includes/EditPage.php

   1 <?php
   2 /**
   3  * Page edition user interface.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 /**
  24  * The edit page/HTML interface (split from Article)
  25  * The actual database and text munging is still in Article,
  26  * but it should get easier to call those from alternate
  27  * interfaces.
  28  *
  29  * EditPage cares about two distinct titles:
  30  * $this->mContextTitle is the page that forms submit to, links point to,
  31  * redirects go to, etc. $this->mTitle (as well as $mArticle) is the
  32  * page in the database that is actually being edited. These are
  33  * usually the same, but they are now allowed to be different.
  34  *
  35  * Surgeon General's Warning: prolonged exposure to this class is known to cause
  36  * headaches, which may be fatal.
  37  */
  38 class EditPage {
  39
  40         /**
  41          * Status: Article successfully updated
  42          */
  43         const AS_SUCCESS_UPDATE = 200;
  44
  45         /**
  46          * Status: Article successfully created
  47          */
  48         const AS_SUCCESS_NEW_ARTICLE = 201;
  49
  50         /**
  51          * Status: Article update aborted by a hook function
  52          */
  53         const AS_HOOK_ERROR = 210;
  54
  55         /**
  56          * Status: A hook function returned an error
  57          */
  58         const AS_HOOK_ERROR_EXPECTED = 212;
  59
  60         /**
  61          * Status: User is blocked from editing this page
  62          */
  63         const AS_BLOCKED_PAGE_FOR_USER = 215;
  64
  65         /**
  66          * Status: Content too big (> $wgMaxArticleSize)
  67          */
  68         const AS_CONTENT_TOO_BIG = 216;
  69
  70         /**
  71          * Status: User cannot edit? (not used)
  72          */
  73         const AS_USER_CANNOT_EDIT = 217;
  74
  75         /**
  76          * Status: this anonymous user is not allowed to edit this page
  77          */
  78         const AS_READ_ONLY_PAGE_ANON = 218;
  79
  80         /**
  81          * Status: this logged in user is not allowed to edit this page
  82          */
  83         const AS_READ_ONLY_PAGE_LOGGED = 219;
  84
  85         /**
  86          * Status: wiki is in readonly mode (wfReadOnly() == true)
  87          */
  88         const AS_READ_ONLY_PAGE = 220;
  89
  90         /**
  91          * Status: rate limiter for action 'edit' was tripped
  92          */
  93         const AS_RATE_LIMITED = 221;
  94
  95         /**
  96          * Status: article was deleted while editing and param wpRecreate == false or form
  97          * was not posted
  98          */
  99         const AS_ARTICLE_WAS_DELETED = 222;
 100
 101         /**
 102          * Status: user tried to create this page, but is not allowed to do that
 103          * ( Title->userCan('create') == false )
 104          */
 105         const AS_NO_CREATE_PERMISSION = 223;
 106
 107         /**
 108          * Status: user tried to create a blank page
 109          */
 110         const AS_BLANK_ARTICLE = 224;
 111
 112         /**
 113          * Status: (non-resolvable) edit conflict
 114          */
 115         const AS_CONFLICT_DETECTED = 225;
 116
 117         /**
 118          * Status: no edit summary given and the user has forceeditsummary set and the user is not
 119          * editing in his own userspace or talkspace and wpIgnoreBlankSummary == false
 120          */
 121         const AS_SUMMARY_NEEDED = 226;
 122
 123         /**
 124          * Status: user tried to create a new section without content
 125          */
 126         const AS_TEXTBOX_EMPTY = 228;
 127
 128         /**
 129          * Status: article is too big (> $wgMaxArticleSize), after merging in the new section
 130          */
 131         const AS_MAX_ARTICLE_SIZE_EXCEEDED = 229;
 132
 133         /**
 134          * not used
 135          */
 136         const AS_OK = 230;
 137
 138         /**
 139          * Status: WikiPage::doEdit() was unsuccessful
 140          */
 141         const AS_END = 231;
 142
 143         /**
 144          * Status: summary contained spam according to one of the regexes in $wgSummarySpamRegex
 145          */
 146         const AS_SPAM_ERROR = 232;
 147
 148         /**
 149          * Status: anonymous user is not allowed to upload (User::isAllowed('upload') == false)
 150          */
 151         const AS_IMAGE_REDIRECT_ANON = 233;
 152
 153         /**
 154          * Status: logged in user is not allowed to upload (User::isAllowed('upload') == false)
 155          */
 156         const AS_IMAGE_REDIRECT_LOGGED = 234;
 157
 158         /**
 159          * Status: can't parse content
 160          */
 161         const AS_PARSE_ERROR = 240;
 162
 163         /**
 164          * HTML id and name for the beginning of the edit form.
 165          */
 166         const EDITFORM_ID = 'editform';
 167
 168         /**
 169          * Prefix of key for cookie used to pass post-edit state.
 170          * The revision id edited is added after this
 171          */
 172         const POST_EDIT_COOKIE_KEY_PREFIX = 'PostEditRevision';
 173
 174         /**
 175          * Duration of PostEdit cookie, in seconds.
 176          * The cookie will be removed instantly if the JavaScript runs.
 177          *
 178          * Otherwise, though, we don't want the cookies to accumulate.
 179          * RFC 2109 ( https://www.ietf.org/rfc/rfc2109.txt ) specifies a possible limit of only 20 cookies per domain.
 180          * This still applies at least to some versions of IE without full updates:
 181          * https://blogs.msdn.com/b/ieinternals/archive/2009/08/20/wininet-ie-cookie-internals-faq.aspx
 182          *
 183          * A value of 20 minutes should be enough to take into account slow loads and minor
 184          * clock skew while still avoiding cookie accumulation when JavaScript is turned off.
 185          */
 186         const POST_EDIT_COOKIE_DURATION = 1200;
 187
 188         /**
 189          * @var Article
 190          */
 191         var $mArticle;
 192
 193         /**
 194          * @var Title
 195          */
 196         var $mTitle;
 197         private $mContextTitle = null;
 198         var $action = 'submit';
 199         var $isConflict = false;
 200         var $isCssJsSubpage = false;
 201         var $isCssSubpage = false;
 202         var $isJsSubpage = false;
 203         var $isWrongCaseCssJsPage = false;
 204         var $isNew = false; // new page or new section
 205         var $deletedSinceEdit;
 206         var $formtype;
 207         var $firsttime;
 208         var $lastDelete;
 209         var $mTokenOk = false;
 210         var $mTokenOkExceptSuffix = false;
 211         var $mTriedSave = false;
 212         var $incompleteForm = false;
 213         var $tooBig = false;
 214         var $kblength = false;
 215         var $missingComment = false;
 216         var $missingSummary = false;
 217         var $allowBlankSummary = false;
 218         var $autoSumm = '';
 219         var $hookError = '';
 220         #var $mPreviewTemplates;
 221
 222         /**
 223          * @var ParserOutput
 224          */
 225         var $mParserOutput;
 226
 227         /**
 228          * Has a summary been preset using GET parameter &summary= ?
 229          * @var Bool
 230          */
 231         var $hasPresetSummary = false;
 232
 233         var $mBaseRevision = false;
 234         var $mShowSummaryField = true;
 235
 236         # Form values
 237         var $save = false, $preview = false, $diff = false;
 238         var $minoredit = false, $watchthis = false, $recreate = false;
 239         var $textbox1 = '', $textbox2 = '', $summary = '', $nosummary = false;
 240         var $edittime = '', $section = '', $sectiontitle = '', $starttime = '';
 241         var $oldid = 0, $editintro = '', $scrolltop = null, $bot = true;
 242         var $contentModel = null, $contentFormat = null;
 243
 244         # Placeholders for text injection by hooks (must be HTML)
 245         # extensions should take care to _append_ to the present value
 246         public $editFormPageTop = ''; // Before even the preview
 247         public $editFormTextTop = '';
 248         public $editFormTextBeforeContent = '';
 249         public $editFormTextAfterWarn = '';
 250         public $editFormTextAfterTools = '';
 251         public $editFormTextBottom = '';
 252         public $editFormTextAfterContent = '';
 253         public $previewTextAfterContent = '';
 254         public $mPreloadContent = null;
 255
 256         /* $didSave should be set to true whenever an article was successfully altered. */
 257         public $didSave = false;
 258         public $undidRev = 0;
 259
 260         public $suppressIntro = false;
 261
 262         /**
 263          * Set to true to allow editing of non-text content types.
 264          *
 265          * @var bool
 266          */
 267         public $allowNonTextContent = false;
 268
 269         /**
 270          * @param $article Article
 271          */
 272         public function __construct( Article $article ) {
 273                 $this->mArticle = $article;
 274                 $this->mTitle = $article->getTitle();
 275
 276                 $this->contentModel = $this->mTitle->getContentModel();
 277
 278                 $handler = ContentHandler::getForModelID( $this->contentModel );
 279                 $this->contentFormat = $handler->getDefaultFormat();
 280         }
 281
 282         /**
 283          * @return Article
 284          */
 285         public function getArticle() {
 286                 return $this->mArticle;
 287         }
 288
 289         /**
 290          * @since 1.19
 291          * @return Title
 292          */
 293         public function getTitle() {
 294                 return $this->mTitle;
 295         }
 296
 297         /**
 298          * Set the context Title object
 299          *
 300          * @param $title Title object or null
 301          */
 302         public function setContextTitle( $title ) {
 303                 $this->mContextTitle = $title;
 304         }
 305
 306         /**
 307          * Get the context title object.
 308          * If not set, $wgTitle will be returned. This behavior might change in
 309          * the future to return $this->mTitle instead.
 310          *
 311          * @return Title object
 312          */
 313         public function getContextTitle() {
 314                 if ( is_null( $this->mContextTitle ) ) {
 315                         global $wgTitle;
 316                         return $wgTitle;
 317                 } else {
 318                         return $this->mContextTitle;
 319                 }
 320         }
 321
 322         function submit() {
 323                 $this->edit();
 324         }
 325
 326         /**
 327          * This is the function that gets called for "action=edit". It
 328          * sets up various member variables, then passes execution to
 329          * another function, usually showEditForm()
 330          *
 331          * The edit form is self-submitting, so that when things like
 332          * preview and edit conflicts occur, we get the same form back
 333          * with the extra stuff added.  Only when the final submission
 334          * is made and all is well do we actually save and redirect to
 335          * the newly-edited page.
 336          */
 337         function edit() {
 338                 global $wgOut, $wgRequest, $wgUser;
 339                 // Allow extensions to modify/prevent this form or submission
 340                 if ( !wfRunHooks( 'AlternateEdit', array( $this ) ) ) {
 341                         return;
 342                 }
 343
 344                 wfProfileIn( __METHOD__ );
 345                 wfDebug( __METHOD__ . ": enter\n" );
 346
 347                 // If they used redlink=1 and the page exists, redirect to the main article
 348                 if ( $wgRequest->getBool( 'redlink' ) && $this->mTitle->exists() ) {
 349                         $wgOut->redirect( $this->mTitle->getFullURL() );
 350                         wfProfileOut( __METHOD__ );
 351                         return;
 352                 }
 353
 354                 $this->importFormData( $wgRequest );
 355                 $this->firsttime = false;
 356
 357                 if ( $this->live ) {
 358                         $this->livePreview();
 359                         wfProfileOut( __METHOD__ );
 360                         return;
 361                 }
 362
 363                 if ( wfReadOnly() && $this->save ) {
 364                         // Force preview
 365                         $this->save = false;
 366                         $this->preview = true;
 367                 }
 368
 369                 if ( $this->save ) {
 370                         $this->formtype = 'save';
 371                 } elseif ( $this->preview ) {
 372                         $this->formtype = 'preview';
 373                 } elseif ( $this->diff ) {
 374                         $this->formtype = 'diff';
 375                 } else { # First time through
 376                         $this->firsttime = true;
 377                         if ( $this->previewOnOpen() ) {
 378                                 $this->formtype = 'preview';
 379                         } else {
 380                                 $this->formtype = 'initial';
 381                         }
 382                 }
 383
 384                 $permErrors = $this->getEditPermissionErrors();
 385                 if ( $permErrors ) {
 386                         wfDebug( __METHOD__ . ": User can't edit\n" );
 387                         // Auto-block user's IP if the account was "hard" blocked
 388                         $wgUser->spreadAnyEditBlock();
 389
 390                         $this->displayPermissionsError( $permErrors );
 391
 392                         wfProfileOut( __METHOD__ );
 393                         return;
 394                 }
 395
 396                 wfProfileIn( __METHOD__ . "-business-end" );
 397
 398                 $this->isConflict = false;
 399                 // css / js subpages of user pages get a special treatment
 400                 $this->isCssJsSubpage = $this->mTitle->isCssJsSubpage();
 401                 $this->isCssSubpage = $this->mTitle->isCssSubpage();
 402                 $this->isJsSubpage = $this->mTitle->isJsSubpage();
 403                 $this->isWrongCaseCssJsPage = $this->isWrongCaseCssJsPage();
 404
 405                 # Show applicable editing introductions
 406                 if ( $this->formtype == 'initial' || $this->firsttime ) {
 407                         $this->showIntro();
 408                 }
 409
 410                 # Attempt submission here.  This will check for edit conflicts,
 411                 # and redundantly check for locked database, blocked IPs, etc.
 412                 # that edit() already checked just in case someone tries to sneak
 413                 # in the back door with a hand-edited submission URL.
 414
 415                 if ( 'save' == $this->formtype ) {
 416                         if ( !$this->attemptSave() ) {
 417                                 wfProfileOut( __METHOD__ . "-business-end" );
 418                                 wfProfileOut( __METHOD__ );
 419                                 return;
 420                         }
 421                 }
 422
 423                 # First time through: get contents, set time for conflict
 424                 # checking, etc.
 425                 if ( 'initial' == $this->formtype || $this->firsttime ) {
 426                         if ( $this->initialiseForm() === false ) {
 427                                 $this->noSuchSectionPage();
 428                                 wfProfileOut( __METHOD__ . "-business-end" );
 429                                 wfProfileOut( __METHOD__ );
 430                                 return;
 431                         }
 432
 433                         if ( !$this->mTitle->getArticleID() ) {
 434                                 wfRunHooks( 'EditFormPreloadText', array( &$this->textbox1, &$this->mTitle ) );
 435                         } else {
 436                                 wfRunHooks( 'EditFormInitialText', array( $this ) );
 437                         }
 438
 439                 }
 440
 441                 $this->showEditForm();
 442                 wfProfileOut( __METHOD__ . "-business-end" );
 443                 wfProfileOut( __METHOD__ );
 444         }
 445
 446         /**
 447          * @return array
 448          */
 449         protected function getEditPermissionErrors() {
 450                 global $wgUser;
 451                 $permErrors = $this->mTitle->getUserPermissionsErrors( 'edit', $wgUser );
 452                 # Can this title be created?
 453                 if ( !$this->mTitle->exists() ) {
 454                         $permErrors = array_merge( $permErrors,
 455                                 wfArrayDiff2( $this->mTitle->getUserPermissionsErrors( 'create', $wgUser ), $permErrors ) );
 456                 }
 457                 # Ignore some permissions errors when a user is just previewing/viewing diffs
 458                 $remove = array();
 459                 foreach ( $permErrors as $error ) {
 460                         if ( ( $this->preview || $this->diff ) &&
 461                                 ( $error[0] == 'blockedtext' || $error[0] == 'autoblockedtext' ) )
 462                         {
 463                                 $remove[] = $error;
 464                         }
 465                 }
 466                 $permErrors = wfArrayDiff2( $permErrors, $remove );
 467                 return $permErrors;
 468         }
 469
 470         /**
 471          * Display a permissions error page, like OutputPage::showPermissionsErrorPage(),
 472          * but with the following differences:
 473          * - If redlink=1, the user will be redirected to the page
 474          * - If there is content to display or the error occurs while either saving,
 475          *   previewing or showing the difference, it will be a
 476          *   "View source for ..." page displaying the source code after the error message.
 477          *
 478          * @since 1.19
 479          * @param array $permErrors of permissions errors, as returned by
 480          *                    Title::getUserPermissionsErrors().
 481          * @throws PermissionsError
 482          */
 483         protected function displayPermissionsError( array $permErrors ) {
 484                 global $wgRequest, $wgOut;
 485
 486                 if ( $wgRequest->getBool( 'redlink' ) ) {
 487                         // The edit page was reached via a red link.
 488                         // Redirect to the article page and let them click the edit tab if
 489                         // they really want a permission error.
 490                         $wgOut->redirect( $this->mTitle->getFullURL() );
 491                         return;
 492                 }
 493
 494                 $content = $this->getContentObject();
 495
 496                 # Use the normal message if there's nothing to display
 497                 if ( $this->firsttime && ( !$content || $content->isEmpty() ) ) {
 498                         $action = $this->mTitle->exists() ? 'edit' :
 499                                 ( $this->mTitle->isTalkPage() ? 'createtalk' : 'createpage' );
 500                         throw new PermissionsError( $action, $permErrors );
 501                 }
 502
 503                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
 504                 $wgOut->setPageTitle( wfMessage( 'viewsource-title', $this->getContextTitle()->getPrefixedText() ) );
 505                 $wgOut->addBacklinkSubtitle( $this->getContextTitle() );
 506                 $wgOut->addWikiText( $wgOut->formatPermissionsErrorMessage( $permErrors, 'edit' ) );
 507                 $wgOut->addHTML( "<hr />\n" );
 508
 509                 # If the user made changes, preserve them when showing the markup
 510                 # (This happens when a user is blocked during edit, for instance)
 511                 if ( !$this->firsttime ) {
 512                         $text = $this->textbox1;
 513                         $wgOut->addWikiMsg( 'viewyourtext' );
 514                 } else {
 515                         $text = $this->toEditText( $content );
 516                         $wgOut->addWikiMsg( 'viewsourcetext' );
 517                 }
 518
 519                 $this->showTextbox( $text, 'wpTextbox1', array( 'readonly' ) );
 520
 521                 $wgOut->addHTML( Html::rawElement( 'div', array( 'class' => 'templatesUsed' ),
 522                         Linker::formatTemplates( $this->getTemplates() ) ) );
 523
 524                 if ( $this->mTitle->exists() ) {
 525                         $wgOut->returnToMain( null, $this->mTitle );
 526                 }
 527         }
 528
 529         /**
 530          * Show a read-only error
 531          * Parameters are the same as OutputPage:readOnlyPage()
 532          * Redirect to the article page if redlink=1
 533          * @deprecated in 1.19; use displayPermissionsError() instead
 534          */
 535         function readOnlyPage( $source = null, $protected = false, $reasons = array(), $action = null ) {
 536                 wfDeprecated( __METHOD__, '1.19' );
 537
 538                 global $wgRequest, $wgOut;
 539                 if ( $wgRequest->getBool( 'redlink' ) ) {
 540                         // The edit page was reached via a red link.
 541                         // Redirect to the article page and let them click the edit tab if
 542                         // they really want a permission error.
 543                         $wgOut->redirect( $this->mTitle->getFullURL() );
 544                 } else {
 545                         $wgOut->readOnlyPage( $source, $protected, $reasons, $action );
 546                 }
 547         }
 548
 549         /**
 550          * Should we show a preview when the edit form is first shown?
