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 ) $content = $def_content;
 902                         } else {
 903                                 $undoafter = $wgRequest->getInt( 'undoafter' );
 904                                 $undo = $wgRequest->getInt( 'undo' );
 905
 906                                 if ( $undo > 0 && $undoafter > 0 ) {
 907                                         if ( $undo < $undoafter ) {
 908                                                 # If they got undoafter and undo round the wrong way, switch them
 909                                                 list( $undo, $undoafter ) = array( $undoafter, $undo );
 910                                         }
 911
 912                                         $undorev = Revision::newFromId( $undo );
 913                                         $oldrev = Revision::newFromId( $undoafter );
 914
 915                                         # Sanity check, make sure it's the right page,
 916                                         # the revisions exist and they were not deleted.
 917                                         # Otherwise, $content will be left as-is.
 918                                         if ( !is_null( $undorev ) && !is_null( $oldrev ) &&
 919                                                 $undorev->getPage() == $oldrev->getPage() &&
 920                                                 $undorev->getPage() == $this->mTitle->getArticleID() &&
 921                                                 !$undorev->isDeleted( Revision::DELETED_TEXT ) &&
 922                                                 !$oldrev->isDeleted( Revision::DELETED_TEXT ) ) {
 923
 924                                                 $content = $this->mArticle->getUndoContent( $undorev, $oldrev );
 925
 926                                                 if ( $content === false ) {
 927                                                         # Warn the user that something went wrong
 928                                                         $undoMsg = 'failure';
 929                                                 } else {
 930                                                         # Inform the user of our success and set an automatic edit summary
 931                                                         $undoMsg = 'success';
 932
 933                                                         # If we just undid one rev, use an autosummary
 934                                                         $firstrev = $oldrev->getNext();
 935                                                         if ( $firstrev && $firstrev->getId() == $undo ) {
 936                                                                 $undoSummary = wfMessage( 'undo-summary', $undo, $undorev->getUserText() )->inContentLanguage()->text();
 937                                                                 if ( $this->summary === '' ) {
 938                                                                         $this->summary = $undoSummary;
 939                                                                 } else {
 940                                                                         $this->summary = $undoSummary . wfMessage( 'colon-separator' )
 941                                                                                 ->inContentLanguage()->text() . $this->summary;
 942                                                                 }
 943                                                                 $this->undidRev = $undo;
 944                                                         }
 945                                                         $this->formtype = 'diff';
 946                                                 }
 947                                         } else {
 948                                                 // Failed basic sanity checks.
 949                                                 // Older revisions may have been removed since the link
 950                                                 // was created, or we may simply have got bogus input.
 951                                                 $undoMsg = 'norev';
 952                                         }
 953
 954                                         $class = ( $undoMsg == 'success' ? '' : 'error ' ) . "mw-undo-{$undoMsg}";
 955                                         $this->editFormPageTop .= $wgOut->parse( "<div class=\"{$class}\">" .
 956                                                 wfMessage( 'undo-' . $undoMsg )->plain() . '</div>', true, /* interface */true );
 957                                 }
 958
 959                                 if ( $content === false ) {
 960                                         $content = $this->getOriginalContent();
 961                                 }
 962                         }
 963                 }
 964
 965                 wfProfileOut( __METHOD__ );
 966                 return $content;
 967         }
 968
 969         /**
 970          * Get the content of the wanted revision, without section extraction.
 971          *
 972          * The result of this function can be used to compare user's input with
 973          * section replaced in its context (using WikiPage::replaceSection())
 974          * to the original text of the edit.
 975          *
 976          * This differs from Article::getContent() that when a missing revision is
 977          * encountered the result will be null and not the
 978          * 'missing-revision' message.
 979          *
 980          * @since 1.19
 981          * @return Content|null
 982          */
 983         private function getOriginalContent() {
 984                 if ( $this->section == 'new' ) {
 985                         return $this->getCurrentContent();
 986                 }
 987                 $revision = $this->mArticle->getRevisionFetched();
 988                 if ( $revision === null ) {
 989                         if ( !$this->contentModel ) $this->contentModel = $this->getTitle()->getContentModel();
 990                         $handler = ContentHandler::getForModelID( $this->contentModel );
 991
 992                         return $handler->makeEmptyContent();
 993                 }
 994                 $content = $revision->getContent();
 995                 return $content;
 996         }
 997
 998         /**
 999          * Get the current content of the page. This is basically similar to
1000          * WikiPage::getContent( Revision::RAW ) except that when the page doesn't exist an empty
1001          * content object is returned instead of null.
1002          *
1003          * @since 1.21
1004          * @return Content
1005          */
1006         protected function getCurrentContent() {
1007                 $rev = $this->mArticle->getRevision();
1008                 $content = $rev ? $rev->getContent( Revision::RAW ) : null;
1009
1010                 if ( $content === false || $content === null ) {
1011                         if ( !$this->contentModel ) $this->contentModel = $this->getTitle()->getContentModel();
1012                         $handler = ContentHandler::getForModelID( $this->contentModel );
1013
1014                         return $handler->makeEmptyContent();
1015                 } else {
1016                         # nasty side-effect, but needed for consistency
1017                         $this->contentModel = $rev->getContentModel();
1018                         $this->contentFormat = $rev->getContentFormat();
1019
1020                         return $content;
1021                 }
1022         }
1023
1024         /**
1025          * Use this method before edit() to preload some text into the edit box
1026          *
1027          * @param $text string
1028          * @deprecated since 1.21, use setPreloadedContent() instead.
1029          */
1030         public function setPreloadedText( $text ) {
1031                 ContentHandler::deprecated( __METHOD__, "1.21" );
1032
1033                 $content = $this->toEditContent( $text );
1034
1035                 $this->setPreloadedContent( $content );
1036         }
1037
1038         /**
1039          * Use this method before edit() to preload some content into the edit box
1040          *
1041          * @param $content Content
1042          *
1043          * @since 1.21
1044          */
1045         public function setPreloadedContent( Content $content ) {
1046                 $this->mPreloadContent = $content;
1047         }
1048
1049         /**
1050          * Get the contents to be preloaded into the box, either set by
1051          * an earlier setPreloadText() or by loading the given page.
1052          *
1053          * @param string $preload representing the title to preload from.
1054          *
1055          * @return String
1056          *
1057          * @deprecated since 1.21, use getPreloadedContent() instead
1058          */
1059         protected function getPreloadedText( $preload ) {
1060                 ContentHandler::deprecated( __METHOD__, "1.21" );
1061
1062                 $content = $this->getPreloadedContent( $preload );
1063                 $text = $this->toEditText( $content );
1064
1065                 return $text;
1066         }
1067
1068         /**
1069          * Get the contents to be preloaded into the box, either set by
1070          * an earlier setPreloadText() or by loading the given page.
1071          *
1072          * @param string $preload representing the title to preload from.
1073          *
1074          * @return Content
1075          *
1076          * @since 1.21
1077          */
1078         protected function getPreloadedContent( $preload ) {
1079                 global $wgUser;
1080
1081                 if ( !empty( $this->mPreloadContent ) ) {
1082                         return $this->mPreloadContent;
1083                 }
1084
1085                 $handler = ContentHandler::getForTitle( $this->getTitle() );
1086
1087                 if ( $preload === '' ) {
1088                         return $handler->makeEmptyContent();
1089                 }
1090
1091                 $title = Title::newFromText( $preload );
1092                 # Check for existence to avoid getting MediaWiki:Noarticletext
1093                 if ( $title === null || !$title->exists() || !$title->userCan( 'read', $wgUser ) ) {
1094                         //TODO: somehow show a warning to the user!
1095                         return $handler->makeEmptyContent();
1096                 }
1097
1098                 $page = WikiPage::factory( $title );
1099                 if ( $page->isRedirect() ) {
1100                         $title = $page->getRedirectTarget();
1101                         # Same as before
1102                         if ( $title === null || !$title->exists() || !$title->userCan( 'read', $wgUser ) ) {
1103                                 //TODO: somehow show a warning to the user!
1104                                 return $handler->makeEmptyContent();
1105                         }
1106                         $page = WikiPage::factory( $title );
1107                 }
1108
1109                 $parserOptions = ParserOptions::newFromUser( $wgUser );
1110                 $content = $page->getContent( Revision::RAW );
1111
1112                 if ( !$content ) {
1113                         //TODO: somehow show a warning to the user!
1114                         return $handler->makeEmptyContent();
1115                 }
1116
1117                 if ( $content->getModel() !== $handler->getModelID() ) {
1118                         $converted = $content->convert( $handler->getModelID() );
1119
1120                         if ( !$converted ) {
1121                                 //TODO: somehow show a warning to the user!
1122                                 wfDebug( "Attempt to preload incompatible content: "
1123                                                 . "can't convert " . $content->getModel()
1124                                                 . " to " . $handler->getModelID() );
1125
1126                                 return $handler->makeEmptyContent();
1127                         }
1128
1129                         $content = $converted;
1130                 }
1131
1132                 return $content->preloadTransform( $title, $parserOptions );
1133         }
1134
1135         /**
1136          * Make sure the form isn't faking a user's credentials.
1137          *
1138          * @param $request WebRequest
1139          * @return bool
1140          * @private
1141          */
1142         function tokenOk( &$request ) {
1143                 global $wgUser;
1144                 $token = $request->getVal( 'wpEditToken' );
1145                 $this->mTokenOk = $wgUser->matchEditToken( $token );
1146                 $this->mTokenOkExceptSuffix = $wgUser->matchEditTokenNoSuffix( $token );
1147                 return $this->mTokenOk;
1148         }
1149
1150         /**
1151          * Sets post-edit cookie indicating the user just saved a particular revision.
1152          *
1153          * This uses a temporary cookie for each revision ID so separate saves will never
1154          * interfere with each other.
1155          *
1156          * The cookie is deleted in the mediawiki.action.view.postEdit JS module after
1157          * the redirect.  It must be clearable by JavaScript code, so it must not be
1158          * marked HttpOnly. The JavaScript code converts the cookie to a wgPostEdit config
1159          * variable.
1160          *
1161          * Since WebResponse::setcookie does not allow forcing HttpOnly for a single
1162          * cookie, we have to use PHP's setcookie() directly.
1163          *
1164          * We use a path of '/' since wgCookiePath is not exposed to JS
1165          *
1166          * If the variable were set on the server, it would be cached, which is unwanted
1167          * since the post-edit state should only apply to the load right after the save.
1168          */
1169         protected function setPostEditCookie() {
1170                 global $wgCookiePrefix, $wgCookieDomain;
1171                 $revisionId = $this->mArticle->getLatest();
1172                 $postEditKey = self::POST_EDIT_COOKIE_KEY_PREFIX . $revisionId;
1173
1174                 setcookie( $wgCookiePrefix . $postEditKey, '1', time() + self::POST_EDIT_COOKIE_DURATION, '/', $wgCookieDomain );
1175         }
1176
1177         /**
1178          * Attempt submission
1179          * @throws UserBlockedError|ReadOnlyError|ThrottledError|PermissionsError
1180          * @return bool false if output is done, true if the rest of the form should be displayed
1181          */
1182         function attemptSave() {
1183                 global $wgUser, $wgOut;
1184
1185                 $resultDetails = false;
1186                 # Allow bots to exempt some edits from bot flagging
1187                 $bot = $wgUser->isAllowed( 'bot' ) && $this->bot;
1188                 $status = $this->internalAttemptSave( $resultDetails, $bot );
1189                 // FIXME: once the interface for internalAttemptSave() is made nicer, this should use the message in $status
1190                 if ( $status->value == self::AS_SUCCESS_UPDATE || $status->value == self::AS_SUCCESS_NEW_ARTICLE ) {
1191                         $this->didSave = true;
1192                         if ( !$resultDetails['nullEdit'] ) {
1193                                 $this->setPostEditCookie();
1194                         }
1195                 }
1196
1197                 switch ( $status->value ) {
1198                         case self::AS_HOOK_ERROR_EXPECTED:
1199                         case self::AS_CONTENT_TOO_BIG:
1200                         case self::AS_ARTICLE_WAS_DELETED:
1201                         case self::AS_CONFLICT_DETECTED:
1202                         case self::AS_SUMMARY_NEEDED:
1203                         case self::AS_TEXTBOX_EMPTY:
1204                         case self::AS_MAX_ARTICLE_SIZE_EXCEEDED:
1205                         case self::AS_END:
1206                                 return true;
1207
1208                         case self::AS_HOOK_ERROR:
1209                                 return false;
1210
1211                         case self::AS_PARSE_ERROR:
1212                                 $wgOut->addWikiText( '<div class="error">' . $status->getWikiText() . '</div>' );
1213                                 return true;
1214
1215                         case self::AS_SUCCESS_NEW_ARTICLE:
1216                                 $query = $resultDetails['redirect'] ? 'redirect=no' : '';
1217                                 $anchor = isset ( $resultDetails['sectionanchor'] ) ? $resultDetails['sectionanchor'] : '';
1218                                 $wgOut->redirect( $this->mTitle->getFullURL( $query ) . $anchor );
1219                                 return false;
1220
1221                         case self::AS_SUCCESS_UPDATE:
1222                                 $extraQuery = '';
1223                                 $sectionanchor = $resultDetails['sectionanchor'];
1224
1225                                 // Give extensions a chance to modify URL query on update
1226                                 wfRunHooks( 'ArticleUpdateBeforeRedirect', array( $this->mArticle, &$sectionanchor, &$extraQuery ) );
1227
1228                                 if ( $resultDetails['redirect'] ) {
1229                                         if ( $extraQuery == '' ) {
1230                                                 $extraQuery = 'redirect=no';
1231                                         } else {
1232                                                 $extraQuery = 'redirect=no&' . $extraQuery;
1233                                         }
1234                                 }
1235                                 $wgOut->redirect( $this->mTitle->getFullURL( $extraQuery ) . $sectionanchor );
1236                                 return false;
1237
1238                         case self::AS_BLANK_ARTICLE:
1239                                 $wgOut->redirect( $this->getContextTitle()->getFullURL() );
1240                                 return false;
1241
1242                         case self::AS_SPAM_ERROR:
1243                                 $this->spamPageWithContent( $resultDetails['spam'] );
1244                                 return false;
1245
1246                         case self::AS_BLOCKED_PAGE_FOR_USER:
1247                                 throw new UserBlockedError( $wgUser->getBlock() );
1248
1249                         case self::AS_IMAGE_REDIRECT_ANON:
1250                         case self::AS_IMAGE_REDIRECT_LOGGED:
1251                                 throw new PermissionsError( 'upload' );
1252
1253                         case self::AS_READ_ONLY_PAGE_ANON:
1254                         case self::AS_READ_ONLY_PAGE_LOGGED:
1255                                 throw new PermissionsError( 'edit' );
1256
1257                         case self::AS_READ_ONLY_PAGE:
1258                                 throw new ReadOnlyError;
1259
1260                         case self::AS_RATE_LIMITED:
1261                                 throw new ThrottledError();
1262
1263                         case self::AS_NO_CREATE_PERMISSION:
1264                                 $permission = $this->mTitle->isTalkPage() ? 'createtalk' : 'createpage';
1265                                 throw new PermissionsError( $permission );
1266
1267                         default:
1268                                 // We don't recognize $status->value. The only way that can happen
1269                                 // is if an extension hook aborted from inside ArticleSave.
1270                                 // Render the status object into $this->hookError
1271                                 // FIXME this sucks, we should just use the Status object throughout
1272                                 $this->hookError = '<div class="error">' . $status->getWikitext() .
