329 lines
9.4 KiB
PHP
329 lines
9.4 KiB
PHP
<?php
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/**
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* PHP script to stream out an image thumbnail.
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*
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* @file
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* @ingroup Media
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*/
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define( 'MW_NO_OUTPUT_COMPRESSION', 1 );
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if ( isset( $_SERVER['MW_COMPILED'] ) ) {
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require( 'core/includes/WebStart.php' );
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} else {
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require( dirname( __FILE__ ) . '/includes/WebStart.php' );
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}
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// Don't use fancy mime detection, just check the file extension for jpg/gif/png
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$wgTrivialMimeDetection = true;
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if ( defined( 'THUMB_HANDLER' ) ) {
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// Called from thumb_handler.php via 404; extract params from the URI...
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wfThumbHandle404();
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} else {
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// Called directly, use $_REQUEST params
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wfThumbHandleRequest();
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}
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wfLogProfilingData();
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//--------------------------------------------------------------------------
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/**
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* Handle a thumbnail request via query parameters
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*
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* @return void
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*/
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function wfThumbHandleRequest() {
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$params = get_magic_quotes_gpc()
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? array_map( 'stripslashes', $_REQUEST )
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: $_REQUEST;
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wfStreamThumb( $params ); // stream the thumbnail
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}
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/**
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* Handle a thumbnail request via thumbnail file URL
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*
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* @return void
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*/
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function wfThumbHandle404() {
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# lighttpd puts the original request in REQUEST_URI, while sjs sets
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# that to the 404 handler, and puts the original request in REDIRECT_URL.
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if ( isset( $_SERVER['REDIRECT_URL'] ) ) {
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# The URL is un-encoded, so put it back how it was
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$uri = str_replace( "%2F", "/", urlencode( $_SERVER['REDIRECT_URL'] ) );
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# Just get the URI path (REDIRECT_URL is either a full URL or a path)
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if ( $uri[0] !== '/' ) {
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$bits = wfParseUrl( $uri );
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if ( $bits && isset( $bits['path'] ) ) {
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$uri = $bits['path'];
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}
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}
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} else {
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$uri = $_SERVER['REQUEST_URI'];
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}
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$params = wfExtractThumbParams( $uri ); // basic wiki URL param extracting
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if ( $params == null ) {
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wfThumbError( 404, 'The source file for the specified thumbnail does not exist.' );
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return;
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}
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wfStreamThumb( $params ); // stream the thumbnail
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}
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/**
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* Stream a thumbnail specified by parameters
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*
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* @param $params Array
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* @return void
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*/
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function wfStreamThumb( array $params ) {
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wfProfileIn( __METHOD__ );
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$headers = array(); // HTTP headers to send
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$fileName = isset( $params['f'] ) ? $params['f'] : '';
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unset( $params['f'] );
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// Backwards compatibility parameters
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if ( isset( $params['w'] ) ) {
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$params['width'] = $params['w'];
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unset( $params['w'] );
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}
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if ( isset( $params['p'] ) ) {
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$params['page'] = $params['p'];
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}
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unset( $params['r'] ); // ignore 'r' because we unconditionally pass File::RENDER
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// Is this a thumb of an archived file?
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$isOld = ( isset( $params['archived'] ) && $params['archived'] );
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unset( $params['archived'] );
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// Some basic input validation
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$fileName = strtr( $fileName, '\\/', '__' );
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// Actually fetch the image. Method depends on whether it is archived or not.
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if ( $isOld ) {
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// Format is <timestamp>!<name>
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$bits = explode( '!', $fileName, 2 );
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if ( count( $bits ) != 2 ) {
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wfThumbError( 404, wfMsg( 'badtitletext' ) );
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wfProfileOut( __METHOD__ );
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return;
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}
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$title = Title::makeTitleSafe( NS_FILE, $bits[1] );
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if ( !$title ) {
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wfThumbError( 404, wfMsg( 'badtitletext' ) );
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wfProfileOut( __METHOD__ );
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return;
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}
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$img = RepoGroup::singleton()->getLocalRepo()->newFromArchiveName( $title, $fileName );
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} else {
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$img = wfLocalFile( $fileName );
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}
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// Check permissions if there are read restrictions
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if ( !in_array( 'read', User::getGroupPermissions( array( '*' ) ), true ) ) {
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if ( !$img->getTitle() || !$img->getTitle()->userCan( 'read' ) ) {
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wfThumbError( 403, 'Access denied. You do not have permission to access ' .
