includes/actions/ViewAction.php

   1 <?php
   2 /**
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation; either version 2 of the License, or
   6  * (at your option) any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program; if not, write to the Free Software
  15  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
  16  *
  17  * @file
  18  * @ingroup Actions
  19  */
  20
  21 use MediaWiki\MainConfigNames;
  22 use MediaWiki\MediaWikiServices;
  23
  24 /**
  25  * An action that views article content
  26  *
  27  * This is a wrapper that will call Article::view().
  28  *
  29  * @ingroup Actions
  30  */
  31 class ViewAction extends FormlessAction {
  32
  33         public function getName() {
  34                 return 'view';
  35         }
  36
  37         public function onView() {
  38                 return null;
  39         }
  40
  41         public function needsReadRights() {
  42                 // Pages in $wgWhitelistRead can be viewed without having the 'read'
  43                 // right. We rely on Article::view() to properly check read access.
  44                 return false;
  45         }
  46
  47         public function show() {
  48                 $config = $this->context->getConfig();
  49
  50                 // Emit deprecated hook warnings.
  51                 // We do this only in the view action so that it reliably shows up in
  52                 // the debug toolbar without unduly impacting the performance of API and
  53                 // ResourceLoader requests.
  54                 MediaWikiServices::getInstance()->getHookContainer()->emitDeprecationWarnings();
  55
  56                 if (
  57                         !$config->get( MainConfigNames::DebugToolbar ) && // don't let this get stuck on pages
  58                         $this->getWikiPage()->checkTouched() // page exists and is not a redirect
  59                 ) {
  60                         // Include any redirect in the last-modified calculation
  61                         $redirFromTitle = $this->getArticle()->getRedirectedFrom();
  62                         if ( !$redirFromTitle ) {
  63                                 $touched = $this->getWikiPage()->getTouched();
  64                         } else {
  65                                 $touched = max(
  66                                         $this->getWikiPage()->getTouched(),
  67                                         $redirFromTitle->getTouched()
  68                                 );
  69                         }
  70
  71                         // Send HTTP 304 if the IMS matches or otherwise set expiry/last-modified headers
  72                         if ( $touched && $this->getOutput()->checkLastModified( $touched ) ) {
  73                                 wfDebug( __METHOD__ . ": done 304" );
  74                                 return;
  75                         }
  76                 }
  77
  78                 $this->getArticle()->view();
  79         }
  80 }