includes/EditPage.php

   1 <?php
   2 /**
   3  * Contain the EditPage class
   4  * @package MediaWiki
   5  */
   6
   7 /**
   8  * Splitting edit page/HTML interface from Article...
   9  * The actual database and text munging is still in Article,
  10  * but it should get easier to call those from alternate
  11  * interfaces.
  12  *
  13  * @package MediaWiki
  14  */
  15
  16 class EditPage {
  17         var $mArticle;
  18         var $mTitle;
  19         var $mMetaData = '';
  20         var $isConflict = false;
  21         var $isCssJsSubpage = false;
  22         var $deletedSinceEdit = false;
  23         var $formtype;
  24         var $firsttime;
  25         var $lastDelete;
  26         var $mTokenOk = false;
  27         var $mTriedSave = false;
  28         var $tooBig = false;
  29         var $kblength = false;
  30         var $missingComment = false;
  31         var $missingSummary = false;
  32         var $allowBlankSummary = false;
  33         var $autoSumm = '';
  34         var $hookError = '';
  35
  36         # Form values
  37         var $save = false, $preview = false, $diff = false;
  38         var $minoredit = false, $watchthis = false, $recreate = false;
  39         var $textbox1 = '', $textbox2 = '', $summary = '';
  40         var $edittime = '', $section = '', $starttime = '';
  41         var $oldid = 0, $editintro = '', $scrolltop = null;
  42
  43         /**
  44          * @todo document
  45          * @param $article
  46          */
  47         function EditPage( $article ) {
  48                 $this->mArticle =& $article;
  49                 global $wgTitle;
  50                 $this->mTitle =& $wgTitle;
  51         }
  52
  53         /**
  54          * This is the function that extracts metadata from the article body on the first view.
  55          * To turn the feature on, set $wgUseMetadataEdit = true ; in LocalSettings
  56          *  and set $wgMetadataWhitelist to the *full* title of the template whitelist
  57          */
  58         function extractMetaDataFromArticle () {
  59                 global $wgUseMetadataEdit , $wgMetadataWhitelist , $wgLang ;
  60                 $this->mMetaData = '' ;
  61                 if ( !$wgUseMetadataEdit ) return ;
  62                 if ( $wgMetadataWhitelist == '' ) return ;
  63                 $s = '' ;
  64                 $t = $this->mArticle->getContent();
  65
  66                 # MISSING : <nowiki> filtering
  67
  68                 # Categories and language links
  69                 $t = explode ( "\n" , $t ) ;
  70                 $catlow = strtolower ( $wgLang->getNsText ( NS_CATEGORY ) ) ;
  71                 $cat = $ll = array() ;
  72                 foreach ( $t AS $key => $x )
  73                 {
  74                         $y = trim ( strtolower ( $x ) ) ;
  75                         while ( substr ( $y , 0 , 2 ) == '[[' )
  76                         {
  77                                 $y = explode ( ']]' , trim ( $x ) ) ;
  78                                 $first = array_shift ( $y ) ;
  79                                 $first = explode ( ':' , $first ) ;
  80                                 $ns = array_shift ( $first ) ;
  81                                 $ns = trim ( str_replace ( '[' , '' , $ns ) ) ;
  82                                 if ( strlen ( $ns ) == 2 OR strtolower ( $ns ) == $catlow )
  83                                 {
  84                                         $add = '[[' . $ns . ':' . implode ( ':' , $first ) . ']]' ;
  85                                         if ( strtolower ( $ns ) == $catlow ) $cat[] = $add ;
  86                                         else $ll[] = $add ;
  87                                         $x = implode ( ']]' , $y ) ;
  88                                         $t[$key] = $x ;
  89                                         $y = trim ( strtolower ( $x ) ) ;
  90                                 }
  91                         }
  92                 }
  93                 if ( count ( $cat ) ) $s .= implode ( ' ' , $cat ) . "\n" ;
  94                 if ( count ( $ll ) ) $s .= implode ( ' ' , $ll ) . "\n" ;
  95                 $t = implode ( "\n" , $t ) ;
  96
  97                 # Load whitelist
  98                 $sat = array () ; # stand-alone-templates; must be lowercase
  99                 $wl_title = Title::newFromText ( $wgMetadataWhitelist ) ;
 100                 $wl_article = new Article ( $wl_title ) ;
 101                 $wl = explode ( "\n" , $wl_article->getContent() ) ;
 102                 foreach ( $wl AS $x )
 103                 {
 104                         $isentry = false ;
 105                         $x = trim ( $x ) ;
 106                         while ( substr ( $x , 0 , 1 ) == '*' )
 107                         {
 108                                 $isentry = true ;
 109                                 $x = trim ( substr ( $x , 1 ) ) ;
 110                         }
 111                         if ( $isentry )
 112                         {
 113                                 $sat[] = strtolower ( $x ) ;
 114                         }
 115
 116                 }
 117
 118                 # Templates, but only some
 119                 $t = explode ( '{{' , $t ) ;
 120                 $tl = array () ;
 121                 foreach ( $t AS $key => $x )
 122                 {
 123                         $y = explode ( '}}' , $x , 2 ) ;
 124                         if ( count ( $y ) == 2 )
 125                         {
 126                                 $z = $y[0] ;
 127                                 $z = explode ( '|' , $z ) ;
 128                                 $tn = array_shift ( $z ) ;
 129                                 if ( in_array ( strtolower ( $tn ) , $sat ) )
 130                                 {
 131                                         $tl[] = '{{' . $y[0] . '}}' ;
 132                                         $t[$key] = $y[1] ;
 133                                         $y = explode ( '}}' , $y[1] , 2 ) ;
 134                                 }
 135                                 else $t[$key] = '{{' . $x ;
 136                         }
 137                         else if ( $key != 0 ) $t[$key] = '{{' . $x ;
 138                         else $t[$key] = $x ;
 139                 }
 140                 if ( count ( $tl ) ) $s .= implode ( ' ' , $tl ) ;
 141                 $t = implode ( '' , $t ) ;
 142
 143                 $t = str_replace ( "\n\n\n" , "\n" , $t ) ;
 144                 $this->mArticle->mContent = $t ;
 145                 $this->mMetaData = $s ;
 146         }
 147
 148         function submit() {
 149                 $this->edit();
 150         }
 151
 152         /**
 153          * This is the function that gets called for "action=edit". It
 154          * sets up various member variables, then passes execution to
 155          * another function, usually showEditForm()
 156          *
 157          * The edit form is self-submitting, so that when things like
 158          * preview and edit conflicts occur, we get the same form back
 159          * with the extra stuff added.  Only when the final submission
 160          * is made and all is well do we actually save and redirect to
 161          * the newly-edited page.
 162          */
 163         function edit() {
 164                 global $wgOut, $wgUser, $wgRequest, $wgTitle;
 165                 global $wgEmailConfirmToEdit;
 166
 167                 if ( ! wfRunHooks( 'AlternateEdit', array( &$this  ) ) )
 168                         return;
 169
 170                 $fname = 'EditPage::edit';
 171                 wfProfileIn( $fname );
 172                 wfDebug( "$fname: enter\n" );
 173
 174                 // this is not an article
 175                 $wgOut->setArticleFlag(false);
 176
 177                 $this->importFormData( $wgRequest );
 178                 $this->firsttime = false;
 179
 180                 if( $this->live ) {
 181                         $this->livePreview();
 182                         wfProfileOut( $fname );
 183                         return;
 184                 }
 185
 186                 if ( ! $this->mTitle->userCanEdit() ) {
 187                         wfDebug( "$fname: user can't edit\n" );
 188                         $wgOut->readOnlyPage( $this->mArticle->getContent(), true );
 189                         wfProfileOut( $fname );
 190                         return;
 191                 }
 192                 wfDebug( "$fname: Checking blocks\n" );
 193                 if ( !$this->preview && !$this->diff && $wgUser->isBlockedFrom( $this->mTitle, !$this->save ) ) {
 194                         # When previewing, don't check blocked state - will get caught at save time.
 195                         # Also, check when starting edition is done against slave to improve performance.
