includes/EditPage.php

   1 <?php
   2 /**
   3  * User interface for page editing.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 use MediaWiki\Logger\LoggerFactory;
  24
  25 /**
  26  * The edit page/HTML interface (split from Article)
  27  * The actual database and text munging is still in Article,
  28  * but it should get easier to call those from alternate
  29  * interfaces.
  30  *
  31  * EditPage cares about two distinct titles:
  32  * $this->mContextTitle is the page that forms submit to, links point to,
  33  * redirects go to, etc. $this->mTitle (as well as $mArticle) is the
  34  * page in the database that is actually being edited. These are
  35  * usually the same, but they are now allowed to be different.
  36  *
  37  * Surgeon General's Warning: prolonged exposure to this class is known to cause
  38  * headaches, which may be fatal.
  39  */
  40 class EditPage {
  41         /**
  42          * Status: Article successfully updated
  43          */
  44         const AS_SUCCESS_UPDATE = 200;
  45
  46         /**
  47          * Status: Article successfully created
  48          */
  49         const AS_SUCCESS_NEW_ARTICLE = 201;
  50
  51         /**
  52          * Status: Article update aborted by a hook function
  53          */
  54         const AS_HOOK_ERROR = 210;
  55
  56         /**
  57          * Status: A hook function returned an error
  58          */
  59         const AS_HOOK_ERROR_EXPECTED = 212;
  60
  61         /**
  62          * Status: User is blocked from editing this page
  63          */
  64         const AS_BLOCKED_PAGE_FOR_USER = 215;
  65
  66         /**
  67          * Status: Content too big (> $wgMaxArticleSize)
  68          */
  69         const AS_CONTENT_TOO_BIG = 216;
  70
  71         /**
  72          * Status: this anonymous user is not allowed to edit this page
  73          */
  74         const AS_READ_ONLY_PAGE_ANON = 218;
  75
  76         /**
  77          * Status: this logged in user is not allowed to edit this page
  78          */
  79         const AS_READ_ONLY_PAGE_LOGGED = 219;
  80
  81         /**
  82          * Status: wiki is in readonly mode (wfReadOnly() == true)
  83          */
  84         const AS_READ_ONLY_PAGE = 220;
  85
  86         /**
  87          * Status: rate limiter for action 'edit' was tripped
  88          */
  89         const AS_RATE_LIMITED = 221;
  90
  91         /**
  92          * Status: article was deleted while editing and param wpRecreate == false or form
  93          * was not posted
  94          */
  95         const AS_ARTICLE_WAS_DELETED = 222;
  96
  97         /**
  98          * Status: user tried to create this page, but is not allowed to do that
  99          * ( Title->userCan('create') == false )
 100          */
 101         const AS_NO_CREATE_PERMISSION = 223;
 102
 103         /**
 104          * Status: user tried to create a blank page and wpIgnoreBlankArticle == false
 105          */
 106         const AS_BLANK_ARTICLE = 224;
 107
 108         /**
 109          * Status: (non-resolvable) edit conflict
 110          */
 111         const AS_CONFLICT_DETECTED = 225;
 112
 113         /**
 114          * Status: no edit summary given and the user has forceeditsummary set and the user is not
 115          * editing in his own userspace or talkspace and wpIgnoreBlankSummary == false
 116          */
 117         const AS_SUMMARY_NEEDED = 226;
 118
 119         /**
 120          * Status: user tried to create a new section without content
 121          */
 122         const AS_TEXTBOX_EMPTY = 228;
 123
 124         /**
 125          * Status: article is too big (> $wgMaxArticleSize), after merging in the new section
 126          */
 127         const AS_MAX_ARTICLE_SIZE_EXCEEDED = 229;
 128
 129         /**
 130          * Status: WikiPage::doEdit() was unsuccessful
 131          */
 132         const AS_END = 231;
 133
 134         /**
 135          * Status: summary contained spam according to one of the regexes in $wgSummarySpamRegex
 136          */
 137         const AS_SPAM_ERROR = 232;
 138
 139         /**
 140          * Status: anonymous user is not allowed to upload (User::isAllowed('upload') == false)
 141          */
 142         const AS_IMAGE_REDIRECT_ANON = 233;
 143
 144         /**
 145          * Status: logged in user is not allowed to upload (User::isAllowed('upload') == false)
 146          */
 147         const AS_IMAGE_REDIRECT_LOGGED = 234;
 148
 149         /**
 150          * Status: user tried to modify the content model, but is not allowed to do that
 151          * ( User::isAllowed('editcontentmodel') == false )
 152          */
 153         const AS_NO_CHANGE_CONTENT_MODEL = 235;
 154
 155         /**
 156          * Status: user tried to create self-redirect (redirect to the same article) and
 157          * wpIgnoreSelfRedirect == false
 158          */
 159         const AS_SELF_REDIRECT = 236;
 160
 161         /**
 162          * Status: an error relating to change tagging. Look at the message key for
 163          * more details
 164          */
 165         const AS_CHANGE_TAG_ERROR = 237;
 166
 167         /**
 168          * Status: can't parse content
 169          */
 170         const AS_PARSE_ERROR = 240;
 171
 172         /**
 173          * Status: when changing the content model is disallowed due to
 174          * $wgContentHandlerUseDB being false
 175          */
 176         const AS_CANNOT_USE_CUSTOM_MODEL = 241;
 177
 178         /**
 179          * HTML id and name for the beginning of the edit form.
 180          */
 181         const EDITFORM_ID = 'editform';
 182
 183         /**
 184          * Prefix of key for cookie used to pass post-edit state.
 185          * The revision id edited is added after this
 186          */
 187         const POST_EDIT_COOKIE_KEY_PREFIX = 'PostEditRevision';
 188
 189         /**
 190          * Duration of PostEdit cookie, in seconds.
 191          * The cookie will be removed instantly if the JavaScript runs.
 192          *
 193          * Otherwise, though, we don't want the cookies to accumulate.
 194          * RFC 2109 ( https://www.ietf.org/rfc/rfc2109.txt ) specifies a possible
 195          * limit of only 20 cookies per domain. This still applies at least to some
 196          * versions of IE without full updates:
 197          * https://blogs.msdn.com/b/ieinternals/archive/2009/08/20/wininet-ie-cookie-internals-faq.aspx
 198          *
 199          * A value of 20 minutes should be enough to take into account slow loads and minor
 200          * clock skew while still avoiding cookie accumulation when JavaScript is turned off.
 201          */
 202         const POST_EDIT_COOKIE_DURATION = 1200;
 203
 204         /** @var Article */
 205         public $mArticle;
 206         /** @var WikiPage */
 207         private $page;
 208
 209         /** @var Title */
 210         public $mTitle;
 211
 212         /** @var null|Title */
 213         private $mContextTitle = null;
 214
 215         /** @var string */
 216         public $action = 'submit';
 217
 218         /** @var bool */
 219         public $isConflict = false;
 220
 221         /** @var bool */
 222         public $isCssJsSubpage = false;
 223
 224         /** @var bool */
 225         public $isCssSubpage = false;
 226
 227         /** @var bool */
 228         public $isJsSubpage = false;
 229
 230         /** @var bool */
 231         public $isWrongCaseCssJsPage = false;
 232
 233         /** @var bool New page or new section */
 234         public $isNew = false;
 235
 236         /** @var bool */
 237         public $deletedSinceEdit;
 238
 239         /** @var string */
 240         public $formtype;
 241
 242         /** @var bool */
 243         public $firsttime;
 244
 245         /** @var bool|stdClass */
 246         public $lastDelete;
 247
 248         /** @var bool */
 249         public $mTokenOk = false;
 250
 251         /** @var bool */
 252         public $mTokenOkExceptSuffix = false;
 253
 254         /** @var bool */
 255         public $mTriedSave = false;
 256
 257         /** @var bool */
 258         public $incompleteForm = false;
 259
 260         /** @var bool */
 261         public $tooBig = false;
 262
 263         /** @var bool */
 264         public $missingComment = false;
 265
 266         /** @var bool */
 267         public $missingSummary = false;
 268
 269         /** @var bool */
 270         public $allowBlankSummary = false;
 271
 272         /** @var bool */
 273         protected $blankArticle = false;
 274
 275         /** @var bool */
 276         protected $allowBlankArticle = false;
 277
 278         /** @var bool */
 279         protected $selfRedirect = false;
 280
 281         /** @var bool */
 282         protected $allowSelfRedirect = false;
 283
 284         /** @var string */
 285         public $autoSumm = '';
 286
 287         /** @var string */
 288         public $hookError = '';
 289
 290         /** @var ParserOutput */
 291         public $mParserOutput;
 292
 293         /** @var bool Has a summary been preset using GET parameter &summary= ? */
 294         public $hasPresetSummary = false;
 295
 296         /** @var bool */
 297         public $mBaseRevision = false;
 298
 299         /** @var bool */
 300         public $mShowSummaryField = true;
 301
 302         # Form values
 303
 304         /** @var bool */
 305         public $save = false;
 306
 307         /** @var bool */
 308         public $preview = false;
 309
 310         /** @var bool */
 311         public $diff = false;
 312
 313         /** @var bool */
 314         public $minoredit = false;
 315
 316         /** @var bool */
 317         public $watchthis = false;
 318
 319         /** @var bool */
 320         public $recreate = false;
 321
 322         /** @var string */
 323         public $textbox1 = '';
 324
 325         /** @var string */
 326         public $textbox2 = '';
 327
 328         /** @var string */
 329         public $summary = '';
 330
 331         /** @var bool */
 332         public $nosummary = false;
 333
 334         /** @var string */
 335         public $edittime = '';
 336
 337         /** @var integer */
 338         private $editRevId = null;
 339
 340         /** @var string */
 341         public $section = '';
 342
 343         /** @var string */
 344         public $sectiontitle = '';
 345
 346         /** @var string */
 347         public $starttime = '';
 348
 349         /** @var int */
 350         public $oldid = 0;
 351
 352         /** @var int */
 353         public $parentRevId = 0;
 354
 355         /** @var string */
 356         public $editintro = '';
 357
 358         /** @var null */
 359         public $scrolltop = null;
 360
 361         /** @var bool */
 362         public $bot = true;
 363
 364         /** @var null|string */
 365         public $contentModel = null;
 366
 367         /** @var null|string */
 368         public $contentFormat = null;
 369
 370         /** @var null|array */
 371         private $changeTags = null;
 372
 373         # Placeholders for text injection by hooks (must be HTML)
 374         # extensions should take care to _append_ to the present value
 375
 376         /** @var string Before even the preview */
 377         public $editFormPageTop = '';
 378         public $editFormTextTop = '';
 379         public $editFormTextBeforeContent = '';
 380         public $editFormTextAfterWarn = '';
 381         public $editFormTextAfterTools = '';
 382         public $editFormTextBottom = '';
 383         public $editFormTextAfterContent = '';
 384         public $previewTextAfterContent = '';
 385         public $mPreloadContent = null;
 386
 387         /* $didSave should be set to true whenever an article was successfully altered. */
 388         public $didSave = false;
 389         public $undidRev = 0;
 390
 391         public $suppressIntro = false;
 392
 393         /** @var bool */
 394         protected $edit;
 395
 396         /** @var bool|int */
 397         protected $contentLength = false;
 398
 399         /**
 400          * @var bool Set in ApiEditPage, based on ContentHandler::allowsDirectApiEditing
 401          */
 402         private $enableApiEditOverride = false;
 403
 404         /**
 405          * @param Article $article
 406          */
 407         public function __construct( Article $article ) {
 408                 $this->mArticle = $article;
 409                 $this->page = $article->getPage(); // model object
 410                 $this->mTitle = $article->getTitle();
 411
 412                 $this->contentModel = $this->mTitle->getContentModel();
 413
 414                 $handler = ContentHandler::getForModelID( $this->contentModel );
 415                 $this->contentFormat = $handler->getDefaultFormat();
 416         }
 417
 418         /**
 419          * @return Article
 420          */
 421         public function getArticle() {
 422                 return $this->mArticle;
 423         }
 424
 425         /**
 426          * @since 1.19
 427          * @return Title
 428          */
 429         public function getTitle() {
 430                 return $this->mTitle;
 431         }
 432
 433         /**
 434          * Set the context Title object
 435          *
 436          * @param Title|null $title Title object or null
 437          */
 438         public function setContextTitle( $title ) {
 439                 $this->mContextTitle = $title;
 440         }
 441
 442         /**
 443          * Get the context title object.
 444          * If not set, $wgTitle will be returned. This behavior might change in
 445          * the future to return $this->mTitle instead.
 446          *
 447          * @return Title
 448          */
 449         public function getContextTitle() {
 450                 if ( is_null( $this->mContextTitle ) ) {
 451                         global $wgTitle;
 452                         return $wgTitle;
 453                 } else {
 454                         return $this->mContextTitle;
 455                 }
 456         }
 457
 458         /**
 459          * Returns if the given content model is editable.
 460          *
 461          * @param string $modelId The ID of the content model to test. Use CONTENT_MODEL_XXX constants.
 462          * @return bool
 463          * @throws MWException If $modelId has no known handler
 464          */
 465         public function isSupportedContentModel( $modelId ) {
 466                 return $this->enableApiEditOverride === true ||
 467                         ContentHandler::getForModelID( $modelId )->supportsDirectEditing();
 468         }
 469
 470         /**
 471          * Allow editing of content that supports API direct editing, but not general
 472          * direct editing. Set to false by default.
 473          *
 474          * @param bool $enableOverride
 475          */
 476         public function setApiEditOverride( $enableOverride ) {
 477                 $this->enableApiEditOverride = $enableOverride;
 478         }
 479
 480         function submit() {
 481                 $this->edit();
 482         }
 483
 484         /**
 485          * This is the function that gets called for "action=edit". It
 486          * sets up various member variables, then passes execution to
 487          * another function, usually showEditForm()
 488          *
 489          * The edit form is self-submitting, so that when things like
 490          * preview and edit conflicts occur, we get the same form back
 491          * with the extra stuff added.  Only when the final submission
 492          * is made and all is well do we actually save and redirect to
 493          * the newly-edited page.
 494          */
 495         function edit() {
 496                 global $wgOut, $wgRequest, $wgUser;
 497                 // Allow extensions to modify/prevent this form or submission
 498                 if ( !Hooks::run( 'AlternateEdit', [ $this ] ) ) {
 499                         return;
 500                 }
 501
 502                 wfDebug( __METHOD__ . ": enter\n" );
 503
 504                 // If they used redlink=1 and the page exists, redirect to the main article
 505                 if ( $wgRequest->getBool( 'redlink' ) && $this->mTitle->exists() ) {
 506                         $wgOut->redirect( $this->mTitle->getFullURL() );
 507                         return;
 508                 }
 509
 510                 $this->importFormData( $wgRequest );
 511                 $this->firsttime = false;
 512
 513                 if ( wfReadOnly() && $this->save ) {
 514                         // Force preview
 515                         $this->save = false;
 516                         $this->preview = true;
 517                 }
 518
 519                 if ( $this->save ) {
 520                         $this->formtype = 'save';
 521                 } elseif ( $this->preview ) {
 522                         $this->formtype = 'preview';
 523                 } elseif ( $this->diff ) {
 524                         $this->formtype = 'diff';
 525                 } else { # First time through
 526                         $this->firsttime = true;
 527                         if ( $this->previewOnOpen() ) {
 528                                 $this->formtype = 'preview';
 529                         } else {
 530                                 $this->formtype = 'initial';
 531                         }
 532                 }
 533
 534                 $permErrors = $this->getEditPermissionErrors( $this->save ? 'secure' : 'full' );
 535                 if ( $permErrors ) {
 536                         wfDebug( __METHOD__ . ": User can't edit\n" );
 537                         // Auto-block user's IP if the account was "hard" blocked
 538                         if ( !wfReadOnly() ) {
 539                                 $user = $wgUser;
 540                                 DeferredUpdates::addCallableUpdate( function () use ( $user ) {
 541                                         $user->spreadAnyEditBlock();
 542                                 } );
 543                         }
 544                         $this->displayPermissionsError( $permErrors );
 545
 546                         return;
 547                 }
 548
 549                 $revision = $this->mArticle->getRevisionFetched();
 550                 // Disallow editing revisions with content models different from the current one
 551                 if ( $revision && $revision->getContentModel() !== $this->contentModel ) {
 552                         $this->displayViewSourcePage(
 553                                 $this->getContentObject(),
 554                                 wfMessage(
 555                                         'contentmodelediterror',
 556                                         $revision->getContentModel(),
 557                                         $this->contentModel
 558                                 )->plain()
 559                         );
 560                         return;
 561                 }
 562
 563                 $this->isConflict = false;
 564                 // css / js subpages of user pages get a special treatment
 565                 $this->isCssJsSubpage = $this->mTitle->isCssJsSubpage();
 566                 $this->isCssSubpage = $this->mTitle->isCssSubpage();
 567                 $this->isJsSubpage = $this->mTitle->isJsSubpage();
 568                 // @todo FIXME: Silly assignment.
 569                 $this->isWrongCaseCssJsPage = $this->isWrongCaseCssJsPage();
 570
 571                 # Show applicable editing introductions
 572                 if ( $this->formtype == 'initial' || $this->firsttime ) {
 573                         $this->showIntro();
 574                 }
 575
 576                 # Attempt submission here.  This will check for edit conflicts,
 577                 # and redundantly check for locked database, blocked IPs, etc.
 578                 # that edit() already checked just in case someone tries to sneak
 579                 # in the back door with a hand-edited submission URL.
 580
 581                 if ( 'save' == $this->formtype ) {
 582                         $resultDetails = null;
 583                         $status = $this->attemptSave( $resultDetails );
 584                         if ( !$this->handleStatus( $status, $resultDetails ) ) {
 585                                 return;
 586                         }
 587                 }
 588
 589                 # First time through: get contents, set time for conflict
 590                 # checking, etc.
 591                 if ( 'initial' == $this->formtype || $this->firsttime ) {
 592                         if ( $this->initialiseForm() === false ) {
 593                                 $this->noSuchSectionPage();
 594                                 return;
 595                         }
 596
 597                         if ( !$this->mTitle->getArticleID() ) {
 598                                 Hooks::run( 'EditFormPreloadText', [ &$this->textbox1, &$this->mTitle ] );
 599                         } else {
 600                                 Hooks::run( 'EditFormInitialText', [ $this ] );
 601                         }
 602
 603                 }
 604
 605                 $this->showEditForm();
 606         }
 607
 608         /**
 609          * @param string $rigor Same format as Title::getUserPermissionErrors()
 610          * @return array
 611          */
 612         protected function getEditPermissionErrors( $rigor = 'secure' ) {
 613                 global $wgUser;
 614
 615                 $permErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser, $rigor );
 616                 # Can this title be created?
 617                 if ( !$this->mTitle->exists() ) {
 618                         $permErrors = array_merge(
 619                                 $permErrors,
 620                                 wfArrayDiff2(
 621                                         $this->mTitle->getUserPermissionsErrors( 'create', $wgUser, $rigor ),
 622                                         $permErrors
 623                                 )
 624                         );
 625                 }
 626                 # Ignore some permissions errors when a user is just previewing/viewing diffs
 627                 $remove = [];
 628                 foreach ( $permErrors as $error ) {
 629                         if ( ( $this->preview || $this->diff )
 630                                 && ( $error[0] == 'blockedtext' || $error[0] == 'autoblockedtext' )
 631                         ) {
 632                                 $remove[] = $error;
 633                         }
 634                 }
 635                 $permErrors = wfArrayDiff2( $permErrors, $remove );
 636
 637                 return $permErrors;
 638         }
 639
 640         /**
 641          * Display a permissions error page, like OutputPage::showPermissionsErrorPage(),
 642          * but with the following differences:
 643          * - If redlink=1, the user will be redirected to the page
 644          * - If there is content to display or the error occurs while either saving,
 645          *   previewing or showing the difference, it will be a
 646          *   "View source for ..." page displaying the source code after the error message.
 647          *
 648          * @since 1.19
 649          * @param array $permErrors Array of permissions errors, as returned by
 650          *    Title::getUserPermissionsErrors().
 651          * @throws PermissionsError
 652          */
 653         protected function displayPermissionsError( array $permErrors ) {
 654                 global $wgRequest, $wgOut;
 655
 656                 if ( $wgRequest->getBool( 'redlink' ) ) {
 657                         // The edit page was reached via a red link.
 658                         // Redirect to the article page and let them click the edit tab if
 659                         // they really want a permission error.
 660                         $wgOut->redirect( $this->mTitle->getFullURL() );
 661                         return;
 662                 }
 663
 664                 $content = $this->getContentObject();
 665
 666                 # Use the normal message if there's nothing to display
 667                 if ( $this->firsttime && ( !$content || $content->isEmpty() ) ) {
 668                         $action = $this->mTitle->exists() ? 'edit' :
 669                                 ( $this->mTitle->isTalkPage() ? 'createtalk' : 'createpage' );
 670                         throw new PermissionsError( $action, $permErrors );
 671                 }
 672
 673                 $this->displayViewSourcePage(
 674                         $content,
 675                         $wgOut->formatPermissionsErrorMessage( $permErrors, 'edit' )
 676                 );
 677         }
 678
 679         /**
 680          * Display a read-only View Source page
 681          * @param Content $content content object
 682          * @param string $errorMessage additional wikitext error message to display
 683          */
 684         protected function displayViewSourcePage( Content $content, $errorMessage = '' ) {
 685                 global $wgOut;
 686
 687                 Hooks::run( 'EditPage::showReadOnlyForm:initial', [ $this, &$wgOut ] );
 688
 689                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
 690                 $wgOut->setPageTitle( wfMessage(
 691                         'viewsource-title',
 692                         $this->getContextTitle()->getPrefixedText()
 693                 ) );
 694                 $wgOut->addBacklinkSubtitle( $this->getContextTitle() );
 695                 $wgOut->addHTML( $this->editFormPageTop );
 696                 $wgOut->addHTML( $this->editFormTextTop );
 697
 698                 if ( $errorMessage !== '' ) {
 699                         $wgOut->addWikiText( $errorMessage );
 700                         $wgOut->addHTML( "<hr />\n" );
 701                 }
 702
 703                 # If the user made changes, preserve them when showing the markup
 704                 # (This happens when a user is blocked during edit, for instance)
 705                 if ( !$this->firsttime ) {
 706                         $text = $this->textbox1;
 707                         $wgOut->addWikiMsg( 'viewyourtext' );
 708                 } else {
 709                         try {
 710                                 $text = $this->toEditText( $content );
 711                         } catch ( MWException $e ) {
 712                                 # Serialize using the default format if the content model is not supported
 713                                 # (e.g. for an old revision with a different model)
 714                                 $text = $content->serialize();
 715                         }
 716                         $wgOut->addWikiMsg( 'viewsourcetext' );
 717                 }
 718
 719                 $wgOut->addHTML( $this->editFormTextBeforeContent );
 720                 $this->showTextbox( $text, 'wpTextbox1', [ 'readonly' ] );
 721                 $wgOut->addHTML( $this->editFormTextAfterContent );
 722
 723                 $wgOut->addHTML( Html::rawElement( 'div', [ 'class' => 'templatesUsed' ],
 724                         Linker::formatTemplates( $this->getTemplates() ) ) );
 725
 726                 $wgOut->addModules( 'mediawiki.action.edit.collapsibleFooter' );
 727
 728                 $wgOut->addHTML( $this->editFormTextBottom );
 729                 if ( $this->mTitle->exists() ) {
 730                         $wgOut->returnToMain( null, $this->mTitle );
 731                 }
 732         }
 733
 734         /**
 735          * Should we show a preview when the edit form is first shown?
