includes/actions/pagers/HistoryPager.php

   1 <?php
   2 /**
   3  * Page history pager
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup Actions
  22  */
  23
  24 use MediaWiki\MediaWikiServices;
  25 use MediaWiki\Revision\RevisionRecord;
  26
  27 /**
  28  * @ingroup Pager
  29  * @ingroup Actions
  30  */
  31 class HistoryPager extends ReverseChronologicalPager {
  32         /**
  33          * @var bool|stdClass
  34          */
  35         public $lastRow = false;
  36
  37         public $counter, $historyPage, $buttons, $conds;
  38
  39         protected $oldIdChecked;
  40
  41         protected $preventClickjacking = false;
  42         /**
  43          * @var array
  44          */
  45         protected $parentLens;
  46
  47         /** @var bool Whether to show the tag editing UI */
  48         protected $showTagEditUI;
  49
  50         /** @var string */
  51         private $tagFilter;
  52
  53         /**
  54          * @param HistoryAction $historyPage
  55          * @param string $year
  56          * @param string $month
  57          * @param string $tagFilter
  58          * @param array $conds
  59          * @param string $day
  60          */
  61         public function __construct(
  62                 HistoryAction $historyPage,
  63                 $year = '',
  64                 $month = '',
  65                 $tagFilter = '',
  66                 array $conds = [],
  67                 $day = ''
  68         ) {
  69                 parent::__construct( $historyPage->getContext() );
  70                 $this->historyPage = $historyPage;
  71                 $this->tagFilter = $tagFilter;
  72                 $this->getDateCond( $year, $month, $day );
  73                 $this->conds = $conds;
  74                 $this->showTagEditUI = ChangeTags::showTagEditingUI( $this->getUser() );
  75         }
  76
  77         // For hook compatibility...
  78         function getArticle() {
  79                 return $this->historyPage->getArticle();
  80         }
  81
  82         function getSqlComment() {
  83                 if ( $this->conds ) {
  84                         return 'history page filtered'; // potentially slow, see CR r58153
  85                 } else {
  86                         return 'history page unfiltered';
  87                 }
  88         }
  89
  90         function getQueryInfo() {
  91                 $revQuery = Revision::getQueryInfo( [ 'user' ] );
  92                 $queryInfo = [
  93                         'tables' => $revQuery['tables'],
  94                         'fields' => $revQuery['fields'],
  95                         'conds' => array_merge(
  96                                 [ 'rev_page' => $this->getWikiPage()->getId() ],
  97                                 $this->conds ),
  98                         'options' => [ 'USE INDEX' => [ 'revision' => 'page_timestamp' ] ],
  99                         'join_conds' => $revQuery['joins'],
 100                 ];
 101                 ChangeTags::modifyDisplayQuery(
 102                         $queryInfo['tables'],
 103                         $queryInfo['fields'],
 104                         $queryInfo['conds'],
 105                         $queryInfo['join_conds'],
 106                         $queryInfo['options'],
 107                         $this->tagFilter
 108                 );
 109
 110                 // Avoid PHP 7.1 warning of passing $this by reference
 111                 $historyPager = $this;
 112                 Hooks::run( 'PageHistoryPager::getQueryInfo', [ &$historyPager, &$queryInfo ] );
 113
 114                 return $queryInfo;
 115         }
 116
 117         function getIndexField() {
 118                 return 'rev_timestamp';
 119         }
 120
 121         /**
 122          * @param stdClass $row
 123          * @return string
 124          */
 125         function formatRow( $row ) {
 126                 if ( $this->lastRow ) {
 127                         $firstInList = $this->counter == 1;
 128                         $this->counter++;
 129
 130                         $notifTimestamp = $this->getConfig()->get( 'ShowUpdatedMarker' )
 131                                 ? $this->getTitle()->getNotificationTimestamp( $this->getUser() )
 132                                 : false;
 133
 134                         $s = $this->historyLine( $this->lastRow, $row, $notifTimestamp, false, $firstInList );
 135                 } else {
 136                         $s = '';
 137                 }
 138                 $this->lastRow = $row;
 139
 140                 return $s;
 141         }
 142
 143         protected function doBatchLookups() {
 144                 if ( !Hooks::run( 'PageHistoryPager::doBatchLookups', [ $this, $this->mResult ] ) ) {
 145                         return;
 146                 }
 147
 148                 # Do a link batch query
 149                 $this->mResult->seek( 0 );
 150                 $batch = new LinkBatch();
 151                 $revIds = [];
 152                 foreach ( $this->mResult as $row ) {
