includes/RawPage.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 HistoryPage and SpecialExport
   9  *
  10  * License: GPL (http://www.gnu.org/copyleft/gpl.html)
  11  *
  12  * @author Gabriel Wicke <wicke@wikidev.net>
  13  * @file
  14  */
  15
  16 /**
  17  * A simple method to retrieve the plain source of an article,
  18  * using "action=raw" in the GET request string.
  19  */
  20 class RawPage {
  21         var $mArticle, $mTitle, $mRequest;
  22         var $mOldId, $mGen, $mCharset, $mSection;
  23         var $mSmaxage, $mMaxage;
  24         var $mContentType, $mExpandTemplates;
  25
  26         function __construct( Article $article, $request = false ) {
  27                 global $wgRequest, $wgInputEncoding, $wgSquidMaxage, $wgJsMimeType, $wgGroupPermissions;
  28
  29                 $allowedCTypes = array('text/x-wiki', $wgJsMimeType, 'text/css', 'application/x-zope-edit');
  30                 $this->mArticle = $article;
  31                 $this->mTitle = $article->mTitle;
  32
  33                 if( $request === false ) {
  34                         $this->mRequest = $wgRequest;
  35                 } else {
  36                         $this->mRequest = $request;
  37                 }
  38
  39                 $ctype = $this->mRequest->getVal( 'ctype' );
  40                 $smaxage = $this->mRequest->getIntOrNull( 'smaxage' );
  41                 $maxage = $this->mRequest->getInt( 'maxage', $wgSquidMaxage );
  42
  43                 $this->mExpandTemplates = $this->mRequest->getVal( 'templates' ) === 'expand';
  44                 $this->mUseMessageCache = $this->mRequest->getBool( 'usemsgcache' );
  45
  46                 $this->mSection = $this->mRequest->getIntOrNull( 'section' );
  47
  48                 $oldid = $this->mRequest->getInt( 'oldid' );
  49
  50                 switch( $wgRequest->getText( 'direction' ) ) {
  51                         case 'next':
  52                                 # output next revision, or nothing if there isn't one
  53                                 if( $oldid ) {
  54                                         $oldid = $this->mTitle->getNextRevisionId( $oldid );
  55                                 }
  56                                 $oldid = $oldid ? $oldid : -1;
  57                                 break;
  58                         case 'prev':
  59                                 # output previous revision, or nothing if there isn't one
  60                                 if( ! $oldid ) {
  61                                         # get the current revision so we can get the penultimate one
  62                                         $this->mArticle->getTouched();
  63                                         $oldid = $this->mArticle->mLatest;
  64                                 }
  65                                 $prev = $this->mTitle->getPreviousRevisionId( $oldid );
  66                                 $oldid = $prev ? $prev : -1 ;
  67                                 break;
  68                         case 'cur':
  69                                 $oldid = 0;
  70                                 break;
  71                 }
  72                 $this->mOldId = $oldid;
  73
  74                 # special case for 'generated' raw things: user css/js
  75                 $gen = $this->mRequest->getVal( 'gen' );
  76
  77                 if( $gen == 'css' ) {
  78                         $this->mGen = $gen;
  79                         if( is_null( $smaxage ) ) $smaxage = $wgSquidMaxage;
  80                         if($ctype == '') $ctype = 'text/css';
  81                 } else {
  82                         $this->mGen = false;
  83                 }
  84                 $this->mCharset = $wgInputEncoding;
  85
  86                 # Force caching for CSS and JS raw content, default: 5 minutes
  87                 if( is_null($smaxage) and ($ctype=='text/css' or $ctype==$wgJsMimeType) ) {
  88                         global $wgForcedRawSMaxage;
  89                         $this->mSmaxage = intval($wgForcedRawSMaxage);
  90                 } else {
  91                         $this->mSmaxage = intval( $smaxage );
  92                 }
  93                 $this->mMaxage = $maxage;
  94
  95                 # Output may contain user-specific data;
  96                 # vary generated content for open sessions and private wikis
  97                 if( $this->mGen or !$wgGroupPermissions['*']['read'] ) {
  98                         $this->mPrivateCache = $this->mSmaxage == 0 || session_id() != '';
  99                 } else {
 100                         $this->mPrivateCache = false;
 101                 }
 102
 103                 if( $ctype == '' or ! in_array( $ctype, $allowedCTypes ) ) {
 104                         $this->mContentType = 'text/x-wiki';
 105                 } else {
 106                         $this->mContentType = $ctype;
 107                 }
 108         }
 109
 110         function view() {
 111                 global $wgOut, $wgRequest;
 112
 113                 if( $wgRequest->isPathInfoBad() ) {
 114                         # Internet Explorer will ignore the Content-Type header if it
 115                         # thinks it sees a file extension it recognizes. Make sure that
 116                         # all raw requests are done through the script node, which will
 117                         # have eg '.php' and should remain safe.