 736          *
 737          * @return bool
 738          */
 739         protected function previewOnOpen() {
 740                 global $wgRequest, $wgUser, $wgPreviewOnOpenNamespaces;
 741                 if ( $wgRequest->getVal( 'preview' ) == 'yes' ) {
 742                         // Explicit override from request
 743                         return true;
 744                 } elseif ( $wgRequest->getVal( 'preview' ) == 'no' ) {
 745                         // Explicit override from request
 746                         return false;
 747                 } elseif ( $this->section == 'new' ) {
 748                         // Nothing *to* preview for new sections
 749                         return false;
 750                 } elseif ( ( $wgRequest->getVal( 'preload' ) !== null || $this->mTitle->exists() )
 751                         && $wgUser->getOption( 'previewonfirst' )
 752                 ) {
 753                         // Standard preference behavior
 754                         return true;
 755                 } elseif ( !$this->mTitle->exists()
 756                         && isset( $wgPreviewOnOpenNamespaces[$this->mTitle->getNamespace()] )
 757                         && $wgPreviewOnOpenNamespaces[$this->mTitle->getNamespace()]
 758                 ) {
 759                         // Categories are special
 760                         return true;
 761                 } else {
 762                         return false;
 763                 }
 764         }
 765
 766         /**
 767          * Checks whether the user entered a skin name in uppercase,
 768          * e.g. "User:Example/Monobook.css" instead of "monobook.css"
 769          *
 770          * @return bool
 771          */
 772         protected function isWrongCaseCssJsPage() {
 773                 if ( $this->mTitle->isCssJsSubpage() ) {
 774                         $name = $this->mTitle->getSkinFromCssJsSubpage();
 775                         $skins = array_merge(
 776                                 array_keys( Skin::getSkinNames() ),
 777                                 [ 'common' ]
 778                         );
 779                         return !in_array( $name, $skins )
 780                                 && in_array( strtolower( $name ), $skins );
 781                 } else {
 782                         return false;
 783                 }
 784         }
 785
 786         /**
 787          * Returns whether section editing is supported for the current page.
 788          * Subclasses may override this to replace the default behavior, which is
 789          * to check ContentHandler::supportsSections.
 790          *
 791          * @return bool True if this edit page supports sections, false otherwise.
 792          */
 793         protected function isSectionEditSupported() {
 794                 $contentHandler = ContentHandler::getForTitle( $this->mTitle );
 795                 return $contentHandler->supportsSections();
 796         }
 797
 798         /**
 799          * This function collects the form data and uses it to populate various member variables.
 800          * @param WebRequest $request
 801          * @throws ErrorPageError
 802          */
 803         function importFormData( &$request ) {
 804                 global $wgContLang, $wgUser;
 805
 806                 # Section edit can come from either the form or a link
 807                 $this->section = $request->getVal( 'wpSection', $request->getVal( 'section' ) );
 808
 809                 if ( $this->section !== null && $this->section !== '' && !$this->isSectionEditSupported() ) {
 810                         throw new ErrorPageError( 'sectioneditnotsupported-title', 'sectioneditnotsupported-text' );
 811                 }
 812
 813                 $this->isNew = !$this->mTitle->exists() || $this->section == 'new';
 814
 815                 if ( $request->wasPosted() ) {
 816                         # These fields need to be checked for encoding.
 817                         # Also remove trailing whitespace, but don't remove _initial_
 818                         # whitespace from the text boxes. This may be significant formatting.
 819                         $this->textbox1 = $this->safeUnicodeInput( $request, 'wpTextbox1' );
 820                         if ( !$request->getCheck( 'wpTextbox2' ) ) {
 821                                 // Skip this if wpTextbox2 has input, it indicates that we came
 822                                 // from a conflict page with raw page text, not a custom form
 823                                 // modified by subclasses
 824                                 $textbox1 = $this->importContentFormData( $request );
 825                                 if ( $textbox1 !== null ) {
 826                                         $this->textbox1 = $textbox1;
 827                                 }
 828                         }
 829
 830                         # Truncate for whole multibyte characters
 831                         $this->summary = $wgContLang->truncate( $request->getText( 'wpSummary' ), 255 );
 832
 833                         # If the summary consists of a heading, e.g. '==Foobar==', extract the title from the
 834                         # header syntax, e.g. 'Foobar'. This is mainly an issue when we are using wpSummary for
 835                         # section titles.
 836                         $this->summary = preg_replace( '/^\s*=+\s*(.*?)\s*=+\s*$/', '$1', $this->summary );
 837
 838                         # Treat sectiontitle the same way as summary.
 839                         # Note that wpSectionTitle is not yet a part of the actual edit form, as wpSummary is
 840                         # currently doing double duty as both edit summary and section title. Right now this
 841                         # is just to allow API edits to work around this limitation, but this should be
 842                         # incorporated into the actual edit form when EditPage is rewritten (Bugs 18654, 26312).
 843                         $this->sectiontitle = $wgContLang->truncate( $request->getText( 'wpSectionTitle' ), 255 );
 844                         $this->sectiontitle = preg_replace( '/^\s*=+\s*(.*?)\s*=+\s*$/', '$1', $this->sectiontitle );
 845
 846                         $this->edittime = $request->getVal( 'wpEdittime' );
 847                         $this->editRevId = $request->getIntOrNull( 'editRevId' );
 848                         $this->starttime = $request->getVal( 'wpStarttime' );
 849
 850                         $undidRev = $request->getInt( 'wpUndidRevision' );
 851                         if ( $undidRev ) {
 852                                 $this->undidRev = $undidRev;
 853                         }
 854
 855                         $this->scrolltop = $request->getIntOrNull( 'wpScrolltop' );
 856
 857                         if ( $this->textbox1 === '' && $request->getVal( 'wpTextbox1' ) === null ) {
 858                                 // wpTextbox1 field is missing, possibly due to being "too big"
 859                                 // according to some filter rules such as Suhosin's setting for
 860                                 // suhosin.request.max_value_length (d'oh)
 861                                 $this->incompleteForm = true;
 862                         } else {
 863                                 // If we receive the last parameter of the request, we can fairly
 864                                 // claim the POST request has not been truncated.
 865
 866                                 // TODO: softened the check for cutover.  Once we determine
 867                                 // that it is safe, we should complete the transition by
 868                                 // removing the "edittime" clause.
 869                                 $this->incompleteForm = ( !$request->getVal( 'wpUltimateParam' )
 870                                         && is_null( $this->edittime ) );
 871                         }
 872                         if ( $this->incompleteForm ) {
 873                                 # If the form is incomplete, force to preview.
 874                                 wfDebug( __METHOD__ . ": Form data appears to be incomplete\n" );
 875                                 wfDebug( "POST DATA: " . var_export( $_POST, true ) . "\n" );
 876                                 $this->preview = true;
 877                         } else {
 878                                 $this->preview = $request->getCheck( 'wpPreview' );
 879                                 $this->diff = $request->getCheck( 'wpDiff' );
 880
 881                                 // Remember whether a save was requested, so we can indicate
 882                                 // if we forced preview due to session failure.
 883                                 $this->mTriedSave = !$this->preview;
 884
 885                                 if ( $this->tokenOk( $request ) ) {
 886                                         # Some browsers will not report any submit button
 887                                         # if the user hits enter in the comment box.
 888                                         # The unmarked state will be assumed to be a save,
 889                                         # if the form seems otherwise complete.
 890                                         wfDebug( __METHOD__ . ": Passed token check.\n" );
 891                                 } elseif ( $this->diff ) {
 892                                         # Failed token check, but only requested "Show Changes".
 893                                         wfDebug( __METHOD__ . ": Failed token check; Show Changes requested.\n" );
 894                                 } else {
 895                                         # Page might be a hack attempt posted from
 896                                         # an external site. Preview instead of saving.
 897                                         wfDebug( __METHOD__ . ": Failed token check; forcing preview\n" );
 898                                         $this->preview = true;
 899                                 }
 900                         }
 901                         $this->save = !$this->preview && !$this->diff;
 902                         if ( !preg_match( '/^\d{14}$/', $this->edittime ) ) {
 903                                 $this->edittime = null;
 904                         }
 905
 906                         if ( !preg_match( '/^\d{14}$/', $this->starttime ) ) {
 907                                 $this->starttime = null;
 908                         }
 909
 910                         $this->recreate = $request->getCheck( 'wpRecreate' );
 911
 912                         $this->minoredit = $request->getCheck( 'wpMinoredit' );
 913                         $this->watchthis = $request->getCheck( 'wpWatchthis' );
 914
 915                         # Don't force edit summaries when a user is editing their own user or talk page
 916                         if ( ( $this->mTitle->mNamespace == NS_USER || $this->mTitle->mNamespace == NS_USER_TALK )
 917                                 && $this->mTitle->getText() == $wgUser->getName()
 918                         ) {
 919                                 $this->allowBlankSummary = true;
 920                         } else {
 921                                 $this->allowBlankSummary = $request->getBool( 'wpIgnoreBlankSummary' )
 922                                         || !$wgUser->getOption( 'forceeditsummary' );
 923                         }
 924
 925                         $this->autoSumm = $request->getText( 'wpAutoSummary' );
 926
 927                         $this->allowBlankArticle = $request->getBool( 'wpIgnoreBlankArticle' );
 928                         $this->allowSelfRedirect = $request->getBool( 'wpIgnoreSelfRedirect' );
 929
 930                         $changeTags = $request->getVal( 'wpChangeTags' );
 931                         if ( is_null( $changeTags ) || $changeTags === '' ) {
 932                                 $this->changeTags = [];
 933                         } else {
 934                                 $this->changeTags = array_filter( array_map( 'trim', explode( ',',
 935                                         $changeTags ) ) );
 936                         }
 937                 } else {
 938                         # Not a posted form? Start with nothing.
 939                         wfDebug( __METHOD__ . ": Not a posted form.\n" );
 940                         $this->textbox1 = '';
 941                         $this->summary = '';
 942                         $this->sectiontitle = '';
 943                         $this->edittime = '';
 944                         $this->editRevId = null;
 945                         $this->starttime = wfTimestampNow();
 946                         $this->edit = false;
 947                         $this->preview = false;
 948                         $this->save = false;
 949                         $this->diff = false;
 950                         $this->minoredit = false;
 951                         // Watch may be overridden by request parameters
 952                         $this->watchthis = $request->getBool( 'watchthis', false );
 953                         $this->recreate = false;
 954
 955                         // When creating a new section, we can preload a section title by passing it as the
 956                         // preloadtitle parameter in the URL (Bug 13100)
 957                         if ( $this->section == 'new' && $request->getVal( 'preloadtitle' ) ) {
 958                                 $this->sectiontitle = $request->getVal( 'preloadtitle' );
 959                                 // Once wpSummary isn't being use for setting section titles, we should delete this.
 960                                 $this->summary = $request->getVal( 'preloadtitle' );
 961                         } elseif ( $this->section != 'new' && $request->getVal( 'summary' ) ) {
 962                                 $this->summary = $request->getText( 'summary' );
 963                                 if ( $this->summary !== '' ) {
 964                                         $this->hasPresetSummary = true;
 965                                 }
 966                         }
 967
 968                         if ( $request->getVal( 'minor' ) ) {
 969                                 $this->minoredit = true;
 970                         }
 971                 }
 972
 973                 $this->oldid = $request->getInt( 'oldid' );
 974                 $this->parentRevId = $request->getInt( 'parentRevId' );
 975
 976                 $this->bot = $request->getBool( 'bot', true );
 977                 $this->nosummary = $request->getBool( 'nosummary' );
 978
 979                 // May be overridden by revision.
 980                 $this->contentModel = $request->getText( 'model', $this->contentModel );
 981                 // May be overridden by revision.
 982                 $this->contentFormat = $request->getText( 'format', $this->contentFormat );
 983
 984                 if ( !ContentHandler::getForModelID( $this->contentModel )
 985                         ->isSupportedFormat( $this->contentFormat )
 986                 ) {
 987                         throw new ErrorPageError(
 988                                 'editpage-notsupportedcontentformat-title',
 989                                 'editpage-notsupportedcontentformat-text',
 990                                 [ $this->contentFormat, ContentHandler::getLocalizedName( $this->contentModel ) ]
 991                         );
 992                 }
 993
 994                 /**
 995                  * @todo Check if the desired model is allowed in this namespace, and if
 996                  *   a transition from the page's current model to the new model is
 997                  *   allowed.
 998                  */
 999
1000                 $this->editintro = $request->getText( 'editintro',
1001                         // Custom edit intro for new sections
1002                         $this->section === 'new' ? 'MediaWiki:addsection-editintro' : '' );
1003
1004                 // Allow extensions to modify form data
1005                 Hooks::run( 'EditPage::importFormData', [ $this, $request ] );
1006
1007         }
1008
1009         /**
1010          * Subpage overridable method for extracting the page content data from the
1011          * posted form to be placed in $this->textbox1, if using customized input
1012          * this method should be overridden and return the page text that will be used
1013          * for saving, preview parsing and so on...
1014          *
1015          * @param WebRequest $request
1016          * @return string|null
1017          */
1018         protected function importContentFormData( &$request ) {
1019                 return; // Don't do anything, EditPage already extracted wpTextbox1
1020         }
1021
1022         /**
1023          * Initialise form fields in the object
1024          * Called on the first invocation, e.g. when a user clicks an edit link
1025          * @return bool If the requested section is valid
1026          */
1027         function initialiseForm() {
1028                 global $wgUser;
1029                 $this->edittime = $this->page->getTimestamp();
1030                 $this->editRevId = $this->page->getLatest();
1031
1032                 $content = $this->getContentObject( false ); # TODO: track content object?!
1033                 if ( $content === false ) {
1034                         return false;
1035                 }
1036                 $this->textbox1 = $this->toEditText( $content );
1037
1038                 // activate checkboxes if user wants them to be always active
1039                 # Sort out the "watch" checkbox
1040                 if ( $wgUser->getOption( 'watchdefault' ) ) {
1041                         # Watch all edits
1042                         $this->watchthis = true;
1043                 } elseif ( $wgUser->getOption( 'watchcreations' ) && !$this->mTitle->exists() ) {
1044                         # Watch creations
1045                         $this->watchthis = true;
1046                 } elseif ( $wgUser->isWatched( $this->mTitle ) ) {
1047                         # Already watched
1048                         $this->watchthis = true;
1049                 }
1050                 if ( $wgUser->getOption( 'minordefault' ) && !$this->isNew ) {
1051                         $this->minoredit = true;
1052                 }
1053                 if ( $this->textbox1 === false ) {
1054                         return false;
1055                 }
1056                 return true;
1057         }
1058
1059         /**
1060          * @param Content|null $def_content The default value to return
1061          *
1062          * @return Content|null Content on success, $def_content for invalid sections
1063          *
1064          * @since 1.21
1065          */
1066         protected function getContentObject( $def_content = null ) {
1067                 global $wgOut, $wgRequest, $wgUser, $wgContLang;
1068
1069                 $content = false;
1070
1071                 // For message page not locally set, use the i18n message.
1072                 // For other non-existent articles, use preload text if any.
1073                 if ( !$this->mTitle->exists() || $this->section == 'new' ) {
1074                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI && $this->section != 'new' ) {
1075                                 # If this is a system message, get the default text.
1076                                 $msg = $this->mTitle->getDefaultMessageText();
1077
1078                                 $content = $this->toEditContent( $msg );
1079                         }
1080                         if ( $content === false ) {
1081                                 # If requested, preload some text.
1082                                 $preload = $wgRequest->getVal( 'preload',
1083                                         // Custom preload text for new sections
1084                                         $this->section === 'new' ? 'MediaWiki:addsection-preload' : '' );
1085                                 $params = $wgRequest->getArray( 'preloadparams', [] );
1086
1087                                 $content = $this->getPreloadedContent( $preload, $params );
1088                         }
1089                 // For existing pages, get text based on "undo" or section parameters.
1090                 } else {
1091                         if ( $this->section != '' ) {
1092                                 // Get section edit text (returns $def_text for invalid sections)
1093                                 $orig = $this->getOriginalContent( $wgUser );
1094                                 $content = $orig ? $orig->getSection( $this->section ) : null;
1095
1096                                 if ( !$content ) {
1097                                         $content = $def_content;
1098                                 }
1099                         } else {
1100                                 $undoafter = $wgRequest->getInt( 'undoafter' );
1101                                 $undo = $wgRequest->getInt( 'undo' );
1102
1103                                 if ( $undo > 0 && $undoafter > 0 ) {
1104                                         $undorev = Revision::newFromId( $undo );
1105                                         $oldrev = Revision::newFromId( $undoafter );
1106
1107                                         # Sanity check, make sure it's the right page,
1108                                         # the revisions exist and they were not deleted.
1109                                         # Otherwise, $content will be left as-is.
1110                                         if ( !is_null( $undorev ) && !is_null( $oldrev ) &&
1111                                                 !$undorev->isDeleted( Revision::DELETED_TEXT ) &&
1112                                                 !$oldrev->isDeleted( Revision::DELETED_TEXT )
1113                                         ) {
1114                                                 $content = $this->page->getUndoContent( $undorev, $oldrev );
1115
1116                                                 if ( $content === false ) {
1117                                                         # Warn the user that something went wrong
1118                                                         $undoMsg = 'failure';
1119                                                 } else {
1120                                                         $oldContent = $this->page->getContent( Revision::RAW );
1121                                                         $popts = ParserOptions::newFromUserAndLang( $wgUser, $wgContLang );
1122                                                         $newContent = $content->preSaveTransform( $this->mTitle, $wgUser, $popts );
1123
1124                                                         if ( $newContent->equals( $oldContent ) ) {
1125                                                                 # Tell the user that the undo results in no change,
1126                                                                 # i.e. the revisions were already undone.
1127                                                                 $undoMsg = 'nochange';
1128                                                                 $content = false;
1129                                                         } else {
1130                                                                 # Inform the user of our success and set an automatic edit summary
1131                                                                 $undoMsg = 'success';
1132
1133                                                                 # If we just undid one rev, use an autosummary
1134                                                                 $firstrev = $oldrev->getNext();
1135                                                                 if ( $firstrev && $firstrev->getId() == $undo ) {
1136                                                                         $userText = $undorev->getUserText();
1137                                                                         if ( $userText === '' ) {
1138                                                                                 $undoSummary = wfMessage(
1139                                                                                         'undo-summary-username-hidden',
1140                                                                                         $undo
1141                                                                                 )->inContentLanguage()->text();
1142                                                                         } else {
1143                                                                                 $undoSummary = wfMessage(
1144                                                                                         'undo-summary',
1145                                                                                         $undo,
1146                                                                                         $userText
1147                                                                                 )->inContentLanguage()->text();
1148                                                                         }
1149                                                                         if ( $this->summary === '' ) {
1150                                                                                 $this->summary = $undoSummary;
1151                                                                         } else {
1152                                                                                 $this->summary = $undoSummary . wfMessage( 'colon-separator' )
1153                                                                                         ->inContentLanguage()->text() . $this->summary;
1154                                                                         }
1155                                                                         $this->undidRev = $undo;
1156                                                                 }
1157                                                                 $this->formtype = 'diff';
1158                                                         }
1159                                                 }
1160                                         } else {
1161                                                 // Failed basic sanity checks.
1162                                                 // Older revisions may have been removed since the link
1163                                                 // was created, or we may simply have got bogus input.
1164                                                 $undoMsg = 'norev';
1165                                         }
1166
1167                                         // Messages: undo-success, undo-failure, undo-norev, undo-nochange
1168                                         $class = ( $undoMsg == 'success' ? '' : 'error ' ) . "mw-undo-{$undoMsg}";
1169                                         $this->editFormPageTop .= $wgOut->parse( "<div class=\"{$class}\">" .
1170                                                 wfMessage( 'undo-' . $undoMsg )->plain() . '</div>', true, /* interface */true );
1171                                 }
1172
1173                                 if ( $content === false ) {
1174                                         $content = $this->getOriginalContent( $wgUser );
1175                                 }
1176                         }
1177                 }
1178
1179                 return $content;
1180         }
1181
1182         /**
1183          * Get the content of the wanted revision, without section extraction.
1184          *
1185          * The result of this function can be used to compare user's input with
1186          * section replaced in its context (using WikiPage::replaceSectionAtRev())
1187          * to the original text of the edit.
1188          *
1189          * This differs from Article::getContent() that when a missing revision is
1190          * encountered the result will be null and not the
1191          * 'missing-revision' message.
