downloader/VinylDownload.class.php

<?php
class VinylDownload {

	const MAXDOWNLOADS =  3;
	const TABLE = 'vinyl-codes';
	public $database, $file, $code;

	public function __construct() {
//		@set_time_limit(0);
//		ini_set('memory_limit', '512M');
	}

	private function db_connect(){
		$db = new SQLite3( $this->database );
		if (!$db) die ($error);
		return $db;
	}

	public function query_code($code) {
		$db = $this->db_connect();

		$c = SQLite3::escapeString ( $code ) ;
		$q = "SELECT * FROM '" .  self::TABLE . "' WHERE code='" . $c . "'" ;

		$result = @$db->query( $q );
		$row = @$result->fetchArray();

		$db->close();

		// row == false when no row was found
		return $row;
	}


	private function increase_count_in_db() {
		$db = @$this->db_connect();
		$db->exec( "UPDATE '" .  self::TABLE . "' SET count = count + 1 WHERE code='" . $this->code . "'" );
		$db->close();
	}

	public function reached_max_dl( $count ) {
		$max = false;
		$count += 1;

		if ( $count > self::MAXDOWNLOADS ) $max = true;

		return $max;
	}


	public function gen_response( $c , $f ){

		$this->code = $c;
		$content = "Code ungültig oder abgelaufen.";

		// row == false when no row was found
		if ( $row = $this->query_code($this->code) ) {
			// max count not reached
			if ( false === $this->reached_max_dl( $row['count'] ) ) {
				$content ='

				<div id="1">
					<form method=POST id="dl-trigger" action="https://www.rainervonvielen.de/digital-download"><p>
						<input type="hidden" value="'. $this->code . '" name="c">
						<input type="hidden" value="'. $f . '" name="sel_format">
						<input type="submit" class ="btn middle" value="Start">
					</form>
				</div>
				<script>
						jQuery("#dl-trigger").submit(function(e) {
                                                  jQuery("#1").html( "<p><strong>Download ist gestartet.</strong> Du hast noch <strong>' .  ( self::MAXDOWNLOADS - $row['count'] - 1 ) .'</strong> Downloads zur Verf&uuml;gung bis der Code ung&uuml;ltig wird." );
						});
                                                  return true;
				</script>

				';
			}
		}

		return $content;
	}


	public function dl_trigger($format) {
		// Start Download
		switch ($format) {
			case 'mp3':
				$file = $this->mp3_file;
                                $filename = "Rainer_von_Vielen-Überall_Chaos_2017-MP3.zip";
				break;
			case 'wav':
				$file = $this->wav_file;
                                $filename = "Rainer_von_Vielen-Überall_Chaos_2017-WAV.zip";
				break;
		}

		$this->downloader( $file, $filename );
		$this->increase_count_in_db();
        }


	private function downloader( $file, $filename ){
		// Force the browser to start the download automatically

		//  Variables:
		//  $file = real name of actual download file on the server
		//  $filename = new name of local download file - this is what the visitor's file will actually be called when he/she saves it

		ob_start();

		header("Content-Type: application/octet-stream");
		header("Content-Disposition: attachment; filename=".$filename."");
		header("Content-Description: File Transfer");
		header("Content-Length: " .(string)(filesize($file)) );
		header("Cache-Control: public, must-revalidate");
		header("Pragma: public");
		header("Content-Transfer-Encoding: binary\n");

		ob_end_clean();
		readfile($file);
	}


/*
* Nicht benoetigt::
*/

	private function downloader_large_file( $filePath )
	{
		if(!empty($filePath)){

			$fileInfo = pathinfo($filePath);
			$fileName  = $fileInfo['basename'];
			$fileExtnesion   = $fileInfo['extension'];
			$default_contentType = "application/octet-stream";
			$content_types_list = $this->mimeTypes();

			// to find and use specific content type, check out this IANA page : http://www.iana.org/assignments/media-types/media-types.xhtml

			if (array_key_exists($fileExtnesion, $content_types_list)) {
				$contentType = $content_types_list[$fileExtnesion];
			} else {
				$contentType =  $default_contentType;
			}

			if (file_exists($filePath)) {
				$size = filesize($filePath);
				$offset = 0;
				$length = $size;
				//HEADERS FOR PARTIAL DOWNLOAD FACILITY BEGINS

				if ( isset( $_SERVER['HTTP_RANGE'] ) ) {
					preg_match('/bytes=(\d+)-(\d+)?/', $_SERVER['HTTP_RANGE'], $matches);
					$offset = intval($matches[1]);
					$length = intval($matches[2]) - $offset;
					$fhandle = fopen($filePath, 'r');
					fseek($fhandle, $offset); // seek to the requested offset, this is 0 if it's not a partial content request
					$data = fread($fhandle, $length);
					fclose($fhandle);
					header('HTTP/1.1 206 Partial Content');
					header('Content-Range: bytes ' . $offset . '-' . ($offset + $length) . '/' . $size);
				}//HEADERS FOR PARTIAL DOWNLOAD FACILITY BEGINS

