includes/EditPage.php

   1 <?php
   2 /**
   3  * User interface for page editing.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 /**
  24  * The edit page/HTML interface (split from Article)
  25  * The actual database and text munging is still in Article,
  26  * but it should get easier to call those from alternate
  27  * interfaces.
  28  *
  29  * EditPage cares about two distinct titles:
  30  * $this->mContextTitle is the page that forms submit to, links point to,
  31  * redirects go to, etc. $this->mTitle (as well as $mArticle) is the
  32  * page in the database that is actually being edited. These are
  33  * usually the same, but they are now allowed to be different.
  34  *
  35  * Surgeon General's Warning: prolonged exposure to this class is known to cause
  36  * headaches, which may be fatal.
  37  */
  38 class EditPage {
  39         /**
  40          * Status: Article successfully updated
  41          */
  42         const AS_SUCCESS_UPDATE = 200;
  43
  44         /**
  45          * Status: Article successfully created
  46          */
  47         const AS_SUCCESS_NEW_ARTICLE = 201;
  48
  49         /**
  50          * Status: Article update aborted by a hook function
  51          */
  52         const AS_HOOK_ERROR = 210;
  53
  54         /**
  55          * Status: A hook function returned an error
  56          */
  57         const AS_HOOK_ERROR_EXPECTED = 212;
  58
  59         /**
  60          * Status: User is blocked from editing this page
  61          */
  62         const AS_BLOCKED_PAGE_FOR_USER = 215;
  63
  64         /**
  65          * Status: Content too big (> $wgMaxArticleSize)
  66          */
  67         const AS_CONTENT_TOO_BIG = 216;
  68
  69         /**
  70          * Status: this anonymous user is not allowed to edit this page
  71          */
  72         const AS_READ_ONLY_PAGE_ANON = 218;
  73
  74         /**
  75          * Status: this logged in user is not allowed to edit this page
  76          */
  77         const AS_READ_ONLY_PAGE_LOGGED = 219;
  78
  79         /**
  80          * Status: wiki is in readonly mode (wfReadOnly() == true)
  81          */
  82         const AS_READ_ONLY_PAGE = 220;
  83
  84         /**
  85          * Status: rate limiter for action 'edit' was tripped
  86          */
  87         const AS_RATE_LIMITED = 221;
  88
  89         /**
  90          * Status: article was deleted while editing and param wpRecreate == false or form
  91          * was not posted
  92          */
  93         const AS_ARTICLE_WAS_DELETED = 222;
  94
  95         /**
  96          * Status: user tried to create this page, but is not allowed to do that
  97          * ( Title->userCan('create') == false )
  98          */
  99         const AS_NO_CREATE_PERMISSION = 223;
 100
 101         /**
 102          * Status: user tried to create a blank page and wpIgnoreBlankArticle == false
 103          */
 104         const AS_BLANK_ARTICLE = 224;
 105
 106         /**
 107          * Status: (non-resolvable) edit conflict
 108          */
 109         const AS_CONFLICT_DETECTED = 225;
 110
 111         /**
 112          * Status: no edit summary given and the user has forceeditsummary set and the user is not
 113          * editing in his own userspace or talkspace and wpIgnoreBlankSummary == false
 114          */
 115         const AS_SUMMARY_NEEDED = 226;
 116
 117         /**
 118          * Status: user tried to create a new section without content
 119          */
 120         const AS_TEXTBOX_EMPTY = 228;
 121
 122         /**
 123          * Status: article is too big (> $wgMaxArticleSize), after merging in the new section
 124          */
 125         const AS_MAX_ARTICLE_SIZE_EXCEEDED = 229;
 126
 127         /**
 128          * Status: WikiPage::doEdit() was unsuccessful
 129          */
 130         const AS_END = 231;
 131
 132         /**
 133          * Status: summary contained spam according to one of the regexes in $wgSummarySpamRegex
 134          */
 135         const AS_SPAM_ERROR = 232;
 136
 137         /**
 138          * Status: anonymous user is not allowed to upload (User::isAllowed('upload') == false)
 139          */
 140         const AS_IMAGE_REDIRECT_ANON = 233;
 141
 142         /**
 143          * Status: logged in user is not allowed to upload (User::isAllowed('upload') == false)
 144          */
 145         const AS_IMAGE_REDIRECT_LOGGED = 234;
 146
 147         /**
 148          * Status: user tried to modify the content model, but is not allowed to do that
 149          * ( User::isAllowed('editcontentmodel') == false )
 150          */
 151         const AS_NO_CHANGE_CONTENT_MODEL = 235;
 152
 153         /**
 154          * Status: user tried to create self-redirect (redirect to the same article) and
 155          * wpIgnoreSelfRedirect == false
 156          */
 157         const AS_SELF_REDIRECT = 236;
 158
 159         /**
 160          * Status: an error relating to change tagging. Look at the message key for
 161          * more details
 162          */
 163         const AS_CHANGE_TAG_ERROR = 237;
 164
 165         /**
 166          * Status: can't parse content
 167          */
 168         const AS_PARSE_ERROR = 240;
 169
 170         /**
 171          * Status: when changing the content model is disallowed due to
 172          * $wgContentHandlerUseDB being false
 173          */
 174         const AS_CANNOT_USE_CUSTOM_MODEL = 241;
 175
 176         /**
 177          * HTML id and name for the beginning of the edit form.
 178          */
 179         const EDITFORM_ID = 'editform';
 180
 181         /**
 182          * Prefix of key for cookie used to pass post-edit state.
 183          * The revision id edited is added after this
 184          */
 185         const POST_EDIT_COOKIE_KEY_PREFIX = 'PostEditRevision';
 186
 187         /**
 188          * Duration of PostEdit cookie, in seconds.
 189          * The cookie will be removed instantly if the JavaScript runs.
 190          *
 191          * Otherwise, though, we don't want the cookies to accumulate.
 192          * RFC 2109 ( https://www.ietf.org/rfc/rfc2109.txt ) specifies a possible
 193          * limit of only 20 cookies per domain. This still applies at least to some
 194          * versions of IE without full updates:
 195          * https://blogs.msdn.com/b/ieinternals/archive/2009/08/20/wininet-ie-cookie-internals-faq.aspx
 196          *
 197          * A value of 20 minutes should be enough to take into account slow loads and minor
 198          * clock skew while still avoiding cookie accumulation when JavaScript is turned off.
 199          */
 200         const POST_EDIT_COOKIE_DURATION = 1200;
 201
 202         /** @var Article */
 203         public $mArticle;
 204         /** @var WikiPage */
 205         private $page;
 206
 207         /** @var Title */
 208         public $mTitle;
 209
 210         /** @var null|Title */
 211         private $mContextTitle = null;
 212
 213         /** @var string */
 214         public $action = 'submit';
 215
 216         /** @var bool */
 217         public $isConflict = false;
 218
 219         /** @var bool */
 220         public $isCssJsSubpage = false;
 221
 222         /** @var bool */
 223         public $isCssSubpage = false;
 224
 225         /** @var bool */
 226         public $isJsSubpage = false;
 227
 228         /** @var bool */
 229         public $isWrongCaseCssJsPage = false;
 230
 231         /** @var bool New page or new section */
 232         public $isNew = false;
 233
 234         /** @var bool */
 235         public $deletedSinceEdit;
 236
 237         /** @var string */
 238         public $formtype;
 239
 240         /** @var bool */
 241         public $firsttime;
 242
 243         /** @var bool|stdClass */
 244         public $lastDelete;
 245
 246         /** @var bool */
 247         public $mTokenOk = false;
 248
 249         /** @var bool */
 250         public $mTokenOkExceptSuffix = false;
 251
 252         /** @var bool */
 253         public $mTriedSave = false;
 254
 255         /** @var bool */
 256         public $incompleteForm = false;
 257
 258         /** @var bool */
 259         public $tooBig = false;
 260
 261         /** @var bool */
 262         public $kblength = false;
 263
 264         /** @var bool */
 265         public $missingComment = false;
 266
 267         /** @var bool */
 268         public $missingSummary = false;
 269
 270         /** @var bool */
 271         public $allowBlankSummary = false;
 272
 273         /** @var bool */
 274         protected $blankArticle = false;
 275
 276         /** @var bool */
 277         protected $allowBlankArticle = false;
 278
 279         /** @var bool */
 280         protected $selfRedirect = false;
 281
 282         /** @var bool */
 283         protected $allowSelfRedirect = false;
 284
 285         /** @var string */
 286         public $autoSumm = '';
 287
 288         /** @var string */
 289         public $hookError = '';
 290
 291         /** @var ParserOutput */
 292         public $mParserOutput;
 293
 294         /** @var bool Has a summary been preset using GET parameter &summary= ? */
 295         public $hasPresetSummary = false;
 296
 297         /** @var bool */
 298         public $mBaseRevision = false;
 299
 300         /** @var bool */
 301         public $mShowSummaryField = true;
 302
 303         # Form values
 304
 305         /** @var bool */
 306         public $save = false;
 307
 308         /** @var bool */
 309         public $preview = false;
 310
 311         /** @var bool */
 312         public $diff = false;
 313
 314         /** @var bool */
 315         public $minoredit = false;
 316
 317         /** @var bool */
 318         public $watchthis = false;
 319
 320         /** @var bool */
 321         public $recreate = false;
 322
 323         /** @var string */
 324         public $textbox1 = '';
 325
 326         /** @var string */
 327         public $textbox2 = '';
 328
 329         /** @var string */
 330         public $summary = '';
 331
 332         /** @var bool */
 333         public $nosummary = false;
 334
 335         /** @var string */
 336         public $edittime = '';
 337
 338         /** @var 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         /**
 398          * @var bool Set in ApiEditPage, based on ContentHandler::allowsDirectApiEditing
 399          */
 400         private $enableApiEditOverride = false;
 401
 402         /**
 403          * @param Article $article
 404          */
 405         public function __construct( Article $article ) {
 406                 $this->mArticle = $article;
 407                 $this->page = $article->getPage(); // model object
 408                 $this->mTitle = $article->getTitle();
 409
 410                 $this->contentModel = $this->mTitle->getContentModel();
 411
 412                 $handler = ContentHandler::getForModelID( $this->contentModel );
 413                 $this->contentFormat = $handler->getDefaultFormat();
 414         }
 415
 416         /**
 417          * @return Article
 418          */
 419         public function getArticle() {
 420                 return $this->mArticle;
 421         }
 422
 423         /**
 424          * @since 1.19
 425          * @return Title
 426          */
 427         public function getTitle() {
 428                 return $this->mTitle;
 429         }
 430
 431         /**
 432          * Set the context Title object
 433          *
 434          * @param Title|null $title Title object or null
 435          */
 436         public function setContextTitle( $title ) {
 437                 $this->mContextTitle = $title;
 438         }
 439
 440         /**
 441          * Get the context title object.
 442          * If not set, $wgTitle will be returned. This behavior might change in
 443          * the future to return $this->mTitle instead.
 444          *
 445          * @return Title
 446          */
 447         public function getContextTitle() {
 448                 if ( is_null( $this->mContextTitle ) ) {
 449                         global $wgTitle;
 450                         return $wgTitle;
 451                 } else {
 452                         return $this->mContextTitle;
 453                 }
 454         }
 455
 456         /**
 457          * Returns if the given content model is editable.
 458          *
 459          * @param string $modelId The ID of the content model to test. Use CONTENT_MODEL_XXX constants.
 460          * @return bool
 461          * @throws MWException If $modelId has no known handler
 462          */
 463         public function isSupportedContentModel( $modelId ) {
 464                 return $this->enableApiEditOverride === true ||
 465                         ContentHandler::getForModelID( $modelId )->supportsDirectEditing();
 466         }
 467
 468         /**
 469          * Allow editing of content that supports API direct editing, but not general
 470          * direct editing. Set to false by default.
 471          *
 472          * @param bool $enableOverride
 473          */
 474         public function setApiEditOverride( $enableOverride ) {
 475                 $this->enableApiEditOverride = $enableOverride;
 476         }
 477
 478         function submit() {
 479                 $this->edit();
 480         }
 481
 482         /**
 483          * This is the function that gets called for "action=edit". It
 484          * sets up various member variables, then passes execution to
 485          * another function, usually showEditForm()
 486          *
 487          * The edit form is self-submitting, so that when things like
 488          * preview and edit conflicts occur, we get the same form back
 489          * with the extra stuff added.  Only when the final submission
 490          * is made and all is well do we actually save and redirect to
 491          * the newly-edited page.
 492          */
 493         function edit() {
 494                 global $wgOut, $wgRequest, $wgUser;
 495                 // Allow extensions to modify/prevent this form or submission
 496                 if ( !Hooks::run( 'AlternateEdit', [ $this ] ) ) {
 497                         return;
 498                 }
 499
 500                 wfDebug( __METHOD__ . ": enter\n" );
 501
 502                 // If they used redlink=1 and the page exists, redirect to the main article
 503                 if ( $wgRequest->getBool( 'redlink' ) && $this->mTitle->exists() ) {
 504                         $wgOut->redirect( $this->mTitle->getFullURL() );
 505                         return;
 506                 }
 507
 508                 $this->importFormData( $wgRequest );
 509                 $this->firsttime = false;
 510
 511                 if ( wfReadOnly() && $this->save ) {
 512                         // Force preview
 513                         $this->save = false;
 514                         $this->preview = true;
 515                 }
 516
 517                 if ( $this->save ) {
 518                         $this->formtype = 'save';
 519                 } elseif ( $this->preview ) {
 520                         $this->formtype = 'preview';
 521                 } elseif ( $this->diff ) {
 522                         $this->formtype = 'diff';
 523                 } else { # First time through
 524                         $this->firsttime = true;
 525                         if ( $this->previewOnOpen() ) {
 526                                 $this->formtype = 'preview';
 527                         } else {
 528                                 $this->formtype = 'initial';
 529                         }
 530                 }
 531
 532                 $permErrors = $this->getEditPermissionErrors( $this->save ? 'secure' : 'full' );
 533                 if ( $permErrors ) {
 534                         wfDebug( __METHOD__ . ": User can't edit\n" );
 535                         // Auto-block user's IP if the account was "hard" blocked
 536                         if ( !wfReadOnly() ) {
 537                                 $user = $wgUser;
 538                                 DeferredUpdates::addCallableUpdate( function () use ( $user ) {
 539                                         $user->spreadAnyEditBlock();
 540                                 } );
 541                         }
 542                         $this->displayPermissionsError( $permErrors );
 543
 544                         return;
 545                 }
 546
 547                 $revision = $this->mArticle->getRevisionFetched();
 548                 // Disallow editing revisions with content models different from the current one
 549                 if ( $revision && $revision->getContentModel() !== $this->contentModel ) {
 550                         $this->displayViewSourcePage(
 551                                 $this->getContentObject(),
 552                                 wfMessage(
 553                                         'contentmodelediterror',
 554                                         $revision->getContentModel(),
 555                                         $this->contentModel
 556                                 )->plain()
 557                         );
 558                         return;
 559                 }
 560
 561                 $this->isConflict = false;
 562                 // css / js subpages of user pages get a special treatment
 563                 $this->isCssJsSubpage = $this->mTitle->isCssJsSubpage();
 564                 $this->isCssSubpage = $this->mTitle->isCssSubpage();
 565                 $this->isJsSubpage = $this->mTitle->isJsSubpage();
 566                 // @todo FIXME: Silly assignment.
 567                 $this->isWrongCaseCssJsPage = $this->isWrongCaseCssJsPage();
 568
 569                 # Show applicable editing introductions
 570                 if ( $this->formtype == 'initial' || $this->firsttime ) {
 571                         $this->showIntro();
 572                 }
 573
 574                 # Attempt submission here.  This will check for edit conflicts,
 575                 # and redundantly check for locked database, blocked IPs, etc.
 576                 # that edit() already checked just in case someone tries to sneak
 577                 # in the back door with a hand-edited submission URL.
 578
 579                 if ( 'save' == $this->formtype ) {
 580                         $resultDetails = null;
 581                         $status = $this->attemptSave( $resultDetails );
 582                         if ( !$this->handleStatus( $status, $resultDetails ) ) {
 583                                 return;
 584                         }
 585                 }
 586
 587                 # First time through: get contents, set time for conflict
 588                 # checking, etc.
 589                 if ( 'initial' == $this->formtype || $this->firsttime ) {
 590                         if ( $this->initialiseForm() === false ) {
 591                                 $this->noSuchSectionPage();
 592                                 return;
 593                         }
 594
 595                         if ( !$this->mTitle->getArticleID() ) {
 596                                 Hooks::run( 'EditFormPreloadText', [ &$this->textbox1, &$this->mTitle ] );
 597                         } else {
 598                                 Hooks::run( 'EditFormInitialText', [ $this ] );
 599                         }
 600
 601                 }
 602
 603                 $this->showEditForm();
 604         }
 605
 606         /**
 607          * @param string $rigor Same format as Title::getUserPermissionErrors()
 608          * @return array
 609          */
 610         protected function getEditPermissionErrors( $rigor = 'secure' ) {
 611                 global $wgUser;
 612
 613                 $permErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser, $rigor );
 614                 # Can this title be created?
 615                 if ( !$this->mTitle->exists() ) {
 616                         $permErrors = array_merge(
 617                                 $permErrors,
 618                                 wfArrayDiff2(
 619                                         $this->mTitle->getUserPermissionsErrors( 'create', $wgUser, $rigor ),
 620                                         $permErrors
 621                                 )
 622                         );
 623                 }
 624                 # Ignore some permissions errors when a user is just previewing/viewing diffs
 625                 $remove = [];
 626                 foreach ( $permErrors as $error ) {
 627                         if ( ( $this->preview || $this->diff )
 628                                 && ( $error[0] == 'blockedtext' || $error[0] == 'autoblockedtext' )
 629                         ) {
 630                                 $remove[] = $error;
 631                         }
 632                 }
 633                 $permErrors = wfArrayDiff2( $permErrors, $remove );
 634
 635                 return $permErrors;
 636         }
 637
 638         /**
 639          * Display a permissions error page, like OutputPage::showPermissionsErrorPage(),
 640          * but with the following differences:
 641          * - If redlink=1, the user will be redirected to the page
 642          * - If there is content to display or the error occurs while either saving,
 643          *   previewing or showing the difference, it will be a
 644          *   "View source for ..." page displaying the source code after the error message.
 645          *
 646          * @since 1.19
 647          * @param array $permErrors Array of permissions errors, as returned by
 648          *    Title::getUserPermissionsErrors().
 649          * @throws PermissionsError
 650          */
 651         protected function displayPermissionsError( array $permErrors ) {
 652                 global $wgRequest, $wgOut;
 653
 654                 if ( $wgRequest->getBool( 'redlink' ) ) {
 655                         // The edit page was reached via a red link.
 656                         // Redirect to the article page and let them click the edit tab if
 657                         // they really want a permission error.
 658                         $wgOut->redirect( $this->mTitle->getFullURL() );
 659                         return;
 660                 }
 661
 662                 $content = $this->getContentObject();
 663
 664                 # Use the normal message if there's nothing to display
 665                 if ( $this->firsttime && ( !$content || $content->isEmpty() ) ) {
 666                         $action = $this->mTitle->exists() ? 'edit' :
 667                                 ( $this->mTitle->isTalkPage() ? 'createtalk' : 'createpage' );
 668                         throw new PermissionsError( $action, $permErrors );
 669                 }
 670
 671                 $this->displayViewSourcePage(
 672                         $content,
 673                         $wgOut->formatPermissionsErrorMessage( $permErrors, 'edit' )
 674                 );
 675         }
 676
 677         /**
 678          * Display a read-only View Source page
 679          * @param Content $content content object
 680          * @param string $errorMessage additional wikitext error message to display
 681          */
 682         protected function displayViewSourcePage( Content $content, $errorMessage = '' ) {
 683                 global $wgOut;
 684
 685                 Hooks::run( 'EditPage::showReadOnlyForm:initial', [ $this, &$wgOut ] );
 686
 687                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
 688                 $wgOut->setPageTitle( wfMessage(
 689                         'viewsource-title',
 690                         $this->getContextTitle()->getPrefixedText()
 691                 ) );
 692                 $wgOut->addBacklinkSubtitle( $this->getContextTitle() );
 693                 $wgOut->addHTML( $this->editFormPageTop );
 694                 $wgOut->addHTML( $this->editFormTextTop );
 695
 696                 if ( $errorMessage !== '' ) {
 697                         $wgOut->addWikiText( $errorMessage );
 698                         $wgOut->addHTML( "<hr />\n" );
 699                 }
 700
 701                 # If the user made changes, preserve them when showing the markup
 702                 # (This happens when a user is blocked during edit, for instance)
 703                 if ( !$this->firsttime ) {
 704                         $text = $this->textbox1;
 705                         $wgOut->addWikiMsg( 'viewyourtext' );
 706                 } else {
 707                         try {
 708                                 $text = $this->toEditText( $content );
 709                         } catch ( MWException $e ) {
 710                                 # Serialize using the default format if the content model is not supported
 711                                 # (e.g. for an old revision with a different model)
 712                                 $text = $content->serialize();
 713                         }
 714                         $wgOut->addWikiMsg( 'viewsourcetext' );
 715                 }
 716
 717                 $wgOut->addHTML( $this->editFormTextBeforeContent );
 718                 $this->showTextbox( $text, 'wpTextbox1', [ 'readonly' ] );
 719                 $wgOut->addHTML( $this->editFormTextAfterContent );
 720
 721                 $wgOut->addHTML( Html::rawElement( 'div', [ 'class' => 'templatesUsed' ],
 722                         Linker::formatTemplates( $this->getTemplates() ) ) );
 723
 724                 $wgOut->addModules( 'mediawiki.action.edit.collapsibleFooter' );
 725
 726                 $wgOut->addHTML( $this->editFormTextBottom );
 727                 if ( $this->mTitle->exists() ) {
 728                         $wgOut->returnToMain( null, $this->mTitle );
 729                 }
 730         }
 731
 732         /**
 733          * Should we show a preview when the edit form is first shown?