1192          *
1193          * @since 1.19
1194          * @param User $user The user to get the revision for
1195          * @return Content|null
1196          */
1197         private function getOriginalContent( User $user ) {
1198                 if ( $this->section == 'new' ) {
1199                         return $this->getCurrentContent();
1200                 }
1201                 $revision = $this->mArticle->getRevisionFetched();
1202                 if ( $revision === null ) {
1203                         if ( !$this->contentModel ) {
1204                                 $this->contentModel = $this->getTitle()->getContentModel();
1205                         }
1206                         $handler = ContentHandler::getForModelID( $this->contentModel );
1207
1208                         return $handler->makeEmptyContent();
1209                 }
1210                 $content = $revision->getContent( Revision::FOR_THIS_USER, $user );
1211                 return $content;
1212         }
1213
1214         /**
1215          * Get the edit's parent revision ID
1216          *
1217          * The "parent" revision is the ancestor that should be recorded in this
1218          * page's revision history.  It is either the revision ID of the in-memory
1219          * article content, or in the case of a 3-way merge in order to rebase
1220          * across a recoverable edit conflict, the ID of the newer revision to
1221          * which we have rebased this page.
1222          *
1223          * @since 1.27
1224          * @return int Revision ID
1225          */
1226         public function getParentRevId() {
1227                 if ( $this->parentRevId ) {
1228                         return $this->parentRevId;
1229                 } else {
1230                         return $this->mArticle->getRevIdFetched();
1231                 }
1232         }
1233
1234         /**
1235          * Get the current content of the page. This is basically similar to
1236          * WikiPage::getContent( Revision::RAW ) except that when the page doesn't exist an empty
1237          * content object is returned instead of null.
1238          *
1239          * @since 1.21
1240          * @return Content
1241          */
1242         protected function getCurrentContent() {
1243                 $rev = $this->page->getRevision();
1244                 $content = $rev ? $rev->getContent( Revision::RAW ) : null;
1245
1246                 if ( $content === false || $content === null ) {
1247                         if ( !$this->contentModel ) {
1248                                 $this->contentModel = $this->getTitle()->getContentModel();
1249                         }
1250                         $handler = ContentHandler::getForModelID( $this->contentModel );
1251
1252                         return $handler->makeEmptyContent();
1253                 } else {
1254                         // Content models should always be the same since we error
1255                         // out if they are different before this point.
1256                         $logger = LoggerFactory::getInstance( 'editpage' );
1257                         if ( $this->contentModel !== $rev->getContentModel() ) {
1258                                 $logger->warning( "Overriding content model from current edit {prev} to {new}", [
1259                                         'prev' => $this->contentModel,
1260                                         'new' => $rev->getContentModel(),
1261                                         'title' => $this->getTitle()->getPrefixedDBkey(),
1262                                         'method' => __METHOD__
1263                                 ] );
1264                                 $this->contentModel = $rev->getContentModel();
1265                         }
1266
1267                         // Given that the content models should match, the current selected
1268                         // format should be supported.
1269                         if ( !$content->isSupportedFormat( $this->contentFormat ) ) {
1270                                 $logger->warning( "Current revision content format unsupported. Overriding {prev} to {new}", [
1271
1272                                         'prev' => $this->contentFormat,
1273                                         'new' => $rev->getContentFormat(),
1274                                         'title' => $this->getTitle()->getPrefixedDBkey(),
1275                                         'method' => __METHOD__
1276                                 ] );
1277                                 $this->contentFormat = $rev->getContentFormat();
1278                         }
1279
1280                         return $content;
1281                 }
1282         }
1283
1284         /**
1285          * Use this method before edit() to preload some content into the edit box
1286          *
1287          * @param Content $content
1288          *
1289          * @since 1.21
1290          */
1291         public function setPreloadedContent( Content $content ) {
1292                 $this->mPreloadContent = $content;
1293         }
1294
1295         /**
1296          * Get the contents to be preloaded into the box, either set by
1297          * an earlier setPreloadText() or by loading the given page.
1298          *
1299          * @param string $preload Representing the title to preload from.
1300          * @param array $params Parameters to use (interface-message style) in the preloaded text
1301          *
1302          * @return Content
1303          *
1304          * @since 1.21
1305          */
1306         protected function getPreloadedContent( $preload, $params = [] ) {
1307                 global $wgUser;
1308
1309                 if ( !empty( $this->mPreloadContent ) ) {
1310                         return $this->mPreloadContent;
1311                 }
1312
1313                 $handler = ContentHandler::getForModelID( $this->contentModel );
1314
1315                 if ( $preload === '' ) {
1316                         return $handler->makeEmptyContent();
1317                 }
1318
1319                 $title = Title::newFromText( $preload );
1320                 # Check for existence to avoid getting MediaWiki:Noarticletext
1321                 if ( $title === null || !$title->exists() || !$title->userCan( 'read', $wgUser ) ) {
1322                         // TODO: somehow show a warning to the user!
1323                         return $handler->makeEmptyContent();
1324                 }
1325
1326                 $page = WikiPage::factory( $title );
1327                 if ( $page->isRedirect() ) {
1328                         $title = $page->getRedirectTarget();
1329                         # Same as before
1330                         if ( $title === null || !$title->exists() || !$title->userCan( 'read', $wgUser ) ) {
1331                                 // TODO: somehow show a warning to the user!
1332                                 return $handler->makeEmptyContent();
1333                         }
1334                         $page = WikiPage::factory( $title );
1335                 }
1336
1337                 $parserOptions = ParserOptions::newFromUser( $wgUser );
1338                 $content = $page->getContent( Revision::RAW );
1339
1340                 if ( !$content ) {
1341                         // TODO: somehow show a warning to the user!
1342                         return $handler->makeEmptyContent();
1343                 }
1344
1345                 if ( $content->getModel() !== $handler->getModelID() ) {
1346                         $converted = $content->convert( $handler->getModelID() );
1347
1348                         if ( !$converted ) {
1349                                 // TODO: somehow show a warning to the user!
1350                                 wfDebug( "Attempt to preload incompatible content: " .
1351                                         "can't convert " . $content->getModel() .
1352                                         " to " . $handler->getModelID() );
1353
1354                                 return $handler->makeEmptyContent();
1355                         }
1356
1357                         $content = $converted;
1358                 }
1359
1360                 return $content->preloadTransform( $title, $parserOptions, $params );
1361         }
1362
1363         /**
1364          * Make sure the form isn't faking a user's credentials.
1365          *
1366          * @param WebRequest $request
1367          * @return bool
1368          * @private
1369          */
1370         function tokenOk( &$request ) {
1371                 global $wgUser;
1372                 $token = $request->getVal( 'wpEditToken' );
1373                 $this->mTokenOk = $wgUser->matchEditToken( $token );
1374                 $this->mTokenOkExceptSuffix = $wgUser->matchEditTokenNoSuffix( $token );
1375                 return $this->mTokenOk;
1376         }
1377
1378         /**
1379          * Sets post-edit cookie indicating the user just saved a particular revision.
1380          *
1381          * This uses a temporary cookie for each revision ID so separate saves will never
1382          * interfere with each other.
1383          *
1384          * The cookie is deleted in the mediawiki.action.view.postEdit JS module after
1385          * the redirect.  It must be clearable by JavaScript code, so it must not be
1386          * marked HttpOnly. The JavaScript code converts the cookie to a wgPostEdit config
1387          * variable.
1388          *
1389          * If the variable were set on the server, it would be cached, which is unwanted
1390          * since the post-edit state should only apply to the load right after the save.
1391          *
1392          * @param int $statusValue The status value (to check for new article status)
1393          */
1394         protected function setPostEditCookie( $statusValue ) {
1395                 $revisionId = $this->page->getLatest();
1396                 $postEditKey = self::POST_EDIT_COOKIE_KEY_PREFIX . $revisionId;
1397
1398                 $val = 'saved';
1399                 if ( $statusValue == self::AS_SUCCESS_NEW_ARTICLE ) {
1400                         $val = 'created';
1401                 } elseif ( $this->oldid ) {
1402                         $val = 'restored';
1403                 }
1404
1405                 $response = RequestContext::getMain()->getRequest()->response();
1406                 $response->setCookie( $postEditKey, $val, time() + self::POST_EDIT_COOKIE_DURATION, [
1407                         'httpOnly' => false,
1408                 ] );
1409         }
1410
1411         /**
1412          * Attempt submission
1413          * @param array $resultDetails See docs for $result in internalAttemptSave
1414          * @throws UserBlockedError|ReadOnlyError|ThrottledError|PermissionsError
1415          * @return Status The resulting status object.
1416          */
1417         public function attemptSave( &$resultDetails = false ) {
1418                 global $wgUser;
1419
1420                 # Allow bots to exempt some edits from bot flagging
1421                 $bot = $wgUser->isAllowed( 'bot' ) && $this->bot;
1422                 $status = $this->internalAttemptSave( $resultDetails, $bot );
1423
1424                 Hooks::run( 'EditPage::attemptSave:after', [ $this, $status, $resultDetails ] );
1425
1426                 return $status;
1427         }
1428
1429         /**
1430          * Handle status, such as after attempt save
1431          *
1432          * @param Status $status
1433          * @param array|bool $resultDetails
1434          *
1435          * @throws ErrorPageError
1436          * @return bool False, if output is done, true if rest of the form should be displayed
1437          */
1438         private function handleStatus( Status $status, $resultDetails ) {
1439                 global $wgUser, $wgOut;
1440
1441                 /**
1442                  * @todo FIXME: once the interface for internalAttemptSave() is made
1443                  *   nicer, this should use the message in $status
1444                  */
1445                 if ( $status->value == self::AS_SUCCESS_UPDATE
1446                         || $status->value == self::AS_SUCCESS_NEW_ARTICLE
1447                 ) {
1448                         $this->didSave = true;
1449                         if ( !$resultDetails['nullEdit'] ) {
1450                                 $this->setPostEditCookie( $status->value );
1451                         }
1452                 }
1453
1454                 // "wpExtraQueryRedirect" is a hidden input to modify
1455                 // after save URL and is not used by actual edit form
1456                 $request = RequestContext::getMain()->getRequest();
1457                 $extraQueryRedirect = $request->getVal( 'wpExtraQueryRedirect' );
1458
1459                 switch ( $status->value ) {
1460                         case self::AS_HOOK_ERROR_EXPECTED:
1461                         case self::AS_CONTENT_TOO_BIG:
1462                         case self::AS_ARTICLE_WAS_DELETED:
1463                         case self::AS_CONFLICT_DETECTED:
1464                         case self::AS_SUMMARY_NEEDED:
1465                         case self::AS_TEXTBOX_EMPTY:
1466                         case self::AS_MAX_ARTICLE_SIZE_EXCEEDED:
1467                         case self::AS_END:
1468                         case self::AS_BLANK_ARTICLE:
1469                         case self::AS_SELF_REDIRECT:
1470                                 return true;
1471
1472                         case self::AS_HOOK_ERROR:
1473                                 return false;
1474
1475                         case self::AS_CANNOT_USE_CUSTOM_MODEL:
1476                         case self::AS_PARSE_ERROR:
1477                                 $wgOut->addWikiText( '<div class="error">' . "\n" . $status->getWikiText() . '</div>' );
1478                                 return true;
1479
1480                         case self::AS_SUCCESS_NEW_ARTICLE:
1481                                 $query = $resultDetails['redirect'] ? 'redirect=no' : '';
1482                                 if ( $extraQueryRedirect ) {
1483                                         if ( $query === '' ) {
1484                                                 $query = $extraQueryRedirect;
1485                                         } else {
1486                                                 $query = $query . '&' . $extraQueryRedirect;
1487                                         }
1488                                 }
1489                                 $anchor = isset( $resultDetails['sectionanchor'] ) ? $resultDetails['sectionanchor'] : '';
1490                                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $anchor );
1491                                 return false;
1492
1493                         case self::AS_SUCCESS_UPDATE:
1494                                 $extraQuery = '';
1495                                 $sectionanchor = $resultDetails['sectionanchor'];
1496
1497                                 // Give extensions a chance to modify URL query on update
1498                                 Hooks::run(
1499                                         'ArticleUpdateBeforeRedirect',
1500                                         [ $this->mArticle, &$sectionanchor, &$extraQuery ]
1501                                 );
1502
1503                                 if ( $resultDetails['redirect'] ) {
1504                                         if ( $extraQuery == '' ) {
1505                                                 $extraQuery = 'redirect=no';
1506                                         } else {
1507                                                 $extraQuery = 'redirect=no&' . $extraQuery;
1508                                         }
1509                                 }
1510                                 if ( $extraQueryRedirect ) {
1511                                         if ( $extraQuery === '' ) {
1512                                                 $extraQuery = $extraQueryRedirect;
1513                                         } else {
1514                                                 $extraQuery = $extraQuery . '&' . $extraQueryRedirect;
1515                                         }
1516                                 }
1517
1518                                 $wgOut->redirect( $this->mTitle->getFullURL( $extraQuery ) . $sectionanchor );
1519                                 return false;
1520
1521                         case self::AS_SPAM_ERROR:
1522                                 $this->spamPageWithContent( $resultDetails['spam'] );
1523                                 return false;
1524
1525                         case self::AS_BLOCKED_PAGE_FOR_USER:
1526                                 throw new UserBlockedError( $wgUser->getBlock() );
1527
1528                         case self::AS_IMAGE_REDIRECT_ANON:
1529                         case self::AS_IMAGE_REDIRECT_LOGGED:
1530                                 throw new PermissionsError( 'upload' );
1531
1532                         case self::AS_READ_ONLY_PAGE_ANON:
1533                         case self::AS_READ_ONLY_PAGE_LOGGED:
1534                                 throw new PermissionsError( 'edit' );
1535
1536                         case self::AS_READ_ONLY_PAGE:
1537                                 throw new ReadOnlyError;
1538
1539                         case self::AS_RATE_LIMITED:
1540                                 throw new ThrottledError();
1541
1542                         case self::AS_NO_CREATE_PERMISSION:
1543                                 $permission = $this->mTitle->isTalkPage() ? 'createtalk' : 'createpage';
1544                                 throw new PermissionsError( $permission );
1545
1546                         case self::AS_NO_CHANGE_CONTENT_MODEL:
1547                                 throw new PermissionsError( 'editcontentmodel' );
1548
1549                         default:
1550                                 // We don't recognize $status->value. The only way that can happen
1551                                 // is if an extension hook aborted from inside ArticleSave.
1552                                 // Render the status object into $this->hookError
1553                                 // FIXME this sucks, we should just use the Status object throughout
1554                                 $this->hookError = '<div class="error">' ."\n" . $status->getWikiText() .
1555                                         '</div>';
1556                                 return true;
1557                 }
1558         }
1559
1560         /**
1561          * Run hooks that can filter edits just before they get saved.
1562          *
1563          * @param Content $content The Content to filter.
1564          * @param Status $status For reporting the outcome to the caller
1565          * @param User $user The user performing the edit
1566          *
1567          * @return bool
1568          */
1569         protected function runPostMergeFilters( Content $content, Status $status, User $user ) {
1570                 // Run old style post-section-merge edit filter
1571                 if ( !ContentHandler::runLegacyHooks( 'EditFilterMerged',
1572                         [ $this, $content, &$this->hookError, $this->summary ] )
1573                 ) {
1574                         # Error messages etc. could be handled within the hook...
1575                         $status->fatal( 'hookaborted' );
1576                         $status->value = self::AS_HOOK_ERROR;
1577                         return false;
1578                 } elseif ( $this->hookError != '' ) {
1579                         # ...or the hook could be expecting us to produce an error
1580                         $status->fatal( 'hookaborted' );
1581                         $status->value = self::AS_HOOK_ERROR_EXPECTED;
1582                         return false;
1583                 }
1584
1585                 // Run new style post-section-merge edit filter
1586                 if ( !Hooks::run( 'EditFilterMergedContent',
1587                                 [ $this->mArticle->getContext(), $content, $status, $this->summary,
1588                                 $user, $this->minoredit ] )
1589                 ) {
1590                         # Error messages etc. could be handled within the hook...
1591                         if ( $status->isGood() ) {
1592                                 $status->fatal( 'hookaborted' );
1593                                 // Not setting $this->hookError here is a hack to allow the hook
1594                                 // to cause a return to the edit page without $this->hookError
1595                                 // being set. This is used by ConfirmEdit to display a captcha
1596                                 // without any error message cruft.
1597                         } else {
1598                                 $this->hookError = $status->getWikiText();
1599                         }
1600                         // Use the existing $status->value if the hook set it
1601                         if ( !$status->value ) {
1602                                 $status->value = self::AS_HOOK_ERROR;
1603                         }
1604                         return false;
1605                 } elseif ( !$status->isOK() ) {
1606                         # ...or the hook could be expecting us to produce an error
1607                         // FIXME this sucks, we should just use the Status object throughout
1608                         $this->hookError = $status->getWikiText();
1609                         $status->fatal( 'hookaborted' );
1610                         $status->value = self::AS_HOOK_ERROR_EXPECTED;
1611                         return false;
1612                 }
1613
1614                 return true;
1615         }
1616
1617         /**
1618          * Return the summary to be used for a new section.
1619          *
1620          * @param string $sectionanchor Set to the section anchor text
1621          * @return string
1622          */
1623         private function newSectionSummary( &$sectionanchor = null ) {
1624                 global $wgParser;
1625
1626                 if ( $this->sectiontitle !== '' ) {
1627                         $sectionanchor = $wgParser->guessLegacySectionNameFromWikiText( $this->sectiontitle );
1628                         // If no edit summary was specified, create one automatically from the section
1629                         // title and have it link to the new section. Otherwise, respect the summary as
1630                         // passed.
1631                         if ( $this->summary === '' ) {
1632                                 $cleanSectionTitle = $wgParser->stripSectionName( $this->sectiontitle );
1633                                 return wfMessage( 'newsectionsummary' )
1634                                         ->rawParams( $cleanSectionTitle )->inContentLanguage()->text();
1635                         }
1636                 } elseif ( $this->summary !== '' ) {
1637                         $sectionanchor = $wgParser->guessLegacySectionNameFromWikiText( $this->summary );
1638                         # This is a new section, so create a link to the new section
1639                         # in the revision summary.
1640                         $cleanSummary = $wgParser->stripSectionName( $this->summary );
1641                         return wfMessage( 'newsectionsummary' )
1642                                 ->rawParams( $cleanSummary )->inContentLanguage()->text();
1643                 }
1644                 return $this->summary;
1645         }
1646
1647         /**
1648          * Attempt submission (no UI)
1649          *
1650          * @param array $result Array to add statuses to, currently with the
1651          *   possible keys:
1652          *   - spam (string): Spam string from content if any spam is detected by
1653          *     matchSpamRegex.
1654          *   - sectionanchor (string): Section anchor for a section save.
1655          *   - nullEdit (boolean): Set if doEditContent is OK.  True if null edit,
1656          *     false otherwise.
1657          *   - redirect (bool): Set if doEditContent is OK. True if resulting
1658          *     revision is a redirect.
1659          * @param bool $bot True if edit is being made under the bot right.
1660          *
1661          * @return Status Status object, possibly with a message, but always with
1662          *   one of the AS_* constants in $status->value,
1663          *
1664          * @todo FIXME: This interface is TERRIBLE, but hard to get rid of due to
1665          *   various error display idiosyncrasies. There are also lots of cases
1666          *   where error metadata is set in the object and retrieved later instead
1667          *   of being returned, e.g. AS_CONTENT_TOO_BIG and
1668          *   AS_BLOCKED_PAGE_FOR_USER. All that stuff needs to be cleaned up some
1669          * time.
1670          */
1671         function internalAttemptSave( &$result, $bot = false ) {
1672                 global $wgUser, $wgRequest, $wgParser, $wgMaxArticleSize;
1673                 global $wgContentHandlerUseDB;
1674
1675                 $status = Status::newGood();
1676
1677                 if ( !Hooks::run( 'EditPage::attemptSave', [ $this ] ) ) {
1678                         wfDebug( "Hook 'EditPage::attemptSave' aborted article saving\n" );
1679                         $status->fatal( 'hookaborted' );
1680                         $status->value = self::AS_HOOK_ERROR;
1681                         return $status;
1682                 }
1683
1684                 $spam = $wgRequest->getText( 'wpAntispam' );
1685                 if ( $spam !== '' ) {
1686                         wfDebugLog(
1687                                 'SimpleAntiSpam',
1688                                 $wgUser->getName() .
1689                                 ' editing "' .
1690                                 $this->mTitle->getPrefixedText() .
1691                                 '" submitted bogus field "' .
1692                                 $spam .
1693                                 '"'
1694                         );
1695                         $status->fatal( 'spamprotectionmatch', false );
1696                         $status->value = self::AS_SPAM_ERROR;
1697                         return $status;
1698                 }
1699
1700                 try {
1701                         # Construct Content object
1702                         $textbox_content = $this->toEditContent( $this->textbox1 );
1703                 } catch ( MWContentSerializationException $ex ) {
1704                         $status->fatal(
1705                                 'content-failed-to-parse',
1706                                 $this->contentModel,
1707                                 $this->contentFormat,
1708                                 $ex->getMessage()
1709                         );
1710                         $status->value = self::AS_PARSE_ERROR;
1711                         return $status;
1712                 }
1713
1714                 # Check image redirect
1715                 if ( $this->mTitle->getNamespace() == NS_FILE &&
1716                         $textbox_content->isRedirect() &&
1717                         !$wgUser->isAllowed( 'upload' )
1718                 ) {
1719                                 $code = $wgUser->isAnon() ? self::AS_IMAGE_REDIRECT_ANON : self::AS_IMAGE_REDIRECT_LOGGED;
1720                                 $status->setResult( false, $code );
1721
1722                                 return $status;
1723                 }
1724
1725                 # Check for spam
1726                 $match = self::matchSummarySpamRegex( $this->summary );
1727                 if ( $match === false && $this->section == 'new' ) {
1728                         # $wgSpamRegex is enforced on this new heading/summary because, unlike
1729                         # regular summaries, it is added to the actual wikitext.