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'the source file.' );
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wfProfileOut( __METHOD__ );
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return;
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}
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$headers[] = 'Cache-Control: private';
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$headers[] = 'Vary: Cookie';
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}
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// Check the source file storage path
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if ( !$img ) {
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wfThumbError( 404, wfMsg( 'badtitletext' ) );
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wfProfileOut( __METHOD__ );
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return;
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}
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if ( !$img->exists() ) {
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wfThumbError( 404, 'The source file for the specified thumbnail does not exist.' );
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wfProfileOut( __METHOD__ );
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return;
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}
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$sourcePath = $img->getPath();
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if ( $sourcePath === false ) {
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wfThumbError( 500, 'The source file is not locally accessible.' );
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wfProfileOut( __METHOD__ );
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return;
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}
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// Check IMS against the source file
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// This means that clients can keep a cached copy even after it has been deleted on the server
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if ( !empty( $_SERVER['HTTP_IF_MODIFIED_SINCE'] ) ) {
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// Fix IE brokenness
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$imsString = preg_replace( '/;.*$/', '', $_SERVER["HTTP_IF_MODIFIED_SINCE"] );
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// Calculate time
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wfSuppressWarnings();
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$imsUnix = strtotime( $imsString );
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wfRestoreWarnings();
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$sourceTsUnix = wfTimestamp( TS_UNIX, $img->getTimestamp() );
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if ( $sourceTsUnix <= $imsUnix ) {
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header( 'HTTP/1.1 304 Not Modified' );
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wfProfileOut( __METHOD__ );
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return;
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}
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}
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// Stream the file if it exists already...
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try {
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$thumbName = $img->thumbName( $params );
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if ( strlen( $thumbName ) ) { // valid params?
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// For 404 handled thumbnails, we only use the the base name of the URI
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// for the thumb params and the parent directory for the source file name.
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// Check that the zone relative path matches up so squid caches won't pick
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// up thumbs that would not be purged on source file deletion (bug 34231).
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if ( isset( $params['rel404'] ) // thumbnail was handled via 404
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&& urldecode( $params['rel404'] ) !== $img->getThumbRel( $thumbName ) )
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{
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wfThumbError( 404, 'The source file for the specified thumbnail does not exist.' );
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wfProfileOut( __METHOD__ );
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return;
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}
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$thumbPath = $img->getThumbPath( $thumbName );
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if ( $img->getRepo()->fileExists( $thumbPath ) ) {
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$img->getRepo()->streamFile( $thumbPath, $headers );
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wfProfileOut( __METHOD__ );
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return;
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}
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}
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} catch ( MWException $e ) {
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wfThumbError( 500, $e->getHTML() );
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wfProfileOut( __METHOD__ );
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return;
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}
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// Thumbnail isn't already there, so create the new thumbnail...
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try {
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$thumb = $img->transform( $params, File::RENDER_NOW );
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} catch ( Exception $ex ) {
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// Tried to select a page on a non-paged file?
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$thumb = false;
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}
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// Check for thumbnail generation errors...
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$errorMsg = false;
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if ( !$thumb ) {
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$errorMsg = wfMsgHtml( 'thumbnail_error', 'File::transform() returned false' );
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} elseif ( $thumb->isError() ) {
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$errorMsg = $thumb->getHtmlMsg();
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} elseif ( !$thumb->hasFile() ) {
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$errorMsg = wfMsgHtml( 'thumbnail_error', 'No path supplied in thumbnail object' );
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} elseif ( $thumb->fileIsSource() ) {
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$errorMsg = wfMsgHtml( 'thumbnail_error',
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'Image was not scaled, is the requested width bigger than the source?' );
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}
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if ( $errorMsg !== false ) {
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wfThumbError( 500, $errorMsg );
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} else {
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// Stream the file if there were no errors
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$thumb->streamFile( $headers );
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}
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wfProfileOut( __METHOD__ );
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}
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/**
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* Extract the required params for thumb.php from the thumbnail request URI.
