUMMARY_NEEDED:
1509                         case self::AS_TEXTBOX_EMPTY:
1510                         case self::AS_MAX_ARTICLE_SIZE_EXCEEDED:
1511                         case self::AS_END:
1512                         case self::AS_BLANK_ARTICLE:
1513                         case self::AS_SELF_REDIRECT:
1514                                 return true;
1515
1516                         case self::AS_HOOK_ERROR:
1517                                 return false;
1518
1519                         case self::AS_CANNOT_USE_CUSTOM_MODEL:
1520                         case self::AS_PARSE_ERROR:
1521                                 $wgOut->addWikiText( '<div class="error">' . "\n" . $status->getWikiText() . '</div>' );
1522                                 return true;
1523
1524                         case self::AS_SUCCESS_NEW_ARTICLE:
1525                                 $query = $resultDetails['redirect'] ? 'redirect=no' : '';
1526                                 if ( $extraQueryRedirect ) {
1527                                         if ( $query === '' ) {
1528                                                 $query = $extraQueryRedirect;
1529                                         } else {
1530                                                 $query = $query . '&' . $extraQueryRedirect;
1531                                         }
1532                                 }
1533                                 $anchor = isset( $resultDetails['sectionanchor'] ) ? $resultDetails['sectionanchor'] : '';
1534                                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $anchor );
1535                                 return false;
1536
1537                         case self::AS_SUCCESS_UPDATE:
1538                                 $extraQuery = '';
1539                                 $sectionanchor = $resultDetails['sectionanchor'];
1540
1541                                 // Give extensions a chance to modify URL query on update
1542                                 Hooks::run(
1543                                         'ArticleUpdateBeforeRedirect',
1544                                         [ $this->mArticle, &$sectionanchor, &$extraQuery ]
1545                                 );
1546
1547                                 if ( $resultDetails['redirect'] ) {
1548                                         if ( $extraQuery == '' ) {
1549                                                 $extraQuery = 'redirect=no';
1550                                         } else {
1551                                                 $extraQuery = 'redirect=no&' . $extraQuery;
1552                                         }
1553                                 }
1554                                 if ( $extraQueryRedirect ) {
1555                                         if ( $extraQuery === '' ) {
1556                                                 $extraQuery = $extraQueryRedirect;
1557                                         } else {
1558                                                 $extraQuery = $extraQuery . '&' . $extraQueryRedirect;
1559                                         }
1560                                 }
1561
1562                                 $wgOut->redirect( $this->mTitle->getFullURL( $extraQuery ) . $sectionanchor );
1563                                 return false;
1564
1565                         case self::AS_SPAM_ERROR:
1566                                 $this->spamPageWithContent( $resultDetails['spam'] );
1567                                 return false;
1568
1569                         case self::AS_BLOCKED_PAGE_FOR_USER:
1570                                 throw new UserBlockedError( $wgUser->getBlock() );
1571
1572                         case self::AS_IMAGE_REDIRECT_ANON:
1573                         case self::AS_IMAGE_REDIRECT_LOGGED:
1574                                 throw new PermissionsError( 'upload' );
1575
1576                         case self::AS_READ_ONLY_PAGE_ANON:
1577                         case self::AS_READ_ONLY_PAGE_LOGGED:
1578                                 throw new PermissionsError( 'edit' );
1579
1580                         case self::AS_READ_ONLY_PAGE:
1581                                 throw new ReadOnlyError;
1582
1583                         case self::AS_RATE_LIMITED:
1584                                 throw new ThrottledError();
1585
1586                         case self::AS_NO_CREATE_PERMISSION:
1587                                 $permission = $this->mTitle->isTalkPage() ? 'createtalk' : 'createpage';
1588                                 throw new PermissionsError( $permission );
1589
1590                         case self::AS_NO_CHANGE_CONTENT_MODEL:
1591                                 throw new PermissionsError( 'editcontentmodel' );
1592
1593                         default:
1594                                 // We don't recognize $status->value. The only way that can happen
1595                                 // is if an extension hook aborted from inside ArticleSave.
1596                                 // Render the status object into $this->hookError
1597                                 // FIXME this sucks, we should just use the Status object throughout
1598                                 $this->hookError = '<div class="error">' ."\n" . $status->getWikiText() .
1599                                         '</div>';
1600                                 return true;
1601                 }
1602         }
1603
1604         /**
1605          * Run hooks that can filter edits just before they get saved.
1606          *
1607          * @param Content $content The Content to filter.
1608          * @param Status $status For reporting the outcome to the caller
1609          * @param User $user The user performing the edit
1610          *
1611          * @return bool
1612          */
1613         protected function runPostMergeFilters( Content $content, Status $status, User $user ) {
1614                 // Run old style post-section-merge edit filter
1615                 if ( !ContentHandler::runLegacyHooks( 'EditFilterMerged',
1616                         [ $this, $content, &$this->hookError, $this->summary ]
1617                 ) ) {
1618                         # Error messages etc. could be handled within the hook...
1619                         $status->fatal( 'hookaborted' );
1620                         $status->value = self::AS_HOOK_ERROR;
1621                         return false;
1622                 } elseif ( $this->hookError != '' ) {
1623                         # ...or the hook could be expecting us to produce an error
1624                         $status->fatal( 'hookaborted' );
1625                         $status->value = self::AS_HOOK_ERROR_EXPECTED;
1626                         return false;
1627                 }
1628
1629                 // Run new style post-section-merge edit filter
1630                 if ( !Hooks::run( 'EditFilterMergedContent',
1631                                 [ $this->mArticle->getContext(), $content, $status, $this->summary,
1632                                 $user, $this->minoredit ] )
1633                 ) {
1634                         # Error messages etc. could be handled within the hook...
1635                         if ( $status->isGood() ) {
1636                                 $status->fatal( 'hookaborted' );
1637                                 // Not setting $this->hookError here is a hack to allow the hook
1638                                 // to cause a return to the edit page without $this->hookError
1639                                 // being set. This is used by ConfirmEdit to display a captcha
1640                                 // without any error message cruft.
1641                         } else {
1642                                 $this->hookError = $this->formatStatusErrors( $status );
1643                         }
1644                         // Use the existing $status->value if the hook set it
1645                         if ( !$status->value ) {
1646                                 $status->value = self::AS_HOOK_ERROR;
1647                         }
1648                         return false;
1649                 } elseif ( !$status->isOK() ) {
1650                         # ...or the hook could be expecting us to produce an error
1651                         // FIXME this sucks, we should just use the Status object throughout
1652                         $this->hookError = $this->formatStatusErrors( $status );
1653                         $status->fatal( 'hookaborted' );
1654                         $status->value = self::AS_HOOK_ERROR_EXPECTED;
1655                         return false;
1656                 }
1657
1658                 return true;
1659         }
1660
1661         /**
1662          * Wrap status errors in an errorbox for increased visiblity
1663          *
1664          * @param Status $status
1665          * @return string
1666          */
1667         private function formatStatusErrors( Status $status ) {
1668                 $errmsg = $status->getHTML(
1669                         'edit-error-short',
1670                         'edit-error-long',
1671                         $this->context->getLanguage()
1672                 );
1673                 return <<<ERROR
1674 <div class="errorbox">
1675 {$errmsg}
1676 </div>
1677 <br clear="all" />
1678 ERROR;
1679         }
1680
1681         /**
1682          * Return the summary to be used for a new section.
1683          *
1684          * @param string $sectionanchor Set to the section anchor text
1685          * @return string
1686          */
1687         private function newSectionSummary( &$sectionanchor = null ) {
1688                 global $wgParser;
1689
1690                 if ( $this->sectiontitle !== '' ) {
1691                         $sectionanchor = $wgParser->guessLegacySectionNameFromWikiText( $this->sectiontitle );
1692                         // If no edit summary was specified, create one automatically from the section
1693                         // title and have it link to the new section. Otherwise, respect the summary as
1694                         // passed.
1695                         if ( $this->summary === '' ) {
1696                                 $cleanSectionTitle = $wgParser->stripSectionName( $this->sectiontitle );
1697                                 return $this->context->msg( 'newsectionsummary' )
1698                                         ->rawParams( $cleanSectionTitle )->inContentLanguage()->text();
1699                         }
1700                 } elseif ( $this->summary !== '' ) {
1701                         $sectionanchor = $wgParser->guessLegacySectionNameFromWikiText( $this->summary );
1702                         # This is a new section, so create a link to the new section
1703                         # in the revision summary.
1704                         $cleanSummary = $wgParser->stripSectionName( $this->summary );
1705                         return $this->context->msg( 'newsectionsummary' )
1706                                 ->rawParams( $cleanSummary )->inContentLanguage()->text();
1707                 }
1708                 return $this->summary;
1709         }
1710
1711         /**
1712          * Attempt submission (no UI)
1713          *
1714          * @param array $result Array to add statuses to, currently with the
1715          *   possible keys:
1716          *   - spam (string): Spam string from content if any spam is detected by
1717          *     matchSpamRegex.
1718          *   - sectionanchor (string): Section anchor for a section save.
1719          *   - nullEdit (boolean): Set if doEditContent is OK.  True if null edit,
1720          *     false otherwise.
1721          *   - redirect (bool): Set if doEditContent is OK. True if resulting
1722          *     revision is a redirect.
1723          * @param bool $bot True if edit is being made under the bot right.
1724          *
1725          * @return Status Status object, possibly with a message, but always with
1726          *   one of the AS_* constants in $status->value,
1727          *
1728          * @todo FIXME: This interface is TERRIBLE, but hard to get rid of due to
1729          *   various error display idiosyncrasies. There are also lots of cases
1730          *   where error metadata is set in the object and retrieved later instead
1731          *   of being returned, e.g. AS_CONTENT_TOO_BIG and
1732          *   AS_BLOCKED_PAGE_FOR_USER. All that stuff needs to be cleaned up some
1733          * time.
1734          */
1735         function internalAttemptSave( &$result, $bot = false ) {
1736                 global $wgUser, $wgRequest, $wgParser, $wgMaxArticleSize;
1737                 global $wgContentHandlerUseDB;
1738
1739                 $status = Status::newGood();
1740
1741                 if ( !Hooks::run( 'EditPage::attemptSave', [ $this ] ) ) {
1742                         wfDebug( "Hook 'EditPage::attemptSave' aborted article saving\n" );
1743                         $status->fatal( 'hookaborted' );
1744                         $status->value = self::AS_HOOK_ERROR;
1745                         return $status;
1746                 }
1747
1748                 $spam = $wgRequest->getText( 'wpAntispam' );
1749                 if ( $spam !== '' ) {
1750                         wfDebugLog(
1751                                 'SimpleAntiSpam',
1752                                 $wgUser->getName() .
1753                                 ' editing "' .
1754                                 $this->mTitle->getPrefixedText() .
1755                                 '" submitted bogus field "' .
1756                                 $spam .
1757                                 '"'
1758                         );
1759                         $status->fatal( 'spamprotectionmatch', false );
1760                         $status->value = self::AS_SPAM_ERROR;
1761                         return $status;
1762                 }
1763
1764                 try {
1765                         # Construct Content object
1766                         $textbox_content = $this->toEditContent( $this->textbox1 );
1767                 } catch ( MWContentSerializationException $ex ) {
1768                         $status->fatal(
1769                                 'content-failed-to-parse',
1770                                 $this->contentModel,
1771                                 $this->contentFormat,
1772                                 $ex->getMessage()
1773                         );
1774                         $status->value = self::AS_PARSE_ERROR;
1775                         return $status;
1776                 }
1777
1778                 # Check image redirect
1779                 if ( $this->mTitle->getNamespace() == NS_FILE &&
1780                         $textbox_content->isRedirect() &&
1781                         !$wgUser->isAllowed( 'upload' )
1782                 ) {
1783                                 $code = $wgUser->isAnon() ? self::AS_IMAGE_REDIRECT_ANON : self::AS_IMAGE_REDIRECT_LOGGED;
1784                                 $status->setResult( false, $code );
1785
1786                                 return $status;
1787                 }
1788
1789                 # Check for spam
1790                 $match = self::matchSummarySpamRegex( $this->summary );
1791                 if ( $match === false && $this->section == 'new' ) {
1792                         # $wgSpamRegex is enforced on this new heading/summary because, unlike
1793                         # regular summaries, it is added to the actual wikitext.
1794                         if ( $this->sectiontitle !== '' ) {
1795                                 # This branch is taken when the API is used with the 'sectiontitle' parameter.
1796                                 $match = self::matchSpamRegex( $this->sectiontitle );
1797                         } else {
1798                                 # This branch is taken when the "Add Topic" user interface is used, or the API
1799                                 # is used with the 'summary' parameter.
1800                                 $match = self::matchSpamRegex( $this->summary );
1801                         }
1802                 }
1803                 if ( $match === false ) {
1804                         $match = self::matchSpamRegex( $this->textbox1 );
1805                 }
1806                 if ( $match !== false ) {
1807                         $result['spam'] = $match;
1808                         $ip = $wgRequest->getIP();
1809                         $pdbk = $this->mTitle->getPrefixedDBkey();
1810                         $match = str_replace( "\n", '', $match );
1811                         wfDebugLog( 'SpamRegex', "$ip spam regex hit [[$pdbk]]: \"$match\"" );
1812                         $status->fatal( 'spamprotectionmatch', $match );
1813                         $status->value = self::AS_SPAM_ERROR;
1814                         return $status;
1815                 }
1816                 if ( !Hooks::run(
1817                         'EditFilter',
1818                         [ $this, $this->textbox1, $this->section, &$this->hookError, $this->summary ] )
1819                 ) {
1820                         # Error messages etc. could be handled within the hook...
1821                         $status->fatal( 'hookaborted' );
1822                         $status->value = self::AS_HOOK_ERROR;
1823                         return $status;
1824                 } elseif ( $this->hookError != '' ) {
1825                         # ...or the hook could be expecting us to produce an error
1826                         $status->fatal( 'hookaborted' );
1827                         $status->value = self::AS_HOOK_ERROR_EXPECTED;
1828                         return $status;
1829                 }
1830
1831                 if ( $wgUser->isBlockedFrom( $this->mTitle, false ) ) {
1832                         // Auto-block user's IP if the account was "hard" blocked
1833                         if ( !wfReadOnly() ) {
1834                                 $wgUser->spreadAnyEditBlock();
1835                         }
1836                         # Check block state against master, thus 'false'.
