268 lines
7.9 KiB
PHP
268 lines
7.9 KiB
PHP
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<?php
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/**
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* This file is used to send gzipped Javascripts and Stylesheets to the browser
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*
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* It expects three parameters:
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*
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* gzip (can be 1 or 0, for yes or no; default: 0)
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* subdir[INDEX] (relative directory from /components/com_virtuemart/js)
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* file[INDEX] (filename only)
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* where INDEX is the actual number of the file to be included, so you can include multiple scripts at a time
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*
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* @version $Id: fetchscript.php 196 2011-06-14 08:00:04Z soeren $
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* @package eXtplorer
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* @copyright Copyright (C) 2006-2007 Soeren Eberhardt. All rights reserved.
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* @license http://www.gnu.org/copyleft/gpl.html GNU/GPL, see LICENSE.php
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* VirtueMart is free software. This version may have been modified pursuant
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* to the GNU General Public License, and as distributed it includes or
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* is derivative of works licensed under the GNU General Public License or
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* other free or open source software licenses.
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*
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* http://virtuemart.net
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*/
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/**
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* Initialise GZIP
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* @author Mambo / Joomla Project
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*/
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function initGzip() {
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global $do_gzip_compress;
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$gzip = isset( $_GET['gzip'] ) ? (boolean)$_GET['gzip'] : false;
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$do_gzip_compress = FALSE;
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if ($gzip) {
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$phpver = phpversion();
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$useragent = isset( $_SERVER['HTTP_USER_AGENT'] ) ? $_SERVER['HTTP_USER_AGENT'] : '';
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$canZip = isset( $_SERVER['HTTP_ACCEPT_ENCODING'] ) ? $_SERVER['HTTP_ACCEPT_ENCODING'] : '';
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$gzip_check = 0;
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$zlib_check = 0;
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$gz_check = 0;
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$zlibO_check = 0;
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$sid_check = 0;
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if ( strpos( $canZip, 'gzip' ) !== false) {
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$gzip_check = 1;
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}
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if ( extension_loaded( 'zlib' ) ) {
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$zlib_check = 1;
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}
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if ( function_exists('ob_gzhandler') ) {
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$gz_check = 1;
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}
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if ( ini_get('zlib.output_compression') ) {
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$zlibO_check = 1;
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}
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if ( $phpver >= '4.0.4pl1' && ( strpos($useragent,'compatible') !== false || strpos($useragent,'Gecko') !== false ) ) {
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// Check for gzip header or norton internet securities
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if ( ( $gzip_check || isset( $_SERVER['---------------']) ) && $zlib_check && $gz_check && !$zlibO_check ) {
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// You cannot specify additional output handlers if
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// zlib.output_compression is activated here
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ob_start( 'ob_gzhandler' );
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return;
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}
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} else if ( $phpver > '4.0' ) {
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if ( $gzip_check ) {
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if ( $zlib_check ) {
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$do_gzip_compress = TRUE;
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ob_start();
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ob_implicit_flush(0);
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header( 'Content-Encoding: gzip' );
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return;
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}
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}
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}
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}
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ob_start();
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}
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/**
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* Perform GZIP
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* @author Mambo / Joomla! project
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*/
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function doGzip() {
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global $do_gzip_compress;
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if ( $do_gzip_compress ) {
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/**
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*Borrowed from php.net!
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*/
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$gzip_contents = ob_get_contents();
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ob_end_clean();
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$gzip_size = strlen($gzip_contents);
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$gzip_crc = crc32($gzip_contents);
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$gzip_contents = gzcompress($gzip_contents, 9);
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$gzip_contents = substr($gzip_contents, 0, strlen($gzip_contents) - 4);
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echo "\x1f\x8b\x08\x00\x00\x00\x00\x00";
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echo $gzip_contents;
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echo pack('V', $gzip_crc);
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echo pack('V', $gzip_size);
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} else {
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ob_end_flush();
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}
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}
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/**
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* This function fixes the URLs used in the CSS file
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* This is necessary, because this file is (usually) located somewhere else than the CSS file! That makes
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* relative URL references point to wrong directories - so we need to fix that!
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*/
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function cssUrl( $ref, $subdir ) {
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$ref = str_replace( "'", '', stripslashes( $ref ));
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$ref = trim( str_replace( '"', '', $ref) );
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// Absolute References don't need to be fixed
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if( substr( $ref, 0, 4 ) == 'http' ) {
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return 'url( "'. $ref.'" )';
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}
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chdir( dirname( __FILE__ ).'/'.$subdir );
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$ref = str_replace( dirname( __FILE__ ), '', realpath( $ref ));
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$ref = str_replace( "\\", '/', $ref );
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return 'url( "'. substr( $ref, 1 ).'" )';
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}
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/**
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* Checks and sets HTTP headers for conditional HTTP requests
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* Borrowed from DokuWiki (/lib/exe/fetch.php)
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* @author Simon Willison <swillison@gmail.com>
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* @link http://simon.incutio.com/archive/2003/04/23/conditionalGet
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*/
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function http_conditionalRequest($timestamp){
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// A PHP implementation of conditional get, see
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// http://fishbowl.pastiche.org/archives/001132.html
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$last_modified = gmdate( 'D, d M Y H:i:s', $timestamp ) . ' GMT';
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$etag = '"'.md5($last_modified).'"';
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// Send the headers
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header("Last-Modified: $last_modified");
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header("ETag: $etag");
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// See if the client has provided the required headers
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$if_modified_since = isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) ?