 118                         #
 119                         # We used to redirect to a canonical-form URL as a general
 120                         # backwards-compatibility / good-citizen nice thing. However
 121                         # a lot of servers are set up in buggy ways, resulting in
 122                         # redirect loops which hang the browser until the CSS load
 123                         # times out.
 124                         #
 125                         # Just return a 403 Forbidden and get it over with.
 126                         wfHttpError( 403, 'Forbidden',
 127                                 'Invalid file extension found in PATH_INFO. ' .
 128                                 'Raw pages must be accessed through the primary script entry point.' );
 129                         return;
 130                 }
 131
 132                 header( "Content-type: ".$this->mContentType.'; charset='.$this->mCharset );
 133                 # allow the client to cache this for 24 hours
 134                 $mode = $this->mPrivateCache ? 'private' : 'public';
 135                 header( 'Cache-Control: '.$mode.', s-maxage='.$this->mSmaxage.', max-age='.$this->mMaxage );
 136
 137                 global $wgUseFileCache;
 138                 if( $wgUseFileCache and HTMLFileCache::useFileCache() ) {
 139                         $cache = new HTMLFileCache( $this->mTitle, 'raw' );
 140                         if( $cache->isFileCacheGood( /* Assume up to date */ ) ) {
 141                                 $cache->loadFromFileCache();
 142                                 $wgOut->disable();
 143                                 return;
 144                         } else {
 145                                 ob_start( array(&$cache, 'saveToFileCache' ) );
 146                         }
 147                 }
 148
 149                 $text = $this->getRawText();
 150
 151                 if( !wfRunHooks( 'RawPageViewBeforeOutput', array( &$this, &$text ) ) ) {
 152                         wfDebug( __METHOD__ . ": RawPageViewBeforeOutput hook broke raw page output.\n" );
 153                 }
 154
 155                 echo $text;
 156                 $wgOut->disable();
 157         }
 158
 159         function getRawText() {
 160                 global $wgUser, $wgOut;
 161                 if( $this->mGen ) {
 162                         $sk = $wgUser->getSkin();
 163                         if( !StubObject::isRealObject( $wgOut ) )
 164                                 $wgOut->_unstub( 2 );
 165                         $sk->initPage( $wgOut );
 166                         if( $this->mGen == 'css' ) {
 167                                 return $sk->generateUserStylesheet();
 168                         }
 169                 } else {
 170                         return $this->getArticleText();
 171                 }
 172         }
 173
 174         function getArticleText() {
 175                 $found = false;
 176                 $text = '';
 177                 if( $this->mTitle ) {
 178                         // If it's a MediaWiki message we can just hit the message cache
 179                         if( $this->mUseMessageCache && $this->mTitle->getNamespace() == NS_MEDIAWIKI ) {
 180                                 $key = $this->mTitle->getDBkey();
 181                                 $text = wfMsgForContentNoTrans( $key );
 182                                 # If the message doesn't exist, return a blank
 183                                 if( wfEmptyMsg( $key, $text ) )
 184                                         $text = '';
 185                                 $found = true;
 186                         } else {
 187                                 // Get it from the DB
 188                                 $rev = Revision::newFromTitle( $this->mTitle, $this->mOldId );
 189                                 if( $rev ) {
 190                                         $lastmod = wfTimestamp( TS_RFC2822, $rev->getTimestamp() );
 191                                         header( "Last-modified: $lastmod" );
 192
 193                                         if( !is_null($this->mSection ) ) {
 194                                                 global $wgParser;
 195                                                 $text = $wgParser->getSection ( $rev->getText(), $this->mSection );
 196                                         } else
 197                                                 $text = $rev->getText();
 198                                         $found = true;
 199                                 }
 200                         }
 201                 }
 202
 203                 # Bad title or page does not exist
 204                 if( !$found && $this->mContentType == 'text/x-wiki' ) {
 205                         # Don't return a 404 response for CSS or JavaScript;
 206                         # 404s aren't generally cached and it would create
 207                         # extra hits when user CSS/JS are on and the user doesn't
 208                         # have the pages.
 209                         header( "HTTP/1.0 404 Not Found" );
 210                 }
 211
 212                 // Special-case for empty CSS/JS
 213                 //
 214                 // Internet Explorer for Mac handles empty files badly;
 215                 // particularly so when keep-alive is active. It can lead
 216                 // to long timeouts as it seems to sit there waiting for
 217                 // more data that never comes.
 218                 //
 219                 // Give it a comment...
 220                 if( strlen( $text ) == 0 &&
 221                         ($this->mContentType == 'text/css' ||
 222                                 $this->mContentType == 'text/javascript' ) ) {
 223                         return "/* Empty */";
 224                 }
 225
 226                 return $this->parseArticleText( $text );
 227         }
 228
 229         function parseArticleText( $text ) {
 230                 if( $text === '' )
 231                         return '';
 232                 else
 233                         if( $this->mExpandTemplates ) {
 234                                 global $wgParser;
 235                                 return $wgParser->preprocess( $text, $this->mTitle, new ParserOptions() );
 236                         } else
 237                                 return $text;
 238         }
 239 }