1730                         if ( $this->sectiontitle !== '' ) {
1731                                 # This branch is taken when the API is used with the 'sectiontitle' parameter.
1732                                 $match = self::matchSpamRegex( $this->sectiontitle );
1733                         } else {
1734                                 # This branch is taken when the "Add Topic" user interface is used, or the API
1735                                 # is used with the 'summary' parameter.
1736                                 $match = self::matchSpamRegex( $this->summary );
1737                         }
1738                 }
1739                 if ( $match === false ) {
1740                         $match = self::matchSpamRegex( $this->textbox1 );
1741                 }
1742                 if ( $match !== false ) {
1743                         $result['spam'] = $match;
1744                         $ip = $wgRequest->getIP();
1745                         $pdbk = $this->mTitle->getPrefixedDBkey();
1746                         $match = str_replace( "\n", '', $match );
1747                         wfDebugLog( 'SpamRegex', "$ip spam regex hit [[$pdbk]]: \"$match\"" );
1748                         $status->fatal( 'spamprotectionmatch', $match );
1749                         $status->value = self::AS_SPAM_ERROR;
1750                         return $status;
1751                 }
1752                 if ( !Hooks::run(
1753                         'EditFilter',
1754                         [ $this, $this->textbox1, $this->section, &$this->hookError, $this->summary ] )
1755                 ) {
1756                         # Error messages etc. could be handled within the hook...
1757                         $status->fatal( 'hookaborted' );
1758                         $status->value = self::AS_HOOK_ERROR;
1759                         return $status;
1760                 } elseif ( $this->hookError != '' ) {
1761                         # ...or the hook could be expecting us to produce an error
1762                         $status->fatal( 'hookaborted' );
1763                         $status->value = self::AS_HOOK_ERROR_EXPECTED;
1764                         return $status;
1765                 }
1766
1767                 if ( $wgUser->isBlockedFrom( $this->mTitle, false ) ) {
1768                         // Auto-block user's IP if the account was "hard" blocked
1769                         if ( !wfReadOnly() ) {
1770                                 $wgUser->spreadAnyEditBlock();
1771                         }
1772                         # Check block state against master, thus 'false'.
1773                         $status->setResult( false, self::AS_BLOCKED_PAGE_FOR_USER );
1774                         return $status;
1775                 }
1776
1777                 $this->contentLength = strlen( $this->textbox1 );
1778                 if ( $this->contentLength > $wgMaxArticleSize * 1024 ) {
1779                         // Error will be displayed by showEditForm()
1780                         $this->tooBig = true;
1781                         $status->setResult( false, self::AS_CONTENT_TOO_BIG );
1782                         return $status;
1783                 }
1784
1785                 if ( !$wgUser->isAllowed( 'edit' ) ) {
1786                         if ( $wgUser->isAnon() ) {
1787                                 $status->setResult( false, self::AS_READ_ONLY_PAGE_ANON );
1788                                 return $status;
1789                         } else {
1790                                 $status->fatal( 'readonlytext' );
1791                                 $status->value = self::AS_READ_ONLY_PAGE_LOGGED;
1792                                 return $status;
1793                         }
1794                 }
1795
1796                 $changingContentModel = false;
1797                 if ( $this->contentModel !== $this->mTitle->getContentModel() ) {
1798                         if ( !$wgContentHandlerUseDB ) {
1799                                 $status->fatal( 'editpage-cannot-use-custom-model' );
1800                                 $status->value = self::AS_CANNOT_USE_CUSTOM_MODEL;
1801                                 return $status;
1802                         } elseif ( !$wgUser->isAllowed( 'editcontentmodel' ) ) {
1803                                 $status->setResult( false, self::AS_NO_CHANGE_CONTENT_MODEL );
1804                                 return $status;
1805
1806                         }
1807                         $changingContentModel = true;
1808                         $oldContentModel = $this->mTitle->getContentModel();
1809                 }
1810
1811                 if ( $this->changeTags ) {
1812                         $changeTagsStatus = ChangeTags::canAddTagsAccompanyingChange(
1813                                 $this->changeTags, $wgUser );
1814                         if ( !$changeTagsStatus->isOK() ) {
1815                                 $changeTagsStatus->value = self::AS_CHANGE_TAG_ERROR;
1816                                 return $changeTagsStatus;
1817                         }
1818                 }
1819
1820                 if ( wfReadOnly() ) {
1821                         $status->fatal( 'readonlytext' );
1822                         $status->value = self::AS_READ_ONLY_PAGE;
1823                         return $status;
1824                 }
1825                 if ( $wgUser->pingLimiter() || $wgUser->pingLimiter( 'linkpurge', 0 ) ) {
1826                         $status->fatal( 'actionthrottledtext' );
1827                         $status->value = self::AS_RATE_LIMITED;
1828                         return $status;
1829                 }
1830
1831                 # If the article has been deleted while editing, don't save it without
1832                 # confirmation
1833                 if ( $this->wasDeletedSinceLastEdit() && !$this->recreate ) {
1834                         $status->setResult( false, self::AS_ARTICLE_WAS_DELETED );
1835                         return $status;
1836                 }
1837
1838                 # Load the page data from the master. If anything changes in the meantime,
1839                 # we detect it by using page_latest like a token in a 1 try compare-and-swap.
1840                 $this->page->loadPageData( 'fromdbmaster' );
1841                 $new = !$this->page->exists();
1842
1843                 if ( $new ) {
1844                         // Late check for create permission, just in case *PARANOIA*
1845                         if ( !$this->mTitle->userCan( 'create', $wgUser ) ) {
1846                                 $status->fatal( 'nocreatetext' );
1847                                 $status->value = self::AS_NO_CREATE_PERMISSION;
1848                                 wfDebug( __METHOD__ . ": no create permission\n" );
1849                                 return $status;
1850                         }
1851
1852                         // Don't save a new page if it's blank or if it's a MediaWiki:
1853                         // message with content equivalent to default (allow empty pages
1854                         // in this case to disable messages, see bug 50124)
1855                         $defaultMessageText = $this->mTitle->getDefaultMessageText();
1856                         if ( $this->mTitle->getNamespace() === NS_MEDIAWIKI && $defaultMessageText !== false ) {
1857                                 $defaultText = $defaultMessageText;
1858                         } else {
1859                                 $defaultText = '';
1860                         }
1861
1862                         if ( !$this->allowBlankArticle && $this->textbox1 === $defaultText ) {
1863                                 $this->blankArticle = true;
1864                                 $status->fatal( 'blankarticle' );
1865                                 $status->setResult( false, self::AS_BLANK_ARTICLE );
1866                                 return $status;
1867                         }
1868
1869                         if ( !$this->runPostMergeFilters( $textbox_content, $status, $wgUser ) ) {
1870                                 return $status;
1871                         }
1872
1873                         $content = $textbox_content;
1874
1875                         $result['sectionanchor'] = '';
1876                         if ( $this->section == 'new' ) {
1877                                 if ( $this->sectiontitle !== '' ) {
1878                                         // Insert the section title above the content.
1879                                         $content = $content->addSectionHeader( $this->sectiontitle );
1880                                 } elseif ( $this->summary !== '' ) {
1881                                         // Insert the section title above the content.
1882                                         $content = $content->addSectionHeader( $this->summary );
1883                                 }
1884                                 $this->summary = $this->newSectionSummary( $result['sectionanchor'] );
1885                         }
1886
1887                         $status->value = self::AS_SUCCESS_NEW_ARTICLE;
1888
1889                 } else { # not $new
1890
1891                         # Article exists. Check for edit conflict.
1892
1893                         $this->page->clear(); # Force reload of dates, etc.
1894                         $timestamp = $this->page->getTimestamp();
1895                         $latest = $this->page->getLatest();
1896
1897                         wfDebug( "timestamp: {$timestamp}, edittime: {$this->edittime}\n" );
1898
1899                         // Check editRevId if set, which handles same-second timestamp collisions
1900                         if ( $timestamp != $this->edittime
1901                                 || ( $this->editRevId !== null && $this->editRevId != $latest )
1902                         ) {
1903                                 $this->isConflict = true;
1904                                 if ( $this->section == 'new' ) {
1905                                         if ( $this->page->getUserText() == $wgUser->getName() &&
1906                                                 $this->page->getComment() == $this->newSectionSummary()
1907                                         ) {
1908                                                 // Probably a duplicate submission of a new comment.
1909                                                 // This can happen when CDN resends a request after
1910                                                 // a timeout but the first one actually went through.
1911                                                 wfDebug( __METHOD__
1912                                                         . ": duplicate new section submission; trigger edit conflict!\n" );
1913                                         } else {
1914                                                 // New comment; suppress conflict.
1915                                                 $this->isConflict = false;
1916                                                 wfDebug( __METHOD__ . ": conflict suppressed; new section\n" );
1917                                         }
1918                                 } elseif ( $this->section == ''
1919                                         && Revision::userWasLastToEdit(
1920                                                 DB_MASTER, $this->mTitle->getArticleID(),
1921                                                 $wgUser->getId(), $this->edittime
1922                                         )
1923                                 ) {
1924                                         # Suppress edit conflict with self, except for section edits where merging is required.
1925                                         wfDebug( __METHOD__ . ": Suppressing edit conflict, same user.\n" );
1926                                         $this->isConflict = false;
1927                                 }
1928                         }
1929
1930                         // If sectiontitle is set, use it, otherwise use the summary as the section title.
1931                         if ( $this->sectiontitle !== '' ) {
1932                                 $sectionTitle = $this->sectiontitle;
1933                         } else {
1934                                 $sectionTitle = $this->summary;
1935                         }
1936
1937                         $content = null;
1938
1939                         if ( $this->isConflict ) {
1940                                 wfDebug( __METHOD__
1941                                         . ": conflict! getting section '{$this->section}' for time '{$this->edittime}'"
1942                                         . " (id '{$this->editRevId}') (article time '{$timestamp}')\n" );
1943                                 // @TODO: replaceSectionAtRev() with base ID (not prior current) for ?oldid=X case
1944                                 // ...or disable section editing for non-current revisions (not exposed anyway).
1945                                 if ( $this->editRevId !== null ) {
1946                                         $content = $this->page->replaceSectionAtRev(
1947                                                 $this->section,
1948                                                 $textbox_content,
1949                                                 $sectionTitle,
1950                                                 $this->editRevId
1951                                         );
1952                                 } else {
1953                                         $content = $this->page->replaceSectionContent(
1954                                                 $this->section,
1955                                                 $textbox_content,
1956                                                 $sectionTitle,
1957                                                 $this->edittime
1958                                         );
1959                                 }
1960                         } else {
1961                                 wfDebug( __METHOD__ . ": getting section '{$this->section}'\n" );
1962                                 $content = $this->page->replaceSectionContent(
1963                                         $this->section,
1964                                         $textbox_content,
1965                                         $sectionTitle
1966                                 );
1967                         }
1968
1969                         if ( is_null( $content ) ) {
1970                                 wfDebug( __METHOD__ . ": activating conflict; section replace failed.\n" );
1971                                 $this->isConflict = true;
1972                                 $content = $textbox_content; // do not try to merge here!
1973                         } elseif ( $this->isConflict ) {
1974                                 # Attempt merge
1975                                 if ( $this->mergeChangesIntoContent( $content ) ) {
1976                                         // Successful merge! Maybe we should tell the user the good news?
1977                                         $this->isConflict = false;
1978                                         wfDebug( __METHOD__ . ": Suppressing edit conflict, successful merge.\n" );
1979                                 } else {
1980                                         $this->section = '';
1981                                         $this->textbox1 = ContentHandler::getContentText( $content );
1982                                         wfDebug( __METHOD__ . ": Keeping edit conflict, failed merge.\n" );
1983                                 }
1984                         }
1985
1986                         if ( $this->isConflict ) {
1987                                 $status->setResult( false, self::AS_CONFLICT_DETECTED );
1988                                 return $status;
1989                         }
1990
1991                         if ( !$this->runPostMergeFilters( $content, $status, $wgUser ) ) {
1992                                 return $status;
1993                         }
1994
1995                         if ( $this->section == 'new' ) {
1996                                 // Handle the user preference to force summaries here
1997                                 if ( !$this->allowBlankSummary && trim( $this->summary ) == '' ) {
1998                                         $this->missingSummary = true;
1999                                         $status->fatal( 'missingsummary' ); // or 'missingcommentheader' if $section == 'new'. Blegh
2000                                         $status->value = self::AS_SUMMARY_NEEDED;
2001                                         return $status;
2002                                 }
2003
2004                                 // Do not allow the user to post an empty comment
2005                                 if ( $this->textbox1 == '' ) {
2006                                         $this->missingComment = true;
2007                                         $status->fatal( 'missingcommenttext' );
2008                                         $status->value = self::AS_TEXTBOX_EMPTY;
2009                                         return $status;
2010                                 }
2011                         } elseif ( !$this->allowBlankSummary
2012                                 && !$content->equals( $this->getOriginalContent( $wgUser ) )
2013                                 && !$content->isRedirect()
2014                                 && md5( $this->summary ) == $this->autoSumm
2015                         ) {
2016                                 $this->missingSummary = true;
2017                                 $status->fatal( 'missingsummary' );
2018                                 $status->value = self::AS_SUMMARY_NEEDED;
2019                                 return $status;
2020                         }
2021
2022                         # All's well
2023                         $sectionanchor = '';
2024                         if ( $this->section == 'new' ) {
2025                                 $this->summary = $this->newSectionSummary( $sectionanchor );
2026                         } elseif ( $this->section != '' ) {
2027                                 # Try to get a section anchor from the section source, redirect
2028                                 # to edited section if header found.
2029                                 # XXX: Might be better to integrate this into Article::replaceSectionAtRev
2030                                 # for duplicate heading checking and maybe parsing.
2031                                 $hasmatch = preg_match( "/^ *([=]{1,6})(.*?)(\\1) *\\n/i", $this->textbox1, $matches );
2032                                 # We can't deal with anchors, includes, html etc in the header for now,
2033                                 # headline would need to be parsed to improve this.
2034                                 if ( $hasmatch && strlen( $matches[2] ) > 0 ) {
2035                                         $sectionanchor = $wgParser->guessLegacySectionNameFromWikiText( $matches[2] );
2036                                 }
2037                         }
2038                         $result['sectionanchor'] = $sectionanchor;
2039
2040                         // Save errors may fall down to the edit form, but we've now
2041                         // merged the section into full text. Clear the section field
2042                         // so that later submission of conflict forms won't try to
2043                         // replace that into a duplicated mess.
2044                         $this->textbox1 = $this->toEditText( $content );
2045                         $this->section = '';
2046
2047                         $status->value = self::AS_SUCCESS_UPDATE;
2048                 }
2049
2050                 if ( !$this->allowSelfRedirect
2051                         && $content->isRedirect()
2052                         && $content->getRedirectTarget()->equals( $this->getTitle() )
2053                 ) {
2054                         // If the page already redirects to itself, don't warn.
2055                         $currentTarget = $this->getCurrentContent()->getRedirectTarget();
2056                         if ( !$currentTarget || !$currentTarget->equals( $this->getTitle() ) ) {
2057                                 $this->selfRedirect = true;
2058                                 $status->fatal( 'selfredirect' );
2059                                 $status->value = self::AS_SELF_REDIRECT;
2060                                 return $status;
2061                         }
2062                 }
2063
2064                 // Check for length errors again now that the section is merged in
2065                 $this->contentLength = strlen( $this->toEditText( $content ) );
2066                 if ( $this->contentLength > $wgMaxArticleSize * 1024 ) {
2067                         $this->tooBig = true;
2068                         $status->setResult( false, self::AS_MAX_ARTICLE_SIZE_EXCEEDED );
2069                         return $status;
2070                 }
2071
2072                 $flags = EDIT_AUTOSUMMARY |
2073                         ( $new ? EDIT_NEW : EDIT_UPDATE ) |
2074                         ( ( $this->minoredit && !$this->isNew ) ? EDIT_MINOR : 0 ) |
2075                         ( $bot ? EDIT_FORCE_BOT : 0 );
2076
2077                 $doEditStatus = $this->page->doEditContent(
2078                         $content,
2079                         $this->summary,
2080                         $flags,
2081                         false,
2082                         $wgUser,
2083                         $content->getDefaultFormat(),
2084                         $this->changeTags
2085                 );
2086
2087                 if ( !$doEditStatus->isOK() ) {
2088                         // Failure from doEdit()
2089                         // Show the edit conflict page for certain recognized errors from doEdit(),
2090                         // but don't show it for errors from extension hooks
2091                         $errors = $doEditStatus->getErrorsArray();
2092                         if ( in_array( $errors[0][0],
2093                                         [ 'edit-gone-missing', 'edit-conflict', 'edit-already-exists' ] )
2094                         ) {
2095                                 $this->isConflict = true;
2096                                 // Destroys data doEdit() put in $status->value but who cares
2097                                 $doEditStatus->value = self::AS_END;
2098                         }
2099                         return $doEditStatus;
2100                 }
2101
2102                 $result['nullEdit'] = $doEditStatus->hasMessage( 'edit-no-change' );
2103                 if ( $result['nullEdit'] ) {
2104                         // We don't know if it was a null edit until now, so increment here
2105                         $wgUser->pingLimiter( 'linkpurge' );
2106                 }
2107                 $result['redirect'] = $content->isRedirect();
2108
2109                 $this->updateWatchlist();
2110
2111                 // If the content model changed, add a log entry
2112                 if ( $changingContentModel ) {
2113                         $this->addContentModelChangeLogEntry(
2114                                 $wgUser,
2115                                 $new ? false : $oldContentModel,
2116                                 $this->contentModel,
2117                                 $this->summary
2118                         );
2119                 }
2120
2121                 return $status;
2122         }
2123
2124         /**
2125          * @param User $user
2126          * @param string|false $oldModel false if the page is being newly created
2127          * @param string $newModel
2128          * @param string $reason
2129          */
2130         protected function addContentModelChangeLogEntry( User $user, $oldModel, $newModel, $reason ) {
2131                 $new = $oldModel === false;
2132                 $log = new ManualLogEntry( 'contentmodel', $new ? 'new' : 'change' );
2133                 $log->setPerformer( $user );
2134                 $log->setTarget( $this->mTitle );
2135                 $log->setComment( $reason );
2136                 $log->setParameters( [
2137                         '4::oldmodel' => $oldModel,
2138                         '5::newmodel' => $newModel
2139                 ] );
2140                 $logid = $log->insert();
2141                 $log->publish( $logid );
2142         }
2143
2144         /**
2145          * Register the change of watch status
2146          */
2147         protected function updateWatchlist() {
2148                 global $wgUser;
2149
2150                 if ( !$wgUser->isLoggedIn() ) {
2151                         return;
2152                 }
2153
2154                 $user = $wgUser;
2155                 $title = $this->mTitle;
2156                 $watch = $this->watchthis;
2157                 // Do this in its own transaction to reduce contention...
2158                 DeferredUpdates::addCallableUpdate( function () use ( $user, $title, $watch ) {
2159                         if ( $watch == $user->isWatched( $title, User::IGNORE_USER_RIGHTS ) ) {
2160                                 return; // nothing to change
2161                         }
2162                         WatchAction::doWatchOrUnwatch( $watch, $title, $user );
2163                 } );
2164         }
2165
2166         /**
2167          * Attempts to do 3-way merge of edit content with a base revision
2168          * and current content, in case of edit conflict, in whichever way appropriate
2169          * for the content type.
2170          *
2171          * @since 1.21
2172          *
2173          * @param Content $editContent
2174          *
2175          * @return bool
2176          */
2177         private function mergeChangesIntoContent( &$editContent ) {
2178
2179                 $db = wfGetDB( DB_MASTER );
2180
2181                 // This is the revision the editor started from
2182                 $baseRevision = $this->getBaseRevision();
2183                 $baseContent = $baseRevision ? $baseRevision->getContent() : null;
2184
2185                 if ( is_null( $baseContent ) ) {
2186                         return false;
2187                 }
2188
2189                 // The current state, we want to merge updates into it
2190                 $currentRevision = Revision::loadFromTitle( $db, $this->mTitle );
2191                 $currentContent = $currentRevision ? $currentRevision->getContent() : null;
2192
2193                 if ( is_null( $currentContent ) ) {
2194                         return false;
2195                 }
2196
2197                 $handler = ContentHandler::getForModelID( $baseContent->getModel() );
2198
2199                 $result = $handler->merge3( $baseContent, $editContent, $currentContent );
2200
2201                 if ( $result ) {
2202                         $editContent = $result;
2203                         // Update parentRevId to what we just merged.
2204                         $this->parentRevId = $currentRevision->getId();
2205                         return true;
2206                 }
2207
2208                 return false;
2209         }
2210
2211         /**
2212          * @note: this method is very poorly named. If the user opened the form with ?oldid=X,
2213          *        one might think of X as the "base revision", which is NOT what this returns.
2214          * @return Revision Current version when the edit was started
2215          */
2216         function getBaseRevision() {
2217                 if ( !$this->mBaseRevision ) {
2218                         $db = wfGetDB( DB_MASTER );
2219                         $this->mBaseRevision = $this->editRevId
2220                                 ? Revision::newFromId( $this->editRevId, Revision::READ_LATEST )
2221                                 : Revision::loadFromTimestamp( $db, $this->mTitle, $this->edittime );
2222                 }
2223                 return $this->mBaseRevision;
2224         }
2225
2226         /**
2227          * Check given input text against $wgSpamRegex, and return the text of the first match.
2228          *
2229          * @param string $text
2230          *
2231          * @return string|bool Matching string or false
2232          */
2233         public static function matchSpamRegex( $text ) {
2234                 global $wgSpamRegex;
2235                 // For back compatibility, $wgSpamRegex may be a single string or an array of regexes.
2236                 $regexes = (array)$wgSpamRegex;
2237                 return self::matchSpamRegexInternal( $text, $regexes );
2238         }
2239
2240         /**
2241          * Check given input text against $wgSummarySpamRegex, and return the text of the first match.