 551          *
 552          * @return bool
 553          */
 554         protected function previewOnOpen() {
 555                 global $wgRequest, $wgUser, $wgPreviewOnOpenNamespaces;
 556                 if ( $wgRequest->getVal( 'preview' ) == 'yes' ) {
 557                         // Explicit override from request
 558                         return true;
 559                 } elseif ( $wgRequest->getVal( 'preview' ) == 'no' ) {
 560                         // Explicit override from request
 561                         return false;
 562                 } elseif ( $this->section == 'new' ) {
 563                         // Nothing *to* preview for new sections
 564                         return false;
 565                 } elseif ( ( $wgRequest->getVal( 'preload' ) !== null || $this->mTitle->exists() ) && $wgUser->getOption( 'previewonfirst' ) ) {
 566                         // Standard preference behavior
 567                         return true;
 568                 } elseif ( !$this->mTitle->exists() &&
 569                         isset( $wgPreviewOnOpenNamespaces[$this->mTitle->getNamespace()] ) &&
 570                         $wgPreviewOnOpenNamespaces[$this->mTitle->getNamespace()] )
 571                 {
 572                         // Categories are special
 573                         return true;
 574                 } else {
 575                         return false;
 576                 }
 577         }
 578
 579         /**
 580          * Checks whether the user entered a skin name in uppercase,
 581          * e.g. "User:Example/Monobook.css" instead of "monobook.css"
 582          *
 583          * @return bool
 584          */
 585         protected function isWrongCaseCssJsPage() {
 586                 if ( $this->mTitle->isCssJsSubpage() ) {
 587                         $name = $this->mTitle->getSkinFromCssJsSubpage();
 588                         $skins = array_merge(
 589                                 array_keys( Skin::getSkinNames() ),
 590                                 array( 'common' )
 591                         );
 592                         return !in_array( $name, $skins )
 593                                 && in_array( strtolower( $name ), $skins );
 594                 } else {
 595                         return false;
 596                 }
 597         }
 598
 599         /**
 600          * Returns whether section editing is supported for the current page.
 601          * Subclasses may override this to replace the default behavior, which is
 602          * to check ContentHandler::supportsSections.
 603          *
 604          * @return bool true if this edit page supports sections, false otherwise.
 605          */
 606         protected function isSectionEditSupported() {
 607                 $contentHandler = ContentHandler::getForTitle( $this->mTitle );
 608                 return $contentHandler->supportsSections();
 609         }
 610
 611         /**
 612          * This function collects the form data and uses it to populate various member variables.
 613          * @param $request WebRequest
 614          */
 615         function importFormData( &$request ) {
 616                 global $wgContLang, $wgUser;
 617
 618                 wfProfileIn( __METHOD__ );
 619
 620                 # Section edit can come from either the form or a link
 621                 $this->section = $request->getVal( 'wpSection', $request->getVal( 'section' ) );
 622
 623                 if ( $this->section !== null && $this->section !== '' && !$this->isSectionEditSupported() ) {
 624                         wfProfileOut( __METHOD__ );
 625                         throw new ErrorPageError( 'sectioneditnotsupported-title', 'sectioneditnotsupported-text' );
 626                 }
 627
 628                 $this->isNew = !$this->mTitle->exists() || $this->section == 'new';
 629
 630                 if ( $request->wasPosted() ) {
 631                         # These fields need to be checked for encoding.
 632                         # Also remove trailing whitespace, but don't remove _initial_
 633                         # whitespace from the text boxes. This may be significant formatting.
 634                         $this->textbox1 = $this->safeUnicodeInput( $request, 'wpTextbox1' );
 635                         if ( !$request->getCheck( 'wpTextbox2' ) ) {
 636                                 // Skip this if wpTextbox2 has input, it indicates that we came
 637                                 // from a conflict page with raw page text, not a custom form
 638                                 // modified by subclasses
 639                                 wfProfileIn( get_class( $this ) . "::importContentFormData" );
 640                                 $textbox1 = $this->importContentFormData( $request );
 641                                 if ( $textbox1 !== null ) {
 642                                         $this->textbox1 = $textbox1;
 643                                 }
 644
 645                                 wfProfileOut( get_class( $this ) . "::importContentFormData" );
 646                         }
 647
 648                         # Truncate for whole multibyte characters
 649                         $this->summary = $wgContLang->truncate( $request->getText( 'wpSummary' ), 255 );
 650
 651                         # If the summary consists of a heading, e.g. '==Foobar==', extract the title from the
 652                         # header syntax, e.g. 'Foobar'. This is mainly an issue when we are using wpSummary for
 653                         # section titles.
 654                         $this->summary = preg_replace( '/^\s*=+\s*(.*?)\s*=+\s*$/', '$1', $this->summary );
 655
 656                         # Treat sectiontitle the same way as summary.
 657                         # Note that wpSectionTitle is not yet a part of the actual edit form, as wpSummary is
 658                         # currently doing double duty as both edit summary and section title. Right now this
 659                         # is just to allow API edits to work around this limitation, but this should be
 660                         # incorporated into the actual edit form when EditPage is rewritten (Bugs 18654, 26312).
 661                         $this->sectiontitle = $wgContLang->truncate( $request->getText( 'wpSectionTitle' ), 255 );
 662                         $this->sectiontitle = preg_replace( '/^\s*=+\s*(.*?)\s*=+\s*$/', '$1', $this->sectiontitle );
 663
 664                         $this->edittime = $request->getVal( 'wpEdittime' );
 665                         $this->starttime = $request->getVal( 'wpStarttime' );
 666
 667                         $this->scrolltop = $request->getIntOrNull( 'wpScrolltop' );
 668
 669                         if ( $this->textbox1 === '' && $request->getVal( 'wpTextbox1' ) === null ) {
 670                                 // wpTextbox1 field is missing, possibly due to being "too big"
 671                                 // according to some filter rules such as Suhosin's setting for
 672                                 // suhosin.request.max_value_length (d'oh)
 673                                 $this->incompleteForm = true;
 674                         } else {
 675                                 // edittime should be one of our last fields; if it's missing,
 676                                 // the submission probably broke somewhere in the middle.
 677                                 $this->incompleteForm = is_null( $this->edittime );
 678                         }
 679                         if ( $this->incompleteForm ) {
 680                                 # If the form is incomplete, force to preview.
 681                                 wfDebug( __METHOD__ . ": Form data appears to be incomplete\n" );
 682                                 wfDebug( "POST DATA: " . var_export( $_POST, true ) . "\n" );
 683                                 $this->preview = true;
 684                         } else {
 685                                 /* Fallback for live preview */
 686                                 $this->preview = $request->getCheck( 'wpPreview' ) || $request->getCheck( 'wpLivePreview' );
 687                                 $this->diff = $request->getCheck( 'wpDiff' );
 688
 689                                 // Remember whether a save was requested, so we can indicate
 690                                 // if we forced preview due to session failure.
 691                                 $this->mTriedSave = !$this->preview;
 692
 693                                 if ( $this->tokenOk( $request ) ) {
 694                                         # Some browsers will not report any submit button
 695                                         # if the user hits enter in the comment box.
 696                                         # The unmarked state will be assumed to be a save,
 697                                         # if the form seems otherwise complete.
 698                                         wfDebug( __METHOD__ . ": Passed token check.\n" );
 699                                 } elseif ( $this->diff ) {
 700                                         # Failed token check, but only requested "Show Changes".
 701                                         wfDebug( __METHOD__ . ": Failed token check; Show Changes requested.\n" );
 702                                 } else {
 703                                         # Page might be a hack attempt posted from
 704                                         # an external site. Preview instead of saving.
 705                                         wfDebug( __METHOD__ . ": Failed token check; forcing preview\n" );
 706                                         $this->preview = true;
 707                                 }
 708                         }
 709                         $this->save = !$this->preview && !$this->diff;
 710                         if ( !preg_match( '/^\d{14}$/', $this->edittime ) ) {
 711                                 $this->edittime = null;
 712                         }
 713
 714                         if ( !preg_match( '/^\d{14}$/', $this->starttime ) ) {
 715                                 $this->starttime = null;
 716                         }
 717
 718                         $this->recreate = $request->getCheck( 'wpRecreate' );
 719
 720                         $this->minoredit = $request->getCheck( 'wpMinoredit' );
 721                         $this->watchthis = $request->getCheck( 'wpWatchthis' );
 722
 723                         # Don't force edit summaries when a user is editing their own user or talk page
 724                         if ( ( $this->mTitle->mNamespace == NS_USER || $this->mTitle->mNamespace == NS_USER_TALK ) &&
 725                                 $this->mTitle->getText() == $wgUser->getName() )
 726                         {
 727                                 $this->allowBlankSummary = true;
 728                         } else {
 729                                 $this->allowBlankSummary = $request->getBool( 'wpIgnoreBlankSummary' ) || !$wgUser->getOption( 'forceeditsummary' );
 730                         }
 731
 732                         $this->autoSumm = $request->getText( 'wpAutoSummary' );
 733                 } else {
 734                         # Not a posted form? Start with nothing.
 735                         wfDebug( __METHOD__ . ": Not a posted form.\n" );
 736                         $this->textbox1 = '';
 737                         $this->summary = '';
 738                         $this->sectiontitle = '';
 739                         $this->edittime = '';
 740                         $this->starttime = wfTimestampNow();
 741                         $this->edit = false;
 742                         $this->preview = false;
 743                         $this->save = false;
 744                         $this->diff = false;
 745                         $this->minoredit = false;
 746                         $this->watchthis = $request->getBool( 'watchthis', false ); // Watch may be overridden by request parameters
 747                         $this->recreate = false;
 748
 749                         // When creating a new section, we can preload a section title by passing it as the
 750                         // preloadtitle parameter in the URL (Bug 13100)
 751                         if ( $this->section == 'new' && $request->getVal( 'preloadtitle' ) ) {
 752                                 $this->sectiontitle = $request->getVal( 'preloadtitle' );
 753                                 // Once wpSummary isn't being use for setting section titles, we should delete this.
 754                                 $this->summary = $request->getVal( 'preloadtitle' );
 755                         }
 756                         elseif ( $this->section != 'new' && $request->getVal( 'summary' ) ) {
 757                                 $this->summary = $request->getText( 'summary' );
 758                                 if ( $this->summary !== '' ) {
 759                                         $this->hasPresetSummary = true;
 760                                 }
 761                         }
 762
 763                         if ( $request->getVal( 'minor' ) ) {
 764                                 $this->minoredit = true;
 765                         }
 766                 }
 767
 768                 $this->oldid = $request->getInt( 'oldid' );
 769
 770                 $this->bot = $request->getBool( 'bot', true );
 771                 $this->nosummary = $request->getBool( 'nosummary' );
 772
 773                 $content_handler = ContentHandler::getForTitle( $this->mTitle );
 774                 $this->contentModel = $request->getText( 'model', $content_handler->getModelID() ); #may be overridden by revision
 775                 $this->contentFormat = $request->getText( 'format', $content_handler->getDefaultFormat() ); #may be overridden by revision
 776
 777                 #TODO: check if the desired model is allowed in this namespace, and if a transition from the page's current model to the new model is allowed
 778                 #TODO: check if the desired content model supports the given content format!
 779
 780                 $this->live = $request->getCheck( 'live' );
 781                 $this->editintro = $request->getText( 'editintro',
 782                         // Custom edit intro for new sections
 783                         $this->section === 'new' ? 'MediaWiki:addsection-editintro' : '' );
 784
 785                 // Allow extensions to modify form data
 786                 wfRunHooks( 'EditPage::importFormData', array( $this, $request ) );
 787
 788                 wfProfileOut( __METHOD__ );
 789         }
 790
 791         /**
 792          * Subpage overridable method for extracting the page content data from the
 793          * posted form to be placed in $this->textbox1, if using customized input
 794          * this method should be overridden and return the page text that will be used
 795          * for saving, preview parsing and so on...
 796          *
 797          * @param $request WebRequest
 798          */
 799         protected function importContentFormData( &$request ) {
 800                 return; // Don't do anything, EditPage already extracted wpTextbox1
 801         }
 802
 803         /**
 804          * Initialise form fields in the object
 805          * Called on the first invocation, e.g. when a user clicks an edit link
 806          * @return bool -- if the requested section is valid
 807          */
 808         function initialiseForm() {
 809                 global $wgUser;
 810                 $this->edittime = $this->mArticle->getTimestamp();
 811
 812                 $content = $this->getContentObject( false ); #TODO: track content object?!
 813                 if ( $content === false ) {
 814                         return false;
 815                 }
 816                 $this->textbox1 = $this->toEditText( $content );
 817
 818                 // activate checkboxes if user wants them to be always active
 819                 # Sort out the "watch" checkbox
 820                 if ( $wgUser->getOption( 'watchdefault' ) ) {
 821                         # Watch all edits
 822                         $this->watchthis = true;
 823                 } elseif ( $wgUser->getOption( 'watchcreations' ) && !$this->mTitle->exists() ) {
 824                         # Watch creations
 825                         $this->watchthis = true;
 826                 } elseif ( $wgUser->isWatched( $this->mTitle ) ) {
 827                         # Already watched
 828                         $this->watchthis = true;
 829                 }
 830                 if ( $wgUser->getOption( 'minordefault' ) && !$this->isNew ) {
 831                         $this->minoredit = true;
 832                 }
 833                 if ( $this->textbox1 === false ) {
 834                         return false;
 835                 }
 836                 wfProxyCheck();
 837                 return true;
 838         }
 839
 840         /**
 841          * Fetch initial editing page content.
 842          *
 843          * @param $def_text string|bool
 844          * @return mixed string on success, $def_text for invalid sections
 845          * @private
 846          * @deprecated since 1.21, get WikiPage::getContent() instead.
 847          */
 848         function getContent( $def_text = false ) {
 849                 ContentHandler::deprecated( __METHOD__, '1.21' );
 850
 851                 if ( $def_text !== null && $def_text !== false && $def_text !== '' ) {
 852                         $def_content = $this->toEditContent( $def_text );
 853                 } else {
 854                         $def_content = false;
 855                 }
 856
 857                 $content = $this->getContentObject( $def_content );
 858
 859                 // Note: EditPage should only be used with text based content anyway.
 860                 return $this->toEditText( $content );
 861         }
 862
 863         /**
 864          * @param Content|null $def_content The default value to return
 865          *
 866          * @return mixed Content on success, $def_content for invalid sections
 867          *
 868          * @since 1.21
 869          */
 870         protected function getContentObject( $def_content = null ) {
 871                 global $wgOut, $wgRequest;
 872
 873                 wfProfileIn( __METHOD__ );
 874
 875                 $content = false;
 876
 877                 // For message page not locally set, use the i18n message.
 878                 // For other non-existent articles, use preload text if any.
 879                 if ( !$this->mTitle->exists() || $this->section == 'new' ) {
 880                         if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI && $this->section != 'new' ) {
 881                                 # If this is a system message, get the default text.
 882                                 $msg = $this->mTitle->getDefaultMessageText();
 883
 884                                 $content = $this->toEditContent( $msg );
 885                         }
 886                         if ( $content === false ) {
 887                                 # If requested, preload some text.
 888                                 $preload = $wgRequest->getVal( 'preload',
 889                                         // Custom preload text for new sections
 890                                         $this->section === 'new' ? 'MediaWiki:addsection-preload' : '' );
 891
 892                                 $content = $this->getPreloadedContent( $preload );
 893                         }
 894                 // For existing pages, get text based on "undo" or section parameters.
 895                 } else {
 896                         if ( $this->section != '' ) {
 897                                 // Get section edit text (returns $def_text for invalid sections)
 898                                 $orig = $this->getOriginalContent();
 899                                 $content = $orig ? $orig->getSection( $this->section ) : null;
 900
 901                                 if ( !$content ) {
 902                                         $content = $def_content;
 903                                 }
 904                         } else {
 905                                 $undoafter = $wgRequest->getInt( 'undoafter' );
 906                                 $undo = $wgRequest->getInt( 'undo' );
 907
 908                                 if ( $undo > 0 && $undoafter > 0 ) {
 909                                         if ( $undo < $undoafter ) {
 910                                                 # If they got undoafter and undo round the wrong way, switch them
 911                                                 list( $undo, $undoafter ) = array( $undoafter, $undo );
 912                                         }
 913
 914                                         $undorev = Revision::newFromId( $undo );
 915                                         $oldrev = Revision::newFromId( $undoafter );
 916
 917                                         # Sanity check, make sure it's the right page,
 918                                         # the revisions exist and they were not deleted.
 919                                         # Otherwise, $content will be left as-is.
 920                                         if ( !is_null( $undorev ) && !is_null( $oldrev ) &&
 921                                                 $undorev->getPage() == $oldrev->getPage() &&
 922                                                 $undorev->getPage() == $this->mTitle->getArticleID() &&
 923                                                 !$undorev->isDeleted( Revision::DELETED_TEXT ) &&
 924                                                 !$oldrev->isDeleted( Revision::DELETED_TEXT ) ) {
 925
 926                                                 $content = $this->mArticle->getUndoContent( $undorev, $oldrev );
 927
 928                                                 if ( $content === false ) {
 929                                                         # Warn the user that something went wrong
 930                                                         $undoMsg = 'failure';
 931                                                 } else {
 932                                                         # Inform the user of our success and set an automatic edit summary
 933                                                         $undoMsg = 'success';
 934
 935                                                         # If we just undid one rev, use an autosummary
 936                                                         $firstrev = $oldrev->getNext();
 937                                                         if ( $firstrev && $firstrev->getId() == $undo ) {
 938                                                                 $undoSummary = wfMessage( 'undo-summary', $undo, $undorev->getUserText() )->inContentLanguage()->text();
 939                                                                 if ( $this->summary === '' ) {
 940                                                                         $this->summary = $undoSummary;
 941                                                                 } else {
 942                                                                         $this->summary = $undoSummary . wfMessage( 'colon-separator' )
 943                                                                                 ->inContentLanguage()->text() . $this->summary;
 944                                                                 }
 945                                                                 $this->undidRev = $undo;
 946                                                         }
 947                                                         $this->formtype = 'diff';
 948                                                 }
 949                                         } else {
 950                                                 // Failed basic sanity checks.
 951                                                 // Older revisions may have been removed since the link
 952                                                 // was created, or we may simply have got bogus input.
 953                                                 $undoMsg = 'norev';
 954                                         }
 955
 956                                         $class = ( $undoMsg == 'success' ? '' : 'error ' ) . "mw-undo-{$undoMsg}";
 957                                         $this->editFormPageTop .= $wgOut->parse( "<div class=\"{$class}\">" .
 958                                                 wfMessage( 'undo-' . $undoMsg )->plain() . '</div>', true, /* interface */true );
 959                                 }
 960
 961                                 if ( $content === false ) {
 962                                         $content = $this->getOriginalContent();
 963                                 }
 964                         }
 965                 }
 966
 967                 wfProfileOut( __METHOD__ );
 968                 return $content;
 969         }
 970
 971         /**
 972          * Get the content of the wanted revision, without section extraction.
 973          *
 974          * The result of this function can be used to compare user's input with
 975          * section replaced in its context (using WikiPage::replaceSection())
 976          * to the original text of the edit.
 977          *
 978          * This differs from Article::getContent() that when a missing revision is
 979          * encountered the result will be null and not the
 980          * 'missing-revision' message.
 981          *
 982          * @since 1.19
 983          * @return Content|null
 984          */
 985         private function getOriginalContent() {
 986                 if ( $this->section == 'new' ) {
 987                         return $this->getCurrentContent();
 988                 }
 989                 $revision = $this->mArticle->getRevisionFetched();
 990                 if ( $revision === null ) {
 991                         if ( !$this->contentModel ) {
 992                                 $this->contentModel = $this->getTitle()->getContentModel();
 993                         }
 994                         $handler = ContentHandler::getForModelID( $this->contentModel );
 995
 996                         return $handler->makeEmptyContent();
 997                 }
 998                 $content = $revision->getContent();
 999                 return $content;
1000         }
1001
1002         /**
1003          * Get the current content of the page. This is basically similar to
1004          * WikiPage::getContent( Revision::RAW ) except that when the page doesn't exist an empty
1005          * content object is returned instead of null.