 734          *
 735          * @return bool
 736          */
 737         protected function previewOnOpen() {
 738                 global $wgRequest, $wgUser, $wgPreviewOnOpenNamespaces;
 739                 if ( $wgRequest->getVal( 'preview' ) == 'yes' ) {
 740                         // Explicit override from request
 741                         return true;
 742                 } elseif ( $wgRequest->getVal( 'preview' ) == 'no' ) {
 743                         // Explicit override from request
 744                         return false;
 745                 } elseif ( $this->section == 'new' ) {
 746                         // Nothing *to* preview for new sections
 747                         return false;
 748                 } elseif ( ( $wgRequest->getVal( 'preload' ) !== null || $this->mTitle->exists() )
 749                         && $wgUser->getOption( 'previewonfirst' )
 750                 ) {
 751                         // Standard preference behavior
 752                         return true;
 753                 } elseif ( !$this->mTitle->exists()
 754                         && isset( $wgPreviewOnOpenNamespaces[$this->mTitle->getNamespace()] )
 755                         && $wgPreviewOnOpenNamespaces[$this->mTitle->getNamespace()]
 756                 ) {
 757                         // Categories are special
 758                         return true;
 759                 } else {
 760                         return false;
 761                 }
 762         }
 763
 764         /**
 765          * Checks whether the user entered a skin name in uppercase,
 766          * e.g. "User:Example/Monobook.css" instead of "monobook.css"
 767          *
 768          * @return bool
 769          */
 770         protected function isWrongCaseCssJsPage() {
 771                 if ( $this->mTitle->isCssJsSubpage() ) {
 772                         $name = $this->mTitle->getSkinFromCssJsSubpage();
 773                         $skins = array_merge(
 774                                 array_keys( Skin::getSkinNames() ),
 775                                 [ 'common' ]
 776                         );
 777                         return !in_array( $name, $skins )
 778                                 && in_array( strtolower( $name ), $skins );
 779                 } else {
 780                         return false;
 781                 }
 782         }
 783
 784         /**
 785          * Returns whether section editing is supported for the current page.
 786          * Subclasses may override this to replace the default behavior, which is
 787          * to check ContentHandler::supportsSections.
 788          *
 789          * @return bool True if this edit page supports sections, false otherwise.
 790          */
 791         protected function isSectionEditSupported() {
 792                 $contentHandler = ContentHandler::getForTitle( $this->mTitle );
 793                 return $contentHandler->supportsSections();
 794         }
 795
 796         /**
 797          * This function collects the form data and uses it to populate various member variables.
 798          * @param WebRequest $request
 799          * @throws ErrorPageError
 800          */
 801         function importFormData( &$request ) {
 802                 global $wgContLang, $wgUser;
 803
 804                 # Section edit can come from either the form or a link
 805                 $this->section = $request->getVal( 'wpSection', $request->getVal( 'section' ) );
 806
 807                 if ( $this->section !== null && $this->section !== '' && !$this->isSectionEditSupported() ) {
 808                         throw new ErrorPageError( 'sectioneditnotsupported-title', 'sectioneditnotsupported-text' );
 809                 }
 810
 811                 $this->isNew = !$this->mTitle->exists() || $this->section == 'new';
 812
 813                 if ( $request->wasPosted() ) {
 814                         # These fields need to be checked for encoding.
 815                         # Also remove trailing whitespace, but don't remove _initial_
 816                         # whitespace from the text boxes. This may be significant formatting.
 817                         $this->textbox1 = $this->safeUnicodeInput( $request, 'wpTextbox1' );
 818                         if ( !$request->getCheck( 'wpTextbox2' ) ) {
 819                                 // Skip this if wpTextbox2 has input, it indicates that we came
 820                                 // from a conflict page with raw page text, not a custom form
 821                                 // modified by subclasses
 822                                 $textbox1 = $this->importContentFormData( $request );
 823                                 if ( $textbox1 !== null ) {
 824                                         $this->textbox1 = $textbox1;
 825                                 }
 826                         }
 827
 828                         # Truncate for whole multibyte characters
 829                         $this->summary = $wgContLang->truncate( $request->getText( 'wpSummary' ), 255 );
 830
 831                         # If the summary consists of a heading, e.g. '==Foobar==', extract the title from the
 832                         # header syntax, e.g. 'Foobar'. This is mainly an issue when we are using wpSummary for
 833                         # section titles.
 834                         $this->summary = preg_replace( '/^\s*=+\s*(.*?)\s*=+\s*$/', '$1', $this->summary );
 835
 836                         # Treat sectiontitle the same way as summary.
 837                         # Note that wpSectionTitle is not yet a part of the actual edit form, as wpSummary is
 838                         # currently doing double duty as both edit summary and section title. Right now this
 839                         # is just to allow API edits to work around this limitation, but this should be
 840                         # incorporated into the actual edit form when EditPage is rewritten (Bugs 18654, 26312).
 841                         $this->sectiontitle = $wgContLang->truncate( $request->getText( 'wpSectionTitle' ), 255 );
 842                         $this->sectiontitle = preg_replace( '/^\s*=+\s*(.*?)\s*=+\s*$/', '$1', $this->sectiontitle );
 843
 844                         $this->edittime = $request->getVal( 'wpEdittime' );
 845                         $this->editRevId = $request->getIntOrNull( 'editRevId' );
 846                         $this->starttime = $request->getVal( 'wpStarttime' );
 847
 848                         $undidRev = $request->getInt( 'wpUndidRevision' );
 849                         if ( $undidRev ) {
 850                                 $this->undidRev = $undidRev;
 851                         }
 852
 853                         $this->scrolltop = $request->getIntOrNull( 'wpScrolltop' );
 854
 855                         if ( $this->textbox1 === '' && $request->getVal( 'wpTextbox1' ) === null ) {
 856                                 // wpTextbox1 field is missing, possibly due to being "too big"
 857                                 // according to some filter rules such as Suhosin's setting for
 858                                 // suhosin.request.max_value_length (d'oh)
 859                                 $this->incompleteForm = true;
 860                         } else {
 861                                 // If we receive the last parameter of the request, we can fairly
 862                                 // claim the POST request has not been truncated.
 863
 864                                 // TODO: softened the check for cutover.  Once we determine
 865                                 // that it is safe, we should complete the transition by
 866                                 // removing the "edittime" clause.
 867                                 $this->incompleteForm = ( !$request->getVal( 'wpUltimateParam' )
 868                                         && is_null( $this->edittime ) );
 869                         }
 870                         if ( $this->incompleteForm ) {
 871                                 # If the form is incomplete, force to preview.
 872                                 wfDebug( __METHOD__ . ": Form data appears to be incomplete\n" );
 873                                 wfDebug( "POST DATA: " . var_export( $_POST, true ) . "\n" );
 874                                 $this->preview = true;
 875                         } else {
 876                                 $this->preview = $request->getCheck( 'wpPreview' );
 877                                 $this->diff = $request->getCheck( 'wpDiff' );
 878
 879                                 // Remember whether a save was requested, so we can indicate
 880                                 // if we forced preview due to session failure.
 881                                 $this->mTriedSave = !$this->preview;
 882
 883                                 if ( $this->tokenOk( $request ) ) {
 884                                         # Some browsers will not report any submit button
 885                                         # if the user hits enter in the comment box.
 886                                         # The unmarked state will be assumed to be a save,
 887                                         # if the form seems otherwise complete.
 888                                         wfDebug( __METHOD__ . ": Passed token check.\n" );
 889                                 } elseif ( $this->diff ) {
 890                                         # Failed token check, but only requested "Show Changes".
 891                                         wfDebug( __METHOD__ . ": Failed token check; Show Changes requested.\n" );
 892                                 } else {
 893                                         # Page might be a hack attempt posted from
 894                                         # an external site. Preview instead of saving.
 895                                         wfDebug( __METHOD__ . ": Failed token check; forcing preview\n" );
 896                                         $this->preview = true;
 897                                 }
 898                         }
 899                         $this->save = !$this->preview && !$this->diff;
 900                         if ( !preg_match( '/^\d{14}$/', $this->edittime ) ) {
 901                                 $this->edittime = null;
 902                         }
 903
 904                         if ( !preg_match( '/^\d{14}$/', $this->starttime ) ) {
 905                                 $this->starttime = null;
 906                         }
 907
 908                         $this->recreate = $request->getCheck( 'wpRecreate' );
 909
 910                         $this->minoredit = $request->getCheck( 'wpMinoredit' );
 911                         $this->watchthis = $request->getCheck( 'wpWatchthis' );
 912
 913                         # Don't force edit summaries when a user is editing their own user or talk page
 914                         if ( ( $this->mTitle->mNamespace == NS_USER || $this->mTitle->mNamespace == NS_USER_TALK )
 915                                 && $this->mTitle->getText() == $wgUser->getName()
 916                         ) {
 917                                 $this->allowBlankSummary = true;
 918                         } else {
 919                                 $this->allowBlankSummary = $request->getBool( 'wpIgnoreBlankSummary' )
 920                                         || !$wgUser->getOption( 'forceeditsummary' );
 921                         }
 922
 923                         $this->autoSumm = $request->getText( 'wpAutoSummary' );
 924
 925                         $this->allowBlankArticle = $request->getBool( 'wpIgnoreBlankArticle' );
 926                         $this->allowSelfRedirect = $request->getBool( 'wpIgnoreSelfRedirect' );
 927
 928                         $changeTags = $request->getVal( 'wpChangeTags' );
 929                         if ( is_null( $changeTags ) || $changeTags === '' ) {
 930                                 $this->changeTags = [];
 931                         } else {
 932                                 $this->changeTags = array_filter( array_map( 'trim', explode( ',',
 933                                         $changeTags ) ) );
 934                         }
 935                 } else {
 936                         # Not a posted form? Start with nothing.
 937                         wfDebug( __METHOD__ . ": Not a posted form.\n" );
 938                         $this->textbox1 = '';
 939                         $this->summary = '';
 940                         $this->sectiontitle = '';
 941                         $this->edittime = '';
 942                         $this->editRevId = null;
 943                         $this->starttime = wfTimestampNow();
 944                         $this->edit = false;
 945                         $this->preview = false;
 946                         $this->save = false;
 947                         $this->diff = false;
 948                         $this->minoredit = false;
 949                         // Watch may be overridden by request parameters
 950                         $this->watchthis = $request->getBool( 'watchthis', false );
 951                         $this->recreate = false;
 952
 953                         // When creating a new section, we can preload a section title by passing it as the
 954                         // preloadtitle parameter in the URL (Bug 13100)
 955                         if ( $this->section == 'new' && $request->getVal( 'preloadtitle' ) ) {
 956                                 $this->sectiontitle = $request->getVal( 'preloadtitle' );
 957                                 // Once wpSummary isn't being use for setting section titles, we should delete this.
 958                                 $this->summary = $request->getVal( 'preloadtitle' );
 959                         } elseif ( $this->section != 'new' && $request->getVal( 'summary' ) ) {
 960                                 $this->summary = $request->getText( 'summary' );
 961                                 if ( $this->summary !== '' ) {
 962                                         $this->hasPresetSummary = true;
 963                                 }
 964                         }
 965
 966                         if ( $request->getVal( 'minor' ) ) {
 967                                 $this->minoredit = true;
 968                         }
 969                 }
 970
 971                 $this->oldid = $request->getInt( 'oldid' );
 972                 $this->parentRevId = $request->getInt( 'parentRevId' );
 973
 974                 $this->bot = $request->getBool( 'bot', true );
 975                 $this->nosummary = $request->getBool( 'nosummary' );
 976
 977                 // May be overridden by revision.
 978                 $this->contentModel = $request->getText( 'model', $this->contentModel );
 979                 // May be overridden by revision.
 980                 $this->contentFormat = $request->getText( 'format', $this->contentFormat );
 981
 982                 if ( !ContentHandler::getForModelID( $this->contentModel )
 983                         ->isSupportedFormat( $this->contentFormat )
 984                 ) {
 985                         throw new ErrorPageError(
 986                                 'editpage-notsupportedcontentformat-title',
 987                                 'editpage-notsupportedcontentformat-text',
 988                                 [ $this->contentFormat, ContentHandler::getLocalizedName( $this->contentModel ) ]
 989                         );
 990                 }
 991
 992                 /**
 993                  * @todo Check if the desired model is allowed in this namespace, and if
 994                  *   a transition from the page's current model to the new model is
 995                  *   allowed.
 996                  */
 997
 998                 $this->editintro = $request->getText( 'editintro',
 999                         // Custom edit intro for new sections
1000                         $this->section === 'new' ? 'MediaWiki:addsection-editintro' : '' );
1001
1002                 // Allow extensions to modify form data
1003                 Hooks::run( 'EditPage::importFormData', [ $this, $request ] );
1004
1005         }
1006
1007         /**
1008          * Subpage overridable method for extracting the page content data from the
1009          * posted form to be placed in $this->textbox1, if using customized input
1010          * this method should be overridden and return the page text that will be used
1011          * for saving, preview parsing and so on...
1012          *
1013          * @param WebRequest $request
1014          * @return string|null
1015          */
1016         protected function importContentFormData( &$request ) {
1017                 return; // Don't do anything, EditPage already extracted wpTextbox1
1018         }
1019
1020         /**
1021          * Initialise form fields in the object
1022          * Called on the first invocation, e.g. when a user clicks an edit link
1023          * @return bool If the requested section is valid
1024          */
1025         function initialiseForm() {
1026                 global $wgUser;
1027                 $this->edittime = $this->page->getTimestamp();
1028                 $this->editRevId = $this->page->getLatest();
1029
1030                 $content = $this->getContentObject( false ); # TODO: track content object?!
1031                 if ( $content === false ) {
1032                         return false;
1033                 }
1034                 $this->textbox1 = $this->toEditText( $content );
1035
1036                 // activate checkboxes if user wants them to be always active
1037                 # Sort out the "watch" checkbox
1038                 if ( $wgUser->getOption( 'watchdefault' ) ) {
1039                         # Watch all edits
1040                         $this->watchthis = true;
1041                 } elseif ( $wgUser->getOption( 'watchcreations' ) && !$this->mTitle->exists() ) {
1042                         # Watch creations
1043                         $this->watchthis = true;
1044                 } elseif ( $wgUser->isWatched( $this->mTitle ) ) {
1045                         # Already watched
1046                         $this->watchthis = true;
1047                 }
1048                 if ( $wgUser->getOption( 'minordefault' ) && !$this->isNew ) {
1049                         $this->minoredit = true;
1050                 }
1051                 if ( $this->textbox1 === false ) {
1052                         return false;
1053                 }
1054                 return true;
1055         }
1056
1057         /**
1058          * @param Content|null $def_content The default value to return
1059          *
1060          * @return Content|null Content on success, $def_content for invalid sections
1061          *
1062          * @since 1.21
1063          */
1064         protected function getContentObject( $def_content = null ) {
1065                 global $wgOut, $wgRequest, $wgUser, $wgContLang;
1066
1067                 $content = false;
1068
1069                 // For message page not locally set, use the i18n message.
1070                 // For other non-existent articles, use preload text if any.
1071                 if ( !$this->mTitle->exists() || $this->section == 'new' ) {
1072                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI && $this->section != 'new' ) {
1073                                 # If this is a system message, get the default text.
1074                                 $msg = $this->mTitle->getDefaultMessageText();
1075
1076                                 $content = $this->toEditContent( $msg );
1077                         }
1078                         if ( $content === false ) {
1079                                 # If requested, preload some text.
1080                                 $preload = $wgRequest->getVal( 'preload',
1081                                         // Custom preload text for new sections
1082                                         $this->section === 'new' ? 'MediaWiki:addsection-preload' : '' );
1083                                 $params = $wgRequest->getArray( 'preloadparams', [] );
1084
1085                                 $content = $this->getPreloadedContent( $preload, $params );
1086                         }
1087                 // For existing pages, get text based on "undo" or section parameters.
1088                 } else {
1089                         if ( $this->section != '' ) {
1090                                 // Get section edit text (returns $def_text for invalid sections)
1091                                 $orig = $this->getOriginalContent( $wgUser );
1092                                 $content = $orig ? $orig->getSection( $this->section ) : null;
1093
1094                                 if ( !$content ) {
1095                                         $content = $def_content;
1096                                 }
1097                         } else {
1098                                 $undoafter = $wgRequest->getInt( 'undoafter' );
1099                                 $undo = $wgRequest->getInt( 'undo' );
1100
1101                                 if ( $undo > 0 && $undoafter > 0 ) {
1102                                         $undorev = Revision::newFromId( $undo );
1103                                         $oldrev = Revision::newFromId( $undoafter );
1104
1105                                         # Sanity check, make sure it's the right page,
1106                                         # the revisions exist and they were not deleted.
1107                                         # Otherwise, $content will be left as-is.
1108                                         if ( !is_null( $undorev ) && !is_null( $oldrev ) &&
1109                                                 !$undorev->isDeleted( Revision::DELETED_TEXT ) &&
1110                                                 !$oldrev->isDeleted( Revision::DELETED_TEXT )
1111                                         ) {
1112                                                 $content = $this->page->getUndoContent( $undorev, $oldrev );
1113
1114                                                 if ( $content === false ) {
1115                                                         # Warn the user that something went wrong
1116                                                         $undoMsg = 'failure';
1117                                                 } else {
1118                                                         $oldContent = $this->page->getContent( Revision::RAW );
1119                                                         $popts = ParserOptions::newFromUserAndLang( $wgUser, $wgContLang );
1120                                                         $newContent = $content->preSaveTransform( $this->mTitle, $wgUser, $popts );
1121
1122                                                         if ( $newContent->equals( $oldContent ) ) {
1123                                                                 # Tell the user that the undo results in no change,
1124                                                                 # i.e. the revisions were already undone.
1125                                                                 $undoMsg = 'nochange';
1126                                                                 $content = false;
1127                                                         } else {
1128                                                                 # Inform the user of our success and set an automatic edit summary
1129                                                                 $undoMsg = 'success';
1130
1131                                                                 # If we just undid one rev, use an autosummary
1132                                                                 $firstrev = $oldrev->getNext();
1133                                                                 if ( $firstrev && $firstrev->getId() == $undo ) {
1134                                                                         $userText = $undorev->getUserText();
1135                                                                         if ( $userText === '' ) {
1136                                                                                 $undoSummary = wfMessage(
1137                                                                                         'undo-summary-username-hidden',
1138                                                                                         $undo
1139                                                                                 )->inContentLanguage()->text();
1140                                                                         } else {
1141                                                                                 $undoSummary = wfMessage(
1142                                                                                         'undo-summary',
1143                                                                                         $undo,
1144                                                                                         $userText
1145                                                                                 )->inContentLanguage()->text();
1146                                                                         }
1147                                                                         if ( $this->summary === '' ) {
1148                                                                                 $this->summary = $undoSummary;
1149                                                                         } else {
1150                                                                                 $this->summary = $undoSummary . wfMessage( 'colon-separator' )
1151                                                                                         ->inContentLanguage()->text() . $this->summary;
1152                                                                         }
1153                                                                         $this->undidRev = $undo;
1154                                                                 }
1155                                                                 $this->formtype = 'diff';
1156                                                         }
1157                                                 }
1158                                         } else {
1159                                                 // Failed basic sanity checks.
1160                                                 // Older revisions may have been removed since the link
1161                                                 // was created, or we may simply have got bogus input.
1162                                                 $undoMsg = 'norev';
1163                                         }
1164
1165                                         // Messages: undo-success, undo-failure, undo-norev, undo-nochange
1166                                         $class = ( $undoMsg == 'success' ? '' : 'error ' ) . "mw-undo-{$undoMsg}";
1167                                         $this->editFormPageTop .= $wgOut->parse( "<div class=\"{$class}\">" .
1168                                                 wfMessage( 'undo-' . $undoMsg )->plain() . '</div>', true, /* interface */true );
1169                                 }
1170
1171                                 if ( $content === false ) {
1172                                         $content = $this->getOriginalContent( $wgUser );
1173                                 }
1174                         }
1175                 }
1176
1177                 return $content;
1178         }
1179
1180         /**
1181          * Get the content of the wanted revision, without section extraction.
1182          *
1183          * The result of this function can be used to compare user's input with
1184          * section replaced in its context (using WikiPage::replaceSectionAtRev())
1185          * to the original text of the edit.
1186          *
1187          * This differs from Article::getContent() that when a missing revision is
1188          * encountered the result will be null and not the
1189          * 'missing-revision' message.
1190          *
1191          * @since 1.19
1192          * @param User $user The user to get the revision for
1193          * @return Content|null
1194          */
1195         private function getOriginalContent( User $user ) {
1196                 if ( $this->section == 'new' ) {
1197                         return $this->getCurrentContent();
1198                 }
1199                 $revision = $this->mArticle->getRevisionFetched();
1200                 if ( $revision === null ) {
1201                         if ( !$this->contentModel ) {
1202                                 $this->contentModel = $this->getTitle()->getContentModel();
1203                         }
1204                         $handler = ContentHandler::getForModelID( $this->contentModel );
1205
1206                         return $handler->makeEmptyContent();
1207                 }
1208                 $content = $revision->getContent( Revision::FOR_THIS_USER, $user );
1209                 return $content;
1210         }
1211
1212         /**
1213          * Get the edit's parent revision ID
1214          *
1215          * The "parent" revision is the ancestor that should be recorded in this
1216          * page's revision history.  It is either the revision ID of the in-memory
1217          * article content, or in the case of a 3-way merge in order to rebase
1218          * across a recoverable edit conflict, the ID of the newer revision to
1219          * which we have rebased this page.