2242          *
2243          * @param string $text
2244          *
2245          * @return string|bool Matching string or false
2246          */
2247         public static function matchSummarySpamRegex( $text ) {
2248                 global $wgSummarySpamRegex;
2249                 $regexes = (array)$wgSummarySpamRegex;
2250                 return self::matchSpamRegexInternal( $text, $regexes );
2251         }
2252
2253         /**
2254          * @param string $text
2255          * @param array $regexes
2256          * @return bool|string
2257          */
2258         protected static function matchSpamRegexInternal( $text, $regexes ) {
2259                 foreach ( $regexes as $regex ) {
2260                         $matches = [];
2261                         if ( preg_match( $regex, $text, $matches ) ) {
2262                                 return $matches[0];
2263                         }
2264                 }
2265                 return false;
2266         }
2267
2268         function setHeaders() {
2269                 global $wgOut, $wgUser, $wgAjaxEditStash;
2270
2271                 $wgOut->addModules( 'mediawiki.action.edit' );
2272                 $wgOut->addModuleStyles( 'mediawiki.action.edit.styles' );
2273
2274                 if ( $wgUser->getOption( 'showtoolbar' ) ) {
2275                         // The addition of default buttons is handled by getEditToolbar() which
2276                         // has its own dependency on this module. The call here ensures the module
2277                         // is loaded in time (it has position "top") for other modules to register
2278                         // buttons (e.g. extensions, gadgets, user scripts).
2279                         $wgOut->addModules( 'mediawiki.toolbar' );
2280                 }
2281
2282                 if ( $wgUser->getOption( 'uselivepreview' ) ) {
2283                         $wgOut->addModules( 'mediawiki.action.edit.preview' );
2284                 }
2285
2286                 if ( $wgUser->getOption( 'useeditwarning' ) ) {
2287                         $wgOut->addModules( 'mediawiki.action.edit.editWarning' );
2288                 }
2289
2290                 # Enabled article-related sidebar, toplinks, etc.
2291                 $wgOut->setArticleRelated( true );
2292
2293                 $contextTitle = $this->getContextTitle();
2294                 if ( $this->isConflict ) {
2295                         $msg = 'editconflict';
2296                 } elseif ( $contextTitle->exists() && $this->section != '' ) {
2297                         $msg = $this->section == 'new' ? 'editingcomment' : 'editingsection';
2298                 } else {
2299                         $msg = $contextTitle->exists()
2300                                 || ( $contextTitle->getNamespace() == NS_MEDIAWIKI
2301                                         && $contextTitle->getDefaultMessageText() !== false
2302                                 )
2303                                 ? 'editing'
2304                                 : 'creating';
2305                 }
2306
2307                 # Use the title defined by DISPLAYTITLE magic word when present
2308                 # NOTE: getDisplayTitle() returns HTML while getPrefixedText() returns plain text.
2309                 #       setPageTitle() treats the input as wikitext, which should be safe in either case.
2310                 $displayTitle = isset( $this->mParserOutput ) ? $this->mParserOutput->getDisplayTitle() : false;
2311                 if ( $displayTitle === false ) {
2312                         $displayTitle = $contextTitle->getPrefixedText();
2313                 }
2314                 $wgOut->setPageTitle( wfMessage( $msg, $displayTitle ) );
2315                 # Transmit the name of the message to JavaScript for live preview
2316                 # Keep Resources.php/mediawiki.action.edit.preview in sync with the possible keys
2317                 $wgOut->addJsConfigVars( [
2318                         'wgEditMessage' => $msg,
2319                         'wgAjaxEditStash' => $wgAjaxEditStash,
2320                 ] );
2321         }
2322
2323         /**
2324          * Show all applicable editing introductions
2325          */
2326         protected function showIntro() {
2327                 global $wgOut, $wgUser;
2328                 if ( $this->suppressIntro ) {
2329                         return;
2330                 }
2331
2332                 $namespace = $this->mTitle->getNamespace();
2333
2334                 if ( $namespace == NS_MEDIAWIKI ) {
2335                         # Show a warning if editing an interface message
2336                         $wgOut->wrapWikiMsg( "<div class='mw-editinginterface'>\n$1\n</div>", 'editinginterface' );
2337                         # If this is a default message (but not css or js),
2338                         # show a hint that it is translatable on translatewiki.net
2339                         if ( !$this->mTitle->hasContentModel( CONTENT_MODEL_CSS )
2340                                 && !$this->mTitle->hasContentModel( CONTENT_MODEL_JAVASCRIPT )
2341                         ) {
2342                                 $defaultMessageText = $this->mTitle->getDefaultMessageText();
2343                                 if ( $defaultMessageText !== false ) {
2344                                         $wgOut->wrapWikiMsg( "<div class='mw-translateinterface'>\n$1\n</div>",
2345                                                 'translateinterface' );
2346                                 }
2347                         }
2348                 } elseif ( $namespace == NS_FILE ) {
2349                         # Show a hint to shared repo
2350                         $file = wfFindFile( $this->mTitle );
2351                         if ( $file && !$file->isLocal() ) {
2352                                 $descUrl = $file->getDescriptionUrl();
2353                                 # there must be a description url to show a hint to shared repo
2354                                 if ( $descUrl ) {
2355                                         if ( !$this->mTitle->exists() ) {
2356                                                 $wgOut->wrapWikiMsg( "<div class=\"mw-sharedupload-desc-create\">\n$1\n</div>", [
2357                                                                         'sharedupload-desc-create', $file->getRepo()->getDisplayName(), $descUrl
2358                                                 ] );
2359                                         } else {
2360                                                 $wgOut->wrapWikiMsg( "<div class=\"mw-sharedupload-desc-edit\">\n$1\n</div>", [
2361                                                                         'sharedupload-desc-edit', $file->getRepo()->getDisplayName(), $descUrl
2362                                                 ] );
2363                                         }
2364                                 }
2365                         }
2366                 }
2367
2368                 # Show a warning message when someone creates/edits a user (talk) page but the user does not exist
2369                 # Show log extract when the user is currently blocked
2370                 if ( $namespace == NS_USER || $namespace == NS_USER_TALK ) {
2371                         $username = explode( '/', $this->mTitle->getText(), 2 )[0];
2372                         $user = User::newFromName( $username, false /* allow IP users*/ );
2373                         $ip = User::isIP( $username );
2374                         $block = Block::newFromTarget( $user, $user );
2375                         if ( !( $user && $user->isLoggedIn() ) && !$ip ) { # User does not exist
2376                                 $wgOut->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n$1\n</div>",
2377                                         [ 'userpage-userdoesnotexist', wfEscapeWikiText( $username ) ] );
2378                         } elseif ( !is_null( $block ) && $block->getType() != Block::TYPE_AUTO ) {
2379                                 # Show log extract if the user is currently blocked
2380                                 LogEventsList::showLogExtract(
2381                                         $wgOut,
2382                                         'block',
2383                                         MWNamespace::getCanonicalName( NS_USER ) . ':' . $block->getTarget(),
2384                                         '',
2385                                         [
2386                                                 'lim' => 1,
2387                                                 'showIfEmpty' => false,
2388                                                 'msgKey' => [
2389                                                         'blocked-notice-logextract',
2390                                                         $user->getName() # Support GENDER in notice
2391                                                 ]
2392                                         ]
2393                                 );
2394                         }
2395                 }
2396                 # Try to add a custom edit intro, or use the standard one if this is not possible.
2397                 if ( !$this->showCustomIntro() && !$this->mTitle->exists() ) {
2398                         $helpLink = wfExpandUrl( Skin::makeInternalOrExternalUrl(
2399                                 wfMessage( 'helppage' )->inContentLanguage()->text()
2400                         ) );
2401                         if ( $wgUser->isLoggedIn() ) {
2402                                 $wgOut->wrapWikiMsg(
2403                                         // Suppress the external link icon, consider the help url an internal one
2404                                         "<div class=\"mw-newarticletext plainlinks\">\n$1\n</div>",
2405                                         [
2406                                                 'newarticletext',
2407                                                 $helpLink
2408                                         ]
2409                                 );
2410                         } else {
2411                                 $wgOut->wrapWikiMsg(
2412                                         // Suppress the external link icon, consider the help url an internal one
2413                                         "<div class=\"mw-newarticletextanon plainlinks\">\n$1\n</div>",
2414                                         [
2415                                                 'newarticletextanon',
2416                                                 $helpLink
2417                                         ]
2418                                 );
2419                         }
2420                 }
2421                 # Give a notice if the user is editing a deleted/moved page...
2422                 if ( !$this->mTitle->exists() ) {
2423                         LogEventsList::showLogExtract( $wgOut, [ 'delete', 'move' ], $this->mTitle,
2424                                 '',
2425                                 [
2426                                         'lim' => 10,
2427                                         'conds' => [ "log_action != 'revision'" ],
2428                                         'showIfEmpty' => false,
2429                                         'msgKey' => [ 'recreate-moveddeleted-warn' ]
2430                                 ]
2431                         );
2432                 }
2433         }
2434
2435         /**
2436          * Attempt to show a custom editing introduction, if supplied
2437          *
2438          * @return bool
2439          */
2440         protected function showCustomIntro() {
2441                 if ( $this->editintro ) {
2442                         $title = Title::newFromText( $this->editintro );
2443                         if ( $title instanceof Title && $title->exists() && $title->userCan( 'read' ) ) {
2444                                 global $wgOut;
2445                                 // Added using template syntax, to take <noinclude>'s into account.
2446                                 $wgOut->addWikiTextTitleTidy(
2447                                         '<div class="mw-editintro">{{:' . $title->getFullText() . '}}</div>',
2448                                         $this->mTitle
2449                                 );
2450                                 return true;
2451                         }
2452                 }
2453                 return false;
2454         }
2455
2456         /**
2457          * Gets an editable textual representation of $content.
2458          * The textual representation can be turned by into a Content object by the
2459          * toEditContent() method.
2460          *
2461          * If $content is null or false or a string, $content is returned unchanged.
2462          *
2463          * If the given Content object is not of a type that can be edited using
2464          * the text base EditPage, an exception will be raised. Set
2465          * $this->allowNonTextContent to true to allow editing of non-textual
2466          * content.
2467          *
2468          * @param Content|null|bool|string $content
2469          * @return string The editable text form of the content.
2470          *
2471          * @throws MWException If $content is not an instance of TextContent and
2472          *   $this->allowNonTextContent is not true.
2473          */
2474         protected function toEditText( $content ) {
2475                 if ( $content === null || $content === false || is_string( $content ) ) {
2476                         return $content;
2477                 }
2478
2479                 if ( !$this->isSupportedContentModel( $content->getModel() ) ) {
2480                         throw new MWException( 'This content model is not supported: '
2481                                 . ContentHandler::getLocalizedName( $content->getModel() ) );
2482                 }
2483
2484                 return $content->serialize( $this->contentFormat );
2485         }
2486
2487         /**
2488          * Turns the given text into a Content object by unserializing it.
2489          *
2490          * If the resulting Content object is not of a type that can be edited using
2491          * the text base EditPage, an exception will be raised. Set
2492          * $this->allowNonTextContent to true to allow editing of non-textual
2493          * content.
2494          *
2495          * @param string|null|bool $text Text to unserialize
2496          * @return Content The content object created from $text. If $text was false
2497          *   or null, false resp. null will be  returned instead.
2498          *
2499          * @throws MWException If unserializing the text results in a Content
2500          *   object that is not an instance of TextContent and
2501          *   $this->allowNonTextContent is not true.
2502          */
2503         protected function toEditContent( $text ) {
2504                 if ( $text === false || $text === null ) {
2505                         return $text;
2506                 }
2507
2508                 $content = ContentHandler::makeContent( $text, $this->getTitle(),
2509                         $this->contentModel, $this->contentFormat );
2510
2511                 if ( !$this->isSupportedContentModel( $content->getModel() ) ) {
2512                         throw new MWException( 'This content model is not supported: '
2513                                 . ContentHandler::getLocalizedName( $content->getModel() ) );
2514                 }
2515
2516                 return $content;
2517         }
2518
2519         /**
2520          * Send the edit form and related headers to $wgOut
2521          * @param callable|null $formCallback That takes an OutputPage parameter; will be called
2522          *     during form output near the top, for captchas and the like.
2523          *
2524          * The $formCallback parameter is deprecated since MediaWiki 1.25. Please
2525          * use the EditPage::showEditForm:fields hook instead.
2526          */
2527         function showEditForm( $formCallback = null ) {
2528                 global $wgOut, $wgUser;
2529
2530                 # need to parse the preview early so that we know which templates are used,
2531                 # otherwise users with "show preview after edit box" will get a blank list
2532                 # we parse this near the beginning so that setHeaders can do the title
2533                 # setting work instead of leaving it in getPreviewText
2534                 $previewOutput = '';
2535                 if ( $this->formtype == 'preview' ) {
2536                         $previewOutput = $this->getPreviewText();
2537                 }
2538
2539                 Hooks::run( 'EditPage::showEditForm:initial', [ &$this, &$wgOut ] );
2540
2541                 $this->setHeaders();
2542
2543                 if ( $this->showHeader() === false ) {
2544                         return;
2545                 }
2546
2547                 $wgOut->addHTML( $this->editFormPageTop );
2548
2549                 if ( $wgUser->getOption( 'previewontop' ) ) {
2550                         $this->displayPreviewArea( $previewOutput, true );
2551                 }
2552
2553                 $wgOut->addHTML( $this->editFormTextTop );
2554
2555                 $showToolbar = true;
2556                 if ( $this->wasDeletedSinceLastEdit() ) {
2557                         if ( $this->formtype == 'save' ) {
2558                                 // Hide the toolbar and edit area, user can click preview to get it back
2559                                 // Add an confirmation checkbox and explanation.
2560                                 $showToolbar = false;
2561                         } else {
2562                                 $wgOut->wrapWikiMsg( "<div class='error mw-deleted-while-editing'>\n$1\n</div>",
2563                                         'deletedwhileediting' );
2564                         }
2565                 }
2566
2567                 // @todo add EditForm plugin interface and use it here!
2568                 //       search for textarea1 and textares2, and allow EditForm to override all uses.
2569                 $wgOut->addHTML( Html::openElement(
2570                         'form',
2571                         [
2572                                 'id' => self::EDITFORM_ID,
2573                                 'name' => self::EDITFORM_ID,
2574                                 'method' => 'post',
2575                                 'action' => $this->getActionURL( $this->getContextTitle() ),
2576                                 'enctype' => 'multipart/form-data'
2577                         ]
2578                 ) );
2579
2580                 if ( is_callable( $formCallback ) ) {
2581                         wfWarn( 'The $formCallback parameter to ' . __METHOD__ . 'is deprecated' );
2582                         call_user_func_array( $formCallback, [ &$wgOut ] );
2583                 }
2584
2585                 // Add an empty field to trip up spambots
2586                 $wgOut->addHTML(
2587                         Xml::openElement( 'div', [ 'id' => 'antispam-container', 'style' => 'display: none;' ] )
2588                         . Html::rawElement(
2589                                 'label',
2590                                 [ 'for' => 'wpAntispam' ],
2591                                 wfMessage( 'simpleantispam-label' )->parse()
2592                         )
2593                         . Xml::element(
2594                                 'input',
2595                                 [
2596                                         'type' => 'text',
2597                                         'name' => 'wpAntispam',
2598                                         'id' => 'wpAntispam',
2599                                         'value' => ''
2600                                 ]
2601                         )
2602                         . Xml::closeElement( 'div' )
2603                 );
2604
2605                 Hooks::run( 'EditPage::showEditForm:fields', [ &$this, &$wgOut ] );
2606
2607                 // Put these up at the top to ensure they aren't lost on early form submission
2608                 $this->showFormBeforeText();
2609
2610                 if ( $this->wasDeletedSinceLastEdit() && 'save' == $this->formtype ) {
2611                         $username = $this->lastDelete->user_name;
2612                         $comment = $this->lastDelete->log_comment;
2613
2614                         // It is better to not parse the comment at all than to have templates expanded in the middle
2615                         // TODO: can the checkLabel be moved outside of the div so that wrapWikiMsg could be used?
2616                         $key = $comment === ''
2617                                 ? 'confirmrecreate-noreason'
2618                                 : 'confirmrecreate';
2619                         $wgOut->addHTML(
2620                                 '<div class="mw-confirm-recreate">' .
2621                                         wfMessage( $key, $username, "<nowiki>$comment</nowiki>" )->parse() .
2622                                 Xml::checkLabel( wfMessage( 'recreate' )->text(), 'wpRecreate', 'wpRecreate', false,
2623                                         [ 'title' => Linker::titleAttrib( 'recreate' ), 'tabindex' => 1, 'id' => 'wpRecreate' ]
2624                                 ) .
2625                                 '</div>'
2626                         );
2627                 }
2628
2629                 # When the summary is hidden, also hide them on preview/show changes
2630                 if ( $this->nosummary ) {
2631                         $wgOut->addHTML( Html::hidden( 'nosummary', true ) );
2632                 }
2633
2634                 # If a blank edit summary was previously provided, and the appropriate
2635                 # user preference is active, pass a hidden tag as wpIgnoreBlankSummary. This will stop the
2636                 # user being bounced back more than once in the event that a summary
2637                 # is not required.
2638                 # ####
2639                 # For a bit more sophisticated detection of blank summaries, hash the
2640                 # automatic one and pass that in the hidden field wpAutoSummary.
2641                 if ( $this->missingSummary || ( $this->section == 'new' && $this->nosummary ) ) {
2642                         $wgOut->addHTML( Html::hidden( 'wpIgnoreBlankSummary', true ) );
2643                 }
2644
2645                 if ( $this->undidRev ) {
2646                         $wgOut->addHTML( Html::hidden( 'wpUndidRevision', $this->undidRev ) );
2647                 }
2648
2649                 if ( $this->selfRedirect ) {
2650                         $wgOut->addHTML( Html::hidden( 'wpIgnoreSelfRedirect', true ) );
2651                 }
2652
2653                 if ( $this->hasPresetSummary ) {
2654                         // If a summary has been preset using &summary= we don't want to prompt for
2655                         // a different summary. Only prompt for a summary if the summary is blanked.
2656                         // (Bug 17416)
2657                         $this->autoSumm = md5( '' );
2658                 }
2659
2660                 $autosumm = $this->autoSumm ? $this->autoSumm : md5( $this->summary );
2661                 $wgOut->addHTML( Html::hidden( 'wpAutoSummary', $autosumm ) );
2662
2663                 $wgOut->addHTML( Html::hidden( 'oldid', $this->oldid ) );
2664                 $wgOut->addHTML( Html::hidden( 'parentRevId', $this->getParentRevId() ) );
2665
2666                 $wgOut->addHTML( Html::hidden( 'format', $this->contentFormat ) );
2667                 $wgOut->addHTML( Html::hidden( 'model', $this->contentModel ) );
2668
2669                 if ( $this->section == 'new' ) {
2670                         $this->showSummaryInput( true, $this->summary );
2671                         $wgOut->addHTML( $this->getSummaryPreview( true, $this->summary ) );
2672                 }
2673
2674                 $wgOut->addHTML( $this->editFormTextBeforeContent );
2675
2676                 if ( !$this->isCssJsSubpage && $showToolbar && $wgUser->getOption( 'showtoolbar' ) ) {
2677                         $wgOut->addHTML( EditPage::getEditToolbar( $this->mTitle ) );
2678                 }
2679
2680                 if ( $this->blankArticle ) {
2681                         $wgOut->addHTML( Html::hidden( 'wpIgnoreBlankArticle', true ) );
2682                 }
2683
2684                 if ( $this->isConflict ) {
2685                         // In an edit conflict bypass the overridable content form method
2686                         // and fallback to the raw wpTextbox1 since editconflicts can't be
2687                         // resolved between page source edits and custom ui edits using the
2688                         // custom edit ui.
2689                         $this->textbox2 = $this->textbox1;
2690
2691                         $content = $this->getCurrentContent();
2692                         $this->textbox1 = $this->toEditText( $content );
2693
2694                         $this->showTextbox1();
2695                 } else {
2696                         $this->showContentForm();
2697                 }
2698
2699                 $wgOut->addHTML( $this->editFormTextAfterContent );
2700
2701                 $this->showStandardInputs();
2702
2703                 $this->showFormAfterText();
2704
2705                 $this->showTosSummary();
2706
2707                 $this->showEditTools();
2708
2709                 $wgOut->addHTML( $this->editFormTextAfterTools . "\n" );
2710
2711                 $wgOut->addHTML( Html::rawElement( 'div', [ 'class' => 'templatesUsed' ],
2712                         Linker::formatTemplates( $this->getTemplates(), $this->preview, $this->section != '' ) ) );
2713
2714                 $wgOut->addHTML( Html::rawElement( 'div', [ 'class' => 'hiddencats' ],
2715                         Linker::formatHiddenCategories( $this->page->getHiddenCategories() ) ) );
2716
2717                 if ( $this->mParserOutput ) {
2718                         $wgOut->setLimitReportData( $this->mParserOutput->getLimitReportData() );
2719                 }
2720
2721                 $wgOut->addModules( 'mediawiki.action.edit.collapsibleFooter' );
2722
2723                 if ( $this->isConflict ) {
2724                         try {
2725                                 $this->showConflict();
2726                         } catch ( MWContentSerializationException $ex ) {
2727                                 // this can't really happen, but be nice if it does.
2728                                 $msg = wfMessage(
2729                                         'content-failed-to-parse',
2730                                         $this->contentModel,
2731                                         $this->contentFormat,
2732                                         $ex->getMessage()
2733                                 );
2734                                 $wgOut->addWikiText( '<div class="error">' . $msg->text() . '</div>' );
2735                         }
2736                 }
2737
2738                 // Set a hidden field so JS knows what edit form mode we are in
2739                 if ( $this->isConflict ) {
2740                         $mode = 'conflict';
2741                 } elseif ( $this->preview ) {
2742                         $mode = 'preview';
2743                 } elseif ( $this->diff ) {
2744                         $mode = 'diff';
2745                 } else {
2746                         $mode = 'text';
2747                 }
2748                 $wgOut->addHTML( Html::hidden( 'mode', $mode, [ 'id' => 'mw-edit-mode' ] ) );
2749
2750                 // Marker for detecting truncated form data.  This must be the last
2751                 // parameter sent in order to be of use, so do not move me.