1837                         $status->setResult( false, self::AS_BLOCKED_PAGE_FOR_USER );
1838                         return $status;
1839                 }
1840
1841                 $this->contentLength = strlen( $this->textbox1 );
1842                 if ( $this->contentLength > $wgMaxArticleSize * 1024 ) {
1843                         // Error will be displayed by showEditForm()
1844                         $this->tooBig = true;
1845                         $status->setResult( false, self::AS_CONTENT_TOO_BIG );
1846                         return $status;
1847                 }
1848
1849                 if ( !$wgUser->isAllowed( 'edit' ) ) {
1850                         if ( $wgUser->isAnon() ) {
1851                                 $status->setResult( false, self::AS_READ_ONLY_PAGE_ANON );
1852                                 return $status;
1853                         } else {
1854                                 $status->fatal( 'readonlytext' );
1855                                 $status->value = self::AS_READ_ONLY_PAGE_LOGGED;
1856                                 return $status;
1857                         }
1858                 }
1859
1860                 $changingContentModel = false;
1861                 if ( $this->contentModel !== $this->mTitle->getContentModel() ) {
1862                         if ( !$wgContentHandlerUseDB ) {
1863                                 $status->fatal( 'editpage-cannot-use-custom-model' );
1864                                 $status->value = self::AS_CANNOT_USE_CUSTOM_MODEL;
1865                                 return $status;
1866                         } elseif ( !$wgUser->isAllowed( 'editcontentmodel' ) ) {
1867                                 $status->setResult( false, self::AS_NO_CHANGE_CONTENT_MODEL );
1868                                 return $status;
1869                         }
1870                         // Make sure the user can edit the page under the new content model too
1871                         $titleWithNewContentModel = clone $this->mTitle;
1872                         $titleWithNewContentModel->setContentModel( $this->contentModel );
1873                         if ( !$titleWithNewContentModel->userCan( 'editcontentmodel', $wgUser )
1874                                 || !$titleWithNewContentModel->userCan( 'edit', $wgUser )
1875                         ) {
1876                                 $status->setResult( false, self::AS_NO_CHANGE_CONTENT_MODEL );
1877                                 return $status;
1878                         }
1879
1880                         $changingContentModel = true;
1881                         $oldContentModel = $this->mTitle->getContentModel();
1882                 }
1883
1884                 if ( $this->changeTags ) {
1885                         $changeTagsStatus = ChangeTags::canAddTagsAccompanyingChange(
1886                                 $this->changeTags, $wgUser );
1887                         if ( !$changeTagsStatus->isOK() ) {
1888                                 $changeTagsStatus->value = self::AS_CHANGE_TAG_ERROR;
1889                                 return $changeTagsStatus;
1890                         }
1891                 }
1892
1893                 if ( wfReadOnly() ) {
1894                         $status->fatal( 'readonlytext' );
1895                         $status->value = self::AS_READ_ONLY_PAGE;
1896                         return $status;
1897                 }
1898                 if ( $wgUser->pingLimiter() || $wgUser->pingLimiter( 'linkpurge', 0 )
1899                         || ( $changingContentModel && $wgUser->pingLimiter( 'editcontentmodel' ) )
1900                 ) {
1901                         $status->fatal( 'actionthrottledtext' );
1902                         $status->value = self::AS_RATE_LIMITED;
1903                         return $status;
1904                 }
1905
1906                 # If the article has been deleted while editing, don't save it without
1907                 # confirmation
1908                 if ( $this->wasDeletedSinceLastEdit() && !$this->recreate ) {
1909                         $status->setResult( false, self::AS_ARTICLE_WAS_DELETED );
1910                         return $status;
1911                 }
1912
1913                 # Load the page data from the master. If anything changes in the meantime,
1914                 # we detect it by using page_latest like a token in a 1 try compare-and-swap.
1915                 $this->page->loadPageData( 'fromdbmaster' );
1916                 $new = !$this->page->exists();
1917
1918                 if ( $new ) {
1919                         // Late check for create permission, just in case *PARANOIA*
1920                         if ( !$this->mTitle->userCan( 'create', $wgUser ) ) {
1921                                 $status->fatal( 'nocreatetext' );
1922                                 $status->value = self::AS_NO_CREATE_PERMISSION;
1923                                 wfDebug( __METHOD__ . ": no create permission\n" );
1924                                 return $status;
1925                         }
1926
1927                         // Don't save a new page if it's blank or if it's a MediaWiki:
1928                         // message with content equivalent to default (allow empty pages
1929                         // in this case to disable messages, see bug 50124)
1930                         $defaultMessageText = $this->mTitle->getDefaultMessageText();
1931                         if ( $this->mTitle->getNamespace() === NS_MEDIAWIKI && $defaultMessageText !== false ) {
1932                                 $defaultText = $defaultMessageText;
1933                         } else {
1934                                 $defaultText = '';
1935                         }
1936
1937                         if ( !$this->allowBlankArticle && $this->textbox1 === $defaultText ) {
1938                                 $this->blankArticle = true;
1939                                 $status->fatal( 'blankarticle' );
1940                                 $status->setResult( false, self::AS_BLANK_ARTICLE );
1941                                 return $status;
1942                         }
1943
1944                         if ( !$this->runPostMergeFilters( $textbox_content, $status, $wgUser ) ) {
1945                                 return $status;
1946                         }
1947
1948                         $content = $textbox_content;
1949
1950                         $result['sectionanchor'] = '';
1951                         if ( $this->section == 'new' ) {
1952                                 if ( $this->sectiontitle !== '' ) {
1953                                         // Insert the section title above the content.
1954                                         $content = $content->addSectionHeader( $this->sectiontitle );
1955                                 } elseif ( $this->summary !== '' ) {
1956                                         // Insert the section title above the content.
1957                                         $content = $content->addSectionHeader( $this->summary );
1958                                 }
1959                                 $this->summary = $this->newSectionSummary( $result['sectionanchor'] );
1960                         }
1961
1962                         $status->value = self::AS_SUCCESS_NEW_ARTICLE;
1963
1964                 } else { # not $new
1965
1966                         # Article exists. Check for edit conflict.
1967
1968                         $this->page->clear(); # Force reload of dates, etc.
1969                         $timestamp = $this->page->getTimestamp();
1970                         $latest = $this->page->getLatest();
1971
1972                         wfDebug( "timestamp: {$timestamp}, edittime: {$this->edittime}\n" );
1973
1974                         // Check editRevId if set, which handles same-second timestamp collisions
1975                         if ( $timestamp != $this->edittime
1976                                 || ( $this->editRevId !== null && $this->editRevId != $latest )
1977                         ) {
1978                                 $this->isConflict = true;
1979                                 if ( $this->section == 'new' ) {
1980                                         if ( $this->page->getUserText() == $wgUser->getName() &&
1981                                                 $this->page->getComment() == $this->newSectionSummary()
1982                                         ) {
1983                                                 // Probably a duplicate submission of a new comment.
1984                                                 // This can happen when CDN resends a request after
1985                                                 // a timeout but the first one actually went through.
1986                                                 wfDebug( __METHOD__
1987                                                         . ": duplicate new section submission; trigger edit conflict!\n" );
1988                                         } else {
1989                                                 // New comment; suppress conflict.
1990                                                 $this->isConflict = false;
1991                                                 wfDebug( __METHOD__ . ": conflict suppressed; new section\n" );
1992                                         }
1993                                 } elseif ( $this->section == ''
1994                                         && Revision::userWasLastToEdit(
1995                                                 DB_MASTER, $this->mTitle->getArticleID(),
1996                                                 $wgUser->getId(), $this->edittime
1997                                         )
1998                                 ) {
1999                                         # Suppress edit conflict with self, except for section edits where merging is required.
2000                                         wfDebug( __METHOD__ . ": Suppressing edit conflict, same user.\n" );
2001                                         $this->isConflict = false;
2002                                 }
2003                         }
2004
2005                         // If sectiontitle is set, use it, otherwise use the summary as the section title.
2006                         if ( $this->sectiontitle !== '' ) {
2007                                 $sectionTitle = $this->sectiontitle;
2008                         } else {
2009                                 $sectionTitle = $this->summary;
2010                         }
2011
2012                         $content = null;
2013
2014                         if ( $this->isConflict ) {
2015                                 wfDebug( __METHOD__
2016                                         . ": conflict! getting section '{$this->section}' for time '{$this->edittime}'"
2017                                         . " (id '{$this->editRevId}') (article time '{$timestamp}')\n" );
2018                                 // @TODO: replaceSectionAtRev() with base ID (not prior current) for ?oldid=X case
2019                                 // ...or disable section editing for non-current revisions (not exposed anyway).
2020                                 if ( $this->editRevId !== null ) {
2021                                         $content = $this->page->replaceSectionAtRev(
2022                                                 $this->section,
2023                                                 $textbox_content,
2024                                                 $sectionTitle,
2025                                                 $this->editRevId
2026                                         );
2027                                 } else {
2028                                         $content = $this->page->replaceSectionContent(
2029                                                 $this->section,
2030                                                 $textbox_content,
2031                                                 $sectionTitle,
2032                                                 $this->edittime
2033                                         );
2034                                 }
2035                         } else {
2036                                 wfDebug( __METHOD__ . ": getting section '{$this->section}'\n" );
2037                                 $content = $this->page->replaceSectionContent(
2038                                         $this->section,
2039                                         $textbox_content,
2040                                         $sectionTitle
2041                                 );
2042                         }
2043
2044                         if ( is_null( $content ) ) {
2045                                 wfDebug( __METHOD__ . ": activating conflict; section replace failed.\n" );
2046                                 $this->isConflict = true;
2047                                 $content = $textbox_content; // do not try to merge here!
2048                         } elseif ( $this->isConflict ) {
2049                                 # Attempt merge
2050                                 if ( $this->mergeChangesIntoContent( $content ) ) {
2051                                         // Successful merge! Maybe we should tell the user the good news?
2052                                         $this->isConflict = false;
2053                                         wfDebug( __METHOD__ . ": Suppressing edit conflict, successful merge.\n" );
2054                                 } else {
2055                                         $this->section = '';
2056                                         $this->textbox1 = ContentHandler::getContentText( $content );
2057                                         wfDebug( __METHOD__ . ": Keeping edit conflict, failed merge.\n" );
2058                                 }
2059                         }
2060
2061                         if ( $this->isConflict ) {
2062                                 $status->setResult( false, self::AS_CONFLICT_DETECTED );
2063                                 return $status;
2064                         }
2065
2066                         if ( !$this->runPostMergeFilters( $content, $status, $wgUser ) ) {
2067                                 return $status;
2068                         }
2069
2070                         if ( $this->section == 'new' ) {
2071                                 // Handle the user preference to force summaries here
2072                                 if ( !$this->allowBlankSummary && trim( $this->summary ) == '' ) {
2073                                         $this->missingSummary = true;
2074                                         $status->fatal( 'missingsummary' ); // or 'missingcommentheader' if $section == 'new'. Blegh
2075                                         $status->value = self::AS_SUMMARY_NEEDED;
2076                                         return $status;
2077                                 }
2078
2079                                 // Do not allow the user to post an empty comment
2080                                 if ( $this->textbox1 == '' ) {
2081                                         $this->missingComment = true;
2082                                         $status->fatal( 'missingcommenttext' );
2083                                         $status->value = self::AS_TEXTBOX_EMPTY;
2084                                         return $status;
2085                                 }
2086                         } elseif ( !$this->allowBlankSummary
2087                                 && !$content->equals( $this->getOriginalContent( $wgUser ) )
2088                                 && !$content->isRedirect()
2089                                 && md5( $this->summary ) == $this->autoSumm
2090                         ) {
2091                                 $this->missingSummary = true;
2092                                 $status->fatal( 'missingsummary' );
2093                                 $status->value = self::AS_SUMMARY_NEEDED;
2094                                 return $status;
2095                         }
2096
2097                         # All's well
2098                         $sectionanchor = '';
2099                         if ( $this->section == 'new' ) {
2100                                 $this->summary = $this->newSectionSummary( $sectionanchor );
2101                         } elseif ( $this->section != '' ) {
2102                                 # Try to get a section anchor from the section source, redirect
2103                                 # to edited section if header found.
2104                                 # XXX: Might be better to integrate this into Article::replaceSectionAtRev
2105                                 # for duplicate heading checking and maybe parsing.
2106                                 $hasmatch = preg_match( "/^ *([=]{1,6})(.*?)(\\1) *\\n/i", $this->textbox1, $matches );
2107                                 # We can't deal with anchors, includes, html etc in the header for now,
2108                                 # headline would need to be parsed to improve this.
2109                                 if ( $hasmatch && strlen( $matches[2] ) > 0 ) {
2110                                         $sectionanchor = $wgParser->guessLegacySectionNameFromWikiText( $matches[2] );
2111                                 }
2112                         }
2113                         $result['sectionanchor'] = $sectionanchor;
2114
2115                         // Save errors may fall down to the edit form, but we've now
2116                         // merged the section into full text. Clear the section field
2117                         // so that later submission of conflict forms won't try to
2118                         // replace that into a duplicated mess.
2119                         $this->textbox1 = $this->toEditText( $content );
2120                         $this->section = '';
2121
2122                         $status->value = self::AS_SUCCESS_UPDATE;
2123                 }
2124
2125                 if ( !$this->allowSelfRedirect
2126                         && $content->isRedirect()
2127                         && $content->getRedirectTarget()->equals( $this->getTitle() )
2128                 ) {
2129                         // If the page already redirects to itself, don't warn.
2130                         $currentTarget = $this->getCurrentContent()->getRedirectTarget();
2131                         if ( !$currentTarget || !$currentTarget->equals( $this->getTitle() ) ) {
2132                                 $this->selfRedirect = true;
2133                                 $status->fatal( 'selfredirect' );
2134                                 $status->value = self::AS_SELF_REDIRECT;
2135                                 return $status;
2136                         }
2137                 }
2138
2139                 // Check for length errors again now that the section is merged in
2140                 $this->contentLength = strlen( $this->toEditText( $content ) );
2141                 if ( $this->contentLength > $wgMaxArticleSize * 1024 ) {
2142                         $this->tooBig = true;
2143                         $status->setResult( false, self::AS_MAX_ARTICLE_SIZE_EXCEEDED );
2144                         return $status;
2145                 }
2146
2147                 $flags = EDIT_AUTOSUMMARY |
2148                         ( $new ? EDIT_NEW : EDIT_UPDATE ) |
2149                         ( ( $this->minoredit && !$this->isNew ) ? EDIT_MINOR : 0 ) |
2150                         ( $bot ? EDIT_FORCE_BOT : 0 );
2151
2152                 $doEditStatus = $this->page->doEditContent(
2153                         $content,
2154                         $this->summary,
2155                         $flags,
2156                         false,
2157                         $wgUser,
2158                         $content->getDefaultFormat(),
2159                         $this->changeTags
2160                 );
2161
2162                 if ( !$doEditStatus->isOK() ) {
2163                         // Failure from doEdit()
2164                         // Show the edit conflict page for certain recognized errors from doEdit(),
2165                         // but don't show it for errors from extension hooks
2166                         $errors = $doEditStatus->getErrorsArray();
2167                         if ( in_array( $errors[0][0],
2168                                         [ 'edit-gone-missing', 'edit-conflict', 'edit-already-exists' ] )
2169                         ) {
2170                                 $this->isConflict = true;
2171                                 // Destroys data doEdit() put in $status->value but who cares
2172                                 $doEditStatus->value = self::AS_END;
2173                         }
2174                         return $doEditStatus;
2175                 }
2176
2177                 $result['nullEdit'] = $doEditStatus->hasMessage( 'edit-no-change' );
2178                 if ( $result['nullEdit'] ) {
2179                         // We don't know if it was a null edit until now, so increment here
2180                         $wgUser->pingLimiter( 'linkpurge' );
2181                 }
2182                 $result['redirect'] = $content->isRedirect();
2183
2184                 $this->updateWatchlist();
2185
2186                 // If the content model changed, add a log entry
2187                 if ( $changingContentModel ) {
2188                         $this->addContentModelChangeLogEntry(
2189                                 $wgUser,
2190                                 $new ? false : $oldContentModel,
2191                                 $this->contentModel,
2192                                 $this->summary
2193                         );
2194                 }
2195
2196                 return $status;
2197         }
2198
2199         /**
2200          * @param User $user
2201          * @param string|false $oldModel false if the page is being newly created
2202          * @param string $newModel
2203          * @param string $reason
2204          */
2205         protected function addContentModelChangeLogEntry( User $user, $oldModel, $newModel, $reason ) {
2206                 $new = $oldModel === false;
2207                 $log = new ManualLogEntry( 'contentmodel', $new ? 'new' : 'change' );
2208                 $log->setPerformer( $user );
2209                 $log->setTarget( $this->mTitle );
2210                 $log->setComment( $reason );
2211                 $log->setParameters( [
2212                         '4::oldmodel' => $oldModel,
2213                         '5::newmodel' => $newModel
2214                 ] );
2215                 $logid = $log->insert();
2216                 $log->publish( $logid );
2217         }
2218
2219         /**
2220          * Register the change of watch status
2221          */
2222         protected function updateWatchlist() {
2223                 global $wgUser;
2224
2225                 if ( !$wgUser->isLoggedIn() ) {
2226                         return;
2227                 }
2228
2229                 $user = $wgUser;
2230                 $title = $this->mTitle;
2231                 $watch = $this->watchthis;
2232                 // Do this in its own transaction to reduce contention...