 153                         if ( $row->rev_parent_id ) {
 154                                 $revIds[] = $row->rev_parent_id;
 155                         }
 156                         if ( $row->user_name !== null ) {
 157                                 $batch->add( NS_USER, $row->user_name );
 158                                 $batch->add( NS_USER_TALK, $row->user_name );
 159                         } else { # for anons or usernames of imported revisions
 160                                 $batch->add( NS_USER, $row->rev_user_text );
 161                                 $batch->add( NS_USER_TALK, $row->rev_user_text );
 162                         }
 163                 }
 164                 $this->parentLens = Revision::getParentLengths( $this->mDb, $revIds );
 165                 $batch->execute();
 166                 $this->mResult->seek( 0 );
 167         }
 168
 169         /**
 170          * Creates begin of history list with a submit button
 171          *
 172          * @return string HTML output
 173          */
 174         protected function getStartBody() {
 175                 $permissionManager = MediaWikiServices::getInstance()->getPermissionManager();
 176                 $this->lastRow = false;
 177                 $this->counter = 1;
 178                 $this->oldIdChecked = 0;
 179
 180                 $this->getOutput()->wrapWikiMsg( "<div class='mw-history-legend'>\n$1\n</div>", 'histlegend' );
 181                 $s = Html::openElement( 'form', [ 'action' => wfScript(),
 182                         'id' => 'mw-history-compare' ] ) . "\n";
 183                 $s .= Html::hidden( 'title', $this->getTitle()->getPrefixedDBkey() ) . "\n";
 184                 $s .= Html::hidden( 'action', 'historysubmit' ) . "\n";
 185                 $s .= Html::hidden( 'type', 'revision' ) . "\n";
 186
 187                 // Button container stored in $this->buttons for re-use in getEndBody()
 188                 $this->buttons = '';
 189                 if ( $this->getNumRows() > 0 ) {
 190                         $this->buttons .= Html::openElement(
 191                                 'div', [ 'class' => 'mw-history-compareselectedversions' ] );
 192                         $className = 'historysubmit mw-history-compareselectedversions-button';
 193                         $attrs = [ 'class' => $className ]
 194                                 + Linker::tooltipAndAccesskeyAttribs( 'compareselectedversions' );
 195                         $this->buttons .= $this->submitButton( $this->msg( 'compareselectedversions' )->text(),
 196                                 $attrs
 197                         ) . "\n";
 198
 199                         $user = $this->getUser();
 200                         $actionButtons = '';
 201                         if ( $permissionManager->userHasRight( $user, 'deleterevision' ) ) {
 202                                 $actionButtons .= $this->getRevisionButton(
 203                                         'revisiondelete', 'showhideselectedversions' );
 204                         }
 205                         if ( $this->showTagEditUI ) {
 206                                 $actionButtons .= $this->getRevisionButton(
 207                                         'editchangetags', 'history-edit-tags' );
 208                         }
 209                         if ( $actionButtons ) {
 210                                 $this->buttons .= Xml::tags( 'div', [ 'class' =>
 211                                         'mw-history-revisionactions' ], $actionButtons );
 212                         }
 213
 214                         if ( $permissionManager->userHasRight( $user, 'deleterevision' ) || $this->showTagEditUI ) {
 215                                 $this->buttons .= ( new ListToggle( $this->getOutput() ) )->getHTML();
 216                         }
 217
 218                         $this->buttons .= '</div>';
 219
 220                         $s .= $this->buttons;
 221                 }
 222                 $s .= '<ul id="pagehistory">' . "\n";
 223
 224                 return $s;
 225         }
 226
 227         private function getRevisionButton( $name, $msg ) {
 228                 $this->preventClickjacking();
 229                 # Note T22966, <button> is non-standard in IE<8
 230                 $element = Html::element(
 231                         'button',
 232                         [
 233                                 'type' => 'submit',
 234                                 'name' => $name,
 235                                 'value' => '1',
 236                                 'class' => "historysubmit mw-history-$name-button",
 237                         ],
 238                         $this->msg( $msg )->text()
 239                 ) . "\n";
 240                 return $element;
 241         }
 242
 243         protected function getEndBody() {
 244                 if ( $this->lastRow ) {
 245                         $firstInList = $this->counter == 1;
 246                         if ( $this->mIsBackwards ) {
 247                                 # Next row is unknown, but for UI reasons, probably exists if an offset has been specified