2752                 $wgOut->addHTML( Html::hidden( 'wpUltimateParam', true ) );
2753                 $wgOut->addHTML( $this->editFormTextBottom . "\n</form>\n" );
2754
2755                 if ( !$wgUser->getOption( 'previewontop' ) ) {
2756                         $this->displayPreviewArea( $previewOutput, false );
2757                 }
2758
2759         }
2760
2761         /**
2762          * Extract the section title from current section text, if any.
2763          *
2764          * @param string $text
2765          * @return string|bool String or false
2766          */
2767         public static function extractSectionTitle( $text ) {
2768                 preg_match( "/^(=+)(.+)\\1\\s*(\n|$)/i", $text, $matches );
2769                 if ( !empty( $matches[2] ) ) {
2770                         global $wgParser;
2771                         return $wgParser->stripSectionName( trim( $matches[2] ) );
2772                 } else {
2773                         return false;
2774                 }
2775         }
2776
2777         /**
2778          * @return bool
2779          */
2780         protected function showHeader() {
2781                 global $wgOut, $wgUser, $wgMaxArticleSize, $wgLang;
2782                 global $wgAllowUserCss, $wgAllowUserJs;
2783
2784                 if ( $this->mTitle->isTalkPage() ) {
2785                         $wgOut->addWikiMsg( 'talkpagetext' );
2786                 }
2787
2788                 // Add edit notices
2789                 $editNotices = $this->mTitle->getEditNotices( $this->oldid );
2790                 if ( count( $editNotices ) ) {
2791                         $wgOut->addHTML( implode( "\n", $editNotices ) );
2792                 } else {
2793                         $msg = wfMessage( 'editnotice-notext' );
2794                         if ( !$msg->isDisabled() ) {
2795                                 $wgOut->addHTML(
2796                                         '<div class="mw-editnotice-notext">'
2797                                         . $msg->parseAsBlock()
2798                                         . '</div>'
2799                                 );
2800                         }
2801                 }
2802
2803                 if ( $this->isConflict ) {
2804                         $wgOut->wrapWikiMsg( "<div class='mw-explainconflict'>\n$1\n</div>", 'explainconflict' );
2805                         $this->editRevId = $this->page->getLatest();
2806                 } else {
2807                         if ( $this->section != '' && !$this->isSectionEditSupported() ) {
2808                                 // We use $this->section to much before this and getVal('wgSection') directly in other places
2809                                 // at this point we can't reset $this->section to '' to fallback to non-section editing.
2810                                 // Someone is welcome to try refactoring though
2811                                 $wgOut->showErrorPage( 'sectioneditnotsupported-title', 'sectioneditnotsupported-text' );
2812                                 return false;
2813                         }
2814
2815                         if ( $this->section != '' && $this->section != 'new' ) {
2816                                 if ( !$this->summary && !$this->preview && !$this->diff ) {
2817                                         $sectionTitle = self::extractSectionTitle( $this->textbox1 ); // FIXME: use Content object
2818                                         if ( $sectionTitle !== false ) {
2819                                                 $this->summary = "/* $sectionTitle */ ";
2820                                         }
2821                                 }
2822                         }
2823
2824                         if ( $this->missingComment ) {
2825                                 $wgOut->wrapWikiMsg( "<div id='mw-missingcommenttext'>\n$1\n</div>", 'missingcommenttext' );
2826                         }
2827
2828                         if ( $this->missingSummary && $this->section != 'new' ) {
2829                                 $wgOut->wrapWikiMsg( "<div id='mw-missingsummary'>\n$1\n</div>", 'missingsummary' );
2830                         }
2831
2832                         if ( $this->missingSummary && $this->section == 'new' ) {
2833                                 $wgOut->wrapWikiMsg( "<div id='mw-missingcommentheader'>\n$1\n</div>", 'missingcommentheader' );
2834                         }
2835
2836                         if ( $this->blankArticle ) {
2837                                 $wgOut->wrapWikiMsg( "<div id='mw-blankarticle'>\n$1\n</div>", 'blankarticle' );
2838                         }
2839
2840                         if ( $this->selfRedirect ) {
2841                                 $wgOut->wrapWikiMsg( "<div id='mw-selfredirect'>\n$1\n</div>", 'selfredirect' );
2842                         }
2843
2844                         if ( $this->hookError !== '' ) {
2845                                 $wgOut->addWikiText( $this->hookError );
2846                         }
2847
2848                         if ( !$this->checkUnicodeCompliantBrowser() ) {
2849                                 $wgOut->addWikiMsg( 'nonunicodebrowser' );
2850                         }
2851
2852                         if ( $this->section != 'new' ) {
2853                                 $revision = $this->mArticle->getRevisionFetched();
2854                                 if ( $revision ) {
2855                                         // Let sysop know that this will make private content public if saved
2856
2857                                         if ( !$revision->userCan( Revision::DELETED_TEXT, $wgUser ) ) {
2858                                                 $wgOut->wrapWikiMsg(
2859                                                         "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
2860                                                         'rev-deleted-text-permission'
2861                                                 );
2862                                         } elseif ( $revision->isDeleted( Revision::DELETED_TEXT ) ) {
2863                                                 $wgOut->wrapWikiMsg(
2864                                                         "<div class='mw-warning plainlinks'>\n$1\n</div>\n",
2865                                                         'rev-deleted-text-view'
2866                                                 );
2867                                         }
2868
2869                                         if ( !$revision->isCurrent() ) {
2870                                                 $this->mArticle->setOldSubtitle( $revision->getId() );
2871                                                 $wgOut->addWikiMsg( 'editingold' );
2872                                         }
2873                                 } elseif ( $this->mTitle->exists() ) {
2874                                         // Something went wrong
2875
2876                                         $wgOut->wrapWikiMsg( "<div class='errorbox'>\n$1\n</div>\n",
2877                                                 [ 'missing-revision', $this->oldid ] );
2878                                 }
2879                         }
2880                 }
2881
2882                 if ( wfReadOnly() ) {
2883                         $wgOut->wrapWikiMsg(
2884                                 "<div id=\"mw-read-only-warning\">\n$1\n</div>",
2885                                 [ 'readonlywarning', wfReadOnlyReason() ]
2886                         );
2887                 } elseif ( $wgUser->isAnon() ) {
2888                         if ( $this->formtype != 'preview' ) {
2889                                 $wgOut->wrapWikiMsg(
2890                                         "<div id='mw-anon-edit-warning' class='warningbox'>\n$1\n</div>",
2891                                         [ 'anoneditwarning',
2892                                                 // Log-in link
2893                                                 SpecialPage::getTitleFor( 'Userlogin' )->getFullURL( [
2894                                                         'returnto' => $this->getTitle()->getPrefixedDBkey()
2895                                                 ] ),
2896                                                 // Sign-up link
2897                                                 SpecialPage::getTitleFor( 'CreateAccount' )->getFullURL( [
2898                                                         'returnto' => $this->getTitle()->getPrefixedDBkey()
2899                                                 ] )
2900                                         ]
2901                                 );
2902                         } else {
2903                                 $wgOut->wrapWikiMsg( "<div id=\"mw-anon-preview-warning\" class=\"warningbox\">\n$1</div>",
2904                                         'anonpreviewwarning'
2905                                 );
2906                         }
2907                 } else {
2908                         if ( $this->isCssJsSubpage ) {
2909                                 # Check the skin exists
2910                                 if ( $this->isWrongCaseCssJsPage ) {
2911                                         $wgOut->wrapWikiMsg(
2912                                                 "<div class='error' id='mw-userinvalidcssjstitle'>\n$1\n</div>",
2913                                                 [ 'userinvalidcssjstitle', $this->mTitle->getSkinFromCssJsSubpage() ]
2914                                         );
2915                                 }
2916                                 if ( $this->getTitle()->isSubpageOf( $wgUser->getUserPage() ) ) {
2917                                         $wgOut->wrapWikiMsg( '<div class="mw-usercssjspublic">$1</div>',
2918                                                 $this->isCssSubpage ? 'usercssispublic' : 'userjsispublic'
2919                                         );
2920                                         if ( $this->formtype !== 'preview' ) {
2921                                                 if ( $this->isCssSubpage && $wgAllowUserCss ) {
2922                                                         $wgOut->wrapWikiMsg(
2923                                                                 "<div id='mw-usercssyoucanpreview'>\n$1\n</div>",
2924                                                                 [ 'usercssyoucanpreview' ]
2925                                                         );
2926                                                 }
2927
2928                                                 if ( $this->isJsSubpage && $wgAllowUserJs ) {
2929                                                         $wgOut->wrapWikiMsg(
2930                                                                 "<div id='mw-userjsyoucanpreview'>\n$1\n</div>",
2931                                                                 [ 'userjsyoucanpreview' ]
2932                                                         );
2933                                                 }
2934                                         }
2935                                 }
2936                         }
2937                 }
2938
2939                 if ( $this->mTitle->isProtected( 'edit' ) &&
2940                         MWNamespace::getRestrictionLevels( $this->mTitle->getNamespace() ) !== [ '' ]
2941                 ) {
2942                         # Is the title semi-protected?
2943                         if ( $this->mTitle->isSemiProtected() ) {
2944                                 $noticeMsg = 'semiprotectedpagewarning';
2945                         } else {
2946                                 # Then it must be protected based on static groups (regular)
2947                                 $noticeMsg = 'protectedpagewarning';
2948                         }
2949                         LogEventsList::showLogExtract( $wgOut, 'protect', $this->mTitle, '',
2950                                 [ 'lim' => 1, 'msgKey' => [ $noticeMsg ] ] );
2951                 }
2952                 if ( $this->mTitle->isCascadeProtected() ) {
2953                         # Is this page under cascading protection from some source pages?
2954                         /** @var Title[] $cascadeSources */
2955                         list( $cascadeSources, /* $restrictions */ ) = $this->mTitle->getCascadeProtectionSources();
2956                         $notice = "<div class='mw-cascadeprotectedwarning'>\n$1\n";
2957                         $cascadeSourcesCount = count( $cascadeSources );
2958                         if ( $cascadeSourcesCount > 0 ) {
2959                                 # Explain, and list the titles responsible
2960                                 foreach ( $cascadeSources as $page ) {
2961                                         $notice .= '* [[:' . $page->getPrefixedText() . "]]\n";
2962                                 }
2963                         }
2964                         $notice .= '</div>';
2965                         $wgOut->wrapWikiMsg( $notice, [ 'cascadeprotectedwarning', $cascadeSourcesCount ] );
2966                 }
2967                 if ( !$this->mTitle->exists() && $this->mTitle->getRestrictions( 'create' ) ) {
2968                         LogEventsList::showLogExtract( $wgOut, 'protect', $this->mTitle, '',
2969                                 [ 'lim' => 1,
2970                                         'showIfEmpty' => false,
2971                                         'msgKey' => [ 'titleprotectedwarning' ],
2972                                         'wrap' => "<div class=\"mw-titleprotectedwarning\">\n$1</div>" ] );
2973                 }
2974
2975                 if ( $this->contentLength === false ) {
2976                         $this->contentLength = strlen( $this->textbox1 );
2977                 }
2978
2979                 if ( $this->tooBig || $this->contentLength > $wgMaxArticleSize * 1024 ) {
2980                         $wgOut->wrapWikiMsg( "<div class='error' id='mw-edit-longpageerror'>\n$1\n</div>",
2981                                 [
2982                                         'longpageerror',
2983                                         $wgLang->formatNum( round( $this->contentLength / 1024, 3 ) ),
2984                                         $wgLang->formatNum( $wgMaxArticleSize )
2985                                 ]
2986                         );
2987                 } else {
2988                         if ( !wfMessage( 'longpage-hint' )->isDisabled() ) {
2989                                 $wgOut->wrapWikiMsg( "<div id='mw-edit-longpage-hint'>\n$1\n</div>",
2990                                         [
2991                                                 'longpage-hint',
2992                                                 $wgLang->formatSize( strlen( $this->textbox1 ) ),
2993                                                 strlen( $this->textbox1 )
2994                                         ]
2995                                 );
2996                         }
2997                 }
2998                 # Add header copyright warning
2999                 $this->showHeaderCopyrightWarning();
3000
3001                 return true;
3002         }
3003
3004         /**
3005          * Standard summary input and label (wgSummary), abstracted so EditPage
3006          * subclasses may reorganize the form.
3007          * Note that you do not need to worry about the label's for=, it will be
3008          * inferred by the id given to the input. You can remove them both by
3009          * passing array( 'id' => false ) to $userInputAttrs.
3010          *
3011          * @param string $summary The value of the summary input
3012          * @param string $labelText The html to place inside the label
3013          * @param array $inputAttrs Array of attrs to use on the input
3014          * @param array $spanLabelAttrs Array of attrs to use on the span inside the label
3015          *
3016          * @return array An array in the format array( $label, $input )
3017          */
3018         function getSummaryInput( $summary = "", $labelText = null,
3019                 $inputAttrs = null, $spanLabelAttrs = null
3020         ) {
3021                 // Note: the maxlength is overridden in JS to 255 and to make it use UTF-8 bytes, not characters.
3022                 $inputAttrs = ( is_array( $inputAttrs ) ? $inputAttrs : [] ) + [
3023                         'id' => 'wpSummary',
3024                         'maxlength' => '200',
3025                         'tabindex' => '1',
3026                         'size' => 60,
3027                         'spellcheck' => 'true',
3028                 ] + Linker::tooltipAndAccesskeyAttribs( 'summary' );
3029
3030                 $spanLabelAttrs = ( is_array( $spanLabelAttrs ) ? $spanLabelAttrs : [] ) + [
3031                         'class' => $this->missingSummary ? 'mw-summarymissed' : 'mw-summary',
3032                         'id' => "wpSummaryLabel"
3033                 ];
3034
3035                 $label = null;
3036                 if ( $labelText ) {
3037                         $label = Xml::tags(
3038                                 'label',
3039                                 $inputAttrs['id'] ? [ 'for' => $inputAttrs['id'] ] : null,
3040                                 $labelText
3041                         );
3042                         $label = Xml::tags( 'span', $spanLabelAttrs, $label );
3043                 }
3044
3045                 $input = Html::input( 'wpSummary', $summary, 'text', $inputAttrs );
3046
3047                 return [ $label, $input ];
3048         }
3049
3050         /**
3051          * @param bool $isSubjectPreview True if this is the section subject/title
3052          *   up top, or false if this is the comment summary
3053          *   down below the textarea
3054          * @param string $summary The text of the summary to display
3055          */
3056         protected function showSummaryInput( $isSubjectPreview, $summary = "" ) {
3057                 global $wgOut;
3058                 # Add a class if 'missingsummary' is triggered to allow styling of the summary line
3059                 $summaryClass = $this->missingSummary ? 'mw-summarymissed' : 'mw-summary';
3060                 if ( $isSubjectPreview ) {
3061                         if ( $this->nosummary ) {
3062                                 return;
3063                         }
3064                 } else {
3065                         if ( !$this->mShowSummaryField ) {
3066                                 return;
3067                         }
3068                 }
3069                 $labelText = wfMessage( $isSubjectPreview ? 'subject' : 'summary' )->parse();
3070                 list( $label, $input ) = $this->getSummaryInput(
3071                         $summary,
3072                         $labelText,
3073                         [ 'class' => $summaryClass ],
3074                         []
3075                 );
3076                 $wgOut->addHTML( "{$label} {$input}" );
3077         }
3078
3079         /**
3080          * @param bool $isSubjectPreview True if this is the section subject/title
3081          *   up top, or false if this is the comment summary
3082          *   down below the textarea
3083          * @param string $summary The text of the summary to display
3084          * @return string
3085          */
3086         protected function getSummaryPreview( $isSubjectPreview, $summary = "" ) {
3087                 // avoid spaces in preview, gets always trimmed on save
3088                 $summary = trim( $summary );
3089                 if ( !$summary || ( !$this->preview && !$this->diff ) ) {
3090                         return "";
3091                 }
3092
3093                 global $wgParser;
3094
3095                 if ( $isSubjectPreview ) {
3096                         $summary = wfMessage( 'newsectionsummary' )->rawParams( $wgParser->stripSectionName( $summary ) )
3097                                 ->inContentLanguage()->text();
3098                 }
3099
3100                 $message = $isSubjectPreview ? 'subject-preview' : 'summary-preview';
3101
3102                 $summary = wfMessage( $message )->parse()
3103                         . Linker::commentBlock( $summary, $this->mTitle, $isSubjectPreview );
3104                 return Xml::tags( 'div', [ 'class' => 'mw-summary-preview' ], $summary );
3105         }
3106
3107         protected function showFormBeforeText() {
3108                 global $wgOut;
3109                 $section = htmlspecialchars( $this->section );
3110                 $wgOut->addHTML( <<<HTML
3111 <input type='hidden' value="{$section}" name="wpSection"/>
3112 <input type='hidden' value="{$this->starttime}" name="wpStarttime" />
3113 <input type='hidden' value="{$this->edittime}" name="wpEdittime" />
3114 <input type='hidden' value="{$this->editRevId}" name="editRevId" />
3115 <input type='hidden' value="{$this->scrolltop}" name="wpScrolltop" id="wpScrolltop" />
3116
3117 HTML
3118                 );
3119                 if ( !$this->checkUnicodeCompliantBrowser() ) {
3120                         $wgOut->addHTML( Html::hidden( 'safemode', '1' ) );
3121                 }
3122         }
3123
3124         protected function showFormAfterText() {
3125                 global $wgOut, $wgUser;
3126                 /**
3127                  * To make it harder for someone to slip a user a page
3128                  * which submits an edit form to the wiki without their
3129                  * knowledge, a random token is associated with the login
3130                  * session. If it's not passed back with the submission,
3131                  * we won't save the page, or render user JavaScript and
3132                  * CSS previews.
3133                  *
3134                  * For anon editors, who may not have a session, we just
3135                  * include the constant suffix to prevent editing from
3136                  * broken text-mangling proxies.
3137                  */
3138                 $wgOut->addHTML( "\n" . Html::hidden( "wpEditToken", $wgUser->getEditToken() ) . "\n" );
3139         }
3140
3141         /**
3142          * Subpage overridable method for printing the form for page content editing
3143          * By default this simply outputs wpTextbox1
3144          * Subclasses can override this to provide a custom UI for editing;
3145          * be it a form, or simply wpTextbox1 with a modified content that will be
3146          * reverse modified when extracted from the post data.
3147          * Note that this is basically the inverse for importContentFormData
3148          */
3149         protected function showContentForm() {
3150                 $this->showTextbox1();
3151         }
3152
3153         /**
3154          * Method to output wpTextbox1
3155          * The $textoverride method can be used by subclasses overriding showContentForm
3156          * to pass back to this method.
3157          *
3158          * @param array $customAttribs Array of html attributes to use in the textarea
3159          * @param string $textoverride Optional text to override $this->textarea1 with
3160          */
3161         protected function showTextbox1( $customAttribs = null, $textoverride = null ) {
3162                 if ( $this->wasDeletedSinceLastEdit() && $this->formtype == 'save' ) {
3163                         $attribs = [ 'style' => 'display:none;' ];
3164                 } else {
3165                         $classes = []; // Textarea CSS
3166                         if ( $this->mTitle->isProtected( 'edit' ) &&
3167                                 MWNamespace::getRestrictionLevels( $this->mTitle->getNamespace() ) !== [ '' ]
3168                         ) {
3169                                 # Is the title semi-protected?
3170                                 if ( $this->mTitle->isSemiProtected() ) {
3171                                         $classes[] = 'mw-textarea-sprotected';
3172                                 } else {
3173                                         # Then it must be protected based on static groups (regular)
3174                                         $classes[] = 'mw-textarea-protected';
3175                                 }
3176                                 # Is the title cascade-protected?
3177                                 if ( $this->mTitle->isCascadeProtected() ) {
3178                                         $classes[] = 'mw-textarea-cprotected';
3179                                 }
3180                         }
3181
3182                         $attribs = [ 'tabindex' => 1 ];
3183
3184                         if ( is_array( $customAttribs ) ) {
3185                                 $attribs += $customAttribs;
3186                         }
3187
3188                         if ( count( $classes ) ) {
3189                                 if ( isset( $attribs['class'] ) ) {
3190                                         $classes[] = $attribs['class'];
3191                                 }
3192                                 $attribs['class'] = implode( ' ', $classes );
3193                         }
3194                 }
3195
3196                 $this->showTextbox(
3197                         $textoverride !== null ? $textoverride : $this->textbox1,
3198                         'wpTextbox1',
3199                         $attribs
3200                 );
3201         }
3202
3203         protected function showTextbox2() {
3204                 $this->showTextbox( $this->textbox2, 'wpTextbox2', [ 'tabindex' => 6, 'readonly' ] );
3205         }
3206
3207         protected function showTextbox( $text, $name, $customAttribs = [] ) {
3208                 global $wgOut, $wgUser;
3209
3210                 $wikitext = $this->safeUnicodeOutput( $text );
3211                 if ( strval( $wikitext ) !== '' ) {
3212                         // Ensure there's a newline at the end, otherwise adding lines
3213                         // is awkward.
3214                         // But don't add a newline if the ext is empty, or Firefox in XHTML
3215                         // mode will show an extra newline. A bit annoying.
3216                         $wikitext .= "\n";
3217                 }
3218
3219                 $attribs = $customAttribs + [
3220                         'accesskey' => ',',
3221                         'id' => $name,
3222                         'cols' => $wgUser->getIntOption( 'cols' ),
3223                         'rows' => $wgUser->getIntOption( 'rows' ),
3224                         // Avoid PHP notices when appending preferences
3225                         // (appending allows customAttribs['style'] to still work).
