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<?php namespace FileRun\Utils; use \S; class Downloads { static $downloadMethod = 'regular'; static $bytesSentToBrowser = 0; private static function sendWithXAccel($path) { global $config; if (stristr($_SERVER["SERVER_SOFTWARE"], 'nginx') === false) {return false;} if (!is_array($config['x_accel_paths'])) { header("X-Accel-Redirect: ".$path); return true; } foreach($config['x_accel_paths'] as $folder) { if (\FM::inPath($path, $folder)) { header("X-Accel-Redirect: ".$path); return true; } } return false; } private static function sendWithXSendfile($path) { if (stristr($_SERVER["SERVER_SOFTWARE"], 'apache') === false) {return false;} if (\FM::getOS() == 'win') { //on Windows OS, the filenames are stored as ISO-8859-1 and not UTF-8 $path = S::convert2UTF8($path, "ISO-8859-1"); } header("X-Sendfile: ".$path); return true; } private static function sendWithLightSpeed($path) { global $config; if (stristr($_SERVER["SERVER_SOFTWARE"], 'litespeed') === false) {return false;} if (!$config['x_lightspeed_root']) {return false;} $len = mb_strlen($config['x_lightspeed_root']); $path = mb_substr($path, $len); header("X-LiteSpeed-Location: ".$path); return true; } private static function sendDefault($path, $fileSize) { header("Accept-Ranges: bytes"); if ($_SERVER['REQUEST_METHOD'] == "HEAD") {return false;} $rs = self::outputRangeHeadersAndGetOffset($fileSize); $offset = $rs[0]; $length = $rs[1]; self::outputFile($path, $offset, $length); if ( (self::$bytesSentToBrowser == $fileSize) //100% of the file sent in one request \|\| ($offset > 0 && $offset+$length >= $fileSize && self::$bytesSentToBrowser == $length) //partial request, but includes the bottom of the file ) { return "final"; } return "partial"; } static function isMSIE(): bool {return stripos($_SERVER['HTTP_USER_AGENT'], 'MSIE') !== false;} static function isEdge(): bool {return stripos($_SERVER['HTTP_USER_AGENT'], 'Edge') !== false;} static function encodeFileName($fileName): string { $fileName = \S::convert2UTF8($fileName); return '"'.((self::isMSIE() \|\| self::isEdge()) ? \S::forURL($fileName) : $fileName).'"'; } static function sendHTTPFile($path, $changeFilenameTo = "") { global $settings; if (!file_exists($path)) { header("HTTP/1.1 404 Not Found"); return false; } $filename = $changeFilenameTo ?: \FM::basename($path); header("Content-Type: application/octet-stream; charset=UTF-8"); header('Content-Disposition: attachment; filename='.self::encodeFileName($filename)); if (self::isMSIE()) { header("Cache-Control: cache, must-revalidate"); header("Pragma: public"); } $fileSize = \FM::getFileSize($path); if ($settings->download_accelerator) { $rs = false; if ($settings->download_accelerator == 'x_accel') { $rs = self::sendWithXAccel($path); } else if ($settings->download_accelerator == 'xsendfile') { $rs = self::sendWithXSendfile($path); } else if ($settings->download_accelerator == 'lightspeed') { $rs = self::sendWithLightSpeed($path); } if ($rs) { self::$downloadMethod = $settings->download_accelerator; self::$bytesSentToBrowser = $fileSize; return "unknown"; } } return self::sendDefault($path, $fileSize); } static function sendFileToBrowser($path, $changeFilenameTo = "") { global $settings; if (!file_exists($path)) { header("HTTP/1.1 404 Not Found"); echo "The file was not found"; return false; } $mtime = @filemtime($path); $RFC2616 = false; if ($mtime) { $RFC2616 = gmdate('D, d M Y H:i:s T', $mtime); if(isset($_SERVER['HTTP_IF_MODIFIED_SINCE'])) { if (S::forHTML($_SERVER['HTTP_IF_MODIFIED_SINCE']) == $RFC2616) { header('HTTP/1.0 304 Not Modified', true, 304); self::$bytesSentToBrowser = 0; return "unknown"; } } } if ($RFC2616) { header('Last-Modified: '. $RFC2616); } $filename = \FM::basename($path); $ext = \FM::getExtension($filename); if ($changeFilenameTo) {$filename = $changeFilenameTo;} $mime_type = \FM::mime_type($filename); header('Content-Type: '.$mime_type); if ($mime_type == "application/octet-stream") { $disposition = 'attachment'; } else { $disposition = 'inline'; } header('Content-Disposition: '.