1273                                         '</div>';
1274                                 return true;
1275                 }
1276         }
1277
1278         /**
1279          * Run hooks that can filter edits just before they get saved.
1280          *
1281          * @param Content $content the Content to filter.
1282          * @param Status  $status for reporting the outcome to the caller
1283          * @param User    $user the user performing the edit
1284          *
1285          * @return bool
1286          */
1287         protected function runPostMergeFilters( Content $content, Status $status, User $user ) {
1288                 // Run old style post-section-merge edit filter
1289                 if ( !ContentHandler::runLegacyHooks( 'EditFilterMerged',
1290                         array( $this, $content, &$this->hookError, $this->summary ) ) ) {
1291
1292                         # Error messages etc. could be handled within the hook...
1293                         $status->fatal( 'hookaborted' );
1294                         $status->value = self::AS_HOOK_ERROR;
1295                         return false;
1296                 } elseif ( $this->hookError != '' ) {
1297                         # ...or the hook could be expecting us to produce an error
1298                         $status->fatal( 'hookaborted' );
1299                         $status->value = self::AS_HOOK_ERROR_EXPECTED;
1300                         return false;
1301                 }
1302
1303                 // Run new style post-section-merge edit filter
1304                 if ( !wfRunHooks( 'EditFilterMergedContent',
1305                         array( $this->mArticle->getContext(), $content, $status, $this->summary,
1306                                 $user, $this->minoredit ) ) ) {
1307
1308                         # Error messages etc. could be handled within the hook...
1309                         // XXX: $status->value may already be something informative...
1310                         $this->hookError = $status->getWikiText();
1311                         $status->fatal( 'hookaborted' );
1312                         $status->value = self::AS_HOOK_ERROR;
1313                         return false;
1314                 } elseif ( !$status->isOK() ) {
1315                         # ...or the hook could be expecting us to produce an error
1316                         // FIXME this sucks, we should just use the Status object throughout
1317                         $this->hookError = $status->getWikiText();
1318                         $status->fatal( 'hookaborted' );
1319                         $status->value = self::AS_HOOK_ERROR_EXPECTED;
1320                         return false;
1321                 }
1322
1323                 return true;
1324         }
1325
1326         /**
1327          * Attempt submission (no UI)
1328          *
1329          * @param array $result array to add statuses to, currently with the possible keys:
1330          *  spam - string - Spam string from content if any spam is detected by matchSpamRegex
1331          *  sectionanchor - string - Section anchor for a section save
1332          *  nullEdit - boolean - Set if doEditContent is OK.  True if null edit, false otherwise.
1333          *  redirect - boolean -  Set if doEditContent is OK.  True if resulting revision is a redirect
1334          * @param bool $bot True if edit is being made under the bot right.
1335          *
1336          * @return Status object, possibly with a message, but always with one of the AS_* constants in $status->value,
1337          *
1338          * FIXME: This interface is TERRIBLE, but hard to get rid of due to various error display idiosyncrasies. There are
1339          * also lots of cases where error metadata is set in the object and retrieved later instead of being returned, e.g.
1340          * AS_CONTENT_TOO_BIG and AS_BLOCKED_PAGE_FOR_USER. All that stuff needs to be cleaned up some time.
1341          */
1342         function internalAttemptSave( &$result, $bot = false ) {
1343                 global $wgUser, $wgRequest, $wgParser, $wgMaxArticleSize;
1344
1345                 $status = Status::newGood();
1346
1347                 wfProfileIn( __METHOD__ );
1348                 wfProfileIn( __METHOD__ . '-checks' );
1349
1350                 if ( !wfRunHooks( 'EditPage::attemptSave', array( $this ) ) ) {
1351                         wfDebug( "Hook 'EditPage::attemptSave' aborted article saving\n" );
1352                         $status->fatal( 'hookaborted' );
1353                         $status->value = self::AS_HOOK_ERROR;
1354                         wfProfileOut( __METHOD__ . '-checks' );
1355                         wfProfileOut( __METHOD__ );
1356                         return $status;
1357                 }
1358
1359                 try {
1360                         # Construct Content object
1361                         $textbox_content = $this->toEditContent( $this->textbox1 );
1362                 } catch ( MWContentSerializationException $ex ) {
1363                         $status->fatal( 'content-failed-to-parse', $this->contentModel, $this->contentFormat, $ex->getMessage() );
1364                         $status->value = self::AS_PARSE_ERROR;
1365                         wfProfileOut( __METHOD__ . '-checks' );
1366                         wfProfileOut( __METHOD__ );
1367                         return $status;
1368                 }
1369
1370                 # Check image redirect
1371                 if ( $this->mTitle->getNamespace() == NS_FILE &&
1372                         $textbox_content->isRedirect() &&
1373                         !$wgUser->isAllowed( 'upload' ) ) {
1374                                 $code = $wgUser->isAnon() ? self::AS_IMAGE_REDIRECT_ANON : self::AS_IMAGE_REDIRECT_LOGGED;
1375                                 $status->setResult( false, $code );
1376
1377                                 wfProfileOut( __METHOD__ . '-checks' );
1378                                 wfProfileOut( __METHOD__ );
1379
1380                                 return $status;
1381                 }
1382
1383                 # Check for spam
1384                 $match = self::matchSummarySpamRegex( $this->summary );
1385                 if ( $match === false ) {
1386                         $match = self::matchSpamRegex( $this->textbox1 );
1387                 }
1388                 if ( $match !== false ) {
1389                         $result['spam'] = $match;
1390                         $ip = $wgRequest->getIP();
1391                         $pdbk = $this->mTitle->getPrefixedDBkey();
1392                         $match = str_replace( "\n", '', $match );
1393                         wfDebugLog( 'SpamRegex', "$ip spam regex hit [[$pdbk]]: \"$match\"" );
1394                         $status->fatal( 'spamprotectionmatch', $match );
1395                         $status->value = self::AS_SPAM_ERROR;
1396                         wfProfileOut( __METHOD__ . '-checks' );
1397                         wfProfileOut( __METHOD__ );
1398                         return $status;
1399                 }
1400                 if ( !wfRunHooks( 'EditFilter', array( $this, $this->textbox1, $this->section, &$this->hookError, $this->summary ) ) ) {
1401                         # Error messages etc. could be handled within the hook...
1402                         $status->fatal( 'hookaborted' );
1403                         $status->value = self::AS_HOOK_ERROR;
1404                         wfProfileOut( __METHOD__ . '-checks' );
1405                         wfProfileOut( __METHOD__ );
1406                         return $status;
1407                 } elseif ( $this->hookError != '' ) {
1408                         # ...or the hook could be expecting us to produce an error
1409                         $status->fatal( 'hookaborted' );
1410                         $status->value = self::AS_HOOK_ERROR_EXPECTED;
1411                         wfProfileOut( __METHOD__ . '-checks' );
1412                         wfProfileOut( __METHOD__ );
1413                         return $status;
1414                 }
1415
1416                 if ( $wgUser->isBlockedFrom( $this->mTitle, false ) ) {
1417                         // Auto-block user's IP if the account was "hard" blocked
1418                         $wgUser->spreadAnyEditBlock();
1419                         # Check block state against master, thus 'false'.
1420                         $status->setResult( false, self::AS_BLOCKED_PAGE_FOR_USER );
1421                         wfProfileOut( __METHOD__ . '-checks' );
1422                         wfProfileOut( __METHOD__ );
1423                         return $status;
1424                 }
1425
1426                 $this->kblength = (int)( strlen( $this->textbox1 ) / 1024 );
1427                 if ( $this->kblength > $wgMaxArticleSize ) {
1428                         // Error will be displayed by showEditForm()
1429                         $this->tooBig = true;
1430                         $status->setResult( false, self::AS_CONTENT_TOO_BIG );
1431                         wfProfileOut( __METHOD__ . '-checks' );
1432                         wfProfileOut( __METHOD__ );
1433                         return $status;
1434                 }
1435
1436                 if ( !$wgUser->isAllowed( 'edit' ) ) {
1437                         if ( $wgUser->isAnon() ) {
1438                                 $status->setResult( false, self::AS_READ_ONLY_PAGE_ANON );
1439                                 wfProfileOut( __METHOD__ . '-checks' );
1440                                 wfProfileOut( __METHOD__ );
1441                                 return $status;
1442                         } else {
1443                                 $status->fatal( 'readonlytext' );
1444                                 $status->value = self::AS_READ_ONLY_PAGE_LOGGED;
1445                                 wfProfileOut( __METHOD__ . '-checks' );
1446                                 wfProfileOut( __METHOD__ );
1447                                 return $status;
1448                         }
1449                 }
1450
1451                 if ( wfReadOnly() ) {
1452                         $status->fatal( 'readonlytext' );
1453                         $status->value = self::AS_READ_ONLY_PAGE;
1454                         wfProfileOut( __METHOD__ . '-checks' );
1455                         wfProfileOut( __METHOD__ );
1456                         return $status;
1457                 }
1458                 if ( $wgUser->pingLimiter() ) {
1459                         $status->fatal( 'actionthrottledtext' );
1460                         $status->value = self::AS_RATE_LIMITED;
1461                         wfProfileOut( __METHOD__ . '-checks' );
1462                         wfProfileOut( __METHOD__ );
1463                         return $status;
1464                 }
1465
1466                 # If the article has been deleted while editing, don't save it without
1467                 # confirmation
1468                 if ( $this->wasDeletedSinceLastEdit() && !$this->recreate ) {
1469                         $status->setResult( false, self::AS_ARTICLE_WAS_DELETED );
1470                         wfProfileOut( __METHOD__ . '-checks' );
1471                         wfProfileOut( __METHOD__ );
1472                         return $status;
1473                 }
1474
1475                 wfProfileOut( __METHOD__ . '-checks' );
1476
1477                 # Load the page data from the master. If anything changes in the meantime,
1478                 # we detect it by using page_latest like a token in a 1 try compare-and-swap.
1479                 $this->mArticle->loadPageData( 'fromdbmaster' );
1480                 $new = !$this->mArticle->exists();
1481
1482                 if ( $new ) {
1483                         // Late check for create permission, just in case *PARANOIA*
1484                         if ( !$this->mTitle->userCan( 'create', $wgUser ) ) {
1485                                 $status->fatal( 'nocreatetext' );
1486                                 $status->value = self::AS_NO_CREATE_PERMISSION;
1487                                 wfDebug( __METHOD__ . ": no create permission\n" );
1488                                 wfProfileOut( __METHOD__ );
1489                                 return $status;
1490                         }
1491
1492                         # Don't save a new article if it's blank.
1493                         if ( $this->textbox1 == '' ) {
1494                                 $status->setResult( false, self::AS_BLANK_ARTICLE );
1495                                 wfProfileOut( __METHOD__ );
1496                                 return $status;
1497                         }
1498
1499                         if ( !$this->runPostMergeFilters( $textbox_content, $status, $wgUser ) ) {
1500                                 wfProfileOut( __METHOD__ );
1501                                 return $status;
1502                         }
1503
1504                         $content = $textbox_content;
1505
1506                         $result['sectionanchor'] = '';
1507                         if ( $this->section == 'new' ) {
1508                                 if ( $this->sectiontitle !== '' ) {
1509                                         // Insert the section title above the content.
1510                                         $content = $content->addSectionHeader( $this->sectiontitle );
1511
1512                                         // Jump to the new section
1513                                         $result['sectionanchor'] = $wgParser->guessLegacySectionNameFromWikiText( $this->sectiontitle );
1514
1515                                         // If no edit summary was specified, create one automatically from the section
1516                                         // title and have it link to the new section. Otherwise, respect the summary as
1517                                         // passed.
1518                                         if ( $this->summary === '' ) {
1519                                                 $cleanSectionTitle = $wgParser->stripSectionName( $this->sectiontitle );
1520                                                 $this->summary = wfMessage( 'newsectionsummary' )
1521                                                         ->rawParams( $cleanSectionTitle )->inContentLanguage()->text();
1522                                         }
1523                                 } elseif ( $this->summary !== '' ) {
1524                                         // Insert the section title above the content.
1525                                         $content = $content->addSectionHeader( $this->summary );
1526
1527                                         // Jump to the new section
1528                                         $result['sectionanchor'] = $wgParser->guessLegacySectionNameFromWikiText( $this->summary );
1529
1530                                         // Create a link to the new section from the edit summary.
1531                                         $cleanSummary = $wgParser->stripSectionName( $this->summary );
1532                                         $this->summary = wfMessage( 'newsectionsummary' )
1533                                                 ->rawParams( $cleanSummary )->inContentLanguage()->text();
1534                                 }
1535                         }
1536
1537                         $status->value = self::AS_SUCCESS_NEW_ARTICLE;
1538
1539                 } else { # not $new
1540
1541                         # Article exists. Check for edit conflict.
1542
1543                         $this->mArticle->clear(); # Force reload of dates, etc.
1544                         $timestamp = $this->mArticle->getTimestamp();
1545
1546                         wfDebug( "timestamp: {$timestamp}, edittime: {$this->edittime}\n" );
1547
1548                         if ( $timestamp != $this->edittime ) {
1549                                 $this->isConflict = true;
1550                                 if ( $this->section == 'new' ) {
1551                                         if ( $this->mArticle->getUserText() == $wgUser->getName() &&
1552                                                 $this->mArticle->getComment() == $this->summary ) {
1553                                                 // Probably a duplicate submission of a new comment.
1554                                                 // This can happen when squid resends a request after
1555                                                 // a timeout but the first one actually went through.
1556                                                 wfDebug( __METHOD__ . ": duplicate new section submission; trigger edit conflict!\n" );
1557                                         } else {
1558                                                 // New comment; suppress conflict.
1559                                                 $this->isConflict = false;
1560                                                 wfDebug( __METHOD__ . ": conflict suppressed; new section\n" );
1561                                         }
1562                                 } elseif ( $this->section == '' && Revision::userWasLastToEdit( DB_MASTER, $this->mTitle->getArticleID(),
1563                                                         $wgUser->getId(), $this->edittime ) ) {
1564                                         # Suppress edit conflict with self, except for section edits where merging is required.
1565                                         wfDebug( __METHOD__ . ": Suppressing edit conflict, same user.\n" );
1566                                         $this->isConflict = false;
1567                                 }
1568                         }
1569
1570                         // If sectiontitle is set, use it, otherwise use the summary as the section title (for
1571                         // backwards compatibility with old forms/bots).
1572                         if ( $this->sectiontitle !== '' ) {
1573                                 $sectionTitle = $this->sectiontitle;
1574                         } else {
1575                                 $sectionTitle = $this->summary;
1576                         }
1577
1578                         $content = null;
1579
1580                         if ( $this->isConflict ) {
1581                                 wfDebug( __METHOD__ . ": conflict! getting section '{$this->section}' for time '{$this->edittime}'"
1582                                                 . " (article time '{$timestamp}')\n" );
1583
1584                                 $content = $this->mArticle->replaceSectionContent( $this->section, $textbox_content, $sectionTitle, $this->edittime );
1585                         } else {
1586                                 wfDebug( __METHOD__ . ": getting section '{$this->section}'\n" );
1587                                 $content = $this->mArticle->replaceSectionContent( $this->section, $textbox_content, $sectionTitle );
1588                         }
1589
1590                         if ( is_null( $content ) ) {
1591                                 wfDebug( __METHOD__ . ": activating conflict; section replace failed.\n" );
1592                                 $this->isConflict = true;
1593                                 $content = $textbox_content; // do not try to merge here!
1594                         } elseif ( $this->isConflict ) {
1595                                 # Attempt merge
1596                                 if ( $this->mergeChangesIntoContent( $content ) ) {
1597                                         // Successful merge! Maybe we should tell the user the good news?