 248                                 if ( $this->mOffset == '' ) {
 249                                         $next = null;
 250                                 } else {
 251                                         $next = 'unknown';
 252                                 }
 253                         } else {
 254                                 # The next row is the past-the-end row
 255                                 $next = $this->mPastTheEndRow;
 256                         }
 257                         $this->counter++;
 258
 259                         $notifTimestamp = $this->getConfig()->get( 'ShowUpdatedMarker' )
 260                                 ? $this->getTitle()->getNotificationTimestamp( $this->getUser() )
 261                                 : false;
 262
 263                         $s = $this->historyLine( $this->lastRow, $next, $notifTimestamp, false, $firstInList );
 264                 } else {
 265                         $s = '';
 266                 }
 267                 $s .= "</ul>\n";
 268                 # Add second buttons only if there is more than one rev
 269                 if ( $this->getNumRows() > 2 ) {
 270                         $s .= $this->buttons;
 271                 }
 272                 $s .= '</form>';
 273
 274                 return $s;
 275         }
 276
 277         /**
 278          * Creates a submit button
 279          *
 280          * @param string $message Text of the submit button, will be escaped
 281          * @param array $attributes
 282          * @return string HTML output for the submit button
 283          */
 284         function submitButton( $message, $attributes = [] ) {
 285                 # Disable submit button if history has 1 revision only
 286                 if ( $this->getNumRows() > 1 ) {
 287                         return Html::submitButton( $message, $attributes );
 288                 } else {
 289                         return '';
 290                 }
 291         }
 292
 293         /**
 294          * Returns a row from the history printout.
 295          *
 296          * @todo document some more, and maybe clean up the code (some params redundant?)
 297          *
 298          * @param stdClass $row The database row corresponding to the previous line.
 299          * @param mixed $next The database row corresponding to the next line
 300          *   (chronologically previous)
 301          * @param bool|string $notificationtimestamp
 302          * @param bool $dummy Unused.
 303          * @param bool $firstInList Whether this row corresponds to the first
 304          *   displayed on this history page.
 305          * @return string HTML output for the row
 306          */
 307         function historyLine( $row, $next, $notificationtimestamp = false,
 308                 $dummy = false, $firstInList = false ) {
 309                 $permissionManager = MediaWikiServices::getInstance()->getPermissionManager();
 310                 $rev = new Revision( $row, 0, $this->getTitle() );
 311
 312                 if ( is_object( $next ) ) {
 313                         $prevRev = new Revision( $next, 0, $this->getTitle() );
 314                 } else {
 315                         $prevRev = null;
 316                 }
 317
 318                 $latest = $rev->getId() === $this->getWikiPage()->getLatest();
 319                 $curlink = $this->curLink( $rev );
 320                 $lastlink = $this->lastLink( $rev, $next );
 321                 $curLastlinks = Html::rawElement( 'span', [], $curlink ) .
 322                         Html::rawElement( 'span', [], $lastlink );
 323                 $histLinks = Html::rawElement(
 324                         'span',
 325                         [ 'class' => 'mw-history-histlinks mw-changeslist-links' ],
 326                         $curLastlinks
 327                 );
 328
 329                 $diffButtons = $this->diffButtons( $rev, $firstInList );
 330                 $s = $histLinks . $diffButtons;
 331
 332                 $link = $this->revLink( $rev );
 333                 $classes = [];
 334
 335                 $del = '';
 336                 $user = $this->getUser();
 337                 $canRevDelete = $permissionManager->userHasRight( $user, 'deleterevision' );
 338                 // Show checkboxes for each revision, to allow for revision deletion and
 339                 // change tags
 340                 if ( $canRevDelete || $this->showTagEditUI ) {
 341                         $this->preventClickjacking();
 342                         // If revision was hidden from sysops and we don't need the checkbox
 343                         // for anything else, disable it
 344                         if ( !$this->showTagEditUI
 345                                 && !$rev->userCan( RevisionRecord::DELETED_RESTRICTED, $user )
 346                         ) {
 347                                 $del = Xml::check( 'deleterevisions', false, [ 'disabled' => 'disabled' ] );
 348                         // Otherwise, enable the checkbox...
