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Implement 304 Not Modified and 206 Partial Content for file downloads

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This commit is contained in:
Kijin Sung 2015-07-14 16:38:35 +09:00
parent 48f65c7560
commit bd922c8aae
1 changed files with 60 additions and 17 deletions
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77
modules/file/file.controller.php
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@ -293,8 +293,30 @@ class fileController extends file
$columnList = array('source_filename', 'uploaded_filename', 'file_size');
$file_obj = $oFileModel->getFile($file_srl, $columnList);
$file_size = $file_obj->file_size;
$filesize = $file_obj->file_size;
$filename = $file_obj->source_filename;
$etag = md5($file_srl . $file_key . $_SERVER['HTTP_USER_AGENT']);
// Check if file exists
$uploaded_filename = $file_obj->uploaded_filename;
if(!file_exists($uploaded_filename))
{
return $this->stop('msg_file_not_found');
}
// If client sent an If-None-Match header with the correct ETag, do not download again
if(isset($_SERVER['HTTP_IF_NONE_MATCH']) && trim(trim($_SERVER['HTTP_IF_NONE_MATCH']), '\'"') === $etag)
{
header('HTTP/1.1 304 Not Modified');
exit();
}
// If client sent an If-Modified-Since header with a recent modification date, do not download again
if(isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) && strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']) > filemtime($uploaded_filename))
{
header('HTTP/1.1 304 Not Modified');
exit();
}
// Android <= 4.0 tries to download the same file twice, so we allow it
if(strstr($_SERVER['HTTP_USER_AGENT'], "Android"))
@ -334,35 +356,56 @@ class fileController extends file
// Close context to prevent blocking the session
Context::close();
// Check if file exists
$uploaded_filename = $file_obj->uploaded_filename;
if(!file_exists($uploaded_filename))
// Open file
$fp = fopen($uploaded_filename, 'rb');
if(!$fp)
{
return $this->stop('msg_file_not_found');
}
$fp = fopen($uploaded_filename, 'rb');
if(!$fp) return $this->stop('msg_file_not_found');
// Take care of pause and resume
if(isset($_SERVER['HTTP_RANGE']) && preg_match('/^bytes=(\d+)-(\d+)?/', $_SERVER['HTTP_RANGE'], $matches))
{
$range_start = $matches[1];
$range_end = $matches[2] ? $matches[2] : ($filesize - 1);
$range_length = $range_end - $range_start + 1;
if($range_length < 1 || $range_start < 0 || $range_start >= $filesize || $range_end >= $filesize)
{
header('HTTP/1.1 416 Requested Range Not Satisfiable');
fclose($fp);
exit();
}
fseek($fp, $range_start);
header('HTTP/1.1 206 Partial Content');
header('Content-Range: bytes ' . $range_start . '-' . $range_end . '/' . $filesize);
}
else
{
$range_start = 0;
$range_length = $filesize - $range_start;
}
// Clear buffer
while(ob_get_level()) ob_end_clean();
// Set headers
header("Cache-Control: ");
header("Cache-Control: private; max-age=3600");
header("Pragma: ");
header("Content-Type: application/octet-stream");
header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
header("Content-Length: " .(string)($file_size));
header('Content-Disposition: attachment; filename="'.$filename.'"');
header("Content-Transfer-Encoding: binary\n");
header('Content-Transfer-Encoding: binary');
header('Content-Length: ' . $range_length);
header('Accept-Ranges: bytes');
header('Etag: "' . $etag . '"');
// If file size is lager than 1MB, use fread function (#18675748)
if(filesize($uploaded_filename) > 1024 * 1024)
// Print the file contents
for($offset = 0; $offset < $range_length; $offset += 4096)
{
while(!feof($fp)) echo fread($fp, 1024);
fclose($fp);
}
else
{
fpassthru($fp);
$buffer_size = min(4096, $range_length - $offset);
echo fread($fp, $buffer_size);
flush();
}
exit();