1598                                         $this->isConflict = false;
1599                                         wfDebug( __METHOD__ . ": Suppressing edit conflict, successful merge.\n" );
1600                                 } else {
1601                                         $this->section = '';
1602                                         $this->textbox1 = ContentHandler::getContentText( $content );
1603                                         wfDebug( __METHOD__ . ": Keeping edit conflict, failed merge.\n" );
1604                                 }
1605                         }
1606
1607                         if ( $this->isConflict ) {
1608                                 $status->setResult( false, self::AS_CONFLICT_DETECTED );
1609                                 wfProfileOut( __METHOD__ );
1610                                 return $status;
1611                         }
1612
1613                         if ( !$this->runPostMergeFilters( $content, $status, $wgUser ) ) {
1614                                 wfProfileOut( __METHOD__ );
1615                                 return $status;
1616                         }
1617
1618                         if ( $this->section == 'new' ) {
1619                                 // Handle the user preference to force summaries here
1620                                 if ( !$this->allowBlankSummary && trim( $this->summary ) == '' ) {
1621                                         $this->missingSummary = true;
1622                                         $status->fatal( 'missingsummary' ); // or 'missingcommentheader' if $section == 'new'. Blegh
1623                                         $status->value = self::AS_SUMMARY_NEEDED;
1624                                         wfProfileOut( __METHOD__ );
1625                                         return $status;
1626                                 }
1627
1628                                 // Do not allow the user to post an empty comment
1629                                 if ( $this->textbox1 == '' ) {
1630                                         $this->missingComment = true;
1631                                         $status->fatal( 'missingcommenttext' );
1632                                         $status->value = self::AS_TEXTBOX_EMPTY;
1633                                         wfProfileOut( __METHOD__ );
1634                                         return $status;
1635                                 }
1636                         } elseif ( !$this->allowBlankSummary
1637                                 && !$content->equals( $this->getOriginalContent() )
1638                                 && !$content->isRedirect()
1639                                 && md5( $this->summary ) == $this->autoSumm
1640                         ) {
1641                                 $this->missingSummary = true;
1642                                 $status->fatal( 'missingsummary' );
1643                                 $status->value = self::AS_SUMMARY_NEEDED;
1644                                 wfProfileOut( __METHOD__ );
1645                                 return $status;
1646                         }
1647
1648                         # All's well
1649                         wfProfileIn( __METHOD__ . '-sectionanchor' );
1650                         $sectionanchor = '';
1651                         if ( $this->section == 'new' ) {
1652                                 if ( $this->sectiontitle !== '' ) {
1653                                         $sectionanchor = $wgParser->guessLegacySectionNameFromWikiText( $this->sectiontitle );
1654                                         // If no edit summary was specified, create one automatically from the section
1655                                         // title and have it link to the new section. Otherwise, respect the summary as
1656                                         // passed.
1657                                         if ( $this->summary === '' ) {
1658                                                 $cleanSectionTitle = $wgParser->stripSectionName( $this->sectiontitle );
1659                                                 $this->summary = wfMessage( 'newsectionsummary' )
1660                                                         ->rawParams( $cleanSectionTitle )->inContentLanguage()->text();
1661                                         }
1662                                 } elseif ( $this->summary !== '' ) {
1663                                         $sectionanchor = $wgParser->guessLegacySectionNameFromWikiText( $this->summary );
1664                                         # This is a new section, so create a link to the new section
1665                                         # in the revision summary.
1666                                         $cleanSummary = $wgParser->stripSectionName( $this->summary );
1667                                         $this->summary = wfMessage( 'newsectionsummary' )
1668                                                 ->rawParams( $cleanSummary )->inContentLanguage()->text();
1669                                 }
1670                         } elseif ( $this->section != '' ) {
1671                                 # Try to get a section anchor from the section source, redirect to edited section if header found
1672                                 # XXX: might be better to integrate this into Article::replaceSection
1673                                 # for duplicate heading checking and maybe parsing
1674                                 $hasmatch = preg_match( "/^ *([=]{1,6})(.*?)(\\1) *\\n/i", $this->textbox1, $matches );
1675                                 # we can't deal with anchors, includes, html etc in the header for now,
1676                                 # headline would need to be parsed to improve this
1677                                 if ( $hasmatch && strlen( $matches[2] ) > 0 ) {
1678                                         $sectionanchor = $wgParser->guessLegacySectionNameFromWikiText( $matches[2] );
1679                                 }
1680                         }
1681                         $result['sectionanchor'] = $sectionanchor;
1682                         wfProfileOut( __METHOD__ . '-sectionanchor' );
1683
1684                         // Save errors may fall down to the edit form, but we've now
1685                         // merged the section into full text. Clear the section field
1686                         // so that later submission of conflict forms won't try to
1687                         // replace that into a duplicated mess.
1688                         $this->textbox1 = $this->toEditText( $content );
1689                         $this->section = '';
1690
1691                         $status->value = self::AS_SUCCESS_UPDATE;
1692                 }
1693
1694                 // Check for length errors again now that the section is merged in
1695                         $this->kblength = (int)( strlen( $this->toEditText( $content ) ) / 1024 );
1696                 if ( $this->kblength > $wgMaxArticleSize ) {
1697                         $this->tooBig = true;
1698                         $status->setResult( false, self::AS_MAX_ARTICLE_SIZE_EXCEEDED );
1699                         wfProfileOut( __METHOD__ );
1700                         return $status;
1701                 }
1702
1703                 $flags = EDIT_DEFER_UPDATES | EDIT_AUTOSUMMARY |
1704                         ( $new ? EDIT_NEW : EDIT_UPDATE ) |
1705                         ( ( $this->minoredit && !$this->isNew ) ? EDIT_MINOR : 0 ) |
1706                         ( $bot ? EDIT_FORCE_BOT : 0 );
1707
1708                         $doEditStatus = $this->mArticle->doEditContent( $content, $this->summary, $flags,
1709                                                                                                                         false, null, $this->contentFormat );
1710
1711                 if ( !$doEditStatus->isOK() ) {
1712                         // Failure from doEdit()
1713                         // Show the edit conflict page for certain recognized errors from doEdit(),
1714                         // but don't show it for errors from extension hooks
1715                         $errors = $doEditStatus->getErrorsArray();
1716                         if ( in_array( $errors[0][0], array( 'edit-gone-missing', 'edit-conflict',
1717                                 'edit-already-exists' ) ) )
1718                         {
1719                                 $this->isConflict = true;
1720                                 // Destroys data doEdit() put in $status->value but who cares
1721                                 $doEditStatus->value = self::AS_END;
1722                         }
1723                         wfProfileOut( __METHOD__ );
1724                         return $doEditStatus;
1725                 }
1726
1727                 $result['nullEdit'] = $doEditStatus->hasMessage( 'edit-no-change' );
1728                 $result['redirect'] = $content->isRedirect();
1729                 $this->updateWatchlist();
1730                 wfProfileOut( __METHOD__ );
1731                 return $status;
1732         }
1733
1734         /**
1735          * Register the change of watch status
1736          */
1737         protected function updateWatchlist() {
1738                 global $wgUser;
1739
1740                 if ( $wgUser->isLoggedIn() && $this->watchthis != $wgUser->isWatched( $this->mTitle ) ) {
1741                         $fname = __METHOD__;
1742                         $title = $this->mTitle;
1743                         $watch = $this->watchthis;
1744
1745                         // Do this in its own transaction to reduce contention...
1746                         $dbw = wfGetDB( DB_MASTER );
1747                         $dbw->onTransactionIdle( function() use ( $dbw, $title, $watch, $wgUser, $fname ) {
1748                                 $dbw->begin( $fname );
1749                                 if ( $watch ) {
1750                                         WatchAction::doWatch( $title, $wgUser );
1751                                 } else {
1752                                         WatchAction::doUnwatch( $title, $wgUser );
1753                                 }
1754                                 $dbw->commit( $fname );
1755                         } );
1756                 }
1757         }
1758
1759         /**
1760          * Attempts to merge text content with base and current revisions
1761          *
1762          * @param $editText string
1763          *
1764          * @return bool
1765          * @deprecated since 1.21, use mergeChangesIntoContent() instead
1766          */
1767         function mergeChangesInto( &$editText ) {
1768                 ContentHandler::deprecated( __METHOD__, "1.21" );
1769
1770                 $editContent = $this->toEditContent( $editText );
1771
1772                 $ok = $this->mergeChangesIntoContent( $editContent );
1773
1774                 if ( $ok ) {
1775                         $editText = $this->toEditText( $editContent );
1776                         return true;
1777                 }
1778                 return false;
1779         }
1780
1781         /**
1782          * Attempts to do 3-way merge of edit content with a base revision
1783          * and current content, in case of edit conflict, in whichever way appropriate
1784          * for the content type.
1785          *
1786          * @since 1.21
1787          *
1788          * @param $editContent
1789          *
1790          * @return bool
1791          */
1792         private function mergeChangesIntoContent( &$editContent ) {
1793                 wfProfileIn( __METHOD__ );
1794
1795                 $db = wfGetDB( DB_MASTER );
1796
1797                 // This is the revision the editor started from
1798                 $baseRevision = $this->getBaseRevision();
1799                 $baseContent = $baseRevision ? $baseRevision->getContent() : null;
1800
1801                 if ( is_null( $baseContent ) ) {
1802                         wfProfileOut( __METHOD__ );
1803                         return false;
1804                 }
1805
1806                 // The current state, we want to merge updates into it
1807                 $currentRevision = Revision::loadFromTitle( $db, $this->mTitle );
1808                 $currentContent = $currentRevision ? $currentRevision->getContent() : null;
1809
1810                 if ( is_null( $currentContent ) ) {
1811                         wfProfileOut( __METHOD__ );
1812                         return false;
1813                 }
1814
1815                 $handler = ContentHandler::getForModelID( $baseContent->getModel() );
1816
1817                 $result = $handler->merge3( $baseContent, $editContent, $currentContent );
1818
1819                 if ( $result ) {
1820                         $editContent = $result;
1821                         wfProfileOut( __METHOD__ );
1822                         return true;
1823                 }
1824
1825                 wfProfileOut( __METHOD__ );
1826                 return false;
1827         }
1828
1829         /**
1830          * @return Revision
1831          */
1832         function getBaseRevision() {
1833                 if ( !$this->mBaseRevision ) {
1834                         $db = wfGetDB( DB_MASTER );
1835                         $baseRevision = Revision::loadFromTimestamp(
1836                                 $db, $this->mTitle, $this->edittime );
1837                         return $this->mBaseRevision = $baseRevision;
1838                 } else {
1839                         return $this->mBaseRevision;
1840                 }
1841         }
1842
1843         /**
1844          * Check given input text against $wgSpamRegex, and return the text of the first match.
1845          *
1846          * @param $text string
1847          *
1848          * @return string|bool matching string or false
1849          */
1850         public static function matchSpamRegex( $text ) {
1851                 global $wgSpamRegex;
1852                 // For back compatibility, $wgSpamRegex may be a single string or an array of regexes.
1853                 $regexes = (array)$wgSpamRegex;
1854                 return self::matchSpamRegexInternal( $text, $regexes );
1855         }
1856
1857         /**
1858          * Check given input text against $wgSpamRegex, and return the text of the first match.
1859          *
1860          * @param $text string
1861          *
1862          * @return string|bool  matching string or false
1863          */
1864         public static function matchSummarySpamRegex( $text ) {
1865                 global $wgSummarySpamRegex;
1866                 $regexes = (array)$wgSummarySpamRegex;
1867                 return self::matchSpamRegexInternal( $text, $regexes );
1868         }
1869
1870         /**
1871          * @param $text string
1872          * @param $regexes array
1873          * @return bool|string
1874          */
1875         protected static function matchSpamRegexInternal( $text, $regexes ) {
1876                 foreach ( $regexes as $regex ) {
1877                         $matches = array();
1878                         if ( preg_match( $regex, $text, $matches ) ) {
1879                                 return $matches[0];
1880                         }
1881                 }
1882                 return false;
1883         }
1884
1885         function setHeaders() {
1886                 global $wgOut, $wgUser;
1887
1888                 $wgOut->addModules( 'mediawiki.action.edit' );
1889
1890                 if ( $wgUser->getOption( 'uselivepreview', false ) ) {
1891                         $wgOut->addModules( 'mediawiki.action.edit.preview' );
1892                 }
1893                 // Bug #19334: textarea jumps when editing articles in IE8
1894                 $wgOut->addStyle( 'common/IE80Fixes.css', 'screen', 'IE 8' );
1895
1896                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1897
1898                 # Enabled article-related sidebar, toplinks, etc.
1899                 $wgOut->setArticleRelated( true );
1900
1901                 $contextTitle = $this->getContextTitle();
1902                 if ( $this->isConflict ) {
1903                         $msg = 'editconflict';
1904                 } elseif ( $contextTitle->exists() && $this->section != '' ) {
1905                         $msg = $this->section == 'new' ? 'editingcomment' : 'editingsection';
1906                 } else {
1907                         $msg = $contextTitle->exists() || ( $contextTitle->getNamespace() == NS_MEDIAWIKI && $contextTitle->getDefaultMessageText() !== false ) ?
1908                                 'editing' : 'creating';
1909                 }
1910                 # Use the title defined by DISPLAYTITLE magic word when present
1911                 $displayTitle = isset( $this->mParserOutput ) ? $this->mParserOutput->getDisplayTitle() : false;
1912                 if ( $displayTitle === false ) {
1913                         $displayTitle = $contextTitle->getPrefixedText();
1914                 }
1915                 $wgOut->setPageTitle( wfMessage( $msg, $displayTitle ) );
1916         }
1917
1918         /**
1919          * Show all applicable editing introductions
1920          */
1921         protected function showIntro() {
1922                 global $wgOut, $wgUser;
1923                 if ( $this->suppressIntro ) {
1924                         return;
1925                 }
1926
1927                 $namespace = $this->mTitle->getNamespace();
1928
1929                 if ( $namespace == NS_MEDIAWIKI ) {
1930                         # Show a warning if editing an interface message
1931                         $wgOut->wrapWikiMsg( "<div class='mw-editinginterface'>\n$1\n</div>", 'editinginterface' );
1932                 } else if( $namespace == NS_FILE ) {
1933                         # Show a hint to shared repo
1934                         $file = wfFindFile( $this->mTitle );
1935                         if( $file && !$file->isLocal() ) {
1936                                 $descUrl = $file->getDescriptionUrl();
1937                                 # there must be a description url to show a hint to shared repo
1938                                 if( $descUrl ) {
1939                                         if( !$this->mTitle->exists() ) {
1940                                                 $wgOut->wrapWikiMsg( "<div class=\"mw-sharedupload-desc-create\">\n$1\n</div>", array (
1941                                                                         'sharedupload-desc-create', $file->getRepo()->getDisplayName(), $descUrl
1942                                                 ) );
1943                                         } else {
1944                                                 $wgOut->wrapWikiMsg( "<div class=\"mw-sharedupload-desc-edit\">\n$1\n</div>", array(
1945                                                                         'sharedupload-desc-edit', $file->getRepo()->getDisplayName(), $descUrl
1946                                                 ) );
1947                                         }
1948                                 }
1949                         }
1950                 }
1951
1952                 # Show a warning message when someone creates/edits a user (talk) page but the user does not exist
1953                 # Show log extract when the user is currently blocked
1954                 if ( $namespace == NS_USER || $namespace == NS_USER_TALK ) {
1955                         $parts = explode( '/', $this->mTitle->getText(), 2 );
1956                         $username = $parts[0];
1957                         $user = User::newFromName( $username, false /* allow IP users*/ );
1958                         $ip = User::isIP( $username );
1959                         if ( !( $user && $user->isLoggedIn() ) && !$ip ) { # User does not exist
1960                                 $wgOut->wrapWikiMsg( "<div class=\"mw-userpage-userdoesnotexist error\">\n$1\n</div>",
1961                                         array( 'userpage-userdoesnotexist', wfEscapeWikiText( $username ) ) );
1962                         } elseif ( $user->isBlocked() ) { # Show log extract if the user is currently blocked
1963                                 LogEventsList::showLogExtract(
1964                                         $wgOut,
1965                                         'block',
1966                                         $user->getUserPage(),
1967                                         '',
1968                                         array(
1969                                                 'lim' => 1,
1970                                                 'showIfEmpty' => false,
1971                                                 'msgKey' => array(
1972                                                         'blocked-notice-logextract',
1973                                                         $user->getName() # Support GENDER in notice
1974                                                 )
1975                                         )
1976                                 );
1977                         }
1978                 }
1979                 # Try to add a custom edit intro, or use the standard one if this is not possible.
