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<?php
/**
* Utilities for handling HTTP related tasks
*
* @license GPL 2 (http://www.gnu.org/licenses/gpl.html)
* @author Andreas Gohr <andi@splitbrain.org>
*/
define('HTTP_MULTIPART_BOUNDARY','D0KuW1K1B0uNDARY');
define('HTTP_HEADER_LF',"\r\n");
define('HTTP_CHUNK_SIZE',16*1024);
/**
* Checks and sets HTTP headers for conditional HTTP requests
*
* @author Simon Willison <swillison@gmail.com>
* @link http://simon.incutio.com/archive/2003/04/23/conditionalGet
* @param timestamp $timestamp lastmodified time of the cache file
* @returns void or exits with previously header() commands executed
*/
function http_conditionalRequest($timestamp){
// A PHP implementation of conditional get, see
// http://fishbowl.pastiche.org/archives/001132.html
$last_modified = substr(gmdate('r', $timestamp), 0, -5).'GMT';
$etag = '"'.md5($last_modified).'"';
// Send the headers
header("Last-Modified: $last_modified");
header("ETag: $etag");
// See if the client has provided the required headers
if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE'])){
$if_modified_since = stripslashes($_SERVER['HTTP_IF_MODIFIED_SINCE']);
}else{
$if_modified_since = false;
}
if (isset($_SERVER['HTTP_IF_NONE_MATCH'])){
$if_none_match = stripslashes($_SERVER['HTTP_IF_NONE_MATCH']);
}else{
$if_none_match = false;
}
if (!$if_modified_since && !$if_none_match){
return;
}
// At least one of the headers is there - check them
if ($if_none_match && $if_none_match != $etag) {
return; // etag is there but doesn't match
}
if ($if_modified_since && $if_modified_since != $last_modified) {
return; // if-modified-since is there but doesn't match
}
// Nothing has changed since their last request - serve a 304 and exit
header('HTTP/1.0 304 Not Modified');
// don't produce output, even if compression is on
@ob_end_clean();
exit;
}
/**
* Let the webserver send the given file vi x-sendfile method
*
* @author Chris Smith <chris.eureka@jalakai.co.uk>
* @returns void or exits with previously header() commands executed
*/
function http_sendfile($file) {
global $conf;
//use x-sendfile header to pass the delivery to compatible webservers
if($conf['xsendfile'] == 1){
header("X-LIGHTTPD-send-file: $file");
ob_end_clean();
exit;
}elseif($conf['xsendfile'] == 2){
header("X-Sendfile: $file");
ob_end_clean();
exit;
}elseif($conf['xsendfile'] == 3){
header("X-Accel-Redirect: $file");
ob_end_clean();
exit;
}
return false;
}
/**
* Send file contents supporting rangeRequests
*
* This function exits the running script
*
* @param ressource $fh - file handle for an already open file
* @param int $size - size of the whole file
* @param int $mime - MIME type of the file
*
* @author Andreas Gohr <andi@splitbrain.org>
*/
function http_rangeRequest($fh,$size,$mime){
$ranges = array();
$isrange = false;
header('Accept-Ranges: bytes');
if(!isset($_SERVER['HTTP_RANGE'])){
// no range requested - send the whole file
$ranges[] = array(0,$size,$size);
}else{
$t = explode('=', $_SERVER['HTTP_RANGE']);
if (!$t[0]=='bytes') {
// we only understand byte ranges - send the whole file
$ranges[] = array(0,$size,$size);
}else{
$isrange = true;
// handle multiple ranges
$r = explode(',',$t[1]);
foreach($r as $x){
$p = explode('-', $x);
$start = (int)$p[0];
$end = (int)$p[1];
if (!$end) $end = $size - 1;
if ($start > $end || $start > $size || $end > $size){
header('HTTP/1.1 416 Requested Range Not Satisfiable');
print 'Bad Range Request!';
exit;
}
$len = $end - $start + 1;
$ranges[] = array($start,$end,$len);
}
}
}
$parts = count($ranges);
// now send the type and length headers
if(!$isrange){
header("Content-Type: $mime",true);
}else{
header('HTTP/1.1 206 Partial Content');
if($parts == 1){
header("Content-Type: $mime",true);
}else{
header('Content-Type: multipart/byteranges; boundary='.HTTP_MULTIPART_BOUNDARY,true);
}
}
// send all ranges
for($i=0; $i<$parts; $i++){
list($start,$end,$len) = $ranges[$i];
// multipart or normal headers
if($parts > 1){
echo HTTP_HEADER_LF.'--'.HTTP_MULTIPART_BOUNDARY.HTTP_HEADER_LF;
echo "Content-Type: $mime".HTTP_HEADER_LF;
echo "Content-Range: bytes $start-$end/$size".HTTP_HEADER_LF;
echo HTTP_HEADER_LF;
}else{
header("Content-Length: $len");
if($isrange){
header("Content-Range: bytes $start-$end/$size");
}
}
// send file content
fseek($fh,$start); //seek to start of range
$chunk = ($len > HTTP_CHUNK_SIZE) ? HTTP_CHUNK_SIZE : $len;
while (!feof($fh) && $chunk > 0) {
@set_time_limit(30); // large files can take a lot of time
print fread($fh, $chunk);
flush();
$len -= $chunk;
$chunk = ($len > HTTP_CHUNK_SIZE) ? HTTP_CHUNK_SIZE : $len;
}
}
if($parts > 1){
echo HTTP_HEADER_LF.'--'.HTTP_MULTIPART_BOUNDARY.'--'.HTTP_HEADER_LF;
}
// everything should be done here, exit
exit;
}
/**
* Check for a gzipped version and create if necessary
*
* return true if there exists a gzip version of the uncompressed file
* (samepath/samefilename.sameext.gz) created after the uncompressed file
*
* @author Chris Smith <chris.eureka@jalakai.co.uk>
*/
function http_gzip_valid($uncompressed_file) {
$gzip = $uncompressed_file.'.gz';
if (filemtime($gzip) < filemtime($uncompressed_file)) { // filemtime returns false (0) if file doesn't exist
return copy($uncompressed_file, 'compress.zlib://'.$gzip);
}
return true;
}
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