2233                 DeferredUpdates::addCallableUpdate( function () use ( $user, $title, $watch ) {
2234                         if ( $watch == $user->isWatched( $title, User::IGNORE_USER_RIGHTS ) ) {
2235                                 return; // nothing to change
2236                         }
2237                         WatchAction::doWatchOrUnwatch( $watch, $title, $user );
2238                 } );
2239         }
2240
2241         /**
2242          * Attempts to do 3-way merge of edit content with a base revision
2243          * and current content, in case of edit conflict, in whichever way appropriate
2244          * for the content type.
2245          *
2246          * @since 1.21
2247          *
2248          * @param Content $editContent
2249          *
2250          * @return bool
2251          */
2252         private function mergeChangesIntoContent( &$editContent ) {
2253
2254                 $db = wfGetDB( DB_MASTER );
2255
2256                 // This is the revision the editor started from
2257                 $baseRevision = $this->getBaseRevision();
2258                 $baseContent = $baseRevision ? $baseRevision->getContent() : null;
2259
2260                 if ( is_null( $baseContent ) ) {
2261                         return false;
2262                 }
2263
2264                 // The current state, we want to merge updates into it
2265                 $currentRevision = Revision::loadFromTitle( $db, $this->mTitle );
2266                 $currentContent = $currentRevision ? $currentRevision->getContent() : null;
2267
2268                 if ( is_null( $currentContent ) ) {
2269                         return false;
2270                 }
2271
2272                 $handler = ContentHandler::getForModelID( $baseContent->getModel() );
2273
2274                 $result = $handler->merge3( $baseContent, $editContent, $currentContent );
2275
2276                 if ( $result ) {
2277                         $editContent = $result;
2278                         // Update parentRevId to what we just merged.
2279                         $this->parentRevId = $currentRevision->getId();
2280                         return true;
2281                 }
2282
2283                 return false;
2284         }
2285
2286         /**
2287          * @note: this method is very poorly named. If the user opened the form with ?oldid=X,
2288          *        one might think of X as the "base revision", which is NOT what this returns.
2289          * @return Revision Current version when the edit was started
2290          */
2291         function getBaseRevision() {
2292                 if ( !$this->mBaseRevision ) {
2293                         $db = wfGetDB( DB_MASTER );
2294                         $this->mBaseRevision = $this->editRevId
2295                                 ? Revision::newFromId( $this->editRevId, Revision::READ_LATEST )
2296                                 : Revision::loadFromTimestamp( $db, $this->mTitle, $this->edittime );
2297                 }
2298                 return $this->mBaseRevision;
2299         }
2300
2301         /**
2302          * Check given input text against $wgSpamRegex, and return the text of the first match.
2303          *
2304          * @param string $text
2305          *
2306          * @return string|bool Matching string or false
2307          */
2308         public static function matchSpamRegex( $text ) {
2309                 global $wgSpamRegex;
2310                 // For back compatibility, $wgSpamRegex may be a single string or an array of regexes.
2311                 $regexes = (array)$wgSpamRegex;
2312                 return self::matchSpamRegexInternal( $text, $regexes );
2313         }
2314
2315         /**
2316          * Check given input text against $wgSummarySpamRegex, and return the text of the first match.
2317          *
2318          * @param string $text
2319          *
2320          * @return string|bool Matching string or false
2321          */
2322         public static function matchSummarySpamRegex( $text ) {
2323                 global $wgSummarySpamRegex;
2324                 $regexes = (array)$wgSummarySpamRegex;
2325                 return self::matchSpamRegexInternal( $text, $regexes );
2326         }
2327
2328         /**
2329          * @param string $text
2330          * @param array $regexes
2331          * @return bool|string
2332          */
2333         protected static function matchSpamRegexInternal( $text, $regexes ) {
2334                 foreach ( $regexes as $regex ) {
2335                         $matches = [];
2336                         if ( preg_match( $regex, $text, $matches ) ) {
2337                                 return $matches[0];
2338                         }
2339                 }
2340                 return false;
2341         }
2342
2343         function setHeaders() {
2344                 global $wgOut, $wgUser, $wgAjaxEditStash;
2345
2346                 $wgOut->addModules( 'mediawiki.action.edit' );
2347                 $wgOut->addModuleStyles( 'mediawiki.action.edit.styles' );
2348
2349                 if ( $wgUser->getOption( 'showtoolbar' ) ) {
2350                         // The addition of default buttons is handled by getEditToolbar() which
2351                         // has its own dependency on this module. The call here ensures the module
2352                         // is loaded in time (it has position "top") for other modules to register
2353                         // buttons (e.g. extensions, gadgets, user scripts).
2354                         $wgOut->addModules( 'mediawiki.toolbar' );
2355                 }
2356
2357                 if ( $wgUser->getOption( 'uselivepreview' ) ) {
2358                         $wgOut->addModules( 'mediawiki.action.edit.preview' );
2359                 }
2360
2361                 if ( $wgUser->getOption( 'useeditwarning' ) ) {
2362                         $wgOut->addModules( 'mediawiki.action.edit.editWarning' );
2363                 }
2364
2365                 # Enabled article-related sidebar, toplinks, etc.
2366                 $wgOut->setArticleRelated( true );
2367
2368                 $contextTitle = $this->getContextTitle();
2369                 if ( $this->isConflict ) {
2370                         $msg = 'editconflict';
2371                 } elseif ( $contextTitle->exists() && $this->section != '' ) {
2372                         $msg = $this->section == 'new' ? 'editingcomment' : 'editingsection';
2373                 } else {
2374                         $msg = $contextTitle->exists()
2375                                 || ( $contextTitle->getNamespace() == NS_MEDIAWIKI
2376                                         && $contextTitle->getDefaultMessageText() !== false
2377                                 )
2378                                 ? 'editing'
2379                                 : 'creating';
2380                 }
2381
2382                 # Use the title defined by DISPLAYTITLE magic word when present
2383                 # NOTE: getDisplayTitle() returns HTML while getPrefixedText() returns plain text.
2384                 #       setPageTitle() treats the input as wikitext, which should be safe in either case.
2385                 $displayTitle = isset( $this->mParserOutput ) ? $this->mParserOutput->getDisplayTitle() : false;
2386                 if ( $displayTitle === false ) {
2387                         $displayTitle = $contextTitle->getPrefixedText();
2388                 }
2389                 $wgOut->setPageTitle( $this->context->msg( $msg, $displayTitle ) );
2390                 # Transmit the name of the message to JavaScript for live preview
2391                 # Keep Resources.php/mediawiki.action.edit.preview in sync with the possible keys
2392                 $wgOut->addJsConfigVars( [
2393                         'wgEditMessage' => $msg,
2394                         'wgAjaxEditStash' => $wgAjaxEditStash,
2395                 ] );
2396         }
2397
2398         /**
2399          * Show all applicable editing introductions
2400          */
2401         protected function showIntro() {
2402                 global $wgOut, $wgUser;
2403                 if ( $this->suppressIntro ) {
2404                         return;
2405                 }
2406
2407                 $namespace = $this->mTitle->getNamespace();
2408
2409                 if ( $namespace == NS_MEDIAWIKI ) {
2410                         # Show a warning if editing an interface message
2411                         $wgOut->wrapWikiMsg( "<div class='mw-editinginterface'>\n$1\n</div>", 'editinginterface' );
2412                         # If this is a default message (but not css or js),
2413                         # show a hint that it is translatable on translatewiki.net
2414                         if ( !$this->mTitle->hasContentModel( CONTENT_MODEL_CSS )
2415                                 && !$this->mTitle->hasContentModel( CONTENT_MODEL_JAVASCRIPT )
2416                         ) {
2417                                 $defaultMessageText = $this->mTitle->getDefaultMessageText();
2418                                 if ( $defaultMessageText !== false ) {
2419                                         $wgOut->wrapWikiMsg( "<div class='mw-translateinterface'>\n$1\n</div>",
2420                                                 'translateinterface' );
2421                                 }
2422                         }
2423                 } elseif ( $namespace == NS_FILE ) {
2424                         # Show a hint to shared repo
2425                         $file = wfFindFile( $this->mTitle );
2426                         if ( $file && !$file->isLocal() ) {
2427                                 $descUrl = $file->getDescriptionUrl();
2428                                 # there must be a description url to show a hint to shared repo
2429                                 if ( $descUrl ) {
2430                                         if ( !$this->mTitle->exists() ) {
2431                                                 $wgOut->wrapWikiMsg( "<div class=\"mw-sharedupload-desc-create\">\n$1\n</div>", [
2432                                                                         'sharedupload-desc-create', $file->getRepo()->getDisplayName(), $descUrl
2433                                                 ] );
2434                                         } else {
2435                                                 $wgOut->wrapWikiMsg( "<div class=\"mw-sharedupload-desc-edit\">\n$1\n</div>", [
2436                                                                         'sharedupload-desc-edit', $file->getRepo()->getDisplayName(), $descUrl
2437                                                 ] );
2438                                         }
2439                                 }
2440                         }
2441                 }
2442
2443                 # Show a warning message when someone creates/edits a user (talk) page but the user does not exist
2444                 # Show log extract when the user is currently blocked
2445                 if ( $namespace == NS_USER || $namespace == NS_USER_TALK ) {
2446                         $username = explode( '/', $this->mTitle->getText(), 2 )[0];
2447                         $user = User::newFromName( $username, false /* allow IP users*/ );
2448                         $ip = User::isIP( $username );
2449                         $block = Block::newFromTarget( $user, $user );
2450                         if ( !( $user && $user->isLoggedIn() ) && !$ip ) { # User does not exist
2451                                 $wgOut->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n$1\n</div>",
2452                                         [ 'userpage-userdoesnotexist', wfEscapeWikiText( $username ) ] );
2453                         } elseif ( !is_null( $block ) && $block->getType() != Block::TYPE_AUTO ) {
2454                                 # Show log extract if the user is currently blocked
2455                                 LogEventsList::showLogExtract(
2456                                         $wgOut,
2457                                         'block',
2458                                         MWNamespace::getCanonicalName( NS_USER ) . ':' . $block->getTarget(),
2459                                         '',
2460                                         [
2461                                                 'lim' => 1,
2462                                                 'showIfEmpty' => false,
2463                                                 'msgKey' => [
2464                                                         'blocked-notice-logextract',
2465                                                         $user->getName() # Support GENDER in notice
2466                                                 ]
2467                                         ]
2468                                 );
2469                         }
2470                 }
2471                 # Try to add a custom edit intro, or use the standard one if this is not possible.
2472                 if ( !$this->showCustomIntro() && !$this->mTitle->exists() ) {
2473                         $helpLink = wfExpandUrl( Skin::makeInternalOrExternalUrl(
2474                                 $this->context->msg( 'helppage' )->inContentLanguage()->text()
2475                         ) );
2476                         if ( $wgUser->isLoggedIn() ) {
2477                                 $wgOut->wrapWikiMsg(
2478                                         // Suppress the external link icon, consider the help url an internal one
2479                                         "<div class=\"mw-newarticletext plainlinks\">\n$1\n</div>",
2480                                         [
2481                                                 'newarticletext',
2482                                                 $helpLink
2483                                         ]
2484                                 );
2485                         } else {
2486                                 $wgOut->wrapWikiMsg(
2487                                         // Suppress the external link icon, consider the help url an internal one
2488                                         "<div class=\"mw-newarticletextanon plainlinks\">\n$1\n</div>",
2489                                         [
2490                                                 'newarticletextanon',
2491                                                 $helpLink
2492                                         ]
2493                                 );
2494                         }
2495                 }
2496                 # Give a notice if the user is editing a deleted/moved page...
2497                 if ( !$this->mTitle->exists() ) {
2498                         LogEventsList::showLogExtract( $wgOut, [ 'delete', 'move' ], $this->mTitle,
2499                                 '',
2500                                 [
2501                                         'lim' => 10,
2502                                         'conds' => [ "log_action != 'revision'" ],
2503                                         'showIfEmpty' => false,
2504                                         'msgKey' => [ 'recreate-moveddeleted-warn' ]
2505                                 ]
2506                         );
2507                 }
2508         }
2509
2510         /**
2511          * Attempt to show a custom editing introduction, if supplied
2512          *
2513          * @return bool
2514          */
2515         protected function showCustomIntro() {
2516                 if ( $this->editintro ) {
2517                         $title = Title::newFromText( $this->editintro );
2518                         if ( $title instanceof Title && $title->exists() && $title->userCan( 'read' ) ) {
2519                                 global $wgOut;
2520                                 // Added using template syntax, to take <noinclude>'s into account.
2521                                 $wgOut->addWikiTextTitleTidy(
2522                                         '<div class="mw-editintro">{{:' . $title->getFullText() . '}}</div>',
2523                                         $this->mTitle
2524                                 );
2525                                 return true;
2526                         }
2527                 }
2528                 return false;
2529         }
2530
2531         /**
2532          * Gets an editable textual representation of $content.
2533          * The textual representation can be turned by into a Content object by the
2534          * toEditContent() method.
2535          *
2536          * If $content is null or false or a string, $content is returned unchanged.
2537          *
2538          * If the given Content object is not of a type that can be edited using
2539          * the text base EditPage, an exception will be raised. Set
2540          * $this->allowNonTextContent to true to allow editing of non-textual
2541          * content.
2542          *
2543          * @param Content|null|bool|string $content
2544          * @return string The editable text form of the content.
2545          *
2546          * @throws MWException If $content is not an instance of TextContent and
2547          *   $this->allowNonTextContent is not true.
2548          */
2549         protected function toEditText( $content ) {
2550                 if ( $content === null || $content === false || is_string( $content ) ) {
2551                         return $content;
2552                 }
2553
2554                 if ( !$this->isSupportedContentModel( $content->getModel() ) ) {
2555                         throw new MWException( 'This content model is not supported: ' . $content->getModel() );
2556                 }
2557
2558                 return $content->serialize( $this->contentFormat );
2559         }
2560
2561         /**
2562          * Turns the given text into a Content object by unserializing it.
2563          *
2564          * If the resulting Content object is not of a type that can be edited using
2565          * the text base EditPage, an exception will be raised. Set
2566          * $this->allowNonTextContent to true to allow editing of non-textual
2567          * content.
2568          *
2569          * @param string|null|bool $text Text to unserialize
2570          * @return Content|bool|null The content object created from $text. If $text was false
2571          *   or null, false resp. null will be  returned instead.
2572          *
2573          * @throws MWException If unserializing the text results in a Content
2574          *   object that is not an instance of TextContent and
2575          *   $this->allowNonTextContent is not true.
2576          */
2577         protected function toEditContent( $text ) {
2578                 if ( $text === false || $text === null ) {
2579                         return $text;
2580                 }
2581
2582                 $content = ContentHandler::makeContent( $text, $this->getTitle(),
2583                         $this->contentModel, $this->contentFormat );
2584
2585                 if ( !$this->isSupportedContentModel( $content->getModel() ) ) {
2586                         throw new MWException( 'This content model is not supported: ' . $content->getModel() );
2587                 }
2588
2589                 return $content;
2590         }
2591
2592         /**
2593          * Send the edit form and related headers to $wgOut
2594          * @param callable|null $formCallback That takes an OutputPage parameter; will be called
2595          *     during form output near the top, for captchas and the like.
2596          *
2597          * The $formCallback parameter is deprecated since MediaWiki 1.25. Please
2598          * use the EditPage::showEditForm:fields hook instead.