3226                         'style' => ''
3227                 ];
3228
3229                 $pageLang = $this->mTitle->getPageLanguage();
3230                 $attribs['lang'] = $pageLang->getHtmlCode();
3231                 $attribs['dir'] = $pageLang->getDir();
3232
3233                 $wgOut->addHTML( Html::textarea( $name, $wikitext, $attribs ) );
3234         }
3235
3236         protected function displayPreviewArea( $previewOutput, $isOnTop = false ) {
3237                 global $wgOut;
3238                 $classes = [];
3239                 if ( $isOnTop ) {
3240                         $classes[] = 'ontop';
3241                 }
3242
3243                 $attribs = [ 'id' => 'wikiPreview', 'class' => implode( ' ', $classes ) ];
3244
3245                 if ( $this->formtype != 'preview' ) {
3246                         $attribs['style'] = 'display: none;';
3247                 }
3248
3249                 $wgOut->addHTML( Xml::openElement( 'div', $attribs ) );
3250
3251                 if ( $this->formtype == 'preview' ) {
3252                         $this->showPreview( $previewOutput );
3253                 } else {
3254                         // Empty content container for LivePreview
3255                         $pageViewLang = $this->mTitle->getPageViewLanguage();
3256                         $attribs = [ 'lang' => $pageViewLang->getHtmlCode(), 'dir' => $pageViewLang->getDir(),
3257                                 'class' => 'mw-content-' . $pageViewLang->getDir() ];
3258                         $wgOut->addHTML( Html::rawElement( 'div', $attribs ) );
3259                 }
3260
3261                 $wgOut->addHTML( '</div>' );
3262
3263                 if ( $this->formtype == 'diff' ) {
3264                         try {
3265                                 $this->showDiff();
3266                         } catch ( MWContentSerializationException $ex ) {
3267                                 $msg = wfMessage(
3268                                         'content-failed-to-parse',
3269                                         $this->contentModel,
3270                                         $this->contentFormat,
3271                                         $ex->getMessage()
3272                                 );
3273                                 $wgOut->addWikiText( '<div class="error">' . $msg->text() . '</div>' );
3274                         }
3275                 }
3276         }
3277
3278         /**
3279          * Append preview output to $wgOut.
3280          * Includes category rendering if this is a category page.
3281          *
3282          * @param string $text The HTML to be output for the preview.
3283          */
3284         protected function showPreview( $text ) {
3285                 global $wgOut;
3286                 if ( $this->mTitle->getNamespace() == NS_CATEGORY ) {
3287                         $this->mArticle->openShowCategory();
3288                 }
3289                 # This hook seems slightly odd here, but makes things more
3290                 # consistent for extensions.
3291                 Hooks::run( 'OutputPageBeforeHTML', [ &$wgOut, &$text ] );
3292                 $wgOut->addHTML( $text );
3293                 if ( $this->mTitle->getNamespace() == NS_CATEGORY ) {
3294                         $this->mArticle->closeShowCategory();
3295                 }
3296         }
3297
3298         /**
3299          * Get a diff between the current contents of the edit box and the
3300          * version of the page we're editing from.
3301          *
3302          * If this is a section edit, we'll replace the section as for final
3303          * save and then make a comparison.
3304          */
3305         function showDiff() {
3306                 global $wgUser, $wgContLang, $wgOut;
3307
3308                 $oldtitlemsg = 'currentrev';
3309                 # if message does not exist, show diff against the preloaded default
3310                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI && !$this->mTitle->exists() ) {
3311                         $oldtext = $this->mTitle->getDefaultMessageText();
3312                         if ( $oldtext !== false ) {
3313                                 $oldtitlemsg = 'defaultmessagetext';
3314                                 $oldContent = $this->toEditContent( $oldtext );
3315                         } else {
3316                                 $oldContent = null;
3317                         }
3318                 } else {
3319                         $oldContent = $this->getCurrentContent();
3320                 }
3321
3322                 $textboxContent = $this->toEditContent( $this->textbox1 );
3323                 if ( $this->editRevId !== null ) {
3324                         $newContent = $this->page->replaceSectionAtRev(
3325                                 $this->section, $textboxContent, $this->summary, $this->editRevId
3326                         );
3327                 } else {
3328                         $newContent = $this->page->replaceSectionContent(
3329                                 $this->section, $textboxContent, $this->summary, $this->edittime
3330                         );
3331                 }
3332
3333                 if ( $newContent ) {
3334                         ContentHandler::runLegacyHooks( 'EditPageGetDiffText', [ $this, &$newContent ] );
3335                         Hooks::run( 'EditPageGetDiffContent', [ $this, &$newContent ] );
3336
3337                         $popts = ParserOptions::newFromUserAndLang( $wgUser, $wgContLang );
3338                         $newContent = $newContent->preSaveTransform( $this->mTitle, $wgUser, $popts );
3339                 }
3340
3341                 if ( ( $oldContent && !$oldContent->isEmpty() ) || ( $newContent && !$newContent->isEmpty() ) ) {
3342                         $oldtitle = wfMessage( $oldtitlemsg )->parse();
3343                         $newtitle = wfMessage( 'yourtext' )->parse();
3344
3345                         if ( !$oldContent ) {
3346                                 $oldContent = $newContent->getContentHandler()->makeEmptyContent();
3347                         }
3348
3349                         if ( !$newContent ) {
3350                                 $newContent = $oldContent->getContentHandler()->makeEmptyContent();
3351                         }
3352
3353                         $de = $oldContent->getContentHandler()->createDifferenceEngine( $this->mArticle->getContext() );
3354                         $de->setContent( $oldContent, $newContent );
3355
3356                         $difftext = $de->getDiff( $oldtitle, $newtitle );
3357                         $de->showDiffStyle();
3358                 } else {
3359                         $difftext = '';
3360                 }
3361
3362                 $wgOut->addHTML( '<div id="wikiDiff">' . $difftext . '</div>' );
3363         }
3364
3365         /**
3366          * Show the header copyright warning.
3367          */
3368         protected function showHeaderCopyrightWarning() {
3369                 $msg = 'editpage-head-copy-warn';
3370                 if ( !wfMessage( $msg )->isDisabled() ) {
3371                         global $wgOut;
3372                         $wgOut->wrapWikiMsg( "<div class='editpage-head-copywarn'>\n$1\n</div>",
3373                                 'editpage-head-copy-warn' );
3374                 }
3375         }
3376
3377         /**
3378          * Give a chance for site and per-namespace customizations of
3379          * terms of service summary link that might exist separately
3380          * from the copyright notice.
3381          *
3382          * This will display between the save button and the edit tools,
3383          * so should remain short!
3384          */
3385         protected function showTosSummary() {
3386                 $msg = 'editpage-tos-summary';
3387                 Hooks::run( 'EditPageTosSummary', [ $this->mTitle, &$msg ] );
3388                 if ( !wfMessage( $msg )->isDisabled() ) {
3389                         global $wgOut;
3390                         $wgOut->addHTML( '<div class="mw-tos-summary">' );
3391                         $wgOut->addWikiMsg( $msg );
3392                         $wgOut->addHTML( '</div>' );
3393                 }
3394         }
3395
3396         protected function showEditTools() {
3397                 global $wgOut;
3398                 $wgOut->addHTML( '<div class="mw-editTools">' .
3399                         wfMessage( 'edittools' )->inContentLanguage()->parse() .
3400                         '</div>' );
3401         }
3402
3403         /**
3404          * Get the copyright warning
3405          *
3406          * Renamed to getCopyrightWarning(), old name kept around for backwards compatibility
3407          * @return string
3408          */
3409         protected function getCopywarn() {
3410                 return self::getCopyrightWarning( $this->mTitle );
3411         }
3412
3413         /**
3414          * Get the copyright warning, by default returns wikitext
3415          *
3416          * @param Title $title
3417          * @param string $format Output format, valid values are any function of a Message object
3418          * @return string
3419          */
3420         public static function getCopyrightWarning( $title, $format = 'plain' ) {
3421                 global $wgRightsText;
3422                 if ( $wgRightsText ) {
3423                         $copywarnMsg = [ 'copyrightwarning',
3424                                 '[[' . wfMessage( 'copyrightpage' )->inContentLanguage()->text() . ']]',
3425                                 $wgRightsText ];
3426                 } else {
3427                         $copywarnMsg = [ 'copyrightwarning2',
3428                                 '[[' . wfMessage( 'copyrightpage' )->inContentLanguage()->text() . ']]' ];
3429                 }
3430                 // Allow for site and per-namespace customization of contribution/copyright notice.
3431                 Hooks::run( 'EditPageCopyrightWarning', [ $title, &$copywarnMsg ] );
3432
3433                 return "<div id=\"editpage-copywarn\">\n" .
3434                         call_user_func_array( 'wfMessage', $copywarnMsg )->$format() . "\n</div>";
3435         }
3436
3437         /**
3438          * Get the Limit report for page previews
3439          *
3440          * @since 1.22
3441          * @param ParserOutput $output ParserOutput object from the parse
3442          * @return string HTML
3443          */
3444         public static function getPreviewLimitReport( $output ) {
3445                 if ( !$output || !$output->getLimitReportData() ) {
3446                         return '';
3447                 }
3448
3449                 return ResourceLoader::makeInlineScript(
3450                         ResourceLoader::makeConfigSetScript(
3451                                 [ 'wgPageParseReport' => $output->getLimitReportData() ],
3452                                 true
3453                         )
3454                 );
3455         }
3456
3457         protected function showStandardInputs( &$tabindex = 2 ) {
3458                 global $wgOut;
3459                 $wgOut->addHTML( "<div class='editOptions'>\n" );
3460
3461                 if ( $this->section != 'new' ) {
3462                         $this->showSummaryInput( false, $this->summary );
3463                         $wgOut->addHTML( $this->getSummaryPreview( false, $this->summary ) );
3464                 }
3465
3466                 $checkboxes = $this->getCheckboxes( $tabindex,
3467                         [ 'minor' => $this->minoredit, 'watch' => $this->watchthis ] );
3468                 $wgOut->addHTML( "<div class='editCheckboxes'>" . implode( $checkboxes, "\n" ) . "</div>\n" );
3469
3470                 // Show copyright warning.
3471                 $wgOut->addWikiText( $this->getCopywarn() );
3472                 $wgOut->addHTML( $this->editFormTextAfterWarn );
3473
3474                 $wgOut->addHTML( "<div class='editButtons'>\n" );
3475                 $wgOut->addHTML( implode( $this->getEditButtons( $tabindex ), "\n" ) . "\n" );
3476
3477                 $cancel = $this->getCancelLink();
3478                 if ( $cancel !== '' ) {
3479                         $cancel .= Html::element( 'span',
3480                                 [ 'class' => 'mw-editButtons-pipe-separator' ],
3481                                 wfMessage( 'pipe-separator' )->text() );
3482                 }
3483
3484                 $message = wfMessage( 'edithelppage' )->inContentLanguage()->text();
3485                 $edithelpurl = Skin::makeInternalOrExternalUrl( $message );
3486                 $attrs = [
3487                         'target' => 'helpwindow',
3488                         'href' => $edithelpurl,
3489                 ];
3490                 $edithelp = Html::linkButton( wfMessage( 'edithelp' )->text(),
3491                         $attrs, [ 'mw-ui-quiet' ] ) .
3492                         wfMessage( 'word-separator' )->escaped() .
3493                         wfMessage( 'newwindow' )->parse();
3494
3495                 $wgOut->addHTML( "      <span class='cancelLink'>{$cancel}</span>\n" );
3496                 $wgOut->addHTML( "      <span class='editHelp'>{$edithelp}</span>\n" );
3497                 $wgOut->addHTML( "</div><!-- editButtons -->\n" );
3498
3499                 Hooks::run( 'EditPage::showStandardInputs:options', [ $this, $wgOut, &$tabindex ] );
3500
3501                 $wgOut->addHTML( "</div><!-- editOptions -->\n" );
3502         }
3503
3504         /**
3505          * Show an edit conflict. textbox1 is already shown in showEditForm().
3506          * If you want to use another entry point to this function, be careful.
3507          */
3508         protected function showConflict() {
3509                 global $wgOut;
3510
3511                 if ( Hooks::run( 'EditPageBeforeConflictDiff', [ &$this, &$wgOut ] ) ) {
3512                         $stats = $wgOut->getContext()->getStats();
3513                         $stats->increment( 'edit.failures.conflict' );
3514                         // Only include 'standard' namespaces to avoid creating unknown numbers of statsd metrics
3515                         if (
3516                                 $this->mTitle->getNamespace() >= NS_MAIN &&
3517                                 $this->mTitle->getNamespace() <= NS_CATEGORY_TALK
3518                         ) {
3519                                 $stats->increment( 'edit.failures.conflict.byNamespaceId.' . $this->mTitle->getNamespace() );
3520                         }
3521
3522                         $wgOut->wrapWikiMsg( '<h2>$1</h2>', "yourdiff" );
3523
3524                         $content1 = $this->toEditContent( $this->textbox1 );
3525                         $content2 = $this->toEditContent( $this->textbox2 );
3526
3527                         $handler = ContentHandler::getForModelID( $this->contentModel );
3528                         $de = $handler->createDifferenceEngine( $this->mArticle->getContext() );
3529                         $de->setContent( $content2, $content1 );
3530                         $de->showDiff(
3531                                 wfMessage( 'yourtext' )->parse(),
3532                                 wfMessage( 'storedversion' )->text()
3533                         );
3534
3535                         $wgOut->wrapWikiMsg( '<h2>$1</h2>', "yourtext" );
3536                         $this->showTextbox2();
3537                 }
3538         }
3539
3540         /**
3541          * @return string
3542          */
3543         public function getCancelLink() {
3544                 $cancelParams = [];
3545                 if ( !$this->isConflict && $this->oldid > 0 ) {
3546                         $cancelParams['oldid'] = $this->oldid;
3547                 } elseif ( $this->getContextTitle()->isRedirect() ) {
3548                         $cancelParams['redirect'] = 'no';
3549                 }
3550                 $attrs = [ 'id' => 'mw-editform-cancel' ];
3551
3552                 return Linker::linkKnown(
3553                         $this->getContextTitle(),
3554                         wfMessage( 'cancel' )->parse(),
3555                         Html::buttonAttributes( $attrs, [ 'mw-ui-quiet' ] ),
3556                         $cancelParams
3557                 );
3558         }
3559
3560         /**
3561          * Returns the URL to use in the form's action attribute.
3562          * This is used by EditPage subclasses when simply customizing the action
3563          * variable in the constructor is not enough. This can be used when the
3564          * EditPage lives inside of a Special page rather than a custom page action.
3565          *
3566          * @param Title $title Title object for which is being edited (where we go to for &action= links)
3567          * @return string
3568          */
3569         protected function getActionURL( Title $title ) {
3570                 return $title->getLocalURL( [ 'action' => $this->action ] );
3571         }
3572
3573         /**
3574          * Check if a page was deleted while the user was editing it, before submit.
3575          * Note that we rely on the logging table, which hasn't been always there,
3576          * but that doesn't matter, because this only applies to brand new
3577          * deletes.
3578          * @return bool
3579          */
3580         protected function wasDeletedSinceLastEdit() {
3581                 if ( $this->deletedSinceEdit !== null ) {
3582                         return $this->deletedSinceEdit;
3583                 }
3584
3585                 $this->deletedSinceEdit = false;
3586
3587                 if ( !$this->mTitle->exists() && $this->mTitle->isDeletedQuick() ) {
3588                         $this->lastDelete = $this->getLastDelete();
3589                         if ( $this->lastDelete ) {
3590                                 $deleteTime = wfTimestamp( TS_MW, $this->lastDelete->log_timestamp );
3591                                 if ( $deleteTime > $this->starttime ) {
3592                                         $this->deletedSinceEdit = true;
3593                                 }
3594                         }
3595                 }
3596
3597                 return $this->deletedSinceEdit;
3598         }
3599
3600         /**
3601          * @return bool|stdClass
3602          */
3603         protected function getLastDelete() {
3604                 $dbr = wfGetDB( DB_SLAVE );
3605                 $data = $dbr->selectRow(
3606                         [ 'logging', 'user' ],
3607                         [
3608                                 'log_type',
3609                                 'log_action',
3610                                 'log_timestamp',
3611                                 'log_user',
3612                                 'log_namespace',
3613                                 'log_title',
3614                                 'log_comment',
3615                                 'log_params',
3616                                 'log_deleted',
3617                                 'user_name'
3618                         ], [
3619                                 'log_namespace' => $this->mTitle->getNamespace(),
3620                                 'log_title' => $this->mTitle->getDBkey(),
3621                                 'log_type' => 'delete',
3622                                 'log_action' => 'delete',
3623                                 'user_id=log_user'
3624                         ],
3625                         __METHOD__,
3626                         [ 'LIMIT' => 1, 'ORDER BY' => 'log_timestamp DESC' ]
3627                 );
3628                 // Quick paranoid permission checks...
3629                 if ( is_object( $data ) ) {
3630                         if ( $data->log_deleted & LogPage::DELETED_USER ) {
3631                                 $data->user_name = wfMessage( 'rev-deleted-user' )->escaped();
3632                         }
3633
3634                         if ( $data->log_deleted & LogPage::DELETED_COMMENT ) {
3635                                 $data->log_comment = wfMessage( 'rev-deleted-comment' )->escaped();
3636                         }
3637                 }
3638
3639                 return $data;
3640         }
3641
3642         /**
3643          * Get the rendered text for previewing.
3644          * @throws MWException
3645          * @return string
3646          */
3647         function getPreviewText() {
3648                 global $wgOut, $wgRawHtml, $wgLang;
3649                 global $wgAllowUserCss, $wgAllowUserJs;
3650
3651                 $stats = $wgOut->getContext()->getStats();
3652
3653                 if ( $wgRawHtml && !$this->mTokenOk ) {
3654                         // Could be an offsite preview attempt. This is very unsafe if
3655                         // HTML is enabled, as it could be an attack.
3656                         $parsedNote = '';
3657                         if ( $this->textbox1 !== '' ) {
3658                                 // Do not put big scary notice, if previewing the empty
3659                                 // string, which happens when you initially edit
3660                                 // a category page, due to automatic preview-on-open.
3661                                 $parsedNote = $wgOut->parse( "<div class='previewnote'>" .
3662                                         wfMessage( 'session_fail_preview_html' )->text() . "</div>", true, /* interface */true );
3663                         }
3664                         $stats->increment( 'edit.failures.session_loss' );
3665                         return $parsedNote;
3666                 }
3667
3668                 $note = '';
3669
3670                 try {
3671                         $content = $this->toEditContent( $this->textbox1 );
3672
3673                         $previewHTML = '';
3674                         if ( !Hooks::run(
3675                                 'AlternateEditPreview',
3676                                 [ $this, &$content, &$previewHTML, &$this->mParserOutput ] )
3677                         ) {
3678                                 return $previewHTML;
3679                         }
3680
3681                         # provide a anchor link to the editform
3682                         $continueEditing = '<span class="mw-continue-editing">' .
3683                                 '[[#' . self::EDITFORM_ID . '|' . $wgLang->getArrow() . ' ' .
3684                                 wfMessage( 'continue-editing' )->text() . ']]</span>';
3685                         if ( $this->mTriedSave && !$this->mTokenOk ) {
3686                                 if ( $this->mTokenOkExceptSuffix ) {
3687                                         $note = wfMessage( 'token_suffix_mismatch' )->plain();
3688                                         $stats->increment( 'edit.failures.bad_token' );
3689                                 } else {
3690                                         $note = wfMessage( 'session_fail_preview' )->plain();
3691                                         $stats->increment( 'edit.failures.session_loss' );
3692                                 }
3693                         } elseif ( $this->incompleteForm ) {
3694                                 $note = wfMessage( 'edit_form_incomplete' )->plain();
3695                                 if ( $this->mTriedSave ) {
3696                                         $stats->increment( 'edit.failures.incomplete_form' );
3697                                 }
3698                         } else {
3699                                 $note = wfMessage( 'previewnote' )->plain() . ' ' . $continueEditing;
3700                         }
3701
3702                         # don't parse non-wikitext pages, show message about preview
3703                         if ( $this->mTitle->isCssJsSubpage() || $this->mTitle->isCssOrJsPage() ) {
3704                                 if ( $this->mTitle->isCssJsSubpage() ) {
3705                                         $level = 'user';
3706                                 } elseif ( $this->mTitle->isCssOrJsPage() ) {
3707                                         $level = 'site';
3708                                 } else {
3709                                         $level = false;
3710                                 }
3711
3712                                 if ( $content->getModel() == CONTENT_MODEL_CSS ) {
3713                                         $format = 'css';
3714                                         if ( $level === 'user' && !$wgAllowUserCss ) {
3715                                                 $format = false;
3716                                         }
3717                                 } elseif ( $content->getModel() == CONTENT_MODEL_JAVASCRIPT ) {
3718                                         $format = 'js';
3719                                         if ( $level === 'user' && !$wgAllowUserJs ) {
3720                                                 $format = false;
3721                                         }
3722                                 } else {
3723                                         $format = false;
3724                                 }
3725
3726                                 # Used messages to make sure grep find them:
3727                                 # Messages: usercsspreview, userjspreview, sitecsspreview, sitejspreview
3728                                 if ( $level && $format ) {
3729                                         $note = "<div id='mw-{$level}{$format}preview'>" .
3730                                                 wfMessage( "{$level}{$format}preview" )->text() .
3731                                                 ' ' . $continueEditing . "</div>";
3732                                 }
3733                         }
3734
3735                         # If we're adding a comment, we need to show the
3736                         # summary as the headline
3737                         if ( $this->section === "new" && $this->summary !== "" ) {
3738                                 $content = $content->addSectionHeader( $this->summary );
3739                         }
3740
3741                         $hook_args = [ $this, &$content ];
3742                         ContentHandler::runLegacyHooks( 'EditPageGetPreviewText', $hook_args );
3743                         Hooks::run( 'EditPageGetPreviewContent', $hook_args );
3744
3745                         $parserResult = $this->doPreviewParse( $content );
3746                         $parserOutput = $parserResult['parserOutput'];
3747                         $previewHTML = $parserResult['html'];
3748                         $this->mParserOutput = $parserOutput;
3749                         $wgOut->addParserOutputMetadata( $parserOutput );
3750
3751                         if ( count( $parserOutput->getWarnings() ) ) {
3752                                 $note .= "\n\n" . implode( "\n\n", $parserOutput->getWarnings() );
3753                         }
3754
3755                 } catch ( MWContentSerializationException $ex ) {
3756                         $m = wfMessage(
3757                                 'content-failed-to-parse',
3758                                 $this->contentModel,
3759                                 $this->contentFormat,
3760                                 $ex->getMessage()
3761                         );
3762                         $note .= "\n\n" . $m->parse();
3763                         $previewHTML = '';
3764                 }
3765
3766                 if ( $this->isConflict ) {
3767                         $conflict = '<h2 id="mw-previewconflict">'
3768                                 . wfMessage( 'previewconflict' )->escaped() . "</h2>\n";
3769                 } else {
3770                         $conflict = '<hr />';
3771                 }
3772
3773                 $previewhead = "<div class='previewnote'>\n" .