 196                         wfDebug( "$fname: user is blocked\n" );
 197                         $wgOut->blockedPage();
 198                         wfProfileOut( $fname );
 199                         return;
 200                 }
 201                 if ( !$wgUser->isAllowed('edit') ) {
 202                         if ( $wgUser->isAnon() ) {
 203                                 wfDebug( "$fname: user must log in\n" );
 204                                 $this->userNotLoggedInPage();
 205                                 wfProfileOut( $fname );
 206                                 return;
 207                         } else {
 208                                 wfDebug( "$fname: read-only page\n" );
 209                                 $wgOut->readOnlyPage( $this->mArticle->getContent(), true );
 210                                 wfProfileOut( $fname );
 211                                 return;
 212                         }
 213                 }
 214                 if ($wgEmailConfirmToEdit && !$wgUser->isEmailConfirmed()) {
 215                         wfDebug("$fname: user must confirm e-mail address\n");
 216                         $this->userNotConfirmedPage();
 217                         wfProfileOut($fname);
 218                         return;
 219                 }
 220                 if ( !$this->mTitle->userCan( 'create' ) && !$this->mTitle->exists() ) {
 221                         wfDebug( "$fname: no create permission\n" );
 222                         $this->noCreatePermission();
 223                         wfProfileOut( $fname );
 224                         return;
 225                 }
 226                 if ( wfReadOnly() ) {
 227                         wfDebug( "$fname: read-only mode is engaged\n" );
 228                         if( $this->save || $this->preview ) {
 229                                 $this->formtype = 'preview';
 230                         } else if ( $this->diff ) {
 231                                 $this->formtype = 'diff';
 232                         } else {
 233                                 $wgOut->readOnlyPage( $this->mArticle->getContent() );
 234                                 wfProfileOut( $fname );
 235                                 return;
 236                         }
 237                 } else {
 238                         if ( $this->save ) {
 239                                 $this->formtype = 'save';
 240                         } else if ( $this->preview ) {
 241                                 $this->formtype = 'preview';
 242                         } else if ( $this->diff ) {
 243                                 $this->formtype = 'diff';
 244                         } else { # First time through
 245                                 $this->firsttime = true;
 246                                 if( $this->previewOnOpen() ) {
 247                                         $this->formtype = 'preview';
 248                                 } else {
 249                                         $this->extractMetaDataFromArticle () ;
 250                                         $this->formtype = 'initial';
 251                                 }
 252                         }
 253                 }
 254
 255                 wfProfileIn( "$fname-business-end" );
 256
 257                 $this->isConflict = false;
 258                 // css / js subpages of user pages get a special treatment
 259                 $this->isCssJsSubpage      = $wgTitle->isCssJsSubpage();
 260                 $this->isValidCssJsSubpage = $wgTitle->isValidCssJsSubpage();
 261
 262                 /* Notice that we can't use isDeleted, because it returns true if article is ever deleted
 263                  * no matter it's current state
 264                  */
 265                 $this->deletedSinceEdit = false;
 266                 if ( $this->edittime != '' ) {
 267                         /* Note that we rely on logging table, which hasn't been always there,
 268                          * but that doesn't matter, because this only applies to brand new
 269                          * deletes. This is done on every preview and save request. Move it further down
 270                          * to only perform it on saves
 271                          */
 272                         if ( $this->mTitle->isDeleted() ) {
 273                                 $this->lastDelete = $this->getLastDelete();
 274                                 if ( !is_null($this->lastDelete) ) {
 275                                         $deletetime = $this->lastDelete->log_timestamp;
 276                                         if ( ($deletetime - $this->starttime) > 0 ) {
 277                                                 $this->deletedSinceEdit = true;
 278                                         }
 279                                 }
 280                         }
 281                 }
 282
 283                 if(!$this->mTitle->getArticleID() && ('initial' == $this->formtype || $this->firsttime )) { # new article
 284                         $this->showIntro();
 285                 }
 286                 if( $this->mTitle->isTalkPage() ) {
 287                         $wgOut->addWikiText( wfMsg( 'talkpagetext' ) );
 288                 }
 289
 290                 # Attempt submission here.  This will check for edit conflicts,
 291                 # and redundantly check for locked database, blocked IPs, etc.
 292                 # that edit() already checked just in case someone tries to sneak
 293                 # in the back door with a hand-edited submission URL.
 294
 295                 if ( 'save' == $this->formtype ) {
 296                         if ( !$this->attemptSave() ) {
 297                                 wfProfileOut( "$fname-business-end" );
 298                                 wfProfileOut( $fname );
 299                                 return;
 300                         }
 301                 }
 302
 303                 # First time through: get contents, set time for conflict
 304                 # checking, etc.
 305                 if ( 'initial' == $this->formtype || $this->firsttime ) {
 306                         $this->initialiseForm();
 307                 }
 308
 309                 $this->showEditForm();
 310                 wfProfileOut( "$fname-business-end" );
 311                 wfProfileOut( $fname );
 312         }
 313
 314         /**
 315          * Return true if this page should be previewed when the edit form
 316          * is initially opened.
 317          * @return bool
 318          * @private
 319          */
 320         function previewOnOpen() {
 321                 global $wgUser;
 322                 return $this->section != 'new' &&
 323                         ( ( $wgUser->getOption( 'previewonfirst' ) && $this->mTitle->exists() ) ||
 324                                 ( $this->mTitle->getNamespace() == NS_CATEGORY &&
 325                                         !$this->mTitle->exists() ) );
 326         }
 327
 328         /**
 329          * @todo document
 330          * @param $request
 331          */
 332         function importFormData( &$request ) {
 333                 global $wgLang, $wgUser;
 334                 $fname = 'EditPage::importFormData';
 335                 wfProfileIn( $fname );
 336
 337                 if( $request->wasPosted() ) {
 338                         # These fields need to be checked for encoding.
 339                         # Also remove trailing whitespace, but don't remove _initial_
 340                         # whitespace from the text boxes. This may be significant formatting.
 341                         $this->textbox1 = $this->safeUnicodeInput( $request, 'wpTextbox1' );
 342                         $this->textbox2 = $this->safeUnicodeInput( $request, 'wpTextbox2' );
 343                         $this->mMetaData = rtrim( $request->getText( 'metadata'   ) );
 344                         # Truncate for whole multibyte characters. +5 bytes for ellipsis
 345                         $this->summary   = $wgLang->truncate( $request->getText( 'wpSummary'  ), 250 );
 346
 347                         $this->edittime = $request->getVal( 'wpEdittime' );
 348                         $this->starttime = $request->getVal( 'wpStarttime' );
 349
 350                         $this->scrolltop = $request->getIntOrNull( 'wpScrolltop' );
 351
 352                         if( is_null( $this->edittime ) ) {
 353                                 # If the form is incomplete, force to preview.
 354                                 wfDebug( "$fname: Form data appears to be incomplete\n" );
 355                                 wfDebug( "POST DATA: " . var_export( $_POST, true ) . "\n" );
 356                                 $this->preview  = true;
 357                         } else {
 358                                 /* Fallback for live preview */
 359                                 $this->preview = $request->getCheck( 'wpPreview' ) || $request->getCheck( 'wpLivePreview' );
 360                                 $this->diff = $request->getCheck( 'wpDiff' );
 361
 362                                 // Remember whether a save was requested, so we can indicate
 363                                 // if we forced preview due to session failure.
 364                                 $this->mTriedSave = !$this->preview;
 365
 366                                 if ( $this->tokenOk( $request ) ) {
 367                                         # Some browsers will not report any submit button
 368                                         # if the user hits enter in the comment box.
 369                                         # The unmarked state will be assumed to be a save,
 370                                         # if the form seems otherwise complete.
 371                                         wfDebug( "$fname: Passed token check.\n" );
 372                                 } else {
 373                                         # Page might be a hack attempt posted from
 374                                         # an external site. Preview instead of saving.
 375                                         wfDebug( "$fname: Failed token check; forcing preview\n" );
 376                                         $this->preview = true;
 377                                 }
 378                         }
 379                         $this->save    = ! ( $this->preview OR $this->diff );
 380                         if( !preg_match( '/^\d{14}$/', $this->edittime )) {
 381                                 $this->edittime = null;
 382                         }
 383
 384                         if( !preg_match( '/^\d{14}$/', $this->starttime )) {
 385                                 $this->starttime = null;
 386                         }
 387
 388                         $this->recreate  = $request->getCheck( 'wpRecreate' );
 389
 390                         $this->minoredit = $request->getCheck( 'wpMinoredit' );
 391                         $this->watchthis = $request->getCheck( 'wpWatchthis' );
 392
 393                         # Don't force edit summaries when a user is editing their own user or talk page
 394                         if( ( $this->mTitle->mNamespace == NS_USER || $this->mTitle->mNamespace == NS_USER_TALK ) && $this->mTitle->getText() == $wgUser->getName() ) {
 395                                 $this->allowBlankSummary = true;
 396                         } else {
 397                                 $this->allowBlankSummary = $request->getBool( 'wpIgnoreBlankSummary' );
 398                         }
 399
 400                         $this->autoSumm = $request->getText( 'wpAutoSummary' );
 401                 } else {
 402                         # Not a posted form? Start with nothing.
 403                         wfDebug( "$fname: Not a posted form.\n" );
 404                         $this->textbox1  = '';
 405                         $this->textbox2  = '';
 406                         $this->mMetaData = '';
 407                         $this->summary   = '';
 408                         $this->edittime  = '';
 409                         $this->starttime = wfTimestampNow();
 410                         $this->preview   = false;
 411                         $this->save      = false;
 412                         $this->diff      = false;
 413                         $this->minoredit = false;
 414                         $this->watchthis = false;
 415                         $this->recreate  = false;
 416                 }
 417
 418                 $this->oldid = $request->getInt( 'oldid' );
 419
 420                 # Section edit can come from either the form or a link
 421                 $this->section = $request->getVal( 'wpSection', $request->getVal( 'section' ) );
 422
 423                 $this->live = $request->getCheck( 'live' );
 424                 $this->editintro = $request->getText( 'editintro' );
 425
 426                 wfProfileOut( $fname );
 427         }
 428
 429         /**
 430          * Make sure the form isn't faking a user's credentials.
 431          *
 432          * @param $request WebRequest
 433          * @return bool
 434          * @private
 435          */
 436         function tokenOk( &$request ) {
 437                 global $wgUser;
 438                 if( $wgUser->isAnon() ) {
 439                         # Anonymous users may not have a session
 440                         # open. Don't tokenize.