2599          */
2600         function showEditForm( $formCallback = null ) {
2601                 global $wgOut, $wgUser;
2602
2603                 # need to parse the preview early so that we know which templates are used,
2604                 # otherwise users with "show preview after edit box" will get a blank list
2605                 # we parse this near the beginning so that setHeaders can do the title
2606                 # setting work instead of leaving it in getPreviewText
2607                 $previewOutput = '';
2608                 if ( $this->formtype == 'preview' ) {
2609                         $previewOutput = $this->getPreviewText();
2610                 }
2611
2612                 Hooks::run( 'EditPage::showEditForm:initial', [ &$this, &$wgOut ] );
2613
2614                 $this->setHeaders();
2615
2616                 if ( $this->showHeader() === false ) {
2617                         return;
2618                 }
2619
2620                 $wgOut->addHTML( $this->editFormPageTop );
2621
2622                 if ( $wgUser->getOption( 'previewontop' ) ) {
2623                         $this->displayPreviewArea( $previewOutput, true );
2624                 }
2625
2626                 $wgOut->addHTML( $this->editFormTextTop );
2627
2628                 $showToolbar = true;
2629                 if ( $this->wasDeletedSinceLastEdit() ) {
2630                         if ( $this->formtype == 'save' ) {
2631                                 // Hide the toolbar and edit area, user can click preview to get it back
2632                                 // Add an confirmation checkbox and explanation.
2633                                 $showToolbar = false;
2634                         } else {
2635                                 $wgOut->wrapWikiMsg( "<div class='error mw-deleted-while-editing'>\n$1\n</div>",
2636                                         'deletedwhileediting' );
2637                         }
2638                 }
2639
2640                 // @todo add EditForm plugin interface and use it here!
2641                 //       search for textarea1 and textares2, and allow EditForm to override all uses.
2642                 $wgOut->addHTML( Html::openElement(
2643                         'form',
2644                         [
2645                                 'id' => self::EDITFORM_ID,
2646                                 'name' => self::EDITFORM_ID,
2647                                 'method' => 'post',
2648                                 'action' => $this->getActionURL( $this->getContextTitle() ),
2649                                 'enctype' => 'multipart/form-data'
2650                         ]
2651                 ) );
2652
2653                 if ( is_callable( $formCallback ) ) {
2654                         wfWarn( 'The $formCallback parameter to ' . __METHOD__ . 'is deprecated' );
2655                         call_user_func_array( $formCallback, [ &$wgOut ] );
2656                 }
2657
2658                 // Add an empty field to trip up spambots
2659                 $wgOut->addHTML(
2660                         Xml::openElement( 'div', [ 'id' => 'antispam-container', 'style' => 'display: none;' ] )
2661                         . Html::rawElement(
2662                                 'label',
2663                                 [ 'for' => 'wpAntispam' ],
2664                                 $this->context->msg( 'simpleantispam-label' )->parse()
2665                         )
2666                         . Xml::element(
2667                                 'input',
2668                                 [
2669                                         'type' => 'text',
2670                                         'name' => 'wpAntispam',
2671                                         'id' => 'wpAntispam',
2672                                         'value' => ''
2673                                 ]
2674                         )
2675                         . Xml::closeElement( 'div' )
2676                 );
2677
2678                 Hooks::run( 'EditPage::showEditForm:fields', [ &$this, &$wgOut ] );
2679
2680                 // Put these up at the top to ensure they aren't lost on early form submission
2681                 $this->showFormBeforeText();
2682
2683                 if ( $this->wasDeletedSinceLastEdit() && 'save' == $this->formtype ) {
2684                         $username = $this->lastDelete->user_name;
2685                         $comment = $this->lastDelete->log_comment;
2686
2687                         // It is better to not parse the comment at all than to have templates expanded in the middle
2688                         // TODO: can the checkLabel be moved outside of the div so that wrapWikiMsg could be used?
2689                         $key = $comment === ''
2690                                 ? 'confirmrecreate-noreason'
2691                                 : 'confirmrecreate';
2692                         $wgOut->addHTML(
2693                                 '<div class="mw-confirm-recreate">' .
2694                                         $this->context->msg( $key, $username, "<nowiki>$comment</nowiki>" )->parse() .
2695                                 Xml::checkLabel( $this->context->msg( 'recreate' )->text(), 'wpRecreate', 'wpRecreate', false,
2696                                         [ 'title' => Linker::titleAttrib( 'recreate' ), 'tabindex' => 1, 'id' => 'wpRecreate' ]
2697                                 ) .
2698                                 '</div>'
2699                         );
2700                 }
2701
2702                 # When the summary is hidden, also hide them on preview/show changes
2703                 if ( $this->nosummary ) {
2704                         $wgOut->addHTML( Html::hidden( 'nosummary', true ) );
2705                 }
2706
2707                 # If a blank edit summary was previously provided, and the appropriate
2708                 # user preference is active, pass a hidden tag as wpIgnoreBlankSummary. This will stop the
2709                 # user being bounced back more than once in the event that a summary
2710                 # is not required.
2711                 # ####
2712                 # For a bit more sophisticated detection of blank summaries, hash the
2713                 # automatic one and pass that in the hidden field wpAutoSummary.
2714                 if ( $this->missingSummary || ( $this->section == 'new' && $this->nosummary ) ) {
2715                         $wgOut->addHTML( Html::hidden( 'wpIgnoreBlankSummary', true ) );
2716                 }
2717
2718                 if ( $this->undidRev ) {
2719                         $wgOut->addHTML( Html::hidden( 'wpUndidRevision', $this->undidRev ) );
2720                 }
2721
2722                 if ( $this->selfRedirect ) {
2723                         $wgOut->addHTML( Html::hidden( 'wpIgnoreSelfRedirect', true ) );
2724                 }
2725
2726                 if ( $this->hasPresetSummary ) {
2727                         // If a summary has been preset using &summary= we don't want to prompt for
2728                         // a different summary. Only prompt for a summary if the summary is blanked.
2729                         // (Bug 17416)
2730                         $this->autoSumm = md5( '' );
2731                 }
2732
2733                 $autosumm = $this->autoSumm ? $this->autoSumm : md5( $this->summary );
2734                 $wgOut->addHTML( Html::hidden( 'wpAutoSummary', $autosumm ) );
2735
2736                 $wgOut->addHTML( Html::hidden( 'oldid', $this->oldid ) );
2737                 $wgOut->addHTML( Html::hidden( 'parentRevId', $this->getParentRevId() ) );
2738
2739                 $wgOut->addHTML( Html::hidden( 'format', $this->contentFormat ) );
2740                 $wgOut->addHTML( Html::hidden( 'model', $this->contentModel ) );
2741
2742                 if ( $this->section == 'new' ) {
2743                         $this->showSummaryInput( true, $this->summary );
2744                         $wgOut->addHTML( $this->getSummaryPreview( true, $this->summary ) );
2745                 }
2746
2747                 $wgOut->addHTML( $this->editFormTextBeforeContent );
2748
2749                 if ( !$this->isCssJsSubpage && $showToolbar && $wgUser->getOption( 'showtoolbar' ) ) {
2750                         $wgOut->addHTML( EditPage::getEditToolbar( $this->mTitle ) );
2751                 }
2752
2753                 if ( $this->blankArticle ) {
2754                         $wgOut->addHTML( Html::hidden( 'wpIgnoreBlankArticle', true ) );
2755                 }
2756
2757                 if ( $this->isConflict ) {
2758                         // In an edit conflict bypass the overridable content form method
2759                         // and fallback to the raw wpTextbox1 since editconflicts can't be
2760                         // resolved between page source edits and custom ui edits using the
2761                         // custom edit ui.
2762                         $this->textbox2 = $this->textbox1;
2763
2764                         $content = $this->getCurrentContent();
2765                         $this->textbox1 = $this->toEditText( $content );
2766
2767                         $this->showTextbox1();
2768                 } else {
2769                         $this->showContentForm();
2770                 }
2771
2772                 $wgOut->addHTML( $this->editFormTextAfterContent );
2773
2774                 $this->showStandardInputs();
2775
2776                 $this->showFormAfterText();
2777
2778                 $this->showTosSummary();
2779
2780                 $this->showEditTools();
2781
2782                 $wgOut->addHTML( $this->editFormTextAfterTools . "\n" );
2783
2784                 $wgOut->addHTML( $this->makeTemplatesOnThisPageList( $this->getTemplates() ) );
2785
2786                 $wgOut->addHTML( Html::rawElement( 'div', [ 'class' => 'hiddencats' ],
2787                         Linker::formatHiddenCategories( $this->page->getHiddenCategories() ) ) );
2788
2789                 if ( $this->mParserOutput ) {
2790                         $wgOut->setLimitReportData( $this->mParserOutput->getLimitReportData() );
2791                 }
2792
2793                 $wgOut->addModules( 'mediawiki.action.edit.collapsibleFooter' );
2794
2795                 if ( $this->isConflict ) {
2796                         try {
2797                                 $this->showConflict();
2798                         } catch ( MWContentSerializationException $ex ) {
2799                                 // this can't really happen, but be nice if it does.
2800                                 $msg = $this->context->msg(
2801                                         'content-failed-to-parse',
2802                                         $this->contentModel,
2803                                         $this->contentFormat,
2804                                         $ex->getMessage()
2805                                 );
2806                                 $wgOut->addWikiText( '<div class="error">' . $msg->text() . '</div>' );
2807                         }
2808                 }
2809
2810                 // Set a hidden field so JS knows what edit form mode we are in
2811                 if ( $this->isConflict ) {
2812                         $mode = 'conflict';
2813                 } elseif ( $this->preview ) {
2814                         $mode = 'preview';
2815                 } elseif ( $this->diff ) {
2816                         $mode = 'diff';
2817                 } else {
2818                         $mode = 'text';
2819                 }
2820                 $wgOut->addHTML( Html::hidden( 'mode', $mode, [ 'id' => 'mw-edit-mode' ] ) );
2821
2822                 // Marker for detecting truncated form data.  This must be the last
2823                 // parameter sent in order to be of use, so do not move me.
2824                 $wgOut->addHTML( Html::hidden( 'wpUltimateParam', true ) );
2825                 $wgOut->addHTML( $this->editFormTextBottom . "\n</form>\n" );
2826
2827                 if ( !$wgUser->getOption( 'previewontop' ) ) {
2828                         $this->displayPreviewArea( $previewOutput, false );
2829                 }
2830
2831         }
2832
2833         /**
2834          * Wrapper around TemplatesOnThisPageFormatter to make
2835          * a "templates on this page" list.
2836          *
2837          * @param Title[] $templates
2838          * @return string HTML
2839          */
2840         protected function makeTemplatesOnThisPageList( array $templates ) {
2841                 $templateListFormatter = new TemplatesOnThisPageFormatter(
2842                         $this->context, MediaWikiServices::getInstance()->getLinkRenderer()
2843                 );
2844
2845                 // preview if preview, else section if section, else false
2846                 $type = false;
2847                 if ( $this->preview ) {
2848                         $type = 'preview';
2849                 } elseif ( $this->section != '' ) {
2850                         $type = 'section';
2851                 }
2852
2853                 return Html::rawElement( 'div', [ 'class' => 'templatesUsed' ],
2854                         $templateListFormatter->format( $templates, $type )
2855                 );
2856
2857         }
2858
2859         /**
2860          * Extract the section title from current section text, if any.
2861          *
2862          * @param string $text
2863          * @return string|bool String or false
2864          */
2865         public static function extractSectionTitle( $text ) {
2866                 preg_match( "/^(=+)(.+)\\1\\s*(\n|$)/i", $text, $matches );
2867                 if ( !empty( $matches[2] ) ) {
2868                         global $wgParser;
2869                         return $wgParser->stripSectionName( trim( $matches[2] ) );
2870                 } else {
2871                         return false;
2872                 }
2873         }
2874
2875         /**
2876          * @return bool
2877          */
2878         protected function showHeader() {
2879                 global $wgOut, $wgUser, $wgMaxArticleSize, $wgLang;
2880                 global $wgAllowUserCss, $wgAllowUserJs;
2881
2882                 if ( $this->mTitle->isTalkPage() ) {
2883                         $wgOut->addWikiMsg( 'talkpagetext' );
2884                 }
2885
2886                 // Add edit notices
2887                 $editNotices = $this->mTitle->getEditNotices( $this->oldid );
2888                 if ( count( $editNotices ) ) {
2889                         $wgOut->addHTML( implode( "\n", $editNotices ) );
2890                 } else {
2891                         $msg = $this->context->msg( 'editnotice-notext' );
2892                         if ( !$msg->isDisabled() ) {
2893                                 $wgOut->addHTML(
2894                                         '<div class="mw-editnotice-notext">'
2895                                         . $msg->parseAsBlock()
2896                                         . '</div>'
2897                                 );
2898                         }
2899                 }
2900
2901                 if ( $this->isConflict ) {
2902                         $wgOut->wrapWikiMsg( "<div class='mw-explainconflict'>\n$1\n</div>", 'explainconflict' );
2903                         $this->editRevId = $this->page->getLatest();
2904                 } else {
2905                         if ( $this->section != '' && !$this->isSectionEditSupported() ) {
2906                                 // We use $this->section to much before this and getVal('wgSection') directly in other places
2907                                 // at this point we can't reset $this->section to '' to fallback to non-section editing.