 349                         } else {
 350                                 $del = Xml::check( 'showhiderevisions', false,
 351                                         [ 'name' => 'ids[' . $rev->getId() . ']' ] );
 352                         }
 353                 // User can only view deleted revisions...
 354                 } elseif ( $rev->getVisibility() &&
 355                                    $permissionManager->userHasRight( $user, 'deletedhistory' ) ) {
 356                         // If revision was hidden from sysops, disable the link
 357                         if ( !$rev->userCan( RevisionRecord::DELETED_RESTRICTED, $user ) ) {
 358                                 $del = Linker::revDeleteLinkDisabled( false );
 359                         // Otherwise, show the link...
 360                         } else {
 361                                 $query = [ 'type' => 'revision',
 362                                         'target' => $this->getTitle()->getPrefixedDBkey(), 'ids' => $rev->getId() ];
 363                                 $del .= Linker::revDeleteLink( $query,
 364                                         $rev->isDeleted( RevisionRecord::DELETED_RESTRICTED ), false );
 365                         }
 366                 }
 367                 if ( $del ) {
 368                         $s .= " $del ";
 369                 }
 370
 371                 $lang = $this->getLanguage();
 372                 $dirmark = $lang->getDirMark();
 373
 374                 $s .= " $link";
 375                 $s .= $dirmark;
 376                 $s .= " <span class='history-user'>" .
 377                         Linker::revUserTools( $rev, true, false ) . "</span>";
 378                 $s .= $dirmark;
 379
 380                 if ( $rev->isMinor() ) {
 381                         $s .= ' ' . ChangesList::flag( 'minor', $this->getContext() );
 382                 }
 383
 384                 # Sometimes rev_len isn't populated
 385                 if ( $rev->getSize() !== null ) {
 386                         # Size is always public data
 387                         $prevSize = $this->parentLens[$row->rev_parent_id] ?? 0;
 388                         $sDiff = ChangesList::showCharacterDifference( $prevSize, $rev->getSize() );
 389                         $fSize = Linker::formatRevisionSize( $rev->getSize(), false );
 390                         $s .= ' <span class="mw-changeslist-separator"></span> ' . "$fSize $sDiff";
 391                 }
 392
 393                 # Text following the character difference is added just before running hooks
 394                 $s2 = Linker::revComment( $rev, false, true, false );
 395
 396                 if ( $notificationtimestamp && ( $row->rev_timestamp >= $notificationtimestamp ) ) {
 397                         $s2 .= ' <span class="updatedmarker">' . $this->msg( 'updatedmarker' )->escaped() . '</span>';
 398                         $classes[] = 'mw-history-line-updated';
 399                 }
 400
 401                 $tools = [];
 402
 403                 # Rollback and undo links
 404
 405                 if ( $prevRev && $permissionManager->quickUserCan( 'edit', $user, $this->getTitle() ) ) {
 406                         if ( $latest && $permissionManager->quickUserCan( 'rollback',
 407                                         $user, $this->getTitle() )
 408                         ) {
 409                                 // Get a rollback link without the brackets
 410                                 $rollbackLink = Linker::generateRollback(
 411                                         $rev,
 412                                         $this->getContext(),
 413                                         [ 'verify', 'noBrackets' ]
 414                                 );
 415                                 if ( $rollbackLink ) {
 416                                         $this->preventClickjacking();
 417                                         $tools[] = $rollbackLink;
 418                                 }
 419                         }
 420
 421                         if ( !$rev->isDeleted( RevisionRecord::DELETED_TEXT )
 422                                 && !$prevRev->isDeleted( RevisionRecord::DELETED_TEXT )
 423                         ) {
 424                                 # Create undo tooltip for the first (=latest) line only
 425                                 $undoTooltip = $latest
 426                                         ? [ 'title' => $this->msg( 'tooltip-undo' )->text() ]
 427                                         : [];