 441                         $this->mTokenOk = true;
 442                 } else {
 443                         $this->mTokenOk = $wgUser->matchEditToken( $request->getVal( 'wpEditToken' ) );
 444                 }
 445                 return $this->mTokenOk;
 446         }
 447
 448         /** */
 449         function showIntro() {
 450                 global $wgOut, $wgUser;
 451                 $addstandardintro=true;
 452                 if($this->editintro) {
 453                         $introtitle=Title::newFromText($this->editintro);
 454                         if(isset($introtitle) && $introtitle->userCanRead()) {
 455                                 $rev=Revision::newFromTitle($introtitle);
 456                                 if($rev) {
 457                                         $wgOut->addSecondaryWikiText($rev->getText());
 458                                         $addstandardintro=false;
 459                                 }
 460                         }
 461                 }
 462                 if($addstandardintro) {
 463                         if ( $wgUser->isLoggedIn() )
 464                                 $wgOut->addWikiText( wfMsg( 'newarticletext' ) );
 465                         else
 466                                 $wgOut->addWikiText( wfMsg( 'newarticletextanon' ) );
 467                 }
 468         }
 469
 470         /**
 471          * Attempt submission
 472          * @return bool false if output is done, true if the rest of the form should be displayed
 473          */
 474         function attemptSave() {
 475                 global $wgSpamRegex, $wgFilterCallback, $wgUser, $wgOut;
 476                 global $wgMaxArticleSize;
 477
 478                 $fname = 'EditPage::attemptSave';
 479                 wfProfileIn( $fname );
 480                 wfProfileIn( "$fname-checks" );
 481
 482                 # Reintegrate metadata
 483                 if ( $this->mMetaData != '' ) $this->textbox1 .= "\n" . $this->mMetaData ;
 484                 $this->mMetaData = '' ;
 485
 486                 # Check for spam
 487                 if ( $wgSpamRegex && preg_match( $wgSpamRegex, $this->textbox1, $matches ) ) {
 488                         $this->spamPage ( $matches[0] );
 489                         wfProfileOut( "$fname-checks" );
 490                         wfProfileOut( $fname );
 491                         return false;
 492                 }
 493                 if ( $wgFilterCallback && $wgFilterCallback( $this->mTitle, $this->textbox1, $this->section ) ) {
 494                         # Error messages or other handling should be performed by the filter function
 495                         wfProfileOut( $fname );
 496                         wfProfileOut( "$fname-checks" );
 497                         return false;
 498                 }
 499                 if ( !wfRunHooks( 'EditFilter', array( $this, $this->textbox1, $this->section, &$this->hookError ) ) ) {
 500                         # Error messages etc. could be handled within the hook...
 501                         wfProfileOut( $fname );
 502                         wfProfileOut( "$fname-checks" );
 503                         return false;
 504                 } elseif( $this->hookError != '' ) {
 505                         # ...or the hook could be expecting us to produce an error
 506                         wfProfileOut( "$fname-checks " );
 507                         wfProfileOut( $fname );
 508                         return true;
 509                 }
 510                 if ( $wgUser->isBlockedFrom( $this->mTitle, false ) ) {
 511                         # Check block state against master, thus 'false'.
 512                         $this->blockedIPpage();
 513                         wfProfileOut( "$fname-checks" );
 514                         wfProfileOut( $fname );
 515                         return false;
 516                 }
 517                 $this->kblength = (int)(strlen( $this->textbox1 ) / 1024);
 518                 if ( $this->kblength > $wgMaxArticleSize ) {
 519                         // Error will be displayed by showEditForm()
 520                         $this->tooBig = true;
 521                         wfProfileOut( "$fname-checks" );
 522                         wfProfileOut( $fname );
 523                         return true;
 524                 }
 525
 526                 if ( !$wgUser->isAllowed('edit') ) {
 527                         if ( $wgUser->isAnon() ) {
 528                                 $this->userNotLoggedInPage();
 529                                 wfProfileOut( "$fname-checks" );
 530                                 wfProfileOut( $fname );
 531                                 return false;
 532                         }
 533                         else {
 534                                 $wgOut->readOnlyPage();
 535                                 wfProfileOut( "$fname-checks" );
 536                                 wfProfileOut( $fname );
 537                                 return false;
 538                         }
 539                 }
 540
 541                 if ( wfReadOnly() ) {
 542                         $wgOut->readOnlyPage();
 543                         wfProfileOut( "$fname-checks" );
 544                         wfProfileOut( $fname );
 545                         return false;
 546                 }
 547                 if ( $wgUser->pingLimiter() ) {
 548                         $wgOut->rateLimited();
 549                         wfProfileOut( "$fname-checks" );
 550                         wfProfileOut( $fname );
 551                         return false;
 552                 }
 553
 554                 # If the article has been deleted while editing, don't save it without
 555                 # confirmation
 556                 if ( $this->deletedSinceEdit && !$this->recreate ) {
 557                         wfProfileOut( "$fname-checks" );
 558                         wfProfileOut( $fname );
 559                         return true;
 560                 }
 561
 562                 wfProfileOut( "$fname-checks" );
 563
 564                 # If article is new, insert it.
 565                 $aid = $this->mTitle->getArticleID( GAID_FOR_UPDATE );
 566                 if ( 0 == $aid ) {
 567                         // Late check for create permission, just in case *PARANOIA*
 568                         if ( !$this->mTitle->userCan( 'create' ) ) {
 569                                 wfDebug( "$fname: no create permission\n" );
 570                                 $this->noCreatePermission();
 571                                 wfProfileOut( $fname );
 572                                 return;
 573                         }
 574
 575                         # Don't save a new article if it's blank.
 576                         if ( ( '' == $this->textbox1 ) ) {
 577                                         $wgOut->redirect( $this->mTitle->getFullURL() );
 578                                         wfProfileOut( $fname );
 579                                         return false;
 580                         }
 581
 582                         # If no edit comment was given when creating a new page, and what's being
 583                         # created is a redirect, be smart and fill in a neat auto-comment
 584                         if( $this->summary == '' ) {
 585                                 $rt = Title::newFromRedirect( $this->textbox1 );
 586                                 if( is_object( $rt ) )
 587                                         $this->summary = wfMsgForContent( 'autoredircomment', $rt->getPrefixedText() );
 588                         }
 589
 590                         $isComment=($this->section=='new');
 591                         $this->mArticle->insertNewArticle( $this->textbox1, $this->summary,
 592                                 $this->minoredit, $this->watchthis, false, $isComment);
 593
 594                         wfProfileOut( $fname );
 595                         return false;
 596                 }
 597
 598                 # Article exists. Check for edit conflict.
 599
 600                 $this->mArticle->clear(); # Force reload of dates, etc.
 601                 $this->mArticle->forUpdate( true ); # Lock the article
 602
 603                 if( $this->mArticle->getTimestamp() != $this->edittime ) {
 604                         $this->isConflict = true;
 605                         if( $this->section == 'new' ) {
 606                                 if( $this->mArticle->getUserText() == $wgUser->getName() &&
 607                                         $this->mArticle->getComment() == $this->summary ) {
 608                                         // Probably a duplicate submission of a new comment.
 609                                         // This can happen when squid resends a request after
 610                                         // a timeout but the first one actually went through.
 611                                         wfDebug( "EditPage::editForm duplicate new section submission; trigger edit conflict!\n" );
 612                                 } else {
 613                                         // New comment; suppress conflict.
 614                                         $this->isConflict = false;
 615                                         wfDebug( "EditPage::editForm conflict suppressed; new section\n" );
 616                                 }
 617                         }
 618                 }
 619                 $userid = $wgUser->getID();
 620
 621                 if ( $this->isConflict) {
 622                         wfDebug( "EditPage::editForm conflict! getting section '$this->section' for time '$this->edittime' (article time '" .
 623                                 $this->mArticle->getTimestamp() . "'\n" );
 624                         $text = $this->mArticle->replaceSection( $this->section, $this->textbox1, $this->summary, $this->edittime);
 625                 }
 626                 else {
 627                         wfDebug( "EditPage::editForm getting section '$this->section'\n" );
 628                         $text = $this->mArticle->replaceSection( $this->section, $this->textbox1, $this->summary);
 629                 }
 630                 if( is_null( $text ) ) {
 631                         wfDebug( "EditPage::editForm activating conflict; section replace failed.\n" );
 632                         $this->isConflict = true;
 633                         $text = $this->textbox1;
 634                 }
 635
 636                 # Suppress edit conflict with self, except for section edits where merging is required.
 637                 if ( ( $this->section == '' ) && ( 0 != $userid ) && ( $this->mArticle->getUser() == $userid ) ) {
 638                         wfDebug( "Suppressing edit conflict, same user.\n" );
 639                         $this->isConflict = false;
 640                 } else {
 641                         # switch from section editing to normal editing in edit conflict
 642                         if($this->isConflict) {
 643                                 # Attempt merge
 644                                 if( $this->mergeChangesInto( $text ) ){
 645                                         // Successful merge! Maybe we should tell the user the good news?
 646                                         $this->isConflict = false;
 647                                         wfDebug( "Suppressing edit conflict, successful merge.\n" );
 648                                 } else {
 649                                         $this->section = '';
 650                                         $this->textbox1 = $text;
 651                                         wfDebug( "Keeping edit conflict, failed merge.\n" );
 652                                 }
 653                         }
 654                 }
 655
 656                 if ( $this->isConflict ) {
 657                         wfProfileOut( $fname );
 658                         return true;
 659                 }
 660
 661                 # If no edit comment was given when turning a page into a redirect, be smart
 662                 # and fill in a neat auto-comment
 663                 if( $this->summary == '' ) {
 664                         $rt = Title::newFromRedirect( $this->textbox1 );
 665                         if( is_object( $rt ) )
 666                                 $this->summary = wfMsgForContent( 'autoredircomment', $rt->getPrefixedText() );
 667                 }
 668
 669                 # Handle the user preference to force summaries here
 670                 if( $this->section != 'new' && !$this->allowBlankSummary && $wgUser->getOption( 'forceeditsummary' ) ) {
 671                         if( md5( $this->summary ) == $this->autoSumm ) {
 672                                 $this->missingSummary = true;
 673                                 wfProfileOut( $fname );
 674                                 return( true );
 675                         }
 676                 }
 677
 678                 # All's well
 679                 wfProfileIn( "$fname-sectionanchor" );
 680                 $sectionanchor = '';
 681                 if( $this->section == 'new' ) {
 682                         if ( $this->textbox1 == '' ) {
 683                                 $this->missingComment = true;
 684                                 return true;
 685                         }
 686                         if( $this->summary != '' ) {
 687                                 $sectionanchor = $this->sectionAnchor( $this->summary );
 688                         }
 689                 } elseif( $this->section != '' ) {
 690                         # Try to get a section anchor from the section source, redirect to edited section if header found
 691                         # XXX: might be better to integrate this into Article::replaceSection
 692                         # for duplicate heading checking and maybe parsing
 693                         $hasmatch = preg_match( "/^ *([=]{1,6})(.*?)(\\1) *\\n/i", $this->textbox1, $matches );
 694                         # we can't deal with anchors, includes, html etc in the header for now,
 695                         # headline would need to be parsed to improve this
 696                         if($hasmatch and strlen($matches[2]) > 0) {
 697                                 $sectionanchor = $this->sectionAnchor( $matches[2] );
 698                         }
 699                 }
 700                 wfProfileOut( "$fname-sectionanchor" );
 701
 702                 // Save errors may fall down to the edit form, but we've now
 703                 // merged the section into full text. Clear the section field
 704                 // so that later submission of conflict forms won't try to
 705                 // replace that into a duplicated mess.