1006          *
1007          * @since 1.21
1008          * @return Content
1009          */
1010         protected function getCurrentContent() {
1011                 $rev = $this->mArticle->getRevision();
1012                 $content = $rev ? $rev->getContent( Revision::RAW ) : null;
1013
1014                 if ( $content === false || $content === null ) {
1015                         if ( !$this->contentModel ) {
1016                                 $this->contentModel = $this->getTitle()->getContentModel();
1017                         }
1018                         $handler = ContentHandler::getForModelID( $this->contentModel );
1019
1020                         return $handler->makeEmptyContent();
1021                 } else {
1022                         # nasty side-effect, but needed for consistency
1023                         $this->contentModel = $rev->getContentModel();
1024                         $this->contentFormat = $rev->getContentFormat();
1025
1026                         return $content;
1027                 }
1028         }
1029
1030         /**
1031          * Use this method before edit() to preload some text into the edit box
1032          *
1033          * @param $text string
1034          * @deprecated since 1.21, use setPreloadedContent() instead.
1035          */
1036         public function setPreloadedText( $text ) {
1037                 ContentHandler::deprecated( __METHOD__, "1.21" );
1038
1039                 $content = $this->toEditContent( $text );
1040
1041                 $this->setPreloadedContent( $content );
1042         }
1043
1044         /**
1045          * Use this method before edit() to preload some content into the edit box
1046          *
1047          * @param $content Content
1048          *
1049          * @since 1.21
1050          */
1051         public function setPreloadedContent( Content $content ) {
1052                 $this->mPreloadContent = $content;
1053         }
1054
1055         /**
1056          * Get the contents to be preloaded into the box, either set by
1057          * an earlier setPreloadText() or by loading the given page.
1058          *
1059          * @param string $preload representing the title to preload from.
1060          *
1061          * @return String
1062          *
1063          * @deprecated since 1.21, use getPreloadedContent() instead
1064          */
1065         protected function getPreloadedText( $preload ) {
1066                 ContentHandler::deprecated( __METHOD__, "1.21" );
1067
1068                 $content = $this->getPreloadedContent( $preload );
1069                 $text = $this->toEditText( $content );
1070
1071                 return $text;
1072         }
1073
1074         /**
1075          * Get the contents to be preloaded into the box, either set by
1076          * an earlier setPreloadText() or by loading the given page.
1077          *
1078          * @param string $preload representing the title to preload from.
1079          *
1080          * @return Content
1081          *
1082          * @since 1.21
1083          */
1084         protected function getPreloadedContent( $preload ) {
1085                 global $wgUser;
1086
1087                 if ( !empty( $this->mPreloadContent ) ) {
1088                         return $this->mPreloadContent;
1089                 }
1090
1091                 $handler = ContentHandler::getForTitle( $this->getTitle() );
1092
1093                 if ( $preload === '' ) {
1094                         return $handler->makeEmptyContent();
1095                 }
1096
1097                 $title = Title::newFromText( $preload );
1098                 # Check for existence to avoid getting MediaWiki:Noarticletext
1099                 if ( $title === null || !$title->exists() || !$title->userCan( 'read', $wgUser ) ) {
1100                         //TODO: somehow show a warning to the user!
1101                         return $handler->makeEmptyContent();
1102                 }
1103
1104                 $page = WikiPage::factory( $title );
1105                 if ( $page->isRedirect() ) {
1106                         $title = $page->getRedirectTarget();
1107                         # Same as before
1108                         if ( $title === null || !$title->exists() || !$title->userCan( 'read', $wgUser ) ) {
1109                                 //TODO: somehow show a warning to the user!
1110                                 return $handler->makeEmptyContent();
1111                         }
1112                         $page = WikiPage::factory( $title );
1113                 }
1114
1115                 $parserOptions = ParserOptions::newFromUser( $wgUser );
1116                 $content = $page->getContent( Revision::RAW );
1117
1118                 if ( !$content ) {
1119                         //TODO: somehow show a warning to the user!
1120                         return $handler->makeEmptyContent();
1121                 }
1122
1123                 if ( $content->getModel() !== $handler->getModelID() ) {
1124                         $converted = $content->convert( $handler->getModelID() );
1125
1126                         if ( !$converted ) {
1127                                 //TODO: somehow show a warning to the user!
1128                                 wfDebug( "Attempt to preload incompatible content: "
1129                                                 . "can't convert " . $content->getModel()
1130                                                 . " to " . $handler->getModelID() );
1131
1132                                 return $handler->makeEmptyContent();
1133                         }
1134
1135                         $content = $converted;
1136                 }
1137
1138                 return $content->preloadTransform( $title, $parserOptions );
1139         }
1140
1141         /**
1142          * Make sure the form isn't faking a user's credentials.
1143          *
1144          * @param $request WebRequest
1145          * @return bool
1146          * @private
1147          */
1148         function tokenOk( &$request ) {
1149                 global $wgUser;
1150                 $token = $request->getVal( 'wpEditToken' );
1151                 $this->mTokenOk = $wgUser->matchEditToken( $token );
1152                 $this->mTokenOkExceptSuffix = $wgUser->matchEditTokenNoSuffix( $token );
1153                 return $this->mTokenOk;
1154         }
1155
1156         /**
1157          * Sets post-edit cookie indicating the user just saved a particular revision.
1158          *
1159          * This uses a temporary cookie for each revision ID so separate saves will never
1160          * interfere with each other.
1161          *
1162          * The cookie is deleted in the mediawiki.action.view.postEdit JS module after
1163          * the redirect.  It must be clearable by JavaScript code, so it must not be
1164          * marked HttpOnly. The JavaScript code converts the cookie to a wgPostEdit config
1165          * variable.
1166          *
1167          * Since WebResponse::setcookie does not allow forcing HttpOnly for a single
1168          * cookie, we have to use PHP's setcookie() directly.
1169          *
1170          * We use a path of '/' since wgCookiePath is not exposed to JS
1171          *
1172          * If the variable were set on the server, it would be cached, which is unwanted
1173          * since the post-edit state should only apply to the load right after the save.
1174          */
1175         protected function setPostEditCookie() {
1176                 global $wgCookiePrefix, $wgCookieDomain;
1177                 $revisionId = $this->mArticle->getLatest();
1178                 $postEditKey = self::POST_EDIT_COOKIE_KEY_PREFIX . $revisionId;
1179
1180                 setcookie( $wgCookiePrefix . $postEditKey, '1', time() + self::POST_EDIT_COOKIE_DURATION, '/', $wgCookieDomain );
1181         }
1182
1183         /**
1184          * Attempt submission
1185          * @throws UserBlockedError|ReadOnlyError|ThrottledError|PermissionsError
1186          * @return bool false if output is done, true if the rest of the form should be displayed
1187          */
1188         function attemptSave() {
1189                 global $wgUser, $wgOut;
1190
1191                 $resultDetails = false;
1192                 # Allow bots to exempt some edits from bot flagging
1193                 $bot = $wgUser->isAllowed( 'bot' ) && $this->bot;
1194                 $status = $this->internalAttemptSave( $resultDetails, $bot );
1195                 // FIXME: once the interface for internalAttemptSave() is made nicer, this should use the message in $status
1196                 if ( $status->value == self::AS_SUCCESS_UPDATE || $status->value == self::AS_SUCCESS_NEW_ARTICLE ) {
1197                         $this->didSave = true;
1198                         if ( !$resultDetails['nullEdit'] ) {
1199                                 $this->setPostEditCookie();
1200                         }
1201                 }
1202
1203                 switch ( $status->value ) {
1204                         case self::AS_HOOK_ERROR_EXPECTED:
1205                         case self::AS_CONTENT_TOO_BIG:
1206                         case self::AS_ARTICLE_WAS_DELETED:
1207                         case self::AS_CONFLICT_DETECTED:
1208                         case self::AS_SUMMARY_NEEDED:
1209                         case self::AS_TEXTBOX_EMPTY:
1210                         case self::AS_MAX_ARTICLE_SIZE_EXCEEDED:
1211                         case self::AS_END:
1212                                 return true;
1213
1214                         case self::AS_HOOK_ERROR:
1215                                 return false;
1216
1217                         case self::AS_PARSE_ERROR:
1218                                 $wgOut->addWikiText( '<div class="error">' . $status->getWikiText() . '</div>' );
1219                                 return true;
1220
1221                         case self::AS_SUCCESS_NEW_ARTICLE:
1222                                 $query = $resultDetails['redirect'] ? 'redirect=no' : '';
1223                                 $anchor = isset( $resultDetails['sectionanchor'] ) ? $resultDetails['sectionanchor'] : '';
1224                                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $anchor );
1225                                 return false;
1226
1227                         case self::AS_SUCCESS_UPDATE:
1228                                 $extraQuery = '';
1229                                 $sectionanchor = $resultDetails['sectionanchor'];
1230
1231                                 // Give extensions a chance to modify URL query on update
1232                                 wfRunHooks( 'ArticleUpdateBeforeRedirect', array( $this->mArticle, &$sectionanchor, &$extraQuery ) );
1233
1234                                 if ( $resultDetails['redirect'] ) {
1235                                         if ( $extraQuery == '' ) {
1236                                                 $extraQuery = 'redirect=no';
1237                                         } else {
1238                                                 $extraQuery = 'redirect=no&' . $extraQuery;
1239                                         }
1240                                 }
1241                                 $wgOut->redirect( $this->mTitle->getFullURL( $extraQuery ) . $sectionanchor );
1242                                 return false;
1243
1244                         case self::AS_BLANK_ARTICLE:
1245                                 $wgOut->redirect( $this->getContextTitle()->getFullURL() );
1246                                 return false;
1247
1248                         case self::AS_SPAM_ERROR:
1249                                 $this->spamPageWithContent( $resultDetails['spam'] );
1250                                 return false;
1251
1252                         case self::AS_BLOCKED_PAGE_FOR_USER:
1253                                 throw new UserBlockedError( $wgUser->getBlock() );
1254
1255                         case self::AS_IMAGE_REDIRECT_ANON:
1256                         case self::AS_IMAGE_REDIRECT_LOGGED:
1257                                 throw new PermissionsError( 'upload' );
1258
1259                         case self::AS_READ_ONLY_PAGE_ANON:
1260                         case self::AS_READ_ONLY_PAGE_LOGGED:
1261                                 throw new PermissionsError( 'edit' );
1262
1263                         case self::AS_READ_ONLY_PAGE:
1264                                 throw new ReadOnlyError;
1265
1266                         case self::AS_RATE_LIMITED:
1267                                 throw new ThrottledError();
1268
1269                         case self::AS_NO_CREATE_PERMISSION:
1270                                 $permission = $this->mTitle->isTalkPage() ? 'createtalk' : 'createpage';
1271                                 throw new PermissionsError( $permission );
1272
1273                         default:
1274                                 // We don't recognize $status->value. The only way that can happen
1275                                 // is if an extension hook aborted from inside ArticleSave.
1276                                 // Render the status object into $this->hookError
1277                                 // FIXME this sucks, we should just use the Status object throughout
1278                                 $this->hookError = '<div class="error">' . $status->getWikitext() .
1279                                         '</div>';
1280                                 return true;
1281                 }
1282         }
1283
1284         /**
1285          * Run hooks that can filter edits just before they get saved.
1286          *
1287          * @param Content $content the Content to filter.
1288          * @param Status  $status for reporting the outcome to the caller
1289          * @param User    $user the user performing the edit
1290          *
1291          * @return bool
1292          */
1293         protected function runPostMergeFilters( Content $content, Status $status, User $user ) {
1294                 // Run old style post-section-merge edit filter
1295                 if ( !ContentHandler::runLegacyHooks( 'EditFilterMerged',
1296                         array( $this, $content, &$this->hookError, $this->summary ) ) ) {
1297
1298                         # Error messages etc. could be handled within the hook...
1299                         $status->fatal( 'hookaborted' );
1300                         $status->value = self::AS_HOOK_ERROR;
1301                         return false;
1302                 } elseif ( $this->hookError != '' ) {
1303                         # ...or the hook could be expecting us to produce an error
1304                         $status->fatal( 'hookaborted' );
1305                         $status->value = self::AS_HOOK_ERROR_EXPECTED;
1306                         return false;
1307                 }
1308
1309                 // Run new style post-section-merge edit filter
1310                 if ( !wfRunHooks( 'EditFilterMergedContent',
1311                         array( $this->mArticle->getContext(), $content, $status, $this->summary,
1312                                 $user, $this->minoredit ) ) ) {
1313
1314                         # Error messages etc. could be handled within the hook...
1315                         // XXX: $status->value may already be something informative...
1316                         $this->hookError = $status->getWikiText();
1317                         $status->fatal( 'hookaborted' );
1318                         $status->value = self::AS_HOOK_ERROR;
1319                         return false;
1320                 } elseif ( !$status->isOK() ) {
1321                         # ...or the hook could be expecting us to produce an error
1322                         // FIXME this sucks, we should just use the Status object throughout
1323                         $this->hookError = $status->getWikiText();
1324                         $status->fatal( 'hookaborted' );
1325                         $status->value = self::AS_HOOK_ERROR_EXPECTED;
1326                         return false;
1327                 }
1328
1329                 return true;
1330         }
1331
1332         /**
1333          * Attempt submission (no UI)
1334          *
1335          * @param array $result array to add statuses to, currently with the possible keys:
1336          *  spam - string - Spam string from content if any spam is detected by matchSpamRegex
1337          *  sectionanchor - string - Section anchor for a section save
1338          *  nullEdit - boolean - Set if doEditContent is OK.  True if null edit, false otherwise.
1339          *  redirect - boolean -  Set if doEditContent is OK.  True if resulting revision is a redirect
1340          * @param bool $bot True if edit is being made under the bot right.
1341          *
1342          * @return Status object, possibly with a message, but always with one of the AS_* constants in $status->value,
1343          *
1344          * FIXME: This interface is TERRIBLE, but hard to get rid of due to various error display idiosyncrasies. There are
1345          * also lots of cases where error metadata is set in the object and retrieved later instead of being returned, e.g.
1346          * AS_CONTENT_TOO_BIG and AS_BLOCKED_PAGE_FOR_USER. All that stuff needs to be cleaned up some time.
1347          */
1348         function internalAttemptSave( &$result, $bot = false ) {
1349                 global $wgUser, $wgRequest, $wgParser, $wgMaxArticleSize;
1350
1351                 $status = Status::newGood();
1352
1353                 wfProfileIn( __METHOD__ );
1354                 wfProfileIn( __METHOD__ . '-checks' );
1355
1356                 if ( !wfRunHooks( 'EditPage::attemptSave', array( $this ) ) ) {
1357                         wfDebug( "Hook 'EditPage::attemptSave' aborted article saving\n" );
1358                         $status->fatal( 'hookaborted' );
1359                         $status->value = self::AS_HOOK_ERROR;
1360                         wfProfileOut( __METHOD__ . '-checks' );
1361                         wfProfileOut( __METHOD__ );
1362                         return $status;
1363                 }
1364
1365                 try {
1366                         # Construct Content object
1367                         $textbox_content = $this->toEditContent( $this->textbox1 );
1368                 } catch ( MWContentSerializationException $ex ) {
1369                         $status->fatal( 'content-failed-to-parse', $this->contentModel, $this->contentFormat, $ex->getMessage() );
1370                         $status->value = self::AS_PARSE_ERROR;
1371                         wfProfileOut( __METHOD__ . '-checks' );
1372                         wfProfileOut( __METHOD__ );
1373                         return $status;
1374                 }
1375
1376                 # Check image redirect
1377                 if ( $this->mTitle->getNamespace() == NS_FILE &&
1378                         $textbox_content->isRedirect() &&
1379                         !$wgUser->isAllowed( 'upload' ) ) {
1380                                 $code = $wgUser->isAnon() ? self::AS_IMAGE_REDIRECT_ANON : self::AS_IMAGE_REDIRECT_LOGGED;
1381                                 $status->setResult( false, $code );
1382
1383                                 wfProfileOut( __METHOD__ . '-checks' );
1384                                 wfProfileOut( __METHOD__ );
1385
1386                                 return $status;
1387                 }
1388
1389                 # Check for spam
1390                 $match = self::matchSummarySpamRegex( $this->summary );
1391                 if ( $match === false ) {
1392                         $match = self::matchSpamRegex( $this->textbox1 );
1393                 }
1394                 if ( $match !== false ) {
1395                         $result['spam'] = $match;
1396                         $ip = $wgRequest->getIP();
1397                         $pdbk = $this->mTitle->getPrefixedDBkey();
1398                         $match = str_replace( "\n", '', $match );
1399                         wfDebugLog( 'SpamRegex', "$ip spam regex hit [[$pdbk]]: \"$match\"" );
1400                         $status->fatal( 'spamprotectionmatch', $match );
1401                         $status->value = self::AS_SPAM_ERROR;
1402                         wfProfileOut( __METHOD__ . '-checks' );
1403                         wfProfileOut( __METHOD__ );
1404                         return $status;
1405                 }
1406                 if ( !wfRunHooks( 'EditFilter', array( $this, $this->textbox1, $this->section, &$this->hookError, $this->summary ) ) ) {
1407                         # Error messages etc. could be handled within the hook...
1408                         $status->fatal( 'hookaborted' );
1409                         $status->value = self::AS_HOOK_ERROR;
1410                         wfProfileOut( __METHOD__ . '-checks' );
1411                         wfProfileOut( __METHOD__ );
1412                         return $status;
1413                 } elseif ( $this->hookError != '' ) {
1414                         # ...or the hook could be expecting us to produce an error
1415                         $status->fatal( 'hookaborted' );
1416                         $status->value = self::AS_HOOK_ERROR_EXPECTED;
1417                         wfProfileOut( __METHOD__ . '-checks' );
1418                         wfProfileOut( __METHOD__ );
1419                         return $status;
1420                 }
1421
1422                 if ( $wgUser->isBlockedFrom( $this->mTitle, false ) ) {
1423                         // Auto-block user's IP if the account was "hard" blocked
1424                         $wgUser->spreadAnyEditBlock();
1425                         # Check block state against master, thus 'false'.
1426                         $status->setResult( false, self::AS_BLOCKED_PAGE_FOR_USER );
1427                         wfProfileOut( __METHOD__ . '-checks' );
1428                         wfProfileOut( __METHOD__ );
1429                         return $status;
1430                 }
1431
1432                 $this->kblength = (int)( strlen( $this->textbox1 ) / 1024 );
1433                 if ( $this->kblength > $wgMaxArticleSize ) {
1434                         // Error will be displayed by showEditForm()
1435                         $this->tooBig = true;
1436                         $status->setResult( false, self::AS_CONTENT_TOO_BIG );
1437                         wfProfileOut( __METHOD__ . '-checks' );
1438                         wfProfileOut( __METHOD__ );
1439                         return $status;
1440                 }
1441
1442                 if ( !$wgUser->isAllowed( 'edit' ) ) {
1443                         if ( $wgUser->isAnon() ) {
1444                                 $status->setResult( false, self::AS_READ_ONLY_PAGE_ANON );
1445                                 wfProfileOut( __METHOD__ . '-checks' );
1446                                 wfProfileOut( __METHOD__ );
1447                                 return $status;
1448                         } else {
1449                                 $status->fatal( 'readonlytext' );
1450                                 $status->value = self::AS_READ_ONLY_PAGE_LOGGED;
1451                                 wfProfileOut( __METHOD__ . '-checks' );
1452                                 wfProfileOut( __METHOD__ );
1453                                 return $status;
1454                         }
1455                 }
1456
1457                 if ( wfReadOnly() ) {
1458                         $status->fatal( 'readonlytext' );
1459                         $status->value = self::AS_READ_ONLY_PAGE;
1460                         wfProfileOut( __METHOD__ . '-checks' );
1461                         wfProfileOut( __METHOD__ );
1462                         return $status;
1463                 }
1464                 if ( $wgUser->pingLimiter() ) {
1465                         $status->fatal( 'actionthrottledtext' );
1466                         $status->value = self::AS_RATE_LIMITED;
1467                         wfProfileOut( __METHOD__ . '-checks' );
1468                         wfProfileOut( __METHOD__ );
1469                         return $status;
1470                 }
1471
1472                 # If the article has been deleted while editing, don't save it without
1473                 # confirmation
1474                 if ( $this->wasDeletedSinceLastEdit() && !$this->recreate ) {
1475                         $status->setResult( false, self::AS_ARTICLE_WAS_DELETED );
1476                         wfProfileOut( __METHOD__ . '-checks' );
1477                         wfProfileOut( __METHOD__ );
1478                         return $status;
1479                 }
1480
1481                 wfProfileOut( __METHOD__ . '-checks' );
1482
1483                 # Load the page data from the master. If anything changes in the meantime,
1484                 # we detect it by using page_latest like a token in a 1 try compare-and-swap.