1220          *
1221          * @since 1.27
1222          * @return int Revision ID
1223          */
1224         public function getParentRevId() {
1225                 if ( $this->parentRevId ) {
1226                         return $this->parentRevId;
1227                 } else {
1228                         return $this->mArticle->getRevIdFetched();
1229                 }
1230         }
1231
1232         /**
1233          * Get the current content of the page. This is basically similar to
1234          * WikiPage::getContent( Revision::RAW ) except that when the page doesn't exist an empty
1235          * content object is returned instead of null.
1236          *
1237          * @since 1.21
1238          * @return Content
1239          */
1240         protected function getCurrentContent() {
1241                 $rev = $this->page->getRevision();
1242                 $content = $rev ? $rev->getContent( Revision::RAW ) : null;
1243
1244                 if ( $content === false || $content === null ) {
1245                         if ( !$this->contentModel ) {
1246                                 $this->contentModel = $this->getTitle()->getContentModel();
1247                         }
1248                         $handler = ContentHandler::getForModelID( $this->contentModel );
1249
1250                         return $handler->makeEmptyContent();
1251                 } else {
1252                         # nasty side-effect, but needed for consistency
1253                         $this->contentModel = $rev->getContentModel();
1254                         $this->contentFormat = $rev->getContentFormat();
1255
1256                         return $content;
1257                 }
1258         }
1259
1260         /**
1261          * Use this method before edit() to preload some content into the edit box
1262          *
1263          * @param Content $content
1264          *
1265          * @since 1.21
1266          */
1267         public function setPreloadedContent( Content $content ) {
1268                 $this->mPreloadContent = $content;
1269         }
1270
1271         /**
1272          * Get the contents to be preloaded into the box, either set by
1273          * an earlier setPreloadText() or by loading the given page.
1274          *
1275          * @param string $preload Representing the title to preload from.
1276          * @param array $params Parameters to use (interface-message style) in the preloaded text
1277          *
1278          * @return Content
1279          *
1280          * @since 1.21
1281          */
1282         protected function getPreloadedContent( $preload, $params = [] ) {
1283                 global $wgUser;
1284
1285                 if ( !empty( $this->mPreloadContent ) ) {
1286                         return $this->mPreloadContent;
1287                 }
1288
1289                 $handler = ContentHandler::getForTitle( $this->getTitle() );
1290
1291                 if ( $preload === '' ) {
1292                         return $handler->makeEmptyContent();
1293                 }
1294
1295                 $title = Title::newFromText( $preload );
1296                 # Check for existence to avoid getting MediaWiki:Noarticletext
1297                 if ( $title === null || !$title->exists() || !$title->userCan( 'read', $wgUser ) ) {
1298                         // TODO: somehow show a warning to the user!
1299                         return $handler->makeEmptyContent();
1300                 }
1301
1302                 $page = WikiPage::factory( $title );
1303                 if ( $page->isRedirect() ) {
1304                         $title = $page->getRedirectTarget();
1305                         # Same as before
1306                         if ( $title === null || !$title->exists() || !$title->userCan( 'read', $wgUser ) ) {
1307                                 // TODO: somehow show a warning to the user!
1308                                 return $handler->makeEmptyContent();
1309                         }
1310                         $page = WikiPage::factory( $title );
1311                 }
1312
1313                 $parserOptions = ParserOptions::newFromUser( $wgUser );
1314                 $content = $page->getContent( Revision::RAW );
1315
1316                 if ( !$content ) {
1317                         // TODO: somehow show a warning to the user!
1318                         return $handler->makeEmptyContent();
1319                 }
1320
1321                 if ( $content->getModel() !== $handler->getModelID() ) {
1322                         $converted = $content->convert( $handler->getModelID() );
1323
1324                         if ( !$converted ) {
1325                                 // TODO: somehow show a warning to the user!
1326                                 wfDebug( "Attempt to preload incompatible content: " .
1327                                         "can't convert " . $content->getModel() .
1328                                         " to " . $handler->getModelID() );
1329
1330                                 return $handler->makeEmptyContent();
1331                         }
1332
1333                         $content = $converted;
1334                 }
1335
1336                 return $content->preloadTransform( $title, $parserOptions, $params );
1337         }
1338
1339         /**
1340          * Make sure the form isn't faking a user's credentials.
1341          *
1342          * @param WebRequest $request
1343          * @return bool
1344          * @private
1345          */
1346         function tokenOk( &$request ) {
1347                 global $wgUser;
1348                 $token = $request->getVal( 'wpEditToken' );
1349                 $this->mTokenOk = $wgUser->matchEditToken( $token );
1350                 $this->mTokenOkExceptSuffix = $wgUser->matchEditTokenNoSuffix( $token );
1351                 return $this->mTokenOk;
1352         }
1353
1354         /**
1355          * Sets post-edit cookie indicating the user just saved a particular revision.
1356          *
1357          * This uses a temporary cookie for each revision ID so separate saves will never
1358          * interfere with each other.
1359          *
1360          * The cookie is deleted in the mediawiki.action.view.postEdit JS module after
1361          * the redirect.  It must be clearable by JavaScript code, so it must not be
1362          * marked HttpOnly. The JavaScript code converts the cookie to a wgPostEdit config
1363          * variable.
1364          *
1365          * If the variable were set on the server, it would be cached, which is unwanted
1366          * since the post-edit state should only apply to the load right after the save.
1367          *
1368          * @param int $statusValue The status value (to check for new article status)
1369          */
1370         protected function setPostEditCookie( $statusValue ) {
1371                 $revisionId = $this->page->getLatest();
1372                 $postEditKey = self::POST_EDIT_COOKIE_KEY_PREFIX . $revisionId;
1373
1374                 $val = 'saved';
1375                 if ( $statusValue == self::AS_SUCCESS_NEW_ARTICLE ) {
1376                         $val = 'created';
1377                 } elseif ( $this->oldid ) {
1378                         $val = 'restored';
1379                 }
1380
1381                 $response = RequestContext::getMain()->getRequest()->response();
1382                 $response->setCookie( $postEditKey, $val, time() + self::POST_EDIT_COOKIE_DURATION, [
1383                         'httpOnly' => false,
1384                 ] );
1385         }
1386
1387         /**
1388          * Attempt submission
1389          * @param array $resultDetails See docs for $result in internalAttemptSave
1390          * @throws UserBlockedError|ReadOnlyError|ThrottledError|PermissionsError
1391          * @return Status The resulting status object.
1392          */
1393         public function attemptSave( &$resultDetails = false ) {
1394                 global $wgUser;
1395
1396                 # Allow bots to exempt some edits from bot flagging
1397                 $bot = $wgUser->isAllowed( 'bot' ) && $this->bot;
1398                 $status = $this->internalAttemptSave( $resultDetails, $bot );
1399
1400                 Hooks::run( 'EditPage::attemptSave:after', [ $this, $status, $resultDetails ] );
1401
1402                 return $status;
1403         }
1404
1405         /**
1406          * Handle status, such as after attempt save
1407          *
1408          * @param Status $status
1409          * @param array|bool $resultDetails
1410          *
1411          * @throws ErrorPageError
1412          * @return bool False, if output is done, true if rest of the form should be displayed
1413          */
1414         private function handleStatus( Status $status, $resultDetails ) {
1415                 global $wgUser, $wgOut;
1416
1417                 /**
1418                  * @todo FIXME: once the interface for internalAttemptSave() is made
1419                  *   nicer, this should use the message in $status
1420                  */
1421                 if ( $status->value == self::AS_SUCCESS_UPDATE
1422                         || $status->value == self::AS_SUCCESS_NEW_ARTICLE
1423                 ) {
1424                         $this->didSave = true;
1425                         if ( !$resultDetails['nullEdit'] ) {
1426                                 $this->setPostEditCookie( $status->value );
1427                         }
1428                 }
1429
1430                 // "wpExtraQueryRedirect" is a hidden input to modify
1431                 // after save URL and is not used by actual edit form
1432                 $request = RequestContext::getMain()->getRequest();
1433                 $extraQueryRedirect = $request->getVal( 'wpExtraQueryRedirect' );
1434
1435                 switch ( $status->value ) {
1436                         case self::AS_HOOK_ERROR_EXPECTED:
1437                         case self::AS_CONTENT_TOO_BIG:
1438                         case self::AS_ARTICLE_WAS_DELETED:
1439                         case self::AS_CONFLICT_DETECTED:
1440                         case self::AS_SUMMARY_NEEDED:
1441                         case self::AS_TEXTBOX_EMPTY:
1442                         case self::AS_MAX_ARTICLE_SIZE_EXCEEDED:
1443                         case self::AS_END:
1444                         case self::AS_BLANK_ARTICLE:
1445                         case self::AS_SELF_REDIRECT:
1446                                 return true;
1447
1448                         case self::AS_HOOK_ERROR:
1449                                 return false;
1450
1451                         case self::AS_CANNOT_USE_CUSTOM_MODEL:
1452                         case self::AS_PARSE_ERROR:
1453                                 $wgOut->addWikiText( '<div class="error">' . $status->getWikiText() . '</div>' );
1454                                 return true;
1455
1456                         case self::AS_SUCCESS_NEW_ARTICLE:
1457                                 $query = $resultDetails['redirect'] ? 'redirect=no' : '';
1458                                 if ( $extraQueryRedirect ) {
1459                                         if ( $query === '' ) {
1460                                                 $query = $extraQueryRedirect;
1461                                         } else {
1462                                                 $query = $query . '&' . $extraQueryRedirect;
1463                                         }
1464                                 }
1465                                 $anchor = isset( $resultDetails['sectionanchor'] ) ? $resultDetails['sectionanchor'] : '';
1466                                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $anchor );
1467                                 return false;
1468
1469                         case self::AS_SUCCESS_UPDATE:
1470                                 $extraQuery = '';
1471                                 $sectionanchor = $resultDetails['sectionanchor'];
1472
1473                                 // Give extensions a chance to modify URL query on update
1474                                 Hooks::run(
1475                                         'ArticleUpdateBeforeRedirect',
1476                                         [ $this->mArticle, &$sectionanchor, &$extraQuery ]
1477                                 );
1478
1479                                 if ( $resultDetails['redirect'] ) {
1480                                         if ( $extraQuery == '' ) {
1481                                                 $extraQuery = 'redirect=no';
1482                                         } else {
1483                                                 $extraQuery = 'redirect=no&' . $extraQuery;
1484                                         }
1485                                 }
1486                                 if ( $extraQueryRedirect ) {
1487                                         if ( $extraQuery === '' ) {
1488                                                 $extraQuery = $extraQueryRedirect;
1489                                         } else {
1490                                                 $extraQuery = $extraQuery . '&' . $extraQueryRedirect;
1491                                         }
1492                                 }
1493
1494                                 $wgOut->redirect( $this->mTitle->getFullURL( $extraQuery ) . $sectionanchor );
1495                                 return false;
1496
1497                         case self::AS_SPAM_ERROR:
1498                                 $this->spamPageWithContent( $resultDetails['spam'] );
1499                                 return false;
1500
1501                         case self::AS_BLOCKED_PAGE_FOR_USER:
1502                                 throw new UserBlockedError( $wgUser->getBlock() );
1503
1504                         case self::AS_IMAGE_REDIRECT_ANON:
1505                         case self::AS_IMAGE_REDIRECT_LOGGED:
1506                                 throw new PermissionsError( 'upload' );
1507
1508                         case self::AS_READ_ONLY_PAGE_ANON:
1509                         case self::AS_READ_ONLY_PAGE_LOGGED:
1510                                 throw new PermissionsError( 'edit' );
1511
1512                         case self::AS_READ_ONLY_PAGE:
1513                                 throw new ReadOnlyError;
1514
1515                         case self::AS_RATE_LIMITED:
1516                                 throw new ThrottledError();
1517
1518                         case self::AS_NO_CREATE_PERMISSION:
1519                                 $permission = $this->mTitle->isTalkPage() ? 'createtalk' : 'createpage';
1520                                 throw new PermissionsError( $permission );
1521
1522                         case self::AS_NO_CHANGE_CONTENT_MODEL:
1523                                 throw new PermissionsError( 'editcontentmodel' );
1524
1525                         default:
1526                                 // We don't recognize $status->value. The only way that can happen
1527                                 // is if an extension hook aborted from inside ArticleSave.
1528                                 // Render the status object into $this->hookError
1529                                 // FIXME this sucks, we should just use the Status object throughout
1530                                 $this->hookError = '<div class="error">' . $status->getWikiText() .
1531                                         '</div>';
1532                                 return true;
1533                 }
1534         }
1535
1536         /**
1537          * Run hooks that can filter edits just before they get saved.
1538          *
1539          * @param Content $content The Content to filter.
1540          * @param Status $status For reporting the outcome to the caller
1541          * @param User $user The user performing the edit
1542          *
1543          * @return bool
1544          */
1545         protected function runPostMergeFilters( Content $content, Status $status, User $user ) {
1546                 // Run old style post-section-merge edit filter
1547                 if ( !ContentHandler::runLegacyHooks( 'EditFilterMerged',
1548                         [ $this, $content, &$this->hookError, $this->summary ] )
1549                 ) {
1550                         # Error messages etc. could be handled within the hook...
1551                         $status->fatal( 'hookaborted' );
1552                         $status->value = self::AS_HOOK_ERROR;
1553                         return false;
1554                 } elseif ( $this->hookError != '' ) {
1555                         # ...or the hook could be expecting us to produce an error
1556                         $status->fatal( 'hookaborted' );
1557                         $status->value = self::AS_HOOK_ERROR_EXPECTED;
1558                         return false;
1559                 }
1560
1561                 // Run new style post-section-merge edit filter
1562                 if ( !Hooks::run( 'EditFilterMergedContent',
1563                                 [ $this->mArticle->getContext(), $content, $status, $this->summary,
1564                                 $user, $this->minoredit ] )
1565                 ) {
1566                         # Error messages etc. could be handled within the hook...
1567                         if ( $status->isGood() ) {
1568                                 $status->fatal( 'hookaborted' );
1569                                 // Not setting $this->hookError here is a hack to allow the hook
1570                                 // to cause a return to the edit page without $this->hookError
1571                                 // being set. This is used by ConfirmEdit to display a captcha
1572                                 // without any error message cruft.
1573                         } else {
1574                                 $this->hookError = $status->getWikiText();
1575                         }
1576                         // Use the existing $status->value if the hook set it
1577                         if ( !$status->value ) {
1578                                 $status->value = self::AS_HOOK_ERROR;
1579                         }
1580                         return false;
1581                 } elseif ( !$status->isOK() ) {
1582                         # ...or the hook could be expecting us to produce an error
1583                         // FIXME this sucks, we should just use the Status object throughout
1584                         $this->hookError = $status->getWikiText();
1585                         $status->fatal( 'hookaborted' );
1586                         $status->value = self::AS_HOOK_ERROR_EXPECTED;
1587                         return false;
1588                 }
1589
1590                 return true;
1591         }
1592
1593         /**
1594          * Return the summary to be used for a new section.
1595          *
1596          * @param string $sectionanchor Set to the section anchor text
1597          * @return string
1598          */
1599         private function newSectionSummary( &$sectionanchor = null ) {
1600                 global $wgParser;
1601
1602                 if ( $this->sectiontitle !== '' ) {
1603                         $sectionanchor = $wgParser->guessLegacySectionNameFromWikiText( $this->sectiontitle );
1604                         // If no edit summary was specified, create one automatically from the section
1605                         // title and have it link to the new section. Otherwise, respect the summary as
1606                         // passed.
1607                         if ( $this->summary === '' ) {
1608                                 $cleanSectionTitle = $wgParser->stripSectionName( $this->sectiontitle );
1609                                 return wfMessage( 'newsectionsummary' )
1610                                         ->rawParams( $cleanSectionTitle )->inContentLanguage()->text();
1611                         }
1612                 } elseif ( $this->summary !== '' ) {
1613                         $sectionanchor = $wgParser->guessLegacySectionNameFromWikiText( $this->summary );
1614                         # This is a new section, so create a link to the new section
1615                         # in the revision summary.
1616                         $cleanSummary = $wgParser->stripSectionName( $this->summary );
1617                         return wfMessage( 'newsectionsummary' )
1618                                 ->rawParams( $cleanSummary )->inContentLanguage()->text();
1619                 }
1620                 return $this->summary;
1621         }
1622
1623         /**
1624          * Attempt submission (no UI)
1625          *
1626          * @param array $result Array to add statuses to, currently with the
1627          *   possible keys:
1628          *   - spam (string): Spam string from content if any spam is detected by
1629          *     matchSpamRegex.
1630          *   - sectionanchor (string): Section anchor for a section save.
1631          *   - nullEdit (boolean): Set if doEditContent is OK.  True if null edit,
1632          *     false otherwise.
1633          *   - redirect (bool): Set if doEditContent is OK. True if resulting
1634          *     revision is a redirect.
1635          * @param bool $bot True if edit is being made under the bot right.
1636          *
1637          * @return Status Status object, possibly with a message, but always with
1638          *   one of the AS_* constants in $status->value,
1639          *
1640          * @todo FIXME: This interface is TERRIBLE, but hard to get rid of due to
1641          *   various error display idiosyncrasies. There are also lots of cases
1642          *   where error metadata is set in the object and retrieved later instead
1643          *   of being returned, e.g. AS_CONTENT_TOO_BIG and
1644          *   AS_BLOCKED_PAGE_FOR_USER. All that stuff needs to be cleaned up some
1645          * time.
1646          */
1647         function internalAttemptSave( &$result, $bot = false ) {
1648                 global $wgUser, $wgRequest, $wgParser, $wgMaxArticleSize;
1649                 global $wgContentHandlerUseDB;
1650
1651                 $status = Status::newGood();
1652
1653                 if ( !Hooks::run( 'EditPage::attemptSave', [ $this ] ) ) {
1654                         wfDebug( "Hook 'EditPage::attemptSave' aborted article saving\n" );
1655                         $status->fatal( 'hookaborted' );
1656                         $status->value = self::AS_HOOK_ERROR;
1657                         return $status;
1658                 }
1659
1660                 $spam = $wgRequest->getText( 'wpAntispam' );
1661                 if ( $spam !== '' ) {
1662                         wfDebugLog(
1663                                 'SimpleAntiSpam',
1664                                 $wgUser->getName() .
1665                                 ' editing "' .
1666                                 $this->mTitle->getPrefixedText() .
1667                                 '" submitted bogus field "' .
1668                                 $spam .
1669                                 '"'
1670                         );
1671                         $status->fatal( 'spamprotectionmatch', false );
1672                         $status->value = self::AS_SPAM_ERROR;
1673                         return $status;
1674                 }
1675
1676                 try {
1677                         # Construct Content object
1678                         $textbox_content = $this->toEditContent( $this->textbox1 );
1679                 } catch ( MWContentSerializationException $ex ) {
1680                         $status->fatal(
1681                                 'content-failed-to-parse',
1682                                 $this->contentModel,
1683                                 $this->contentFormat,
1684                                 $ex->getMessage()
1685                         );
1686                         $status->value = self::AS_PARSE_ERROR;
1687                         return $status;
1688                 }
1689
1690                 # Check image redirect
1691                 if ( $this->mTitle->getNamespace() == NS_FILE &&
1692                         $textbox_content->isRedirect() &&
1693                         !$wgUser->isAllowed( 'upload' )
1694                 ) {
1695                                 $code = $wgUser->isAnon() ? self::AS_IMAGE_REDIRECT_ANON : self::AS_IMAGE_REDIRECT_LOGGED;
1696                                 $status->setResult( false, $code );
1697
1698                                 return $status;
1699                 }
1700
1701                 # Check for spam
1702                 $match = self::matchSummarySpamRegex( $this->summary );
1703                 if ( $match === false && $this->section == 'new' ) {
1704                         # $wgSpamRegex is enforced on this new heading/summary because, unlike
1705                         # regular summaries, it is added to the actual wikitext.
1706                         if ( $this->sectiontitle !== '' ) {
1707                                 # This branch is taken when the API is used with the 'sectiontitle' parameter.
1708                                 $match = self::matchSpamRegex( $this->sectiontitle );
1709                         } else {
1710                                 # This branch is taken when the "Add Topic" user interface is used, or the API
1711                                 # is used with the 'summary' parameter.
1712                                 $match = self::matchSpamRegex( $this->summary );
1713                         }
1714                 }
1715                 if ( $match === false ) {
1716                         $match = self::matchSpamRegex( $this->textbox1 );
1717                 }
1718                 if ( $match !== false ) {
1719                         $result['spam'] = $match;
1720                         $ip = $wgRequest->getIP();
1721                         $pdbk = $this->mTitle->getPrefixedDBkey();
1722                         $match = str_replace( "\n", '', $match );
1723                         wfDebugLog( 'SpamRegex', "$ip spam regex hit [[$pdbk]]: \"$match\"" );
1724                         $status->fatal( 'spamprotectionmatch', $match );
1725                         $status->value = self::AS_SPAM_ERROR;
1726                         return $status;
1727                 }
1728                 if ( !Hooks::run(
1729                         'EditFilter',
1730                         [ $this, $this->textbox1, $this->section, &$this->hookError, $this->summary ] )
1731                 ) {
1732                         # Error messages etc. could be handled within the hook...
1733                         $status->fatal( 'hookaborted' );
1734                         $status->value = self::AS_HOOK_ERROR;
1735                         return $status;
1736                 } elseif ( $this->hookError != '' ) {
1737                         # ...or the hook could be expecting us to produce an error
1738                         $status->fatal( 'hookaborted' );
1739                         $status->value = self::AS_HOOK_ERROR_EXPECTED;
1740                         return $status;
1741                 }
1742
1743                 if ( $wgUser->isBlockedFrom( $this->mTitle, false ) ) {
1744                         // Auto-block user's IP if the account was "hard" blocked
1745                         if ( !wfReadOnly() ) {
1746                                 $wgUser->spreadAnyEditBlock();
1747                         }
1748                         # Check block state against master, thus 'false'.