 706                 $this->textbox1 = $text;
 707                 $this->section = '';
 708
 709                 // Check for length errors again now that the section is merged in
 710                 $this->kblength = (int)(strlen( $text ) / 1024);
 711                 if ( $this->kblength > $wgMaxArticleSize ) {
 712                         $this->tooBig = true;
 713                         wfProfileOut( $fname );
 714                         return true;
 715                 }
 716
 717                 # update the article here
 718                 if( $this->mArticle->updateArticle( $text, $this->summary, $this->minoredit,
 719                         $this->watchthis, '', $sectionanchor ) ) {
 720                         wfProfileOut( $fname );
 721                         return false;
 722                 } else {
 723                         $this->isConflict = true;
 724                 }
 725                 wfProfileOut( $fname );
 726                 return true;
 727         }
 728
 729         /**
 730          * Initialise form fields in the object
 731          * Called on the first invocation, e.g. when a user clicks an edit link
 732          */
 733         function initialiseForm() {
 734                 $this->edittime = $this->mArticle->getTimestamp();
 735                 $this->textbox1 = $this->mArticle->getContent();
 736                 $this->summary = '';
 737                 if ( !$this->mArticle->exists() && $this->mArticle->mTitle->getNamespace() == NS_MEDIAWIKI )
 738                         $this->textbox1 = wfMsgWeirdKey ( $this->mArticle->mTitle->getText() ) ;
 739                 wfProxyCheck();
 740         }
 741
 742         /**
 743          * Send the edit form and related headers to $wgOut
 744          * @param $formCallback Optional callable that takes an OutputPage
 745          *                      parameter; will be called during form output
 746          *                      near the top, for captchas and the like.
 747          */
 748         function showEditForm( $formCallback=null ) {
 749                 global $wgOut, $wgUser, $wgLang, $wgContLang, $wgMaxArticleSize;
 750
 751                 $fname = 'EditPage::showEditForm';
 752                 wfProfileIn( $fname );
 753
 754                 $sk =& $wgUser->getSkin();
 755
 756                 wfRunHooks( 'EditPage::showEditForm:initial', array( &$this ) ) ;
 757
 758                 $wgOut->setRobotpolicy( 'noindex,nofollow' );
 759
 760                 # Enabled article-related sidebar, toplinks, etc.
 761                 $wgOut->setArticleRelated( true );
 762
 763                 if ( $this->isConflict ) {
 764                         $s = wfMsg( 'editconflict', $this->mTitle->getPrefixedText() );
 765                         $wgOut->setPageTitle( $s );
 766                         $wgOut->addWikiText( wfMsg( 'explainconflict' ) );
 767
 768                         $this->textbox2 = $this->textbox1;
 769                         $this->textbox1 = $this->mArticle->getContent();
 770                         $this->edittime = $this->mArticle->getTimestamp();
 771                 } else {
 772
 773                         if( $this->section != '' ) {
 774                                 if( $this->section == 'new' ) {
 775                                         $s = wfMsg('editingcomment', $this->mTitle->getPrefixedText() );
 776                                 } else {
 777                                         $s = wfMsg('editingsection', $this->mTitle->getPrefixedText() );
 778                                         if( !$this->preview && !$this->diff ) {
 779                                                 preg_match( "/^(=+)(.+)\\1/mi",
 780                                                         $this->textbox1,
 781                                                         $matches );
 782                                                 if( !empty( $matches[2] ) ) {
 783                                                         $this->summary = "/* ". trim($matches[2])." */ ";
 784                                                 }
 785                                         }
 786                                 }
 787                         } else {
 788                                 $s = wfMsg( 'editing', $this->mTitle->getPrefixedText() );
 789                         }
 790                         $wgOut->setPageTitle( $s );
 791
 792                         if ( $this->missingComment ) {
 793                                 $wgOut->addWikiText( wfMsg( 'missingcommenttext' ) );
 794                         }
 795
 796                         if( $this->missingSummary ) {
 797                                 $wgOut->addWikiText( wfMsg( 'missingsummary' ) );
 798                         }
 799
 800                         if( !$this->hookError == '' ) {
 801                                 $wgOut->addWikiText( $this->hookError );
 802                         }
 803
 804                         if ( !$this->checkUnicodeCompliantBrowser() ) {
 805                                 $wgOut->addWikiText( wfMsg( 'nonunicodebrowser') );
 806                         }
 807                         if ( isset( $this->mArticle )
 808                              && isset( $this->mArticle->mRevision )
 809                              && !$this->mArticle->mRevision->isCurrent() ) {
 810                                 $this->mArticle->setOldSubtitle( $this->mArticle->mRevision->getId() );
 811                                 $wgOut->addWikiText( wfMsg( 'editingold' ) );
 812                         }
 813                 }
 814
 815                 if( wfReadOnly() ) {
 816                         $wgOut->addWikiText( wfMsg( 'readonlywarning' ) );
 817                 } elseif( $wgUser->isAnon() && $this->formtype != 'preview' ) {
 818                         $wgOut->addWikiText( wfMsg( 'anoneditwarning' ) );
 819                 } else {
 820                         if( $this->isCssJsSubpage && $this->formtype != 'preview' ) {
 821                                 # Check the skin exists
 822                                 if( $this->isValidCssJsSubpage ) {
 823                                         $wgOut->addWikiText( wfMsg( 'usercssjsyoucanpreview' ) );
 824                                 } else {
 825                                         $wgOut->addWikiText( wfMsg( 'userinvalidcssjstitle', $this->mTitle->getSkinFromCssJsSubpage() ) );
 826                                 }
 827                         }
 828                 }
 829
 830                 if( $this->mTitle->isProtected( 'edit' ) ) {
 831                         # Is the protection due to the namespace, e.g. interface text?
 832                         if( $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 833                                 # Yes; remind the user
 834                                 $notice = wfMsg( 'editinginterface' );
 835                         } elseif( $this->mTitle->isSemiProtected() ) {
 836                                 # No; semi protected
 837                                 $notice = wfMsg( 'semiprotectedpagewarning' );
 838                                 if( wfEmptyMsg( 'semiprotectedpagewarning', $notice ) || $notice == '-' ) {
 839                                         $notice = '';
 840                                 }
 841                         } else {
 842                                 # No; regular protection
 843                                 $notice = wfMsg( 'protectedpagewarning' );
 844                         }
 845                         $wgOut->addWikiText( $notice );
 846                 }
 847
 848                 if ( $this->kblength === false ) {
 849                         $this->kblength = (int)(strlen( $this->textbox1 ) / 1024);
 850                 }
 851                 if ( $this->tooBig || $this->kblength > $wgMaxArticleSize ) {
 852                         $wgOut->addWikiText( wfMsg( 'longpageerror', $wgLang->formatNum( $this->kblength ), $wgMaxArticleSize ) );
 853                 } elseif( $this->kblength > 29 ) {
 854                         $wgOut->addWikiText( wfMsg( 'longpagewarning', $wgLang->formatNum( $this->kblength ) ) );
 855                 }
 856
 857                 $rows = $wgUser->getIntOption( 'rows' );
 858                 $cols = $wgUser->getIntOption( 'cols' );
 859
 860                 $ew = $wgUser->getOption( 'editwidth' );
 861                 if ( $ew ) $ew = " style=\"width:100%\"";
 862                 else $ew = '';
 863
 864                 $q = 'action=submit';
 865                 #if ( "no" == $redirect ) { $q .= "&redirect=no"; }
 866                 $action = $this->mTitle->escapeLocalURL( $q );
 867
 868                 $summary = wfMsg('summary');
 869                 $subject = wfMsg('subject');
 870                 $minor   = wfMsgExt('minoredit', array('parseinline'));
 871                 $watchthis = wfMsgExt('watchthis', array('parseinline'));
 872
 873                 $cancel = $sk->makeKnownLink( $this->mTitle->getPrefixedText(),
 874                                 wfMsgExt('cancel', array('parseinline')) );
 875                 $edithelpurl = $sk->makeInternalOrExternalUrl( wfMsgForContent( 'edithelppage' ));
 876                 $edithelp = '<a target="helpwindow" href="'.$edithelpurl.'">'.
 877                         htmlspecialchars( wfMsg( 'edithelp' ) ).'</a> '.
 878                         htmlspecialchars( wfMsg( 'newwindow' ) );
 879
 880                 global $wgRightsText;
 881                 $copywarn = "<div id=\"editpage-copywarn\">\n" .
