89 lines
3.3 KiB
PHP
89 lines
3.3 KiB
PHP
<?php
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/**
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* Class Application_Common_FileIO contains helper functions for reading and writing files, and sending them over HTTP.
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*/
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class Application_Common_FileIO
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{
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/**
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* Reads the requested portion of a file and sends its contents to the client with the appropriate headers.
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*
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* This HTTP_RANGE compatible read file function is necessary for allowing streaming media to be skipped around in.
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*
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* @param string $filePath - the full filepath or URL pointing to the location of the file
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* @param string $mimeType - the file's mime type. Defaults to 'audio/mp3'
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* @param int $size - the file size, in bytes
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*
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* @see https://groups.google.com/d/msg/jplayer/nSM2UmnSKKA/Hu76jDZS4xcJ
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* @see https://php.net/manual/en/function.readfile.php#86244
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*/
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public static function smartReadFile($filePath, $size, $mimeType)
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{
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$fm = @fopen($filePath, 'rb');
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if (!$fm) {
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throw new LibreTimeFileNotFoundException($filePath);
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}
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// Note that $size is allowed to be zero. If that's the case, it means we don't
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// know the filesize, and we need to figure one out so modern browsers don't get
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// confused. This should only affect files imported by legacy upstream since
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// media monitor did not always set the proper size in the database but analyzer
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// seems to always have a value for this.
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if ($size === 0) {
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$fstats = fstat($fm);
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$size = $fstats['size'];
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}
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if ($size <= 0) {
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throw new Exception("Invalid file size returned for file at {$filePath}");
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}
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$begin = 0;
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$end = $size - 1;
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ob_start(); // Must start a buffer here for these header() functions
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if (isset($_SERVER['HTTP_RANGE'])) {
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if (preg_match('/bytes=\h*(\d+)-(\d*)[\D.*]?/i', $_SERVER['HTTP_RANGE'], $matches)) {
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$begin = intval($matches[1]);
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if (!empty($matches[2])) {
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$end = intval($matches[2]);
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}
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}
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}
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if (isset($_SERVER['HTTP_RANGE'])) {
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header('HTTP/1.1 206 Partial Content');
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} else {
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header('HTTP/1.1 200 OK');
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}
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header("Content-Type: {$mimeType}");
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header('Content-Transfer-Encoding: binary');
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header('Cache-Control: public, must-revalidate, max-age=0');
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header('Pragma: no-cache');
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header('Accept-Ranges: bytes');
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header('Content-Length:' . (($end - $begin) + 1));
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if (isset($_SERVER['HTTP_RANGE'])) {
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header("Content-Range: bytes {$begin}-{$end}/{$size}");
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}
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// We can have multiple levels of output buffering. Need to
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// keep looping until all have been disabled!!!
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// https://www.php.net/manual/en/function.ob-end-flush.php
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while (ob_get_level() > 0) {
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ob_end_flush();
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}
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// These two lines were removed from Airtime 2.5.x at some point after Libretime forked from Airtime.
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// These lines allow seek to work for files.
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// Issue #349
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$cur = $begin;
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fseek($fm, $begin, 0);
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while (!feof($fm) && (connection_status() == 0) && ($cur <= $end)) {
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echo fread($fm, 1024 * 8);
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}
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fclose($fm);
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}
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}
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