1749                         $status->setResult( false, self::AS_BLOCKED_PAGE_FOR_USER );
1750                         return $status;
1751                 }
1752
1753                 $this->kblength = (int)( strlen( $this->textbox1 ) / 1024 );
1754                 if ( $this->kblength > $wgMaxArticleSize ) {
1755                         // Error will be displayed by showEditForm()
1756                         $this->tooBig = true;
1757                         $status->setResult( false, self::AS_CONTENT_TOO_BIG );
1758                         return $status;
1759                 }
1760
1761                 if ( !$wgUser->isAllowed( 'edit' ) ) {
1762                         if ( $wgUser->isAnon() ) {
1763                                 $status->setResult( false, self::AS_READ_ONLY_PAGE_ANON );
1764                                 return $status;
1765                         } else {
1766                                 $status->fatal( 'readonlytext' );
1767                                 $status->value = self::AS_READ_ONLY_PAGE_LOGGED;
1768                                 return $status;
1769                         }
1770                 }
1771
1772                 $changingContentModel = false;
1773                 if ( $this->contentModel !== $this->mTitle->getContentModel() ) {
1774                         if ( !$wgContentHandlerUseDB ) {
1775                                 $status->fatal( 'editpage-cannot-use-custom-model' );
1776                                 $status->value = self::AS_CANNOT_USE_CUSTOM_MODEL;
1777                                 return $status;
1778                         } elseif ( !$wgUser->isAllowed( 'editcontentmodel' ) ) {
1779                                 $status->setResult( false, self::AS_NO_CHANGE_CONTENT_MODEL );
1780                                 return $status;
1781
1782                         }
1783                         $changingContentModel = true;
1784                         $oldContentModel = $this->mTitle->getContentModel();
1785                 }
1786
1787                 if ( $this->changeTags ) {
1788                         $changeTagsStatus = ChangeTags::canAddTagsAccompanyingChange(
1789                                 $this->changeTags, $wgUser );
1790                         if ( !$changeTagsStatus->isOK() ) {
1791                                 $changeTagsStatus->value = self::AS_CHANGE_TAG_ERROR;
1792                                 return $changeTagsStatus;
1793                         }
1794                 }
1795
1796                 if ( wfReadOnly() ) {
1797                         $status->fatal( 'readonlytext' );
1798                         $status->value = self::AS_READ_ONLY_PAGE;
1799                         return $status;
1800                 }
1801                 if ( $wgUser->pingLimiter() || $wgUser->pingLimiter( 'linkpurge', 0 ) ) {
1802                         $status->fatal( 'actionthrottledtext' );
1803                         $status->value = self::AS_RATE_LIMITED;
1804                         return $status;
1805                 }
1806
1807                 # If the article has been deleted while editing, don't save it without
1808                 # confirmation
1809                 if ( $this->wasDeletedSinceLastEdit() && !$this->recreate ) {
1810                         $status->setResult( false, self::AS_ARTICLE_WAS_DELETED );
1811                         return $status;
1812                 }
1813
1814                 # Load the page data from the master. If anything changes in the meantime,
1815                 # we detect it by using page_latest like a token in a 1 try compare-and-swap.
1816                 $this->page->loadPageData( 'fromdbmaster' );
1817                 $new = !$this->page->exists();
1818
1819                 if ( $new ) {
1820                         // Late check for create permission, just in case *PARANOIA*
1821                         if ( !$this->mTitle->userCan( 'create', $wgUser ) ) {
1822                                 $status->fatal( 'nocreatetext' );
1823                                 $status->value = self::AS_NO_CREATE_PERMISSION;
1824                                 wfDebug( __METHOD__ . ": no create permission\n" );
1825                                 return $status;
1826                         }
1827
1828                         // Don't save a new page if it's blank or if it's a MediaWiki:
1829                         // message with content equivalent to default (allow empty pages
1830                         // in this case to disable messages, see bug 50124)
1831                         $defaultMessageText = $this->mTitle->getDefaultMessageText();
1832                         if ( $this->mTitle->getNamespace() === NS_MEDIAWIKI && $defaultMessageText !== false ) {
1833                                 $defaultText = $defaultMessageText;
1834                         } else {
1835                                 $defaultText = '';
1836                         }
1837
1838                         if ( !$this->allowBlankArticle && $this->textbox1 === $defaultText ) {
1839                                 $this->blankArticle = true;
1840                                 $status->fatal( 'blankarticle' );
1841                                 $status->setResult( false, self::AS_BLANK_ARTICLE );
1842                                 return $status;
1843                         }
1844
1845                         if ( !$this->runPostMergeFilters( $textbox_content, $status, $wgUser ) ) {
1846                                 return $status;
1847                         }
1848
1849                         $content = $textbox_content;
1850
1851                         $result['sectionanchor'] = '';
1852                         if ( $this->section == 'new' ) {
1853                                 if ( $this->sectiontitle !== '' ) {
1854                                         // Insert the section title above the content.
1855                                         $content = $content->addSectionHeader( $this->sectiontitle );
1856                                 } elseif ( $this->summary !== '' ) {
1857                                         // Insert the section title above the content.
1858                                         $content = $content->addSectionHeader( $this->summary );
1859                                 }
1860                                 $this->summary = $this->newSectionSummary( $result['sectionanchor'] );
1861                         }
1862
1863                         $status->value = self::AS_SUCCESS_NEW_ARTICLE;
1864
1865                 } else { # not $new
1866
1867                         # Article exists. Check for edit conflict.
1868
1869                         $this->page->clear(); # Force reload of dates, etc.
1870                         $timestamp = $this->page->getTimestamp();
1871                         $latest = $this->page->getLatest();
1872
1873                         wfDebug( "timestamp: {$timestamp}, edittime: {$this->edittime}\n" );
1874
1875                         // Check editRevId if set, which handles same-second timestamp collisions
1876                         if ( $timestamp != $this->edittime
1877                                 || ( $this->editRevId !== null && $this->editRevId != $latest )
1878                         ) {
1879                                 $this->isConflict = true;
1880                                 if ( $this->section == 'new' ) {
1881                                         if ( $this->page->getUserText() == $wgUser->getName() &&
1882                                                 $this->page->getComment() == $this->newSectionSummary()
1883                                         ) {
1884                                                 // Probably a duplicate submission of a new comment.
1885                                                 // This can happen when CDN resends a request after
1886                                                 // a timeout but the first one actually went through.
1887                                                 wfDebug( __METHOD__
1888                                                         . ": duplicate new section submission; trigger edit conflict!\n" );
1889                                         } else {
1890                                                 // New comment; suppress conflict.
1891                                                 $this->isConflict = false;
1892                                                 wfDebug( __METHOD__ . ": conflict suppressed; new section\n" );
1893                                         }
1894                                 } elseif ( $this->section == ''
1895                                         && Revision::userWasLastToEdit(
1896                                                 DB_MASTER, $this->mTitle->getArticleID(),
1897                                                 $wgUser->getId(), $this->edittime
1898                                         )
1899                                 ) {
1900                                         # Suppress edit conflict with self, except for section edits where merging is required.
1901                                         wfDebug( __METHOD__ . ": Suppressing edit conflict, same user.\n" );
1902                                         $this->isConflict = false;
1903                                 }
1904                         }
1905
1906                         // If sectiontitle is set, use it, otherwise use the summary as the section title.
1907                         if ( $this->sectiontitle !== '' ) {
1908                                 $sectionTitle = $this->sectiontitle;
1909                         } else {
1910                                 $sectionTitle = $this->summary;
1911                         }
1912
1913                         $content = null;
1914
1915                         if ( $this->isConflict ) {
1916                                 wfDebug( __METHOD__
1917                                         . ": conflict! getting section '{$this->section}' for time '{$this->edittime}'"
1918                                         . " (id '{$this->editRevId}') (article time '{$timestamp}')\n" );
1919                                 // @TODO: replaceSectionAtRev() with base ID (not prior current) for ?oldid=X case
1920                                 // ...or disable section editing for non-current revisions (not exposed anyway).
1921                                 if ( $this->editRevId !== null ) {
1922                                         $content = $this->page->replaceSectionAtRev(
1923                                                 $this->section,
1924                                                 $textbox_content,
1925                                                 $sectionTitle,
1926                                                 $this->editRevId
1927                                         );
1928                                 } else {
1929                                         $content = $this->page->replaceSectionContent(
1930                                                 $this->section,
1931                                                 $textbox_content,
1932                                                 $sectionTitle,
1933                                                 $this->edittime
1934                                         );
1935                                 }
1936                         } else {
1937                                 wfDebug( __METHOD__ . ": getting section '{$this->section}'\n" );
1938                                 $content = $this->page->replaceSectionContent(
1939                                         $this->section,
1940                                         $textbox_content,
1941                                         $sectionTitle
1942                                 );
1943                         }
1944
1945                         if ( is_null( $content ) ) {
1946                                 wfDebug( __METHOD__ . ": activating conflict; section replace failed.\n" );
1947                                 $this->isConflict = true;
1948                                 $content = $textbox_content; // do not try to merge here!
1949                         } elseif ( $this->isConflict ) {
1950                                 # Attempt merge
1951                                 if ( $this->mergeChangesIntoContent( $content ) ) {
1952                                         // Successful merge! Maybe we should tell the user the good news?
1953                                         $this->isConflict = false;
1954                                         wfDebug( __METHOD__ . ": Suppressing edit conflict, successful merge.\n" );
1955                                 } else {
1956                                         $this->section = '';
1957                                         $this->textbox1 = ContentHandler::getContentText( $content );
1958                                         wfDebug( __METHOD__ . ": Keeping edit conflict, failed merge.\n" );
1959                                 }
1960                         }
1961
1962                         if ( $this->isConflict ) {
1963                                 $status->setResult( false, self::AS_CONFLICT_DETECTED );
1964                                 return $status;
1965                         }
1966
1967                         if ( !$this->runPostMergeFilters( $content, $status, $wgUser ) ) {
1968                                 return $status;
1969                         }
1970
1971                         if ( $this->section == 'new' ) {
1972                                 // Handle the user preference to force summaries here
1973                                 if ( !$this->allowBlankSummary && trim( $this->summary ) == '' ) {
1974                                         $this->missingSummary = true;
1975                                         $status->fatal( 'missingsummary' ); // or 'missingcommentheader' if $section == 'new'. Blegh
1976                                         $status->value = self::AS_SUMMARY_NEEDED;
1977                                         return $status;
1978                                 }
1979
1980                                 // Do not allow the user to post an empty comment
1981                                 if ( $this->textbox1 == '' ) {
1982                                         $this->missingComment = true;
1983                                         $status->fatal( 'missingcommenttext' );
1984                                         $status->value = self::AS_TEXTBOX_EMPTY;
1985                                         return $status;
1986                                 }
1987                         } elseif ( !$this->allowBlankSummary
1988                                 && !$content->equals( $this->getOriginalContent( $wgUser ) )
1989                                 && !$content->isRedirect()
1990                                 && md5( $this->summary ) == $this->autoSumm
1991                         ) {
1992                                 $this->missingSummary = true;
1993                                 $status->fatal( 'missingsummary' );
1994                                 $status->value = self::AS_SUMMARY_NEEDED;
1995                                 return $status;
1996                         }
1997
1998                         # All's well
1999                         $sectionanchor = '';
2000                         if ( $this->section == 'new' ) {
2001                                 $this->summary = $this->newSectionSummary( $sectionanchor );
2002                         } elseif ( $this->section != '' ) {
2003                                 # Try to get a section anchor from the section source, redirect
2004                                 # to edited section if header found.
2005                                 # XXX: Might be better to integrate this into Article::replaceSectionAtRev
2006                                 # for duplicate heading checking and maybe parsing.
2007                                 $hasmatch = preg_match( "/^ *([=]{1,6})(.*?)(\\1) *\\n/i", $this->textbox1, $matches );
2008                                 # We can't deal with anchors, includes, html etc in the header for now,
2009                                 # headline would need to be parsed to improve this.
2010                                 if ( $hasmatch && strlen( $matches[2] ) > 0 ) {
2011                                         $sectionanchor = $wgParser->guessLegacySectionNameFromWikiText( $matches[2] );
2012                                 }
2013                         }
2014                         $result['sectionanchor'] = $sectionanchor;
2015
2016                         // Save errors may fall down to the edit form, but we've now
2017                         // merged the section into full text. Clear the section field
2018                         // so that later submission of conflict forms won't try to
2019                         // replace that into a duplicated mess.
2020                         $this->textbox1 = $this->toEditText( $content );
2021                         $this->section = '';
2022
2023                         $status->value = self::AS_SUCCESS_UPDATE;
2024                 }
2025
2026                 if ( !$this->allowSelfRedirect
2027                         && $content->isRedirect()
2028                         && $content->getRedirectTarget()->equals( $this->getTitle() )
2029                 ) {
2030                         // If the page already redirects to itself, don't warn.
2031                         $currentTarget = $this->getCurrentContent()->getRedirectTarget();
2032                         if ( !$currentTarget || !$currentTarget->equals( $this->getTitle() ) ) {
2033                                 $this->selfRedirect = true;
2034                                 $status->fatal( 'selfredirect' );
2035                                 $status->value = self::AS_SELF_REDIRECT;
2036                                 return $status;
2037                         }
2038                 }
2039
2040                 // Check for length errors again now that the section is merged in
2041                 $this->kblength = (int)( strlen( $this->toEditText( $content ) ) / 1024 );
2042                 if ( $this->kblength > $wgMaxArticleSize ) {
2043                         $this->tooBig = true;
2044                         $status->setResult( false, self::AS_MAX_ARTICLE_SIZE_EXCEEDED );
2045                         return $status;
2046                 }
2047
2048                 $flags = EDIT_AUTOSUMMARY |
2049                         ( $new ? EDIT_NEW : EDIT_UPDATE ) |
2050                         ( ( $this->minoredit && !$this->isNew ) ? EDIT_MINOR : 0 ) |
2051                         ( $bot ? EDIT_FORCE_BOT : 0 );
2052
2053                 $doEditStatus = $this->page->doEditContent(
2054                         $content,
2055                         $this->summary,
2056                         $flags,
2057                         false,
2058                         $wgUser,
2059                         $content->getDefaultFormat(),
2060                         $this->changeTags
2061                 );
2062
2063                 if ( !$doEditStatus->isOK() ) {
2064                         // Failure from doEdit()
2065                         // Show the edit conflict page for certain recognized errors from doEdit(),
2066                         // but don't show it for errors from extension hooks
2067                         $errors = $doEditStatus->getErrorsArray();
2068                         if ( in_array( $errors[0][0],
2069                                         [ 'edit-gone-missing', 'edit-conflict', 'edit-already-exists' ] )
2070                         ) {
2071                                 $this->isConflict = true;
2072                                 // Destroys data doEdit() put in $status->value but who cares
2073                                 $doEditStatus->value = self::AS_END;
2074                         }
2075                         return $doEditStatus;
2076                 }
2077
2078                 $result['nullEdit'] = $doEditStatus->hasMessage( 'edit-no-change' );
2079                 if ( $result['nullEdit'] ) {
2080                         // We don't know if it was a null edit until now, so increment here
2081                         $wgUser->pingLimiter( 'linkpurge' );
2082                 }
2083                 $result['redirect'] = $content->isRedirect();
2084
2085                 $this->updateWatchlist();
2086
2087                 // If the content model changed, add a log entry
2088                 if ( $changingContentModel ) {
2089                         $this->addContentModelChangeLogEntry(
2090                                 $wgUser,
2091                                 $new ? false : $oldContentModel,
2092                                 $this->contentModel,
2093                                 $this->summary
2094                         );
2095                 }
2096
2097                 return $status;
2098         }
2099
2100         /**
2101          * @param User $user
2102          * @param string|false $oldModel false if the page is being newly created
2103          * @param string $newModel
2104          * @param string $reason
2105          */
2106         protected function addContentModelChangeLogEntry( User $user, $oldModel, $newModel, $reason ) {
2107                 $new = $oldModel === false;
2108                 $log = new ManualLogEntry( 'contentmodel', $new ? 'new' : 'change' );
2109                 $log->setPerformer( $user );
2110                 $log->setTarget( $this->mTitle );
2111                 $log->setComment( $reason );
2112                 $log->setParameters( [
2113                         '4::oldmodel' => $oldModel,
2114                         '5::newmodel' => $newModel
2115                 ] );
2116                 $logid = $log->insert();
2117                 $log->publish( $logid );
2118         }
2119
2120         /**
2121          * Register the change of watch status
2122          */
2123         protected function updateWatchlist() {
2124                 global $wgUser;
2125
2126                 if ( !$wgUser->isLoggedIn() ) {
2127                         return;
2128                 }
2129
2130                 $user = $wgUser;
2131                 $title = $this->mTitle;
2132                 $watch = $this->watchthis;
2133                 // Do this in its own transaction to reduce contention...
2134                 DeferredUpdates::addCallableUpdate( function () use ( $user, $title, $watch ) {
2135                         if ( $watch == $user->isWatched( $title, User::IGNORE_USER_RIGHTS ) ) {
2136                                 return; // nothing to change
2137                         }
2138                         WatchAction::doWatchOrUnwatch( $watch, $title, $user );
2139                 } );
2140         }
2141
2142         /**
2143          * Attempts to do 3-way merge of edit content with a base revision
2144          * and current content, in case of edit conflict, in whichever way appropriate
2145          * for the content type.
2146          *
2147          * @since 1.21
2148          *
2149          * @param Content $editContent
2150          *
2151          * @return bool
2152          */
2153         private function mergeChangesIntoContent( &$editContent ) {
2154
2155                 $db = wfGetDB( DB_MASTER );
2156
2157                 // This is the revision the editor started from
2158                 $baseRevision = $this->getBaseRevision();
2159                 $baseContent = $baseRevision ? $baseRevision->getContent() : null;
2160
2161                 if ( is_null( $baseContent ) ) {
2162                         return false;
2163                 }
2164
2165                 // The current state, we want to merge updates into it
2166                 $currentRevision = Revision::loadFromTitle( $db, $this->mTitle );
2167                 $currentContent = $currentRevision ? $currentRevision->getContent() : null;
2168
2169                 if ( is_null( $currentContent ) ) {
2170                         return false;
2171                 }
2172
2173                 $handler = ContentHandler::getForModelID( $baseContent->getModel() );
2174
2175                 $result = $handler->merge3( $baseContent, $editContent, $currentContent );
2176
2177                 if ( $result ) {
2178                         $editContent = $result;
2179                         // Update parentRevId to what we just merged.
2180                         $this->parentRevId = $currentRevision->getId();
2181                         return true;
2182                 }
2183
2184                 return false;
2185         }
2186
2187         /**
2188          * @note: this method is very poorly named. If the user opened the form with ?oldid=X,
2189          *        one might think of X as the "base revision", which is NOT what this returns.
2190          * @return Revision Current version when the edit was started
2191          */
2192         function getBaseRevision() {
2193                 if ( !$this->mBaseRevision ) {
2194                         $db = wfGetDB( DB_MASTER );
2195                         $this->mBaseRevision = $this->editRevId
2196                                 ? Revision::newFromId( $this->editRevId, Revision::READ_LATEST )
2197                                 : Revision::loadFromTimestamp( $db, $this->mTitle, $this->edittime );
2198                 }
2199                 return $this->mBaseRevision;
2200         }
2201
2202         /**
2203          * Check given input text against $wgSpamRegex, and return the text of the first match.
2204          *
2205          * @param string $text
2206          *
2207          * @return string|bool Matching string or false
2208          */
2209         public static function matchSpamRegex( $text ) {
2210                 global $wgSpamRegex;
2211                 // For back compatibility, $wgSpamRegex may be a single string or an array of regexes.
2212                 $regexes = (array)$wgSpamRegex;
2213                 return self::matchSpamRegexInternal( $text, $regexes );
2214         }
2215
2216         /**
2217          * Check given input text against $wgSummarySpamRegex, and return the text of the first match.
2218          *
2219          * @param string $text
2220          *
2221          * @return string|bool Matching string or false
2222          */
2223         public static function matchSummarySpamRegex( $text ) {
2224                 global $wgSummarySpamRegex;
2225                 $regexes = (array)$wgSummarySpamRegex;
2226                 return self::matchSpamRegexInternal( $text, $regexes );
2227         }
2228
2229         /**
2230          * @param string $text
2231          * @param array $regexes
2232          * @return bool|string
2233          */
2234         protected static function matchSpamRegexInternal( $text, $regexes ) {
2235                 foreach ( $regexes as $regex ) {
2236                         $matches = [];
2237                         if ( preg_match( $regex, $text, $matches ) ) {
2238                                 return $matches[0];
2239                         }
2240                 }
2241                 return false;
2242         }
2243
2244         function setHeaders() {
2245                 global $wgOut, $wgUser, $wgAjaxEditStash;
2246
2247                 $wgOut->addModules( 'mediawiki.action.edit' );
2248                 $wgOut->addModuleStyles( 'mediawiki.action.edit.styles' );
2249
2250                 if ( $wgUser->getOption( 'showtoolbar' ) ) {
2251                         // The addition of default buttons is handled by getEditToolbar() which
2252                         // has its own dependency on this module. The call here ensures the module
2253                         // is loaded in time (it has position "top") for other modules to register
2254                         // buttons (e.g. extensions, gadgets, user scripts).
2255                         $wgOut->addModules( 'mediawiki.toolbar' );
2256                 }
2257
2258                 if ( $wgUser->getOption( 'uselivepreview' ) ) {
2259                         $wgOut->addModules( 'mediawiki.action.edit.preview' );
2260                 }
2261
2262                 if ( $wgUser->getOption( 'useeditwarning' ) ) {
2263                         $wgOut->addModules( 'mediawiki.action.edit.editWarning' );
2264                 }
2265
2266                 # Enabled article-related sidebar, toplinks, etc.
