includes/actions/RawAction.php

   1 <?php
   2 /**
   3  * Raw page text accessor
   4  *
   5  * Copyright © 2004 Gabriel Wicke <wicke@wikidev.net>
   6  * http://wikidev.net/
   7  *
   8  * Based on HistoryAction and SpecialExport
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License along
  21  * with this program; if not, write to the Free Software Foundation, Inc.,
  22  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  23  * http://www.gnu.org/copyleft/gpl.html
  24  *
  25  * @author Gabriel Wicke <wicke@wikidev.net>
  26  * @file
  27  */
  28
  29 /**
  30  * A simple method to retrieve the plain source of an article,
  31  * using "action=raw" in the GET request string.
  32  *
  33  * @ingroup Actions
  34  */
  35 class RawAction extends FormlessAction {
  36         public function getName() {
  37                 return 'raw';
  38         }
  39
  40         public function requiresWrite() {
  41                 return false;
  42         }
  43
  44         public function requiresUnblock() {
  45                 return false;
  46         }
  47
  48         function onView() {
  49                 $this->getOutput()->disable();
  50                 $request = $this->getRequest();
  51                 $response = $request->response();
  52                 $config = $this->context->getConfig();
  53
  54                 if ( !$request->checkUrlExtension() ) {
  55                         return;
  56                 }
  57
  58                 if ( $this->getOutput()->checkLastModified( $this->page->getTouched() ) ) {
  59                         return; // Client cache fresh and headers sent, nothing more to do.
  60                 }
  61
  62                 $gen = $request->getVal( 'gen' );
  63                 if ( $gen == 'css' || $gen == 'js' ) {
  64                         $this->gen = true;
  65                 }
  66
  67                 $contentType = $this->getContentType();
  68
  69                 $maxage = $request->getInt( 'maxage', $config->get( 'SquidMaxage' ) );
  70                 $smaxage = $request->getIntOrNull( 'smaxage' );
  71                 if ( $smaxage === null ) {
  72                         if ( $contentType == 'text/css' || $contentType == 'text/javascript' ) {
  73                                 // CSS/JS raw content has its own CDN max age configuration.
  74                                 // Note: Title::getCdnUrls() includes action=raw for css/js pages,
  75                                 // so if using the canonical url, this will get HTCP purges.
  76                                 $smaxage = intval( $config->get( 'ForcedRawSMaxage' ) );
  77                         } else {
  78                                 // No CDN cache for anything else
  79                                 $smaxage = 0;
  80                         }
  81                 }
  82
  83                 // Set standard Vary headers so cache varies on cookies and such (T125283)
  84                 $response->header( $this->getOutput()->getVaryHeader() );
  85                 if ( $config->get( 'UseKeyHeader' ) ) {
  86                         $response->header( $this->getOutput()->getKeyHeader() );
  87                 }
  88
  89                 $response->header( 'Content-type: ' . $contentType . '; charset=UTF-8' );
  90                 // Output may contain user-specific data;
  91                 // vary generated content for open sessions on private wikis
  92                 $privateCache = !User::isEveryoneAllowed( 'read' ) &&
  93                         ( $smaxage == 0 || MediaWiki\Session\SessionManager::getGlobalSession()->isPersistent() );
  94                 // Don't accidentally cache cookies if user is logged in (T55032)
  95                 $privateCache = $privateCache || $this->getUser()->isLoggedIn();
  96                 $mode = $privateCache ? 'private' : 'public';
  97                 $response->header(
  98                         'Cache-Control: ' . $mode . ', s-maxage=' . $smaxage . ', max-age=' . $maxage
  99                 );
 100
 101                 $text = $this->getRawText();
 102
 103                 // Don't return a 404 response for CSS or JavaScript;
 104                 // 404s aren't generally cached and it would create
 105                 // extra hits when user CSS/JS are on and the user doesn't
 106                 // have the pages.
 107                 if ( $text === false && $contentType == 'text/x-wiki' ) {
 108                         $response->statusHeader( 404 );
 109                 }
 110
 111                 // Avoid PHP 7.1 warning of passing $this by reference
 112                 $rawAction = $this;
 113                 if ( !Hooks::run( 'RawPageViewBeforeOutput', [ &$rawAction, &$text ] ) ) {
 114                         wfDebug( __METHOD__ . ": RawPageViewBeforeOutput hook broke raw page output.\n" );
 115                 }
 116
 117                 echo $text;
 118         }
 119
 120         /**
 121          * Get the text that should be returned, or false if the page or revision
 122          * was not found.