 428                                 $undolink = $this->getLinkRenderer()->makeKnownLink(
 429                                         $this->getTitle(),
 430                                         $this->msg( 'editundo' )->text(),
 431                                         $undoTooltip,
 432                                         [
 433                                                 'action' => 'edit',
 434                                                 'undoafter' => $prevRev->getId(),
 435                                                 'undo' => $rev->getId()
 436                                         ]
 437                                 );
 438                                 $tools[] = "<span class=\"mw-history-undo\">{$undolink}</span>";
 439                         }
 440                 }
 441                 // Allow extension to add their own links here
 442                 Hooks::run( 'HistoryRevisionTools', [ $rev, &$tools, $prevRev, $user ] );
 443
 444                 if ( $tools ) {
 445                         $s2 .= ' ' . Html::openElement( 'span', [ 'class' => 'mw-changeslist-links' ] );
 446                         foreach ( $tools as $tool ) {
 447                                 $s2 .= Html::rawElement( 'span', [], $tool );
 448                         }
 449                         $s2 .= Html::closeElement( 'span' );
 450                 }
 451
 452                 # Tags
 453                 list( $tagSummary, $newClasses ) = ChangeTags::formatSummaryRow(
 454                         $row->ts_tags,
 455                         'history',
 456                         $this->getContext()
 457                 );
 458                 $classes = array_merge( $classes, $newClasses );
 459                 if ( $tagSummary !== '' ) {
 460                         $s2 .= " $tagSummary";
 461                 }
 462
 463                 # Include separator between character difference and following text
 464                 if ( $s2 !== '' ) {
 465                         $s .= ' <span class="mw-changeslist-separator"></span> ' . $s2;
 466                 }
 467
 468                 $attribs = [ 'data-mw-revid' => $rev->getId() ];
 469
 470                 Hooks::run( 'PageHistoryLineEnding', [ $this, &$row, &$s, &$classes, &$attribs ] );
 471                 $attribs = array_filter( $attribs,
 472                         [ Sanitizer::class, 'isReservedDataAttribute' ],
 473                         ARRAY_FILTER_USE_KEY
 474                 );
 475
 476                 if ( $classes ) {
 477                         $attribs['class'] = implode( ' ', $classes );
 478                 }
 479
 480                 return Xml::tags( 'li', $attribs, $s ) . "\n";
 481         }
 482
 483         /**
 484          * Create a link to view this revision of the page
 485          *
 486          * @param Revision $rev
 487          * @return string
 488          */
 489         function revLink( $rev ) {
 490                 return ChangesList::revDateLink( $rev, $this->getUser(), $this->getLanguage(),
 491                         $this->getTitle() );
 492         }
 493
 494         /**
 495          * Create a diff-to-current link for this revision for this page
 496          *
 497          * @param Revision $rev
 498          * @return string
 499          */
 500         function curLink( $rev ) {
 501                 $cur = $this->historyPage->message['cur'];
 502                 $latest = $this->getWikiPage()->getLatest();
 503                 if ( $latest === $rev->getId()
 504                         || !$rev->userCan( RevisionRecord::DELETED_TEXT, $this->getUser() )
 505                 ) {
 506                         return $cur;
 507                 } else {
 508                         return $this->getLinkRenderer()->makeKnownLink(
 509                                 $this->getTitle(),
 510                                 new HtmlArmor( $cur ),
 511                                 [],
 512                                 [
 513                                         'diff' => $latest,
 514                                         'oldid' => $rev->getId()
 515                                 ]
 516                         );
 517                 }
 518         }
 519
 520         /**
 521          * Create a diff-to-previous link for this revision for this page.
 522          *
 523          * @param Revision $prevRev The revision being displayed
 524          * @param stdClass|string|null $next The next revision in list (that is
 525          *        the previous one in chronological order).
 526          *        May either be a row, "unknown" or null.