 882                         wfMsg( $wgRightsText ? 'copyrightwarning' : 'copyrightwarning2',
 883                                 '[[' . wfMsgForContent( 'copyrightpage' ) . ']]',
 884                                 $wgRightsText ) . "\n</div>";
 885
 886                 if( $wgUser->getOption('showtoolbar') and !$this->isCssJsSubpage ) {
 887                         # prepare toolbar for edit buttons
 888                         $toolbar = $this->getEditToolbar();
 889                 } else {
 890                         $toolbar = '';
 891                 }
 892
 893                 // activate checkboxes if user wants them to be always active
 894                 if( !$this->preview && !$this->diff ) {
 895                         # Sort out the "watch" checkbox
 896                         if( $wgUser->getOption( 'watchdefault' ) ) {
 897                                 # Watch all edits
 898                                 $this->watchthis = true;
 899                         } elseif( $wgUser->getOption( 'watchcreations' ) && !$this->mTitle->exists() ) {
 900                                 # Watch creations
 901                                 $this->watchthis = true;
 902                         } elseif( $this->mTitle->userIsWatching() ) {
 903                                 # Already watched
 904                                 $this->watchthis = true;
 905                         }
 906
 907                         if( $wgUser->getOption( 'minordefault' ) ) $this->minoredit = true;
 908                 }
 909
 910                 $minoredithtml = '';
 911
 912                 if ( $wgUser->isAllowed('minoredit') ) {
 913                         $minoredithtml =
 914                                 "<input tabindex='3' type='checkbox' value='1' name='wpMinoredit'".($this->minoredit?" checked='checked'":"").
 915                                 " accesskey='".wfMsg('accesskey-minoredit')."' id='wpMinoredit' />\n".
 916                                 "<label for='wpMinoredit' title='".wfMsg('tooltip-minoredit')."'>{$minor}</label>\n";
 917                 }
 918
 919                 $watchhtml = '';
 920
 921                 if ( $wgUser->isLoggedIn() ) {
 922                         $watchhtml = "<input tabindex='4' type='checkbox' name='wpWatchthis'".
 923                                 ($this->watchthis?" checked='checked'":"").
 924                                 " accesskey=\"".htmlspecialchars(wfMsg('accesskey-watch'))."\" id='wpWatchthis'  />\n".
 925                                 "<label for='wpWatchthis' title=\"" .
 926                                         htmlspecialchars(wfMsg('tooltip-watch'))."\">{$watchthis}</label>\n";
 927                 }
 928
 929                 $checkboxhtml = $minoredithtml . $watchhtml;
 930
 931                 if ( $wgUser->getOption( 'previewontop' ) ) {
 932
 933                         if ( 'preview' == $this->formtype ) {
 934                                 $this->showPreview();
 935                         } else {
 936                                 $wgOut->addHTML( '<div id="wikiPreview"></div>' );
 937                         }
 938
 939                         if ( 'diff' == $this->formtype ) {
 940                                 $wgOut->addHTML( $this->getDiff() );
 941                         }
 942                 }
 943
 944
 945                 # if this is a comment, show a subject line at the top, which is also the edit summary.
 946                 # Otherwise, show a summary field at the bottom
 947                 $summarytext = htmlspecialchars( $wgContLang->recodeForEdit( $this->summary ) ); # FIXME
 948                 if( $this->section == 'new' ) {
 949                         $commentsubject="<span id='wpSummaryLabel'><label for='wpSummary'>{$subject}:</label></span>\n<div class='editOptions'>\n<input tabindex='1' type='text' value=\"$summarytext\" name='wpSummary' id='wpSummary' maxlength='200' size='60' /><br />";
 950                         $editsummary = '';
 951                 } else {
 952                         $commentsubject = '';
 953                         $editsummary="<span id='wpSummaryLabel'><label for='wpSummary'>{$summary}:</label></span>\n<div class='editOptions'>\n<input tabindex='2' type='text' value=\"$summarytext\" name='wpSummary' id='wpSummary' maxlength='200' size='60' /><br />";
 954                 }
 955
 956                 # Set focus to the edit box on load, except on preview or diff, where it would interfere with the display
 957                 if( !$this->preview && !$this->diff ) {
 958                         $wgOut->setOnloadHandler( 'document.editform.wpTextbox1.focus()' );
 959                 }
 960                 $templates = $this->formatTemplates();
 961
 962                 global $wgUseMetadataEdit ;
 963                 if ( $wgUseMetadataEdit ) {
 964                         $metadata = $this->mMetaData ;
 965                         $metadata = htmlspecialchars( $wgContLang->recodeForEdit( $metadata ) ) ;
 966                         $top = wfMsgWikiHtml( 'metadata_help' );
 967                         $metadata = $top . "<textarea name='metadata' rows='3' cols='{$cols}'{$ew}>{$metadata}</textarea>" ;
 968                 }
 969                 else $metadata = "" ;
 970
 971                 $hidden = '';
 972                 $recreate = '';
 973                 if ($this->deletedSinceEdit) {
 974                         if ( 'save' != $this->formtype ) {
 975                                 $wgOut->addWikiText( wfMsg('deletedwhileediting'));
 976                         } else {
 977                                 // Hide the toolbar and edit area, use can click preview to get it back
 978                                 // Add an confirmation checkbox and explanation.
 979                                 $toolbar = '';
 980                                 $hidden = 'type="hidden" style="display:none;"';
 981                                 $recreate = $wgOut->parse( wfMsg( 'confirmrecreate',  $this->lastDelete->user_name , $this->lastDelete->log_comment ));
 982                                 $recreate .=
 983                                         "<br /><input tabindex='1' type='checkbox' value='1' name='wpRecreate' id='wpRecreate' />".
 984                                         "<label for='wpRecreate' title='".wfMsg('tooltip-recreate')."'>". wfMsg('recreate')."</label>";
 985                         }
 986                 }
 987
 988                 $temp = array(
 989                         'id'        => 'wpSave',
 990                         'name'      => 'wpSave',
 991                         'type'      => 'submit',
 992                         'tabindex'  => '5',
 993                         'value'     => wfMsg('savearticle'),
 994                         'accesskey' => wfMsg('accesskey-save'),
 995                         'title'     => wfMsg('tooltip-save'),
 996                 );
 997                 $buttons['save'] = wfElement('input', $temp, '');
 998                 $temp = array(
 999                         'id'        => 'wpDiff',
1000                         'name'      => 'wpDiff',
1001                         'type'      => 'submit',
1002                         'tabindex'  => '7',
1003                         'value'     => wfMsg('showdiff'),
1004                         'accesskey' => wfMsg('accesskey-diff'),
1005                         'title'     => wfMsg('tooltip-diff'),
1006                 );
1007                 $buttons['diff'] = wfElement('input', $temp, '');
1008
1009                 global $wgLivePreview;
1010                 if ( $wgLivePreview && $wgUser->getOption( 'uselivepreview' ) ) {
1011                         $temp = array(
1012                                 'id'        => 'wpPreview',
1013                                 'name'      => 'wpPreview',
1014                                 'type'      => 'submit',
1015                                 'tabindex'  => '6',
1016                                 'value'     => wfMsg('showpreview'),
1017                                 'accesskey' => '',
1018                                 'title'     => wfMsg('tooltip-preview'),
1019                                 'style'     => 'display: none;',
1020                         );
1021                         $buttons['preview'] = wfElement('input', $temp, '');
1022                         $temp = array(
1023                                 'id'        => 'wpLivePreview',
1024                                 'name'      => 'wpLivePreview',
1025                                 'type'      => 'submit',
1026                                 'tabindex'  => '6',
1027                                 'value'     => wfMsg('showlivepreview'),
1028                                 'accesskey' => wfMsg('accesskey-preview'),
1029                                 'title'     => '',
1030                                 'onclick'   => $this->doLivePreviewScript(),
1031                         );
1032                         $buttons['live'] = wfElement('input', $temp, '');
1033                 } else {
1034                         $temp = array(
1035                                 'id'        => 'wpPreview',
1036                                 'name'      => 'wpPreview',
1037                                 'type'      => 'submit',
1038                                 'tabindex'  => '6',
1039                                 'value'     => wfMsg('showpreview'),
1040                                 'accesskey' => wfMsg('accesskey-preview'),
1041                                 'title'     => wfMsg('tooltip-preview'),
1042                         );
1043                         $buttons['preview'] = wfElement('input', $temp, '');
1044                         $buttons['live'] = '';
1045                 }
1046
1047                 $safemodehtml = $this->checkUnicodeCompliantBrowser()
1048                         ? ""
1049                         : "<input type='hidden' name=\"safemode\" value='1' />\n";
1050
1051                 $wgOut->addHTML( <<<END
1052 {$toolbar}
1053 <form id="editform" name="editform" method="post" action="$action" enctype="multipart/form-data">
1054 END
1055 );
1056
1057                 if( is_callable( $formCallback ) ) {
1058                         call_user_func_array( $formCallback, array( &$wgOut ) );
1059                 }
1060
1061                 // Put these up at the top to ensure they aren't lost on early form submission
1062                 $wgOut->addHTML( "
1063 <input type='hidden' value=\"" . htmlspecialchars( $this->section ) . "\" name=\"wpSection\" />
1064 <input type='hidden' value=\"{$this->starttime}\" name=\"wpStarttime\" />\n
1065 <input type='hidden' value=\"{$this->edittime}\" name=\"wpEdittime\" />\n
1066 <input type='hidden' value=\"{$this->scrolltop}\" name=\"wpScrolltop\" id=\"wpScrolltop\" />\n" );
1067
1068                 $wgOut->addHTML( <<<END
1069 $recreate
1070 {$commentsubject}
1071 <textarea tabindex='1' accesskey="," name="wpTextbox1" id="wpTextbox1" rows='{$rows}'
1072 cols='{$cols}'{$ew} $hidden>
1073 END
1074 . htmlspecialchars( $this->safeUnicodeOutput( $this->textbox1 ) ) .