 123          *
 124          * @return string|bool
 125          */
 126         public function getRawText() {
 127                 global $wgParser;
 128
 129                 $text = false;
 130                 $title = $this->getTitle();
 131                 $request = $this->getRequest();
 132
 133                 // If it's a MediaWiki message we can just hit the message cache
 134                 if ( $request->getBool( 'usemsgcache' ) && $title->getNamespace() == NS_MEDIAWIKI ) {
 135                         // The first "true" is to use the database, the second is to use
 136                         // the content langue and the last one is to specify the message
 137                         // key already contains the language in it ("/de", etc.).
 138                         $text = MessageCache::singleton()->get( $title->getDBkey(), true, true, true );
 139                         // If the message doesn't exist, return a blank
 140                         if ( $text === false ) {
 141                                 $text = '';
 142                         }
 143                 } else {
 144                         // Get it from the DB
 145                         $rev = Revision::newFromTitle( $title, $this->getOldId() );
 146                         if ( $rev ) {
 147                                 $lastmod = wfTimestamp( TS_RFC2822, $rev->getTimestamp() );
 148                                 $request->response()->header( "Last-modified: $lastmod" );
 149
 150                                 // Public-only due to cache headers
 151                                 $content = $rev->getContent();
 152
 153                                 if ( $content === null ) {
 154                                         // revision not found (or suppressed)
 155                                         $text = false;
 156                                 } elseif ( !$content instanceof TextContent ) {
 157                                         // non-text content
 158                                         wfHttpError( 415, "Unsupported Media Type", "The requested page uses the content model `"
 159                                                 . $content->getModel() . "` which is not supported via this interface." );
 160                                         die();
 161                                 } else {
 162                                         // want a section?
 163                                         $section = $request->getIntOrNull( 'section' );
 164                                         if ( $section !== null ) {
 165                                                 $content = $content->getSection( $section );
 166                                         }
 167
 168                                         if ( $content === null || $content === false ) {
 169                                                 // section not found (or section not supported, e.g. for JS and CSS)
 170                                                 $text = false;
 171                                         } else {
 172                                                 $text = $content->getNativeData();
 173                                         }
 174                                 }
 175                         }
 176                 }
 177
 178                 if ( $text !== false && $text !== '' && $request->getVal( 'templates' ) === 'expand' ) {
 179                         $text = $wgParser->preprocess(
 180                                 $text,
 181                                 $title,
 182                                 ParserOptions::newFromContext( $this->getContext() )
 183                         );
 184                 }
 185
 186                 return $text;
 187         }
 188
 189         /**
 190          * Get the ID of the revision that should used to get the text.
 191          *
 192          * @return int
 193          */
 194         public function getOldId() {
 195                 $oldid = $this->getRequest()->getInt( 'oldid' );
 196                 switch ( $this->getRequest()->getText( 'direction' ) ) {
 197                         case 'next':
 198                                 # output next revision, or nothing if there isn't one
 199                                 $nextid = 0;
 200                                 if ( $oldid ) {
 201                                         $nextid = $this->getTitle()->getNextRevisionID( $oldid );
 202                                 }
 203                                 $oldid = $nextid ?: -1;
 204                                 break;
 205                         case 'prev':
 206                                 # output previous revision, or nothing if there isn't one
 207                                 if ( !$oldid ) {
 208                                         # get the current revision so we can get the penultimate one
 209                                         $oldid = $this->page->getLatest();
 210                                 }
 211                                 $previd = $this->getTitle()->getPreviousRevisionID( $oldid );
 212                                 $oldid = $previd ?: -1;
 213                                 break;
 214                         case 'cur':
 215                                 $oldid = 0;
 216                                 break;
 217                 }
 218
 219                 return $oldid;
 220         }
 221
 222         /**
 223          * Get the content type to use for the response
 224          *
 225          * @return string
 226          */
 227         public function getContentType() {
 228                 $ctype = $this->getRequest()->getVal( 'ctype' );
 229
 230                 if ( $ctype == '' ) {
 231                         $gen = $this->getRequest()->getVal( 'gen' );
 232                         if ( $gen == 'js' ) {
 233                                 $ctype = 'text/javascript';
 234                         } elseif ( $gen == 'css' ) {
 235                                 $ctype = 'text/css';
 236                         }
 237                 }
 238
 239                 $allowedCTypes = [ 'text/x-wiki', 'text/javascript', 'text/css', 'application/x-zope-edit' ];
 240                 if ( $ctype == '' || !in_array( $ctype, $allowedCTypes ) ) {
 241                         $ctype = 'text/x-wiki';
 242                 }
 243
 244                 return $ctype;
 245         }
 246 }