				//USUAL HEADERS FOR DOWNLOAD
				header("Content-Disposition: attachment;filename=".$fileName);
				header('Content-Type: '.$contentType);
				header("Accept-Ranges: bytes");
				header("Pragma: public");
				header("Expires: -1");
				header("Cache-Control: no-cache");
				header("Cache-Control: public, must-revalidate, post-check=0, pre-check=0");
				header("Content-Length: ".filesize($filePath));

				$chunksize = 8 * (1024 * 1024); //8MB (highest possible fread length)

				if ($size > $chunksize){
					$handle = fopen($_FILES["file"]["tmp_name"], 'rb');
					$buffer = '';
					while (!feof($handle) && (connection_status() === CONNECTION_NORMAL))
					{
						$buffer = fread($handle, $chunksize);
						print $buffer;
						ob_flush();
						flush();
					}
					if(connection_status() !== CONNECTION_NORMAL){
						echo "Connection aborted";
					}
					fclose($handle);

				}	else {
					ob_clean();
					flush();
					readfile($filePath);
				}

			} else {
			   echo 'File does not exist!';
			 }

		}	else {
			echo 'There is no file to download!';
		}
	}


	/* Function to get correct MIME type for download */
	private function mimeTypes( $defaultType = null )
	{
		/* Just add any required MIME type if you are going to download something not listed here.*/
		$mime_types = array("323" => "text/h323",
			"acx" => "application/internet-property-stream",
			"ai" => "application/postscript",
			"aif" => "audio/x-aiff",
			"aifc" => "audio/x-aiff",
			"aiff" => "audio/x-aiff",
			"asf" => "video/x-ms-asf",
			"asr" => "video/x-ms-asf",
			"asx" => "video/x-ms-asf",
			"au" => "audio/basic",
			"avi" => "video/x-msvideo",
			"axs" => "application/olescript",
			"bas" => "text/plain",
			"bcpio" => "application/x-bcpio",
			"bin" => "application/octet-stream",
			"bmp" => "image/bmp",
			"c" => "text/plain",
			"cat" => "application/vnd.ms-pkiseccat",
			"cdf" => "application/x-cdf",
			"cer" => "application/x-x509-ca-cert",
			"class" => "application/octet-stream",
			"clp" => "application/x-msclip",
			"cmx" => "image/x-cmx",
			"cod" => "image/cis-cod",
			"cpio" => "application/x-cpio",
			"crd" => "application/x-mscardfile",
			"crl" => "application/pkix-crl",
			"crt" => "application/x-x509-ca-cert",
			"csh" => "application/x-csh",
			"css" => "text/css",
			"dcr" => "application/x-director",
			"der" => "application/x-x509-ca-cert",
			"dir" => "application/x-director",
			"dll" => "application/x-msdownload",
			"dms" => "application/octet-stream",
			"doc" => "application/msword",
			"dot" => "application/msword",
			"dvi" => "application/x-dvi",
			"dxr" => "application/x-director",
			"eps" => "application/postscript",
			"etx" => "text/x-setext",
			"evy" => "application/envoy",
			"exe" => "application/octet-stream",
			"fif" => "application/fractals",
			"flr" => "x-world/x-vrml",
			"gif" => "image/gif",
			"gtar" => "application/x-gtar",
			"gz" => "application/x-gzip",
			"h" => "text/plain",
			"hdf" => "application/x-hdf",
			"hlp" => "application/winhlp",
			"hqx" => "application/mac-binhex40",
			"hta" => "application/hta",
			"htc" => "text/x-component",
			"htm" => "text/html",
			"html" => "text/html",
			"htt" => "text/webviewhtml",
			"ico" => "image/x-icon",
			"ief" => "image/ief",
			"iii" => "application/x-iphone",
			"ins" => "application/x-internet-signup",
			"isp" => "application/x-internet-signup",
			"jfif" => "image/pipeg",
			"jpe" => "image/jpeg",
			"jpeg" => "image/jpeg",
			"jpg" => "image/jpeg",
			"js" => "application/x-javascript",
			"latex" => "application/x-latex",
			"lha" => "application/octet-stream",
			"lsf" => "video/x-la-asf",
			"lsx" => "video/x-la-asf",
			"lzh" => "application/octet-stream",
			"m13" => "application/x-msmediaview",
			"m14" => "application/x-msmediaview",
			"m3u" => "audio/x-mpegurl",
			"man" => "application/x-troff-man",
			"mdb" => "application/x-msaccess",
			"me" => "application/x-troff-me",