1075 "
1076 </textarea>
1077                 " );
1078
1079                 $wgOut->addWikiText( $copywarn );
1080                 $wgOut->addHTML( "
1081 {$metadata}
1082 {$editsummary}
1083 {$checkboxhtml}
1084 {$safemodehtml}
1085 ");
1086
1087                 $wgOut->addHTML(
1088 "<div class='editButtons'>
1089         {$buttons['save']}
1090         {$buttons['preview']}
1091         {$buttons['live']}
1092         {$buttons['diff']}
1093         <span class='editHelp'>{$cancel} | {$edithelp}</span>
1094 </div><!-- editButtons -->
1095 </div><!-- editOptions -->");
1096
1097                 $wgOut->addWikiText( wfMsgForContent( 'edittools' ) );
1098
1099                 $wgOut->addHTML( "
1100 <div class='templatesUsed'>
1101 {$templates}
1102 </div>
1103 " );
1104
1105                 if ( $wgUser->isLoggedIn() ) {
1106                         /**
1107                          * To make it harder for someone to slip a user a page
1108                          * which submits an edit form to the wiki without their
1109                          * knowledge, a random token is associated with the login
1110                          * session. If it's not passed back with the submission,
1111                          * we won't save the page, or render user JavaScript and
1112                          * CSS previews.
1113                          */
1114                         $token = htmlspecialchars( $wgUser->editToken() );
1115                         $wgOut->addHTML( "\n<input type='hidden' value=\"$token\" name=\"wpEditToken\" />\n" );
1116                 }
1117
1118                 # If a blank edit summary was previously provided, and the appropriate
1119                 # user preference is active, pass a hidden tag here. This will stop the
1120                 # user being bounced back more than once in the event that a summary
1121                 # is not required.
1122                 if( $this->missingSummary ) {
1123                         $wgOut->addHTML( "<input type=\"hidden\" name=\"wpIgnoreBlankSummary\" value=\"1\" />\n" );
1124                 }
1125
1126                 # For a bit more sophisticated detection of blank summaries, hash the
1127                 # automatic one and pass that in a hidden field.
1128                 $autosumm = $this->autoSumm ? $this->autoSumm : md5( $this->summary );
1129                 $wgOut->addHtml( wfHidden( 'wpAutoSummary', $autosumm ) );
1130
1131                 if ( $this->isConflict ) {
1132                         require_once( "DifferenceEngine.php" );
1133                         $wgOut->addWikiText( '==' . wfMsg( "yourdiff" ) . '==' );
1134
1135                         $de = new DifferenceEngine( $this->mTitle );
1136                         $de->setText( $this->textbox2, $this->textbox1 );
1137                         $de->showDiff( wfMsg( "yourtext" ), wfMsg( "storedversion" ) );
1138
1139                         $wgOut->addWikiText( '==' . wfMsg( "yourtext" ) . '==' );
1140                         $wgOut->addHTML( "<textarea tabindex=6 id='wpTextbox2' name=\"wpTextbox2\" rows='{$rows}' cols='{$cols}' wrap='virtual'>"
1141                                 . htmlspecialchars( $this->safeUnicodeOutput( $this->textbox2 ) ) . "\n</textarea>" );
1142                 }
1143                 $wgOut->addHTML( "</form>\n" );
1144                 if ( !$wgUser->getOption( 'previewontop' ) ) {
1145
1146                         if ( $this->formtype == 'preview') {
1147                                 $this->showPreview();
1148                         } else {
1149                                 $wgOut->addHTML( '<div id="wikiPreview"></div>' );
1150                         }
1151
1152                         if ( $this->formtype == 'diff') {
1153                                 $wgOut->addHTML( $this->getDiff() );
1154                         }
1155
1156                 }
1157
1158                 wfProfileOut( $fname );
1159         }
1160
1161         /**
1162          * Append preview output to $wgOut.
1163          * Includes category rendering if this is a category page.
1164          * @private
1165          */
1166         function showPreview() {
1167                 global $wgOut;
1168                 $wgOut->addHTML( '<div id="wikiPreview">' );
1169                 if($this->mTitle->getNamespace() == NS_CATEGORY) {
1170                         $this->mArticle->openShowCategory();
1171                 }
1172                 $previewOutput = $this->getPreviewText();
1173                 $wgOut->addHTML( $previewOutput );
1174                 if($this->mTitle->getNamespace() == NS_CATEGORY) {
1175                         $this->mArticle->closeShowCategory();
1176                 }
1177                 $wgOut->addHTML( "<br style=\"clear:both;\" />\n" );
1178                 $wgOut->addHTML( '</div>' );
1179         }
1180
1181         /**
1182          * Prepare a list of templates used by this page. Returns HTML.
1183          */
1184         function formatTemplates() {
1185                 global $wgUser;
1186
1187                 $fname = 'EditPage::formatTemplates';
1188                 wfProfileIn( $fname );
1189
1190                 $sk =& $wgUser->getSkin();
1191
1192                 $outText = '';
1193                 $templates = $this->mArticle->getUsedTemplates();
1194                 if ( count( $templates ) > 0 ) {
1195                         # Do a batch existence check
1196                         $batch = new LinkBatch;
1197                         foreach( $templates as $title ) {
1198                                 $batch->addObj( $title );
1199                         }
1200                         $batch->execute();
1201
1202                         # Construct the HTML
1203                         $outText = '<br />'. wfMsgExt( 'templatesused', array( 'parseinline' ) ) . '<ul>';
1204                         foreach ( $templates as $titleObj ) {
1205                                 $outText .= '<li>' . $sk->makeLinkObj( $titleObj ) . '</li>';
1206                         }
1207                         $outText .= '</ul>';
1208                 }
1209                 wfProfileOut( $fname );
1210                 return $outText;
1211         }
1212
1213         /**
1214          * Live Preview lets us fetch rendered preview page content and
1215          * add it to the page without refreshing the whole page.
1216          * If not supported by the browser it will fall through to the normal form
1217          * submission method.
1218          *
1219          * This function outputs a script tag to support live preview, and
1220          * returns an onclick handler which should be added to the attributes
1221          * of the preview button
1222          */
1223         function doLivePreviewScript() {
1224                 global $wgStylePath, $wgJsMimeType, $wgOut, $wgTitle;
1225                 $wgOut->addHTML( '<script type="'.$wgJsMimeType.'" src="' .
1226                         htmlspecialchars( $wgStylePath . '/common/preview.js' ) .
1227                         '"></script>' . "\n" );
1228                 $liveAction = $wgTitle->getLocalUrl( 'action=submit&wpPreview=true&live=true' );
1229                 return "return !livePreview(" .
1230                         "getElementById('wikiPreview')," .
1231                         "editform.wpTextbox1.value," .
1232                         '"' . $liveAction . '"' . ")";
1233         }
1234
1235         function getLastDelete() {
1236                 $dbr =& wfGetDB( DB_SLAVE );
1237                 $fname = 'EditPage::getLastDelete';
1238                 $res = $dbr->select(
1239                         array( 'logging', 'user' ),
1240                         array( 'log_type',
1241                                'log_action',
1242                                'log_timestamp',
1243                                'log_user',
1244                                'log_namespace',
1245                                'log_title',
1246                                'log_comment',
1247                                'log_params',
1248                                'user_name', ),
1249                         array( 'log_namespace' => $this->mTitle->getNamespace(),
1250                                'log_title' => $this->mTitle->getDBkey(),
1251                                'log_type' => 'delete',
1252                                'log_action' => 'delete',
1253                                'user_id=log_user' ),
1254                         $fname,
1255                         array( 'LIMIT' => 1, 'ORDER BY' => 'log_timestamp DESC' ) );
1256
1257                 if($dbr->numRows($res) == 1) {
1258                         while ( $x = $dbr->fetchObject ( $res ) )
1259                                 $data = $x;
1260                         $dbr->freeResult ( $res ) ;
1261                 } else {
1262                         $data = null;
1263                 }
1264                 return $data;
1265         }
1266
1267         /**
1268          * @todo document
1269          */
1270         function getPreviewText() {
1271                 global $wgOut, $wgUser, $wgTitle, $wgParser;
1272
1273                 $fname = 'EditPage::getPreviewText';
1274                 wfProfileIn( $fname );
1275
1276                 if ( $this->mTriedSave && !$this->mTokenOk ) {
1277                         $msg = 'session_fail_preview';
1278                 } else {
1279                         $msg = 'previewnote';
1280                 }
1281                 $previewhead = '<h2>' . htmlspecialchars( wfMsg( 'preview' ) ) . "</h2>\n" .
1282                         "<div class='previewnote'>" . $wgOut->parse( wfMsg( $msg ) ) . "</div>\n";
1283                 if ( $this->isConflict ) {
1284                         $previewhead.='<h2>' . htmlspecialchars( wfMsg( 'previewconflict' ) ) . "</h2>\n";
1285                 }
1286
1287                 $parserOptions = ParserOptions::newFromUser( $wgUser );
1288                 $parserOptions->setEditSection( false );
1289
1290                 global $wgRawHtml;
1291                 if( $wgRawHtml && !$this->mTokenOk ) {
1292                         // Could be an offsite preview attempt. This is very unsafe if
1293                         // HTML is enabled, as it could be an attack.
1294                         return $wgOut->parse( "<div class='previewnote'>" .