2267                 $wgOut->setArticleRelated( true );
2268
2269                 $contextTitle = $this->getContextTitle();
2270                 if ( $this->isConflict ) {
2271                         $msg = 'editconflict';
2272                 } elseif ( $contextTitle->exists() && $this->section != '' ) {
2273                         $msg = $this->section == 'new' ? 'editingcomment' : 'editingsection';
2274                 } else {
2275                         $msg = $contextTitle->exists()
2276                                 || ( $contextTitle->getNamespace() == NS_MEDIAWIKI
2277                                         && $contextTitle->getDefaultMessageText() !== false
2278                                 )
2279                                 ? 'editing'
2280                                 : 'creating';
2281                 }
2282
2283                 # Use the title defined by DISPLAYTITLE magic word when present
2284                 # NOTE: getDisplayTitle() returns HTML while getPrefixedText() returns plain text.
2285                 #       setPageTitle() treats the input as wikitext, which should be safe in either case.
2286                 $displayTitle = isset( $this->mParserOutput ) ? $this->mParserOutput->getDisplayTitle() : false;
2287                 if ( $displayTitle === false ) {
2288                         $displayTitle = $contextTitle->getPrefixedText();
2289                 }
2290                 $wgOut->setPageTitle( wfMessage( $msg, $displayTitle ) );
2291                 # Transmit the name of the message to JavaScript for live preview
2292                 # Keep Resources.php/mediawiki.action.edit.preview in sync with the possible keys
2293                 $wgOut->addJsConfigVars( [
2294                         'wgEditMessage' => $msg,
2295                         'wgAjaxEditStash' => $wgAjaxEditStash,
2296                 ] );
2297         }
2298
2299         /**
2300          * Show all applicable editing introductions
2301          */
2302         protected function showIntro() {
2303                 global $wgOut, $wgUser;
2304                 if ( $this->suppressIntro ) {
2305                         return;
2306                 }
2307
2308                 $namespace = $this->mTitle->getNamespace();
2309
2310                 if ( $namespace == NS_MEDIAWIKI ) {
2311                         # Show a warning if editing an interface message
2312                         $wgOut->wrapWikiMsg( "<div class='mw-editinginterface'>\n$1\n</div>", 'editinginterface' );
2313                         # If this is a default message (but not css or js),
2314                         # show a hint that it is translatable on translatewiki.net
2315                         if ( !$this->mTitle->hasContentModel( CONTENT_MODEL_CSS )
2316                                 && !$this->mTitle->hasContentModel( CONTENT_MODEL_JAVASCRIPT )
2317                         ) {
2318                                 $defaultMessageText = $this->mTitle->getDefaultMessageText();
2319                                 if ( $defaultMessageText !== false ) {
2320                                         $wgOut->wrapWikiMsg( "<div class='mw-translateinterface'>\n$1\n</div>",
2321                                                 'translateinterface' );
2322                                 }
2323                         }
2324                 } elseif ( $namespace == NS_FILE ) {
2325                         # Show a hint to shared repo
2326                         $file = wfFindFile( $this->mTitle );
2327                         if ( $file && !$file->isLocal() ) {
2328                                 $descUrl = $file->getDescriptionUrl();
2329                                 # there must be a description url to show a hint to shared repo
2330                                 if ( $descUrl ) {
2331                                         if ( !$this->mTitle->exists() ) {
2332                                                 $wgOut->wrapWikiMsg( "<div class=\"mw-sharedupload-desc-create\">\n$1\n</div>", [
2333                                                                         'sharedupload-desc-create', $file->getRepo()->getDisplayName(), $descUrl
2334                                                 ] );
2335                                         } else {
2336                                                 $wgOut->wrapWikiMsg( "<div class=\"mw-sharedupload-desc-edit\">\n$1\n</div>", [
2337                                                                         'sharedupload-desc-edit', $file->getRepo()->getDisplayName(), $descUrl
2338                                                 ] );
2339                                         }
2340                                 }
2341                         }
2342                 }
2343
2344                 # Show a warning message when someone creates/edits a user (talk) page but the user does not exist
2345                 # Show log extract when the user is currently blocked
2346                 if ( $namespace == NS_USER || $namespace == NS_USER_TALK ) {
2347                         $username = explode( '/', $this->mTitle->getText(), 2 )[0];
2348                         $user = User::newFromName( $username, false /* allow IP users*/ );
2349                         $ip = User::isIP( $username );
2350                         $block = Block::newFromTarget( $user, $user );
2351                         if ( !( $user && $user->isLoggedIn() ) && !$ip ) { # User does not exist
2352                                 $wgOut->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n$1\n</div>",
2353                                         [ 'userpage-userdoesnotexist', wfEscapeWikiText( $username ) ] );
2354                         } elseif ( !is_null( $block ) && $block->getType() != Block::TYPE_AUTO ) {
2355                                 # Show log extract if the user is currently blocked
2356                                 LogEventsList::showLogExtract(
2357                                         $wgOut,
2358                                         'block',
2359                                         MWNamespace::getCanonicalName( NS_USER ) . ':' . $block->getTarget(),
2360                                         '',
2361                                         [
2362                                                 'lim' => 1,
2363                                                 'showIfEmpty' => false,
2364                                                 'msgKey' => [
2365                                                         'blocked-notice-logextract',
2366                                                         $user->getName() # Support GENDER in notice
2367                                                 ]
2368                                         ]
2369                                 );
2370                         }
2371                 }
2372                 # Try to add a custom edit intro, or use the standard one if this is not possible.
2373                 if ( !$this->showCustomIntro() && !$this->mTitle->exists() ) {
2374                         $helpLink = wfExpandUrl( Skin::makeInternalOrExternalUrl(
2375                                 wfMessage( 'helppage' )->inContentLanguage()->text()
2376                         ) );
2377                         if ( $wgUser->isLoggedIn() ) {
2378                                 $wgOut->wrapWikiMsg(
2379                                         // Suppress the external link icon, consider the help url an internal one
2380                                         "<div class=\"mw-newarticletext plainlinks\">\n$1\n</div>",
2381                                         [
2382                                                 'newarticletext',
2383                                                 $helpLink
2384                                         ]
2385                                 );
2386                         } else {
2387                                 $wgOut->wrapWikiMsg(
2388                                         // Suppress the external link icon, consider the help url an internal one
2389                                         "<div class=\"mw-newarticletextanon plainlinks\">\n$1\n</div>",
2390                                         [
2391                                                 'newarticletextanon',
2392                                                 $helpLink
2393                                         ]
2394                                 );
2395                         }
2396                 }
2397                 # Give a notice if the user is editing a deleted/moved page...
2398                 if ( !$this->mTitle->exists() ) {
2399                         LogEventsList::showLogExtract( $wgOut, [ 'delete', 'move' ], $this->mTitle,
2400                                 '',
2401                                 [
2402                                         'lim' => 10,
2403                                         'conds' => [ "log_action != 'revision'" ],
2404                                         'showIfEmpty' => false,
2405                                         'msgKey' => [ 'recreate-moveddeleted-warn' ]
2406                                 ]
2407                         );
2408                 }
2409         }
2410
2411         /**
2412          * Attempt to show a custom editing introduction, if supplied
2413          *
2414          * @return bool
2415          */
2416         protected function showCustomIntro() {
2417                 if ( $this->editintro ) {
2418                         $title = Title::newFromText( $this->editintro );
2419                         if ( $title instanceof Title && $title->exists() && $title->userCan( 'read' ) ) {
2420                                 global $wgOut;
2421                                 // Added using template syntax, to take <noinclude>'s into account.
2422                                 $wgOut->addWikiTextTitleTidy(
2423                                         '<div class="mw-editintro">{{:' . $title->getFullText() . '}}</div>',
2424                                         $this->mTitle
2425                                 );
2426                                 return true;
2427                         }
2428                 }
2429                 return false;
2430         }
2431
2432         /**
2433          * Gets an editable textual representation of $content.
2434          * The textual representation can be turned by into a Content object by the
2435          * toEditContent() method.
2436          *
2437          * If $content is null or false or a string, $content is returned unchanged.
2438          *
2439          * If the given Content object is not of a type that can be edited using
2440          * the text base EditPage, an exception will be raised. Set
2441          * $this->allowNonTextContent to true to allow editing of non-textual
2442          * content.
2443          *
2444          * @param Content|null|bool|string $content
2445          * @return string The editable text form of the content.
2446          *
2447          * @throws MWException If $content is not an instance of TextContent and
2448          *   $this->allowNonTextContent is not true.
2449          */
2450         protected function toEditText( $content ) {
2451                 if ( $content === null || $content === false || is_string( $content ) ) {
2452                         return $content;
2453                 }
2454
2455                 if ( !$this->isSupportedContentModel( $content->getModel() ) ) {
2456                         throw new MWException( 'This content model is not supported: '
2457                                 . ContentHandler::getLocalizedName( $content->getModel() ) );
2458                 }
2459
2460                 return $content->serialize( $this->contentFormat );
2461         }
2462
2463         /**
2464          * Turns the given text into a Content object by unserializing it.
2465          *
2466          * If the resulting Content object is not of a type that can be edited using
2467          * the text base EditPage, an exception will be raised. Set
2468          * $this->allowNonTextContent to true to allow editing of non-textual
2469          * content.
2470          *
2471          * @param string|null|bool $text Text to unserialize
2472          * @return Content The content object created from $text. If $text was false
2473          *   or null, false resp. null will be  returned instead.
2474          *
2475          * @throws MWException If unserializing the text results in a Content
2476          *   object that is not an instance of TextContent and
2477          *   $this->allowNonTextContent is not true.
2478          */
2479         protected function toEditContent( $text ) {
2480                 if ( $text === false || $text === null ) {
2481                         return $text;
2482                 }
2483
2484                 $content = ContentHandler::makeContent( $text, $this->getTitle(),
2485                         $this->contentModel, $this->contentFormat );
2486
2487                 if ( !$this->isSupportedContentModel( $content->getModel() ) ) {
2488                         throw new MWException( 'This content model is not supported: '
2489                                 . ContentHandler::getLocalizedName( $content->getModel() ) );
2490                 }
2491
2492                 return $content;
2493         }
2494
2495         /**
2496          * Send the edit form and related headers to $wgOut
2497          * @param callable|null $formCallback That takes an OutputPage parameter; will be called
2498          *     during form output near the top, for captchas and the like.
2499          *
2500          * The $formCallback parameter is deprecated since MediaWiki 1.25. Please
2501          * use the EditPage::showEditForm:fields hook instead.
2502          */
2503         function showEditForm( $formCallback = null ) {
2504                 global $wgOut, $wgUser;
2505
2506                 # need to parse the preview early so that we know which templates are used,
2507                 # otherwise users with "show preview after edit box" will get a blank list
2508                 # we parse this near the beginning so that setHeaders can do the title
2509                 # setting work instead of leaving it in getPreviewText
2510                 $previewOutput = '';
2511                 if ( $this->formtype == 'preview' ) {
2512                         $previewOutput = $this->getPreviewText();
2513                 }
2514
2515                 Hooks::run( 'EditPage::showEditForm:initial', [ &$this, &$wgOut ] );
2516
2517                 $this->setHeaders();
2518
2519                 if ( $this->showHeader() === false ) {
2520                         return;
2521                 }
2522
2523                 $wgOut->addHTML( $this->editFormPageTop );
2524
2525                 if ( $wgUser->getOption( 'previewontop' ) ) {
2526                         $this->displayPreviewArea( $previewOutput, true );
2527                 }
2528
2529                 $wgOut->addHTML( $this->editFormTextTop );
2530
2531                 $showToolbar = true;
2532                 if ( $this->wasDeletedSinceLastEdit() ) {
2533                         if ( $this->formtype == 'save' ) {
2534                                 // Hide the toolbar and edit area, user can click preview to get it back
2535                                 // Add an confirmation checkbox and explanation.
2536                                 $showToolbar = false;
2537                         } else {
2538                                 $wgOut->wrapWikiMsg( "<div class='error mw-deleted-while-editing'>\n$1\n</div>",
2539                                         'deletedwhileediting' );
2540                         }
2541                 }
2542
2543                 // @todo add EditForm plugin interface and use it here!
2544                 //       search for textarea1 and textares2, and allow EditForm to override all uses.
2545                 $wgOut->addHTML( Html::openElement(
2546                         'form',
2547                         [
2548                                 'id' => self::EDITFORM_ID,
2549                                 'name' => self::EDITFORM_ID,
2550                                 'method' => 'post',
2551                                 'action' => $this->getActionURL( $this->getContextTitle() ),
2552                                 'enctype' => 'multipart/form-data'
2553                         ]
2554                 ) );
2555
2556                 if ( is_callable( $formCallback ) ) {
2557                         wfWarn( 'The $formCallback parameter to ' . __METHOD__ . 'is deprecated' );
2558                         call_user_func_array( $formCallback, [ &$wgOut ] );
2559                 }
2560
2561                 // Add an empty field to trip up spambots
2562                 $wgOut->addHTML(
2563                         Xml::openElement( 'div', [ 'id' => 'antispam-container', 'style' => 'display: none;' ] )
2564                         . Html::rawElement(
2565                                 'label',
2566                                 [ 'for' => 'wpAntispam' ],
2567                                 wfMessage( 'simpleantispam-label' )->parse()
2568                         )
2569                         . Xml::element(
2570                                 'input',
2571                                 [
2572                                         'type' => 'text',
2573                                         'name' => 'wpAntispam',
2574                                         'id' => 'wpAntispam',
2575                                         'value' => ''
2576                                 ]
2577                         )
2578                         . Xml::closeElement( 'div' )
2579                 );
2580
2581                 Hooks::run( 'EditPage::showEditForm:fields', [ &$this, &$wgOut ] );
2582
2583                 // Put these up at the top to ensure they aren't lost on early form submission
2584                 $this->showFormBeforeText();
2585
2586                 if ( $this->wasDeletedSinceLastEdit() && 'save' == $this->formtype ) {
2587                         $username = $this->lastDelete->user_name;
2588                         $comment = $this->lastDelete->log_comment;
2589
2590                         // It is better to not parse the comment at all than to have templates expanded in the middle
2591                         // TODO: can the checkLabel be moved outside of the div so that wrapWikiMsg could be used?
2592                         $key = $comment === ''
2593                                 ? 'confirmrecreate-noreason'
2594                                 : 'confirmrecreate';
2595                         $wgOut->addHTML(
2596                                 '<div class="mw-confirm-recreate">' .
2597                                         wfMessage( $key, $username, "<nowiki>$comment</nowiki>" )->parse() .
2598                                 Xml::checkLabel( wfMessage( 'recreate' )->text(), 'wpRecreate', 'wpRecreate', false,
2599                                         [ 'title' => Linker::titleAttrib( 'recreate' ), 'tabindex' => 1, 'id' => 'wpRecreate' ]
2600                                 ) .
2601                                 '</div>'
2602                         );
2603                 }
2604
2605                 # When the summary is hidden, also hide them on preview/show changes
2606                 if ( $this->nosummary ) {
2607                         $wgOut->addHTML( Html::hidden( 'nosummary', true ) );
2608                 }
2609
2610                 # If a blank edit summary was previously provided, and the appropriate
2611                 # user preference is active, pass a hidden tag as wpIgnoreBlankSummary. This will stop the
2612                 # user being bounced back more than once in the event that a summary
2613                 # is not required.
2614                 # ####
2615                 # For a bit more sophisticated detection of blank summaries, hash the
2616                 # automatic one and pass that in the hidden field wpAutoSummary.
2617                 if ( $this->missingSummary || ( $this->section == 'new' && $this->nosummary ) ) {
2618                         $wgOut->addHTML( Html::hidden( 'wpIgnoreBlankSummary', true ) );
2619                 }
2620
2621                 if ( $this->undidRev ) {
2622                         $wgOut->addHTML( Html::hidden( 'wpUndidRevision', $this->undidRev ) );
2623                 }
2624
2625                 if ( $this->selfRedirect ) {
2626                         $wgOut->addHTML( Html::hidden( 'wpIgnoreSelfRedirect', true ) );
2627                 }
2628
2629                 if ( $this->hasPresetSummary ) {
2630                         // If a summary has been preset using &summary= we don't want to prompt for
2631                         // a different summary. Only prompt for a summary if the summary is blanked.
2632                         // (Bug 17416)
2633                         $this->autoSumm = md5( '' );
2634                 }
2635
2636                 $autosumm = $this->autoSumm ? $this->autoSumm : md5( $this->summary );
2637                 $wgOut->addHTML( Html::hidden( 'wpAutoSummary', $autosumm ) );
2638
2639                 $wgOut->addHTML( Html::hidden( 'oldid', $this->oldid ) );
2640                 $wgOut->addHTML( Html::hidden( 'parentRevId', $this->getParentRevId() ) );
2641
2642                 $wgOut->addHTML( Html::hidden( 'format', $this->contentFormat ) );
2643                 $wgOut->addHTML( Html::hidden( 'model', $this->contentModel ) );
2644
2645                 if ( $this->section == 'new' ) {
2646                         $this->showSummaryInput( true, $this->summary );
2647                         $wgOut->addHTML( $this->getSummaryPreview( true, $this->summary ) );
2648                 }
2649
2650                 $wgOut->addHTML( $this->editFormTextBeforeContent );
2651
2652                 if ( !$this->isCssJsSubpage && $showToolbar && $wgUser->getOption( 'showtoolbar' ) ) {
2653                         $wgOut->addHTML( EditPage::getEditToolbar( $this->mTitle ) );
2654                 }
2655
2656                 if ( $this->blankArticle ) {
2657                         $wgOut->addHTML( Html::hidden( 'wpIgnoreBlankArticle', true ) );
2658                 }
2659
2660                 if ( $this->isConflict ) {
2661                         // In an edit conflict bypass the overridable content form method
2662                         // and fallback to the raw wpTextbox1 since editconflicts can't be
2663                         // resolved between page source edits and custom ui edits using the
2664                         // custom edit ui.
2665                         $this->textbox2 = $this->textbox1;
2666
2667                         $content = $this->getCurrentContent();
2668                         $this->textbox1 = $this->toEditText( $content );
2669
2670                         $this->showTextbox1();
2671                 } else {
2672                         $this->showContentForm();
2673                 }
2674
2675                 $wgOut->addHTML( $this->editFormTextAfterContent );
2676
2677                 $this->showStandardInputs();
2678
2679                 $this->showFormAfterText();
2680
2681                 $this->showTosSummary();
2682
2683                 $this->showEditTools();
2684
2685                 $wgOut->addHTML( $this->editFormTextAfterTools . "\n" );
2686
2687                 $wgOut->addHTML( Html::rawElement( 'div', [ 'class' => 'templatesUsed' ],
2688                         Linker::formatTemplates( $this->getTemplates(), $this->preview, $this->section != '' ) ) );
2689
2690                 $wgOut->addHTML( Html::rawElement( 'div', [ 'class' => 'hiddencats' ],
2691                         Linker::formatHiddenCategories( $this->page->getHiddenCategories() ) ) );
2692
2693                 $wgOut->addHTML( Html::rawElement( 'div', [ 'class' => 'limitreport' ],
2694                         self::getPreviewLimitReport( $this->mParserOutput ) ) );
2695
2696                 $wgOut->addModules( 'mediawiki.action.edit.collapsibleFooter' );
2697
2698                 if ( $this->isConflict ) {
2699                         try {
2700                                 $this->showConflict();
2701                         } catch ( MWContentSerializationException $ex ) {
2702                                 // this can't really happen, but be nice if it does.
2703                                 $msg = wfMessage(
2704                                         'content-failed-to-parse',
2705                                         $this->contentModel,
2706                                         $this->contentFormat,
2707                                         $ex->getMessage()
2708                                 );
2709                                 $wgOut->addWikiText( '<div class="error">' . $msg->text() . '</div>' );
2710                         }
2711                 }
2712
2713                 // Set a hidden field so JS knows what edit form mode we are in
2714                 if ( $this->isConflict ) {
2715                         $mode = 'conflict';
2716                 } elseif ( $this->preview ) {
2717                         $mode = 'preview';
2718                 } elseif ( $this->diff ) {
2719                         $mode = 'diff';
2720                 } else {
2721                         $mode = 'text';
2722                 }
2723                 $wgOut->addHTML( Html::hidden( 'mode', $mode, [ 'id' => 'mw-edit-mode' ] ) );
2724
2725                 // Marker for detecting truncated form data.  This must be the last
2726                 // parameter sent in order to be of use, so do not move me.
2727                 $wgOut->addHTML( Html::hidden( 'wpUltimateParam', true ) );
2728                 $wgOut->addHTML( $this->editFormTextBottom . "\n</form>\n" );
2729
2730                 if ( !$wgUser->getOption( 'previewontop' ) ) {
2731                         $this->displayPreviewArea( $previewOutput, false );
2732                 }
2733
2734         }
2735
2736         /**
2737          * Extract the section title from current section text, if any.