			"mht" => "message/rfc822",
			"mhtml" => "message/rfc822",
			"mid" => "audio/mid",
			"mny" => "application/x-msmoney",
			"mov" => "video/quicktime",
			"movie" => "video/x-sgi-movie",
			"mp2" => "video/mpeg",
			"mp3" => "audio/mpeg",
			"mpa" => "video/mpeg",
			"mpe" => "video/mpeg",
			"mpeg" => "video/mpeg",
			"mpg" => "video/mpeg",
			"mpp" => "application/vnd.ms-project",
			"mpv2" => "video/mpeg",
			"ms" => "application/x-troff-ms",
			"mvb" => "application/x-msmediaview",
			"nws" => "message/rfc822",
			"oda" => "application/oda",
			"p10" => "application/pkcs10",
			"p12" => "application/x-pkcs12",
			"p7b" => "application/x-pkcs7-certificates",
			"p7c" => "application/x-pkcs7-mime",
			"p7m" => "application/x-pkcs7-mime",
			"p7r" => "application/x-pkcs7-certreqresp",
			"p7s" => "application/x-pkcs7-signature",
			"pbm" => "image/x-portable-bitmap",
			"pdf" => "application/pdf",
			"pfx" => "application/x-pkcs12",
			"pgm" => "image/x-portable-graymap",
			"pko" => "application/ynd.ms-pkipko",
			"pma" => "application/x-perfmon",
			"pmc" => "application/x-perfmon",
			"pml" => "application/x-perfmon",
			"pmr" => "application/x-perfmon",
			"pmw" => "application/x-perfmon",
			"pnm" => "image/x-portable-anymap",
			"pot" => "application/vnd.ms-powerpoint",
			"ppm" => "image/x-portable-pixmap",
			"pps" => "application/vnd.ms-powerpoint",
			"ppt" => "application/vnd.ms-powerpoint",
			"prf" => "application/pics-rules",
			"ps" => "application/postscript",
			"pub" => "application/x-mspublisher",
			"qt" => "video/quicktime",
			"ra" => "audio/x-pn-realaudio",
			"ram" => "audio/x-pn-realaudio",
			"ras" => "image/x-cmu-raster",
			"rgb" => "image/x-rgb",
			"rmi" => "audio/mid",
			"roff" => "application/x-troff",
			"rtf" => "application/rtf",
			"rtx" => "text/richtext",
			"scd" => "application/x-msschedule",
			"sct" => "text/scriptlet",
			"setpay" => "application/set-payment-initiation",
			"setreg" => "application/set-registration-initiation",
			"sh" => "application/x-sh",
			"shar" => "application/x-shar",
			"sit" => "application/x-stuffit",
			"snd" => "audio/basic",
			"spc" => "application/x-pkcs7-certificates",
			"spl" => "application/futuresplash",
			"src" => "application/x-wais-source",
			"sst" => "application/vnd.ms-pkicertstore",
			"stl" => "application/vnd.ms-pkistl",
			"stm" => "text/html",
			"svg" => "image/svg+xml",
			"sv4cpio" => "application/x-sv4cpio",
			"sv4crc" => "application/x-sv4crc",
			"t" => "application/x-troff",
			"tar" => "application/x-tar",
			"tcl" => "application/x-tcl",
			"tex" => "application/x-tex",
			"texi" => "application/x-texinfo",
			"texinfo" => "application/x-texinfo",
			"tgz" => "application/x-compressed",
			"tif" => "image/tiff",
			"tiff" => "image/tiff",
			"tr" => "application/x-troff",
			"trm" => "application/x-msterminal",
			"tsv" => "text/tab-separated-values",
			"txt" => "text/plain",
			"uls" => "text/iuls",
			"ustar" => "application/x-ustar",
			"vcf" => "text/x-vcard",
			"vrml" => "x-world/x-vrml",
			"wav" => "audio/x-wav",
			"wcm" => "application/vnd.ms-works",
			"wdb" => "application/vnd.ms-works",
			"wks" => "application/vnd.ms-works",
			"wmf" => "application/x-msmetafile",
			"wps" => "application/vnd.ms-works",
			"wri" => "application/x-mswrite",
			"wrl" => "x-world/x-vrml",
			"wrz" => "x-world/x-vrml",
			"xaf" => "x-world/x-vrml",
			"xbm" => "image/x-xbitmap",
			"xla" => "application/vnd.ms-excel",
			"xlc" => "application/vnd.ms-excel",
			"xlm" => "application/vnd.ms-excel",
			"xls" => "application/vnd.ms-excel",
			"xlt" => "application/vnd.ms-excel",
			"xlw" => "application/vnd.ms-excel",
			"xof" => "x-world/x-vrml",
			"xpm" => "image/x-xpixmap",
			"xwd" => "image/x-xwindowdump",
			"z" => "application/x-compress",
			"rar" => "application/x-rar-compressed",
			"zip" => "application/zip");
		return $mime_types;
	}
}


?>