1980                 if ( !$this->showCustomIntro() && !$this->mTitle->exists() ) {
1981                         if ( $wgUser->isLoggedIn() ) {
1982                                 $wgOut->wrapWikiMsg( "<div class=\"mw-newarticletext\">\n$1\n</div>", 'newarticletext' );
1983                         } else {
1984                                 $wgOut->wrapWikiMsg( "<div class=\"mw-newarticletextanon\">\n$1\n</div>", 'newarticletextanon' );
1985                         }
1986                 }
1987                 # Give a notice if the user is editing a deleted/moved page...
1988                 if ( !$this->mTitle->exists() ) {
1989                         LogEventsList::showLogExtract( $wgOut, array( 'delete', 'move' ), $this->mTitle,
1990                                 '',
1991                                 array(
1992                                         'lim' => 10,
1993                                         'conds' => array( "log_action != 'revision'" ),
1994                                         'showIfEmpty' => false,
1995                                         'msgKey' => array( 'recreate-moveddeleted-warn' )
1996                                 )
1997                         );
1998                 }
1999         }
2000
2001         /**
2002          * Attempt to show a custom editing introduction, if supplied
2003          *
2004          * @return bool
2005          */
2006         protected function showCustomIntro() {
2007                 if ( $this->editintro ) {
2008                         $title = Title::newFromText( $this->editintro );
2009                         if ( $title instanceof Title && $title->exists() && $title->userCan( 'read' ) ) {
2010                                 global $wgOut;
2011                                 // Added using template syntax, to take <noinclude>'s into account.
2012                                 $wgOut->addWikiTextTitleTidy( '{{:' . $title->getFullText() . '}}', $this->mTitle );
2013                                 return true;
2014                         }
2015                 }
2016                 return false;
2017         }
2018
2019         /**
2020          * Gets an editable textual representation of $content.
2021          * The textual representation can be turned by into a Content object by the
2022          * toEditContent() method.
2023          *
2024          * If $content is null or false or a string, $content is returned unchanged.
2025          *
2026          * If the given Content object is not of a type that can be edited using the text base EditPage,
2027          * an exception will be raised. Set $this->allowNonTextContent to true to allow editing of non-textual
2028          * content.
2029          *
2030          * @param Content|null|bool|string $content
2031          * @return String the editable text form of the content.
2032          *
2033          * @throws MWException if $content is not an instance of TextContent and $this->allowNonTextContent is not true.
2034          */
2035         protected function toEditText( $content ) {
2036                 if ( $content === null || $content === false ) {
2037                         return $content;
2038                 }
2039
2040                 if ( is_string( $content ) ) {
2041                         return $content;
2042                 }
2043
2044                 if ( !$this->allowNonTextContent && !( $content instanceof TextContent ) ) {
2045                         throw new MWException( "This content model can not be edited as text: "
2046                                                                 . ContentHandler::getLocalizedName( $content->getModel() ) );
2047                 }
2048
2049                 return $content->serialize( $this->contentFormat );
2050         }
2051
2052         /**
2053          * Turns the given text into a Content object by unserializing it.
2054          *
2055          * If the resulting Content object is not of a type that can be edited using the text base EditPage,
2056          * an exception will be raised. Set $this->allowNonTextContent to true to allow editing of non-textual
2057          * content.
2058          *
2059          * @param string|null|bool $text Text to unserialize
2060          * @return Content The content object created from $text. If $text was false or null, false resp. null will be
2061          *                 returned instead.
2062          *
2063          * @throws MWException if unserializing the text results in a Content object that is not an instance of TextContent
2064          *          and $this->allowNonTextContent is not true.
2065          */
2066         protected function toEditContent( $text ) {
2067                 if ( $text === false || $text === null ) {
2068                         return $text;
2069                 }
2070
2071                 $content = ContentHandler::makeContent( $text, $this->getTitle(),
2072                         $this->contentModel, $this->contentFormat );
2073
2074                 if ( !$this->allowNonTextContent && !( $content instanceof TextContent ) ) {
2075                         throw new MWException( "This content model can not be edited as text: "
2076                                 . ContentHandler::getLocalizedName( $content->getModel() ) );
2077                 }
2078
2079                 return $content;
2080         }
2081
2082         /**
2083          * Send the edit form and related headers to $wgOut
2084          * @param $formCallback Callback|null that takes an OutputPage parameter; will be called
2085          *     during form output near the top, for captchas and the like.
2086          */
2087         function showEditForm( $formCallback = null ) {
2088                 global $wgOut, $wgUser;
2089
2090                 wfProfileIn( __METHOD__ );
2091
2092                 # need to parse the preview early so that we know which templates are used,
2093                 # otherwise users with "show preview after edit box" will get a blank list
2094                 # we parse this near the beginning so that setHeaders can do the title
2095                 # setting work instead of leaving it in getPreviewText
2096                 $previewOutput = '';
2097                 if ( $this->formtype == 'preview' ) {
2098                         $previewOutput = $this->getPreviewText();
2099                 }
2100
2101                 wfRunHooks( 'EditPage::showEditForm:initial', array( &$this, &$wgOut ) );
2102
2103                 $this->setHeaders();
2104
2105                 if ( $this->showHeader() === false ) {
2106                         wfProfileOut( __METHOD__ );
2107                         return;
2108                 }
2109
2110                 $wgOut->addHTML( $this->editFormPageTop );
2111
2112                 if ( $wgUser->getOption( 'previewontop' ) ) {
2113                         $this->displayPreviewArea( $previewOutput, true );
2114                 }
2115
2116                 $wgOut->addHTML( $this->editFormTextTop );
2117
2118                 $showToolbar = true;
2119                 if ( $this->wasDeletedSinceLastEdit() ) {
2120                         if ( $this->formtype == 'save' ) {
2121                                 // Hide the toolbar and edit area, user can click preview to get it back
2122                                 // Add an confirmation checkbox and explanation.
2123                                 $showToolbar = false;
2124                         } else {
2125                                 $wgOut->wrapWikiMsg( "<div class='error mw-deleted-while-editing'>\n$1\n</div>",
2126                                         'deletedwhileediting' );
2127                         }
2128                 }
2129
2130                 //@todo: add EditForm plugin interface and use it here!
2131                 //       search for textarea1 and textares2, and allow EditForm to override all uses.
2132                 $wgOut->addHTML( Html::openElement( 'form', array( 'id' => self::EDITFORM_ID, 'name' => self::EDITFORM_ID,
2133                         'method' => 'post', 'action' => $this->getActionURL( $this->getContextTitle() ),
2134                         'enctype' => 'multipart/form-data' ) ) );
2135
2136                 if ( is_callable( $formCallback ) ) {
2137                         call_user_func_array( $formCallback, array( &$wgOut ) );
2138                 }
2139
2140                 wfRunHooks( 'EditPage::showEditForm:fields', array( &$this, &$wgOut ) );
2141
2142                 // Put these up at the top to ensure they aren't lost on early form submission
2143                 $this->showFormBeforeText();
2144
2145                 if ( $this->wasDeletedSinceLastEdit() && 'save' == $this->formtype ) {
2146                         $username = $this->lastDelete->user_name;
2147                         $comment = $this->lastDelete->log_comment;
2148
2149                         // It is better to not parse the comment at all than to have templates expanded in the middle
2150                         // TODO: can the checkLabel be moved outside of the div so that wrapWikiMsg could be used?
2151                         $key = $comment === ''
2152                                 ? 'confirmrecreate-noreason'
2153                                 : 'confirmrecreate';
2154                         $wgOut->addHTML(
2155                                 '<div class="mw-confirm-recreate">' .
2156                                         wfMessage( $key, $username, "<nowiki>$comment</nowiki>" )->parse() .
2157                                 Xml::checkLabel( wfMessage( 'recreate' )->text(), 'wpRecreate', 'wpRecreate', false,
2158                                         array( 'title' => Linker::titleAttrib( 'recreate' ), 'tabindex' => 1, 'id' => 'wpRecreate' )
2159                                 ) .
2160                                 '</div>'
2161                         );
2162                 }
2163
2164                 # When the summary is hidden, also hide them on preview/show changes
2165                 if( $this->nosummary ) {
2166                         $wgOut->addHTML( Html::hidden( 'nosummary', true ) );
2167                 }
2168
2169                 # If a blank edit summary was previously provided, and the appropriate
2170                 # user preference is active, pass a hidden tag as wpIgnoreBlankSummary. This will stop the
2171                 # user being bounced back more than once in the event that a summary
2172                 # is not required.
2173                 #####
2174                 # For a bit more sophisticated detection of blank summaries, hash the
2175                 # automatic one and pass that in the hidden field wpAutoSummary.
2176                 if ( $this->missingSummary || ( $this->section == 'new' && $this->nosummary ) ) {
2177                         $wgOut->addHTML( Html::hidden( 'wpIgnoreBlankSummary', true ) );
2178                 }
2179
2180                 if ( $this->undidRev ) {
2181                         $wgOut->addHTML( Html::hidden( 'wpUndidRevision', $this->undidRev ) );
2182                 }
2183
2184                 if ( $this->hasPresetSummary ) {
2185                         // If a summary has been preset using &summary= we don't want to prompt for
2186                         // a different summary. Only prompt for a summary if the summary is blanked.
2187                         // (Bug 17416)
2188                         $this->autoSumm = md5( '' );
2189                 }
2190
2191                 $autosumm = $this->autoSumm ? $this->autoSumm : md5( $this->summary );
2192                 $wgOut->addHTML( Html::hidden( 'wpAutoSummary', $autosumm ) );
2193
2194                 $wgOut->addHTML( Html::hidden( 'oldid', $this->oldid ) );
2195
2196                 $wgOut->addHTML( Html::hidden( 'format', $this->contentFormat ) );
2197                 $wgOut->addHTML( Html::hidden( 'model', $this->contentModel ) );
2198
2199                 if ( $this->section == 'new' ) {
2200                         $this->showSummaryInput( true, $this->summary );
2201                         $wgOut->addHTML( $this->getSummaryPreview( true, $this->summary ) );
2202                 }
2203
2204                 $wgOut->addHTML( $this->editFormTextBeforeContent );
2205
2206                 if ( !$this->isCssJsSubpage && $showToolbar && $wgUser->getOption( 'showtoolbar' ) ) {
2207                         $wgOut->addHTML( EditPage::getEditToolbar() );
2208                 }
2209
2210                 if ( $this->isConflict ) {
2211                         // In an edit conflict bypass the overridable content form method
2212                         // and fallback to the raw wpTextbox1 since editconflicts can't be
2213                         // resolved between page source edits and custom ui edits using the
2214                         // custom edit ui.
2215                         $this->textbox2 = $this->textbox1;
2216
2217                         $content = $this->getCurrentContent();
2218                         $this->textbox1 = $this->toEditText( $content );
2219
2220                         $this->showTextbox1();
2221                 } else {
2222                         $this->showContentForm();
2223                 }
2224
2225                 $wgOut->addHTML( $this->editFormTextAfterContent );
2226
2227                 $this->showStandardInputs();
2228
2229                 $this->showFormAfterText();
2230
2231                 $this->showTosSummary();
2232
2233                 $this->showEditTools();
2234
2235                 $wgOut->addHTML( $this->editFormTextAfterTools . "\n" );
2236
2237                 $wgOut->addHTML( Html::rawElement( 'div', array( 'class' => 'templatesUsed' ),
2238                         Linker::formatTemplates( $this->getTemplates(), $this->preview, $this->section != '' ) ) );
2239
2240                 $wgOut->addHTML( Html::rawElement( 'div', array( 'class' => 'hiddencats' ),
2241                         Linker::formatHiddenCategories( $this->mArticle->getHiddenCategories() ) ) );
2242
2243                 if ( $this->isConflict ) {
2244                         try {
2245                                 $this->showConflict();
2246                         } catch ( MWContentSerializationException $ex ) {
2247                                 // this can't really happen, but be nice if it does.
2248                                 $msg = wfMessage( 'content-failed-to-parse', $this->contentModel, $this->contentFormat, $ex->getMessage() );
2249                                 $wgOut->addWikiText( '<div class="error">' . $msg->text() . '</div>' );
2250                         }
2251                 }
2252
2253                 $wgOut->addHTML( $this->editFormTextBottom . "\n</form>\n" );
2254
2255                 if ( !$wgUser->getOption( 'previewontop' ) ) {
2256                         $this->displayPreviewArea( $previewOutput, false );
2257                 }
2258
2259                 wfProfileOut( __METHOD__ );
2260         }
2261
2262         /**
2263          * Extract the section title from current section text, if any.
2264          *
2265          * @param string $text
2266          * @return Mixed|string or false
2267          */
2268         public static function extractSectionTitle( $text ) {
2269                 preg_match( "/^(=+)(.+)\\1\\s*(\n|$)/i", $text, $matches );
2270                 if ( !empty( $matches[2] ) ) {
2271                         global $wgParser;
2272                         return $wgParser->stripSectionName( trim( $matches[2] ) );
2273                 } else {
2274                         return false;
2275                 }
2276         }
2277
2278         protected function showHeader() {
2279                 global $wgOut, $wgUser, $wgMaxArticleSize, $wgLang;
2280
2281                 if ( $this->mTitle->isTalkPage() ) {
2282                         $wgOut->addWikiMsg( 'talkpagetext' );
2283                 }
2284
2285                 // Add edit notices
2286                 $wgOut->addHTML( implode( "\n", $this->mTitle->getEditNotices() ) );
2287
2288                 if ( $this->isConflict ) {
2289                         $wgOut->wrapWikiMsg( "<div class='mw-explainconflict'>\n$1\n</div>", 'explainconflict' );
2290                         $this->edittime = $this->mArticle->getTimestamp();
2291                 } else {
2292                         if ( $this->section != '' && !$this->isSectionEditSupported() ) {
2293                                 // We use $this->section to much before this and getVal('wgSection') directly in other places
2294                                 // at this point we can't reset $this->section to '' to fallback to non-section editing.