1295                                 wfMsg( 'session_fail_preview_html' ) . "</div>" );
1296                 }
1297
1298                 # don't parse user css/js, show message about preview
1299                 # XXX: stupid php bug won't let us use $wgTitle->isCssJsSubpage() here
1300
1301                 if ( $this->isCssJsSubpage ) {
1302                         if(preg_match("/\\.css$/", $wgTitle->getText() ) ) {
1303                                 $previewtext = wfMsg('usercsspreview');
1304                         } else if(preg_match("/\\.js$/", $wgTitle->getText() ) ) {
1305                                 $previewtext = wfMsg('userjspreview');
1306                         }
1307                         $parserOptions->setTidy(true);
1308                         $parserOutput = $wgParser->parse( $previewtext , $wgTitle, $parserOptions );
1309                         $wgOut->addHTML( $parserOutput->mText );
1310                         wfProfileOut( $fname );
1311                         return $previewhead;
1312                 } else {
1313                         # if user want to see preview when he edit an article
1314                         if( $wgUser->getOption('previewonfirst') and ($this->textbox1 == '')) {
1315                                 $this->textbox1 = $this->mArticle->getContent();
1316                         }
1317
1318                         $toparse = $this->textbox1;
1319
1320                         # If we're adding a comment, we need to show the
1321                         # summary as the headline
1322                         if($this->section=="new" && $this->summary!="") {
1323                                 $toparse="== {$this->summary} ==\n\n".$toparse;
1324                         }
1325
1326                         if ( $this->mMetaData != "" ) $toparse .= "\n" . $this->mMetaData ;
1327                         $parserOptions->setTidy(true);
1328                         $parserOutput = $wgParser->parse( $this->mArticle->preSaveTransform( $toparse ) ."\n\n",
1329                                         $wgTitle, $parserOptions );
1330
1331                         $previewHTML = $parserOutput->getText();
1332                         $wgOut->addParserOutputNoText( $parserOutput );
1333
1334                         wfProfileOut( $fname );
1335                         return $previewhead . $previewHTML;
1336                 }
1337         }
1338
1339         /**
1340          * Call the stock "user is blocked" page
1341          */
1342         function blockedIPpage() {
1343                 global $wgOut;
1344                 $wgOut->blockedPage();
1345         }
1346
1347         /**
1348          * Produce the stock "please login to edit pages" page
1349          */
1350         function userNotLoggedInPage() {
1351                 global $wgUser, $wgOut;
1352                 $skin = $wgUser->getSkin();
1353
1354                 $loginTitle = Title::makeTitle( NS_SPECIAL, 'Userlogin' );
1355                 $loginLink = $skin->makeKnownLinkObj( $loginTitle, wfMsgHtml( 'loginreqlink' ), 'returnto=' . $this->mTitle->getPrefixedUrl() );
1356
1357                 $wgOut->setPageTitle( wfMsg( 'whitelistedittitle' ) );
1358                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1359                 $wgOut->setArticleRelated( false );
1360
1361                 $wgOut->addHtml( wfMsgWikiHtml( 'whitelistedittext', $loginLink ) );
1362                 $wgOut->returnToMain( false, $this->mTitle->getPrefixedUrl() );
1363         }
1364
1365         /**
1366          * Creates a basic error page which informs the user that
1367          * they have to validate their email address before being
1368          * allowed to edit.
1369          */
1370         function userNotConfirmedPage() {
1371                 global $wgOut;
1372
1373                 $wgOut->setPageTitle( wfMsg( 'confirmedittitle' ) );
1374                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1375                 $wgOut->setArticleRelated( false );
1376
1377                 $wgOut->addWikiText( wfMsg( 'confirmedittext' ) );
1378                 $wgOut->returnToMain( false );
1379         }
1380
1381         /**
1382          * Produce the stock "your edit contains spam" page
1383          *
1384          * @param $match Text which triggered one or more filters
1385          */
1386         function spamPage( $match = false ) {
1387                 global $wgOut;
1388
1389                 $wgOut->setPageTitle( wfMsg( 'spamprotectiontitle' ) );
1390                 $wgOut->setRobotPolicy( 'noindex,nofollow' );
1391                 $wgOut->setArticleRelated( false );
1392
1393                 $wgOut->addWikiText( wfMsg( 'spamprotectiontext' ) );
1394                 if ( $match )
1395                         $wgOut->addWikiText( wfMsg( 'spamprotectionmatch', "<nowiki>{$match}</nowiki>" ) );
1396
1397                 $wgOut->returnToMain( false );
1398         }
1399
1400         /**
1401          * @private
1402          * @todo document
1403          */
1404         function mergeChangesInto( &$editText ){
1405                 $fname = 'EditPage::mergeChangesInto';
1406                 wfProfileIn( $fname );
1407
1408                 $db =& wfGetDB( DB_MASTER );
1409
1410                 // This is the revision the editor started from
1411                 $baseRevision = Revision::loadFromTimestamp(
1412                         $db, $this->mArticle->mTitle, $this->edittime );
1413                 if( is_null( $baseRevision ) ) {
1414                         wfProfileOut( $fname );
1415                         return false;
1416                 }
1417                 $baseText = $baseRevision->getText();
1418
1419                 // The current state, we want to merge updates into it
1420                 $currentRevision =  Revision::loadFromTitle(
1421                         $db, $this->mArticle->mTitle );
1422                 if( is_null( $currentRevision ) ) {
1423                         wfProfileOut( $fname );
1424                         return false;
1425                 }
1426                 $currentText = $currentRevision->getText();
1427
1428                 if( wfMerge( $baseText, $editText, $currentText, $result ) ){
1429                         $editText = $result;
1430                         wfProfileOut( $fname );
1431                         return true;
1432                 } else {
1433                         wfProfileOut( $fname );
1434                         return false;
1435                 }
1436         }
1437
1438         /**
1439          * Check if the browser is on a blacklist of user-agents known to
1440          * mangle UTF-8 data on form submission. Returns true if Unicode
1441          * should make it through, false if it's known to be a problem.
1442          * @return bool
1443          * @private
1444          */
1445         function checkUnicodeCompliantBrowser() {
1446                 global $wgBrowserBlackList;
1447                 if( empty( $_SERVER["HTTP_USER_AGENT"] ) ) {
1448                         // No User-Agent header sent? Trust it by default...
1449                         return true;
1450                 }
1451                 $currentbrowser = $_SERVER["HTTP_USER_AGENT"];
1452                 foreach ( $wgBrowserBlackList as $browser ) {
1453                         if ( preg_match($browser, $currentbrowser) ) {
1454                                 return false;
1455                         }
1456                 }
1457                 return true;
1458         }
1459
1460         /**
1461          * Format an anchor fragment as it would appear for a given section name
1462          * @param string $text
1463          * @return string
1464          * @private
1465          */
1466         function sectionAnchor( $text ) {
1467                 $headline = Sanitizer::decodeCharReferences( $text );
1468                 # strip out HTML
1469                 $headline = preg_replace( '/<.*?' . '>/', '', $headline );
1470                 $headline = trim( $headline );
1471                 $sectionanchor = '#' . urlencode( str_replace( ' ', '_', $headline ) );
1472                 $replacearray = array(
1473                         '%3A' => ':',
1474                         '%' => '.'
1475                 );
1476                 return str_replace(
1477                         array_keys( $replacearray ),
1478                         array_values( $replacearray ),
1479                         $sectionanchor );
1480         }
1481
1482         /**
1483          * Shows a bulletin board style toolbar for common editing functions.
1484          * It can be disabled in the user preferences.
1485          * The necessary JavaScript code can be found in style/wikibits.js.
1486          */
1487         function getEditToolbar() {
1488                 global $wgStylePath, $wgContLang, $wgJsMimeType;
1489
1490                 /**
1491                  * toolarray an array of arrays which each include the filename of
1492                  * the button image (without path), the opening tag, the closing tag,
1493                  * and optionally a sample text that is inserted between the two when no
1494                  * selection is highlighted.
1495                  * The tip text is shown when the user moves the mouse over the button.
1496                  *
1497                  * Already here are accesskeys (key), which are not used yet until someone
1498                  * can figure out a way to make them work in IE. However, we should make
1499                  * sure these keys are not defined on the edit page.
1500                  */
1501                 $toolarray=array(
1502                         array(  'image'=>'button_bold.png',
1503                                         'open'  =>      "\'\'\'",
1504                                         'close' =>      "\'\'\'",
1505                                         'sample'=>      wfMsg('bold_sample'),
1506                                         'tip'   =>      wfMsg('bold_tip'),
1507                                         'key'   =>      'B'
1508                                 ),
1509                         array(  'image'=>'button_italic.png',
1510                                         'open'  =>      "\'\'",
1511                                         'close' =>      "\'\'",
1512                                         'sample'=>      wfMsg('italic_sample'),
1513                                         'tip'   =>      wfMsg('italic_tip'),
1514                                         'key'   =>      'I'
1515                                 ),
1516                         array(  'image'=>'button_link.png',
1517                                         'open'  =>      '[[',
1518                                         'close' =>      ']]',
1519                                         'sample'=>      wfMsg('link_sample'),
1520                                         'tip'   =>      wfMsg('link_tip'),
1521                                         'key'   =>      'L'
1522                                 ),
1523                         array(  'image'=>'button_extlink.png',
1524                                         'open'  =>      '[',
1525                                         'close' =>      ']',
1526                                         'sample'=>      wfMsg('extlink_sample'),
1527                                         'tip'   =>      wfMsg('extlink_tip'),
1528                                         'key'   =>      'X'
1529                                 ),
1530                         array(  'image'=>'button_headline.png',
1531                                         'open'  =>      "\\n== ",
1532                                         'close' =>      " ==\\n",
1533                                         'sample'=>      wfMsg('headline_sample'),
1534                                         'tip'   =>      wfMsg('headline_tip'),
1535                                         'key'   =>      'H'
1536                                 ),
1537                         array(  'image'=>'button_image.png',
1538                                         'open'  =>      '[['.$wgContLang->getNsText(NS_IMAGE).":",
1539                                         'close' =>      ']]',
1540                                         'sample'=>      wfMsg('image_sample'),
1541                                         'tip'   =>      wfMsg('image_tip'),
1542                                         'key'   =>      'D'
1543                                 ),
1544                         array(  'image' =>'button_media.png',
1545                                         'open'  =>      '[['.$wgContLang->getNsText(NS_MEDIA).':',
1546                                         'close' =>      ']]',
1547                                         'sample'=>      wfMsg('media_sample'),
1548                                         'tip'   =>      wfMsg('media_tip'),
1549                                         'key'   =>      'M'
1550                                 ),
1551                         array(  'image' =>'button_math.png',
1552                                         'open'  =>      "<math>",
1553                                         'close' =>      "<\\/math>",
1554                                         'sample'=>      wfMsg('math_sample'),
1555                                         'tip'   =>      wfMsg('math_tip'),
1556                                         'key'   =>      'C'
1557                                 ),
1558                         array(  'image' =>'button_nowiki.png',
1559                                         'open'  =>      "<nowiki>",
1560                                         'close' =>      "<\\/nowiki>",
1561                                         'sample'=>      wfMsg('nowiki_sample'),
1562                                         'tip'   =>      wfMsg('nowiki_tip'),
1563                                         'key'   =>      'N'
1564                                 ),
1565                         array(  'image' =>'button_sig.png',
1566                                         'open'  =>      '--~~~~',
1567                                         'close' =>      '',
1568                                         'sample'=>      '',
1569                                         'tip'   =>      wfMsg('sig_tip'),
1570                                         'key'   =>      'Y'
1571                                 ),
1572                         array(  'image' =>'button_hr.png',
1573                                         'open'  =>      "\\n----\\n",
1574                                         'close' =>      '',
1575                                         'sample'=>      '',
1576                                         'tip'   =>      wfMsg('hr_tip'),
1577                                         'key'   =>      'R'
1578                                 )
1579                 );
1580                 $toolbar = "<div id='toolbar'>\n";
1581                 $toolbar.="<script type='$wgJsMimeType'>\n/*<![CDATA[*/\n";
1582
1583                 foreach($toolarray as $tool) {
1584
1585                         $image=$wgStylePath.'/common/images/'.$tool['image'];
1586                         $open=$tool['open'];
1587                         $close=$tool['close'];
1588                         $sample = wfEscapeJsString( $tool['sample'] );
1589
1590                         // Note that we use the tip both for the ALT tag and the TITLE tag of the image.
