WebSVN – php_utils – Blame – /trunk/VtsBrowserDownload.class.php

Rev	Author	Line No.	Line
7	daniel-mar	1	<?php
		2
		3	/*
		4	* VtsBrowserDownload.class.php
		5	* Copyright 2021 Daniel Marschall, ViaThinkSoft
		6	* Revision: 2021-05-21
		7	*
		8	* Licensed under the Apache License, Version 2.0 (the "License");
		9	* you may not use this file except in compliance with the License.
		10	* You may obtain a copy of the License at
		11	*
		12	* http://www.apache.org/licenses/LICENSE-2.0
		13	*
		14	* Unless required by applicable law or agreed to in writing, software
		15	* distributed under the License is distributed on an "AS IS" BASIS,
		16	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
		17	* See the License for the specific language governing permissions and
		18	* limitations under the License.
		19	*/
		20
		21	class VtsBrowserDownload {
		22
		23	private static function wellKnownInlineFile($file_extension) {
		24	// Windows Firefox: Browser decided wheater to display or download by looking at the mime type (inline disposition with explicit filename works)
		25	// Windows Chrome: Browser decided wheater to display or download by looking at the mime type (inline disposition with explicit filename DOES NOT WORK)
		26
		27	//$file_extension = strtolower($file_extension);
		28	//$array_listen = array('txt', 'mp3', 'wav', 'mid', 'ogg', 'pdf', 'avi', 'mov', 'mp4', 'mpeg', 'mpg', 'swf', 'gif', 'jpg', 'jpeg', 'png');
		29	//return in_array($file_extension, $array_listen);
		30
		31	return true;
		32	}
		33
		34	private static function getMimeType($file_extension) {
		35	$file_extension = strtolower($file_extension);
24	daniel-mar	36	if (!class_exists('VtsFileTypeDetect')) {
		37	// https://github.com/danielmarschall/fileformats
		38	throw new Exception("Require 'fileformats' package");
		39	}
7	daniel-mar	40	return VtsFileTypeDetect::getMimeType('dummy.'.$file_extension);
		41	}
		42
		43	public static function output_file($file, $mime_type='', $inline_mode=2/2=auto/) {
		44	// Partitally taken from:
		45	// - https://stackoverflow.com/a/13821992/488539
		46	// - https://stackoverflow.com/a/32885706/488539
		47
		48	if (connection_status() != 0) return false;
		49
		50	$file_extension = pathinfo($file, PATHINFO_EXTENSION);
		51
		52	if(!is_readable($file)) throw new Exception('File not found or inaccessible!');
		53	$size = filesize($file);
		54	$name = rawurldecode(basename($file));
		55
		56	if ($mime_type == '') {
		57	$mime_type = self::getMimeType($file_extension);
		58	if (!$mime_type) $mime_type='application/force-download';
		59	}
		60
		61
		62
		63	while (ob_get_level() > 0) @ob_end_clean();
		64
		65	switch ($inline_mode) {
		66
		67	case 0:
		68	$disposition = 'attachment';
		69	break;
		70
		71	case 1:
		72	$disposition = 'inline';
		73	break;
		74
		75	case 2:
		76	$disposition = self::wellKnownInlineFile($file_extension) ? 'inline' : 'attachment';
		77	break;
		78
		79	default:
		80	throw new Exception('Invalid value for inline_mode');
		81	}
		82
		83	if(ini_get('zlib.output_compression')){
		84	ini_set('zlib.output_compression', 'Off');
		85	}
		86	header('Content-Type: ' . $mime_type);
		87
		88	$ua = isset($_SERVER['HTTP_USER_AGENT']) ? strtoupper($_SERVER['HTTP_USER_AGENT']) : '';
		89	if (strstr($ua, 'MSIE')) {
		90	$name_msie = preg_replace('/\./', '%2e', $name, substr_count($name, '.') - 1);
		91	header('Content-Disposition: '.$disposition.';filename="'.$name_msie.'"');
		92	} else if (strstr($ua, 'FIREFOX')) {
		93	// TODO: Implement "encodeRFC5987ValueChars" described at https://developer.mozilla.org/de/docs/Web/JavaScript/Reference/Global_Objects/encodeURIComponent ?
52	daniel-mar	94	$name_utf8 = mb_convert_encoding($name, 'UTF-8');
		95	header('Content-Disposition: '.$disposition.';filename*="UTF-8\'\''.$name_utf8.'"');
7	daniel-mar	96	} else {
		97	// Note: There is possibly a bug in Google Chrome: https://stackoverflow.com/questions/61866508/chrome-ignores-content-disposition-filename
		98	header('Content-Disposition: '.$disposition.';filename="'.$name.'"');
		99	}
		100
		101	header('Content-Transfer-Encoding: binary');
		102	header('Accept-Ranges: bytes');
		103	header('Cache-Control: public');
		104
		105	if (isset($_SERVER['HTTP_RANGE'])) {
		106	list($a, $range) = explode("=",$_SERVER['HTTP_RANGE'],2);
		107	list($range) = explode(",",$range,2);
		108	list($range, $range_end) = explode("-", $range);
		109	$range=intval($range);
		110	if(!$range_end) {
		111	$range_end=$size-1;
		112	} else {
		113	$range_end=intval($range_end);
		114	}
		115
		116	$new_length = $range_end-$range+1;
32	daniel-mar	117	http_response_code(206); // 206 Partial Content
7	daniel-mar	118	header("Content-Length: $new_length");
		119	header("Content-Range: bytes $range-$range_end/$size");
		120	} else {
		121	$range = 0;
		122	$etag = md5_file($file);
		123	header("Etag: $etag");
		124	if (isset($_SERVER['HTTP_IF_NONE_MATCH']) && (trim($_SERVER['HTTP_IF_NONE_MATCH']) == $etag)) {
32	daniel-mar	125	http_response_code(304); // 304 Not Modified
7	daniel-mar	126	return true;
		127	}
		128
		129	$new_length=$size;
		130	header("Content-Length: ".$size);
		131	header('Content-MD5: '.$etag); // RFC 2616 clause 14.15
		132	}
		133
		134	set_time_limit(0);
		135
		136	$chunksize = 1(10241024);
		137	$bytes_send = 0;
		138	if ($file = fopen($file, 'r')) {
		139	if(isset($_SERVER['HTTP_RANGE']))
		140	fseek($file, $range);
		141
		142	while(!feof($file) &&
		143	(!connection_aborted()) && // connection_status() == 0
		144	($bytes_send<$new_length))
		145	{
		146	$buffer = fread($file, $chunksize);
		147	echo($buffer);
		148	flush();
		149	$bytes_send += strlen($buffer);
		150	}
		151	fclose($file);
		152	} else {
		153	throw new Exception("Cannot open file $file");
		154	}
		155	return((connection_status() == 0) and !connection_aborted());
		156	}
		157
		158	}

Subversion Repositories php_utils

php_utils/trunk/VtsBrowserDownload.class.php – Rev 52