2908                                 // Someone is welcome to try refactoring though
2909                                 $wgOut->showErrorPage( 'sectioneditnotsupported-title', 'sectioneditnotsupported-text' );
2910                                 return false;
2911                         }
2912
2913                         if ( $this->section != '' && $this->section != 'new' ) {
2914                                 if ( !$this->summary && !$this->preview && !$this->diff ) {
2915                                         $sectionTitle = self::extractSectionTitle( $this->textbox1 ); // FIXME: use Content object
2916                                         if ( $sectionTitle !== false ) {
2917                                                 $this->summary = "/* $sectionTitle */ ";
2918                                         }
2919                                 }
2920                         }
2921
2922                         if ( $this->missingComment ) {
2923                                 $wgOut->wrapWikiMsg( "<div id='mw-missingcommenttext'>\n$1\n</div>", 'missingcommenttext' );
2924                         }
2925
2926                         if ( $this->missingSummary && $this->section != 'new' ) {
2927                                 $wgOut->wrapWikiMsg( "<div id='mw-missingsummary'>\n$1\n</div>", 'missingsummary' );
2928                         }
2929
2930                         if ( $this->missingSummary && $this->section == 'new' ) {
2931                                 $wgOut->wrapWikiMsg( "<div id='mw-missingcommentheader'>\n$1\n</div>", 'missingcommentheader' );
2932                         }
2933
2934                         if ( $this->blankArticle ) {
2935                                 $wgOut->wrapWikiMsg( "<div id='mw-blankarticle'>\n$1\n</div>", 'blankarticle' );
2936                         }
2937
2938                         if ( $this->selfRedirect ) {
2939                                 $wgOut->wrapWikiMsg( "<div id='mw-selfredirect'>\n$1\n</div>", 'selfredirect' );
2940                         }
2941
2942                         if ( $this->hookError !== '' ) {
2943                                 $wgOut->addWikiText( $this->hookError );
2944                         }
2945
2946                         if ( !$this->checkUnicodeCompliantBrowser() ) {
2947                                 $wgOut->addWikiMsg( 'nonunicodebrowser' );
2948                         }
2949
2950                         if ( $this->section != 'new' ) {
2951                                 $revision = $this->mArticle->getRevisionFetched();
2952                                 if ( $revision ) {
2953                                         // Let sysop know that this will make private content public if saved
2954
2955                                         if ( !$revision->userCan( Revision::DELETED_TEXT, $wgUser ) ) {
2956                                                 $wgOut->wrapWikiMsg(
2957                                                         "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
2958                                                         'rev-deleted-text-permission'
2959                                                 );
2960                                         } elseif ( $revision->isDeleted( Revision::DELETED_TEXT ) ) {
2961                                                 $wgOut->wrapWikiMsg(
2962                                                         "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
2963                                                         'rev-deleted-text-view'
2964                                                 );
2965                                         }
2966
2967                                         if ( !$revision->isCurrent() ) {
2968                                                 $this->mArticle->setOldSubtitle( $revision->getId() );
2969                                                 $wgOut->addWikiMsg( 'editingold' );
2970                                         }
2971                                 } elseif ( $this->mTitle->exists() ) {
2972                                         // Something went wrong
2973
2974                                         $wgOut->wrapWikiMsg( "<div class='errorbox'>\n$1\n</div>\n",
2975                                                 [ 'missing-revision', $this->oldid ] );
2976                                 }
2977                         }
2978                 }
2979
2980                 if ( wfReadOnly() ) {
2981                         $wgOut->wrapWikiMsg(
2982                                 "<div id=\"mw-read-only-warning\">\n$1\n</div>",
2983                                 [ 'readonlywarning', wfReadOnlyReason() ]
2984                         );
2985                 } elseif ( $wgUser->isAnon() ) {
2986                         if ( $this->formtype != 'preview' ) {
2987                                 $wgOut->wrapWikiMsg(
2988                                         "<div id='mw-anon-edit-warning' class='warningbox'>\n$1\n</div>",
2989                                         [ 'anoneditwarning',
2990                                                 // Log-in link
2991                                                 SpecialPage::getTitleFor( 'Userlogin' )->getFullURL( [
2992                                                         'returnto' => $this->getTitle()->getPrefixedDBkey()
2993                                                 ] ),
2994                                                 // Sign-up link
2995                                                 SpecialPage::getTitleFor( 'CreateAccount' )->getFullURL( [
2996                                                         'returnto' => $this->getTitle()->getPrefixedDBkey()
2997                                                 ] )
2998                                         ]
2999                                 );
3000                         } else {
3001                                 $wgOut->wrapWikiMsg( "<div id=\"mw-anon-preview-warning\" class=\"warningbox\">\n$1</div>",
3002                                         'anonpreviewwarning'
3003                                 );
3004                         }
3005                 } else {
3006                         if ( $this->isCssJsSubpage ) {
3007                                 # Check the skin exists
3008                                 if ( $this->isWrongCaseCssJsPage ) {
3009                                         $wgOut->wrapWikiMsg(
3010                                                 "<div class='error' id='mw-userinvalidcssjstitle'>\n$1\n</div>",
3011                                                 [ 'userinvalidcssjstitle', $this->mTitle->getSkinFromCssJsSubpage() ]
3012                                         );
3013                                 }
3014                                 if ( $this->getTitle()->isSubpageOf( $wgUser->getUserPage() ) ) {
3015                                         $wgOut->wrapWikiMsg( '<div class="mw-usercssjspublic">$1</div>',
3016                                                 $this->isCssSubpage ? 'usercssispublic' : 'userjsispublic'
3017                                         );
3018                                         if ( $this->formtype !== 'preview' ) {
3019                                                 if ( $this->isCssSubpage && $wgAllowUserCss ) {
3020                                                         $wgOut->wrapWikiMsg(
3021                                                                 "<div id='mw-usercssyoucanpreview'>\n$1\n</div>",
3022                                                                 [ 'usercssyoucanpreview' ]
3023                                                         );
3024                                                 }
3025
3026                                                 if ( $this->isJsSubpage && $wgAllowUserJs ) {
3027                                                         $wgOut->wrapWikiMsg(
3028                                                                 "<div id='mw-userjsyoucanpreview'>\n$1\n</div>",
3029                                                                 [ 'userjsyoucanpreview' ]
3030                                                         );
3031                                                 }
3032                                         }
3033                                 }
3034                         }
3035                 }
3036
3037                 if ( $this->mTitle->isProtected( 'edit' ) &&
3038                         MWNamespace::getRestrictionLevels( $this->mTitle->getNamespace() ) !== [ '' ]
3039                 ) {
3040                         # Is the title semi-protected?
3041                         if ( $this->mTitle->isSemiProtected() ) {
3042                                 $noticeMsg = 'semiprotectedpagewarning';
3043                         } else {
3044                                 # Then it must be protected based on static groups (regular)
3045                                 $noticeMsg = 'protectedpagewarning';
3046                         }
3047                         LogEventsList::showLogExtract( $wgOut, 'protect', $this->mTitle, '',
3048                                 [ 'lim' => 1, 'msgKey' => [ $noticeMsg ] ] );
3049                 }
3050                 if ( $this->mTitle->isCascadeProtected() ) {
3051                         # Is this page under cascading protection from some source pages?
3052                         /** @var Title[] $cascadeSources */
3053                         list( $cascadeSources, /* $restrictions */ ) = $this->mTitle->getCascadeProtectionSources();
3054                         $notice = "<div class='mw-cascadeprotectedwarning'>\n$1\n";
3055                         $cascadeSourcesCount = count( $cascadeSources );
3056                         if ( $cascadeSourcesCount > 0 ) {
3057                                 # Explain, and list the titles responsible
3058                                 foreach ( $cascadeSources as $page ) {
3059                                         $notice .= '* [[:' . $page->getPrefixedText() . "]]\n";
3060                                 }
3061                         }
3062                         $notice .= '</div>';
3063                         $wgOut->wrapWikiMsg( $notice, [ 'cascadeprotectedwarning', $cascadeSourcesCount ] );
3064                 }
3065                 if ( !$this->mTitle->exists() && $this->mTitle->getRestrictions( 'create' ) ) {
3066                         LogEventsList::showLogExtract( $wgOut, 'protect', $this->mTitle, '',
3067                                 [ 'lim' => 1,
3068                                         'showIfEmpty' => false,
3069                                         'msgKey' => [ 'titleprotectedwarning' ],
3070                                         'wrap' => "<div class=\"mw-titleprotectedwarning\">\n$1</div>" ] );
3071                 }
3072
3073                 if ( $this->contentLength === false ) {
3074                         $this->contentLength = strlen( $this->textbox1 );
3075                 }
3076
3077                 if ( $this->tooBig || $this->contentLength > $wgMaxArticleSize * 1024 ) {
3078                         $wgOut->wrapWikiMsg( "<div class='error' id='mw-edit-longpageerror'>\n$1\n</div>",
3079                                 [
3080                                         'longpageerror',
3081                                         $wgLang->formatNum( round( $this->contentLength / 1024, 3 ) ),
3082                                         $wgLang->formatNum( $wgMaxArticleSize )
3083                                 ]
3084                         );
3085                 } else {
3086                         if ( !$this->context->msg( 'longpage-hint' )->isDisabled() ) {
3087                                 $wgOut->wrapWikiMsg( "<div id='mw-edit-longpage-hint'>\n$1\n</div>",
3088                                         [
3089                                                 'longpage-hint',
3090                                                 $wgLang->formatSize( strlen( $this->textbox1 ) ),
3091                                                 strlen( $this->textbox1 )
3092                                         ]
3093                                 );
3094                         }
3095                 }
3096                 # Add header copyright warning
3097                 $this->showHeaderCopyrightWarning();
3098
3099                 return true;
3100         }
3101
3102         /**
3103          * Standard summary input and label (wgSummary), abstracted so EditPage
3104          * subclasses may reorganize the form.
3105          * Note that you do not need to worry about the label's for=, it will be
3106          * inferred by the id given to the input. You can remove them both by
3107          * passing [ 'id' => false ] to $userInputAttrs.
3108          *
3109          * @param string $summary The value of the summary input
3110          * @param string $labelText The html to place inside the label
3111          * @param array $inputAttrs Array of attrs to use on the input
3112          * @param array $spanLabelAttrs Array of attrs to use on the span inside the label
3113          *
3114          * @return array An array in the format [ $label, $input ]
3115          */
3116         function getSummaryInput( $summary = "", $labelText = null,
3117                 $inputAttrs = null, $spanLabelAttrs = null
3118         ) {
3119                 // Note: the maxlength is overridden in JS to 255 and to make it use UTF-8 bytes, not characters.
3120                 $inputAttrs = ( is_array( $inputAttrs ) ? $inputAttrs : [] ) + [
3121                         'id' => 'wpSummary',
3122                         'maxlength' => '200',
3123                         'tabindex' => '1',
3124                         'size' => 60,
3125                         'spellcheck' => 'true',
3126                 ] + Linker::tooltipAndAccesskeyAttribs( 'summary' );
3127
3128                 $spanLabelAttrs = ( is_array( $spanLabelAttrs ) ? $spanLabelAttrs : [] ) + [
3129                         'class' => $this->missingSummary ? 'mw-summarymissed' : 'mw-summary',
3130                         'id' => "wpSummaryLabel"
3131                 ];
3132
3133                 $label = null;
3134                 if ( $labelText ) {
3135                         $label = Xml::tags(
3136                                 'label',
3137                                 $inputAttrs['id'] ? [ 'for' => $inputAttrs['id'] ] : null,
3138                                 $labelText
3139                         );
3140                         $label = Xml::tags( 'span', $spanLabelAttrs, $label );
3141                 }
3142
3143                 $input = Html::input( 'wpSummary', $summary, 'text', $inputAttrs );
3144
3145                 return [ $label, $input ];
3146         }
3147
3148         /**
3149          * @param bool $isSubjectPreview True if this is the section subject/title
3150          *   up top, or false if this is the comment summary
3151          *   down below the textarea
3152          * @param string $summary The text of the summary to display
3153          */
3154         protected function showSummaryInput( $isSubjectPreview, $summary = "" ) {
3155                 global $wgOut;
3156                 # Add a class if 'missingsummary' is triggered to allow styling of the summary line
3157                 $summaryClass = $this->missingSummary ? 'mw-summarymissed' : 'mw-summary';
3158                 if ( $isSubjectPreview ) {
3159                         if ( $this->nosummary ) {
3160                                 return;
3161                         }
3162                 } else {
3163                         if ( !$this->mShowSummaryField ) {
3164                                 return;
3165                         }
3166                 }
3167                 $labelText = $this->context->msg( $isSubjectPreview ? 'subject' : 'summary' )->parse();
3168                 list( $label, $input ) = $this->getSummaryInput(
3169                         $summary,
3170                         $labelText,
3171                         [ 'class' => $summaryClass ],
3172                         []
3173                 );
3174                 $wgOut->addHTML( "{$label} {$input}" );
3175         }
3176
3177         /**
3178          * @param bool $isSubjectPreview True if this is the section subject/title
3179          *   up top, or false if this is the comment summary
3180          *   down below the textarea
3181          * @param string $summary The text of the summary to display
3182          * @return string
3183          */
3184         protected function getSummaryPreview( $isSubjectPreview, $summary = "" ) {
3185                 // avoid spaces in preview, gets always trimmed on save
3186                 $summary = trim( $summary );
3187                 if ( !$summary || ( !$this->preview && !$this->diff ) ) {
3188                         return "";
3189                 }
3190
3191                 global $wgParser;
3192
3193                 if ( $isSubjectPreview ) {
3194                         $summary = $this->context->msg( 'newsectionsummary' )
3195                                 ->rawParams( $wgParser->stripSectionName( $summary ) )
3196                                 ->inContentLanguage()->text();
3197                 }
3198
3199                 $message = $isSubjectPreview ? 'subject-preview' : 'summary-preview';
3200
3201                 $summary = $this->context->msg( $message )->parse()
3202                         . Linker::commentBlock( $summary, $this->mTitle, $isSubjectPreview );
3203                 return Xml::tags( 'div', [ 'class' => 'mw-summary-preview' ], $summary );
3204         }
3205
3206         protected function showFormBeforeText() {
3207                 global $wgOut;
3208                 $section = htmlspecialchars( $this->section );
3209                 $wgOut->addHTML( <<<HTML
3210 <input type='hidden' value="{$section}" name="wpSection"/>
3211 <input type='hidden' value="{$this->starttime}" name="wpStarttime" />
3212 <input type='hidden' value="{$this->edittime}" name="wpEdittime" />
3213 <input type='hidden' value="{$this->editRevId}" name="editRevId" />
3214 <input type='hidden' value="{$this->scrolltop}" name="wpScrolltop" id="wpScrolltop" />
3215
3216 HTML
3217                 );
3218                 if ( !$this->checkUnicodeCompliantBrowser() ) {
3219                         $wgOut->addHTML( Html::hidden( 'safemode', '1' ) );
3220                 }
3221         }
3222
3223         protected function showFormAfterText() {
3224                 global $wgOut, $wgUser;
3225                 /**
3226                  * To make it harder for someone to slip a user a page
3227                  * which submits an edit form to the wiki without their
3228                  * knowledge, a random token is associated with the login
3229                  * session. If it's not passed back with the submission,
3230                  * we won't save the page, or render user JavaScript and
3231                  * CSS previews.
3232                  *
3233                  * For anon editors, who may not have a session, we just
3234                  * include the constant suffix to prevent editing from
3235                  * broken text-mangling proxies.
3236                  */
3237                 $wgOut->addHTML( "\n" . Html::hidden( "wpEditToken", $wgUser->getEditToken() ) . "\n" );
3238         }
3239
3240         /**
3241          * Subpage overridable method for printing the form for page content editing
3242          * By default this simply outputs wpTextbox1
3243          * Subclasses can override this to provide a custom UI for editing;
3244          * be it a form, or simply wpTextbox1 with a modified content that will be
3245          * reverse modified when extracted from the post data.
3246          * Note that this is basically the inverse for importContentFormData
3247          */
3248         protected function showContentForm() {
3249                 $this->showTextbox1();
3250         }
3251
3252         /**
3253          * Method to output wpTextbox1
3254          * The $textoverride method can be used by subclasses overriding showContentForm
3255          * to pass back to this method.
3256          *
3257          * @param array $customAttribs Array of html attributes to use in the textarea
3258          * @param string $textoverride Optional text to override $this->textarea1 with
3259          */
3260         protected function showTextbox1( $customAttribs = null, $textoverride = null ) {
3261                 if ( $this->wasDeletedSinceLastEdit() && $this->formtype == 'save' ) {
3262                         $attribs = [ 'style' => 'display:none;' ];
3263                 } else {
3264                         $classes = []; // Textarea CSS
3265                         if ( $this->mTitle->isProtected( 'edit' ) &&
3266                                 MWNamespace::getRestrictionLevels( $this->mTitle->getNamespace() ) !== [ '' ]
3267                         ) {
3268                                 # Is the title semi-protected?
3269                                 if ( $this->mTitle->isSemiProtected() ) {
3270                                         $classes[] = 'mw-textarea-sprotected';
3271                                 } else {
3272                                         # Then it must be protected based on static groups (regular)
3273                                         $classes[] = 'mw-textarea-protected';
3274                                 }
3275                                 # Is the title cascade-protected?
3276                                 if ( $this->mTitle->isCascadeProtected() ) {
3277                                         $classes[] = 'mw-textarea-cprotected';
3278                                 }
3279                         }
3280
3281                         $attribs = [ 'tabindex' => 1 ];
3282
3283                         if ( is_array( $customAttribs ) ) {
3284                                 $attribs += $customAttribs;
3285                         }
3286
3287                         if ( count( $classes ) ) {
3288                                 if ( isset( $attribs['class'] ) ) {
3289                                         $classes[] = $attribs['class'];
3290                                 }
3291                                 $attribs['class'] = implode( ' ', $classes );
3292                         }
3293                 }
3294
3295                 $this->showTextbox(
3296                         $textoverride !== null ? $textoverride : $this->textbox1,
3297                         'wpTextbox1',
3298                         $attribs
3299                 );
3300         }
3301
3302         protected function showTextbox2() {
3303                 $this->showTextbox( $this->textbox2, 'wpTextbox2', [ 'tabindex' => 6, 'readonly' ] );
3304         }
3305
3306         protected function showTextbox( $text, $name, $customAttribs = [] ) {
3307                 global $wgOut, $wgUser;
3308
3309                 $wikitext = $this->safeUnicodeOutput( $text );
3310                 if ( strval( $wikitext ) !== '' ) {
3311                         // Ensure there's a newline at the end, otherwise adding lines
3312                         // is awkward.