1591                         // Older browsers show a "speedtip" type message only for ALT.
1592                         // Ideally these should be different, realistically they
1593                         // probably don't need to be.
1594                         $tip = wfEscapeJsString( $tool['tip'] );
1595
1596                         #$key = $tool["key"];
1597
1598                         $toolbar.="addButton('$image','$tip','$open','$close','$sample');\n";
1599                 }
1600
1601                 $toolbar.="/*]]>*/\n</script>";
1602                 $toolbar.="\n</div>";
1603                 return $toolbar;
1604         }
1605
1606         /**
1607          * Output preview text only. This can be sucked into the edit page
1608          * via JavaScript, and saves the server time rendering the skin as
1609          * well as theoretically being more robust on the client (doesn't
1610          * disturb the edit box's undo history, won't eat your text on
1611          * failure, etc).
1612          *
1613          * @todo This doesn't include category or interlanguage links.
1614          *       Would need to enhance it a bit, maybe wrap them in XML
1615          *       or something... that might also require more skin
1616          *       initialization, so check whether that's a problem.
1617          */
1618         function livePreview() {
1619                 global $wgOut;
1620                 $wgOut->disable();
1621                 header( 'Content-type: text/xml' );
1622                 header( 'Cache-control: no-cache' );
1623                 # FIXME
1624                 echo $this->getPreviewText( );
1625                 /* To not shake screen up and down between preview and live-preview */
1626                 echo "<br style=\"clear:both;\" />\n";
1627         }
1628
1629
1630         /**
1631          * Get a diff between the current contents of the edit box and the
1632          * version of the page we're editing from.
1633          *
1634          * If this is a section edit, we'll replace the section as for final
1635          * save and then make a comparison.
1636          *
1637          * @return string HTML
1638          */
1639         function getDiff() {
1640                 require_once( 'DifferenceEngine.php' );
1641                 $oldtext = $this->mArticle->fetchContent();
1642                 $newtext = $this->mArticle->replaceSection(
1643                         $this->section, $this->textbox1, $this->summary, $this->edittime );
1644                 $newtext = $this->mArticle->preSaveTransform( $newtext );
1645                 $oldtitle = wfMsgExt( 'currentrev', array('parseinline') );
1646                 $newtitle = wfMsgExt( 'yourtext', array('parseinline') );
1647                 if ( $oldtext !== false  || $newtext != '' ) {
1648                         $de = new DifferenceEngine( $this->mTitle );
1649                         $de->setText( $oldtext, $newtext );
1650                         $difftext = $de->getDiff( $oldtitle, $newtitle );
1651                 } else {
1652                         $difftext = '';
1653                 }
1654
1655                 return '<div id="wikiDiff">' . $difftext . '</div>';
1656         }
1657
1658         /**
1659          * Filter an input field through a Unicode de-armoring process if it
1660          * came from an old browser with known broken Unicode editing issues.
1661          *
1662          * @param WebRequest $request
1663          * @param string $field
1664          * @return string
1665          * @private
1666          */
1667         function safeUnicodeInput( $request, $field ) {
1668                 $text = rtrim( $request->getText( $field ) );
1669                 return $request->getBool( 'safemode' )
1670                         ? $this->unmakesafe( $text )
1671                         : $text;
1672         }
1673
1674         /**
1675          * Filter an output field through a Unicode armoring process if it is
1676          * going to an old browser with known broken Unicode editing issues.
1677          *
1678          * @param string $text
1679          * @return string
1680          * @private
1681          */
1682         function safeUnicodeOutput( $text ) {
1683                 global $wgContLang;
1684                 $codedText = $wgContLang->recodeForEdit( $text );
1685                 return $this->checkUnicodeCompliantBrowser()
1686                         ? $codedText
1687                         : $this->makesafe( $codedText );
1688         }
1689
1690         /**
1691          * A number of web browsers are known to corrupt non-ASCII characters
1692          * in a UTF-8 text editing environment. To protect against this,
1693          * detected browsers will be served an armored version of the text,
1694          * with non-ASCII chars converted to numeric HTML character references.
1695          *
1696          * Preexisting such character references will have a 0 added to them
1697          * to ensure that round-trips do not alter the original data.
1698          *
1699          * @param string $invalue
1700          * @return string
1701          * @private
1702          */
1703         function makesafe( $invalue ) {
1704                 // Armor existing references for reversability.
1705                 $invalue = strtr( $invalue, array( "&#x" => "&#x0" ) );
1706
1707                 $bytesleft = 0;
1708                 $result = "";
1709                 $working = 0;
1710                 for( $i = 0; $i < strlen( $invalue ); $i++ ) {
1711                         $bytevalue = ord( $invalue{$i} );
1712                         if( $bytevalue <= 0x7F ) { //0xxx xxxx
1713                                 $result .= chr( $bytevalue );
1714                                 $bytesleft = 0;
1715                         } elseif( $bytevalue <= 0xBF ) { //10xx xxxx
1716                                 $working = $working << 6;
1717                                 $working += ($bytevalue & 0x3F);
1718                                 $bytesleft--;
1719                                 if( $bytesleft <= 0 ) {
1720                                         $result .= "&#x" . strtoupper( dechex( $working ) ) . ";";
1721                                 }
1722                         } elseif( $bytevalue <= 0xDF ) { //110x xxxx
1723                                 $working = $bytevalue & 0x1F;
1724                                 $bytesleft = 1;
1725                         } elseif( $bytevalue <= 0xEF ) { //1110 xxxx
1726                                 $working = $bytevalue & 0x0F;
1727                                 $bytesleft = 2;
1728                         } else { //1111 0xxx
1729                                 $working = $bytevalue & 0x07;
1730                                 $bytesleft = 3;
1731                         }
1732                 }
1733                 return $result;
1734         }
1735
1736         /**
1737          * Reverse the previously applied transliteration of non-ASCII characters
1738          * back to UTF-8. Used to protect data from corruption by broken web browsers
1739          * as listed in $wgBrowserBlackList.
1740          *
1741          * @param string $invalue
1742          * @return string
1743          * @private
1744          */
1745         function unmakesafe( $invalue ) {
1746                 $result = "";
1747                 for( $i = 0; $i < strlen( $invalue ); $i++ ) {
1748                         if( ( substr( $invalue, $i, 3 ) == "&#x" ) && ( $invalue{$i+3} != '0' ) ) {
1749                                 $i += 3;
1750                                 $hexstring = "";
1751                                 do {
1752                                         $hexstring .= $invalue{$i};
1753                                         $i++;
1754                                 } while( ctype_xdigit( $invalue{$i} ) && ( $i < strlen( $invalue ) ) );
1755
1756                                 // Do some sanity checks. These aren't needed for reversability,
1757                                 // but should help keep the breakage down if the editor
1758                                 // breaks one of the entities whilst editing.
1759                                 if ((substr($invalue,$i,1)==";") and (strlen($hexstring) <= 6)) {
1760                                         $codepoint = hexdec($hexstring);
1761                                         $result .= codepointToUtf8( $codepoint );
1762                                 } else {
1763                                         $result .= "&#x" . $hexstring . substr( $invalue, $i, 1 );
1764                                 }
1765                         } else {
1766                                 $result .= substr( $invalue, $i, 1 );
1767                         }
1768                 }
1769                 // reverse the transform that we made for reversability reasons.
1770                 return strtr( $result, array( "&#x0" => "&#x" ) );
1771         }
1772
1773         function noCreatePermission() {
1774                 global $wgOut;
1775                 $wgOut->setPageTitle( wfMsg( 'nocreatetitle' ) );
1776                 $wgOut->addWikiText( wfMsg( 'nocreatetext' ) );
1777         }
1778
1779 }
1780
1781 ?>