1485                 $this->mArticle->loadPageData( 'fromdbmaster' );
1486                 $new = !$this->mArticle->exists();
1487
1488                 if ( $new ) {
1489                         // Late check for create permission, just in case *PARANOIA*
1490                         if ( !$this->mTitle->userCan( 'create', $wgUser ) ) {
1491                                 $status->fatal( 'nocreatetext' );
1492                                 $status->value = self::AS_NO_CREATE_PERMISSION;
1493                                 wfDebug( __METHOD__ . ": no create permission\n" );
1494                                 wfProfileOut( __METHOD__ );
1495                                 return $status;
1496                         }
1497
1498                         # Don't save a new article if it's blank.
1499                         if ( $this->textbox1 == '' ) {
1500                                 $status->setResult( false, self::AS_BLANK_ARTICLE );
1501                                 wfProfileOut( __METHOD__ );
1502                                 return $status;
1503                         }
1504
1505                         if ( !$this->runPostMergeFilters( $textbox_content, $status, $wgUser ) ) {
1506                                 wfProfileOut( __METHOD__ );
1507                                 return $status;
1508                         }
1509
1510                         $content = $textbox_content;
1511
1512                         $result['sectionanchor'] = '';
1513                         if ( $this->section == 'new' ) {
1514                                 if ( $this->sectiontitle !== '' ) {
1515                                         // Insert the section title above the content.
1516                                         $content = $content->addSectionHeader( $this->sectiontitle );
1517
1518                                         // Jump to the new section
1519                                         $result['sectionanchor'] = $wgParser->guessLegacySectionNameFromWikiText( $this->sectiontitle );
1520
1521                                         // If no edit summary was specified, create one automatically from the section
1522                                         // title and have it link to the new section. Otherwise, respect the summary as
1523                                         // passed.
1524                                         if ( $this->summary === '' ) {
1525                                                 $cleanSectionTitle = $wgParser->stripSectionName( $this->sectiontitle );
1526                                                 $this->summary = wfMessage( 'newsectionsummary' )
1527                                                         ->rawParams( $cleanSectionTitle )->inContentLanguage()->text();
1528                                         }
1529                                 } elseif ( $this->summary !== '' ) {
1530                                         // Insert the section title above the content.
1531                                         $content = $content->addSectionHeader( $this->summary );
1532
1533                                         // Jump to the new section
1534                                         $result['sectionanchor'] = $wgParser->guessLegacySectionNameFromWikiText( $this->summary );
1535
1536                                         // Create a link to the new section from the edit summary.
1537                                         $cleanSummary = $wgParser->stripSectionName( $this->summary );
1538                                         $this->summary = wfMessage( 'newsectionsummary' )
1539                                                 ->rawParams( $cleanSummary )->inContentLanguage()->text();
1540                                 }
1541                         }
1542
1543                         $status->value = self::AS_SUCCESS_NEW_ARTICLE;
1544
1545                 } else { # not $new
1546
1547                         # Article exists. Check for edit conflict.
1548
1549                         $this->mArticle->clear(); # Force reload of dates, etc.
1550                         $timestamp = $this->mArticle->getTimestamp();
1551
1552                         wfDebug( "timestamp: {$timestamp}, edittime: {$this->edittime}\n" );
1553
1554                         if ( $timestamp != $this->edittime ) {
1555                                 $this->isConflict = true;
1556                                 if ( $this->section == 'new' ) {
1557                                         if ( $this->mArticle->getUserText() == $wgUser->getName() &&
1558                                                 $this->mArticle->getComment() == $this->summary ) {
1559                                                 // Probably a duplicate submission of a new comment.
1560                                                 // This can happen when squid resends a request after
1561                                                 // a timeout but the first one actually went through.
1562                                                 wfDebug( __METHOD__ . ": duplicate new section submission; trigger edit conflict!\n" );
1563                                         } else {
1564                                                 // New comment; suppress conflict.
1565                                                 $this->isConflict = false;
1566                                                 wfDebug( __METHOD__ . ": conflict suppressed; new section\n" );
1567                                         }
1568                                 } elseif ( $this->section == '' && Revision::userWasLastToEdit( DB_MASTER, $this->mTitle->getArticleID(),
1569                                                         $wgUser->getId(), $this->edittime ) ) {
1570                                         # Suppress edit conflict with self, except for section edits where merging is required.
1571                                         wfDebug( __METHOD__ . ": Suppressing edit conflict, same user.\n" );
1572                                         $this->isConflict = false;
1573                                 }
1574                         }
1575
1576                         // If sectiontitle is set, use it, otherwise use the summary as the section title (for
1577                         // backwards compatibility with old forms/bots).
1578                         if ( $this->sectiontitle !== '' ) {
1579                                 $sectionTitle = $this->sectiontitle;
1580                         } else {
1581                                 $sectionTitle = $this->summary;
1582                         }
1583
1584                         $content = null;
1585
1586                         if ( $this->isConflict ) {
1587                                 wfDebug( __METHOD__ . ": conflict! getting section '{$this->section}' for time '{$this->edittime}'"
1588                                                 . " (article time '{$timestamp}')\n" );
1589
1590                                 $content = $this->mArticle->replaceSectionContent( $this->section, $textbox_content, $sectionTitle, $this->edittime );
1591                         } else {
1592                                 wfDebug( __METHOD__ . ": getting section '{$this->section}'\n" );
1593                                 $content = $this->mArticle->replaceSectionContent( $this->section, $textbox_content, $sectionTitle );
1594                         }
1595
1596                         if ( is_null( $content ) ) {
1597                                 wfDebug( __METHOD__ . ": activating conflict; section replace failed.\n" );
1598                                 $this->isConflict = true;
1599                                 $content = $textbox_content; // do not try to merge here!
1600                         } elseif ( $this->isConflict ) {
1601                                 # Attempt merge
1602                                 if ( $this->mergeChangesIntoContent( $content ) ) {
1603                                         // Successful merge! Maybe we should tell the user the good news?
1604                                         $this->isConflict = false;
1605                                         wfDebug( __METHOD__ . ": Suppressing edit conflict, successful merge.\n" );
1606                                 } else {
1607                                         $this->section = '';
1608                                         $this->textbox1 = ContentHandler::getContentText( $content );
1609                                         wfDebug( __METHOD__ . ": Keeping edit conflict, failed merge.\n" );
1610                                 }
1611                         }
1612
1613                         if ( $this->isConflict ) {
1614                                 $status->setResult( false, self::AS_CONFLICT_DETECTED );
1615                                 wfProfileOut( __METHOD__ );
1616                                 return $status;
1617                         }
1618
1619                         if ( !$this->runPostMergeFilters( $content, $status, $wgUser ) ) {
1620                                 wfProfileOut( __METHOD__ );
1621                                 return $status;
1622                         }
1623
1624                         if ( $this->section == 'new' ) {
1625                                 // Handle the user preference to force summaries here
1626                                 if ( !$this->allowBlankSummary && trim( $this->summary ) == '' ) {
1627                                         $this->missingSummary = true;
1628                                         $status->fatal( 'missingsummary' ); // or 'missingcommentheader' if $section == 'new'. Blegh
1629                                         $status->value = self::AS_SUMMARY_NEEDED;
1630                                         wfProfileOut( __METHOD__ );
1631                                         return $status;
1632                                 }
1633
1634                                 // Do not allow the user to post an empty comment
1635                                 if ( $this->textbox1 == '' ) {
1636                                         $this->missingComment = true;
1637                                         $status->fatal( 'missingcommenttext' );
1638                                         $status->value = self::AS_TEXTBOX_EMPTY;
1639                                         wfProfileOut( __METHOD__ );
1640                                         return $status;
1641                                 }
1642                         } elseif ( !$this->allowBlankSummary
1643                                 && !$content->equals( $this->getOriginalContent() )
1644                                 && !$content->isRedirect()
1645                                 && md5( $this->summary ) == $this->autoSumm
1646                         ) {
1647                                 $this->missingSummary = true;
1648                                 $status->fatal( 'missingsummary' );
1649                                 $status->value = self::AS_SUMMARY_NEEDED;
1650                                 wfProfileOut( __METHOD__ );
1651                                 return $status;
1652                         }
1653
1654                         # All's well
1655                         wfProfileIn( __METHOD__ . '-sectionanchor' );
1656                         $sectionanchor = '';
1657                         if ( $this->section == 'new' ) {
1658                                 if ( $this->sectiontitle !== '' ) {
1659                                         $sectionanchor = $wgParser->guessLegacySectionNameFromWikiText( $this->sectiontitle );
1660                                         // If no edit summary was specified, create one automatically from the section
1661                                         // title and have it link to the new section. Otherwise, respect the summary as
1662                                         // passed.
1663                                         if ( $this->summary === '' ) {
1664                                                 $cleanSectionTitle = $wgParser->stripSectionName( $this->sectiontitle );
1665                                                 $this->summary = wfMessage( 'newsectionsummary' )
1666                                                         ->rawParams( $cleanSectionTitle )->inContentLanguage()->text();
1667                                         }
1668                                 } elseif ( $this->summary !== '' ) {
1669                                         $sectionanchor = $wgParser->guessLegacySectionNameFromWikiText( $this->summary );
1670                                         # This is a new section, so create a link to the new section
1671                                         # in the revision summary.
1672                                         $cleanSummary = $wgParser->stripSectionName( $this->summary );
1673                                         $this->summary = wfMessage( 'newsectionsummary' )
1674                                                 ->rawParams( $cleanSummary )->inContentLanguage()->text();
1675                                 }
1676                         } elseif ( $this->section != '' ) {
1677                                 # Try to get a section anchor from the section source, redirect to edited section if header found
1678                                 # XXX: might be better to integrate this into Article::replaceSection
1679                                 # for duplicate heading checking and maybe parsing
1680                                 $hasmatch = preg_match( "/^ *([=]{1,6})(.*?)(\\1) *\\n/i", $this->textbox1, $matches );
1681                                 # we can't deal with anchors, includes, html etc in the header for now,
1682                                 # headline would need to be parsed to improve this
1683                                 if ( $hasmatch && strlen( $matches[2] ) > 0 ) {
1684                                         $sectionanchor = $wgParser->guessLegacySectionNameFromWikiText( $matches[2] );
1685                                 }
1686                         }
1687                         $result['sectionanchor'] = $sectionanchor;
1688                         wfProfileOut( __METHOD__ . '-sectionanchor' );
1689
1690                         // Save errors may fall down to the edit form, but we've now
1691                         // merged the section into full text. Clear the section field
1692                         // so that later submission of conflict forms won't try to
1693                         // replace that into a duplicated mess.
1694                         $this->textbox1 = $this->toEditText( $content );
1695                         $this->section = '';
1696
1697                         $status->value = self::AS_SUCCESS_UPDATE;
1698                 }
1699
1700                 // Check for length errors again now that the section is merged in
1701                         $this->kblength = (int)( strlen( $this->toEditText( $content ) ) / 1024 );
1702                 if ( $this->kblength > $wgMaxArticleSize ) {
1703                         $this->tooBig = true;
1704                         $status->setResult( false, self::AS_MAX_ARTICLE_SIZE_EXCEEDED );
1705                         wfProfileOut( __METHOD__ );
1706                         return $status;
1707                 }
1708
1709                 $flags = EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1710                         ( $new ? EDIT_NEW : EDIT_UPDATE ) |
1711                         ( ( $this->minoredit && !$this->isNew ) ? EDIT_MINOR : 0 ) |
1712                         ( $bot ? EDIT_FORCE_BOT : 0 );
1713
1714                         $doEditStatus = $this->mArticle->doEditContent( $content, $this->summary, $flags,
1715                                                                                                                         false, null, $this->contentFormat );
1716
1717                 if ( !$doEditStatus->isOK() ) {
1718                         // Failure from doEdit()
1719                         // Show the edit conflict page for certain recognized errors from doEdit(),
1720                         // but don't show it for errors from extension hooks
1721                         $errors = $doEditStatus->getErrorsArray();
1722                         if ( in_array( $errors[0][0], array( 'edit-gone-missing', 'edit-conflict',
1723                                 'edit-already-exists' ) ) )
1724                         {
1725                                 $this->isConflict = true;
1726                                 // Destroys data doEdit() put in $status->value but who cares
1727                                 $doEditStatus->value = self::AS_END;
1728                         }
1729                         wfProfileOut( __METHOD__ );
1730                         return $doEditStatus;
1731                 }
1732
1733                 $result['nullEdit'] = $doEditStatus->hasMessage( 'edit-no-change' );
1734                 $result['redirect'] = $content->isRedirect();
1735                 $this->updateWatchlist();
1736                 wfProfileOut( __METHOD__ );
1737                 return $status;
1738         }
1739
1740         /**
1741          * Register the change of watch status
1742          */
1743         protected function updateWatchlist() {
1744                 global $wgUser;
1745
1746                 if ( $wgUser->isLoggedIn()
1747                         && $this->watchthis != $wgUser->isWatched( $this->mTitle, WatchedItem::IGNORE_USER_RIGHTS )
1748                 ) {
1749                         $fname = __METHOD__;
1750                         $title = $this->mTitle;
1751                         $watch = $this->watchthis;
1752
1753                         // Do this in its own transaction to reduce contention...
1754                         $dbw = wfGetDB( DB_MASTER );
1755                         $dbw->onTransactionIdle( function() use ( $dbw, $title, $watch, $wgUser, $fname ) {
1756                                 $dbw->begin( $fname );
1757                                 WatchAction::doWatchOrUnwatch( $watch, $title, $wgUser );
1758                                 $dbw->commit( $fname );
1759                         } );
1760                 }
1761         }
1762
1763         /**
1764          * Attempts to merge text content with base and current revisions
1765          *
1766          * @param $editText string
1767          *
1768          * @return bool
1769          * @deprecated since 1.21, use mergeChangesIntoContent() instead
1770          */
1771         function mergeChangesInto( &$editText ) {
1772                 ContentHandler::deprecated( __METHOD__, "1.21" );
1773
1774                 $editContent = $this->toEditContent( $editText );
1775
1776                 $ok = $this->mergeChangesIntoContent( $editContent );
1777
1778                 if ( $ok ) {
1779                         $editText = $this->toEditText( $editContent );
1780                         return true;
1781                 }
1782                 return false;
1783         }
1784
1785         /**
1786          * Attempts to do 3-way merge of edit content with a base revision
1787          * and current content, in case of edit conflict, in whichever way appropriate
1788          * for the content type.
1789          *
1790          * @since 1.21
1791          *
1792          * @param $editContent
1793          *
1794          * @return bool
1795          */
1796         private function mergeChangesIntoContent( &$editContent ) {
1797                 wfProfileIn( __METHOD__ );
1798
1799                 $db = wfGetDB( DB_MASTER );
1800
1801                 // This is the revision the editor started from
1802                 $baseRevision = $this->getBaseRevision();
1803                 $baseContent = $baseRevision ? $baseRevision->getContent() : null;
1804
1805                 if ( is_null( $baseContent ) ) {
1806                         wfProfileOut( __METHOD__ );
1807                         return false;
1808                 }
1809
1810                 // The current state, we want to merge updates into it
1811                 $currentRevision = Revision::loadFromTitle( $db, $this->mTitle );
1812                 $currentContent = $currentRevision ? $currentRevision->getContent() : null;
1813
1814                 if ( is_null( $currentContent ) ) {
1815                         wfProfileOut( __METHOD__ );
1816                         return false;
1817                 }
1818
1819                 $handler = ContentHandler::getForModelID( $baseContent->getModel() );
1820
1821                 $result = $handler->merge3( $baseContent, $editContent, $currentContent );
1822
1823                 if ( $result ) {
1824                         $editContent = $result;
1825                         wfProfileOut( __METHOD__ );
1826                         return true;
1827                 }
1828
1829                 wfProfileOut( __METHOD__ );
1830                 return false;
1831         }
1832
1833         /**
1834          * @return Revision
1835          */
1836         function getBaseRevision() {
1837                 if ( !$this->mBaseRevision ) {
1838                         $db = wfGetDB( DB_MASTER );
1839                         $baseRevision = Revision::loadFromTimestamp(
1840                                 $db, $this->mTitle, $this->edittime );
1841                         return $this->mBaseRevision = $baseRevision;
1842                 } else {
1843                         return $this->mBaseRevision;
1844                 }
1845         }
1846
1847         /**
1848          * Check given input text against $wgSpamRegex, and return the text of the first match.
1849          *
1850          * @param $text string
1851          *
1852          * @return string|bool matching string or false
1853          */
1854         public static function matchSpamRegex( $text ) {
1855                 global $wgSpamRegex;
1856                 // For back compatibility, $wgSpamRegex may be a single string or an array of regexes.
1857                 $regexes = (array)$wgSpamRegex;
1858                 return self::matchSpamRegexInternal( $text, $regexes );
1859         }
1860
1861         /**
1862          * Check given input text against $wgSpamRegex, and return the text of the first match.
1863          *
1864          * @param $text string
1865          *
1866          * @return string|bool  matching string or false
1867          */
1868         public static function matchSummarySpamRegex( $text ) {
1869                 global $wgSummarySpamRegex;
1870                 $regexes = (array)$wgSummarySpamRegex;
1871                 return self::matchSpamRegexInternal( $text, $regexes );
1872         }
1873
1874         /**
1875          * @param $text string
1876          * @param $regexes array
1877          * @return bool|string
1878          */
1879         protected static function matchSpamRegexInternal( $text, $regexes ) {
1880                 foreach ( $regexes as $regex ) {
1881                         $matches = array();
1882                         if ( preg_match( $regex, $text, $matches ) ) {
1883                                 return $matches[0];
1884                         }
1885                 }
1886                 return false;
1887         }
1888
1889         function setHeaders() {
1890                 global $wgOut, $wgUser;
1891
1892                 $wgOut->addModules( 'mediawiki.action.edit' );
1893
1894                 if ( $wgUser->getOption( 'uselivepreview', false ) ) {
1895                         $wgOut->addModules( 'mediawiki.action.edit.preview' );
1896                 }
1897
1898                 if ( $wgUser->getOption( 'useeditwarning', false ) ) {
1899                         $wgOut->addModules( 'mediawiki.action.edit.editWarning' );
1900                 }
1901
1902                 // Bug #19334: textarea jumps when editing articles in IE8
1903                 $wgOut->addStyle( 'common/IE80Fixes.css', 'screen', 'IE 8' );
1904
1905                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1906
1907                 # Enabled article-related sidebar, toplinks, etc.
1908                 $wgOut->setArticleRelated( true );
1909
1910                 $contextTitle = $this->getContextTitle();
1911                 if ( $this->isConflict ) {
1912                         $msg = 'editconflict';
1913                 } elseif ( $contextTitle->exists() && $this->section != '' ) {
1914                         $msg = $this->section == 'new' ? 'editingcomment' : 'editingsection';
1915                 } else {
1916                         $msg = $contextTitle->exists() || ( $contextTitle->getNamespace() == NS_MEDIAWIKI && $contextTitle->getDefaultMessageText() !== false ) ?
