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