3313                         // But don't add a newline if the ext is empty, or Firefox in XHTML
3314                         // mode will show an extra newline. A bit annoying.
3315                         $wikitext .= "\n";
3316                 }
3317
3318                 $attribs = $customAttribs + [
3319                         'accesskey' => ',',
3320                         'id' => $name,
3321                         'cols' => $wgUser->getIntOption( 'cols' ),
3322                         'rows' => $wgUser->getIntOption( 'rows' ),
3323                         // Avoid PHP notices when appending preferences
3324                         // (appending allows customAttribs['style'] to still work).
3325                         'style' => ''
3326                 ];
3327
3328                 // The following classes can be used here:
3329                 // * mw-editfont-default
3330                 // * mw-editfont-monospace
3331                 // * mw-editfont-sans-serif
3332                 // * mw-editfont-serif
3333                 $class = 'mw-editfont-' . $wgUser->getOption( 'editfont' );
3334
3335                 if ( isset( $attribs['class'] ) ) {
3336                         if ( is_string( $attribs['class'] ) ) {
3337                                 $attribs['class'] .= ' ' . $class;
3338                         } elseif ( is_array( $attribs['class'] ) ) {
3339                                 $attribs['class'][] = $class;
3340                         }
3341                 } else {
3342                         $attribs['class'] = $class;
3343                 }
3344
3345                 $pageLang = $this->mTitle->getPageLanguage();
3346                 $attribs['lang'] = $pageLang->getHtmlCode();
3347                 $attribs['dir'] = $pageLang->getDir();
3348
3349                 $wgOut->addHTML( Html::textarea( $name, $wikitext, $attribs ) );
3350         }
3351
3352         protected function displayPreviewArea( $previewOutput, $isOnTop = false ) {
3353                 global $wgOut;
3354                 $classes = [];
3355                 if ( $isOnTop ) {
3356                         $classes[] = 'ontop';
3357                 }
3358
3359                 $attribs = [ 'id' => 'wikiPreview', 'class' => implode( ' ', $classes ) ];
3360
3361                 if ( $this->formtype != 'preview' ) {
3362                         $attribs['style'] = 'display: none;';
3363                 }
3364
3365                 $wgOut->addHTML( Xml::openElement( 'div', $attribs ) );
3366
3367                 if ( $this->formtype == 'preview' ) {
3368                         $this->showPreview( $previewOutput );
3369                 } else {
3370                         // Empty content container for LivePreview
3371                         $pageViewLang = $this->mTitle->getPageViewLanguage();
3372                         $attribs = [ 'lang' => $pageViewLang->getHtmlCode(), 'dir' => $pageViewLang->getDir(),
3373                                 'class' => 'mw-content-' . $pageViewLang->getDir() ];
3374                         $wgOut->addHTML( Html::rawElement( 'div', $attribs ) );
3375                 }
3376
3377                 $wgOut->addHTML( '</div>' );
3378
3379                 if ( $this->formtype == 'diff' ) {
3380                         try {
3381                                 $this->showDiff();
3382                         } catch ( MWContentSerializationException $ex ) {
3383                                 $msg = $this->context->msg(
3384                                         'content-failed-to-parse',
3385                                         $this->contentModel,
3386                                         $this->contentFormat,
3387                                         $ex->getMessage()
3388                                 );
3389                                 $wgOut->addWikiText( '<div class="error">' . $msg->text() . '</div>' );
3390                         }
3391                 }
3392         }
3393
3394         /**
3395          * Append preview output to $wgOut.
3396          * Includes category rendering if this is a category page.
3397          *
3398          * @param string $text The HTML to be output for the preview.
3399          */
3400         protected function showPreview( $text ) {
3401                 global $wgOut;
3402                 if ( $this->mTitle->getNamespace() == NS_CATEGORY ) {
3403                         $this->mArticle->openShowCategory();
3404                 }
3405                 # This hook seems slightly odd here, but makes things more
3406                 # consistent for extensions.
3407                 Hooks::run( 'OutputPageBeforeHTML', [ &$wgOut, &$text ] );
3408                 $wgOut->addHTML( $text );
3409                 if ( $this->mTitle->getNamespace() == NS_CATEGORY ) {
3410                         $this->mArticle->closeShowCategory();
3411                 }
3412         }
3413
3414         /**
3415          * Get a diff between the current contents of the edit box and the
3416          * version of the page we're editing from.
3417          *
3418          * If this is a section edit, we'll replace the section as for final
3419          * save and then make a comparison.
3420          */
3421         function showDiff() {
3422                 global $wgUser, $wgContLang, $wgOut;
3423
3424                 $oldtitlemsg = 'currentrev';
3425                 # if message does not exist, show diff against the preloaded default
3426                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI && !$this->mTitle->exists() ) {
3427                         $oldtext = $this->mTitle->getDefaultMessageText();
3428                         if ( $oldtext !== false ) {
3429                                 $oldtitlemsg = 'defaultmessagetext';
3430                                 $oldContent = $this->toEditContent( $oldtext );
3431                         } else {
3432                                 $oldContent = null;
3433                         }
3434                 } else {
3435                         $oldContent = $this->getCurrentContent();
3436                 }
3437
3438                 $textboxContent = $this->toEditContent( $this->textbox1 );
3439                 if ( $this->editRevId !== null ) {
3440                         $newContent = $this->page->replaceSectionAtRev(
3441                                 $this->section, $textboxContent, $this->summary, $this->editRevId
3442                         );
3443                 } else {
3444                         $newContent = $this->page->replaceSectionContent(
3445                                 $this->section, $textboxContent, $this->summary, $this->edittime
3446                         );
3447                 }
3448
3449                 if ( $newContent ) {
3450                         ContentHandler::runLegacyHooks( 'EditPageGetDiffText', [ $this, &$newContent ], '1.21' );
3451                         Hooks::run( 'EditPageGetDiffContent', [ $this, &$newContent ] );
3452
3453                         $popts = ParserOptions::newFromUserAndLang( $wgUser, $wgContLang );
3454                         $newContent = $newContent->preSaveTransform( $this->mTitle, $wgUser, $popts );
3455                 }
3456
3457                 if ( ( $oldContent && !$oldContent->isEmpty() ) || ( $newContent && !$newContent->isEmpty() ) ) {
3458                         $oldtitle = $this->context->msg( $oldtitlemsg )->parse();
3459                         $newtitle = $this->context->msg( 'yourtext' )->parse();
3460
3461                         if ( !$oldContent ) {
3462                                 $oldContent = $newContent->getContentHandler()->makeEmptyContent();
3463                         }
3464
3465                         if ( !$newContent ) {
3466                                 $newContent = $oldContent->getContentHandler()->makeEmptyContent();
3467                         }
3468
3469                         $de = $oldContent->getContentHandler()->createDifferenceEngine( $this->mArticle->getContext() );
3470                         $de->setContent( $oldContent, $newContent );
3471
3472                         $difftext = $de->getDiff( $oldtitle, $newtitle );
3473                         $de->showDiffStyle();
3474                 } else {
3475                         $difftext = '';
3476                 }
3477
3478                 $wgOut->addHTML( '<div id="wikiDiff">' . $difftext . '</div>' );
3479         }
3480
3481         /**
3482          * Show the header copyright warning.
3483          */
3484         protected function showHeaderCopyrightWarning() {
3485                 $msg = 'editpage-head-copy-warn';
3486                 if ( !$this->context->msg( $msg )->isDisabled() ) {
3487                         global $wgOut;
3488                         $wgOut->wrapWikiMsg( "<div class='editpage-head-copywarn'>\n$1\n</div>",
3489                                 'editpage-head-copy-warn' );
3490                 }
3491         }
3492
3493         /**
3494          * Give a chance for site and per-namespace customizations of
3495          * terms of service summary link that might exist separately
3496          * from the copyright notice.
3497          *
3498          * This will display between the save button and the edit tools,
3499          * so should remain short!
3500          */
3501         protected function showTosSummary() {
3502                 $msg = 'editpage-tos-summary';
3503                 Hooks::run( 'EditPageTosSummary', [ $this->mTitle, &$msg ] );
3504                 if ( !$this->context->msg( $msg )->isDisabled() ) {
3505                         global $wgOut;
3506                         $wgOut->addHTML( '<div class="mw-tos-summary">' );
3507                         $wgOut->addWikiMsg( $msg );
3508                         $wgOut->addHTML( '</div>' );
3509                 }
3510         }
3511
3512         protected function showEditTools() {
3513                 global $wgOut;
3514                 $wgOut->addHTML( '<div class="mw-editTools">' .
3515                         $this->context->msg( 'edittools' )->inContentLanguage()->parse() .
3516                         '</div>' );
3517         }
3518
3519         /**
3520          * Get the copyright warning
3521          *
3522          * Renamed to getCopyrightWarning(), old name kept around for backwards compatibility
3523          * @return string
3524          */
3525         protected function getCopywarn() {
3526                 return self::getCopyrightWarning( $this->mTitle );
3527         }
3528
3529         /**
3530          * Get the copyright warning, by default returns wikitext
3531          *
3532          * @param Title $title
3533          * @param string $format Output format, valid values are any function of a Message object
3534          * @return string
3535          */
3536         public static function getCopyrightWarning( $title, $format = 'plain', $langcode = null ) {
3537                 global $wgRightsText;
3538                 if ( $wgRightsText ) {
3539                         $copywarnMsg = [ 'copyrightwarning',
3540                                 '[[' . wfMessage( 'copyrightpage' )->inContentLanguage()->text() . ']]',
3541                                 $wgRightsText ];
3542                 } else {
3543                         $copywarnMsg = [ 'copyrightwarning2',
3544                                 '[[' . wfMessage( 'copyrightpage' )->inContentLanguage()->text() . ']]' ];
3545                 }
3546                 // Allow for site and per-namespace customization of contribution/copyright notice.
3547                 Hooks::run( 'EditPageCopyrightWarning', [ $title, &$copywarnMsg ] );
3548
3549                 $msg = call_user_func_array( 'wfMessage', $copywarnMsg )->title( $title );
3550                 if ( $langcode ) {
3551                         $msg->inLanguage( $langcode );
3552                 }
3553                 return "<div id=\"editpage-copywarn\">\n" .
3554                         $msg->$format() . "\n</div>";
3555         }
3556
3557         /**
3558          * Get the Limit report for page previews
3559          *
3560          * @since 1.22
3561          * @param ParserOutput $output ParserOutput object from the parse
3562          * @return string HTML
3563          */
3564         public static function getPreviewLimitReport( $output ) {
3565                 if ( !$output || !$output->getLimitReportData() ) {
3566                         return '';
3567                 }
3568
3569                 return ResourceLoader::makeInlineScript(
3570                         ResourceLoader::makeConfigSetScript(
3571                                 [ 'wgPageParseReport' => $output->getLimitReportData() ],
3572                                 true
3573                         )
3574                 );
3575         }
3576
3577         protected function showStandardInputs( &$tabindex = 2 ) {
3578                 global $wgOut;
3579                 $wgOut->addHTML( "<div class='editOptions'>\n" );
3580
3581                 if ( $this->section != 'new' ) {
3582                         $this->showSummaryInput( false, $this->summary );
3583                         $wgOut->addHTML( $this->getSummaryPreview( false, $this->summary ) );
3584                 }
3585
3586                 $checkboxes = $this->getCheckboxes( $tabindex,
3587                         [ 'minor' => $this->minoredit, 'watch' => $this->watchthis ] );
3588                 $wgOut->addHTML( "<div class='editCheckboxes'>" . implode( $checkboxes, "\n" ) . "</div>\n" );
3589
3590                 // Show copyright warning.
3591                 $wgOut->addWikiText( $this->getCopywarn() );
3592                 $wgOut->addHTML( $this->editFormTextAfterWarn );
3593
3594                 $wgOut->addHTML( "<div class='editButtons'>\n" );
3595                 $wgOut->addHTML( implode( $this->getEditButtons( $tabindex ), "\n" ) . "\n" );
3596
3597                 $cancel = $this->getCancelLink();
3598                 if ( $cancel !== '' ) {
3599                         $cancel .= Html::element( 'span',
3600                                 [ 'class' => 'mw-editButtons-pipe-separator' ],
3601                                 $this->context->msg( 'pipe-separator' )->text() );
3602                 }
3603
3604                 $message = $this->context->msg( 'edithelppage' )->inContentLanguage()->text();
3605                 $edithelpurl = Skin::makeInternalOrExternalUrl( $message );
3606                 $attrs = [
3607                         'target' => 'helpwindow',
3608                         'href' => $edithelpurl,
3609                 ];
3610                 $edithelp = Html::linkButton( $this->context->msg( 'edithelp' )->text(),
3611                         $attrs, [ 'mw-ui-quiet' ] ) .
3612                         $this->context->msg( 'word-separator' )->escaped() .
3613                         $this->context->msg( 'newwindow' )->parse();
3614
3615                 $wgOut->addHTML( "      <span class='cancelLink'>{$cancel}</span>\n" );
3616                 $wgOut->addHTML( "      <span class='editHelp'>{$edithelp}</span>\n" );
3617                 $wgOut->addHTML( "</div><!-- editButtons -->\n" );
3618
3619                 Hooks::run( 'EditPage::showStandardInputs:options', [ $this, $wgOut, &$tabindex ] );
3620
3621                 $wgOut->addHTML( "</div><!-- editOptions -->\n" );
3622         }
3623
3624         /**
3625          * Show an edit conflict. textbox1 is already shown in showEditForm().
3626          * If you want to use another entry point to this function, be careful.
3627          */
3628         protected function showConflict() {
3629                 global $wgOut;
3630
3631                 if ( Hooks::run( 'EditPageBeforeConflictDiff', [ &$this, &$wgOut ] ) ) {
3632                         $stats = $wgOut->getContext()->getStats();
3633                         $stats->increment( 'edit.failures.conflict' );
3634                         // Only include 'standard' namespaces to avoid creating unknown numbers of statsd metrics
3635                         if (
3636                                 $this->mTitle->getNamespace() >= NS_MAIN &&
3637                                 $this->mTitle->getNamespace() <= NS_CATEGORY_TALK
3638                         ) {
3639                                 $stats->increment( 'edit.failures.conflict.byNamespaceId.' . $this->mTitle->getNamespace() );
3640                         }
3641
3642                         $wgOut->wrapWikiMsg( '<h2>$1</h2>', "yourdiff" );
3643
3644                         $content1 = $this->toEditContent( $this->textbox1 );
3645                         $content2 = $this->toEditContent( $this->textbox2 );
3646
3647                         $handler = ContentHandler::getForModelID( $this->contentModel );
3648                         $de = $handler->createDifferenceEngine( $this->mArticle->getContext() );
3649                         $de->setContent( $content2, $content1 );
3650                         $de->showDiff(
3651                                 $this->context->msg( 'yourtext' )->parse(),
3652                                 $this->context->msg( 'storedversion' )->text()
3653                         );
3654
3655                         $wgOut->wrapWikiMsg( '<h2>$1</h2>', "yourtext" );
3656                         $this->showTextbox2();
3657                 }
3658         }
3659
3660         /**
3661          * @return string
3662          */
3663         public function getCancelLink() {
3664                 $cancelParams = [];
3665                 if ( !$this->isConflict && $this->oldid > 0 ) {
3666                         $cancelParams['oldid'] = $this->oldid;
3667                 } elseif ( $this->getContextTitle()->isRedirect() ) {
3668                         $cancelParams['redirect'] = 'no';
3669                 }
3670                 $attrs = [ 'id' => 'mw-editform-cancel' ];
3671
3672                 return Linker::linkKnown(
3673                         $this->getContextTitle(),
3674                         $this->context->msg( 'cancel' )->parse(),
3675                         Html::buttonAttributes( $attrs, [ 'mw-ui-quiet' ] ),
3676                         $cancelParams
3677                 );
3678         }
3679
3680         /**
3681          * Returns the URL to use in the form's action attribute.