1917                                 'editing' : 'creating';
1918                 }
1919                 # Use the title defined by DISPLAYTITLE magic word when present
1920                 $displayTitle = isset( $this->mParserOutput ) ? $this->mParserOutput->getDisplayTitle() : false;
1921                 if ( $displayTitle === false ) {
1922                         $displayTitle = $contextTitle->getPrefixedText();
1923                 }
1924                 $wgOut->setPageTitle( wfMessage( $msg, $displayTitle ) );
1925         }
1926
1927         /**
1928          * Show all applicable editing introductions
1929          */
1930         protected function showIntro() {
1931                 global $wgOut, $wgUser;
1932                 if ( $this->suppressIntro ) {
1933                         return;
1934                 }
1935
1936                 $namespace = $this->mTitle->getNamespace();
1937
1938                 if ( $namespace == NS_MEDIAWIKI ) {
1939                         # Show a warning if editing an interface message
1940                         $wgOut->wrapWikiMsg( "<div class='mw-editinginterface'>\n$1\n</div>", 'editinginterface' );
1941                 } elseif ( $namespace == NS_FILE ) {
1942                         # Show a hint to shared repo
1943                         $file = wfFindFile( $this->mTitle );
1944                         if ( $file && !$file->isLocal() ) {
1945                                 $descUrl = $file->getDescriptionUrl();
1946                                 # there must be a description url to show a hint to shared repo
1947                                 if ( $descUrl ) {
1948                                         if ( !$this->mTitle->exists() ) {
1949                                                 $wgOut->wrapWikiMsg( "<div class=\"mw-sharedupload-desc-create\">\n$1\n</div>", array(
1950                                                                         'sharedupload-desc-create', $file->getRepo()->getDisplayName(), $descUrl
1951                                                 ) );
1952                                         } else {
1953                                                 $wgOut->wrapWikiMsg( "<div class=\"mw-sharedupload-desc-edit\">\n$1\n</div>", array(
1954                                                                         'sharedupload-desc-edit', $file->getRepo()->getDisplayName(), $descUrl
1955                                                 ) );
1956                                         }
1957                                 }
1958                         }
1959                 }
1960
1961                 # Show a warning message when someone creates/edits a user (talk) page but the user does not exist
1962                 # Show log extract when the user is currently blocked
1963                 if ( $namespace == NS_USER || $namespace == NS_USER_TALK ) {
1964                         $parts = explode( '/', $this->mTitle->getText(), 2 );
1965                         $username = $parts[0];
1966                         $user = User::newFromName( $username, false /* allow IP users*/ );
1967                         $ip = User::isIP( $username );
1968                         if ( !( $user && $user->isLoggedIn() ) && !$ip ) { # User does not exist
1969                                 $wgOut->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n$1\n</div>",
1970                                         array( 'userpage-userdoesnotexist', wfEscapeWikiText( $username ) ) );
1971                         } elseif ( $user->isBlocked() ) { # Show log extract if the user is currently blocked
1972                                 LogEventsList::showLogExtract(
1973                                         $wgOut,
1974                                         'block',
1975                                         $user->getUserPage(),
1976                                         '',
1977                                         array(
1978                                                 'lim' => 1,
1979                                                 'showIfEmpty' => false,
1980                                                 'msgKey' => array(
1981                                                         'blocked-notice-logextract',
1982                                                         $user->getName() # Support GENDER in notice
1983                                                 )
1984                                         )
1985                                 );
1986                         }
1987                 }
1988                 # Try to add a custom edit intro, or use the standard one if this is not possible.
1989                 if ( !$this->showCustomIntro() && !$this->mTitle->exists() ) {
1990                         if ( $wgUser->isLoggedIn() ) {
1991                                 $wgOut->wrapWikiMsg( "<div class=\"mw-newarticletext\">\n$1\n</div>", 'newarticletext' );
1992                         } else {
1993                                 $wgOut->wrapWikiMsg( "<div class=\"mw-newarticletextanon\">\n$1\n</div>", 'newarticletextanon' );
1994                         }
1995                 }
1996                 # Give a notice if the user is editing a deleted/moved page...
1997                 if ( !$this->mTitle->exists() ) {
1998                         LogEventsList::showLogExtract( $wgOut, array( 'delete', 'move' ), $this->mTitle,
1999                                 '',
2000                                 array(
2001                                         'lim' => 10,
2002                                         'conds' => array( "log_action != 'revision'" ),
2003                                         'showIfEmpty' => false,
2004                                         'msgKey' => array( 'recreate-moveddeleted-warn' )
2005                                 )
2006                         );
2007                 }
2008         }
2009
2010         /**
2011          * Attempt to show a custom editing introduction, if supplied
2012          *
2013          * @return bool
2014          */
2015         protected function showCustomIntro() {
2016                 if ( $this->editintro ) {
2017                         $title = Title::newFromText( $this->editintro );
2018                         if ( $title instanceof Title && $title->exists() && $title->userCan( 'read' ) ) {
2019                                 global $wgOut;
2020                                 // Added using template syntax, to take <noinclude>'s into account.
2021                                 $wgOut->addWikiTextTitleTidy( '{{:' . $title->getFullText() . '}}', $this->mTitle );
2022                                 return true;
2023                         }
2024                 }
2025                 return false;
2026         }
2027
2028         /**
2029          * Gets an editable textual representation of $content.
2030          * The textual representation can be turned by into a Content object by the
2031          * toEditContent() method.
2032          *
2033          * If $content is null or false or a string, $content is returned unchanged.
2034          *
2035          * If the given Content object is not of a type that can be edited using the text base EditPage,
2036          * an exception will be raised. Set $this->allowNonTextContent to true to allow editing of non-textual
2037          * content.
2038          *
2039          * @param Content|null|bool|string $content
2040          * @return String the editable text form of the content.
2041          *
2042          * @throws MWException if $content is not an instance of TextContent and $this->allowNonTextContent is not true.
2043          */
2044         protected function toEditText( $content ) {
2045                 if ( $content === null || $content === false ) {
2046                         return $content;
2047                 }
2048
2049                 if ( is_string( $content ) ) {
2050                         return $content;
2051                 }
2052
2053                 if ( !$this->allowNonTextContent && !( $content instanceof TextContent ) ) {
2054                         throw new MWException( "This content model can not be edited as text: "
2055                                                                 . ContentHandler::getLocalizedName( $content->getModel() ) );
2056                 }
2057
2058                 return $content->serialize( $this->contentFormat );
2059         }
2060
2061         /**
2062          * Turns the given text into a Content object by unserializing it.
2063          *
2064          * If the resulting Content object is not of a type that can be edited using the text base EditPage,
2065          * an exception will be raised. Set $this->allowNonTextContent to true to allow editing of non-textual
2066          * content.
2067          *
2068          * @param string|null|bool $text Text to unserialize
2069          * @return Content The content object created from $text. If $text was false or null, false resp. null will be
2070          *                 returned instead.
2071          *
2072          * @throws MWException if unserializing the text results in a Content object that is not an instance of TextContent
2073          *          and $this->allowNonTextContent is not true.
2074          */
2075         protected function toEditContent( $text ) {
2076                 if ( $text === false || $text === null ) {
2077                         return $text;
2078                 }
2079
2080                 $content = ContentHandler::makeContent( $text, $this->getTitle(),
2081                         $this->contentModel, $this->contentFormat );
2082
2083                 if ( !$this->allowNonTextContent && !( $content instanceof TextContent ) ) {
2084                         throw new MWException( "This content model can not be edited as text: "
2085                                 . ContentHandler::getLocalizedName( $content->getModel() ) );
2086                 }
2087
2088                 return $content;
2089         }
2090
2091         /**
2092          * Send the edit form and related headers to $wgOut
2093          * @param $formCallback Callback|null that takes an OutputPage parameter; will be called
2094          *     during form output near the top, for captchas and the like.
2095          */
2096         function showEditForm( $formCallback = null ) {
2097                 global $wgOut, $wgUser;
2098
2099                 wfProfileIn( __METHOD__ );
2100
2101                 # need to parse the preview early so that we know which templates are used,
2102                 # otherwise users with "show preview after edit box" will get a blank list
2103                 # we parse this near the beginning so that setHeaders can do the title
2104                 # setting work instead of leaving it in getPreviewText
2105                 $previewOutput = '';
2106                 if ( $this->formtype == 'preview' ) {
2107                         $previewOutput = $this->getPreviewText();
2108                 }
2109
2110                 wfRunHooks( 'EditPage::showEditForm:initial', array( &$this, &$wgOut ) );
2111
2112                 $this->setHeaders();
2113
2114                 if ( $this->showHeader() === false ) {
2115                         wfProfileOut( __METHOD__ );
2116                         return;
2117                 }
2118
2119                 $wgOut->addHTML( $this->editFormPageTop );
2120
2121                 if ( $wgUser->getOption( 'previewontop' ) ) {
2122                         $this->displayPreviewArea( $previewOutput, true );
2123                 }
2124
2125                 $wgOut->addHTML( $this->editFormTextTop );
2126
2127                 $showToolbar = true;
2128                 if ( $this->wasDeletedSinceLastEdit() ) {
2129                         if ( $this->formtype == 'save' ) {
2130                                 // Hide the toolbar and edit area, user can click preview to get it back
2131                                 // Add an confirmation checkbox and explanation.
2132                                 $showToolbar = false;
2133                         } else {
2134                                 $wgOut->wrapWikiMsg( "<div class='error mw-deleted-while-editing'>\n$1\n</div>",
2135                                         'deletedwhileediting' );
2136                         }
2137                 }
2138
2139                 // @todo add EditForm plugin interface and use it here!
2140                 //       search for textarea1 and textares2, and allow EditForm to override all uses.
2141                 $wgOut->addHTML( Html::openElement( 'form', array( 'id' => self::EDITFORM_ID, 'name' => self::EDITFORM_ID,
2142                         'method' => 'post', 'action' => $this->getActionURL( $this->getContextTitle() ),
2143                         'enctype' => 'multipart/form-data' ) ) );
2144
2145                 if ( is_callable( $formCallback ) ) {
2146                         call_user_func_array( $formCallback, array( &$wgOut ) );
2147                 }
2148
2149                 wfRunHooks( 'EditPage::showEditForm:fields', array( &$this, &$wgOut ) );
2150
2151                 // Put these up at the top to ensure they aren't lost on early form submission
2152                 $this->showFormBeforeText();
2153
2154                 if ( $this->wasDeletedSinceLastEdit() && 'save' == $this->formtype ) {
2155                         $username = $this->lastDelete->user_name;
2156                         $comment = $this->lastDelete->log_comment;
2157
2158                         // It is better to not parse the comment at all than to have templates expanded in the middle
2159                         // TODO: can the checkLabel be moved outside of the div so that wrapWikiMsg could be used?
2160                         $key = $comment === ''
2161                                 ? 'confirmrecreate-noreason'
2162                                 : 'confirmrecreate';
2163                         $wgOut->addHTML(
2164                                 '<div class="mw-confirm-recreate">' .
2165                                         wfMessage( $key, $username, "<nowiki>$comment</nowiki>" )->parse() .
2166                                 Xml::checkLabel( wfMessage( 'recreate' )->text(), 'wpRecreate', 'wpRecreate', false,
2167                                         array( 'title' => Linker::titleAttrib( 'recreate' ), 'tabindex' => 1, 'id' => 'wpRecreate' )
2168                                 ) .
2169                                 '</div>'
2170                         );
2171                 }
2172
2173                 # When the summary is hidden, also hide them on preview/show changes
2174                 if ( $this->nosummary ) {
2175                         $wgOut->addHTML( Html::hidden( 'nosummary', true ) );
2176                 }
2177
2178                 # If a blank edit summary was previously provided, and the appropriate
2179                 # user preference is active, pass a hidden tag as wpIgnoreBlankSummary. This will stop the
2180                 # user being bounced back more than once in the event that a summary
2181                 # is not required.
2182                 #####
2183                 # For a bit more sophisticated detection of blank summaries, hash the
2184                 # automatic one and pass that in the hidden field wpAutoSummary.
2185                 if ( $this->missingSummary || ( $this->section == 'new' && $this->nosummary ) ) {
2186                         $wgOut->addHTML( Html::hidden( 'wpIgnoreBlankSummary', true ) );
2187                 }
2188
2189                 if ( $this->undidRev ) {
2190                         $wgOut->addHTML( Html::hidden( 'wpUndidRevision', $this->undidRev ) );
2191                 }
2192
2193                 if ( $this->hasPresetSummary ) {
2194                         // If a summary has been preset using &summary= we don't want to prompt for
2195                         // a different summary. Only prompt for a summary if the summary is blanked.
2196                         // (Bug 17416)
2197                         $this->autoSumm = md5( '' );
2198                 }
2199
2200                 $autosumm = $this->autoSumm ? $this->autoSumm : md5( $this->summary );
2201                 $wgOut->addHTML( Html::hidden( 'wpAutoSummary', $autosumm ) );
2202
2203                 $wgOut->addHTML( Html::hidden( 'oldid', $this->oldid ) );
2204
2205                 $wgOut->addHTML( Html::hidden( 'format', $this->contentFormat ) );
2206                 $wgOut->addHTML( Html::hidden( 'model', $this->contentModel ) );
2207
2208                 if ( $this->section == 'new' ) {
2209                         $this->showSummaryInput( true, $this->summary );
2210                         $wgOut->addHTML( $this->getSummaryPreview( true, $this->summary ) );
2211                 }
2212
2213                 $wgOut->addHTML( $this->editFormTextBeforeContent );
2214
2215                 if ( !$this->isCssJsSubpage && $showToolbar && $wgUser->getOption( 'showtoolbar' ) ) {
2216                         $wgOut->addHTML( EditPage::getEditToolbar() );
2217                 }
2218
2219                 if ( $this->isConflict ) {
2220                         // In an edit conflict bypass the overridable content form method
2221                         // and fallback to the raw wpTextbox1 since editconflicts can't be
2222                         // resolved between page source edits and custom ui edits using the
2223                         // custom edit ui.
2224                         $this->textbox2 = $this->textbox1;
2225
2226                         $content = $this->getCurrentContent();
2227                         $this->textbox1 = $this->toEditText( $content );
2228
2229                         $this->showTextbox1();
2230                 } else {
2231                         $this->showContentForm();
2232                 }
2233
2234                 $wgOut->addHTML( $this->editFormTextAfterContent );
2235
2236                 $this->showStandardInputs();
2237
2238                 $this->showFormAfterText();
2239
2240                 $this->showTosSummary();
2241
2242                 $this->showEditTools();
2243
2244                 $wgOut->addHTML( $this->editFormTextAfterTools . "\n" );
2245
2246                 $wgOut->addHTML( Html::rawElement( 'div', array( 'class' => 'templatesUsed' ),
2247                         Linker::formatTemplates( $this->getTemplates(), $this->preview, $this->section != '' ) ) );
2248
2249                 $wgOut->addHTML( Html::rawElement( 'div', array( 'class' => 'hiddencats' ),
2250                         Linker::formatHiddenCategories( $this->mArticle->getHiddenCategories() ) ) );
2251
2252                 if ( $this->isConflict ) {
2253                         try {
2254                                 $this->showConflict();
2255                         } catch ( MWContentSerializationException $ex ) {
2256                                 // this can't really happen, but be nice if it does.
2257                                 $msg = wfMessage( 'content-failed-to-parse', $this->contentModel, $this->contentFormat, $ex->getMessage() );
2258                                 $wgOut->addWikiText( '<div class="error">' . $msg->text() . '</div>' );
2259                         }
2260                 }
2261
2262                 $wgOut->addHTML( $this->editFormTextBottom . "\n</form>\n" );
2263
2264                 if ( !$wgUser->getOption( 'previewontop' ) ) {
2265                         $this->displayPreviewArea( $previewOutput, false );
2266                 }
2267
2268                 wfProfileOut( __METHOD__ );
2269         }
2270
2271         /**
2272          * Extract the section title from current section text, if any.
2273          *
2274          * @param string $text
2275          * @return Mixed|string or false
2276          */
2277         public static function extractSectionTitle( $text ) {
2278                 preg_match( "/^(=+)(.+)\\1\\s*(\n|$)/i", $text, $matches );
2279                 if ( !empty( $matches[2] ) ) {
2280                         global $wgParser;
2281                         return $wgParser->stripSectionName( trim( $matches[2] ) );
2282                 } else {
2283                         return false;
2284                 }
2285         }
2286
2287         protected function showHeader() {
2288                 global $wgOut, $wgUser, $wgMaxArticleSize, $wgLang;
2289
2290                 if ( $this->mTitle->isTalkPage() ) {
2291                         $wgOut->addWikiMsg( 'talkpagetext' );
2292                 }
2293
2294                 // Add edit notices
2295                 $wgOut->addHTML( implode( "\n", $this->mTitle->getEditNotices() ) );
2296
2297                 if ( $this->isConflict ) {
2298                         $wgOut->wrapWikiMsg( "<div class='mw-explainconflict'>\n$1\n</div>", 'explainconflict' );
2299                         $this->edittime = $this->mArticle->getTimestamp();
2300                 } else {
2301                         if ( $this->section != '' && !$this->isSectionEditSupported() ) {
2302                                 // We use $this->section to much before this and getVal('wgSection') directly in other places
2303                                 // at this point we can't reset $this->section to '' to fallback to non-section editing.
2304                                 // Someone is welcome to try refactoring though
2305                                 $wgOut->showErrorPage( 'sectioneditnotsupported-title', 'sectioneditnotsupported-text' );
2306                                 return false;
2307                         }
2308
2309                         if ( $this->section != '' && $this->section != 'new' ) {
2310                                 if ( !$this->summary && !$this->preview && !$this->diff ) {
2311                                         $sectionTitle = self::extractSectionTitle( $this->textbox1 ); //FIXME: use Content object
2312                                         if ( $sectionTitle !== false ) {
2313                                                 $this->summary = "/* $sectionTitle */ ";
2314                                         }
2315                                 }
2316                         }
2317
2318                         if ( $this->missingComment ) {
2319                                 $wgOut->wrapWikiMsg( "<div id='mw-missingcommenttext'>\n$1\n</div>", 'missingcommenttext' );
2320                         }
2321
2322                         if ( $this->missingSummary && $this->section != 'new' ) {
2323                                 $wgOut->wrapWikiMsg( "<div id='mw-missingsummary'>\n$1\n</div>", 'missingsummary' );
2324                         }
2325
2326                         if ( $this->missingSummary && $this->section == 'new' ) {
2327                                 $wgOut->wrapWikiMsg( "<div id='mw-missingcommentheader'>\n$1\n</div>", 'missingcommentheader' );
2328                         }
2329
2330                         if ( $this->hookError !== '' ) {
2331                                 $wgOut->addWikiText( $this->hookError );
2332                         }
2333
2334                         if ( !$this->checkUnicodeCompliantBrowser() ) {
2335                                 $wgOut->addWikiMsg( 'nonunicodebrowser' );
2336                         }
2337
2338                         if ( $this->section != 'new' ) {
2339                                 $revision = $this->mArticle->getRevisionFetched();
2340                                 if ( $revision ) {
2341                                         // Let sysop know that this will make private content public if saved
2342
2343                                         if ( !$revision->userCan( Revision::DELETED_TEXT, $wgUser ) ) {
2344                                                 $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", 'rev-deleted-text-permission' );
2345                                         } elseif ( $revision->isDeleted( Revision::DELETED_TEXT ) ) {
2346                                                 $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", 'rev-deleted-text-view' );
2347                                         }
2348
2349                                         if ( !$revision->isCurrent() ) {
2350                                                 $this->mArticle->setOldSubtitle( $revision->getId() );
2351                                                 $wgOut->addWikiMsg( 'editingold' );
2352                                         }
2353                                 } elseif ( $this->mTitle->exists() ) {
2354                                         // Something went wrong
2355
2356                                         $wgOut->wrapWikiMsg( "<div class='errorbox'>\n$1\n</div>\n",
2357                                                 array( 'missing-revision', $this->oldid ) );
2358                                 }
2359                         }
2360                 }
2361
2362                 if ( wfReadOnly() ) {
2363                         $wgOut->wrapWikiMsg( "<div id=\"mw-read-only-warning\">\n$1\n</div>", array( 'readonlywarning', wfReadOnlyReason() ) );
2364                 } elseif ( $wgUser->isAnon() ) {
2365                         if ( $this->formtype != 'preview' ) {
2366                                 $wgOut->wrapWikiMsg( "<div id=\"mw-anon-edit-warning\">\n$1</div>", 'anoneditwarning' );
2367                         } else {
2368                                 $wgOut->wrapWikiMsg( "<div id=\"mw-anon-preview-warning\">\n$1</div>", 'anonpreviewwarning' );
2369                         }
2370                 } else {
2371                         if ( $this->isCssJsSubpage ) {
2372                                 # Check the skin exists
2373                                 if ( $this->isWrongCaseCssJsPage ) {
2374                                         $wgOut->wrapWikiMsg( "<div class='error' id='mw-userinvalidcssjstitle'>\n$1\n</div>", array( 'userinvalidcssjstitle', $this->mTitle->getSkinFromCssJsSubpage() ) );
2375                                 }
2376                                 if ( $this->formtype !== 'preview' ) {
2377                                         if ( $this->isCssSubpage ) {
2378                                                 $wgOut->wrapWikiMsg( "<div id='mw-usercssyoucanpreview'>\n$1\n</div>", array( 'usercssyoucanpreview' ) );
2379                                         }
2380
2381                                         if ( $this->isJsSubpage ) {
2382                                                 $wgOut->wrapWikiMsg( "<div id='mw-userjsyoucanpreview'>\n$1\n</div>", array( 'userjsyoucanpreview' ) );
2383                                         }
2384                                 }
2385                         }
2386                 }
2387
2388                 if ( $this->mTitle->getNamespace() != NS_MEDIAWIKI && $this->mTitle->isProtected( 'edit' ) ) {
2389                         # Is the title semi-protected?