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stripslashes($_SERVER['HTTP_IF_MODIFIED_SINCE']) :
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false;
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$if_none_match = isset($_SERVER['HTTP_IF_NONE_MATCH']) ?
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stripslashes($_SERVER['HTTP_IF_NONE_MATCH']) :
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false;
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if (!$if_modified_since && !$if_none_match) {
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return;
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}
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// At least one of the headers is there - check them
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if ($if_none_match && $if_none_match != $etag) {
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return; // etag is there but doesn't match
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}
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if ($if_modified_since && $if_modified_since != $last_modified) {
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return; // if-modified-since is there but doesn't match
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}
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// Nothing has changed since their last request - serve a 304 and exit
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header('HTTP/1.0 304 Not Modified');
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exit;
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}
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initGzip();
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$base_dir = dirname( __FILE__ );
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$subdirs = @$_GET['subdir'];
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if( !is_array( $subdirs ) && !empty( $subdirs )) {
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$subdirs = array( $subdirs );
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}
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$files = @$_GET['file'];
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if( !is_array( $files ) && !empty( $files )) {
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$files = array( $files );
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}
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if( empty( $files ) || sizeof($files) != sizeof( $subdirs )) {
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header("HTTP/1.0 400 Bad Request");
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echo 'Bad request';
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exit;
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}
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$countFiles = sizeof($files);
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$newest_mdate = 0;
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for( $i = 0; $i < $countFiles; $i++ ) {
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if( empty( $files[$i] )) continue;
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$file = $files[$i];
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$subdir = $subdirs[$i];
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$dir = realpath( $base_dir . '/' . $subdir );
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$file = $dir . '/' . basename( $file );
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if( !file_exists( $file ) || (!stristr( $dir, $base_dir ) && !stristr( $dir, "/usr/share/javascript") && !stristr( $dir, "/usr/share/yui")) ) {
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if( $countFiles == 1 ) {
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header("HTTP/1.0 404 Not Found");
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echo 'Not Found';
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exit;
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}
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continue;
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}
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$newest_mdate = max( filemtime( $file ), $newest_mdate );
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}
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// This function quits the page load if the browser has a cached version of the requested script.
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// It then returns a 304 Not Modified header
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http_conditionalRequest( $newest_mdate );
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// here we need to send the script or stylesheet
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$processed_files = 0;
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for( $i = 0; $i < $countFiles; $i++ ) {
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$file = addslashes($files[$i]);// fix by colonelxc
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$subdir = $subdirs[$i];
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$dir = realpath( $base_dir . '/' . $subdir );
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$file = $dir . '/' . basename( $file );
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if( !file_exists( $file ) || (!stristr( $dir, $base_dir ) && !stristr( $dir, "/usr/share/javascript") && !stristr( $dir, "/usr/share/yui")) || !is_readable( $file )) {
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continue;
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}
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$processed_files++;
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$fileinfo = pathinfo( $file );
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switch ( $fileinfo['extension']) {
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case 'css':
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$mime_type = 'text/css';
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header( 'Content-Type: '.$mime_type.';');
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$css = implode( '', file( $file ));
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$str_css = preg_replace("/url\((.+?)\)/ie","cssUrl('\\1', '$subdir')", $css);
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echo $str_css;
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break;
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case 'js':
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$mime_type = 'application/x-javascript';
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header( 'Content-Type: '.$mime_type.';');
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readfile( $file );
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break;
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default:
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continue;
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}
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}
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if( $processed_files == 0 ) {
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if( !file_exists( $file ) ) {
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header("HTTP/1.0 404 Not Found");
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echo 'Not Found';
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exit;
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}
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if( !is_readable( $file ) ) {
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header("HTTP/1.0 500 Internal Server Error");
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echo "Could not read ".basename($file)." - bad permissions?";
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exit;
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}
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}
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// Tell the user agent to cache this script/stylesheet for an hour
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$age = 3600;
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header( 'Expires: '.gmdate( 'D, d M Y H:i:s', time()+ $age ) . ' GMT' );
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header( 'Last-Modified: ' . gmdate( 'D, d M Y H:i:s', @filemtime( $file ) ) . ' GMT' );
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header( 'Cache-Control: public, max-age='.$age.', must-revalidate, post-check=0, pre-check=0' );
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header( 'Pragma: public' );
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doGzip();
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exit;
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?>
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