2738          *
2739          * @param string $text
2740          * @return string|bool String or false
2741          */
2742         public static function extractSectionTitle( $text ) {
2743                 preg_match( "/^(=+)(.+)\\1\\s*(\n|$)/i", $text, $matches );
2744                 if ( !empty( $matches[2] ) ) {
2745                         global $wgParser;
2746                         return $wgParser->stripSectionName( trim( $matches[2] ) );
2747                 } else {
2748                         return false;
2749                 }
2750         }
2751
2752         /**
2753          * @return bool
2754          */
2755         protected function showHeader() {
2756                 global $wgOut, $wgUser, $wgMaxArticleSize, $wgLang;
2757                 global $wgAllowUserCss, $wgAllowUserJs;
2758
2759                 if ( $this->mTitle->isTalkPage() ) {
2760                         $wgOut->addWikiMsg( 'talkpagetext' );
2761                 }
2762
2763                 // Add edit notices
2764                 $editNotices = $this->mTitle->getEditNotices( $this->oldid );
2765                 if ( count( $editNotices ) ) {
2766                         $wgOut->addHTML( implode( "\n", $editNotices ) );
2767                 } else {
2768                         $msg = wfMessage( 'editnotice-notext' );
2769                         if ( !$msg->isDisabled() ) {
2770                                 $wgOut->addHTML(
2771                                         '<div class="mw-editnotice-notext">'
2772                                         . $msg->parseAsBlock()
2773                                         . '</div>'
2774                                 );
2775                         }
2776                 }
2777
2778                 if ( $this->isConflict ) {
2779                         $wgOut->wrapWikiMsg( "<div class='mw-explainconflict'>\n$1\n</div>", 'explainconflict' );
2780                         $this->editRevId = $this->page->getLatest();
2781                 } else {
2782                         if ( $this->section != '' && !$this->isSectionEditSupported() ) {
2783                                 // We use $this->section to much before this and getVal('wgSection') directly in other places
2784                                 // at this point we can't reset $this->section to '' to fallback to non-section editing.
2785                                 // Someone is welcome to try refactoring though
2786                                 $wgOut->showErrorPage( 'sectioneditnotsupported-title', 'sectioneditnotsupported-text' );
2787                                 return false;
2788                         }
2789
2790                         if ( $this->section != '' && $this->section != 'new' ) {
2791                                 if ( !$this->summary && !$this->preview && !$this->diff ) {
2792                                         $sectionTitle = self::extractSectionTitle( $this->textbox1 ); // FIXME: use Content object
2793                                         if ( $sectionTitle !== false ) {
2794                                                 $this->summary = "/* $sectionTitle */ ";
2795                                         }
2796                                 }
2797                         }
2798
2799                         if ( $this->missingComment ) {
2800                                 $wgOut->wrapWikiMsg( "<div id='mw-missingcommenttext'>\n$1\n</div>", 'missingcommenttext' );
2801                         }
2802
2803                         if ( $this->missingSummary && $this->section != 'new' ) {
2804                                 $wgOut->wrapWikiMsg( "<div id='mw-missingsummary'>\n$1\n</div>", 'missingsummary' );
2805                         }
2806
2807                         if ( $this->missingSummary && $this->section == 'new' ) {
2808                                 $wgOut->wrapWikiMsg( "<div id='mw-missingcommentheader'>\n$1\n</div>", 'missingcommentheader' );
2809                         }
2810
2811                         if ( $this->blankArticle ) {
2812                                 $wgOut->wrapWikiMsg( "<div id='mw-blankarticle'>\n$1\n</div>", 'blankarticle' );
2813                         }
2814
2815                         if ( $this->selfRedirect ) {
2816                                 $wgOut->wrapWikiMsg( "<div id='mw-selfredirect'>\n$1\n</div>", 'selfredirect' );
2817                         }
2818
2819                         if ( $this->hookError !== '' ) {
2820                                 $wgOut->addWikiText( $this->hookError );
2821                         }
2822
2823                         if ( !$this->checkUnicodeCompliantBrowser() ) {
2824                                 $wgOut->addWikiMsg( 'nonunicodebrowser' );
2825                         }
2826
2827                         if ( $this->section != 'new' ) {
2828                                 $revision = $this->mArticle->getRevisionFetched();
2829                                 if ( $revision ) {
2830                                         // Let sysop know that this will make private content public if saved
2831
2832                                         if ( !$revision->userCan( Revision::DELETED_TEXT, $wgUser ) ) {
2833                                                 $wgOut->wrapWikiMsg(
2834                                                         "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
2835                                                         'rev-deleted-text-permission'
2836                                                 );
2837                                         } elseif ( $revision->isDeleted( Revision::DELETED_TEXT ) ) {
2838                                                 $wgOut->wrapWikiMsg(
2839                                                         "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
2840                                                         'rev-deleted-text-view'
2841                                                 );
2842                                         }
2843
2844                                         if ( !$revision->isCurrent() ) {
2845                                                 $this->mArticle->setOldSubtitle( $revision->getId() );
2846                                                 $wgOut->addWikiMsg( 'editingold' );
2847                                         }
2848                                 } elseif ( $this->mTitle->exists() ) {
2849                                         // Something went wrong
2850
2851                                         $wgOut->wrapWikiMsg( "<div class='errorbox'>\n$1\n</div>\n",
2852                                                 [ 'missing-revision', $this->oldid ] );
2853                                 }
2854                         }
2855                 }
2856
2857                 if ( wfReadOnly() ) {
2858                         $wgOut->wrapWikiMsg(
2859                                 "<div id=\"mw-read-only-warning\">\n$1\n</div>",
2860                                 [ 'readonlywarning', wfReadOnlyReason() ]
2861                         );
2862                 } elseif ( $wgUser->isAnon() ) {
2863                         if ( $this->formtype != 'preview' ) {
2864                                 $wgOut->wrapWikiMsg(
2865                                         "<div id='mw-anon-edit-warning' class='warningbox'>\n$1\n</div>",
2866                                         [ 'anoneditwarning',
2867                                                 // Log-in link
2868                                                 SpecialPage::getTitleFor( 'Userlogin' )->getFullURL( [
2869                                                         'returnto' => $this->getTitle()->getPrefixedDBkey()
2870                                                 ] ),
2871                                                 // Sign-up link
2872                                                 SpecialPage::getTitleFor( 'CreateAccount' )->getFullURL( [
2873                                                         'returnto' => $this->getTitle()->getPrefixedDBkey()
2874                                                 ] )
2875                                         ]
2876                                 );
2877                         } else {
2878                                 $wgOut->wrapWikiMsg( "<div id=\"mw-anon-preview-warning\" class=\"warningbox\">\n$1</div>",
2879                                         'anonpreviewwarning'
2880                                 );
2881                         }
2882                 } else {
2883                         if ( $this->isCssJsSubpage ) {
2884                                 # Check the skin exists
2885                                 if ( $this->isWrongCaseCssJsPage ) {
2886                                         $wgOut->wrapWikiMsg(
2887                                                 "<div class='error' id='mw-userinvalidcssjstitle'>\n$1\n</div>",
2888                                                 [ 'userinvalidcssjstitle', $this->mTitle->getSkinFromCssJsSubpage() ]
2889                                         );
2890                                 }
2891                                 if ( $this->getTitle()->isSubpageOf( $wgUser->getUserPage() ) ) {
2892                                         if ( $this->formtype !== 'preview' ) {
2893                                                 if ( $this->isCssSubpage && $wgAllowUserCss ) {
2894                                                         $wgOut->wrapWikiMsg(
2895                                                                 "<div id='mw-usercssyoucanpreview'>\n$1\n</div>",
2896                                                                 [ 'usercssyoucanpreview' ]
2897                                                         );
2898                                                 }
2899
2900                                                 if ( $this->isJsSubpage && $wgAllowUserJs ) {
2901                                                         $wgOut->wrapWikiMsg(
2902                                                                 "<div id='mw-userjsyoucanpreview'>\n$1\n</div>",
2903                                                                 [ 'userjsyoucanpreview' ]
2904                                                         );
2905                                                 }
2906                                         }
2907                                 }
2908                         }
2909                 }
2910
2911                 if ( $this->mTitle->isProtected( 'edit' ) &&
2912                         MWNamespace::getRestrictionLevels( $this->mTitle->getNamespace() ) !== [ '' ]
2913                 ) {
2914                         # Is the title semi-protected?
2915                         if ( $this->mTitle->isSemiProtected() ) {
2916                                 $noticeMsg = 'semiprotectedpagewarning';
2917                         } else {
2918                                 # Then it must be protected based on static groups (regular)
2919                                 $noticeMsg = 'protectedpagewarning';
2920                         }
2921                         LogEventsList::showLogExtract( $wgOut, 'protect', $this->mTitle, '',
2922                                 [ 'lim' => 1, 'msgKey' => [ $noticeMsg ] ] );
2923                 }
2924                 if ( $this->mTitle->isCascadeProtected() ) {
2925                         # Is this page under cascading protection from some source pages?
2926                         /** @var Title[] $cascadeSources */
2927                         list( $cascadeSources, /* $restrictions */ ) = $this->mTitle->getCascadeProtectionSources();
2928                         $notice = "<div class='mw-cascadeprotectedwarning'>\n$1\n";
2929                         $cascadeSourcesCount = count( $cascadeSources );
2930                         if ( $cascadeSourcesCount > 0 ) {
2931                                 # Explain, and list the titles responsible
2932                                 foreach ( $cascadeSources as $page ) {
2933                                         $notice .= '* [[:' . $page->getPrefixedText() . "]]\n";
2934                                 }
2935                         }
2936                         $notice .= '</div>';
2937                         $wgOut->wrapWikiMsg( $notice, [ 'cascadeprotectedwarning', $cascadeSourcesCount ] );
2938                 }
2939                 if ( !$this->mTitle->exists() && $this->mTitle->getRestrictions( 'create' ) ) {
2940                         LogEventsList::showLogExtract( $wgOut, 'protect', $this->mTitle, '',
2941                                 [ 'lim' => 1,
2942                                         'showIfEmpty' => false,
2943                                         'msgKey' => [ 'titleprotectedwarning' ],
2944                                         'wrap' => "<div class=\"mw-titleprotectedwarning\">\n$1</div>" ] );
2945                 }
2946
2947                 if ( $this->kblength === false ) {
2948                         $this->kblength = (int)( strlen( $this->textbox1 ) / 1024 );
2949                 }
2950
2951                 if ( $this->tooBig || $this->kblength > $wgMaxArticleSize ) {
2952                         $wgOut->wrapWikiMsg( "<div class='error' id='mw-edit-longpageerror'>\n$1\n</div>",
2953                                 [
2954                                         'longpageerror',
2955                                         $wgLang->formatNum( $this->kblength ),
2956                                         $wgLang->formatNum( $wgMaxArticleSize )
2957                                 ]
2958                         );
2959                 } else {
2960                         if ( !wfMessage( 'longpage-hint' )->isDisabled() ) {
2961                                 $wgOut->wrapWikiMsg( "<div id='mw-edit-longpage-hint'>\n$1\n</div>",
2962                                         [
2963                                                 'longpage-hint',
2964                                                 $wgLang->formatSize( strlen( $this->textbox1 ) ),
2965                                                 strlen( $this->textbox1 )
2966                                         ]
2967                                 );
2968                         }
2969                 }
2970                 # Add header copyright warning
2971                 $this->showHeaderCopyrightWarning();
2972
2973                 return true;
2974         }
2975
2976         /**
2977          * Standard summary input and label (wgSummary), abstracted so EditPage
2978          * subclasses may reorganize the form.
2979          * Note that you do not need to worry about the label's for=, it will be
2980          * inferred by the id given to the input. You can remove them both by
2981          * passing array( 'id' => false ) to $userInputAttrs.
2982          *
2983          * @param string $summary The value of the summary input
2984          * @param string $labelText The html to place inside the label
2985          * @param array $inputAttrs Array of attrs to use on the input
2986          * @param array $spanLabelAttrs Array of attrs to use on the span inside the label
2987          *
2988          * @return array An array in the format array( $label, $input )
2989          */
2990         function getSummaryInput( $summary = "", $labelText = null,
2991                 $inputAttrs = null, $spanLabelAttrs = null
2992         ) {
2993                 // Note: the maxlength is overridden in JS to 255 and to make it use UTF-8 bytes, not characters.
2994                 $inputAttrs = ( is_array( $inputAttrs ) ? $inputAttrs : [] ) + [
2995                         'id' => 'wpSummary',
2996                         'maxlength' => '200',
2997                         'tabindex' => '1',
2998                         'size' => 60,
2999                         'spellcheck' => 'true',
3000                 ] + Linker::tooltipAndAccesskeyAttribs( 'summary' );
3001
3002                 $spanLabelAttrs = ( is_array( $spanLabelAttrs ) ? $spanLabelAttrs : [] ) + [
3003                         'class' => $this->missingSummary ? 'mw-summarymissed' : 'mw-summary',
3004                         'id' => "wpSummaryLabel"
3005                 ];
3006
3007                 $label = null;
3008                 if ( $labelText ) {
3009                         $label = Xml::tags(
3010                                 'label',
3011                                 $inputAttrs['id'] ? [ 'for' => $inputAttrs['id'] ] : null,
3012                                 $labelText
3013                         );
3014                         $label = Xml::tags( 'span', $spanLabelAttrs, $label );
3015                 }
3016
3017                 $input = Html::input( 'wpSummary', $summary, 'text', $inputAttrs );
3018
3019                 return [ $label, $input ];
3020         }
3021
3022         /**
3023          * @param bool $isSubjectPreview True if this is the section subject/title
3024          *   up top, or false if this is the comment summary
3025          *   down below the textarea
3026          * @param string $summary The text of the summary to display
3027          */
3028         protected function showSummaryInput( $isSubjectPreview, $summary = "" ) {
3029                 global $wgOut, $wgContLang;
3030                 # Add a class if 'missingsummary' is triggered to allow styling of the summary line
3031                 $summaryClass = $this->missingSummary ? 'mw-summarymissed' : 'mw-summary';
3032                 if ( $isSubjectPreview ) {
3033                         if ( $this->nosummary ) {
3034                                 return;
3035                         }
3036                 } else {
3037                         if ( !$this->mShowSummaryField ) {
3038                                 return;
3039                         }
3040                 }
3041                 $summary = $wgContLang->recodeForEdit( $summary );
3042                 $labelText = wfMessage( $isSubjectPreview ? 'subject' : 'summary' )->parse();
3043                 list( $label, $input ) = $this->getSummaryInput(
3044                         $summary,
3045                         $labelText,
3046                         [ 'class' => $summaryClass ],
3047                         []
3048                 );
3049                 $wgOut->addHTML( "{$label} {$input}" );
3050         }
3051
3052         /**
3053          * @param bool $isSubjectPreview True if this is the section subject/title
3054          *   up top, or false if this is the comment summary
3055          *   down below the textarea
3056          * @param string $summary The text of the summary to display
3057          * @return string
3058          */
3059         protected function getSummaryPreview( $isSubjectPreview, $summary = "" ) {
3060                 // avoid spaces in preview, gets always trimmed on save
3061                 $summary = trim( $summary );
3062                 if ( !$summary || ( !$this->preview && !$this->diff ) ) {
3063                         return "";
3064                 }
3065
3066                 global $wgParser;
3067
3068                 if ( $isSubjectPreview ) {
3069                         $summary = wfMessage( 'newsectionsummary' )->rawParams( $wgParser->stripSectionName( $summary ) )
3070                                 ->inContentLanguage()->text();
3071                 }
3072
3073                 $message = $isSubjectPreview ? 'subject-preview' : 'summary-preview';
3074
3075                 $summary = wfMessage( $message )->parse()
3076                         . Linker::commentBlock( $summary, $this->mTitle, $isSubjectPreview );
3077                 return Xml::tags( 'div', [ 'class' => 'mw-summary-preview' ], $summary );
3078         }
3079
3080         protected function showFormBeforeText() {
3081                 global $wgOut;
3082                 $section = htmlspecialchars( $this->section );
3083                 $wgOut->addHTML( <<<HTML
3084 <input type='hidden' value="{$section}" name="wpSection"/>
3085 <input type='hidden' value="{$this->starttime}" name="wpStarttime" />
3086 <input type='hidden' value="{$this->edittime}" name="wpEdittime" />
3087 <input type='hidden' value="{$this->editRevId}" name="editRevId" />
3088 <input type='hidden' value="{$this->scrolltop}" name="wpScrolltop" id="wpScrolltop" />
3089
3090 HTML
3091                 );
3092                 if ( !$this->checkUnicodeCompliantBrowser() ) {
3093                         $wgOut->addHTML( Html::hidden( 'safemode', '1' ) );
3094                 }
3095         }
3096
3097         protected function showFormAfterText() {
3098                 global $wgOut, $wgUser;
3099                 /**
3100                  * To make it harder for someone to slip a user a page
3101                  * which submits an edit form to the wiki without their
3102                  * knowledge, a random token is associated with the login
3103                  * session. If it's not passed back with the submission,
3104                  * we won't save the page, or render user JavaScript and
3105                  * CSS previews.
3106                  *
3107                  * For anon editors, who may not have a session, we just
3108                  * include the constant suffix to prevent editing from
3109                  * broken text-mangling proxies.
3110                  */
3111                 $wgOut->addHTML( "\n" . Html::hidden( "wpEditToken", $wgUser->getEditToken() ) . "\n" );
3112         }
3113
3114         /**
3115          * Subpage overridable method for printing the form for page content editing
3116          * By default this simply outputs wpTextbox1
3117          * Subclasses can override this to provide a custom UI for editing;
3118          * be it a form, or simply wpTextbox1 with a modified content that will be
3119          * reverse modified when extracted from the post data.
3120          * Note that this is basically the inverse for importContentFormData
3121          */
3122         protected function showContentForm() {
3123                 $this->showTextbox1();
3124         }
3125
3126         /**
3127          * Method to output wpTextbox1
3128          * The $textoverride method can be used by subclasses overriding showContentForm
3129          * to pass back to this method.
3130          *
3131          * @param array $customAttribs Array of html attributes to use in the textarea
3132          * @param string $textoverride Optional text to override $this->textarea1 with
3133          */
3134         protected function showTextbox1( $customAttribs = null, $textoverride = null ) {
3135                 if ( $this->wasDeletedSinceLastEdit() && $this->formtype == 'save' ) {
3136                         $attribs = [ 'style' => 'display:none;' ];
3137                 } else {
3138                         $classes = []; // Textarea CSS
3139                         if ( $this->mTitle->isProtected( 'edit' ) &&
3140                                 MWNamespace::getRestrictionLevels( $this->mTitle->getNamespace() ) !== [ '' ]
3141                         ) {
3142                                 # Is the title semi-protected?
3143                                 if ( $this->mTitle->isSemiProtected() ) {
3144                                         $classes[] = 'mw-textarea-sprotected';
3145                                 } else {
3146                                         # Then it must be protected based on static groups (regular)
3147                                         $classes[] = 'mw-textarea-protected';
3148                                 }
3149                                 # Is the title cascade-protected?
3150                                 if ( $this->mTitle->isCascadeProtected() ) {
3151                                         $classes[] = 'mw-textarea-cprotected';
3152                                 }
3153                         }
3154
3155                         $attribs = [ 'tabindex' => 1 ];
3156
3157                         if ( is_array( $customAttribs ) ) {
3158                                 $attribs += $customAttribs;
3159                         }
3160
3161                         if ( count( $classes ) ) {
3162                                 if ( isset( $attribs['class'] ) ) {
3163                                         $classes[] = $attribs['class'];
3164                                 }
3165                                 $attribs['class'] = implode( ' ', $classes );
3166                         }
3167                 }
3168
3169                 $this->showTextbox(
3170                         $textoverride !== null ? $textoverride : $this->textbox1,
3171                         'wpTextbox1',
3172                         $attribs
3173                 );
3174         }
3175
3176         protected function showTextbox2() {
3177                 $this->showTextbox( $this->textbox2, 'wpTextbox2', [ 'tabindex' => 6, 'readonly' ] );
3178         }
3179
3180         protected function showTextbox( $text, $name, $customAttribs = [] ) {
3181                 global $wgOut, $wgUser;
3182
3183                 $wikitext = $this->safeUnicodeOutput( $text );
3184                 if ( strval( $wikitext ) !== '' ) {
3185                         // Ensure there's a newline at the end, otherwise adding lines
3186                         // is awkward.
3187                         // But don't add a newline if the ext is empty, or Firefox in XHTML
3188                         // mode will show an extra newline. A bit annoying.
3189                         $wikitext .= "\n";
3190                 }
3191
3192                 $attribs = $customAttribs + [
3193                         'accesskey' => ',',
3194                         'id' => $name,
3195                         'cols' => $wgUser->getIntOption( 'cols' ),
3196                         'rows' => $wgUser->getIntOption( 'rows' ),
3197                         // Avoid PHP notices when appending preferences
3198                         // (appending allows customAttribs['style'] to still work).
3199                         'style' => ''
3200                 ];
3201
3202                 $pageLang = $this->mTitle->getPageLanguage();
3203                 $attribs['lang'] = $pageLang->getHtmlCode();
3204                 $attribs['dir'] = $pageLang->getDir();
3205
3206                 $wgOut->addHTML( Html::textarea( $name, $wikitext, $attribs ) );
3207         }
3208
3209         protected function displayPreviewArea( $previewOutput, $isOnTop = false ) {
3210                 global $wgOut;
3211                 $classes = [];
3212                 if ( $isOnTop ) {
3213                         $classes[] = 'ontop';
3214                 }
3215
3216                 $attribs = [ 'id' => 'wikiPreview', 'class' => implode( ' ', $classes ) ];
3217
3218                 if ( $this->formtype != 'preview' ) {
3219                         $attribs['style'] = 'display: none;';
3220                 }
3221
3222                 $wgOut->addHTML( Xml::openElement( 'div', $attribs ) );
3223
3224                 if ( $this->formtype == 'preview' ) {
3225                         $this->showPreview( $previewOutput );
3226                 } else {
3227                         // Empty content container for LivePreview
3228                         $pageViewLang = $this->mTitle->getPageViewLanguage();
3229                         $attribs = [ 'lang' => $pageViewLang->getHtmlCode(), 'dir' => $pageViewLang->getDir(),
3230                                 'class' => 'mw-content-' . $pageViewLang->getDir() ];
3231                         $wgOut->addHTML( Html::rawElement( 'div', $attribs ) );
3232                 }
3233
3234                 $wgOut->addHTML( '</div>' );
3235
3236                 if ( $this->formtype == 'diff' ) {
3237                         try {
3238                                 $this->showDiff();
3239                         } catch ( MWContentSerializationException $ex ) {
3240                                 $msg = wfMessage(
3241                                         'content-failed-to-parse',
3242                                         $this->contentModel,
3243                                         $this->contentFormat,
3244                                         $ex->getMessage()
3245                                 );
3246                                 $wgOut->addWikiText( '<div class="error">' . $msg->text() . '</div>' );
3247                         }
3248                 }
3249         }
3250
3251         /**
3252          * Append preview output to $wgOut.