2295                                 // Someone is welcome to try refactoring though
2296                                 $wgOut->showErrorPage( 'sectioneditnotsupported-title', 'sectioneditnotsupported-text' );
2297                                 return false;
2298                         }
2299
2300                         if ( $this->section != '' && $this->section != 'new' ) {
2301                                 if ( !$this->summary && !$this->preview && !$this->diff ) {
2302                                         $sectionTitle = self::extractSectionTitle( $this->textbox1 ); //FIXME: use Content object
2303                                         if ( $sectionTitle !== false ) {
2304                                                 $this->summary = "/* $sectionTitle */ ";
2305                                         }
2306                                 }
2307                         }
2308
2309                         if ( $this->missingComment ) {
2310                                 $wgOut->wrapWikiMsg( "<div id='mw-missingcommenttext'>\n$1\n</div>", 'missingcommenttext' );
2311                         }
2312
2313                         if ( $this->missingSummary && $this->section != 'new' ) {
2314                                 $wgOut->wrapWikiMsg( "<div id='mw-missingsummary'>\n$1\n</div>", 'missingsummary' );
2315                         }
2316
2317                         if ( $this->missingSummary && $this->section == 'new' ) {
2318                                 $wgOut->wrapWikiMsg( "<div id='mw-missingcommentheader'>\n$1\n</div>", 'missingcommentheader' );
2319                         }
2320
2321                         if ( $this->hookError !== '' ) {
2322                                 $wgOut->addWikiText( $this->hookError );
2323                         }
2324
2325                         if ( !$this->checkUnicodeCompliantBrowser() ) {
2326                                 $wgOut->addWikiMsg( 'nonunicodebrowser' );
2327                         }
2328
2329                         if ( $this->section != 'new' ) {
2330                                 $revision = $this->mArticle->getRevisionFetched();
2331                                 if ( $revision ) {
2332                                         // Let sysop know that this will make private content public if saved
2333
2334                                         if ( !$revision->userCan( Revision::DELETED_TEXT, $wgUser ) ) {
2335                                                 $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", 'rev-deleted-text-permission' );
2336                                         } elseif ( $revision->isDeleted( Revision::DELETED_TEXT ) ) {
2337                                                 $wgOut->wrapWikiMsg( "<div class='mw-warning plainlinks'>\n$1\n</div>\n", 'rev-deleted-text-view' );
2338                                         }
2339
2340                                         if ( !$revision->isCurrent() ) {
2341                                                 $this->mArticle->setOldSubtitle( $revision->getId() );
2342                                                 $wgOut->addWikiMsg( 'editingold' );
2343                                         }
2344                                 } elseif ( $this->mTitle->exists() ) {
2345                                         // Something went wrong
2346
2347                                         $wgOut->wrapWikiMsg( "<div class='errorbox'>\n$1\n</div>\n",
2348                                                 array( 'missing-revision', $this->oldid ) );
2349                                 }
2350                         }
2351                 }
2352
2353                 if ( wfReadOnly() ) {
2354                         $wgOut->wrapWikiMsg( "<div id=\"mw-read-only-warning\">\n$1\n</div>", array( 'readonlywarning', wfReadOnlyReason() ) );
2355                 } elseif ( $wgUser->isAnon() ) {
2356                         if ( $this->formtype != 'preview' ) {
2357                                 $wgOut->wrapWikiMsg( "<div id=\"mw-anon-edit-warning\">\n$1</div>", 'anoneditwarning' );
2358                         } else {
2359                                 $wgOut->wrapWikiMsg( "<div id=\"mw-anon-preview-warning\">\n$1</div>", 'anonpreviewwarning' );
2360                         }
2361                 } else {
2362                         if ( $this->isCssJsSubpage ) {
2363                                 # Check the skin exists
2364                                 if ( $this->isWrongCaseCssJsPage ) {
2365                                         $wgOut->wrapWikiMsg( "<div class='error' id='mw-userinvalidcssjstitle'>\n$1\n</div>", array( 'userinvalidcssjstitle', $this->mTitle->getSkinFromCssJsSubpage() ) );
2366                                 }
2367                                 if ( $this->formtype !== 'preview' ) {
2368                                         if ( $this->isCssSubpage ) {
2369                                                 $wgOut->wrapWikiMsg( "<div id='mw-usercssyoucanpreview'>\n$1\n</div>", array( 'usercssyoucanpreview' ) );
2370                                         }
2371
2372                                         if ( $this->isJsSubpage ) {
2373                                                 $wgOut->wrapWikiMsg( "<div id='mw-userjsyoucanpreview'>\n$1\n</div>", array( 'userjsyoucanpreview' ) );
2374                                         }
2375                                 }
2376                         }
2377                 }
2378
2379                 if ( $this->mTitle->getNamespace() != NS_MEDIAWIKI && $this->mTitle->isProtected( 'edit' ) ) {
2380                         # Is the title semi-protected?
2381                         if ( $this->mTitle->isSemiProtected() ) {
2382                                 $noticeMsg = 'semiprotectedpagewarning';
2383                         } else {
2384                                 # Then it must be protected based on static groups (regular)
2385                                 $noticeMsg = 'protectedpagewarning';
2386                         }
2387                         LogEventsList::showLogExtract( $wgOut, 'protect', $this->mTitle, '',
2388                                 array( 'lim' => 1, 'msgKey' => array( $noticeMsg ) ) );
2389                 }
2390                 if ( $this->mTitle->isCascadeProtected() ) {
2391                         # Is this page under cascading protection from some source pages?
2392                         list( $cascadeSources, /* $restrictions */ ) = $this->mTitle->getCascadeProtectionSources();
2393                         $notice = "<div class='mw-cascadeprotectedwarning'>\n$1\n";
2394                         $cascadeSourcesCount = count( $cascadeSources );
2395                         if ( $cascadeSourcesCount > 0 ) {
2396                                 # Explain, and list the titles responsible
2397                                 foreach ( $cascadeSources as $page ) {
2398                                         $notice .= '* [[:' . $page->getPrefixedText() . "]]\n";
2399                                 }
2400                         }
2401                         $notice .= '</div>';
2402                         $wgOut->wrapWikiMsg( $notice, array( 'cascadeprotectedwarning', $cascadeSourcesCount ) );
2403                 }
2404                 if ( !$this->mTitle->exists() && $this->mTitle->getRestrictions( 'create' ) ) {
2405                         LogEventsList::showLogExtract( $wgOut, 'protect', $this->mTitle, '',
2406                                 array( 'lim' => 1,
2407                                         'showIfEmpty' => false,
2408                                         'msgKey' => array( 'titleprotectedwarning' ),
2409                                         'wrap' => "<div class=\"mw-titleprotectedwarning\">\n$1</div>" ) );
2410                 }
2411
2412                 if ( $this->kblength === false ) {
2413                         $this->kblength = (int)( strlen( $this->textbox1 ) / 1024 );
2414                 }
2415
2416                 if ( $this->tooBig || $this->kblength > $wgMaxArticleSize ) {
2417                         $wgOut->wrapWikiMsg( "<div class='error' id='mw-edit-longpageerror'>\n$1\n</div>",
2418                                 array( 'longpageerror', $wgLang->formatNum( $this->kblength ), $wgLang->formatNum( $wgMaxArticleSize ) ) );
2419                 } else {
2420                         if ( !wfMessage( 'longpage-hint' )->isDisabled() ) {
2421                                 $wgOut->wrapWikiMsg( "<div id='mw-edit-longpage-hint'>\n$1\n</div>",
2422                                         array( 'longpage-hint', $wgLang->formatSize( strlen( $this->textbox1 ) ), strlen( $this->textbox1 ) )
2423                                 );
2424                         }
2425                 }
2426                 # Add header copyright warning
2427                 $this->showHeaderCopyrightWarning();
2428         }
2429
2430         /**
2431          * Standard summary input and label (wgSummary), abstracted so EditPage
2432          * subclasses may reorganize the form.
2433          * Note that you do not need to worry about the label's for=, it will be
2434          * inferred by the id given to the input. You can remove them both by
2435          * passing array( 'id' => false ) to $userInputAttrs.
2436          *
2437          * @param string $summary The value of the summary input
2438          * @param string $labelText The html to place inside the label
2439          * @param array $inputAttrs of attrs to use on the input
2440          * @param array $spanLabelAttrs of attrs to use on the span inside the label
2441          *
2442          * @return array An array in the format array( $label, $input )
2443          */
2444         function getSummaryInput( $summary = "", $labelText = null, $inputAttrs = null, $spanLabelAttrs = null ) {
2445                 // Note: the maxlength is overridden in JS to 255 and to make it use UTF-8 bytes, not characters.
2446                 $inputAttrs = ( is_array( $inputAttrs ) ? $inputAttrs : array() ) + array(
2447                         'id' => 'wpSummary',
2448                         'maxlength' => '200',
2449                         'tabindex' => '1',
2450                         'size' => 60,
2451                         'spellcheck' => 'true',
2452                 ) + Linker::tooltipAndAccesskeyAttribs( 'summary' );
2453
2454                 $spanLabelAttrs = ( is_array( $spanLabelAttrs ) ? $spanLabelAttrs : array() ) + array(
2455                         'class' => $this->missingSummary ? 'mw-summarymissed' : 'mw-summary',
2456                         'id' => "wpSummaryLabel"
2457                 );
2458
2459                 $label = null;
2460                 if ( $labelText ) {
2461                         $label = Xml::tags( 'label', $inputAttrs['id'] ? array( 'for' => $inputAttrs['id'] ) : null, $labelText );
2462                         $label = Xml::tags( 'span', $spanLabelAttrs, $label );
2463                 }
2464
2465                 $input = Html::input( 'wpSummary', $summary, 'text', $inputAttrs );
2466
2467                 return array( $label, $input );
2468         }
2469
2470         /**
2471          * @param $isSubjectPreview Boolean: true if this is the section subject/title
2472          *                          up top, or false if this is the comment summary
2473          *                          down below the textarea
2474          * @param string $summary The text of the summary to display
2475          * @return String
2476          */
2477         protected function showSummaryInput( $isSubjectPreview, $summary = "" ) {
2478                 global $wgOut, $wgContLang;
2479                 # Add a class if 'missingsummary' is triggered to allow styling of the summary line
2480                 $summaryClass = $this->missingSummary ? 'mw-summarymissed' : 'mw-summary';
2481                 if ( $isSubjectPreview ) {
2482                         if ( $this->nosummary ) {
2483                                 return;
2484                         }
2485                 } else {
2486                         if ( !$this->mShowSummaryField ) {
2487                                 return;
2488                         }
2489                 }
2490                 $summary = $wgContLang->recodeForEdit( $summary );
2491                 $labelText = wfMessage( $isSubjectPreview ? 'subject' : 'summary' )->parse();
2492                 list( $label, $input ) = $this->getSummaryInput( $summary, $labelText, array( 'class' => $summaryClass ), array() );
2493                 $wgOut->addHTML( "{$label} {$input}" );
2494         }
2495
2496         /**
2497          * @param $isSubjectPreview Boolean: true if this is the section subject/title
2498          *                          up top, or false if this is the comment summary
2499          *                          down below the textarea
2500          * @param string $summary the text of the summary to display
2501          * @return String
2502          */
2503         protected function getSummaryPreview( $isSubjectPreview, $summary = "" ) {
2504                 // avoid spaces in preview, gets always trimmed on save
2505                 $summary = trim( $summary );
2506                 if ( !$summary || ( !$this->preview && !$this->diff ) ) {
2507                         return "";
2508                 }
2509
2510                 global $wgParser;
2511
2512                 if ( $isSubjectPreview ) {
2513                         $summary = wfMessage( 'newsectionsummary', $wgParser->stripSectionName( $summary ) )
2514                                 ->inContentLanguage()->text();
2515                 }
2516
2517                 $message = $isSubjectPreview ? 'subject-preview' : 'summary-preview';
2518
2519                 $summary = wfMessage( $message )->parse() . Linker::commentBlock( $summary, $this->mTitle, $isSubjectPreview );
2520                 return Xml::tags( 'div', array( 'class' => 'mw-summary-preview' ), $summary );
2521         }
2522
2523         protected function showFormBeforeText() {
2524                 global $wgOut;
2525                 $section = htmlspecialchars( $this->section );
2526                 $wgOut->addHTML( <<<HTML
2527 <input type='hidden' value="{$section}" name="wpSection" />
2528 <input type='hidden' value="{$this->starttime}" name="wpStarttime" />
2529 <input type='hidden' value="{$this->edittime}" name="wpEdittime" />
2530 <input type='hidden' value="{$this->scrolltop}" name="wpScrolltop" id="wpScrolltop" />
2531
2532 HTML
2533                 );
2534                 if ( !$this->checkUnicodeCompliantBrowser() ) {
2535                         $wgOut->addHTML( Html::hidden( 'safemode', '1' ) );
2536                 }
2537         }
2538
2539         protected function showFormAfterText() {
2540                 global $wgOut, $wgUser;
2541                 /**
2542                  * To make it harder for someone to slip a user a page
2543                  * which submits an edit form to the wiki without their
2544                  * knowledge, a random token is associated with the login
2545                  * session. If it's not passed back with the submission,
2546                  * we won't save the page, or render user JavaScript and
2547                  * CSS previews.
2548                  *
2549                  * For anon editors, who may not have a session, we just
2550                  * include the constant suffix to prevent editing from
2551                  * broken text-mangling proxies.
2552                  */
2553                 $wgOut->addHTML( "\n" . Html::hidden( "wpEditToken", $wgUser->getEditToken() ) . "\n" );
2554         }
2555
2556         /**
2557          * Subpage overridable method for printing the form for page content editing
2558          * By default this simply outputs wpTextbox1
2559          * Subclasses can override this to provide a custom UI for editing;
2560          * be it a form, or simply wpTextbox1 with a modified content that will be
2561          * reverse modified when extracted from the post data.
2562          * Note that this is basically the inverse for importContentFormData
2563          */
2564         protected function showContentForm() {
2565                 $this->showTextbox1();
2566         }
2567
2568         /**
2569          * Method to output wpTextbox1
2570          * The $textoverride method can be used by subclasses overriding showContentForm
2571          * to pass back to this method.
2572          *
2573          * @param array $customAttribs of html attributes to use in the textarea
2574          * @param string $textoverride optional text to override $this->textarea1 with
2575          */
2576         protected function showTextbox1( $customAttribs = null, $textoverride = null ) {
2577                 if ( $this->wasDeletedSinceLastEdit() && $this->formtype == 'save' ) {
2578                         $attribs = array( 'style' => 'display:none;' );
2579                 } else {
2580                         $classes = array(); // Textarea CSS
2581                         if ( $this->mTitle->getNamespace() != NS_MEDIAWIKI && $this->mTitle->isProtected( 'edit' ) ) {
2582                                 # Is the title semi-protected?
2583                                 if ( $this->mTitle->isSemiProtected() ) {
2584                                         $classes[] = 'mw-textarea-sprotected';
2585                                 } else {
2586                                         # Then it must be protected based on static groups (regular)
2587                                         $classes[] = 'mw-textarea-protected';
2588                                 }
2589                                 # Is the title cascade-protected?
2590                                 if ( $this->mTitle->isCascadeProtected() ) {
2591                                         $classes[] = 'mw-textarea-cprotected';
2592                                 }
2593                         }
2594
2595                         $attribs = array( 'tabindex' => 1 );
2596
2597                         if ( is_array( $customAttribs ) ) {
2598                                 $attribs += $customAttribs;
2599                         }
2600
2601                         if ( count( $classes ) ) {
2602                                 if ( isset( $attribs['class'] ) ) {
2603                                         $classes[] = $attribs['class'];
2604                                 }
2605                                 $attribs['class'] = implode( ' ', $classes );
2606                         }
2607                 }
2608
2609                 $this->showTextbox( $textoverride !== null ? $textoverride : $this->textbox1, 'wpTextbox1', $attribs );
2610         }
2611
2612         protected function showTextbox2() {
2613                 $this->showTextbox( $this->textbox2, 'wpTextbox2', array( 'tabindex' => 6, 'readonly' ) );
2614         }
2615
2616         protected function showTextbox( $text, $name, $customAttribs = array() ) {
2617                 global $wgOut, $wgUser;
2618
2619                 $wikitext = $this->safeUnicodeOutput( $text );
2620                 if ( strval( $wikitext ) !== '' ) {
2621                         // Ensure there's a newline at the end, otherwise adding lines
2622                         // is awkward.
