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<?php
/**
* PHP script to stream out an image thumbnail.
*
* @file
* @ingroup Media
*/
define( 'MW_NO_OUTPUT_COMPRESSION', 1 );
require_once( './includes/WebStart.php' );
$wgTrivialMimeDetection = true; //don't use fancy mime detection, just check the file extension for jpg/gif/png.
require_once( "$IP/includes/StreamFile.php" );
wfThumbMain();
wfLogProfilingData();
//--------------------------------------------------------------------------
function wfThumbMain() {
wfProfileIn( __METHOD__ );
$headers = array();
// Get input parameters
if ( get_magic_quotes_gpc() ) {
$params = array_map( 'stripslashes', $_REQUEST );
} else {
$params = $_REQUEST;
}
$fileName = isset( $params['f'] ) ? $params['f'] : '';
unset( $params['f'] );
// Backwards compatibility parameters
if ( isset( $params['w'] ) ) {
$params['width'] = $params['w'];
unset( $params['w'] );
}
if ( isset( $params['p'] ) ) {
$params['page'] = $params['p'];
}
unset( $params['r'] );
// Is this a thumb of an archived file?
$isOld = (isset( $params['archived'] ) && $params['archived']);
unset( $params['archived'] );
// Some basic input validation
$fileName = strtr( $fileName, '\\/', '__' );
// Actually fetch the image. Method depends on whether it is archived or not.
if( $isOld ) {
// Format is <timestamp>!<name>
$bits = explode( '!', $fileName, 2 );
if( !isset($bits[1]) ) {
wfThumbError( 404, wfMsg( 'badtitletext' ) );
return;
}
$title = Title::makeTitleSafe( NS_FILE, $bits[1] );
if( is_null($title) ) {
wfThumbError( 404, wfMsg( 'badtitletext' ) );
return;
}
$img = RepoGroup::singleton()->getLocalRepo()->newFromArchiveName( $title, $fileName );
} else {
$img = wfLocalFile( $fileName );
}
// Check permissions if there are read restrictions
if ( !in_array( 'read', User::getGroupPermissions( array( '*' ) ), true ) ) {
if ( !$img->getTitle()->userCanRead() ) {
wfThumbError( 403, 'Access denied. You do not have permission to access ' .
'the source file.' );
return;
}
$headers[] = 'Cache-Control: private';
$headers[] = 'Vary: Cookie';
}
if ( !$img ) {
wfThumbError( 404, wfMsg( 'badtitletext' ) );
return;
}
if ( !$img->exists() ) {
wfThumbError( 404, 'The source file for the specified thumbnail does not exist.' );
return;
}
$sourcePath = $img->getPath();
if ( $sourcePath === false ) {
wfThumbError( 500, 'The source file is not locally accessible.' );
return;
}
// Check IMS against the source file
// This means that clients can keep a cached copy even after it has been deleted on the server
if ( !empty( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) ) {
// Fix IE brokenness
$imsString = preg_replace( '/;.*$/', '', $_SERVER["HTTP_IF_MODIFIED_SINCE"] );
// Calculate time
wfSuppressWarnings();
$imsUnix = strtotime( $imsString );
wfRestoreWarnings();
$stat = @stat( $sourcePath );
if ( $stat['mtime'] <= $imsUnix ) {
header( 'HTTP/1.1 304 Not Modified' );
return;
}
}
// Stream the file if it exists already
try {
if ( false != ( $thumbName = $img->thumbName( $params ) ) ) {
$thumbPath = $img->getThumbPath( $thumbName );
if ( is_file( $thumbPath ) ) {
wfStreamFile( $thumbPath, $headers );
return;
}
}
} catch ( MWException $e ) {
wfThumbError( 500, $e->getHTML() );
return;
}
try {
$thumb = $img->transform( $params, File::RENDER_NOW );
} catch( Exception $ex ) {
// Tried to select a page on a non-paged file?
$thumb = false;
}
$errorMsg = false;
if ( !$thumb ) {
$errorMsg = wfMsgHtml( 'thumbnail_error', 'File::transform() returned false' );
} elseif ( $thumb->isError() ) {
$errorMsg = $thumb->getHtmlMsg();
} elseif ( !$thumb->getPath() ) {
$errorMsg = wfMsgHtml( 'thumbnail_error', 'No path supplied in thumbnail object' );
} elseif ( $thumb->getPath() == $img->getPath() ) {
$errorMsg = wfMsgHtml( 'thumbnail_error', 'Image was not scaled, ' .
'is the requested width bigger than the source?' );
} else {
wfStreamFile( $thumb->getPath(), $headers );
}
if ( $errorMsg !== false ) {
wfThumbError( 500, $errorMsg );
}
wfProfileOut( __METHOD__ );
}
function wfThumbError( $status, $msg ) {
global $wgShowHostnames;
header( 'Cache-Control: no-cache' );
header( 'Content-Type: text/html; charset=utf-8' );
if ( $status == 404 ) {
header( 'HTTP/1.1 404 Not found' );
} elseif ( $status == 403 ) {
header( 'HTTP/1.1 403 Forbidden' );
header( 'Vary: Cookie' );
} else {
header( 'HTTP/1.1 500 Internal server error' );
}
if( $wgShowHostnames ) {
$url = htmlspecialchars( @$_SERVER['REQUEST_URI'] );
$hostname = htmlspecialchars( wfHostname() );
$debug = "<!-- $url -->\n<!-- $hostname -->\n";
} else {
$debug = "";
}
echo <<<EOT
<html><head><title>Error generating thumbnail</title></head>
<body>
<h1>Error generating thumbnail</h1>
<p>
$msg
</p>
$debug
</body>
</html>
EOT;
}
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