3253          * Includes category rendering if this is a category page.
3254          *
3255          * @param string $text The HTML to be output for the preview.
3256          */
3257         protected function showPreview( $text ) {
3258                 global $wgOut;
3259                 if ( $this->mTitle->getNamespace() == NS_CATEGORY ) {
3260                         $this->mArticle->openShowCategory();
3261                 }
3262                 # This hook seems slightly odd here, but makes things more
3263                 # consistent for extensions.
3264                 Hooks::run( 'OutputPageBeforeHTML', [ &$wgOut, &$text ] );
3265                 $wgOut->addHTML( $text );
3266                 if ( $this->mTitle->getNamespace() == NS_CATEGORY ) {
3267                         $this->mArticle->closeShowCategory();
3268                 }
3269         }
3270
3271         /**
3272          * Get a diff between the current contents of the edit box and the
3273          * version of the page we're editing from.
3274          *
3275          * If this is a section edit, we'll replace the section as for final
3276          * save and then make a comparison.
3277          */
3278         function showDiff() {
3279                 global $wgUser, $wgContLang, $wgOut;
3280
3281                 $oldtitlemsg = 'currentrev';
3282                 # if message does not exist, show diff against the preloaded default
3283                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI && !$this->mTitle->exists() ) {
3284                         $oldtext = $this->mTitle->getDefaultMessageText();
3285                         if ( $oldtext !== false ) {
3286                                 $oldtitlemsg = 'defaultmessagetext';
3287                                 $oldContent = $this->toEditContent( $oldtext );
3288                         } else {
3289                                 $oldContent = null;
3290                         }
3291                 } else {
3292                         $oldContent = $this->getCurrentContent();
3293                 }
3294
3295                 $textboxContent = $this->toEditContent( $this->textbox1 );
3296                 if ( $this->editRevId !== null ) {
3297                         $newContent = $this->page->replaceSectionAtRev(
3298                                 $this->section, $textboxContent, $this->summary, $this->editRevId
3299                         );
3300                 } else {
3301                         $newContent = $this->page->replaceSectionContent(
3302                                 $this->section, $textboxContent, $this->summary, $this->edittime
3303                         );
3304                 }
3305
3306                 if ( $newContent ) {
3307                         ContentHandler::runLegacyHooks( 'EditPageGetDiffText', [ $this, &$newContent ] );
3308                         Hooks::run( 'EditPageGetDiffContent', [ $this, &$newContent ] );
3309
3310                         $popts = ParserOptions::newFromUserAndLang( $wgUser, $wgContLang );
3311                         $newContent = $newContent->preSaveTransform( $this->mTitle, $wgUser, $popts );
3312                 }
3313
3314                 if ( ( $oldContent && !$oldContent->isEmpty() ) || ( $newContent && !$newContent->isEmpty() ) ) {
3315                         $oldtitle = wfMessage( $oldtitlemsg )->parse();
3316                         $newtitle = wfMessage( 'yourtext' )->parse();
3317
3318                         if ( !$oldContent ) {
3319                                 $oldContent = $newContent->getContentHandler()->makeEmptyContent();
3320                         }
3321
3322                         if ( !$newContent ) {
3323                                 $newContent = $oldContent->getContentHandler()->makeEmptyContent();
3324                         }
3325
3326                         $de = $oldContent->getContentHandler()->createDifferenceEngine( $this->mArticle->getContext() );
3327                         $de->setContent( $oldContent, $newContent );
3328
3329                         $difftext = $de->getDiff( $oldtitle, $newtitle );
3330                         $de->showDiffStyle();
3331                 } else {
3332                         $difftext = '';
3333                 }
3334
3335                 $wgOut->addHTML( '<div id="wikiDiff">' . $difftext . '</div>' );
3336         }
3337
3338         /**
3339          * Show the header copyright warning.
3340          */
3341         protected function showHeaderCopyrightWarning() {
3342                 $msg = 'editpage-head-copy-warn';
3343                 if ( !wfMessage( $msg )->isDisabled() ) {
3344                         global $wgOut;
3345                         $wgOut->wrapWikiMsg( "<div class='editpage-head-copywarn'>\n$1\n</div>",
3346                                 'editpage-head-copy-warn' );
3347                 }
3348         }
3349
3350         /**
3351          * Give a chance for site and per-namespace customizations of
3352          * terms of service summary link that might exist separately
3353          * from the copyright notice.
3354          *
3355          * This will display between the save button and the edit tools,
3356          * so should remain short!
3357          */
3358         protected function showTosSummary() {
3359                 $msg = 'editpage-tos-summary';
3360                 Hooks::run( 'EditPageTosSummary', [ $this->mTitle, &$msg ] );
3361                 if ( !wfMessage( $msg )->isDisabled() ) {
3362                         global $wgOut;
3363                         $wgOut->addHTML( '<div class="mw-tos-summary">' );
3364                         $wgOut->addWikiMsg( $msg );
3365                         $wgOut->addHTML( '</div>' );
3366                 }
3367         }
3368
3369         protected function showEditTools() {
3370                 global $wgOut;
3371                 $wgOut->addHTML( '<div class="mw-editTools">' .
3372                         wfMessage( 'edittools' )->inContentLanguage()->parse() .
3373                         '</div>' );
3374         }
3375
3376         /**
3377          * Get the copyright warning
3378          *
3379          * Renamed to getCopyrightWarning(), old name kept around for backwards compatibility
3380          * @return string
3381          */
3382         protected function getCopywarn() {
3383                 return self::getCopyrightWarning( $this->mTitle );
3384         }
3385
3386         /**
3387          * Get the copyright warning, by default returns wikitext
3388          *
3389          * @param Title $title
3390          * @param string $format Output format, valid values are any function of a Message object
3391          * @return string
3392          */
3393         public static function getCopyrightWarning( $title, $format = 'plain' ) {
3394                 global $wgRightsText;
3395                 if ( $wgRightsText ) {
3396                         $copywarnMsg = [ 'copyrightwarning',
3397                                 '[[' . wfMessage( 'copyrightpage' )->inContentLanguage()->text() . ']]',
3398                                 $wgRightsText ];
3399                 } else {
3400                         $copywarnMsg = [ 'copyrightwarning2',
3401                                 '[[' . wfMessage( 'copyrightpage' )->inContentLanguage()->text() . ']]' ];
3402                 }
3403                 // Allow for site and per-namespace customization of contribution/copyright notice.
3404                 Hooks::run( 'EditPageCopyrightWarning', [ $title, &$copywarnMsg ] );
3405
3406                 return "<div id=\"editpage-copywarn\">\n" .
3407                         call_user_func_array( 'wfMessage', $copywarnMsg )->$format() . "\n</div>";
3408         }
3409
3410         /**
3411          * Get the Limit report for page previews
3412          *
3413          * @since 1.22
3414          * @param ParserOutput $output ParserOutput object from the parse
3415          * @return string HTML
3416          */
3417         public static function getPreviewLimitReport( $output ) {
3418                 if ( !$output || !$output->getLimitReportData() ) {
3419                         return '';
3420                 }
3421
3422                 $limitReport = Html::rawElement( 'div', [ 'class' => 'mw-limitReportExplanation' ],
3423                         wfMessage( 'limitreport-title' )->parseAsBlock()
3424                 );
3425
3426                 // Show/hide animation doesn't work correctly on a table, so wrap it in a div.
3427                 $limitReport .= Html::openElement( 'div', [ 'class' => 'preview-limit-report-wrapper' ] );
3428
3429                 $limitReport .= Html::openElement( 'table', [
3430                         'class' => 'preview-limit-report wikitable'
3431                 ] ) .
3432                         Html::openElement( 'tbody' );
3433
3434                 foreach ( $output->getLimitReportData() as $key => $value ) {
3435                         if ( Hooks::run( 'ParserLimitReportFormat',
3436                                 [ $key, &$value, &$limitReport, true, true ]
3437                         ) ) {
3438                                 $keyMsg = wfMessage( $key );
3439                                 $valueMsg = wfMessage( [ "$key-value-html", "$key-value" ] );
3440                                 if ( !$valueMsg->exists() ) {
3441                                         $valueMsg = new RawMessage( '$1' );
3442                                 }
3443                                 if ( !$keyMsg->isDisabled() && !$valueMsg->isDisabled() ) {
3444                                         $limitReport .= Html::openElement( 'tr' ) .
3445                                                 Html::rawElement( 'th', null, $keyMsg->parse() ) .
3446                                                 Html::rawElement( 'td', null, $valueMsg->params( $value )->parse() ) .
3447                                                 Html::closeElement( 'tr' );
3448                                 }
3449                         }
3450                 }
3451
3452                 $limitReport .= Html::closeElement( 'tbody' ) .
3453                         Html::closeElement( 'table' ) .
3454                         Html::closeElement( 'div' );
3455
3456                 return $limitReport;
3457         }
3458
3459         protected function showStandardInputs( &$tabindex = 2 ) {
3460                 global $wgOut;
3461                 $wgOut->addHTML( "<div class='editOptions'>\n" );
3462
3463                 if ( $this->section != 'new' ) {
3464                         $this->showSummaryInput( false, $this->summary );
3465                         $wgOut->addHTML( $this->getSummaryPreview( false, $this->summary ) );
3466                 }
3467
3468                 $checkboxes = $this->getCheckboxes( $tabindex,
3469                         [ 'minor' => $this->minoredit, 'watch' => $this->watchthis ] );
3470                 $wgOut->addHTML( "<div class='editCheckboxes'>" . implode( $checkboxes, "\n" ) . "</div>\n" );
3471
3472                 // Show copyright warning.
3473                 $wgOut->addWikiText( $this->getCopywarn() );
3474                 $wgOut->addHTML( $this->editFormTextAfterWarn );
3475
3476                 $wgOut->addHTML( "<div class='editButtons'>\n" );
3477                 $wgOut->addHTML( implode( $this->getEditButtons( $tabindex ), "\n" ) . "\n" );
3478
3479                 $cancel = $this->getCancelLink();
3480                 if ( $cancel !== '' ) {
3481                         $cancel .= Html::element( 'span',
3482                                 [ 'class' => 'mw-editButtons-pipe-separator' ],
3483                                 wfMessage( 'pipe-separator' )->text() );
3484                 }
3485
3486                 $message = wfMessage( 'edithelppage' )->inContentLanguage()->text();
3487                 $edithelpurl = Skin::makeInternalOrExternalUrl( $message );
3488                 $attrs = [
3489                         'target' => 'helpwindow',
3490                         'href' => $edithelpurl,
3491                 ];
3492                 $edithelp = Html::linkButton( wfMessage( 'edithelp' )->text(),
3493                         $attrs, [ 'mw-ui-quiet' ] ) .
3494                         wfMessage( 'word-separator' )->escaped() .
3495                         wfMessage( 'newwindow' )->parse();
3496
3497                 $wgOut->addHTML( "      <span class='cancelLink'>{$cancel}</span>\n" );
3498                 $wgOut->addHTML( "      <span class='editHelp'>{$edithelp}</span>\n" );
3499                 $wgOut->addHTML( "</div><!-- editButtons -->\n" );
3500
3501                 Hooks::run( 'EditPage::showStandardInputs:options', [ $this, $wgOut, &$tabindex ] );
3502
3503                 $wgOut->addHTML( "</div><!-- editOptions -->\n" );
3504         }
3505
3506         /**
3507          * Show an edit conflict. textbox1 is already shown in showEditForm().
3508          * If you want to use another entry point to this function, be careful.
3509          */
3510         protected function showConflict() {
3511                 global $wgOut;
3512
3513                 if ( Hooks::run( 'EditPageBeforeConflictDiff', [ &$this, &$wgOut ] ) ) {
3514                         $stats = $wgOut->getContext()->getStats();
3515                         $stats->increment( 'edit.failures.conflict' );
3516                         if ( $this->mTitle->isTalkPage() ) {
3517                                 $stats->increment( 'edit.failures.conflict.byType.talk' );
3518                         } else {
3519                                 $stats->increment( 'edit.failures.conflict.byType.subject' );
3520                         }
3521                         if ( $this->mTitle->getNamespace() === NS_PROJECT ) {
3522                                 $stats->increment( 'edit.failures.conflict.byNamespace.project' );
3523                         }
3524
3525                         $wgOut->wrapWikiMsg( '<h2>$1</h2>', "yourdiff" );
3526
3527                         $content1 = $this->toEditContent( $this->textbox1 );
3528                         $content2 = $this->toEditContent( $this->textbox2 );
3529
3530                         $handler = ContentHandler::getForModelID( $this->contentModel );
3531                         $de = $handler->createDifferenceEngine( $this->mArticle->getContext() );
3532                         $de->setContent( $content2, $content1 );
3533                         $de->showDiff(
3534                                 wfMessage( 'yourtext' )->parse(),
3535                                 wfMessage( 'storedversion' )->text()
3536                         );
3537
3538                         $wgOut->wrapWikiMsg( '<h2>$1</h2>', "yourtext" );
3539                         $this->showTextbox2();
3540                 }
3541         }
3542
3543         /**
3544          * @return string
3545          */
3546         public function getCancelLink() {
3547                 $cancelParams = [];
3548                 if ( !$this->isConflict && $this->oldid > 0 ) {
3549                         $cancelParams['oldid'] = $this->oldid;
3550                 } elseif ( $this->getContextTitle()->isRedirect() ) {
3551                         $cancelParams['redirect'] = 'no';
3552                 }
3553                 $attrs = [ 'id' => 'mw-editform-cancel' ];
3554
3555                 return Linker::linkKnown(
3556                         $this->getContextTitle(),
3557                         wfMessage( 'cancel' )->parse(),
3558                         Html::buttonAttributes( $attrs, [ 'mw-ui-quiet' ] ),
3559                         $cancelParams
3560                 );
3561         }
3562
3563         /**
3564          * Returns the URL to use in the form's action attribute.
3565          * This is used by EditPage subclasses when simply customizing the action
3566          * variable in the constructor is not enough. This can be used when the
3567          * EditPage lives inside of a Special page rather than a custom page action.
3568          *
3569          * @param Title $title Title object for which is being edited (where we go to for &action= links)
3570          * @return string
3571          */
3572         protected function getActionURL( Title $title ) {
3573                 return $title->getLocalURL( [ 'action' => $this->action ] );
3574         }
3575
3576         /**
3577          * Check if a page was deleted while the user was editing it, before submit.
3578          * Note that we rely on the logging table, which hasn't been always there,
3579          * but that doesn't matter, because this only applies to brand new
3580          * deletes.
3581          * @return bool
3582          */
3583         protected function wasDeletedSinceLastEdit() {
3584                 if ( $this->deletedSinceEdit !== null ) {
3585                         return $this->deletedSinceEdit;
3586                 }
3587
3588                 $this->deletedSinceEdit = false;
3589
3590                 if ( !$this->mTitle->exists() && $this->mTitle->isDeletedQuick() ) {
3591                         $this->lastDelete = $this->getLastDelete();
3592                         if ( $this->lastDelete ) {
3593                                 $deleteTime = wfTimestamp( TS_MW, $this->lastDelete->log_timestamp );
3594                                 if ( $deleteTime > $this->starttime ) {
3595                                         $this->deletedSinceEdit = true;
3596                                 }
3597                         }
3598                 }
3599
3600                 return $this->deletedSinceEdit;
3601         }
3602
3603         /**
3604          * @return bool|stdClass
3605          */
3606         protected function getLastDelete() {
3607                 $dbr = wfGetDB( DB_SLAVE );
3608                 $data = $dbr->selectRow(
3609                         [ 'logging', 'user' ],
3610                         [
3611                                 'log_type',
3612                                 'log_action',
3613                                 'log_timestamp',
3614                                 'log_user',
3615                                 'log_namespace',
3616                                 'log_title',
3617                                 'log_comment',
3618                                 'log_params',
3619                                 'log_deleted',
3620                                 'user_name'
3621                         ], [
3622                                 'log_namespace' => $this->mTitle->getNamespace(),
3623                                 'log_title' => $this->mTitle->getDBkey(),
3624                                 'log_type' => 'delete',
3625                                 'log_action' => 'delete',
3626                                 'user_id=log_user'
3627                         ],
3628                         __METHOD__,
3629                         [ 'LIMIT' => 1, 'ORDER BY' => 'log_timestamp DESC' ]
3630                 );
3631                 // Quick paranoid permission checks...
3632                 if ( is_object( $data ) ) {
3633                         if ( $data->log_deleted & LogPage::DELETED_USER ) {
3634                                 $data->user_name = wfMessage( 'rev-deleted-user' )->escaped();
3635                         }
3636
3637                         if ( $data->log_deleted & LogPage::DELETED_COMMENT ) {
3638                                 $data->log_comment = wfMessage( 'rev-deleted-comment' )->escaped();
3639                         }
3640                 }
3641
3642                 return $data;
3643         }
3644
3645         /**
3646          * Get the rendered text for previewing.
3647          * @throws MWException
3648          * @return string
3649          */
3650         function getPreviewText() {
3651                 global $wgOut, $wgUser, $wgRawHtml, $wgLang;
3652                 global $wgAllowUserCss, $wgAllowUserJs;
3653
3654                 $stats = $wgOut->getContext()->getStats();
3655
3656                 if ( $wgRawHtml && !$this->mTokenOk ) {
3657                         // Could be an offsite preview attempt. This is very unsafe if
3658                         // HTML is enabled, as it could be an attack.
3659                         $parsedNote = '';
3660                         if ( $this->textbox1 !== '' ) {
3661                                 // Do not put big scary notice, if previewing the empty
3662                                 // string, which happens when you initially edit
3663                                 // a category page, due to automatic preview-on-open.
3664                                 $parsedNote = $wgOut->parse( "<div class='previewnote'>" .
3665                                         wfMessage( 'session_fail_preview_html' )->text() . "</div>", true, /* interface */true );
3666                         }
3667                         $stats->increment( 'edit.failures.session_loss' );
3668                         return $parsedNote;
3669                 }
3670
3671                 $note = '';
3672
3673                 try {
3674                         $content = $this->toEditContent( $this->textbox1 );
3675
3676                         $previewHTML = '';
3677                         if ( !Hooks::run(
3678                                 'AlternateEditPreview',
3679                                 [ $this, &$content, &$previewHTML, &$this->mParserOutput ] )
3680                         ) {
3681                                 return $previewHTML;
3682                         }
3683
3684                         # provide a anchor link to the editform
3685                         $continueEditing = '<span class="mw-continue-editing">' .
3686                                 '[[#' . self::EDITFORM_ID . '|' . $wgLang->getArrow() . ' ' .
3687                                 wfMessage( 'continue-editing' )->text() . ']]</span>';
3688                         if ( $this->mTriedSave && !$this->mTokenOk ) {
3689                                 if ( $this->mTokenOkExceptSuffix ) {
3690                                         $note = wfMessage( 'token_suffix_mismatch' )->plain();
3691                                         $stats->increment( 'edit.failures.bad_token' );
3692                                 } else {
3693                                         $note = wfMessage( 'session_fail_preview' )->plain();
3694                                         $stats->increment( 'edit.failures.session_loss' );
3695                                 }
3696                         } elseif ( $this->incompleteForm ) {
3697                                 $note = wfMessage( 'edit_form_incomplete' )->plain();
3698                                 if ( $this->mTriedSave ) {
3699                                         $stats->increment( 'edit.failures.incomplete_form' );
3700                                 }
3701                         } else {
3702                                 $note = wfMessage( 'previewnote' )->plain() . ' ' . $continueEditing;
3703                         }
3704
3705                         $parserOptions = $this->page->makeParserOptions( $this->mArticle->getContext() );
3706                         $parserOptions->setIsPreview( true );
3707                         $parserOptions->setIsSectionPreview( !is_null( $this->section ) && $this->section !== '' );
3708
3709                         # don't parse non-wikitext pages, show message about preview
3710                         if ( $this->mTitle->isCssJsSubpage() || $this->mTitle->isCssOrJsPage() ) {
3711                                 if ( $this->mTitle->isCssJsSubpage() ) {
3712                                         $level = 'user';
3713                                 } elseif ( $this->mTitle->isCssOrJsPage() ) {
3714                                         $level = 'site';
3715                                 } else {
3716                                         $level = false;
3717                                 }
3718
3719                                 if ( $content->getModel() == CONTENT_MODEL_CSS ) {
3720                                         $format = 'css';
3721                                         if ( $level === 'user' && !$wgAllowUserCss ) {
3722                                                 $format = false;
3723                                         }
3724                                 } elseif ( $content->getModel() == CONTENT_MODEL_JAVASCRIPT ) {
3725                                         $format = 'js';
3726                                         if ( $level === 'user' && !$wgAllowUserJs ) {
3727                                                 $format = false;
3728                                         }
3729                                 } else {
3730                                         $format = false;
3731                                 }
3732
3733                                 # Used messages to make sure grep find them:
3734                                 # Messages: usercsspreview, userjspreview, sitecsspreview, sitejspreview
3735                                 if ( $level && $format ) {
3736                                         $note = "<div id='mw-{$level}{$format}preview'>" .
3737                                                 wfMessage( "{$level}{$format}preview" )->text() .