2623                         // But don't add a newline if the ext is empty, or Firefox in XHTML
2624                         // mode will show an extra newline. A bit annoying.
2625                         $wikitext .= "\n";
2626                 }
2627
2628                 $attribs = $customAttribs + array(
2629                         'accesskey' => ',',
2630                         'id'   => $name,
2631                         'cols' => $wgUser->getIntOption( 'cols' ),
2632                         'rows' => $wgUser->getIntOption( 'rows' ),
2633                         'style' => '' // avoid php notices when appending preferences (appending allows customAttribs['style'] to still work
2634                 );
2635
2636                 $pageLang = $this->mTitle->getPageLanguage();
2637                 $attribs['lang'] = $pageLang->getCode();
2638                 $attribs['dir'] = $pageLang->getDir();
2639
2640                 $wgOut->addHTML( Html::textarea( $name, $wikitext, $attribs ) );
2641         }
2642
2643         protected function displayPreviewArea( $previewOutput, $isOnTop = false ) {
2644                 global $wgOut;
2645                 $classes = array();
2646                 if ( $isOnTop ) {
2647                         $classes[] = 'ontop';
2648                 }
2649
2650                 $attribs = array( 'id' => 'wikiPreview', 'class' => implode( ' ', $classes ) );
2651
2652                 if ( $this->formtype != 'preview' ) {
2653                         $attribs['style'] = 'display: none;';
2654                 }
2655
2656                 $wgOut->addHTML( Xml::openElement( 'div', $attribs ) );
2657
2658                 if ( $this->formtype == 'preview' ) {
2659                         $this->showPreview( $previewOutput );
2660                 }
2661
2662                 $wgOut->addHTML( '</div>' );
2663
2664                 if ( $this->formtype == 'diff' ) {
2665                         try {
2666                                 $this->showDiff();
2667                         } catch ( MWContentSerializationException $ex ) {
2668                                 $msg = wfMessage( 'content-failed-to-parse', $this->contentModel, $this->contentFormat, $ex->getMessage() );
2669                                 $wgOut->addWikiText( '<div class="error">' . $msg->text() . '</div>' );
2670                         }
2671                 }
2672         }
2673
2674         /**
2675          * Append preview output to $wgOut.
2676          * Includes category rendering if this is a category page.
2677          *
2678          * @param string $text the HTML to be output for the preview.
2679          */
2680         protected function showPreview( $text ) {
2681                 global $wgOut;
2682                 if ( $this->mTitle->getNamespace() == NS_CATEGORY ) {
2683                         $this->mArticle->openShowCategory();
2684                 }
2685                 # This hook seems slightly odd here, but makes things more
2686                 # consistent for extensions.
2687                 wfRunHooks( 'OutputPageBeforeHTML', array( &$wgOut, &$text ) );
2688                 $wgOut->addHTML( $text );
2689                 if ( $this->mTitle->getNamespace() == NS_CATEGORY ) {
2690                         $this->mArticle->closeShowCategory();
2691                 }
2692         }
2693
2694         /**
2695          * Get a diff between the current contents of the edit box and the
2696          * version of the page we're editing from.
2697          *
2698          * If this is a section edit, we'll replace the section as for final
2699          * save and then make a comparison.
2700          */
2701         function showDiff() {
2702                 global $wgUser, $wgContLang, $wgOut;
2703
2704                 $oldtitlemsg = 'currentrev';
2705                 # if message does not exist, show diff against the preloaded default
2706                 if( $this->mTitle->getNamespace() == NS_MEDIAWIKI && !$this->mTitle->exists() ) {
2707                         $oldtext = $this->mTitle->getDefaultMessageText();
2708                         if( $oldtext !== false ) {
2709                                 $oldtitlemsg = 'defaultmessagetext';
2710                                 $oldContent = $this->toEditContent( $oldtext );
2711                         } else {
2712                                 $oldContent = null;
2713                         }
2714                 } else {
2715                         $oldContent = $this->getCurrentContent();
2716                 }
2717
2718                 $textboxContent = $this->toEditContent( $this->textbox1 );
2719
2720                 $newContent = $this->mArticle->replaceSectionContent(
2721                                                         $this->section, $textboxContent,
2722                                                         $this->summary, $this->edittime );
2723
2724                 if ( $newContent ) {
2725                         ContentHandler::runLegacyHooks( 'EditPageGetDiffText', array( $this, &$newContent ) );
2726                         wfRunHooks( 'EditPageGetDiffContent', array( $this, &$newContent ) );
2727
2728                         $popts = ParserOptions::newFromUserAndLang( $wgUser, $wgContLang );
2729                         $newContent = $newContent->preSaveTransform( $this->mTitle, $wgUser, $popts );
2730                 }
2731
2732                 if ( ( $oldContent && !$oldContent->isEmpty() ) || ( $newContent && !$newContent->isEmpty() ) ) {
2733                         $oldtitle = wfMessage( $oldtitlemsg )->parse();
2734                         $newtitle = wfMessage( 'yourtext' )->parse();
2735
2736                         if ( !$oldContent ) {
2737                                 $oldContent = $newContent->getContentHandler()->makeEmptyContent();
2738                         }
2739
2740                         if ( !$newContent ) {
2741                                 $newContent = $oldContent->getContentHandler()->makeEmptyContent();
2742                         }
2743
2744                         $de = $oldContent->getContentHandler()->createDifferenceEngine( $this->mArticle->getContext() );
2745                         $de->setContent( $oldContent, $newContent );
2746
2747                         $difftext = $de->getDiff( $oldtitle, $newtitle );
2748                         $de->showDiffStyle();
2749                 } else {
2750                         $difftext = '';
2751                 }
2752
2753                 $wgOut->addHTML( '<div id="wikiDiff">' . $difftext . '</div>' );
2754         }
2755
2756         /**
2757          * Show the header copyright warning.
2758          */
2759         protected function showHeaderCopyrightWarning() {
2760                 $msg = 'editpage-head-copy-warn';
2761                 if ( !wfMessage( $msg )->isDisabled() ) {
2762                         global $wgOut;
2763                         $wgOut->wrapWikiMsg( "<div class='editpage-head-copywarn'>\n$1\n</div>",
2764                                 'editpage-head-copy-warn' );
2765                 }
2766         }
2767
2768         /**
2769          * Give a chance for site and per-namespace customizations of
2770          * terms of service summary link that might exist separately
2771          * from the copyright notice.
2772          *
2773          * This will display between the save button and the edit tools,
2774          * so should remain short!
2775          */
2776         protected function showTosSummary() {
2777                 $msg = 'editpage-tos-summary';
2778                 wfRunHooks( 'EditPageTosSummary', array( $this->mTitle, &$msg ) );
2779                 if ( !wfMessage( $msg )->isDisabled() ) {
2780                         global $wgOut;
2781                         $wgOut->addHTML( '<div class="mw-tos-summary">' );
2782                         $wgOut->addWikiMsg( $msg );
2783                         $wgOut->addHTML( '</div>' );
2784                 }
2785         }
2786
2787         protected function showEditTools() {
2788                 global $wgOut;
2789                 $wgOut->addHTML( '<div class="mw-editTools">' .
2790                         wfMessage( 'edittools' )->inContentLanguage()->parse() .
2791                         '</div>' );
2792         }
2793
2794         /**
2795          * Get the copyright warning
2796          *
2797          * Renamed to getCopyrightWarning(), old name kept around for backwards compatibility
2798          */
2799         protected function getCopywarn() {
2800                 return self::getCopyrightWarning( $this->mTitle );
2801         }
2802
2803         public static function getCopyrightWarning( $title ) {
2804                 global $wgRightsText;
2805                 if ( $wgRightsText ) {
2806                         $copywarnMsg = array( 'copyrightwarning',
2807                                 '[[' . wfMessage( 'copyrightpage' )->inContentLanguage()->text() . ']]',
2808                                 $wgRightsText );
2809                 } else {
2810                         $copywarnMsg = array( 'copyrightwarning2',
2811                                 '[[' . wfMessage( 'copyrightpage' )->inContentLanguage()->text() . ']]' );
2812                 }
2813                 // Allow for site and per-namespace customization of contribution/copyright notice.
2814                 wfRunHooks( 'EditPageCopyrightWarning', array( $title, &$copywarnMsg ) );
2815
2816                 return "<div id=\"editpage-copywarn\">\n" .
2817                         call_user_func_array( 'wfMessage', $copywarnMsg )->plain() . "\n</div>";
2818         }
2819
2820         protected function showStandardInputs( &$tabindex = 2 ) {
2821                 global $wgOut;
2822                 $wgOut->addHTML( "<div class='editOptions'>\n" );
2823
2824                 if ( $this->section != 'new' ) {
2825                         $this->showSummaryInput( false, $this->summary );
2826                         $wgOut->addHTML( $this->getSummaryPreview( false, $this->summary ) );
2827                 }
2828
2829                 $checkboxes = $this->getCheckboxes( $tabindex,
2830                         array( 'minor' => $this->minoredit, 'watch' => $this->watchthis ) );
2831                 $wgOut->addHTML( "<div class='editCheckboxes'>" . implode( $checkboxes, "\n" ) . "</div>\n" );
2832
2833                 // Show copyright warning.
2834                 $wgOut->addWikiText( $this->getCopywarn() );
2835                 $wgOut->addHTML( $this->editFormTextAfterWarn );
2836
2837                 $wgOut->addHTML( "<div class='editButtons'>\n" );
2838                 $wgOut->addHTML( implode( $this->getEditButtons( $tabindex ), "\n" ) . "\n" );
2839
2840                 $cancel = $this->getCancelLink();
2841                 if ( $cancel !== '' ) {
2842                         $cancel .= wfMessage( 'pipe-separator' )->text();
2843                 }
2844                 $edithelpurl = Skin::makeInternalOrExternalUrl( wfMessage( 'edithelppage' )->inContentLanguage()->text() );
2845                 $edithelp = '<a target="helpwindow" href="' . $edithelpurl . '">' .
2846                         wfMessage( 'edithelp' )->escaped() . '</a> ' .
2847                         wfMessage( 'newwindow' )->parse();
2848                 $wgOut->addHTML( "      <span class='cancelLink'>{$cancel}</span>\n" );
2849                 $wgOut->addHTML( "      <span class='editHelp'>{$edithelp}</span>\n" );
2850                 $wgOut->addHTML( "</div><!-- editButtons -->\n" );
2851                 wfRunHooks( 'EditPage::showStandardInputs:options', array( $this, $wgOut, &$tabindex ) );
2852                 $wgOut->addHTML( "</div><!-- editOptions -->\n" );
2853         }
2854
2855         /**
2856          * Show an edit conflict. textbox1 is already shown in showEditForm().
2857          * If you want to use another entry point to this function, be careful.
2858          */
2859         protected function showConflict() {
2860                 global $wgOut;
2861
2862                 if ( wfRunHooks( 'EditPageBeforeConflictDiff', array( &$this, &$wgOut ) ) ) {
2863                         $wgOut->wrapWikiMsg( '<h2>$1</h2>', "yourdiff" );
2864
2865                         $content1 = $this->toEditContent( $this->textbox1 );
2866                         $content2 = $this->toEditContent( $this->textbox2 );
2867
2868                         $handler = ContentHandler::getForModelID( $this->contentModel );
2869                         $de = $handler->createDifferenceEngine( $this->mArticle->getContext() );
2870                         $de->setContent( $content2, $content1 );
2871                         $de->showDiff(
2872                                 wfMessage( 'yourtext' )->parse(),
2873                                 wfMessage( 'storedversion' )->text()
2874                         );
2875
2876                         $wgOut->wrapWikiMsg( '<h2>$1</h2>', "yourtext" );
2877                         $this->showTextbox2();
2878                 }
2879         }
2880
2881         /**
2882          * @return string
2883          */
2884         public function getCancelLink() {
2885                 $cancelParams = array();
2886                 if ( !$this->isConflict && $this->oldid > 0 ) {
2887                         $cancelParams['oldid'] = $this->oldid;
2888                 }
2889
2890                 return Linker::linkKnown(
2891                         $this->getContextTitle(),
2892                         wfMessage( 'cancel' )->parse(),
2893                         array( 'id' => 'mw-editform-cancel' ),
2894                         $cancelParams
2895                 );
2896         }
2897
2898         /**
2899          * Returns the URL to use in the form's action attribute.
2900          * This is used by EditPage subclasses when simply customizing the action
2901          * variable in the constructor is not enough. This can be used when the
2902          * EditPage lives inside of a Special page rather than a custom page action.
2903          *
2904          * @param $title Title object for which is being edited (where we go to for &action= links)
2905          * @return string
2906          */
2907         protected function getActionURL( Title $title ) {
2908                 return $title->getLocalURL( array( 'action' => $this->action ) );
2909         }
2910
2911         /**
2912          * Check if a page was deleted while the user was editing it, before submit.
2913          * Note that we rely on the logging table, which hasn't been always there,
2914          * but that doesn't matter, because this only applies to brand new
2915          * deletes.
2916          */
2917         protected function wasDeletedSinceLastEdit() {
2918                 if ( $this->deletedSinceEdit !== null ) {
2919                         return $this->deletedSinceEdit;
2920                 }
2921
2922                 $this->deletedSinceEdit = false;
2923
2924                 if ( $this->mTitle->isDeletedQuick() ) {
2925                         $this->lastDelete = $this->getLastDelete();
2926                         if ( $this->lastDelete ) {
2927                                 $deleteTime = wfTimestamp( TS_MW, $this->lastDelete->log_timestamp );
2928                                 if ( $deleteTime > $this->starttime ) {
2929                                         $this->deletedSinceEdit = true;
2930                                 }
2931                         }
2932                 }
2933
2934                 return $this->deletedSinceEdit;
2935         }
2936
2937         protected function getLastDelete() {
2938                 $dbr = wfGetDB( DB_SLAVE );
2939                 $data = $dbr->selectRow(
2940                         array( 'logging', 'user' ),
2941                         array(
2942                                 'log_type',
2943                                 'log_action',
2944                                 'log_timestamp',
2945                                 'log_user',
2946                                 'log_namespace',
2947                                 'log_title',
2948                                 'log_comment',
2949                                 'log_params',
2950                                 'log_deleted',
2951                                 'user_name'
2952                         ), array(
2953                                 'log_namespace' => $this->mTitle->getNamespace(),
2954                                 'log_title' => $this->mTitle->getDBkey(),
2955                                 'log_type' => 'delete',
2956                                 'log_action' => 'delete',
2957                                 'user_id=log_user'
2958                         ),
2959                         __METHOD__,
2960                         array( 'LIMIT' => 1, 'ORDER BY' => 'log_timestamp DESC' )
2961                 );
2962                 // Quick paranoid permission checks...
2963                 if ( is_object( $data ) ) {
2964                         if ( $data->log_deleted & LogPage::DELETED_USER ) {
2965                                 $data->user_name = wfMessage( 'rev-deleted-user' )->escaped();
2966                         }
2967
2968                         if ( $data->log_deleted & LogPage::DELETED_COMMENT ) {
2969                                 $data->log_comment = wfMessage( 'rev-deleted-comment' )->escaped();
2970                         }
2971                 }
2972                 return $data;
2973         }
2974
2975         /**
2976          * Get the rendered text for previewing.