3682          * This is used by EditPage subclasses when simply customizing the action
3683          * variable in the constructor is not enough. This can be used when the
3684          * EditPage lives inside of a Special page rather than a custom page action.
3685          *
3686          * @param Title $title Title object for which is being edited (where we go to for &action= links)
3687          * @return string
3688          */
3689         protected function getActionURL( Title $title ) {
3690                 return $title->getLocalURL( [ 'action' => $this->action ] );
3691         }
3692
3693         /**
3694          * Check if a page was deleted while the user was editing it, before submit.
3695          * Note that we rely on the logging table, which hasn't been always there,
3696          * but that doesn't matter, because this only applies to brand new
3697          * deletes.
3698          * @return bool
3699          */
3700         protected function wasDeletedSinceLastEdit() {
3701                 if ( $this->deletedSinceEdit !== null ) {
3702                         return $this->deletedSinceEdit;
3703                 }
3704
3705                 $this->deletedSinceEdit = false;
3706
3707                 if ( !$this->mTitle->exists() && $this->mTitle->isDeletedQuick() ) {
3708                         $this->lastDelete = $this->getLastDelete();
3709                         if ( $this->lastDelete ) {
3710                                 $deleteTime = wfTimestamp( TS_MW, $this->lastDelete->log_timestamp );
3711                                 if ( $deleteTime > $this->starttime ) {
3712                                         $this->deletedSinceEdit = true;
3713                                 }
3714                         }
3715                 }
3716
3717                 return $this->deletedSinceEdit;
3718         }
3719
3720         /**
3721          * @return bool|stdClass
3722          */
3723         protected function getLastDelete() {
3724                 $dbr = wfGetDB( DB_REPLICA );
3725                 $data = $dbr->selectRow(
3726                         [ 'logging', 'user' ],
3727                         [
3728                                 'log_type',
3729                                 'log_action',
3730                                 'log_timestamp',
3731                                 'log_user',
3732                                 'log_namespace',
3733                                 'log_title',
3734                                 'log_comment',
3735                                 'log_params',
3736                                 'log_deleted',
3737                                 'user_name'
3738                         ], [
3739                                 'log_namespace' => $this->mTitle->getNamespace(),
3740                                 'log_title' => $this->mTitle->getDBkey(),
3741                                 'log_type' => 'delete',
3742                                 'log_action' => 'delete',
3743                                 'user_id=log_user'
3744                         ],
3745                         __METHOD__,
3746                         [ 'LIMIT' => 1, 'ORDER BY' => 'log_timestamp DESC' ]
3747                 );
3748                 // Quick paranoid permission checks...
3749                 if ( is_object( $data ) ) {
3750                         if ( $data->log_deleted & LogPage::DELETED_USER ) {
3751                                 $data->user_name = $this->context->msg( 'rev-deleted-user' )->escaped();
3752                         }
3753
3754                         if ( $data->log_deleted & LogPage::DELETED_COMMENT ) {
3755                                 $data->log_comment = $this->context->msg( 'rev-deleted-comment' )->escaped();
3756                         }
3757                 }
3758
3759                 return $data;
3760         }
3761
3762         /**
3763          * Get the rendered text for previewing.
3764          * @throws MWException
3765          * @return string
3766          */
3767         function getPreviewText() {
3768                 global $wgOut, $wgRawHtml, $wgLang;
3769                 global $wgAllowUserCss, $wgAllowUserJs;
3770
3771                 $stats = $wgOut->getContext()->getStats();
3772
3773                 if ( $wgRawHtml && !$this->mTokenOk ) {
3774                         // Could be an offsite preview attempt. This is very unsafe if
3775                         // HTML is enabled, as it could be an attack.
3776                         $parsedNote = '';
3777                         if ( $this->textbox1 !== '' ) {
3778                                 // Do not put big scary notice, if previewing the empty
3779                                 // string, which happens when you initially edit
3780                                 // a category page, due to automatic preview-on-open.
3781                                 $parsedNote = $wgOut->parse( "<div class='previewnote'>" .
3782                                         $this->context->msg( 'session_fail_preview_html' )->text() . "</div>",
3783                                         true, /* interface */true );
3784                         }
3785                         $stats->increment( 'edit.failures.session_loss' );
3786                         return $parsedNote;
3787                 }
3788
3789                 $note = '';
3790
3791                 try {
3792                         $content = $this->toEditContent( $this->textbox1 );
3793
3794                         $previewHTML = '';
3795                         if ( !Hooks::run(
3796                                 'AlternateEditPreview',
3797                                 [ $this, &$content, &$previewHTML, &$this->mParserOutput ] )
3798                         ) {
3799                                 return $previewHTML;
3800                         }
3801
3802                         # provide a anchor link to the editform
3803                         $continueEditing = '<span class="mw-continue-editing">' .
3804                                 '[[#' . self::EDITFORM_ID . '|' . $wgLang->getArrow() . ' ' .
3805                                 $this->context->msg( 'continue-editing' )->text() . ']]</span>';
3806                         if ( $this->mTriedSave && !$this->mTokenOk ) {
3807                                 if ( $this->mTokenOkExceptSuffix ) {
3808                                         $note = $this->context->msg( 'token_suffix_mismatch' )->plain();
3809                                         $stats->increment( 'edit.failures.bad_token' );
3810                                 } else {
3811                                         $note = $this->context->msg( 'session_fail_preview' )->plain();
3812                                         $stats->increment( 'edit.failures.session_loss' );
3813                                 }
3814                         } elseif ( $this->incompleteForm ) {
3815                                 $note = $this->context->msg( 'edit_form_incomplete' )->plain();
3816                                 if ( $this->mTriedSave ) {
3817                                         $stats->increment( 'edit.failures.incomplete_form' );
3818                                 }
3819                         } else {
3820                                 $note = $this->context->msg( 'previewnote' )->plain() . ' ' . $continueEditing;
3821                         }
3822
3823                         # don't parse non-wikitext pages, show message about preview
3824                         if ( $this->mTitle->isCssJsSubpage() || $this->mTitle->isCssOrJsPage() ) {
3825                                 if ( $this->mTitle->isCssJsSubpage() ) {
3826                                         $level = 'user';
3827                                 } elseif ( $this->mTitle->isCssOrJsPage() ) {
3828                                         $level = 'site';
3829                                 } else {
3830                                         $level = false;
3831                                 }
3832
3833                                 if ( $content->getModel() == CONTENT_MODEL_CSS ) {
3834                                         $format = 'css';
3835                                         if ( $level === 'user' && !$wgAllowUserCss ) {
3836                                                 $format = false;
3837                                         }
3838                                 } elseif ( $content->getModel() == CONTENT_MODEL_JAVASCRIPT ) {
3839                                         $format = 'js';
3840                                         if ( $level === 'user' && !$wgAllowUserJs ) {
3841                                                 $format = false;
3842                                         }
3843                                 } else {
3844                                         $format = false;
3845                                 }
3846
3847                                 # Used messages to make sure grep find them:
3848                                 # Messages: usercsspreview, userjspreview, sitecsspreview, sitejspreview
3849                                 if ( $level && $format ) {
3850                                         $note = "<div id='mw-{$level}{$format}preview'>" .
3851                                                 $this->context->msg( "{$level}{$format}preview" )->text() .
3852                                                 ' ' . $continueEditing . "</div>";
3853                                 }
3854                         }
3855
3856                         # If we're adding a comment, we need to show the
3857                         # summary as the headline
3858                         if ( $this->section === "new" && $this->summary !== "" ) {
3859                                 $content = $content->addSectionHeader( $this->summary );
3860                         }
3861
3862                         $hook_args = [ $this, &$content ];
3863                         ContentHandler::runLegacyHooks( 'EditPageGetPreviewText', $hook_args, '1.25' );
3864                         Hooks::run( 'EditPageGetPreviewContent', $hook_args );
3865
3866                         $parserResult = $this->doPreviewParse( $content );
3867                         $parserOutput = $parserResult['parserOutput'];
3868                         $previewHTML = $parserResult['html'];
3869                         $this->mParserOutput = $parserOutput;
3870                         $wgOut->addParserOutputMetadata( $parserOutput );
3871
3872                         if ( count( $parserOutput->getWarnings() ) ) {
3873                                 $note .= "\n\n" . implode( "\n\n", $parserOutput->getWarnings() );
3874                         }
3875
3876                 } catch ( MWContentSerializationException $ex ) {
3877                         $m = $this->context->msg(
3878                                 'content-failed-to-parse',
3879                                 $this->contentModel,
3880                                 $this->contentFormat,
3881                                 $ex->getMessage()
3882                         );
3883                         $note .= "\n\n" . $m->parse();
3884                         $previewHTML = '';
3885                 }
3886
3887                 if ( $this->isConflict ) {
3888                         $conflict = '<h2 id="mw-previewconflict">'
3889                                 . $this->context->msg( 'previewconflict' )->escaped() . "</h2>\n";
3890                 } else {
3891                         $conflict = '<hr />';
3892                 }
3893
3894                 $previewhead = "<div class='previewnote'>\n" .
3895                         '<h2 id="mw-previewheader">' . $this->context->msg( 'preview' )->escaped() . "</h2>" .
3896                         $wgOut->parse( $note, true, /* interface */true ) . $conflict . "</div>\n";
3897
3898                 $pageViewLang = $this->mTitle->getPageViewLanguage();
3899                 $attribs = [ 'lang' => $pageViewLang->getHtmlCode(), 'dir' => $pageViewLang->getDir(),
3900                         'class' => 'mw-content-' . $pageViewLang->getDir() ];
3901                 $previewHTML = Html::rawElement( 'div', $attribs, $previewHTML );
3902
3903                 return $previewhead . $previewHTML . $this->previewTextAfterContent;
3904         }
3905
3906         /**
3907          * Get parser options for a preview
3908          * @return ParserOptions
3909          */
3910         protected function getPreviewParserOptions() {
3911                 $parserOptions = $this->page->makeParserOptions( $this->mArticle->getContext() );
3912                 $parserOptions->setIsPreview( true );
3913                 $parserOptions->setIsSectionPreview( !is_null( $this->section ) && $this->section !== '' );
3914                 $parserOptions->enableLimitReport();
3915                 return $parserOptions;
3916         }
3917
3918         /**
3919          * Parse the page for a preview. Subclasses may override this class, in order
3920          * to parse with different options, or to otherwise modify the preview HTML.
3921          *
3922          * @param Content $content The page content
3923          * @return array with keys:
3924          *   - parserOutput: The ParserOutput object
3925          *   - html: The HTML to be displayed
3926          */
3927         protected function doPreviewParse( Content $content ) {
3928                 global $wgUser;
3929                 $parserOptions = $this->getPreviewParserOptions();
3930                 $pstContent = $content->preSaveTransform( $this->mTitle, $wgUser, $parserOptions );
3931                 $scopedCallback = $parserOptions->setupFakeRevision(
3932                         $this->mTitle, $pstContent, $wgUser );
3933                 $parserOutput = $pstContent->getParserOutput( $this->mTitle, null, $parserOptions );
3934                 ScopedCallback::consume( $scopedCallback );
3935                 $parserOutput->setEditSectionTokens( false ); // no section edit links
3936                 return [
3937                         'parserOutput' => $parserOutput,
3938                         'html' => $parserOutput->getText() ];
3939         }
3940
3941         /**
3942          * @return array
3943          */
3944         function getTemplates() {
3945                 if ( $this->preview || $this->section != '' ) {
3946                         $templates = [];
3947                         if ( !isset( $this->mParserOutput ) ) {
3948                                 return $templates;
3949                         }
3950                         foreach ( $this->mParserOutput->getTemplates() as $ns => $template ) {
3951                                 foreach ( array_keys( $template ) as $dbk ) {
3952                                         $templates[] = Title::makeTitle( $ns, $dbk );
3953                                 }
3954                         }
3955                         return $templates;
3956                 } else {
3957                         return $this->mTitle->getTemplateLinksFrom();
3958                 }
3959         }
3960
3961         /**
3962          * Shows a bulletin board style toolbar for common editing functions.
3963          * It can be disabled in the user preferences.
3964          *
3965          * @param Title $title Title object for the page being edited (optional)
3966          * @return string
3967          */
3968         static function getEditToolbar( $title = null ) {
3969                 global $wgContLang, $wgOut;
3970                 global $wgEnableUploads, $wgForeignFileRepos;
3971
3972                 $imagesAvailable = $wgEnableUploads || count( $wgForeignFileRepos );
3973                 $showSignature = true;
3974                 if ( $title ) {
3975                         $showSignature = MWNamespace::wantSignatures( $title->getNamespace() );
3976                 }
3977
3978                 /**
3979                  * $toolarray is an array of arrays each of which includes the
3980                  * opening tag, the closing tag, optionally a sample text that is
3981                  * inserted between the two when no selection is highlighted
3982                  * and.  The tip text is shown when the user moves the mouse
3983                  * over the button.
3984                  *
3985                  * Images are defined in ResourceLoaderEditToolbarModule.
3986                  */
3987                 $toolarray = [
3988                         [
3989                                 'id'     => 'mw-editbutton-bold',
3990                                 'open'   => '\'\'\'',
3991                                 'close'  => '\'\'\'',
3992                                 'sample' => wfMessage( 'bold_sample' )->text(),
3993                                 'tip'    => wfMessage( 'bold_tip' )->text(),
3994                         ],
3995                         [
3996                                 'id'     => 'mw-editbutton-italic',
3997                                 'open'   => '\'\'',
3998                                 'close'  => '\'\'',
3999                                 'sample' => wfMessage( 'italic_sample' )->text(),
4000                                 'tip'    => wfMessage( 'italic_tip' )->text(),
4001                         ],
4002                         [
4003                                 'id'     => 'mw-editbutton-link',
4004                                 'open'   => '[[',
4005                                 'close'  => ']]',
4006                                 'sample' => wfMessage( 'link_sample' )->text(),
4007                                 'tip'    => wfMessage( 'link_tip' )->text(),
4008                         ],
4009                         [
4010                                 'id'     => 'mw-editbutton-extlink',
4011                                 'open'   => '[',
4012                                 'close'  => ']',
4013                                 'sample' => wfMessage( 'extlink_sample' )->text(),
4014                                 'tip'    => wfMessage( 'extlink_tip' )->text(),
4015                         ],
4016                         [
4017                                 'id'     => 'mw-editbutton-headline',
4018                                 'open'   => "\n== ",
4019                                 'close'  => " ==\n",
4020                                 'sample' => wfMessage( 'headline_sample' )->text(),
4021                                 'tip'    => wfMessage( 'headline_tip' )->text(),
4022                         ],
4023                         $imagesAvailable ? [
4024                                 'id'     => 'mw-editbutton-image',
4025                                 'open'   => '[[' . $wgContLang->getNsText( NS_FILE ) . ':',
4026                                 'close'  => ']]',
4027                                 'sample' => wfMessage( 'image_sample' )->text(),
4028                                 'tip'    => wfMessage( 'image_tip' )->text(),
4029                         ] : false,
4030                         $imagesAvailable ? [
4031                                 'id'     => 'mw-editbutton-media',
4032                                 'open'   => '[[' . $wgContLang->getNsText( NS_MEDIA ) . ':',
4033                                 'close'  => ']]',
4034                                 'sample' => wfMessage( 'media_sample' )->text(),
4035                                 'tip'    => wfMessage( 'media_tip' )->text(),
4036                         ] : false,
4037                         [
4038                                 'id'     => 'mw-editbutton-nowiki',
4039                                 'open'   => "<nowiki>",
4040                                 'close'  => "</nowiki>",
4041                                 'sample' => wfMessage( 'nowiki_sample' )->text(),
4042                                 'tip'    => wfMessage( 'nowiki_tip' )->text(),
4043                         ],
4044                         $showSignature ? [
4045                                 'id'     => 'mw-editbutton-signature',
4046                                 'open'   => wfMessage( 'sig-text', '~~~~' )->inContentLanguage()->text(),
4047                                 'close'  => '',
4048                                 'sample' => '',
4049                                 'tip'    => wfMessage( 'sig_tip' )->text(),
4050                         ] : false,
4051                         [
4052                                 'id'     => 'mw-editbutton-hr',
4053                                 'open'   => "\n----\n",
4054                                 'close'  => '',
4055                                 'sample' => '',
4056                                 'tip'    => wfMessage( 'hr_tip' )->text(),
4057                         ]
4058                 ];
4059
4060                 $script = 'mw.loader.using("mediawiki.toolbar", function () {';
4061                 foreach ( $toolarray as $tool ) {
4062                         if ( !$tool ) {
4063                                 continue;
4064                         }
4065
4066                         $params = [
4067                                 // Images are defined in ResourceLoaderEditToolbarModule
4068                                 false,
4069                                 // Note that we use the tip both for the ALT tag and the TITLE tag of the image.