2390                         if ( $this->mTitle->isSemiProtected() ) {
2391                                 $noticeMsg = 'semiprotectedpagewarning';
2392                         } else {
2393                                 # Then it must be protected based on static groups (regular)
2394                                 $noticeMsg = 'protectedpagewarning';
2395                         }
2396                         LogEventsList::showLogExtract( $wgOut, 'protect', $this->mTitle, '',
2397                                 array( 'lim' => 1, 'msgKey' => array( $noticeMsg ) ) );
2398                 }
2399                 if ( $this->mTitle->isCascadeProtected() ) {
2400                         # Is this page under cascading protection from some source pages?
2401                         list( $cascadeSources, /* $restrictions */ ) = $this->mTitle->getCascadeProtectionSources();
2402                         $notice = "<div class='mw-cascadeprotectedwarning'>\n$1\n";
2403                         $cascadeSourcesCount = count( $cascadeSources );
2404                         if ( $cascadeSourcesCount > 0 ) {
2405                                 # Explain, and list the titles responsible
2406                                 foreach ( $cascadeSources as $page ) {
2407                                         $notice .= '* [[:' . $page->getPrefixedText() . "]]\n";
2408                                 }
2409                         }
2410                         $notice .= '</div>';
2411                         $wgOut->wrapWikiMsg( $notice, array( 'cascadeprotectedwarning', $cascadeSourcesCount ) );
2412                 }
2413                 if ( !$this->mTitle->exists() && $this->mTitle->getRestrictions( 'create' ) ) {
2414                         LogEventsList::showLogExtract( $wgOut, 'protect', $this->mTitle, '',
2415                                 array( 'lim' => 1,
2416                                         'showIfEmpty' => false,
2417                                         'msgKey' => array( 'titleprotectedwarning' ),
2418                                         'wrap' => "<div class=\"mw-titleprotectedwarning\">\n$1</div>" ) );
2419                 }
2420
2421                 if ( $this->kblength === false ) {
2422                         $this->kblength = (int)( strlen( $this->textbox1 ) / 1024 );
2423                 }
2424
2425                 if ( $this->tooBig || $this->kblength > $wgMaxArticleSize ) {
2426                         $wgOut->wrapWikiMsg( "<div class='error' id='mw-edit-longpageerror'>\n$1\n</div>",
2427                                 array( 'longpageerror', $wgLang->formatNum( $this->kblength ), $wgLang->formatNum( $wgMaxArticleSize ) ) );
2428                 } else {
2429                         if ( !wfMessage( 'longpage-hint' )->isDisabled() ) {
2430                                 $wgOut->wrapWikiMsg( "<div id='mw-edit-longpage-hint'>\n$1\n</div>",
2431                                         array( 'longpage-hint', $wgLang->formatSize( strlen( $this->textbox1 ) ), strlen( $this->textbox1 ) )
2432                                 );
2433                         }
2434                 }
2435                 # Add header copyright warning
2436                 $this->showHeaderCopyrightWarning();
2437         }
2438
2439         /**
2440          * Standard summary input and label (wgSummary), abstracted so EditPage
2441          * subclasses may reorganize the form.
2442          * Note that you do not need to worry about the label's for=, it will be
2443          * inferred by the id given to the input. You can remove them both by
2444          * passing array( 'id' => false ) to $userInputAttrs.
2445          *
2446          * @param string $summary The value of the summary input
2447          * @param string $labelText The html to place inside the label
2448          * @param array $inputAttrs of attrs to use on the input
2449          * @param array $spanLabelAttrs of attrs to use on the span inside the label
2450          *
2451          * @return array An array in the format array( $label, $input )
2452          */
2453         function getSummaryInput( $summary = "", $labelText = null, $inputAttrs = null, $spanLabelAttrs = null ) {
2454                 // Note: the maxlength is overridden in JS to 255 and to make it use UTF-8 bytes, not characters.
2455                 $inputAttrs = ( is_array( $inputAttrs ) ? $inputAttrs : array() ) + array(
2456                         'id' => 'wpSummary',
2457                         'maxlength' => '200',
2458                         'tabindex' => '1',
2459                         'size' => 60,
2460                         'spellcheck' => 'true',
2461                 ) + Linker::tooltipAndAccesskeyAttribs( 'summary' );
2462
2463                 $spanLabelAttrs = ( is_array( $spanLabelAttrs ) ? $spanLabelAttrs : array() ) + array(
2464                         'class' => $this->missingSummary ? 'mw-summarymissed' : 'mw-summary',
2465                         'id' => "wpSummaryLabel"
2466                 );
2467
2468                 $label = null;
2469                 if ( $labelText ) {
2470                         $label = Xml::tags( 'label', $inputAttrs['id'] ? array( 'for' => $inputAttrs['id'] ) : null, $labelText );
2471                         $label = Xml::tags( 'span', $spanLabelAttrs, $label );
2472                 }
2473
2474                 $input = Html::input( 'wpSummary', $summary, 'text', $inputAttrs );
2475
2476                 return array( $label, $input );
2477         }
2478
2479         /**
2480          * @param $isSubjectPreview Boolean: true if this is the section subject/title
2481          *                          up top, or false if this is the comment summary
2482          *                          down below the textarea
2483          * @param string $summary The text of the summary to display
2484          * @return String
2485          */
2486         protected function showSummaryInput( $isSubjectPreview, $summary = "" ) {
2487                 global $wgOut, $wgContLang;
2488                 # Add a class if 'missingsummary' is triggered to allow styling of the summary line
2489                 $summaryClass = $this->missingSummary ? 'mw-summarymissed' : 'mw-summary';
2490                 if ( $isSubjectPreview ) {
2491                         if ( $this->nosummary ) {
2492                                 return;
2493                         }
2494                 } else {
2495                         if ( !$this->mShowSummaryField ) {
2496                                 return;
2497                         }
2498                 }
2499                 $summary = $wgContLang->recodeForEdit( $summary );
2500                 $labelText = wfMessage( $isSubjectPreview ? 'subject' : 'summary' )->parse();
2501                 list( $label, $input ) = $this->getSummaryInput( $summary, $labelText, array( 'class' => $summaryClass ), array() );
2502                 $wgOut->addHTML( "{$label} {$input}" );
2503         }
2504
2505         /**
2506          * @param $isSubjectPreview Boolean: true if this is the section subject/title
2507          *                          up top, or false if this is the comment summary
2508          *                          down below the textarea
2509          * @param string $summary the text of the summary to display
2510          * @return String
2511          */
2512         protected function getSummaryPreview( $isSubjectPreview, $summary = "" ) {
2513                 // avoid spaces in preview, gets always trimmed on save
2514                 $summary = trim( $summary );
2515                 if ( !$summary || ( !$this->preview && !$this->diff ) ) {
2516                         return "";
2517                 }
2518
2519                 global $wgParser;
2520
2521                 if ( $isSubjectPreview ) {
2522                         $summary = wfMessage( 'newsectionsummary', $wgParser->stripSectionName( $summary ) )
2523                                 ->inContentLanguage()->text();
2524                 }
2525
2526                 $message = $isSubjectPreview ? 'subject-preview' : 'summary-preview';
2527
2528                 $summary = wfMessage( $message )->parse() . Linker::commentBlock( $summary, $this->mTitle, $isSubjectPreview );
2529                 return Xml::tags( 'div', array( 'class' => 'mw-summary-preview' ), $summary );
2530         }
2531
2532         protected function showFormBeforeText() {
2533                 global $wgOut;
2534                 $section = htmlspecialchars( $this->section );
2535                 $wgOut->addHTML( <<<HTML
2536 <input type='hidden' value="{$section}" name="wpSection" />
2537 <input type='hidden' value="{$this->starttime}" name="wpStarttime" />
2538 <input type='hidden' value="{$this->edittime}" name="wpEdittime" />
2539 <input type='hidden' value="{$this->scrolltop}" name="wpScrolltop" id="wpScrolltop" />
2540
2541 HTML
2542                 );
2543                 if ( !$this->checkUnicodeCompliantBrowser() ) {
2544                         $wgOut->addHTML( Html::hidden( 'safemode', '1' ) );
2545                 }
2546         }
2547
2548         protected function showFormAfterText() {
2549                 global $wgOut, $wgUser;
2550                 /**
2551                  * To make it harder for someone to slip a user a page
2552                  * which submits an edit form to the wiki without their
2553                  * knowledge, a random token is associated with the login
2554                  * session. If it's not passed back with the submission,
2555                  * we won't save the page, or render user JavaScript and
2556                  * CSS previews.
2557                  *
2558                  * For anon editors, who may not have a session, we just
2559                  * include the constant suffix to prevent editing from
2560                  * broken text-mangling proxies.
2561                  */
2562                 $wgOut->addHTML( "\n" . Html::hidden( "wpEditToken", $wgUser->getEditToken() ) . "\n" );
2563         }
2564
2565         /**
2566          * Subpage overridable method for printing the form for page content editing
2567          * By default this simply outputs wpTextbox1
2568          * Subclasses can override this to provide a custom UI for editing;
2569          * be it a form, or simply wpTextbox1 with a modified content that will be
2570          * reverse modified when extracted from the post data.
2571          * Note that this is basically the inverse for importContentFormData
2572          */
2573         protected function showContentForm() {
2574                 $this->showTextbox1();
2575         }
2576
2577         /**
2578          * Method to output wpTextbox1
2579          * The $textoverride method can be used by subclasses overriding showContentForm
2580          * to pass back to this method.
2581          *
2582          * @param array $customAttribs of html attributes to use in the textarea
2583          * @param string $textoverride optional text to override $this->textarea1 with
2584          */
2585         protected function showTextbox1( $customAttribs = null, $textoverride = null ) {
2586                 if ( $this->wasDeletedSinceLastEdit() && $this->formtype == 'save' ) {
2587                         $attribs = array( 'style' => 'display:none;' );
2588                 } else {
2589                         $classes = array(); // Textarea CSS
2590                         if ( $this->mTitle->getNamespace() != NS_MEDIAWIKI && $this->mTitle->isProtected( 'edit' ) ) {
2591                                 # Is the title semi-protected?
2592                                 if ( $this->mTitle->isSemiProtected() ) {
2593                                         $classes[] = 'mw-textarea-sprotected';
2594                                 } else {
2595                                         # Then it must be protected based on static groups (regular)
2596                                         $classes[] = 'mw-textarea-protected';
2597                                 }
2598                                 # Is the title cascade-protected?
2599                                 if ( $this->mTitle->isCascadeProtected() ) {
2600                                         $classes[] = 'mw-textarea-cprotected';
2601                                 }
2602                         }
2603
2604                         $attribs = array( 'tabindex' => 1 );
2605
2606                         if ( is_array( $customAttribs ) ) {
2607                                 $attribs += $customAttribs;
2608                         }
2609
2610                         if ( count( $classes ) ) {
2611                                 if ( isset( $attribs['class'] ) ) {
2612                                         $classes[] = $attribs['class'];
2613                                 }
2614                                 $attribs['class'] = implode( ' ', $classes );
2615                         }
2616                 }
2617
2618                 $this->showTextbox( $textoverride !== null ? $textoverride : $this->textbox1, 'wpTextbox1', $attribs );
2619         }
2620
2621         protected function showTextbox2() {
2622                 $this->showTextbox( $this->textbox2, 'wpTextbox2', array( 'tabindex' => 6, 'readonly' ) );
2623         }
2624
2625         protected function showTextbox( $text, $name, $customAttribs = array() ) {
2626                 global $wgOut, $wgUser;
2627
2628                 $wikitext = $this->safeUnicodeOutput( $text );
2629                 if ( strval( $wikitext ) !== '' ) {
2630                         // Ensure there's a newline at the end, otherwise adding lines
2631                         // is awkward.
2632                         // But don't add a newline if the ext is empty, or Firefox in XHTML
2633                         // mode will show an extra newline. A bit annoying.
2634                         $wikitext .= "\n";
2635                 }
2636
2637                 $attribs = $customAttribs + array(
2638                         'accesskey' => ',',
2639                         'id' => $name,
2640                         'cols' => $wgUser->getIntOption( 'cols' ),
2641                         'rows' => $wgUser->getIntOption( 'rows' ),
2642                         'style' => '' // avoid php notices when appending preferences (appending allows customAttribs['style'] to still work
2643                 );
2644
2645                 $pageLang = $this->mTitle->getPageLanguage();
2646                 $attribs['lang'] = $pageLang->getCode();
2647                 $attribs['dir'] = $pageLang->getDir();
2648
2649                 $wgOut->addHTML( Html::textarea( $name, $wikitext, $attribs ) );
2650         }
2651
2652         protected function displayPreviewArea( $previewOutput, $isOnTop = false ) {
2653                 global $wgOut;
2654                 $classes = array();
2655                 if ( $isOnTop ) {
2656                         $classes[] = 'ontop';
2657                 }
2658
2659                 $attribs = array( 'id' => 'wikiPreview', 'class' => implode( ' ', $classes ) );
2660
2661                 if ( $this->formtype != 'preview' ) {
2662                         $attribs['style'] = 'display: none;';
2663                 }
2664
2665                 $wgOut->addHTML( Xml::openElement( 'div', $attribs ) );
2666
2667                 if ( $this->formtype == 'preview' ) {
2668                         $this->showPreview( $previewOutput );
2669                 }
2670
2671                 $wgOut->addHTML( '</div>' );
2672
2673                 if ( $this->formtype == 'diff' ) {
2674                         try {
2675                                 $this->showDiff();
2676                         } catch ( MWContentSerializationException $ex ) {
2677                                 $msg = wfMessage( 'content-failed-to-parse', $this->contentModel, $this->contentFormat, $ex->getMessage() );
2678                                 $wgOut->addWikiText( '<div class="error">' . $msg->text() . '</div>' );
2679                         }
2680                 }
2681         }
2682
2683         /**
2684          * Append preview output to $wgOut.
2685          * Includes category rendering if this is a category page.
2686          *
2687          * @param string $text the HTML to be output for the preview.
2688          */
2689         protected function showPreview( $text ) {
2690                 global $wgOut;
2691                 if ( $this->mTitle->getNamespace() == NS_CATEGORY ) {
2692                         $this->mArticle->openShowCategory();
2693                 }
2694                 # This hook seems slightly odd here, but makes things more
2695                 # consistent for extensions.
2696                 wfRunHooks( 'OutputPageBeforeHTML', array( &$wgOut, &$text ) );
2697                 $wgOut->addHTML( $text );
2698                 if ( $this->mTitle->getNamespace() == NS_CATEGORY ) {
2699                         $this->mArticle->closeShowCategory();
2700                 }
2701         }
2702
2703         /**
2704          * Get a diff between the current contents of the edit box and the
2705          * version of the page we're editing from.
2706          *
2707          * If this is a section edit, we'll replace the section as for final
2708          * save and then make a comparison.
2709          */
2710         function showDiff() {
2711                 global $wgUser, $wgContLang, $wgOut;
2712
2713                 $oldtitlemsg = 'currentrev';
2714                 # if message does not exist, show diff against the preloaded default
2715                 if ( $this->mTitle->getNamespace() == NS_MEDIAWIKI && !$this->mTitle->exists() ) {
2716                         $oldtext = $this->mTitle->getDefaultMessageText();
2717                         if ( $oldtext !== false ) {
2718                                 $oldtitlemsg = 'defaultmessagetext';
2719                                 $oldContent = $this->toEditContent( $oldtext );
2720                         } else {
2721                                 $oldContent = null;
2722                         }
2723                 } else {
2724                         $oldContent = $this->getCurrentContent();
2725                 }
2726
2727                 $textboxContent = $this->toEditContent( $this->textbox1 );
2728
2729                 $newContent = $this->mArticle->replaceSectionContent(
2730                                                         $this->section, $textboxContent,
2731                                                         $this->summary, $this->edittime );
2732
2733                 if ( $newContent ) {
2734                         ContentHandler::runLegacyHooks( 'EditPageGetDiffText', array( $this, &$newContent ) );
2735                         wfRunHooks( 'EditPageGetDiffContent', array( $this, &$newContent ) );
2736
2737                         $popts = ParserOptions::newFromUserAndLang( $wgUser, $wgContLang );
2738                         $newContent = $newContent->preSaveTransform( $this->mTitle, $wgUser, $popts );
2739                 }
2740
2741                 if ( ( $oldContent && !$oldContent->isEmpty() ) || ( $newContent && !$newContent->isEmpty() ) ) {
2742                         $oldtitle = wfMessage( $oldtitlemsg )->parse();
2743                         $newtitle = wfMessage( 'yourtext' )->parse();
2744
2745                         if ( !$oldContent ) {
2746                                 $oldContent = $newContent->getContentHandler()->makeEmptyContent();
2747                         }
2748
2749                         if ( !$newContent ) {
2750                                 $newContent = $oldContent->getContentHandler()->makeEmptyContent();
2751                         }
2752
2753                         $de = $oldContent->getContentHandler()->createDifferenceEngine( $this->mArticle->getContext() );
2754                         $de->setContent( $oldContent, $newContent );
2755
2756                         $difftext = $de->getDiff( $oldtitle, $newtitle );
2757                         $de->showDiffStyle();
2758                 } else {
2759                         $difftext = '';
2760                 }
2761
2762                 $wgOut->addHTML( '<div id="wikiDiff">' . $difftext . '</div>' );
2763         }
2764
2765         /**
2766          * Show the header copyright warning.
2767          */
2768         protected function showHeaderCopyrightWarning() {
2769                 $msg = 'editpage-head-copy-warn';
2770                 if ( !wfMessage( $msg )->isDisabled() ) {
2771                         global $wgOut;
2772                         $wgOut->wrapWikiMsg( "<div class='editpage-head-copywarn'>\n$1\n</div>",
2773                                 'editpage-head-copy-warn' );
2774                 }
2775         }
2776
2777         /**
2778          * Give a chance for site and per-namespace customizations of
2779          * terms of service summary link that might exist separately
2780          * from the copyright notice.
2781          *
2782          * This will display between the save button and the edit tools,
2783          * so should remain short!