2977          * @throws MWException
2978          * @return string
2979          */
2980         function getPreviewText() {
2981                 global $wgOut, $wgUser, $wgRawHtml, $wgLang;
2982
2983                 wfProfileIn( __METHOD__ );
2984
2985                 if ( $wgRawHtml && !$this->mTokenOk ) {
2986                         // Could be an offsite preview attempt. This is very unsafe if
2987                         // HTML is enabled, as it could be an attack.
2988                         $parsedNote = '';
2989                         if ( $this->textbox1 !== '' ) {
2990                                 // Do not put big scary notice, if previewing the empty
2991                                 // string, which happens when you initially edit
2992                                 // a category page, due to automatic preview-on-open.
2993                                 $parsedNote = $wgOut->parse( "<div class='previewnote'>" .
2994                                         wfMessage( 'session_fail_preview_html' )->text() . "</div>", true, /* interface */true );
2995                         }
2996                         wfProfileOut( __METHOD__ );
2997                         return $parsedNote;
2998                 }
2999
3000                 $note = '';
3001
3002                 try {
3003                         $content = $this->toEditContent( $this->textbox1 );
3004
3005                         $previewHTML = '';
3006                         if ( !wfRunHooks( 'AlternateEditPreview', array( $this, &$content, &$previewHTML, &$this->mParserOutput ) ) ) {
3007                                 wfProfileOut( __METHOD__ );
3008                                 return $previewHTML;
3009                         }
3010
3011                         if ( $this->mTriedSave && !$this->mTokenOk ) {
3012                                 if ( $this->mTokenOkExceptSuffix ) {
3013                                         $note = wfMessage( 'token_suffix_mismatch' )->plain();
3014
3015                                 } else {
3016                                         $note = wfMessage( 'session_fail_preview' )->plain();
3017                                 }
3018                         } elseif ( $this->incompleteForm ) {
3019                                 $note = wfMessage( 'edit_form_incomplete' )->plain();
3020                         } else {
3021                                 $note = wfMessage( 'previewnote' )->plain() .
3022                                         ' [[#' . self::EDITFORM_ID . '|' . $wgLang->getArrow() . ' ' . wfMessage( 'continue-editing' )->text() . ']]';
3023                         }
3024
3025                         $parserOptions = $this->mArticle->makeParserOptions( $this->mArticle->getContext() );
3026                         $parserOptions->setEditSection( false );
3027                         $parserOptions->setIsPreview( true );
3028                         $parserOptions->setIsSectionPreview( !is_null( $this->section ) && $this->section !== '' );
3029
3030                         # don't parse non-wikitext pages, show message about preview
3031                         if ( $this->mTitle->isCssJsSubpage() || $this->mTitle->isCssOrJsPage() ) {
3032                                 if( $this->mTitle->isCssJsSubpage() ) {
3033                                         $level = 'user';
3034                                 } elseif( $this->mTitle->isCssOrJsPage() ) {
3035                                         $level = 'site';
3036                                 } else {
3037                                         $level = false;
3038                                 }
3039
3040                                 if ( $content->getModel() == CONTENT_MODEL_CSS ) {
3041                                         $format = 'css';
3042                                 } elseif ( $content->getModel() == CONTENT_MODEL_JAVASCRIPT ) {
3043                                         $format = 'js';
3044                                 } else {
3045                                         $format = false;
3046                                 }
3047
3048                                 # Used messages to make sure grep find them:
3049                                 # Messages: usercsspreview, userjspreview, sitecsspreview, sitejspreview
3050                                 if( $level && $format ) {
3051                                         $note = "<div id='mw-{$level}{$format}preview'>" . wfMessage( "{$level}{$format}preview" )->text() . "</div>";
3052                                 }
3053                         }
3054
3055                         $rt = $content->getRedirectChain();
3056                         if ( $rt ) {
3057                                 $previewHTML = $this->mArticle->viewRedirect( $rt, false );
3058                         } else {
3059
3060                                 # If we're adding a comment, we need to show the
3061                                 # summary as the headline
3062                                 if ( $this->section === "new" && $this->summary !== "" ) {
3063                                         $content = $content->addSectionHeader( $this->summary );
3064                                 }
3065
3066                                 $hook_args = array( $this, &$content );
3067                                 ContentHandler::runLegacyHooks( 'EditPageGetPreviewText', $hook_args );
3068                                 wfRunHooks( 'EditPageGetPreviewContent', $hook_args );
3069
3070                                 $parserOptions->enableLimitReport();
3071
3072                                 # For CSS/JS pages, we should have called the ShowRawCssJs hook here.
3073                                 # But it's now deprecated, so never mind
3074
3075                                 $content = $content->preSaveTransform( $this->mTitle, $wgUser, $parserOptions );
3076                                 $parserOutput = $content->getParserOutput( $this->getArticle()->getTitle(), null, $parserOptions );
3077
3078                                 $previewHTML = $parserOutput->getText();
3079                                 $this->mParserOutput = $parserOutput;
3080                                 $wgOut->addParserOutputNoText( $parserOutput );
3081
3082                                 if ( count( $parserOutput->getWarnings() ) ) {
3083                                         $note .= "\n\n" . implode( "\n\n", $parserOutput->getWarnings() );
3084                                 }
3085                         }
3086                 } catch ( MWContentSerializationException $ex ) {
3087                         $m = wfMessage( 'content-failed-to-parse', $this->contentModel, $this->contentFormat, $ex->getMessage() );
3088                         $note .= "\n\n" . $m->parse();
3089                         $previewHTML = '';
3090                 }
3091
3092                 if ( $this->isConflict ) {
3093                         $conflict = '<h2 id="mw-previewconflict">' . wfMessage( 'previewconflict' )->escaped() . "</h2>\n";
3094                 } else {
3095                         $conflict = '<hr />';
3096                 }
3097
3098                 $previewhead = "<div class='previewnote'>\n" .
3099                         '<h2 id="mw-previewheader">' . wfMessage( 'preview' )->escaped() . "</h2>" .
3100                         $wgOut->parse( $note, true, /* interface */true ) . $conflict . "</div>\n";
3101
3102                 $pageLang = $this->mTitle->getPageLanguage();
3103                 $attribs = array( 'lang' => $pageLang->getCode(), 'dir' => $pageLang->getDir(),
3104                         'class' => 'mw-content-' . $pageLang->getDir() );
3105                 $previewHTML = Html::rawElement( 'div', $attribs, $previewHTML );
3106
3107                 wfProfileOut( __METHOD__ );
3108                 return $previewhead . $previewHTML . $this->previewTextAfterContent;
3109         }
3110
3111         /**
3112          * @return Array
3113          */
3114         function getTemplates() {
3115                 if ( $this->preview || $this->section != '' ) {
3116                         $templates = array();
3117                         if ( !isset( $this->mParserOutput ) ) {
3118                                 return $templates;
3119                         }
3120                         foreach ( $this->mParserOutput->getTemplates() as $ns => $template ) {
3121                                 foreach ( array_keys( $template ) as $dbk ) {
3122                                         $templates[] = Title::makeTitle( $ns, $dbk );
3123                                 }
3124                         }
3125                         return $templates;
3126                 } else {
3127                         return $this->mTitle->getTemplateLinksFrom();
3128                 }
3129         }
3130
3131         /**
3132          * Shows a bulletin board style toolbar for common editing functions.
3133          * It can be disabled in the user preferences.
3134          * The necessary JavaScript code can be found in skins/common/edit.js.
3135          *
3136          * @return string
3137          */
3138         static function getEditToolbar() {
3139                 global $wgStylePath, $wgContLang, $wgLang, $wgOut;
3140                 global $wgUseTeX, $wgEnableUploads, $wgForeignFileRepos;
3141
3142                 $imagesAvailable = $wgEnableUploads || count( $wgForeignFileRepos );
3143
3144                 /**
3145                  * $toolarray is an array of arrays each of which includes the
3146                  * filename of the button image (without path), the opening
3147                  * tag, the closing tag, optionally a sample text that is
3148                  * inserted between the two when no selection is highlighted
3149                  * and.  The tip text is shown when the user moves the mouse
3150                  * over the button.
3151                  *
3152                  * Also here: accesskeys (key), which are not used yet until
3153                  * someone can figure out a way to make them work in
3154                  * IE. However, we should make sure these keys are not defined
3155                  * on the edit page.
3156                  */
3157                 $toolarray = array(
3158                         array(
3159                                 'image'  => $wgLang->getImageFile( 'button-bold' ),
3160                                 'id'     => 'mw-editbutton-bold',
3161                                 'open'   => '\'\'\'',
3162                                 'close'  => '\'\'\'',
3163                                 'sample' => wfMessage( 'bold_sample' )->text(),
3164                                 'tip'    => wfMessage( 'bold_tip' )->text(),
3165                                 'key'    => 'B'
3166                         ),
3167                         array(
3168                                 'image'  => $wgLang->getImageFile( 'button-italic' ),
3169                                 'id'     => 'mw-editbutton-italic',
3170                                 'open'   => '\'\'',
3171                                 'close'  => '\'\'',
3172                                 'sample' => wfMessage( 'italic_sample' )->text(),
3173                                 'tip'    => wfMessage( 'italic_tip' )->text(),
3174                                 'key'    => 'I'
3175                         ),
3176                         array(
3177                                 'image'  => $wgLang->getImageFile( 'button-link' ),
3178                                 'id'     => 'mw-editbutton-link',
3179                                 'open'   => '[[',
3180                                 'close'  => ']]',
3181                                 'sample' => wfMessage( 'link_sample' )->text(),
3182                                 'tip'    => wfMessage( 'link_tip' )->text(),
3183                                 'key'    => 'L'
3184                         ),
3185                         array(
3186                                 'image'  => $wgLang->getImageFile( 'button-extlink' ),
3187                                 'id'     => 'mw-editbutton-extlink',
3188                                 'open'   => '[',
3189                                 'close'  => ']',
3190                                 'sample' => wfMessage( 'extlink_sample' )->text(),
3191                                 'tip'    => wfMessage( 'extlink_tip' )->text(),
3192                                 'key'    => 'X'
3193                         ),
3194                         array(
3195                                 'image'  => $wgLang->getImageFile( 'button-headline' ),
3196                                 'id'     => 'mw-editbutton-headline',
3197                                 'open'   => "\n== ",
3198                                 'close'  => " ==\n",
3199                                 'sample' => wfMessage( 'headline_sample' )->text(),
3200                                 'tip'    => wfMessage( 'headline_tip' )->text(),
3201                                 'key'    => 'H'
3202                         ),
3203                         $imagesAvailable ? array(
3204                                 'image'  => $wgLang->getImageFile( 'button-image' ),
3205                                 'id'     => 'mw-editbutton-image',
3206                                 'open'   => '[[' . $wgContLang->getNsText( NS_FILE ) . ':',
3207                                 'close'  => ']]',
3208                                 'sample' => wfMessage( 'image_sample' )->text(),
3209                                 'tip'    => wfMessage( 'image_tip' )->text(),
3210                                 'key'    => 'D',
3211                         ) : false,
3212                         $imagesAvailable ? array(
3213                                 'image'  => $wgLang->getImageFile( 'button-media' ),
3214                                 'id'     => 'mw-editbutton-media',
3215                                 'open'   => '[[' . $wgContLang->getNsText( NS_MEDIA ) . ':',
3216                                 'close'  => ']]',
3217                                 'sample' => wfMessage( 'media_sample' )->text(),
3218                                 'tip'    => wfMessage( 'media_tip' )->text(),
3219                                 'key'    => 'M'
3220                         ) : false,
3221                         $wgUseTeX ? array(
3222                                 'image'  => $wgLang->getImageFile( 'button-math' ),
3223                                 'id'     => 'mw-editbutton-math',
3224                                 'open'   => "<math>",
3225                                 'close'  => "</math>",
3226                                 'sample' => wfMessage( 'math_sample' )->text(),
3227                                 'tip'    => wfMessage( 'math_tip' )->text(),
3228                                 'key'    => 'C'
3229                         ) : false,
3230                         array(
3231                                 'image'  => $wgLang->getImageFile( 'button-nowiki' ),
3232                                 'id'     => 'mw-editbutton-nowiki',
3233                                 'open'   => "<nowiki>",
3234                                 'close'  => "</nowiki>",
3235                                 'sample' => wfMessage( 'nowiki_sample' )->text(),
3236                                 'tip'    => wfMessage( 'nowiki_tip' )->text(),
3237                                 'key'    => 'N'
3238                         ),
3239                         array(
3240                                 'image'  => $wgLang->getImageFile( 'button-sig' ),
3241                                 'id'     => 'mw-editbutton-signature',
3242                                 'open'   => '--~~~~',
3243                                 'close'  => '',
3244                                 'sample' => '',
3245                                 'tip'    => wfMessage( 'sig_tip' )->text(),
3246                                 'key'    => 'Y'
3247                         ),
3248                         array(
3249                                 'image'  => $wgLang->getImageFile( 'button-hr' ),
3250                                 'id'     => 'mw-editbutton-hr',
3251                                 'open'   => "\n----\n",
3252                                 'close'  => '',
3253                                 'sample' => '',
3254                                 'tip'    => wfMessage( 'hr_tip' )->text(),
3255                                 'key'    => 'R'
3256                         )
3257                 );
3258
3259                 $script = 'mw.loader.using("mediawiki.action.edit", function() {';
3260                 foreach ( $toolarray as $tool ) {
3261                         if ( !$tool ) {
3262                                 continue;
3263                         }
3264
3265                         $params = array(
3266                                 $image = $wgStylePath . '/common/images/' . $tool['image'],
3267                                 // Note that we use the tip both for the ALT tag and the TITLE tag of the image.
3268                                 // Older browsers show a "speedtip" type message only for ALT.
3269                                 // Ideally these should be different, realistically they
3270                                 // probably don't need to be.
3271                                 $tip = $tool['tip'],
3272                                 $open = $tool['open'],
3273                                 $close = $tool['close'],
3274                                 $sample = $tool['sample'],
3275                                 $cssId = $tool['id'],
3276                         );
3277
3278                         $script .= Xml::encodeJsCall( 'mw.toolbar.addButton', $params );
3279                 }
3280
3281                 // This used to be called on DOMReady from mediawiki.action.edit, which
3282                 // ended up causing race conditions with the setup code above.
3283                 $script .= "\n" .
3284                         "// Create button bar\n" .
3285                         "$(function() { mw.toolbar.init(); } );\n";
3286
3287                 $script .= '});';
3288                 $wgOut->addScript( Html::inlineScript( ResourceLoader::makeLoaderConditionalScript( $script ) ) );
3289
3290                 $toolbar = '<div id="toolbar"></div>';
3291
3292                 wfRunHooks( 'EditPageBeforeEditToolbar', array( &$toolbar ) );
3293
3294                 return $toolbar;
3295         }
3296
3297         /**
3298          * Returns an array of html code of the following checkboxes:
3299          * minor and watch
3300          *
3301          * @param int $tabindex Current tabindex
3302          * @param array $checked of checkbox => bool, where bool indicates the checked
3303          *                 status of the checkbox
3304          *
3305          * @return array
3306          */
3307         public function getCheckboxes( &$tabindex, $checked ) {
3308                 global $wgUser;
3309
3310                 $checkboxes = array();
3311
3312                 // don't show the minor edit checkbox if it's a new page or section
3313                 if ( !$this->isNew ) {
3314                         $checkboxes['minor'] = '';
3315                         $minorLabel = wfMessage( 'minoredit' )->parse();
3316                         if ( $wgUser->isAllowed( 'minoredit' ) ) {
3317                                 $attribs = array(
3318                                         'tabindex'  => ++$tabindex,
3319                                         'accesskey' => wfMessage( 'accesskey-minoredit' )->text(),
3320                                         'id'        => 'wpMinoredit',
3321                                 );
3322                                 $checkboxes['minor'] =
3323                                         Xml::check( 'wpMinoredit', $checked['minor'], $attribs ) .
3324                                         "&#160;<label for='wpMinoredit' id='mw-editpage-minoredit'" .