4070                                 // Older browsers show a "speedtip" type message only for ALT.
4071                                 // Ideally these should be different, realistically they
4072                                 // probably don't need to be.
4073                                 $tool['tip'],
4074                                 $tool['open'],
4075                                 $tool['close'],
4076                                 $tool['sample'],
4077                                 $tool['id'],
4078                         ];
4079
4080                         $script .= Xml::encodeJsCall(
4081                                 'mw.toolbar.addButton',
4082                                 $params,
4083                                 ResourceLoader::inDebugMode()
4084                         );
4085                 }
4086
4087                 $script .= '});';
4088                 $wgOut->addScript( ResourceLoader::makeInlineScript( $script ) );
4089
4090                 $toolbar = '<div id="toolbar"></div>';
4091
4092                 Hooks::run( 'EditPageBeforeEditToolbar', [ &$toolbar ] );
4093
4094                 return $toolbar;
4095         }
4096
4097         /**
4098          * Returns an array of html code of the following checkboxes:
4099          * minor and watch
4100          *
4101          * @param int $tabindex Current tabindex
4102          * @param array $checked Array of checkbox => bool, where bool indicates the checked
4103          *                 status of the checkbox
4104          *
4105          * @return array
4106          */
4107         public function getCheckboxes( &$tabindex, $checked ) {
4108                 global $wgUser, $wgUseMediaWikiUIEverywhere;
4109
4110                 $checkboxes = [];
4111
4112                 // don't show the minor edit checkbox if it's a new page or section
4113                 if ( !$this->isNew ) {
4114                         $checkboxes['minor'] = '';
4115                         $minorLabel = $this->context->msg( 'minoredit' )->parse();
4116                         if ( $wgUser->isAllowed( 'minoredit' ) ) {
4117                                 $attribs = [
4118                                         'tabindex' => ++$tabindex,
4119                                         'accesskey' => $this->context->msg( 'accesskey-minoredit' )->text(),
4120                                         'id' => 'wpMinoredit',
4121                                 ];
4122                                 $minorEditHtml =
4123                                         Xml::check( 'wpMinoredit', $checked['minor'], $attribs ) .
4124                                         "&#160;<label for='wpMinoredit' id='mw-editpage-minoredit'" .
4125                                         Xml::expandAttributes( [ 'title' => Linker::titleAttrib( 'minoredit', 'withaccess' ) ] ) .
4126                                         ">{$minorLabel}</label>";
4127
4128                                 if ( $wgUseMediaWikiUIEverywhere ) {
4129                                         $checkboxes['minor'] = Html::openElement( 'div', [ 'class' => 'mw-ui-checkbox' ] ) .
4130                                                 $minorEditHtml .
4131                                         Html::closeElement( 'div' );
4132                                 } else {
4133                                         $checkboxes['minor'] = $minorEditHtml;
4134                                 }
4135                         }
4136                 }
4137
4138                 $watchLabel = $this->context->msg( 'watchthis' )->parse();
4139                 $checkboxes['watch'] = '';
4140                 if ( $wgUser->isLoggedIn() ) {
4141                         $attribs = [
4142                                 'tabindex' => ++$tabindex,
4143                                 'accesskey' => $this->context->msg( 'accesskey-watch' )->text(),
4144                                 'id' => 'wpWatchthis',
4145                         ];
4146                         $watchThisHtml =
4147                                 Xml::check( 'wpWatchthis', $checked['watch'], $attribs ) .
4148                                 "&#160;<label for='wpWatchthis' id='mw-editpage-watch'" .
4149                                 Xml::expandAttributes( [ 'title' => Linker::titleAttrib( 'watch', 'withaccess' ) ] ) .
4150                                 ">{$watchLabel}</label>";
4151                         if ( $wgUseMediaWikiUIEverywhere ) {
4152                                 $checkboxes['watch'] = Html::openElement( 'div', [ 'class' => 'mw-ui-checkbox' ] ) .
4153                                         $watchThisHtml .
4154                                         Html::closeElement( 'div' );
4155                         } else {
4156                                 $checkboxes['watch'] = $watchThisHtml;
4157                         }
4158                 }
4159                 Hooks::run( 'EditPageBeforeEditChecks', [ &$this, &$checkboxes, &$tabindex ] );
4160                 return $checkboxes;
4161         }
4162
4163         /**
4164          * Returns an array of html code of the following buttons:
4165          * save, diff, preview and live
4166          *
4167          * @param int $tabindex Current tabindex
4168          *
4169          * @return array
4170          */
4171         public function getEditButtons( &$tabindex ) {
4172                 $buttons = [];
4173
4174                 $labelAsPublish =
4175                         $this->mArticle->getContext()->getConfig()->get( 'EditSubmitButtonLabelPublish' );
4176
4177                 // Can't use $this->isNew as that's also true if we're adding a new section to an extant page
4178                 if ( $labelAsPublish ) {
4179                         $buttonLabelKey = !$this->mTitle->exists() ? 'publishpage' : 'publishchanges';
4180                 } else {
4181                         $buttonLabelKey = !$this->mTitle->exists() ? 'savearticle' : 'savechanges';
4182                 }
4183                 $buttonLabel = $this->context->msg( $buttonLabelKey )->text();
4184                 $attribs = [
4185                         'id' => 'wpSave',
4186                         'name' => 'wpSave',
4187                         'tabindex' => ++$tabindex,
4188                 ] + Linker::tooltipAndAccesskeyAttribs( 'save' );
4189                 $buttons['save'] = Html::submitButton( $buttonLabel, $attribs, [ 'mw-ui-progressive' ] );
4190
4191                 ++$tabindex; // use the same for preview and live preview
4192                 $attribs = [
4193                         'id' => 'wpPreview',
4194                         'name' => 'wpPreview',
4195                         'tabindex' => $tabindex,
4196                 ] + Linker::tooltipAndAccesskeyAttribs( 'preview' );
4197                 $buttons['preview'] = Html::submitButton( $this->context->msg( 'showpreview' )->text(),
4198                         $attribs );
4199                 $buttons['live'] = '';
4200
4201                 $attribs = [
4202                         'id' => 'wpDiff',
4203                         'name' => 'wpDiff',
4204                         'tabindex' => ++$tabindex,
4205                 ] + Linker::tooltipAndAccesskeyAttribs( 'diff' );
4206                 $buttons['diff'] = Html::submitButton( $this->context->msg( 'showdiff' )->text(),
4207                         $attribs );
4208
4209                 Hooks::run( 'EditPageBeforeEditButtons', [ &$this, &$buttons, &$tabindex ] );
4210                 return $buttons;
4211         }
4212
4213         /**
4214          * Creates a basic error page which informs the user that
4215          * they have attempted to edit a nonexistent section.
4216          */
4217         function noSuchSectionPage() {
4218                 global $wgOut;
4219
4220                 $wgOut->prepareErrorPage( $this->context->msg( 'nosuchsectiontitle' ) );
4221
4222                 $res = $this->context->msg( 'nosuchsectiontext', $this->section )->parseAsBlock();
4223                 Hooks::run( 'EditPageNoSuchSection', [ &$this, &$res ] );
4224                 $wgOut->addHTML( $res );
4225
4226                 $wgOut->returnToMain( false, $this->mTitle );
4227         }
4228
4229         /**
4230          * Show "your edit contains spam" page with your diff and text
4231          *
4232          * @param string|array|bool $match Text (or array of texts) which triggered one or more filters
4233          */
4234         public function spamPageWithContent( $match = false ) {
4235                 global $wgOut, $wgLang;
4236                 $this->textbox2 = $this->textbox1;
4237
4238                 if ( is_array( $match ) ) {
4239                         $match = $wgLang->listToText( $match );
4240                 }
4241                 $wgOut->prepareErrorPage( $this->context->msg( 'spamprotectiontitle' ) );
4242
4243                 $wgOut->addHTML( '<div id="spamprotected">' );
4244                 $wgOut->addWikiMsg( 'spamprotectiontext' );
4245                 if ( $match ) {
4246                         $wgOut->addWikiMsg( 'spamprotectionmatch', wfEscapeWikiText( $match ) );
4247                 }
4248                 $wgOut->addHTML( '</div>' );
4249
4250                 $wgOut->wrapWikiMsg( '<h2>$1</h2>', "yourdiff" );
4251                 $this->showDiff();
4252
4253                 $wgOut->wrapWikiMsg( '<h2>$1</h2>', "yourtext" );
4254                 $this->showTextbox2();
4255
4256                 $wgOut->addReturnTo( $this->getContextTitle(), [ 'action' => 'edit' ] );
4257         }
4258
4259         /**
4260          * Check if the browser is on a blacklist of user-agents known to
4261          * mangle UTF-8 data on form submission. Returns true if Unicode
4262          * should make it through, false if it's known to be a problem.
4263          * @return bool
4264          */
4265         private function checkUnicodeCompliantBrowser() {
4266                 global $wgBrowserBlackList, $wgRequest;
4267
4268                 $currentbrowser = $wgRequest->getHeader( 'User-Agent' );
4269                 if ( $currentbrowser === false ) {
4270                         // No User-Agent header sent? Trust it by default...
4271                         return true;
4272                 }
4273
4274                 foreach ( $wgBrowserBlackList as $browser ) {
4275                         if ( preg_match( $browser, $currentbrowser ) ) {
4276                                 return false;
4277                         }
4278                 }
4279                 return true;
4280         }
4281
4282         /**
4283          * Filter an input field through a Unicode de-armoring process if it
4284          * came from an old browser with known broken Unicode editing issues.
4285          *
4286          * @param WebRequest $request
4287          * @param string $field
4288          * @return string
4289          */
4290         protected function safeUnicodeInput( $request, $field ) {
4291                 $text = rtrim( $request->getText( $field ) );
4292                 return $request->getBool( 'safemode' )
4293                         ? $this->unmakeSafe( $text )
4294                         : $text;
4295         }
4296
4297         /**
4298          * Filter an output field through a Unicode armoring process if it is
4299          * going to an old browser with known broken Unicode editing issues.
4300          *
4301          * @param string $text
4302          * @return string
4303          */
4304         protected function safeUnicodeOutput( $text ) {
4305                 return $this->checkUnicodeCompliantBrowser()
4306                         ? $text
4307                         : $this->makeSafe( $text );
4308         }
4309
4310         /**
4311          * A number of web browsers are known to corrupt non-ASCII characters
4312          * in a UTF-8 text editing environment. To protect against this,
4313          * detected browsers will be served an armored version of the text,
4314          * with non-ASCII chars converted to numeric HTML character references.
4315          *
4316          * Preexisting such character references will have a 0 added to them
4317          * to ensure that round-trips do not alter the original data.
4318          *
4319          * @param string $invalue
4320          * @return string
4321          */
4322         private function makeSafe( $invalue ) {
4323                 // Armor existing references for reversibility.
4324                 $invalue = strtr( $invalue, [ "&#x" => "&#x0" ] );
4325
4326                 $bytesleft = 0;
4327                 $result = "";
4328                 $working = 0;
4329                 $valueLength = strlen( $invalue );
4330                 for ( $i = 0; $i < $valueLength; $i++ ) {
4331                         $bytevalue = ord( $invalue[$i] );
4332                         if ( $bytevalue <= 0x7F ) { // 0xxx xxxx
4333                                 $result .= chr( $bytevalue );
4334                                 $bytesleft = 0;
4335                         } elseif ( $bytevalue <= 0xBF ) { // 10xx xxxx
4336                                 $working = $working << 6;
4337                                 $working += ( $bytevalue & 0x3F );
4338                                 $bytesleft--;
4339                                 if ( $bytesleft <= 0 ) {
4340                                         $result .= "&#x" . strtoupper( dechex( $working ) ) . ";";
4341                                 }
4342                         } elseif ( $bytevalue <= 0xDF ) { // 110x xxxx
4343                                 $working = $bytevalue & 0x1F;
4344                                 $bytesleft = 1;
4345                         } elseif ( $bytevalue <= 0xEF ) { // 1110 xxxx
4346                                 $working = $bytevalue & 0x0F;
4347                                 $bytesleft = 2;
4348                         } else { // 1111 0xxx
4349                                 $working = $bytevalue & 0x07;
4350                                 $bytesleft = 3;
4351                         }
4352                 }
4353                 return $result;
4354         }
4355
4356         /**
4357          * Reverse the previously applied transliteration of non-ASCII characters
4358          * back to UTF-8. Used to protect data from corruption by broken web browsers
4359          * as listed in $wgBrowserBlackList.
4360          *
4361          * @param string $invalue
4362          * @return string
4363          */
4364         private function unmakeSafe( $invalue ) {
4365                 $result = "";
4366                 $valueLength = strlen( $invalue );
4367                 for ( $i = 0; $i < $valueLength; $i++ ) {
4368                         if ( ( substr( $invalue, $i, 3 ) == "&#x" ) && ( $invalue[$i + 3] != '0' ) ) {
4369                                 $i += 3;
4370                                 $hexstring = "";
4371                                 do {
4372                                         $hexstring .= $invalue[$i];
4373                                         $i++;
4374                                 } while ( ctype_xdigit( $invalue[$i] ) && ( $i < strlen( $invalue ) ) );
4375
4376                                 // Do some sanity checks. These aren't needed for reversibility,
4377                                 // but should help keep the breakage down if the editor
4378                                 // breaks one of the entities whilst editing.
4379                                 if ( ( substr( $invalue, $i, 1 ) == ";" ) && ( strlen( $hexstring ) <= 6 ) ) {
4380                                         $codepoint = hexdec( $hexstring );
4381                                         $result .= UtfNormal\Utils::codepointToUtf8( $codepoint );
4382                                 } else {
4383                                         $result .= "&#x" . $hexstring . substr( $invalue, $i, 1 );
4384                                 }
4385                         } else {
4386                                 $result .= substr( $invalue, $i, 1 );
4387                         }
4388                 }
4389                 // reverse the transform that we made for reversibility reasons.
4390                 return strtr( $result, [ "&#x0" => "&#x" ] );
4391         }
4392 }