$disposition.'; filename='.self::encodeFileName($filename).''); $fileSize = \FM::getFileSize($path); if ($settings->download_accelerator) { $rs = false; if ($settings->download_accelerator == 'x_accel') { $rs = self::sendWithXAccel($path); } else if ($settings->download_accelerator == 'xsendfile') { $rs = self::sendWithXSendfile($path); } else if ($settings->download_accelerator == 'lightspeed') { $rs = self::sendWithLightSpeed($path); } if ($rs) { self::$downloadMethod = $settings->download_accelerator; self::$bytesSentToBrowser = $fileSize; return "unknown"; } } if (self::isMSIE()) { header("Cache-Control: cache, must-revalidate"); header("Pragma: public"); } if ($ext == "pdf" && self::isMSIE()) {//disable range download for MSIE with PDFs header("Accept-Ranges: none"); header("Content-Length: ".$fileSize); $offset = false; $length = false; } else { $rs = self::outputRangeHeadersAndGetOffset($fileSize); $offset = $rs[0]; $length = $rs[1]; } if ($_SERVER['REQUEST_METHOD'] == "HEAD") {return false;} self::outputFile($path, $offset, $length); if ( (self::$bytesSentToBrowser == $fileSize) //100% of the file sent in one request \|\| ($offset > 0 && $offset+$length >= $fileSize && self::$bytesSentToBrowser == $length) //partial request, but includes the bottom of the file ) { return "final"; } return "partial"; } static function outputRangeHeadersAndGetOffset($fileSize) { header('Accept-Ranges: bytes'); $start = 0; $new_length = 0; if (isset($_SERVER['HTTP_RANGE'])) { $r = substr($_SERVER['HTTP_RANGE'], 6); if (strstr($r, ",")) { //multirange requests are not supported header("Content-Length: ".$fileSize); } else { $range = $r; $parts = explode('-', $range); $start = $parts[0]; if (strlen($start) == 0) {$start = 0;} $end = $parts[1]; if (strlen($end) == 0 \|\| $end > $fileSize) { $end = $fileSize-1; } if ($start > $end) { header("HTTP/1.1 416 Requested Range Not Satisfiable"); header("Content-Range: bytes */".$fileSize); // Required in 416. exit(); } if ($end == $start) { $new_length = 1; } else { $new_length = $end-$start; if ($new_length < $fileSize) { $new_length++; } } header("HTTP/1.1 206 Partial Content"); header("Content-Range: bytes ".$start."-".$end."/".$fileSize); header("Content-Length: ".$new_length); } } else { header("Content-Length: ".$fileSize); } return [$start, $new_length]; } static function outputFile($path, $offset = false, $length = false) { self::$bytesSentToBrowser = 0; ignore_user_abort(true); @session_write_close();//avoid hanging @set_time_limit(86400); $context = stream_context_create(); $handle = fopen($path, "rb", false, $context); if (!$handle) {return false;} if ($offset) { fseek($handle, $offset); } $chunkSize = 16384; $count = 0; while (!feof($handle)) { if ($length && $count+$chunkSize > $length) { $chunkSize = $length-$count;//remaining data is smaller than a chunk } $chunk = stream_get_contents($handle, $chunkSize); $thisChunkSize = strlen($chunk); $count = $count+$thisChunkSize; echo $chunk; self::$bytesSentToBrowser += $thisChunkSize; if ($length && $count >= $length) { //we hit out length break; } //flush(); //@ob_flush(); if (connection_aborted()) { return "aborted"; } } fclose($handle); if (connection_aborted()) { return "aborted"; } return true; } static function sendImageToBrowser($src, $maxCacheAge = 3600) { $fileSize = \FM::getFileSize($src); $fileName = \FM::basename($src); $last_modified_time = filemtime($src); $eTag = md5($fileSize.$last_modified_time); $d = new \DateTime($_SERVER['HTTP_IF_MODIFIED_SINCE']); $if_modified_since_unix_timestamp = $d->format("U"); $gmt_last_modified = gmdate("U", $last_modified_time); $requestETag = str_replace('"', '', S::fromHTML($_SERVER['HTTP_IF_NONE_MATCH'])); if ($requestETag == $eTag && $if_modified_since_unix_timestamp == $gmt_last_modified) { header('HTTP/1.1 304 Not Modified'); } header('Etag: "'.$eTag.'"'); header("Cache-Control: private, max-age=".$maxCacheAge); header("Last-Modified: ".gmdate("D, d M Y H:i:s", $last_modified_time)." GMT"); if ($requestETag != $eTag \|\| $if_modified_since_unix_timestamp != $gmt_last_modified) { header('Content-Disposition: inline; filename='.self::encodeFileName($fileName)); header("Content-Type: image/png"); header("Content-Length: ".$fileSize); self::outputFile($src); } } }

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