3325                                         Xml::expandAttributes( array( 'title' => Linker::titleAttrib( 'minoredit', 'withaccess' ) ) ) .
3326                                         ">{$minorLabel}</label>";
3327                         }
3328                 }
3329
3330                 $watchLabel = wfMessage( 'watchthis' )->parse();
3331                 $checkboxes['watch'] = '';
3332                 if ( $wgUser->isLoggedIn() ) {
3333                         $attribs = array(
3334                                 'tabindex'  => ++$tabindex,
3335                                 'accesskey' => wfMessage( 'accesskey-watch' )->text(),
3336                                 'id'        => 'wpWatchthis',
3337                         );
3338                         $checkboxes['watch'] =
3339                                 Xml::check( 'wpWatchthis', $checked['watch'], $attribs ) .
3340                                 "&#160;<label for='wpWatchthis' id='mw-editpage-watch'" .
3341                                 Xml::expandAttributes( array( 'title' => Linker::titleAttrib( 'watch', 'withaccess' ) ) ) .
3342                                 ">{$watchLabel}</label>";
3343                 }
3344                 wfRunHooks( 'EditPageBeforeEditChecks', array( &$this, &$checkboxes, &$tabindex ) );
3345                 return $checkboxes;
3346         }
3347
3348         /**
3349          * Returns an array of html code of the following buttons:
3350          * save, diff, preview and live
3351          *
3352          * @param int $tabindex Current tabindex
3353          *
3354          * @return array
3355          */
3356         public function getEditButtons( &$tabindex ) {
3357                 $buttons = array();
3358
3359                 $temp = array(
3360                         'id'        => 'wpSave',
3361                         'name'      => 'wpSave',
3362                         'type'      => 'submit',
3363                         'tabindex'  => ++$tabindex,
3364                         'value'     => wfMessage( 'savearticle' )->text(),
3365                         'accesskey' => wfMessage( 'accesskey-save' )->text(),
3366                         'title'     => wfMessage( 'tooltip-save' )->text() . ' [' . wfMessage( 'accesskey-save' )->text() . ']',
3367                 );
3368                 $buttons['save'] = Xml::element( 'input', $temp, '' );
3369
3370                 ++$tabindex; // use the same for preview and live preview
3371                 $temp = array(
3372                         'id'        => 'wpPreview',
3373                         'name'      => 'wpPreview',
3374                         'type'      => 'submit',
3375                         'tabindex'  => $tabindex,
3376                         'value'     => wfMessage( 'showpreview' )->text(),
3377                         'accesskey' => wfMessage( 'accesskey-preview' )->text(),
3378                         'title'     => wfMessage( 'tooltip-preview' )->text() . ' [' . wfMessage( 'accesskey-preview' )->text() . ']',
3379                 );
3380                 $buttons['preview'] = Xml::element( 'input', $temp, '' );
3381                 $buttons['live'] = '';
3382
3383                 $temp = array(
3384                         'id'        => 'wpDiff',
3385                         'name'      => 'wpDiff',
3386                         'type'      => 'submit',
3387                         'tabindex'  => ++$tabindex,
3388                         'value'     => wfMessage( 'showdiff' )->text(),
3389                         'accesskey' => wfMessage( 'accesskey-diff' )->text(),
3390                         'title'     => wfMessage( 'tooltip-diff' )->text() . ' [' . wfMessage( 'accesskey-diff' )->text() . ']',
3391                 );
3392                 $buttons['diff'] = Xml::element( 'input', $temp, '' );
3393
3394                 wfRunHooks( 'EditPageBeforeEditButtons', array( &$this, &$buttons, &$tabindex ) );
3395                 return $buttons;
3396         }
3397
3398         /**
3399          * Output preview text only. This can be sucked into the edit page
3400          * via JavaScript, and saves the server time rendering the skin as
3401          * well as theoretically being more robust on the client (doesn't
3402          * disturb the edit box's undo history, won't eat your text on
3403          * failure, etc).
3404          *
3405          * @todo This doesn't include category or interlanguage links.
3406          *       Would need to enhance it a bit, "<s>maybe wrap them in XML
3407          *       or something...</s>" that might also require more skin
3408          *       initialization, so check whether that's a problem.
3409          */
3410         function livePreview() {
3411                 global $wgOut;
3412                 $wgOut->disable();
3413                 header( 'Content-type: text/xml; charset=utf-8' );
3414                 header( 'Cache-control: no-cache' );
3415
3416                 $previewText = $this->getPreviewText();
3417                 #$categories = $skin->getCategoryLinks();
3418
3419                 $s =
3420                 '<?xml version="1.0" encoding="UTF-8" ?>' . "\n" .
3421                 Xml::tags( 'livepreview', null,
3422                         Xml::element( 'preview', null, $previewText )
3423                         #.      Xml::element( 'category', null, $categories )
3424                 );
3425                 echo $s;
3426         }
3427
3428         /**
3429          * Call the stock "user is blocked" page
3430          *
3431          * @deprecated in 1.19; throw an exception directly instead
3432          */
3433         function blockedPage() {
3434                 wfDeprecated( __METHOD__, '1.19' );
3435                 global $wgUser;
3436
3437                 throw new UserBlockedError( $wgUser->getBlock() );
3438         }
3439
3440         /**
3441          * Produce the stock "please login to edit pages" page
3442          *
3443          * @deprecated in 1.19; throw an exception directly instead
3444          */
3445         function userNotLoggedInPage() {
3446                 wfDeprecated( __METHOD__, '1.19' );
3447                 throw new PermissionsError( 'edit' );
3448         }
3449
3450         /**
3451          * Show an error page saying to the user that he has insufficient permissions
3452          * to create a new page
3453          *
3454          * @deprecated in 1.19; throw an exception directly instead
3455          */
3456         function noCreatePermission() {
3457                 wfDeprecated( __METHOD__, '1.19' );
3458                 $permission = $this->mTitle->isTalkPage() ? 'createtalk' : 'createpage';
3459                 throw new PermissionsError( $permission );
3460         }
3461
3462         /**
3463          * Creates a basic error page which informs the user that
3464          * they have attempted to edit a nonexistent section.
3465          */
3466         function noSuchSectionPage() {
3467                 global $wgOut;
3468
3469                 $wgOut->prepareErrorPage( wfMessage( 'nosuchsectiontitle' ) );
3470
3471                 $res = wfMessage( 'nosuchsectiontext', $this->section )->parseAsBlock();
3472                 wfRunHooks( 'EditPageNoSuchSection', array( &$this, &$res ) );
3473                 $wgOut->addHTML( $res );
3474
3475                 $wgOut->returnToMain( false, $this->mTitle );
3476         }
3477
3478         /**
3479          * Produce the stock "your edit contains spam" page
3480          *
3481          * @param string|bool $match Text which triggered one or more filters
3482          * @deprecated since 1.17 Use method spamPageWithContent() instead
3483          */
3484         static function spamPage( $match = false ) {
3485                 wfDeprecated( __METHOD__, '1.17' );
3486
3487                 global $wgOut, $wgTitle;
3488
3489                 $wgOut->prepareErrorPage( wfMessage( 'spamprotectiontitle' ) );
3490
3491                 $wgOut->addHTML( '<div id="spamprotected">' );
3492                 $wgOut->addWikiMsg( 'spamprotectiontext' );
3493                 if ( $match ) {
3494                         $wgOut->addWikiMsg( 'spamprotectionmatch', wfEscapeWikiText( $match ) );
3495                 }
3496                 $wgOut->addHTML( '</div>' );
3497
3498                 $wgOut->returnToMain( false, $wgTitle );
3499         }
3500
3501         /**
3502          * Show "your edit contains spam" page with your diff and text
3503          *
3504          * @param $match string|Array|bool Text (or array of texts) which triggered one or more filters
3505          */
3506         public function spamPageWithContent( $match = false ) {
3507                 global $wgOut, $wgLang;
3508                 $this->textbox2 = $this->textbox1;
3509
3510                 if( is_array( $match ) ) {
3511                         $match = $wgLang->listToText( $match );
3512                 }
3513                 $wgOut->prepareErrorPage( wfMessage( 'spamprotectiontitle' ) );
3514
3515                 $wgOut->addHTML( '<div id="spamprotected">' );
3516                 $wgOut->addWikiMsg( 'spamprotectiontext' );
3517                 if ( $match ) {
3518                         $wgOut->addWikiMsg( 'spamprotectionmatch', wfEscapeWikiText( $match ) );
3519                 }
3520                 $wgOut->addHTML( '</div>' );
3521
3522                 $wgOut->wrapWikiMsg( '<h2>$1</h2>', "yourdiff" );
3523                 $this->showDiff();
3524
3525                 $wgOut->wrapWikiMsg( '<h2>$1</h2>', "yourtext" );
3526                 $this->showTextbox2();
3527
3528                 $wgOut->addReturnTo( $this->getContextTitle(), array( 'action' => 'edit' ) );
3529         }
3530
3531         /**
3532          * Format an anchor fragment as it would appear for a given section name
3533          * @param $text String
3534          * @return String
3535          * @private
3536          */
3537         function sectionAnchor( $text ) {
3538                 global $wgParser;
3539                 return $wgParser->guessSectionNameFromWikiText( $text );
3540         }
3541
3542         /**
3543          * Check if the browser is on a blacklist of user-agents known to
3544          * mangle UTF-8 data on form submission. Returns true if Unicode
3545          * should make it through, false if it's known to be a problem.
3546          * @return bool
3547          * @private
3548          */
3549         function checkUnicodeCompliantBrowser() {
3550                 global $wgBrowserBlackList, $wgRequest;
3551
3552                 $currentbrowser = $wgRequest->getHeader( 'User-Agent' );
3553                 if ( $currentbrowser === false ) {
3554                         // No User-Agent header sent? Trust it by default...
3555                         return true;
3556                 }
3557
3558                 foreach ( $wgBrowserBlackList as $browser ) {
3559                         if ( preg_match( $browser, $currentbrowser ) ) {
3560                                 return false;
3561                         }
3562                 }
3563                 return true;
3564         }
3565
3566         /**
3567          * Filter an input field through a Unicode de-armoring process if it
3568          * came from an old browser with known broken Unicode editing issues.
3569          *
3570          * @param $request WebRequest
3571          * @param $field String
3572          * @return String
3573          * @private
3574          */
3575         function safeUnicodeInput( $request, $field ) {
3576                 $text = rtrim( $request->getText( $field ) );
3577                 return $request->getBool( 'safemode' )
3578                         ? $this->unmakesafe( $text )
3579                         : $text;
3580         }
3581
3582         /**
3583          * @param $request WebRequest
3584          * @param $text string
3585          * @return string
3586          */
3587         function safeUnicodeText( $request, $text ) {
3588                 $text = rtrim( $text );
3589                 return $request->getBool( 'safemode' )
3590                         ? $this->unmakesafe( $text )
3591                         : $text;
3592         }
3593
3594         /**
3595          * Filter an output field through a Unicode armoring process if it is
3596          * going to an old browser with known broken Unicode editing issues.
3597          *
3598          * @param $text String
3599          * @return String
3600          * @private
3601          */
3602         function safeUnicodeOutput( $text ) {
3603                 global $wgContLang;
3604                 $codedText = $wgContLang->recodeForEdit( $text );
3605                 return $this->checkUnicodeCompliantBrowser()
3606                         ? $codedText
3607                         : $this->makesafe( $codedText );
3608         }
3609
3610         /**
3611          * A number of web browsers are known to corrupt non-ASCII characters
3612          * in a UTF-8 text editing environment. To protect against this,
3613          * detected browsers will be served an armored version of the text,
3614          * with non-ASCII chars converted to numeric HTML character references.
3615          *
3616          * Preexisting such character references will have a 0 added to them
3617          * to ensure that round-trips do not alter the original data.
3618          *
3619          * @param $invalue String
3620          * @return String
3621          * @private
3622          */
3623         function makesafe( $invalue ) {
3624                 // Armor existing references for reversibility.
3625                 $invalue = strtr( $invalue, array( "&#x" => "&#x0" ) );
3626
3627                 $bytesleft = 0;
3628                 $result = "";
3629                 $working = 0;
3630                 for ( $i = 0; $i < strlen( $invalue ); $i++ ) {
3631                         $bytevalue = ord( $invalue[$i] );
3632                         if ( $bytevalue <= 0x7F ) { // 0xxx xxxx
3633                                 $result .= chr( $bytevalue );
3634                                 $bytesleft = 0;
3635                         } elseif ( $bytevalue <= 0xBF ) { // 10xx xxxx
3636                                 $working = $working << 6;
3637                                 $working += ( $bytevalue & 0x3F );
3638                                 $bytesleft--;
3639                                 if ( $bytesleft <= 0 ) {
3640                                         $result .= "&#x" . strtoupper( dechex( $working ) ) . ";";
3641                                 }
3642                         } elseif ( $bytevalue <= 0xDF ) { // 110x xxxx
3643                                 $working = $bytevalue & 0x1F;
3644                                 $bytesleft = 1;
3645                         } elseif ( $bytevalue <= 0xEF ) { // 1110 xxxx
3646                                 $working = $bytevalue & 0x0F;
3647                                 $bytesleft = 2;
3648                         } else { // 1111 0xxx
3649                                 $working = $bytevalue & 0x07;
3650                                 $bytesleft = 3;
3651                         }
3652                 }
3653                 return $result;
3654         }
3655
3656         /**
3657          * Reverse the previously applied transliteration of non-ASCII characters
3658          * back to UTF-8. Used to protect data from corruption by broken web browsers
3659          * as listed in $wgBrowserBlackList.
3660          *
3661          * @param $invalue String
3662          * @return String
3663          * @private
3664          */
3665         function unmakesafe( $invalue ) {
3666                 $result = "";
3667                 for ( $i = 0; $i < strlen( $invalue ); $i++ ) {
3668                         if ( ( substr( $invalue, $i, 3 ) == "&#x" ) && ( $invalue[$i + 3] != '0' ) ) {
3669                                 $i += 3;
3670                                 $hexstring = "";
3671                                 do {
3672                                         $hexstring .= $invalue[$i];
3673                                         $i++;
3674                                 } while ( ctype_xdigit( $invalue[$i] ) && ( $i < strlen( $invalue ) ) );
3675
3676                                 // Do some sanity checks. These aren't needed for reversibility,
3677                                 // but should help keep the breakage down if the editor
3678                                 // breaks one of the entities whilst editing.
3679                                 if ( ( substr( $invalue, $i, 1 ) == ";" ) and ( strlen( $hexstring ) <= 6 ) ) {
3680                                         $codepoint = hexdec( $hexstring );
3681                                         $result .= codepointToUtf8( $codepoint );
3682                                 } else {
3683                                         $result .= "&#x" . $hexstring . substr( $invalue, $i, 1 );
3684                                 }
3685                         } else {
3686                                 $result .= substr( $invalue, $i, 1 );
3687                         }
3688                 }
3689                 // reverse the transform that we made for reversibility reasons.
3690                 return strtr( $result, array( "&#x0" => "&#x" ) );
3691         }
3692 }