3774                         '<h2 id="mw-previewheader">' . wfMessage( 'preview' )->escaped() . "</h2>" .
3775                         $wgOut->parse( $note, true, /* interface */true ) . $conflict . "</div>\n";
3776
3777                 $pageViewLang = $this->mTitle->getPageViewLanguage();
3778                 $attribs = [ 'lang' => $pageViewLang->getHtmlCode(), 'dir' => $pageViewLang->getDir(),
3779                         'class' => 'mw-content-' . $pageViewLang->getDir() ];
3780                 $previewHTML = Html::rawElement( 'div', $attribs, $previewHTML );
3781
3782                 return $previewhead . $previewHTML . $this->previewTextAfterContent;
3783         }
3784
3785         /**
3786          * Get parser options for a preview
3787          * @return ParserOptions
3788          */
3789         protected function getPreviewParserOptions() {
3790                 $parserOptions = $this->page->makeParserOptions( $this->mArticle->getContext() );
3791                 $parserOptions->setIsPreview( true );
3792                 $parserOptions->setIsSectionPreview( !is_null( $this->section ) && $this->section !== '' );
3793                 $parserOptions->enableLimitReport();
3794                 return $parserOptions;
3795         }
3796
3797         /**
3798          * Parse the page for a preview. Subclasses may override this class, in order
3799          * to parse with different options, or to otherwise modify the preview HTML.
3800          *
3801          * @param Content @content The page content
3802          * @return Associative array with keys:
3803          *   - parserOutput: The ParserOutput object
3804          *   - html: The HTML to be displayed
3805          */
3806         protected function doPreviewParse( Content $content ) {
3807                 global $wgUser;
3808                 $parserOptions = $this->getPreviewParserOptions();
3809                 $pstContent = $content->preSaveTransform( $this->mTitle, $wgUser, $parserOptions );
3810                 $scopedCallback = $parserOptions->setupFakeRevision(
3811                         $this->mTitle, $pstContent, $wgUser );
3812                 $parserOutput = $pstContent->getParserOutput( $this->mTitle, null, $parserOptions );
3813                 ScopedCallback::consume( $scopedCallback );
3814                 $parserOutput->setEditSectionTokens( false ); // no section edit links
3815                 return [
3816                         'parserOutput' => $parserOutput,
3817                         'html' => $parserOutput->getText() ];
3818         }
3819
3820         /**
3821          * @return array
3822          */
3823         function getTemplates() {
3824                 if ( $this->preview || $this->section != '' ) {
3825                         $templates = [];
3826                         if ( !isset( $this->mParserOutput ) ) {
3827                                 return $templates;
3828                         }
3829                         foreach ( $this->mParserOutput->getTemplates() as $ns => $template ) {
3830                                 foreach ( array_keys( $template ) as $dbk ) {
3831                                         $templates[] = Title::makeTitle( $ns, $dbk );
3832                                 }
3833                         }
3834                         return $templates;
3835                 } else {
3836                         return $this->mTitle->getTemplateLinksFrom();
3837                 }
3838         }
3839
3840         /**
3841          * Shows a bulletin board style toolbar for common editing functions.
3842          * It can be disabled in the user preferences.
3843          *
3844          * @param Title $title Title object for the page being edited (optional)
3845          * @return string
3846          */
3847         static function getEditToolbar( $title = null ) {
3848                 global $wgContLang, $wgOut;
3849                 global $wgEnableUploads, $wgForeignFileRepos;
3850
3851                 $imagesAvailable = $wgEnableUploads || count( $wgForeignFileRepos );
3852                 $showSignature = true;
3853                 if ( $title ) {
3854                         $showSignature = MWNamespace::wantSignatures( $title->getNamespace() );
3855                 }
3856
3857                 /**
3858                  * $toolarray is an array of arrays each of which includes the
3859                  * opening tag, the closing tag, optionally a sample text that is
3860                  * inserted between the two when no selection is highlighted
3861                  * and.  The tip text is shown when the user moves the mouse
3862                  * over the button.
3863                  *
3864                  * Images are defined in ResourceLoaderEditToolbarModule.
3865                  */
3866                 $toolarray = [
3867                         [
3868                                 'id'     => 'mw-editbutton-bold',
3869                                 'open'   => '\'\'\'',
3870                                 'close'  => '\'\'\'',
3871                                 'sample' => wfMessage( 'bold_sample' )->text(),
3872                                 'tip'    => wfMessage( 'bold_tip' )->text(),
3873                         ],
3874                         [
3875                                 'id'     => 'mw-editbutton-italic',
3876                                 'open'   => '\'\'',
3877                                 'close'  => '\'\'',
3878                                 'sample' => wfMessage( 'italic_sample' )->text(),
3879                                 'tip'    => wfMessage( 'italic_tip' )->text(),
3880                         ],
3881                         [
3882                                 'id'     => 'mw-editbutton-link',
3883                                 'open'   => '[[',
3884                                 'close'  => ']]',
3885                                 'sample' => wfMessage( 'link_sample' )->text(),
3886                                 'tip'    => wfMessage( 'link_tip' )->text(),
3887                         ],
3888                         [
3889                                 'id'     => 'mw-editbutton-extlink',
3890                                 'open'   => '[',
3891                                 'close'  => ']',
3892                                 'sample' => wfMessage( 'extlink_sample' )->text(),
3893                                 'tip'    => wfMessage( 'extlink_tip' )->text(),
3894                         ],
3895                         [
3896                                 'id'     => 'mw-editbutton-headline',
3897                                 'open'   => "\n== ",
3898                                 'close'  => " ==\n",
3899                                 'sample' => wfMessage( 'headline_sample' )->text(),
3900                                 'tip'    => wfMessage( 'headline_tip' )->text(),
3901                         ],
3902                         $imagesAvailable ? [
3903                                 'id'     => 'mw-editbutton-image',
3904                                 'open'   => '[[' . $wgContLang->getNsText( NS_FILE ) . ':',
3905                                 'close'  => ']]',
3906                                 'sample' => wfMessage( 'image_sample' )->text(),
3907                                 'tip'    => wfMessage( 'image_tip' )->text(),
3908                         ] : false,
3909                         $imagesAvailable ? [
3910                                 'id'     => 'mw-editbutton-media',
3911                                 'open'   => '[[' . $wgContLang->getNsText( NS_MEDIA ) . ':',
3912                                 'close'  => ']]',
3913                                 'sample' => wfMessage( 'media_sample' )->text(),
3914                                 'tip'    => wfMessage( 'media_tip' )->text(),
3915                         ] : false,
3916                         [
3917                                 'id'     => 'mw-editbutton-nowiki',
3918                                 'open'   => "<nowiki>",
3919                                 'close'  => "</nowiki>",
3920                                 'sample' => wfMessage( 'nowiki_sample' )->text(),
3921                                 'tip'    => wfMessage( 'nowiki_tip' )->text(),
3922                         ],
3923                         $showSignature ? [
3924                                 'id'     => 'mw-editbutton-signature',
3925                                 'open'   => wfMessage( 'sig-text', '~~~~' )->inContentLanguage()->text(),
3926                                 'close'  => '',
3927                                 'sample' => '',
3928                                 'tip'    => wfMessage( 'sig_tip' )->text(),
3929                         ] : false,
3930                         [
3931                                 'id'     => 'mw-editbutton-hr',
3932                                 'open'   => "\n----\n",
3933                                 'close'  => '',
3934                                 'sample' => '',
3935                                 'tip'    => wfMessage( 'hr_tip' )->text(),
3936                         ]
3937                 ];
3938
3939                 $script = 'mw.loader.using("mediawiki.toolbar", function () {';
3940                 foreach ( $toolarray as $tool ) {
3941                         if ( !$tool ) {
3942                                 continue;
3943                         }
3944
3945                         $params = [
3946                                 // Images are defined in ResourceLoaderEditToolbarModule
3947                                 false,
3948                                 // Note that we use the tip both for the ALT tag and the TITLE tag of the image.
3949                                 // Older browsers show a "speedtip" type message only for ALT.
3950                                 // Ideally these should be different, realistically they
3951                                 // probably don't need to be.
3952                                 $tool['tip'],
3953                                 $tool['open'],
3954                                 $tool['close'],
3955                                 $tool['sample'],
3956                                 $tool['id'],
3957                         ];
3958
3959                         $script .= Xml::encodeJsCall(
3960                                 'mw.toolbar.addButton',
3961                                 $params,
3962                                 ResourceLoader::inDebugMode()
3963                         );
3964                 }
3965
3966                 $script .= '});';
3967                 $wgOut->addScript( ResourceLoader::makeInlineScript( $script ) );
3968
3969                 $toolbar = '<div id="toolbar"></div>';
3970
3971                 Hooks::run( 'EditPageBeforeEditToolbar', [ &$toolbar ] );
3972
3973                 return $toolbar;
3974         }
3975
3976         /**
3977          * Returns an array of html code of the following checkboxes:
3978          * minor and watch
3979          *
3980          * @param int $tabindex Current tabindex
3981          * @param array $checked Array of checkbox => bool, where bool indicates the checked
3982          *                 status of the checkbox
3983          *
3984          * @return array
3985          */
3986         public function getCheckboxes( &$tabindex, $checked ) {
3987                 global $wgUser, $wgUseMediaWikiUIEverywhere;
3988
3989                 $checkboxes = [];
3990
3991                 // don't show the minor edit checkbox if it's a new page or section
3992                 if ( !$this->isNew ) {
3993                         $checkboxes['minor'] = '';
3994                         $minorLabel = wfMessage( 'minoredit' )->parse();
3995                         if ( $wgUser->isAllowed( 'minoredit' ) ) {
3996                                 $attribs = [
3997                                         'tabindex' => ++$tabindex,
3998                                         'accesskey' => wfMessage( 'accesskey-minoredit' )->text(),
3999                                         'id' => 'wpMinoredit',
4000                                 ];
4001                                 $minorEditHtml =
4002                                         Xml::check( 'wpMinoredit', $checked['minor'], $attribs ) .
4003                                         "&#160;<label for='wpMinoredit' id='mw-editpage-minoredit'" .
4004                                         Xml::expandAttributes( [ 'title' => Linker::titleAttrib( 'minoredit', 'withaccess' ) ] ) .
4005                                         ">{$minorLabel}</label>";
4006
4007                                 if ( $wgUseMediaWikiUIEverywhere ) {
4008                                         $checkboxes['minor'] = Html::openElement( 'div', [ 'class' => 'mw-ui-checkbox' ] ) .
4009                                                 $minorEditHtml .
4010                                         Html::closeElement( 'div' );
4011                                 } else {
4012                                         $checkboxes['minor'] = $minorEditHtml;
4013                                 }
4014                         }
4015                 }
4016
4017                 $watchLabel = wfMessage( 'watchthis' )->parse();
4018                 $checkboxes['watch'] = '';
4019                 if ( $wgUser->isLoggedIn() ) {
4020                         $attribs = [
4021                                 'tabindex' => ++$tabindex,
4022                                 'accesskey' => wfMessage( 'accesskey-watch' )->text(),
4023                                 'id' => 'wpWatchthis',
4024                         ];
4025                         $watchThisHtml =
4026                                 Xml::check( 'wpWatchthis', $checked['watch'], $attribs ) .
4027                                 "&#160;<label for='wpWatchthis' id='mw-editpage-watch'" .
4028                                 Xml::expandAttributes( [ 'title' => Linker::titleAttrib( 'watch', 'withaccess' ) ] ) .
4029                                 ">{$watchLabel}</label>";
4030                         if ( $wgUseMediaWikiUIEverywhere ) {
4031                                 $checkboxes['watch'] = Html::openElement( 'div', [ 'class' => 'mw-ui-checkbox' ] ) .
4032                                         $watchThisHtml .
4033                                         Html::closeElement( 'div' );
4034                         } else {
4035                                 $checkboxes['watch'] = $watchThisHtml;
4036                         }
4037                 }
4038                 Hooks::run( 'EditPageBeforeEditChecks', [ &$this, &$checkboxes, &$tabindex ] );
4039                 return $checkboxes;
4040         }
4041
4042         /**
4043          * Returns an array of html code of the following buttons:
4044          * save, diff, preview and live
4045          *
4046          * @param int $tabindex Current tabindex
4047          *
4048          * @return array
4049          */
4050         public function getEditButtons( &$tabindex ) {
4051                 $buttons = [];
4052
4053                 $buttonLabelKey = $this->isNew ? 'savearticle' : 'savechanges';
4054                 $buttonLabel = wfMessage( $buttonLabelKey )->text();
4055                 $attribs = [
4056                         'id' => 'wpSave',
4057                         'name' => 'wpSave',
4058                         'tabindex' => ++$tabindex,
4059                 ] + Linker::tooltipAndAccesskeyAttribs( 'save' );
4060                 $buttons['save'] = Html::submitButton( $buttonLabel, $attribs, [ 'mw-ui-constructive' ] );
4061
4062                 ++$tabindex; // use the same for preview and live preview
4063                 $attribs = [
4064                         'id' => 'wpPreview',
4065                         'name' => 'wpPreview',
4066                         'tabindex' => $tabindex,
4067                 ] + Linker::tooltipAndAccesskeyAttribs( 'preview' );
4068                 $buttons['preview'] = Html::submitButton( wfMessage( 'showpreview' )->text(),
4069                         $attribs );
4070                 $buttons['live'] = '';
4071
4072                 $attribs = [
4073                         'id' => 'wpDiff',
4074                         'name' => 'wpDiff',
4075                         'tabindex' => ++$tabindex,
4076                 ] + Linker::tooltipAndAccesskeyAttribs( 'diff' );
4077                 $buttons['diff'] = Html::submitButton( wfMessage( 'showdiff' )->text(),
4078                         $attribs );
4079
4080                 Hooks::run( 'EditPageBeforeEditButtons', [ &$this, &$buttons, &$tabindex ] );
4081                 return $buttons;
4082         }
4083
4084         /**
4085          * Creates a basic error page which informs the user that
4086          * they have attempted to edit a nonexistent section.
4087          */
4088         function noSuchSectionPage() {
4089                 global $wgOut;
4090
4091                 $wgOut->prepareErrorPage( wfMessage( 'nosuchsectiontitle' ) );
4092
4093                 $res = wfMessage( 'nosuchsectiontext', $this->section )->parseAsBlock();
4094                 Hooks::run( 'EditPageNoSuchSection', [ &$this, &$res ] );
4095                 $wgOut->addHTML( $res );
4096
4097                 $wgOut->returnToMain( false, $this->mTitle );
4098         }
4099
4100         /**
4101          * Show "your edit contains spam" page with your diff and text
4102          *
4103          * @param string|array|bool $match Text (or array of texts) which triggered one or more filters
4104          */
4105         public function spamPageWithContent( $match = false ) {
4106                 global $wgOut, $wgLang;
4107                 $this->textbox2 = $this->textbox1;
4108
4109                 if ( is_array( $match ) ) {
4110                         $match = $wgLang->listToText( $match );
4111                 }
4112                 $wgOut->prepareErrorPage( wfMessage( 'spamprotectiontitle' ) );
4113
4114                 $wgOut->addHTML( '<div id="spamprotected">' );
4115                 $wgOut->addWikiMsg( 'spamprotectiontext' );
4116                 if ( $match ) {
4117                         $wgOut->addWikiMsg( 'spamprotectionmatch', wfEscapeWikiText( $match ) );
4118                 }
4119                 $wgOut->addHTML( '</div>' );
4120
4121                 $wgOut->wrapWikiMsg( '<h2>$1</h2>', "yourdiff" );
4122                 $this->showDiff();
4123
4124                 $wgOut->wrapWikiMsg( '<h2>$1</h2>', "yourtext" );
4125                 $this->showTextbox2();
4126
4127                 $wgOut->addReturnTo( $this->getContextTitle(), [ 'action' => 'edit' ] );
4128         }
4129
4130         /**
4131          * Check if the browser is on a blacklist of user-agents known to
4132          * mangle UTF-8 data on form submission. Returns true if Unicode
4133          * should make it through, false if it's known to be a problem.
4134          * @return bool
4135          */
4136         private function checkUnicodeCompliantBrowser() {
4137                 global $wgBrowserBlackList, $wgRequest;
4138
4139                 $currentbrowser = $wgRequest->getHeader( 'User-Agent' );
4140                 if ( $currentbrowser === false ) {
4141                         // No User-Agent header sent? Trust it by default...
4142                         return true;
4143                 }
4144
4145                 foreach ( $wgBrowserBlackList as $browser ) {
4146                         if ( preg_match( $browser, $currentbrowser ) ) {
4147                                 return false;
4148                         }
4149                 }
4150                 return true;
4151         }
4152
4153         /**
4154          * Filter an input field through a Unicode de-armoring process if it
4155          * came from an old browser with known broken Unicode editing issues.
4156          *
4157          * @param WebRequest $request
4158          * @param string $field
4159          * @return string
4160          */
4161         protected function safeUnicodeInput( $request, $field ) {
4162                 $text = rtrim( $request->getText( $field ) );
4163                 return $request->getBool( 'safemode' )
4164                         ? $this->unmakeSafe( $text )
4165                         : $text;
4166         }
4167
4168         /**
4169          * Filter an output field through a Unicode armoring process if it is
4170          * going to an old browser with known broken Unicode editing issues.
4171          *
4172          * @param string $text
4173          * @return string
4174          */
4175         protected function safeUnicodeOutput( $text ) {
4176                 return $this->checkUnicodeCompliantBrowser()
4177                         ? $text
4178                         : $this->makesafe( $text );
4179         }
4180
4181         /**
4182          * A number of web browsers are known to corrupt non-ASCII characters
4183          * in a UTF-8 text editing environment. To protect against this,
4184          * detected browsers will be served an armored version of the text,
4185          * with non-ASCII chars converted to numeric HTML character references.
4186          *
4187          * Preexisting such character references will have a 0 added to them
4188          * to ensure that round-trips do not alter the original data.
4189          *
4190          * @param string $invalue
4191          * @return string
4192          */
4193         private function makeSafe( $invalue ) {
4194                 // Armor existing references for reversibility.
4195                 $invalue = strtr( $invalue, [ "&#x" => "&#x0" ] );
4196
4197                 $bytesleft = 0;
4198                 $result = "";
4199                 $working = 0;
4200                 $valueLength = strlen( $invalue );
4201                 for ( $i = 0; $i < $valueLength; $i++ ) {
4202                         $bytevalue = ord( $invalue[$i] );
4203                         if ( $bytevalue <= 0x7F ) { // 0xxx xxxx
4204                                 $result .= chr( $bytevalue );
4205                                 $bytesleft = 0;
4206                         } elseif ( $bytevalue <= 0xBF ) { // 10xx xxxx
4207                                 $working = $working << 6;
4208                                 $working += ( $bytevalue & 0x3F );
4209                                 $bytesleft--;
4210                                 if ( $bytesleft <= 0 ) {
4211                                         $result .= "&#x" . strtoupper( dechex( $working ) ) . ";";
4212                                 }
4213                         } elseif ( $bytevalue <= 0xDF ) { // 110x xxxx
4214                                 $working = $bytevalue & 0x1F;
4215                                 $bytesleft = 1;
4216                         } elseif ( $bytevalue <= 0xEF ) { // 1110 xxxx
4217                                 $working = $bytevalue & 0x0F;
4218                                 $bytesleft = 2;
4219                         } else { // 1111 0xxx
4220                                 $working = $bytevalue & 0x07;
4221                                 $bytesleft = 3;
4222                         }
4223                 }
4224                 return $result;
4225         }
4226
4227         /**
4228          * Reverse the previously applied transliteration of non-ASCII characters
4229          * back to UTF-8. Used to protect data from corruption by broken web browsers
4230          * as listed in $wgBrowserBlackList.
4231          *
4232          * @param string $invalue
4233          * @return string
4234          */
4235         private function unmakeSafe( $invalue ) {
4236                 $result = "";
4237                 $valueLength = strlen( $invalue );
4238                 for ( $i = 0; $i < $valueLength; $i++ ) {
4239                         if ( ( substr( $invalue, $i, 3 ) == "&#x" ) && ( $invalue[$i + 3] != '0' ) ) {
4240                                 $i += 3;
4241                                 $hexstring = "";
4242                                 do {
4243                                         $hexstring .= $invalue[$i];
4244                                         $i++;
4245                                 } while ( ctype_xdigit( $invalue[$i] ) && ( $i < strlen( $invalue ) ) );
4246
4247                                 // Do some sanity checks. These aren't needed for reversibility,
4248                                 // but should help keep the breakage down if the editor
4249                                 // breaks one of the entities whilst editing.
4250                                 if ( ( substr( $invalue, $i, 1 ) == ";" ) && ( strlen( $hexstring ) <= 6 ) ) {
4251                                         $codepoint = hexdec( $hexstring );
4252                                         $result .= UtfNormal\Utils::codepointToUtf8( $codepoint );
4253                                 } else {
4254                                         $result .= "&#x" . $hexstring . substr( $invalue, $i, 1 );
4255                                 }
4256                         } else {
4257                                 $result .= substr( $invalue, $i, 1 );
4258                         }
4259                 }
4260                 // reverse the transform that we made for reversibility reasons.
4261                 return strtr( $result, [ "&#x0" => "&#x" ] );
4262         }
4263 }