Subversion Repositories php_utils

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Regard whitespace Rev 6 → Rev 7

/trunk/VtsBrowserDownload.class.php
0,0 → 1,153
<?php
 
/*
* VtsBrowserDownload.class.php
* Copyright 2021 Daniel Marschall, ViaThinkSoft
* Revision: 2021-05-21
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
 
class VtsBrowserDownload {
 
private static function wellKnownInlineFile($file_extension) {
// Windows Firefox: Browser decided wheater to display or download by looking at the mime type (inline disposition with explicit filename works)
// Windows Chrome: Browser decided wheater to display or download by looking at the mime type (inline disposition with explicit filename DOES NOT WORK)
 
//$file_extension = strtolower($file_extension);
//$array_listen = array('txt', 'mp3', 'wav', 'mid', 'ogg', 'pdf', 'avi', 'mov', 'mp4', 'mpeg', 'mpg', 'swf', 'gif', 'jpg', 'jpeg', 'png');
//return in_array($file_extension, $array_listen);
 
return true;
}
 
private static function getMimeType($file_extension) {
$file_extension = strtolower($file_extension);
return VtsFileTypeDetect::getMimeType('dummy.'.$file_extension);
}
 
public static function output_file($file, $mime_type='', $inline_mode=2/*2=auto*/) {
// Partitally taken from:
// - https://stackoverflow.com/a/13821992/488539
// - https://stackoverflow.com/a/32885706/488539
 
if (connection_status() != 0) return false;
 
$file_extension = pathinfo($file, PATHINFO_EXTENSION);
 
if(!is_readable($file)) throw new Exception('File not found or inaccessible!');
$size = filesize($file);
$name = rawurldecode(basename($file));
 
if ($mime_type == '') {
$mime_type = self::getMimeType($file_extension);
if (!$mime_type) $mime_type='application/force-download';
}
 
 
 
while (ob_get_level() > 0) @ob_end_clean();
 
switch ($inline_mode) {
 
case 0:
$disposition = 'attachment';
break;
 
case 1:
$disposition = 'inline';
break;
 
case 2:
$disposition = self::wellKnownInlineFile($file_extension) ? 'inline' : 'attachment';
break;
 
default:
throw new Exception('Invalid value for inline_mode');
}
 
if(ini_get('zlib.output_compression')){
ini_set('zlib.output_compression', 'Off');
}
header('Content-Type: ' . $mime_type);
 
$ua = isset($_SERVER['HTTP_USER_AGENT']) ? strtoupper($_SERVER['HTTP_USER_AGENT']) : '';
if (strstr($ua, 'MSIE')) {
$name_msie = preg_replace('/\./', '%2e', $name, substr_count($name, '.') - 1);
header('Content-Disposition: '.$disposition.';filename="'.$name_msie.'"');
} else if (strstr($ua, 'FIREFOX')) {
// TODO: Implement "encodeRFC5987ValueChars" described at https://developer.mozilla.org/de/docs/Web/JavaScript/Reference/Global_Objects/encodeURIComponent ?
header('Content-Disposition: '.$disposition.';filename*="UTF-8\'\''.utf8_encode($name).'"');
} else {
// Note: There is possibly a bug in Google Chrome: https://stackoverflow.com/questions/61866508/chrome-ignores-content-disposition-filename
header('Content-Disposition: '.$disposition.';filename="'.$name.'"');
}
 
header('Content-Transfer-Encoding: binary');
header('Accept-Ranges: bytes');
header('Cache-Control: public');
 
if (isset($_SERVER['HTTP_RANGE'])) {
list($a, $range) = explode("=",$_SERVER['HTTP_RANGE'],2);
list($range) = explode(",",$range,2);
list($range, $range_end) = explode("-", $range);
$range=intval($range);
if(!$range_end) {
$range_end=$size-1;
} else {
$range_end=intval($range_end);
}
 
$new_length = $range_end-$range+1;
header("HTTP/1.1 206 Partial Content");
header("Content-Length: $new_length");
header("Content-Range: bytes $range-$range_end/$size");
} else {
$range = 0;
$etag = md5_file($file);
header("Etag: $etag");
if (isset($_SERVER['HTTP_IF_NONE_MATCH']) && (trim($_SERVER['HTTP_IF_NONE_MATCH']) == $etag)) {
header("HTTP/1.1 304 Not Modified");
return true;
}
 
$new_length=$size;
header("Content-Length: ".$size);
header('Content-MD5: '.$etag); // RFC 2616 clause 14.15
}
 
set_time_limit(0);
 
$chunksize = 1*(1024*1024);
$bytes_send = 0;
if ($file = fopen($file, 'r')) {
if(isset($_SERVER['HTTP_RANGE']))
fseek($file, $range);
 
while(!feof($file) &&
(!connection_aborted()) && // connection_status() == 0
($bytes_send<$new_length))
{
$buffer = fread($file, $chunksize);
echo($buffer);
flush();
$bytes_send += strlen($buffer);
}
fclose($file);
} else {
throw new Exception("Cannot open file $file");
}
return((connection_status() == 0) and !connection_aborted());
}
 
}