 527          * @return string
 528          */
 529         function lastLink( $prevRev, $next ) {
 530                 $last = $this->historyPage->message['last'];
 531
 532                 if ( $next === null ) {
 533                         # Probably no next row
 534                         return $last;
 535                 }
 536
 537                 $linkRenderer = $this->getLinkRenderer();
 538                 if ( $next === 'unknown' ) {
 539                         # Next row probably exists but is unknown, use an oldid=prev link
 540                         return $linkRenderer->makeKnownLink(
 541                                 $this->getTitle(),
 542                                 new HtmlArmor( $last ),
 543                                 [],
 544                                 [
 545                                         'diff' => $prevRev->getId(),
 546                                         'oldid' => 'prev'
 547                                 ]
 548                         );
 549                 }
 550
 551                 $nextRev = new Revision( $next, 0, $this->getTitle() );
 552
 553                 if ( !$prevRev->userCan( RevisionRecord::DELETED_TEXT, $this->getUser() )
 554                         || !$nextRev->userCan( RevisionRecord::DELETED_TEXT, $this->getUser() )
 555                 ) {
 556                         return $last;
 557                 }
 558
 559                 return $linkRenderer->makeKnownLink(
 560                         $this->getTitle(),
 561                         new HtmlArmor( $last ),
 562                         [],
 563                         [
 564                                 'diff' => $prevRev->getId(),
 565                                 'oldid' => $next->rev_id
 566                         ]
 567                 );
 568         }
 569
 570         /**
 571          * Create radio buttons for page history
 572          *
 573          * @param Revision $rev
 574          * @param bool $firstInList Is this version the first one?
 575          *
 576          * @return string HTML output for the radio buttons
 577          */
 578         function diffButtons( $rev, $firstInList ) {
 579                 if ( $this->getNumRows() > 1 ) {
 580                         $id = $rev->getId();
 581                         $radio = [ 'type' => 'radio', 'value' => $id ];
 582                         /** @todo Move title texts to javascript */
 583                         if ( $firstInList ) {
 584                                 $first = Xml::element( 'input',
 585                                         array_merge( $radio, [
 586                                                 'style' => 'visibility:hidden',
 587                                                 'name' => 'oldid',
 588                                                 'id' => 'mw-oldid-null' ] )
 589                                 );
 590                                 $checkmark = [ 'checked' => 'checked' ];
 591                         } else {
 592                                 # Check visibility of old revisions
 593                                 if ( !$rev->userCan( RevisionRecord::DELETED_TEXT, $this->getUser() ) ) {
 594                                         $radio['disabled'] = 'disabled';
 595                                         $checkmark = []; // We will check the next possible one
 596                                 } elseif ( !$this->oldIdChecked ) {
 597                                         $checkmark = [ 'checked' => 'checked' ];
 598                                         $this->oldIdChecked = $id;
 599                                 } else {
 600                                         $checkmark = [];
 601                                 }
 602                                 $first = Xml::element( 'input',
 603                                         array_merge( $radio, $checkmark, [
 604                                                 'name' => 'oldid',
 605                                                 'id' => "mw-oldid-$id" ] ) );
 606                                 $checkmark = [];
 607                         }
 608                         $second = Xml::element( 'input',
 609                                 array_merge( $radio, $checkmark, [
 610                                         'name' => 'diff',
 611                                         'id' => "mw-diff-$id" ] ) );
 612
 613                         return $first . $second;
 614                 } else {
 615                         return '';
 616                 }
 617         }
 618
 619         /**
 620          * @inheritDoc
 621          */
 622         function getDefaultQuery() {
 623                 parent::getDefaultQuery();
 624                 unset( $this->mDefaultQuery['date-range-to'] );
 625                 return $this->mDefaultQuery;
 626         }
 627
 628         /**
 629          * This is called if a write operation is possible from the generated HTML
 630          * @param bool $enable
 631          */
 632         function preventClickjacking( $enable = true ) {
 633                 $this->preventClickjacking = $enable;
 634         }
 635
 636         /**
 637          * Get the "prevent clickjacking" flag
 638          * @return bool
 639          */
 640         function getPreventClickjacking() {
 641                 return $this->preventClickjacking;
 642         }
 643
 644 }