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* At least 'width' and 'f' should be set if the result is an array.
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*
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* @param $uri String Thumbnail request URI path
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* @return Array|null associative params array or null
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*/
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function wfExtractThumbParams( $uri ) {
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$repo = RepoGroup::singleton()->getLocalRepo();
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$zoneURI = $repo->getZoneUrl( 'thumb' );
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if ( substr( $zoneURI, 0, 1 ) !== '/' ) {
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$bits = wfParseUrl( $zoneURI );
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if ( $bits && isset( $bits['path'] ) ) {
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$zoneURI = $bits['path'];
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} else {
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return null;
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}
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}
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$zoneUrlRegex = preg_quote( $zoneURI );
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$hashDirRegex = $subdirRegex = '';
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for ( $i = 0; $i < $repo->getHashLevels(); $i++ ) {
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$subdirRegex .= '[0-9a-f]';
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$hashDirRegex .= "$subdirRegex/";
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}
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$thumbUrlRegex = "!^$zoneUrlRegex/((archive/|temp/)?$hashDirRegex([^/]*)/([^/]*))$!";
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// Check if this is a valid looking thumbnail request...
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if ( preg_match( $thumbUrlRegex, $uri, $matches ) ) {
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list( /* all */, $rel, $archOrTemp, $filename, $thumbname ) = $matches;
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$filename = urldecode( $filename );
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$thumbname = urldecode( $thumbname );
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$params = array( 'f' => $filename, 'rel404' => $rel );
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if ( $archOrTemp == 'archive/' ) {
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$params['archived'] = 1;
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} elseif ( $archOrTemp == 'temp/' ) {
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$params['temp'] = 1;
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}
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// Check if the parameters can be extracted from the thumbnail name...
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if ( preg_match( '!^(page(\d*)-)*(\d*)px-[^/]*$!', $thumbname, $matches ) ) {
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list( /* all */, $pagefull, $pagenum, $size ) = $matches;
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$params['width'] = $size;
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if ( $pagenum ) {
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$params['page'] = $pagenum;
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}
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return $params; // valid thumbnail URL
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// Hooks return false if they manage to *resolve* the parameters
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} elseif ( !wfRunHooks( 'ExtractThumbParameters', array( $thumbname, &$params ) ) ) {
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return $params; // valid thumbnail URL (via extension or config)
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}
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}
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return null; // not a valid thumbnail URL
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}
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/**
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* Output a thumbnail generation error message
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*
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* @param $status integer
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* @param $msg string
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* @return void
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*/
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function wfThumbError( $status, $msg ) {
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global $wgShowHostnames;
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header( 'Cache-Control: no-cache' );
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header( 'Content-Type: text/html; charset=utf-8' );
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if ( $status == 404 ) {
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header( 'HTTP/1.1 404 Not found' );
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} elseif ( $status == 403 ) {
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header( 'HTTP/1.1 403 Forbidden' );
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header( 'Vary: Cookie' );
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} else {
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header( 'HTTP/1.1 500 Internal server error' );
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}
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if ( $wgShowHostnames ) {
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$url = htmlspecialchars( isset( $_SERVER['REQUEST_URI'] ) ? $_SERVER['REQUEST_URI'] : '' );
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$hostname = htmlspecialchars( wfHostname() );
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$debug = "<!-- $url -->\n<!-- $hostname -->\n";
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} else {
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$debug = "";
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}
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echo <<<EOT
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<html><head><title>Error generating thumbnail</title></head>
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<body>
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<h1>Error generating thumbnail</h1>
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<p>
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$msg
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</p>
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$debug
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</body>
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</html>
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EOT;
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}
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