3738                                                 ' ' . $continueEditing . "</div>";
3739                                 }
3740                         }
3741
3742                         # If we're adding a comment, we need to show the
3743                         # summary as the headline
3744                         if ( $this->section === "new" && $this->summary !== "" ) {
3745                                 $content = $content->addSectionHeader( $this->summary );
3746                         }
3747
3748                         $hook_args = [ $this, &$content ];
3749                         ContentHandler::runLegacyHooks( 'EditPageGetPreviewText', $hook_args );
3750                         Hooks::run( 'EditPageGetPreviewContent', $hook_args );
3751
3752                         $parserOptions->enableLimitReport();
3753
3754                         # For CSS/JS pages, we should have called the ShowRawCssJs hook here.
3755                         # But it's now deprecated, so never mind
3756
3757                         $pstContent = $content->preSaveTransform( $this->mTitle, $wgUser, $parserOptions );
3758                         $scopedCallback = $parserOptions->setupFakeRevision(
3759                                 $this->mTitle, $pstContent, $wgUser );
3760                         $parserOutput = $pstContent->getParserOutput( $this->mTitle, null, $parserOptions );
3761
3762                         $parserOutput->setEditSectionTokens( false ); // no section edit links
3763                         $previewHTML = $parserOutput->getText();
3764                         $this->mParserOutput = $parserOutput;
3765                         $wgOut->addParserOutputMetadata( $parserOutput );
3766
3767                         if ( count( $parserOutput->getWarnings() ) ) {
3768                                 $note .= "\n\n" . implode( "\n\n", $parserOutput->getWarnings() );
3769                         }
3770
3771                         ScopedCallback::consume( $scopedCallback );
3772                 } catch ( MWContentSerializationException $ex ) {
3773                         $m = wfMessage(
3774                                 'content-failed-to-parse',
3775                                 $this->contentModel,
3776                                 $this->contentFormat,
3777                                 $ex->getMessage()
3778                         );
3779                         $note .= "\n\n" . $m->parse();
3780                         $previewHTML = '';
3781                 }
3782
3783                 if ( $this->isConflict ) {
3784                         $conflict = '<h2 id="mw-previewconflict">'
3785                                 . wfMessage( 'previewconflict' )->escaped() . "</h2>\n";
3786                 } else {
3787                         $conflict = '<hr />';
3788                 }
3789
3790                 $previewhead = "<div class='previewnote'>\n" .
3791                         '<h2 id="mw-previewheader">' . wfMessage( 'preview' )->escaped() . "</h2>" .
3792                         $wgOut->parse( $note, true, /* interface */true ) . $conflict . "</div>\n";
3793
3794                 $pageViewLang = $this->mTitle->getPageViewLanguage();
3795                 $attribs = [ 'lang' => $pageViewLang->getHtmlCode(), 'dir' => $pageViewLang->getDir(),
3796                         'class' => 'mw-content-' . $pageViewLang->getDir() ];
3797                 $previewHTML = Html::rawElement( 'div', $attribs, $previewHTML );
3798
3799                 return $previewhead . $previewHTML . $this->previewTextAfterContent;
3800         }
3801
3802         /**
3803          * @return array
3804          */
3805         function getTemplates() {
3806                 if ( $this->preview || $this->section != '' ) {
3807                         $templates = [];
3808                         if ( !isset( $this->mParserOutput ) ) {
3809                                 return $templates;
3810                         }
3811                         foreach ( $this->mParserOutput->getTemplates() as $ns => $template ) {
3812                                 foreach ( array_keys( $template ) as $dbk ) {
3813                                         $templates[] = Title::makeTitle( $ns, $dbk );
3814                                 }
3815                         }
3816                         return $templates;
3817                 } else {
3818                         return $this->mTitle->getTemplateLinksFrom();
3819                 }
3820         }
3821
3822         /**
3823          * Shows a bulletin board style toolbar for common editing functions.
3824          * It can be disabled in the user preferences.
3825          *
3826          * @param Title $title Title object for the page being edited (optional)
3827          * @return string
3828          */
3829         static function getEditToolbar( $title = null ) {
3830                 global $wgContLang, $wgOut;
3831                 global $wgEnableUploads, $wgForeignFileRepos;
3832
3833                 $imagesAvailable = $wgEnableUploads || count( $wgForeignFileRepos );
3834                 $showSignature = true;
3835                 if ( $title ) {
3836                         $showSignature = MWNamespace::wantSignatures( $title->getNamespace() );
3837                 }
3838
3839                 /**
3840                  * $toolarray is an array of arrays each of which includes the
3841                  * opening tag, the closing tag, optionally a sample text that is
3842                  * inserted between the two when no selection is highlighted
3843                  * and.  The tip text is shown when the user moves the mouse
3844                  * over the button.
3845                  *
3846                  * Images are defined in ResourceLoaderEditToolbarModule.
3847                  */
3848                 $toolarray = [
3849                         [
3850                                 'id'     => 'mw-editbutton-bold',
3851                                 'open'   => '\'\'\'',
3852                                 'close'  => '\'\'\'',
3853                                 'sample' => wfMessage( 'bold_sample' )->text(),
3854                                 'tip'    => wfMessage( 'bold_tip' )->text(),
3855                         ],
3856                         [
3857                                 'id'     => 'mw-editbutton-italic',
3858                                 'open'   => '\'\'',
3859                                 'close'  => '\'\'',
3860                                 'sample' => wfMessage( 'italic_sample' )->text(),
3861                                 'tip'    => wfMessage( 'italic_tip' )->text(),
3862                         ],
3863                         [
3864                                 'id'     => 'mw-editbutton-link',
3865                                 'open'   => '[[',
3866                                 'close'  => ']]',
3867                                 'sample' => wfMessage( 'link_sample' )->text(),
3868                                 'tip'    => wfMessage( 'link_tip' )->text(),
3869                         ],
3870                         [
3871                                 'id'     => 'mw-editbutton-extlink',
3872                                 'open'   => '[',
3873                                 'close'  => ']',
3874                                 'sample' => wfMessage( 'extlink_sample' )->text(),
3875                                 'tip'    => wfMessage( 'extlink_tip' )->text(),
3876                         ],
3877                         [
3878                                 'id'     => 'mw-editbutton-headline',
3879                                 'open'   => "\n== ",
3880                                 'close'  => " ==\n",
3881                                 'sample' => wfMessage( 'headline_sample' )->text(),
3882                                 'tip'    => wfMessage( 'headline_tip' )->text(),
3883                         ],
3884                         $imagesAvailable ? [
3885                                 'id'     => 'mw-editbutton-image',
3886                                 'open'   => '[[' . $wgContLang->getNsText( NS_FILE ) . ':',
3887                                 'close'  => ']]',
3888                                 'sample' => wfMessage( 'image_sample' )->text(),
3889                                 'tip'    => wfMessage( 'image_tip' )->text(),
3890                         ] : false,
3891                         $imagesAvailable ? [
3892                                 'id'     => 'mw-editbutton-media',
3893                                 'open'   => '[[' . $wgContLang->getNsText( NS_MEDIA ) . ':',
3894                                 'close'  => ']]',
3895                                 'sample' => wfMessage( 'media_sample' )->text(),
3896                                 'tip'    => wfMessage( 'media_tip' )->text(),
3897                         ] : false,
3898                         [
3899                                 'id'     => 'mw-editbutton-nowiki',
3900                                 'open'   => "<nowiki>",
3901                                 'close'  => "</nowiki>",
3902                                 'sample' => wfMessage( 'nowiki_sample' )->text(),
3903                                 'tip'    => wfMessage( 'nowiki_tip' )->text(),
3904                         ],
3905                         $showSignature ? [
3906                                 'id'     => 'mw-editbutton-signature',
3907                                 'open'   => wfMessage( 'sig-text', '~~~~' )->inContentLanguage()->text(),
3908                                 'close'  => '',
3909                                 'sample' => '',
3910                                 'tip'    => wfMessage( 'sig_tip' )->text(),
3911                         ] : false,
3912                         [
3913                                 'id'     => 'mw-editbutton-hr',
3914                                 'open'   => "\n----\n",
3915                                 'close'  => '',
3916                                 'sample' => '',
3917                                 'tip'    => wfMessage( 'hr_tip' )->text(),
3918                         ]
3919                 ];
3920
3921                 $script = 'mw.loader.using("mediawiki.toolbar", function () {';
3922                 foreach ( $toolarray as $tool ) {
3923                         if ( !$tool ) {
3924                                 continue;
3925                         }
3926
3927                         $params = [
3928                                 // Images are defined in ResourceLoaderEditToolbarModule
3929                                 false,
3930                                 // Note that we use the tip both for the ALT tag and the TITLE tag of the image.
3931                                 // Older browsers show a "speedtip" type message only for ALT.
3932                                 // Ideally these should be different, realistically they
3933                                 // probably don't need to be.
3934                                 $tool['tip'],
3935                                 $tool['open'],
3936                                 $tool['close'],
3937                                 $tool['sample'],
3938                                 $tool['id'],
3939                         ];
3940
3941                         $script .= Xml::encodeJsCall(
3942                                 'mw.toolbar.addButton',
3943                                 $params,
3944                                 ResourceLoader::inDebugMode()
3945                         );
3946                 }
3947
3948                 $script .= '});';
3949                 $wgOut->addScript( ResourceLoader::makeInlineScript( $script ) );
3950
3951                 $toolbar = '<div id="toolbar"></div>';
3952
3953                 Hooks::run( 'EditPageBeforeEditToolbar', [ &$toolbar ] );
3954
3955                 return $toolbar;
3956         }
3957
3958         /**
3959          * Returns an array of html code of the following checkboxes:
3960          * minor and watch
3961          *
3962          * @param int $tabindex Current tabindex
3963          * @param array $checked Array of checkbox => bool, where bool indicates the checked
3964          *                 status of the checkbox
3965          *
3966          * @return array
3967          */
3968         public function getCheckboxes( &$tabindex, $checked ) {
3969                 global $wgUser, $wgUseMediaWikiUIEverywhere;
3970
3971                 $checkboxes = [];
3972
3973                 // don't show the minor edit checkbox if it's a new page or section
3974                 if ( !$this->isNew ) {
3975                         $checkboxes['minor'] = '';
3976                         $minorLabel = wfMessage( 'minoredit' )->parse();
3977                         if ( $wgUser->isAllowed( 'minoredit' ) ) {
3978                                 $attribs = [
3979                                         'tabindex' => ++$tabindex,
3980                                         'accesskey' => wfMessage( 'accesskey-minoredit' )->text(),
3981                                         'id' => 'wpMinoredit',
3982                                 ];
3983                                 $minorEditHtml =
3984                                         Xml::check( 'wpMinoredit', $checked['minor'], $attribs ) .
3985                                         "&#160;<label for='wpMinoredit' id='mw-editpage-minoredit'" .
3986                                         Xml::expandAttributes( [ 'title' => Linker::titleAttrib( 'minoredit', 'withaccess' ) ] ) .
3987                                         ">{$minorLabel}</label>";
3988
3989                                 if ( $wgUseMediaWikiUIEverywhere ) {
3990                                         $checkboxes['minor'] = Html::openElement( 'div', [ 'class' => 'mw-ui-checkbox' ] ) .
3991                                                 $minorEditHtml .
3992                                         Html::closeElement( 'div' );
3993                                 } else {
3994                                         $checkboxes['minor'] = $minorEditHtml;
3995                                 }
3996                         }
3997                 }
3998
3999                 $watchLabel = wfMessage( 'watchthis' )->parse();
4000                 $checkboxes['watch'] = '';
4001                 if ( $wgUser->isLoggedIn() ) {
4002                         $attribs = [
4003                                 'tabindex' => ++$tabindex,
4004                                 'accesskey' => wfMessage( 'accesskey-watch' )->text(),
4005                                 'id' => 'wpWatchthis',
4006                         ];
4007                         $watchThisHtml =
4008                                 Xml::check( 'wpWatchthis', $checked['watch'], $attribs ) .
4009                                 "&#160;<label for='wpWatchthis' id='mw-editpage-watch'" .
4010                                 Xml::expandAttributes( [ 'title' => Linker::titleAttrib( 'watch', 'withaccess' ) ] ) .
4011                                 ">{$watchLabel}</label>";
4012                         if ( $wgUseMediaWikiUIEverywhere ) {
4013                                 $checkboxes['watch'] = Html::openElement( 'div', [ 'class' => 'mw-ui-checkbox' ] ) .
4014                                         $watchThisHtml .
4015                                         Html::closeElement( 'div' );
4016                         } else {
4017                                 $checkboxes['watch'] = $watchThisHtml;
4018                         }
4019                 }
4020                 Hooks::run( 'EditPageBeforeEditChecks', [ &$this, &$checkboxes, &$tabindex ] );
4021                 return $checkboxes;
4022         }
4023
4024         /**
4025          * Returns an array of html code of the following buttons:
4026          * save, diff, preview and live
4027          *
4028          * @param int $tabindex Current tabindex
4029          *
4030          * @return array
4031          */
4032         public function getEditButtons( &$tabindex ) {
4033                 $buttons = [];
4034
4035                 $buttonLabelKey = $this->isNew ? 'savearticle' : 'savechanges';
4036                 $buttonLabel = wfMessage( $buttonLabelKey )->text();
4037                 $attribs = [
4038                         'id' => 'wpSave',
4039                         'name' => 'wpSave',
4040                         'tabindex' => ++$tabindex,
4041                 ] + Linker::tooltipAndAccesskeyAttribs( 'save' );
4042                 $buttons['save'] = Html::submitButton( $buttonLabel, $attribs, [ 'mw-ui-constructive' ] );
4043
4044                 ++$tabindex; // use the same for preview and live preview
4045                 $attribs = [
4046                         'id' => 'wpPreview',
4047                         'name' => 'wpPreview',
4048                         'tabindex' => $tabindex,
4049                 ] + Linker::tooltipAndAccesskeyAttribs( 'preview' );
4050                 $buttons['preview'] = Html::submitButton( wfMessage( 'showpreview' )->text(),
4051                         $attribs );
4052                 $buttons['live'] = '';
4053
4054                 $attribs = [
4055                         'id' => 'wpDiff',
4056                         'name' => 'wpDiff',
4057                         'tabindex' => ++$tabindex,
4058                 ] + Linker::tooltipAndAccesskeyAttribs( 'diff' );
4059                 $buttons['diff'] = Html::submitButton( wfMessage( 'showdiff' )->text(),
4060                         $attribs );
4061
4062                 Hooks::run( 'EditPageBeforeEditButtons', [ &$this, &$buttons, &$tabindex ] );
4063                 return $buttons;
4064         }
4065
4066         /**
4067          * Creates a basic error page which informs the user that
4068          * they have attempted to edit a nonexistent section.
4069          */
4070         function noSuchSectionPage() {
4071                 global $wgOut;
4072
4073                 $wgOut->prepareErrorPage( wfMessage( 'nosuchsectiontitle' ) );
4074
4075                 $res = wfMessage( 'nosuchsectiontext', $this->section )->parseAsBlock();
4076                 Hooks::run( 'EditPageNoSuchSection', [ &$this, &$res ] );
4077                 $wgOut->addHTML( $res );
4078
4079                 $wgOut->returnToMain( false, $this->mTitle );
4080         }
4081
4082         /**
4083          * Show "your edit contains spam" page with your diff and text
4084          *
4085          * @param string|array|bool $match Text (or array of texts) which triggered one or more filters
4086          */
4087         public function spamPageWithContent( $match = false ) {
4088                 global $wgOut, $wgLang;
4089                 $this->textbox2 = $this->textbox1;
4090
4091                 if ( is_array( $match ) ) {
4092                         $match = $wgLang->listToText( $match );
4093                 }
4094                 $wgOut->prepareErrorPage( wfMessage( 'spamprotectiontitle' ) );
4095
4096                 $wgOut->addHTML( '<div id="spamprotected">' );
4097                 $wgOut->addWikiMsg( 'spamprotectiontext' );
4098                 if ( $match ) {
4099                         $wgOut->addWikiMsg( 'spamprotectionmatch', wfEscapeWikiText( $match ) );
4100                 }
4101                 $wgOut->addHTML( '</div>' );
4102
4103                 $wgOut->wrapWikiMsg( '<h2>$1</h2>', "yourdiff" );
4104                 $this->showDiff();
4105
4106                 $wgOut->wrapWikiMsg( '<h2>$1</h2>', "yourtext" );
4107                 $this->showTextbox2();
4108
4109                 $wgOut->addReturnTo( $this->getContextTitle(), [ 'action' => 'edit' ] );
4110         }
4111
4112         /**
4113          * Check if the browser is on a blacklist of user-agents known to
4114          * mangle UTF-8 data on form submission. Returns true if Unicode
4115          * should make it through, false if it's known to be a problem.
4116          * @return bool
4117          */
4118         private function checkUnicodeCompliantBrowser() {
4119                 global $wgBrowserBlackList, $wgRequest;
4120
4121                 $currentbrowser = $wgRequest->getHeader( 'User-Agent' );
4122                 if ( $currentbrowser === false ) {
4123                         // No User-Agent header sent? Trust it by default...
4124                         return true;
4125                 }
4126
4127                 foreach ( $wgBrowserBlackList as $browser ) {
4128                         if ( preg_match( $browser, $currentbrowser ) ) {
4129                                 return false;
4130                         }
4131                 }
4132                 return true;
4133         }
4134
4135         /**
4136          * Filter an input field through a Unicode de-armoring process if it
4137          * came from an old browser with known broken Unicode editing issues.
4138          *
4139          * @param WebRequest $request
4140          * @param string $field
4141          * @return string
4142          */
4143         protected function safeUnicodeInput( $request, $field ) {
4144                 $text = rtrim( $request->getText( $field ) );
4145                 return $request->getBool( 'safemode' )
4146                         ? $this->unmakeSafe( $text )
4147                         : $text;
4148         }
4149
4150         /**
4151          * Filter an output field through a Unicode armoring process if it is
4152          * going to an old browser with known broken Unicode editing issues.
4153          *
4154          * @param string $text
4155          * @return string
4156          */
4157         protected function safeUnicodeOutput( $text ) {
4158                 global $wgContLang;
4159                 $codedText = $wgContLang->recodeForEdit( $text );
4160                 return $this->checkUnicodeCompliantBrowser()
4161                         ? $codedText
4162                         : $this->makeSafe( $codedText );
4163         }
4164
4165         /**
4166          * A number of web browsers are known to corrupt non-ASCII characters
4167          * in a UTF-8 text editing environment. To protect against this,
4168          * detected browsers will be served an armored version of the text,
4169          * with non-ASCII chars converted to numeric HTML character references.
4170          *
4171          * Preexisting such character references will have a 0 added to them
4172          * to ensure that round-trips do not alter the original data.
4173          *
4174          * @param string $invalue
4175          * @return string
4176          */
4177         private function makeSafe( $invalue ) {
4178                 // Armor existing references for reversibility.
4179                 $invalue = strtr( $invalue, [ "&#x" => "&#x0" ] );
4180
4181                 $bytesleft = 0;
4182                 $result = "";
4183                 $working = 0;
4184                 $valueLength = strlen( $invalue );
4185                 for ( $i = 0; $i < $valueLength; $i++ ) {
4186                         $bytevalue = ord( $invalue[$i] );
4187                         if ( $bytevalue <= 0x7F ) { // 0xxx xxxx
4188                                 $result .= chr( $bytevalue );
4189                                 $bytesleft = 0;
4190                         } elseif ( $bytevalue <= 0xBF ) { // 10xx xxxx
4191                                 $working = $working << 6;
4192                                 $working += ( $bytevalue & 0x3F );
4193                                 $bytesleft--;
4194                                 if ( $bytesleft <= 0 ) {
4195                                         $result .= "&#x" . strtoupper( dechex( $working ) ) . ";";
4196                                 }
4197                         } elseif ( $bytevalue <= 0xDF ) { // 110x xxxx
4198                                 $working = $bytevalue & 0x1F;
4199                                 $bytesleft = 1;
4200                         } elseif ( $bytevalue <= 0xEF ) { // 1110 xxxx
4201                                 $working = $bytevalue & 0x0F;
4202                                 $bytesleft = 2;
4203                         } else { // 1111 0xxx
4204                                 $working = $bytevalue & 0x07;
4205                                 $bytesleft = 3;
4206                         }
4207                 }
4208                 return $result;
4209         }
4210
4211         /**
4212          * Reverse the previously applied transliteration of non-ASCII characters
4213          * back to UTF-8. Used to protect data from corruption by broken web browsers
4214          * as listed in $wgBrowserBlackList.
4215          *
4216          * @param string $invalue
4217          * @return string
4218          */
4219         private function unmakeSafe( $invalue ) {
4220                 $result = "";
4221                 $valueLength = strlen( $invalue );
4222                 for ( $i = 0; $i < $valueLength; $i++ ) {
4223                         if ( ( substr( $invalue, $i, 3 ) == "&#x" ) && ( $invalue[$i + 3] != '0' ) ) {
4224                                 $i += 3;
4225                                 $hexstring = "";
4226                                 do {
4227                                         $hexstring .= $invalue[$i];
4228                                         $i++;
4229                                 } while ( ctype_xdigit( $invalue[$i] ) && ( $i < strlen( $invalue ) ) );
4230
4231                                 // Do some sanity checks. These aren't needed for reversibility,
4232                                 // but should help keep the breakage down if the editor
4233                                 // breaks one of the entities whilst editing.
4234                                 if ( ( substr( $invalue, $i, 1 ) == ";" ) && ( strlen( $hexstring ) <= 6 ) ) {
4235                                         $codepoint = hexdec( $hexstring );
4236                                         $result .= UtfNormal\Utils::codepointToUtf8( $codepoint );
4237                                 } else {
4238                                         $result .= "&#x" . $hexstring . substr( $invalue, $i, 1 );
4239                                 }
4240                         } else {
4241                                 $result .= substr( $invalue, $i, 1 );
4242                         }
4243                 }
4244                 // reverse the transform that we made for reversibility reasons.
4245                 return strtr( $result, [ "&#x0" => "&#x" ] );
4246         }
4247 }