2784          */
2785         protected function showTosSummary() {
2786                 $msg = 'editpage-tos-summary';
2787                 wfRunHooks( 'EditPageTosSummary', array( $this->mTitle, &$msg ) );
2788                 if ( !wfMessage( $msg )->isDisabled() ) {
2789                         global $wgOut;
2790                         $wgOut->addHTML( '<div class="mw-tos-summary">' );
2791                         $wgOut->addWikiMsg( $msg );
2792                         $wgOut->addHTML( '</div>' );
2793                 }
2794         }
2795
2796         protected function showEditTools() {
2797                 global $wgOut;
2798                 $wgOut->addHTML( '<div class="mw-editTools">' .
2799                         wfMessage( 'edittools' )->inContentLanguage()->parse() .
2800                         '</div>' );
2801         }
2802
2803         /**
2804          * Get the copyright warning
2805          *
2806          * Renamed to getCopyrightWarning(), old name kept around for backwards compatibility
2807          */
2808         protected function getCopywarn() {
2809                 return self::getCopyrightWarning( $this->mTitle );
2810         }
2811
2812         public static function getCopyrightWarning( $title ) {
2813                 global $wgRightsText;
2814                 if ( $wgRightsText ) {
2815                         $copywarnMsg = array( 'copyrightwarning',
2816                                 '[[' . wfMessage( 'copyrightpage' )->inContentLanguage()->text() . ']]',
2817                                 $wgRightsText );
2818                 } else {
2819                         $copywarnMsg = array( 'copyrightwarning2',
2820                                 '[[' . wfMessage( 'copyrightpage' )->inContentLanguage()->text() . ']]' );
2821                 }
2822                 // Allow for site and per-namespace customization of contribution/copyright notice.
2823                 wfRunHooks( 'EditPageCopyrightWarning', array( $title, &$copywarnMsg ) );
2824
2825                 return "<div id=\"editpage-copywarn\">\n" .
2826                         call_user_func_array( 'wfMessage', $copywarnMsg )->plain() . "\n</div>";
2827         }
2828
2829         protected function showStandardInputs( &$tabindex = 2 ) {
2830                 global $wgOut;
2831                 $wgOut->addHTML( "<div class='editOptions'>\n" );
2832
2833                 if ( $this->section != 'new' ) {
2834                         $this->showSummaryInput( false, $this->summary );
2835                         $wgOut->addHTML( $this->getSummaryPreview( false, $this->summary ) );
2836                 }
2837
2838                 $checkboxes = $this->getCheckboxes( $tabindex,
2839                         array( 'minor' => $this->minoredit, 'watch' => $this->watchthis ) );
2840                 $wgOut->addHTML( "<div class='editCheckboxes'>" . implode( $checkboxes, "\n" ) . "</div>\n" );
2841
2842                 // Show copyright warning.
2843                 $wgOut->addWikiText( $this->getCopywarn() );
2844                 $wgOut->addHTML( $this->editFormTextAfterWarn );
2845
2846                 $wgOut->addHTML( "<div class='editButtons'>\n" );
2847                 $wgOut->addHTML( implode( $this->getEditButtons( $tabindex ), "\n" ) . "\n" );
2848
2849                 $cancel = $this->getCancelLink();
2850                 if ( $cancel !== '' ) {
2851                         $cancel .= wfMessage( 'pipe-separator' )->text();
2852                 }
2853                 $edithelpurl = Skin::makeInternalOrExternalUrl( wfMessage( 'edithelppage' )->inContentLanguage()->text() );
2854                 $edithelp = '<a target="helpwindow" href="' . $edithelpurl . '">' .
2855                         wfMessage( 'edithelp' )->escaped() . '</a> ' .
2856                         wfMessage( 'newwindow' )->parse();
2857                 $wgOut->addHTML( "      <span class='cancelLink'>{$cancel}</span>\n" );
2858                 $wgOut->addHTML( "      <span class='editHelp'>{$edithelp}</span>\n" );
2859                 $wgOut->addHTML( "</div><!-- editButtons -->\n" );
2860                 wfRunHooks( 'EditPage::showStandardInputs:options', array( $this, $wgOut, &$tabindex ) );
2861                 $wgOut->addHTML( "</div><!-- editOptions -->\n" );
2862         }
2863
2864         /**
2865          * Show an edit conflict. textbox1 is already shown in showEditForm().
2866          * If you want to use another entry point to this function, be careful.
2867          */
2868         protected function showConflict() {
2869                 global $wgOut;
2870
2871                 if ( wfRunHooks( 'EditPageBeforeConflictDiff', array( &$this, &$wgOut ) ) ) {
2872                         $wgOut->wrapWikiMsg( '<h2>$1</h2>', "yourdiff" );
2873
2874                         $content1 = $this->toEditContent( $this->textbox1 );
2875                         $content2 = $this->toEditContent( $this->textbox2 );
2876
2877                         $handler = ContentHandler::getForModelID( $this->contentModel );
2878                         $de = $handler->createDifferenceEngine( $this->mArticle->getContext() );
2879                         $de->setContent( $content2, $content1 );
2880                         $de->showDiff(
2881                                 wfMessage( 'yourtext' )->parse(),
2882                                 wfMessage( 'storedversion' )->text()
2883                         );
2884
2885                         $wgOut->wrapWikiMsg( '<h2>$1</h2>', "yourtext" );
2886                         $this->showTextbox2();
2887                 }
2888         }
2889
2890         /**
2891          * @return string
2892          */
2893         public function getCancelLink() {
2894                 $cancelParams = array();
2895                 if ( !$this->isConflict && $this->oldid > 0 ) {
2896                         $cancelParams['oldid'] = $this->oldid;
2897                 }
2898
2899                 return Linker::linkKnown(
2900                         $this->getContextTitle(),
2901                         wfMessage( 'cancel' )->parse(),
2902                         array( 'id' => 'mw-editform-cancel' ),
2903                         $cancelParams
2904                 );
2905         }
2906
2907         /**
2908          * Returns the URL to use in the form's action attribute.
2909          * This is used by EditPage subclasses when simply customizing the action
2910          * variable in the constructor is not enough. This can be used when the
2911          * EditPage lives inside of a Special page rather than a custom page action.
2912          *
2913          * @param $title Title object for which is being edited (where we go to for &action= links)
2914          * @return string
2915          */
2916         protected function getActionURL( Title $title ) {
2917                 return $title->getLocalURL( array( 'action' => $this->action ) );
2918         }
2919
2920         /**
2921          * Check if a page was deleted while the user was editing it, before submit.
2922          * Note that we rely on the logging table, which hasn't been always there,
2923          * but that doesn't matter, because this only applies to brand new
2924          * deletes.
2925          */
2926         protected function wasDeletedSinceLastEdit() {
2927                 if ( $this->deletedSinceEdit !== null ) {
2928                         return $this->deletedSinceEdit;
2929                 }
2930
2931                 $this->deletedSinceEdit = false;
2932
2933                 if ( $this->mTitle->isDeletedQuick() ) {
2934                         $this->lastDelete = $this->getLastDelete();
2935                         if ( $this->lastDelete ) {
2936                                 $deleteTime = wfTimestamp( TS_MW, $this->lastDelete->log_timestamp );
2937                                 if ( $deleteTime > $this->starttime ) {
2938                                         $this->deletedSinceEdit = true;
2939                                 }
2940                         }
2941                 }
2942
2943                 return $this->deletedSinceEdit;
2944         }
2945
2946         protected function getLastDelete() {
2947                 $dbr = wfGetDB( DB_SLAVE );
2948                 $data = $dbr->selectRow(
2949                         array( 'logging', 'user' ),
2950                         array(
2951                                 'log_type',
2952                                 'log_action',
2953                                 'log_timestamp',
2954                                 'log_user',
2955                                 'log_namespace',
2956                                 'log_title',
2957                                 'log_comment',
2958                                 'log_params',
2959                                 'log_deleted',
2960                                 'user_name'
2961                         ), array(
2962                                 'log_namespace' => $this->mTitle->getNamespace(),
2963                                 'log_title' => $this->mTitle->getDBkey(),
2964                                 'log_type' => 'delete',
2965                                 'log_action' => 'delete',
2966                                 'user_id=log_user'
2967                         ),
2968                         __METHOD__,
2969                         array( 'LIMIT' => 1, 'ORDER BY' => 'log_timestamp DESC' )
2970                 );
2971                 // Quick paranoid permission checks...
2972                 if ( is_object( $data ) ) {
2973                         if ( $data->log_deleted & LogPage::DELETED_USER ) {
2974                                 $data->user_name = wfMessage( 'rev-deleted-user' )->escaped();
2975                         }
2976
2977                         if ( $data->log_deleted & LogPage::DELETED_COMMENT ) {
2978                                 $data->log_comment = wfMessage( 'rev-deleted-comment' )->escaped();
2979                         }
2980                 }
2981                 return $data;
2982         }
2983
2984         /**
2985          * Get the rendered text for previewing.
2986          * @throws MWException
2987          * @return string
2988          */
2989         function getPreviewText() {
2990                 global $wgOut, $wgUser, $wgRawHtml, $wgLang;
2991
2992                 wfProfileIn( __METHOD__ );
2993
2994                 if ( $wgRawHtml && !$this->mTokenOk ) {
2995                         // Could be an offsite preview attempt. This is very unsafe if
2996                         // HTML is enabled, as it could be an attack.
2997                         $parsedNote = '';
2998                         if ( $this->textbox1 !== '' ) {
2999                                 // Do not put big scary notice, if previewing the empty
3000                                 // string, which happens when you initially edit
3001                                 // a category page, due to automatic preview-on-open.
3002                                 $parsedNote = $wgOut->parse( "<div class='previewnote'>" .
3003                                         wfMessage( 'session_fail_preview_html' )->text() . "</div>", true, /* interface */true );
3004                         }
3005                         wfProfileOut( __METHOD__ );
3006                         return $parsedNote;
3007                 }
3008
3009                 $note = '';
3010
3011                 try {
3012                         $content = $this->toEditContent( $this->textbox1 );
3013
3014                         $previewHTML = '';
3015                         if ( !wfRunHooks( 'AlternateEditPreview', array( $this, &$content, &$previewHTML, &$this->mParserOutput ) ) ) {
3016                                 wfProfileOut( __METHOD__ );
3017                                 return $previewHTML;
3018                         }
3019
3020                         if ( $this->mTriedSave && !$this->mTokenOk ) {
3021                                 if ( $this->mTokenOkExceptSuffix ) {
3022                                         $note = wfMessage( 'token_suffix_mismatch' )->plain();
3023
3024                                 } else {
3025                                         $note = wfMessage( 'session_fail_preview' )->plain();
3026                                 }
3027                         } elseif ( $this->incompleteForm ) {
3028                                 $note = wfMessage( 'edit_form_incomplete' )->plain();
3029                         } else {
3030                                 $note = wfMessage( 'previewnote' )->plain() .
3031                                         ' [[#' . self::EDITFORM_ID . '|' . $wgLang->getArrow() . ' ' . wfMessage( 'continue-editing' )->text() . ']]';
3032                         }
3033
3034                         $parserOptions = $this->mArticle->makeParserOptions( $this->mArticle->getContext() );
3035                         $parserOptions->setEditSection( false );
3036                         $parserOptions->setIsPreview( true );
3037                         $parserOptions->setIsSectionPreview( !is_null( $this->section ) && $this->section !== '' );
3038
3039                         # don't parse non-wikitext pages, show message about preview
3040                         if ( $this->mTitle->isCssJsSubpage() || $this->mTitle->isCssOrJsPage() ) {
3041                                 if ( $this->mTitle->isCssJsSubpage() ) {
3042                                         $level = 'user';
3043                                 } elseif ( $this->mTitle->isCssOrJsPage() ) {
3044                                         $level = 'site';
3045                                 } else {
3046                                         $level = false;
3047                                 }
3048
3049                                 if ( $content->getModel() == CONTENT_MODEL_CSS ) {
3050                                         $format = 'css';
3051                                 } elseif ( $content->getModel() == CONTENT_MODEL_JAVASCRIPT ) {
3052                                         $format = 'js';
3053                                 } else {
3054                                         $format = false;
3055                                 }
3056
3057                                 # Used messages to make sure grep find them:
3058                                 # Messages: usercsspreview, userjspreview, sitecsspreview, sitejspreview
3059                                 if ( $level && $format ) {
3060                                         $note = "<div id='mw-{$level}{$format}preview'>" . wfMessage( "{$level}{$format}preview" )->text() . "</div>";
3061                                 }
3062                         }
3063
3064                         $rt = $content->getRedirectChain();
3065                         if ( $rt ) {
3066                                 $previewHTML = $this->mArticle->viewRedirect( $rt, false );
3067                         } else {
3068
3069                                 # If we're adding a comment, we need to show the
3070                                 # summary as the headline
3071                                 if ( $this->section === "new" && $this->summary !== "" ) {
3072                                         $content = $content->addSectionHeader( $this->summary );
3073                                 }
3074
3075                                 $hook_args = array( $this, &$content );
3076                                 ContentHandler::runLegacyHooks( 'EditPageGetPreviewText', $hook_args );
3077                                 wfRunHooks( 'EditPageGetPreviewContent', $hook_args );
3078
3079                                 $parserOptions->enableLimitReport();
3080
3081                                 # For CSS/JS pages, we should have called the ShowRawCssJs hook here.
3082                                 # But it's now deprecated, so never mind
3083
3084                                 $content = $content->preSaveTransform( $this->mTitle, $wgUser, $parserOptions );
3085                                 $parserOutput = $content->getParserOutput( $this->getArticle()->getTitle(), null, $parserOptions );
3086
3087                                 $previewHTML = $parserOutput->getText();
3088                                 $this->mParserOutput = $parserOutput;
3089                                 $wgOut->addParserOutputNoText( $parserOutput );
3090
3091                                 if ( count( $parserOutput->getWarnings() ) ) {
3092                                         $note .= "\n\n" . implode( "\n\n", $parserOutput->getWarnings() );
3093                                 }
3094                         }
3095                 } catch ( MWContentSerializationException $ex ) {
3096                         $m = wfMessage( 'content-failed-to-parse', $this->contentModel, $this->contentFormat, $ex->getMessage() );
3097                         $note .= "\n\n" . $m->parse();
3098                         $previewHTML = '';
3099                 }
3100
3101                 if ( $this->isConflict ) {
3102                         $conflict = '<h2 id="mw-previewconflict">' . wfMessage( 'previewconflict' )->escaped() . "</h2>\n";
3103                 } else {
3104                         $conflict = '<hr />';
3105                 }
3106
3107                 $previewhead = "<div class='previewnote'>\n" .
3108                         '<h2 id="mw-previewheader">' . wfMessage( 'preview' )->escaped() . "</h2>" .
3109                         $wgOut->parse( $note, true, /* interface */true ) . $conflict . "</div>\n";
3110
3111                 $pageLang = $this->mTitle->getPageLanguage();
3112                 $attribs = array( 'lang' => $pageLang->getCode(), 'dir' => $pageLang->getDir(),
3113                         'class' => 'mw-content-' . $pageLang->getDir() );
3114                 $previewHTML = Html::rawElement( 'div', $attribs, $previewHTML );
3115
3116                 wfProfileOut( __METHOD__ );
3117                 return $previewhead . $previewHTML . $this->previewTextAfterContent;
3118         }
3119
3120         /**
3121          * @return Array
3122          */
3123         function getTemplates() {
3124                 if ( $this->preview || $this->section != '' ) {
3125                         $templates = array();
3126                         if ( !isset( $this->mParserOutput ) ) {
3127                                 return $templates;
3128                         }
3129                         foreach ( $this->mParserOutput->getTemplates() as $ns => $template ) {
3130                                 foreach ( array_keys( $template ) as $dbk ) {
3131                                         $templates[] = Title::makeTitle( $ns, $dbk );
3132                                 }
3133                         }
3134                         return $templates;
3135                 } else {
3136                         return $this->mTitle->getTemplateLinksFrom();
3137                 }
3138         }
3139
3140         /**
3141          * Shows a bulletin board style toolbar for common editing functions.
3142          * It can be disabled in the user preferences.
3143          * The necessary JavaScript code can be found in skins/common/edit.js.
3144          *
3145          * @return string
3146          */
3147         static function getEditToolbar() {
3148                 global $wgStylePath, $wgContLang, $wgLang, $wgOut;
3149                 global $wgUseTeX, $wgEnableUploads, $wgForeignFileRepos;
3150
3151                 $imagesAvailable = $wgEnableUploads || count( $wgForeignFileRepos );
3152
3153                 /**
3154                  * $toolarray is an array of arrays each of which includes the
3155                  * filename of the button image (without path), the opening
3156                  * tag, the closing tag, optionally a sample text that is
3157                  * inserted between the two when no selection is highlighted
3158                  * and.  The tip text is shown when the user moves the mouse
3159                  * over the button.
3160                  *
3161                  * Also here: accesskeys (key), which are not used yet until
3162                  * someone can figure out a way to make them work in
3163                  * IE. However, we should make sure these keys are not defined
3164                  * on the edit page.
3165                  */
3166                 $toolarray = array(
3167                         array(
3168                                 'image'  => $wgLang->getImageFile( 'button-bold' ),
3169                                 'id'     => 'mw-editbutton-bold',
3170                                 'open'   => '\'\'\'',
3171                                 'close'  => '\'\'\'',
3172                                 'sample' => wfMessage( 'bold_sample' )->text(),
3173                                 'tip'    => wfMessage( 'bold_tip' )->text(),
3174                                 'key'    => 'B'
3175                         ),
3176                         array(
3177                                 'image'  => $wgLang->getImageFile( 'button-italic' ),
3178                                 'id'     => 'mw-editbutton-italic',
3179                                 'open'   => '\'\'',
3180                                 'close'  => '\'\'',
3181                                 'sample' => wfMessage( 'italic_sample' )->text(),
3182                                 'tip'    => wfMessage( 'italic_tip' )->text(),
3183                                 'key'    => 'I'
3184                         ),
3185                         array(
3186                                 'image'  => $wgLang->getImageFile( 'button-link' ),
3187                                 'id'     => 'mw-editbutton-link',
3188                                 'open'   => '[[',
3189                                 'close'  => ']]',
3190                                 'sample' => wfMessage( 'link_sample' )->text(),
3191                                 'tip'    => wfMessage( 'link_tip' )->text(),
3192                                 'key'    => 'L'
3193                         ),
3194                         array(
3195                                 'image'  => $wgLang->getImageFile( 'button-extlink' ),
3196                                 'id'     => 'mw-editbutton-extlink',
3197                                 'open'   => '[',
3198                                 'close'  => ']',
3199                                 'sample' => wfMessage( 'extlink_sample' )->text(),
3200                                 'tip'    => wfMessage( 'extlink_tip' )->text(),
3201                                 'key'    => 'X'
3202                         ),
3203                         array(
3204                                 'image'  => $wgLang->getImageFile( 'button-headline' ),
3205                                 'id'     => 'mw-editbutton-headline',
3206                                 'open'   => "\n== ",
3207                                 'close'  => " ==\n",
3208                                 'sample' => wfMessage( 'headline_sample' )->text(),
3209                                 'tip'    => wfMessage( 'headline_tip' )->text(),
3210                                 'key'    => 'H'
3211                         ),
3212                         $imagesAvailable ? array(
3213                                 'image'  => $wgLang->getImageFile( 'button-image' ),
3214                                 'id'     => 'mw-editbutton-image',
3215                                 'open'   => '[[' . $wgContLang->getNsText( NS_FILE ) . ':',
3216                                 'close'  => ']]',
3217                                 'sample' => wfMessage( 'image_sample' )->text(),
3218                                 'tip'    => wfMessage( 'image_tip' )->text(),
3219                                 'key'    => 'D',
3220                         ) : false,
3221                         $imagesAvailable ? array(
3222                                 'image'  => $wgLang->getImageFile( 'button-media' ),
3223                                 'id'     => 'mw-editbutton-media',
3224                                 'open'   => '[[' . $wgContLang->getNsText( NS_MEDIA ) . ':',
3225                                 'close'  => ']]',
3226                                 'sample' => wfMessage( 'media_sample' )->text(),
3227                                 'tip'    => wfMessage( 'media_tip' )->text(),
3228                                 'key'    => 'M'
3229                         ) : false,
3230                         $wgUseTeX ? array(
3231                                 'image'  => $wgLang->getImageFile( 'button-math' ),
3232                                 'id'     => 'mw-editbutton-math',
3233                                 'open'   => "<math>",
3234                                 'close'  => "</math>",
3235                                 'sample' => wfMessage( 'math_sample' )->text(),
3236                                 'tip'    => wfMessage( 'math_tip' )->text(),
3237                                 'key'    => 'C'
3238                         ) : false,
3239                         array(
3240                                 'image'  => $wgLang->getImageFile( 'button-nowiki' ),
3241                                 'id'     => 'mw-editbutton-nowiki',
3242                                 'open'   => "<nowiki>",
3243                                 'close'  => "</nowiki>",
3244                                 'sample' => wfMessage( 'nowiki_sample' )->text(),
3245                                 'tip'    => wfMessage( 'nowiki_tip' )->text(),
3246                                 'key'    => 'N'
3247                         ),
3248                         array(
3249                                 'image'  => $wgLang->getImageFile( 'button-sig' ),
3250                                 'id'     => 'mw-editbutton-signature',
3251                                 'open'   => '--~~~~',
3252                                 'close'  => '',
3253                                 'sample' => '',
3254                                 'tip'    => wfMessage( 'sig_tip' )->text(),
3255                                 'key'    => 'Y'
3256                         ),
3257                         array(
3258                                 'image'  => $wgLang->getImageFile( 'button-hr' ),
3259                                 'id'     => 'mw-editbutton-hr',
3260                                 'open'   => "\n----\n",
3261                                 'close'  => '',
3262                                 'sample' => '',
3263                                 'tip'    => wfMessage( 'hr_tip' )->text(),
3264                                 'key'    => 'R'
3265                         )
3266                 );
3267
3268                 $script = 'mw.loader.using("mediawiki.action.edit", function() {';
3269                 foreach ( $toolarray as $tool ) {
3270                         if ( !$tool ) {
3271                                 continue;
3272                         }
3273
3274                         $params = array(
3275                                 $image = $wgStylePath . '/common/images/' . $tool['image'],
3276                                 // Note that we use the tip both for the ALT tag and the TITLE tag of the image.
