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