3277                                 // Older browsers show a "speedtip" type message only for ALT.
3278                                 // Ideally these should be different, realistically they
3279                                 // probably don't need to be.
3280                                 $tip = $tool['tip'],
3281                                 $open = $tool['open'],
3282                                 $close = $tool['close'],
3283                                 $sample = $tool['sample'],
3284                                 $cssId = $tool['id'],
3285                         );
3286
3287                         $script .= Xml::encodeJsCall( 'mw.toolbar.addButton', $params );
3288                 }
3289
3290                 // This used to be called on DOMReady from mediawiki.action.edit, which
3291                 // ended up causing race conditions with the setup code above.
3292                 $script .= "\n" .
3293                         "// Create button bar\n" .
3294                         "$(function() { mw.toolbar.init(); } );\n";
3295
3296                 $script .= '});';
3297                 $wgOut->addScript( Html::inlineScript( ResourceLoader::makeLoaderConditionalScript( $script ) ) );
3298
3299                 $toolbar = '<div id="toolbar"></div>';
3300
3301                 wfRunHooks( 'EditPageBeforeEditToolbar', array( &$toolbar ) );
3302
3303                 return $toolbar;
3304         }
3305
3306         /**
3307          * Returns an array of html code of the following checkboxes:
3308          * minor and watch
3309          *
3310          * @param int $tabindex Current tabindex
3311          * @param array $checked of checkbox => bool, where bool indicates the checked
3312          *                 status of the checkbox
3313          *
3314          * @return array
3315          */
3316         public function getCheckboxes( &$tabindex, $checked ) {
3317                 global $wgUser;
3318
3319                 $checkboxes = array();
3320
3321                 // don't show the minor edit checkbox if it's a new page or section
3322                 if ( !$this->isNew ) {
3323                         $checkboxes['minor'] = '';
3324                         $minorLabel = wfMessage( 'minoredit' )->parse();
3325                         if ( $wgUser->isAllowed( 'minoredit' ) ) {
3326                                 $attribs = array(
3327                                         'tabindex' => ++$tabindex,
3328                                         'accesskey' => wfMessage( 'accesskey-minoredit' )->text(),
3329                                         'id' => 'wpMinoredit',
3330                                 );
3331                                 $checkboxes['minor'] =
3332                                         Xml::check( 'wpMinoredit', $checked['minor'], $attribs ) .
3333                                         "&#160;<label for='wpMinoredit' id='mw-editpage-minoredit'" .
3334                                         Xml::expandAttributes( array( 'title' => Linker::titleAttrib( 'minoredit', 'withaccess' ) ) ) .
3335                                         ">{$minorLabel}</label>";
3336                         }
3337                 }
3338
3339                 $watchLabel = wfMessage( 'watchthis' )->parse();
3340                 $checkboxes['watch'] = '';
3341                 if ( $wgUser->isLoggedIn() ) {
3342                         $attribs = array(
3343                                 'tabindex' => ++$tabindex,
3344                                 'accesskey' => wfMessage( 'accesskey-watch' )->text(),
3345                                 'id' => 'wpWatchthis',
3346                         );
3347                         $checkboxes['watch'] =
3348                                 Xml::check( 'wpWatchthis', $checked['watch'], $attribs ) .
3349                                 "&#160;<label for='wpWatchthis' id='mw-editpage-watch'" .
3350                                 Xml::expandAttributes( array( 'title' => Linker::titleAttrib( 'watch', 'withaccess' ) ) ) .
3351                                 ">{$watchLabel}</label>";
3352                 }
3353                 wfRunHooks( 'EditPageBeforeEditChecks', array( &$this, &$checkboxes, &$tabindex ) );
3354                 return $checkboxes;
3355         }
3356
3357         /**
3358          * Returns an array of html code of the following buttons:
3359          * save, diff, preview and live
3360          *
3361          * @param int $tabindex Current tabindex
3362          *
3363          * @return array
3364          */
3365         public function getEditButtons( &$tabindex ) {
3366                 $buttons = array();
3367
3368                 $temp = array(
3369                         'id' => 'wpSave',
3370                         'name' => 'wpSave',
3371                         'type' => 'submit',
3372                         'tabindex' => ++$tabindex,
3373                         'value' => wfMessage( 'savearticle' )->text(),
3374                         'accesskey' => wfMessage( 'accesskey-save' )->text(),
3375                         'title' => wfMessage( 'tooltip-save' )->text() . ' [' . wfMessage( 'accesskey-save' )->text() . ']',
3376                 );
3377                 $buttons['save'] = Xml::element( 'input', $temp, '' );
3378
3379                 ++$tabindex; // use the same for preview and live preview
3380                 $temp = array(
3381                         'id' => 'wpPreview',
3382                         'name' => 'wpPreview',
3383                         'type' => 'submit',
3384                         'tabindex' => $tabindex,
3385                         'value' => wfMessage( 'showpreview' )->text(),
3386                         'accesskey' => wfMessage( 'accesskey-preview' )->text(),
3387                         'title' => wfMessage( 'tooltip-preview' )->text() . ' [' . wfMessage( 'accesskey-preview' )->text() . ']',
3388                 );
3389                 $buttons['preview'] = Xml::element( 'input', $temp, '' );
3390                 $buttons['live'] = '';
3391
3392                 $temp = array(
3393                         'id' => 'wpDiff',
3394                         'name' => 'wpDiff',
3395                         'type' => 'submit',
3396                         'tabindex' => ++$tabindex,
3397                         'value' => wfMessage( 'showdiff' )->text(),
3398                         'accesskey' => wfMessage( 'accesskey-diff' )->text(),
3399                         'title' => wfMessage( 'tooltip-diff' )->text() . ' [' . wfMessage( 'accesskey-diff' )->text() . ']',
3400                 );
3401                 $buttons['diff'] = Xml::element( 'input', $temp, '' );
3402
3403                 wfRunHooks( 'EditPageBeforeEditButtons', array( &$this, &$buttons, &$tabindex ) );
3404                 return $buttons;
3405         }
3406
3407         /**
3408          * Output preview text only. This can be sucked into the edit page
3409          * via JavaScript, and saves the server time rendering the skin as
3410          * well as theoretically being more robust on the client (doesn't
3411          * disturb the edit box's undo history, won't eat your text on
3412          * failure, etc).
3413          *
3414          * @todo This doesn't include category or interlanguage links.
3415          *       Would need to enhance it a bit, "<s>maybe wrap them in XML
3416          *       or something...</s>" that might also require more skin
3417          *       initialization, so check whether that's a problem.
3418          */
3419         function livePreview() {
3420                 global $wgOut;
3421                 $wgOut->disable();
3422                 header( 'Content-type: text/xml; charset=utf-8' );
3423                 header( 'Cache-control: no-cache' );
3424
3425                 $previewText = $this->getPreviewText();
3426                 #$categories = $skin->getCategoryLinks();
3427
3428                 $s =
3429                 '<?xml version="1.0" encoding="UTF-8" ?>' . "\n" .
3430                 Xml::tags( 'livepreview', null,
3431                         Xml::element( 'preview', null, $previewText )
3432                         #.      Xml::element( 'category', null, $categories )
3433                 );
3434                 echo $s;
3435         }
3436
3437         /**
3438          * Call the stock "user is blocked" page
3439          *
3440          * @deprecated in 1.19; throw an exception directly instead
3441          */
3442         function blockedPage() {
3443                 wfDeprecated( __METHOD__, '1.19' );
3444                 global $wgUser;
3445
3446                 throw new UserBlockedError( $wgUser->getBlock() );
3447         }
3448
3449         /**
3450          * Produce the stock "please login to edit pages" page
3451          *
3452          * @deprecated in 1.19; throw an exception directly instead
3453          */
3454         function userNotLoggedInPage() {
3455                 wfDeprecated( __METHOD__, '1.19' );
3456                 throw new PermissionsError( 'edit' );
3457         }
3458
3459         /**
3460          * Show an error page saying to the user that he has insufficient permissions
3461          * to create a new page
3462          *
3463          * @deprecated in 1.19; throw an exception directly instead
3464          */
3465         function noCreatePermission() {
3466                 wfDeprecated( __METHOD__, '1.19' );
3467                 $permission = $this->mTitle->isTalkPage() ? 'createtalk' : 'createpage';
3468                 throw new PermissionsError( $permission );
3469         }
3470
3471         /**
3472          * Creates a basic error page which informs the user that
3473          * they have attempted to edit a nonexistent section.
3474          */
3475         function noSuchSectionPage() {
3476                 global $wgOut;
3477
3478                 $wgOut->prepareErrorPage( wfMessage( 'nosuchsectiontitle' ) );
3479
3480                 $res = wfMessage( 'nosuchsectiontext', $this->section )->parseAsBlock();
3481                 wfRunHooks( 'EditPageNoSuchSection', array( &$this, &$res ) );
3482                 $wgOut->addHTML( $res );
3483
3484                 $wgOut->returnToMain( false, $this->mTitle );
3485         }
3486
3487         /**
3488          * Produce the stock "your edit contains spam" page
3489          *
3490          * @param string|bool $match Text which triggered one or more filters
3491          * @deprecated since 1.17 Use method spamPageWithContent() instead
3492          */
3493         static function spamPage( $match = false ) {
3494                 wfDeprecated( __METHOD__, '1.17' );
3495
3496                 global $wgOut, $wgTitle;
3497
3498                 $wgOut->prepareErrorPage( wfMessage( 'spamprotectiontitle' ) );
3499
3500                 $wgOut->addHTML( '<div id="spamprotected">' );
3501                 $wgOut->addWikiMsg( 'spamprotectiontext' );
3502                 if ( $match ) {
3503                         $wgOut->addWikiMsg( 'spamprotectionmatch', wfEscapeWikiText( $match ) );
3504                 }
3505                 $wgOut->addHTML( '</div>' );
3506
3507                 $wgOut->returnToMain( false, $wgTitle );
3508         }
3509
3510         /**
3511          * Show "your edit contains spam" page with your diff and text
3512          *
3513          * @param $match string|Array|bool Text (or array of texts) which triggered one or more filters
3514          */
3515         public function spamPageWithContent( $match = false ) {
3516                 global $wgOut, $wgLang;
3517                 $this->textbox2 = $this->textbox1;
3518
3519                 if ( is_array( $match ) ) {
3520                         $match = $wgLang->listToText( $match );
3521                 }
3522                 $wgOut->prepareErrorPage( wfMessage( 'spamprotectiontitle' ) );
3523
3524                 $wgOut->addHTML( '<div id="spamprotected">' );
3525                 $wgOut->addWikiMsg( 'spamprotectiontext' );
3526                 if ( $match ) {
3527                         $wgOut->addWikiMsg( 'spamprotectionmatch', wfEscapeWikiText( $match ) );
3528                 }
3529                 $wgOut->addHTML( '</div>' );
3530
3531                 $wgOut->wrapWikiMsg( '<h2>$1</h2>', "yourdiff" );
3532                 $this->showDiff();
3533
3534                 $wgOut->wrapWikiMsg( '<h2>$1</h2>', "yourtext" );
3535                 $this->showTextbox2();
3536
3537                 $wgOut->addReturnTo( $this->getContextTitle(), array( 'action' => 'edit' ) );
3538         }
3539
3540         /**
3541          * Format an anchor fragment as it would appear for a given section name
3542          * @param $text String
3543          * @return String
3544          * @private
3545          */
3546         function sectionAnchor( $text ) {
3547                 global $wgParser;
3548                 return $wgParser->guessSectionNameFromWikiText( $text );
3549         }
3550
3551         /**
3552          * Check if the browser is on a blacklist of user-agents known to
3553          * mangle UTF-8 data on form submission. Returns true if Unicode
3554          * should make it through, false if it's known to be a problem.
3555          * @return bool
3556          * @private
3557          */
3558         function checkUnicodeCompliantBrowser() {
3559                 global $wgBrowserBlackList, $wgRequest;
3560
3561                 $currentbrowser = $wgRequest->getHeader( 'User-Agent' );
3562                 if ( $currentbrowser === false ) {
3563                         // No User-Agent header sent? Trust it by default...
3564                         return true;
3565                 }
3566
3567                 foreach ( $wgBrowserBlackList as $browser ) {
3568                         if ( preg_match( $browser, $currentbrowser ) ) {
3569                                 return false;
3570                         }
3571                 }
3572                 return true;
3573         }
3574
3575         /**
3576          * Filter an input field through a Unicode de-armoring process if it
3577          * came from an old browser with known broken Unicode editing issues.
3578          *
3579          * @param $request WebRequest
3580          * @param $field String
3581          * @return String
3582          * @private
3583          */
3584         function safeUnicodeInput( $request, $field ) {
3585                 $text = rtrim( $request->getText( $field ) );
3586                 return $request->getBool( 'safemode' )
3587                         ? $this->unmakesafe( $text )
3588                         : $text;
3589         }
3590
3591         /**
3592          * @param $request WebRequest
3593          * @param $text string
3594          * @return string
3595          */
3596         function safeUnicodeText( $request, $text ) {
3597                 $text = rtrim( $text );
3598                 return $request->getBool( 'safemode' )
3599                         ? $this->unmakesafe( $text )
3600                         : $text;
3601         }
3602
3603         /**
3604          * Filter an output field through a Unicode armoring process if it is
3605          * going to an old browser with known broken Unicode editing issues.
3606          *
3607          * @param $text String
3608          * @return String
3609          * @private
3610          */
3611         function safeUnicodeOutput( $text ) {
3612                 global $wgContLang;
3613                 $codedText = $wgContLang->recodeForEdit( $text );
3614                 return $this->checkUnicodeCompliantBrowser()
3615                         ? $codedText
3616                         : $this->makesafe( $codedText );
3617         }
3618
3619         /**
3620          * A number of web browsers are known to corrupt non-ASCII characters
3621          * in a UTF-8 text editing environment. To protect against this,
3622          * detected browsers will be served an armored version of the text,
3623          * with non-ASCII chars converted to numeric HTML character references.
3624          *
3625          * Preexisting such character references will have a 0 added to them
3626          * to ensure that round-trips do not alter the original data.
3627          *
3628          * @param $invalue String
3629          * @return String
3630          * @private
3631          */
3632         function makesafe( $invalue ) {
3633                 // Armor existing references for reversibility.
3634                 $invalue = strtr( $invalue, array( "&#x" => "&#x0" ) );
3635
3636                 $bytesleft = 0;
3637                 $result = "";
3638                 $working = 0;
3639                 for ( $i = 0; $i < strlen( $invalue ); $i++ ) {
3640                         $bytevalue = ord( $invalue[$i] );
3641                         if ( $bytevalue <= 0x7F ) { // 0xxx xxxx
3642                                 $result .= chr( $bytevalue );
3643                                 $bytesleft = 0;
3644                         } elseif ( $bytevalue <= 0xBF ) { // 10xx xxxx
3645                                 $working = $working << 6;
3646                                 $working += ( $bytevalue & 0x3F );
3647                                 $bytesleft--;
3648                                 if ( $bytesleft <= 0 ) {
3649                                         $result .= "&#x" . strtoupper( dechex( $working ) ) . ";";
3650                                 }
3651                         } elseif ( $bytevalue <= 0xDF ) { // 110x xxxx
3652                                 $working = $bytevalue & 0x1F;
3653                                 $bytesleft = 1;
3654                         } elseif ( $bytevalue <= 0xEF ) { // 1110 xxxx
3655                                 $working = $bytevalue & 0x0F;
3656                                 $bytesleft = 2;
3657                         } else { // 1111 0xxx
3658                                 $working = $bytevalue & 0x07;
3659                                 $bytesleft = 3;
3660                         }
3661                 }
3662                 return $result;
3663         }
3664
3665         /**
3666          * Reverse the previously applied transliteration of non-ASCII characters
3667          * back to UTF-8. Used to protect data from corruption by broken web browsers
3668          * as listed in $wgBrowserBlackList.
3669          *
3670          * @param $invalue String
3671          * @return String
3672          * @private
3673          */
3674         function unmakesafe( $invalue ) {
3675                 $result = "";
3676                 for ( $i = 0; $i < strlen( $invalue ); $i++ ) {
3677                         if ( ( substr( $invalue, $i, 3 ) == "&#x" ) && ( $invalue[$i + 3] != '0' ) ) {
3678                                 $i += 3;
3679                                 $hexstring = "";
3680                                 do {
3681                                         $hexstring .= $invalue[$i];
3682                                         $i++;
3683                                 } while ( ctype_xdigit( $invalue[$i] ) && ( $i < strlen( $invalue ) ) );
3684
3685                                 // Do some sanity checks. These aren't needed for reversibility,
3686                                 // but should help keep the breakage down if the editor
3687                                 // breaks one of the entities whilst editing.
3688                                 if ( ( substr( $invalue, $i, 1 ) == ";" ) and ( strlen( $hexstring ) <= 6 ) ) {
3689                                         $codepoint = hexdec( $hexstring );
3690                                         $result .= codepointToUtf8( $codepoint );
3691                                 } else {
3692                                         $result .= "&#x" . $hexstring . substr( $invalue, $i, 1 );
3693                                 }
3694                         } else {
3695                                 $result .= substr( $invalue, $i, 1 );
3696                         }
3697                 }
3698                 // reverse the transform that we made for reversibility reasons.
3699                 return strtr( $result, array( "&#x0" => "&#x" ) );
3700         }
3701 }