使用php下载存储在Amazon S3上的文件

Question

I have the following code which successfully displays a file saved on S3 to the browser, but I would like to be able to download the file to the client's computer.

What do I need to do?

$result = S3::getObject($Bucketname,$uri);
header("Content-Type: ".$result->headers['type']);
die($result->body);

I've tried the following, but it just downloads an unreadable file...

$result = S3::getObject($Bucketname,$uri);
header('Content-Description: File Transfer');
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename=test.pdf');
header('Content-Transfer-Encoding: binary');
header('Expires: 0');
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header('Pragma: public');
header('Content-Length: ' . strlen($result->body));
ob_clean();
flush();
readfile($result->body);
exit;

Answer 1

you can create a download url, using the getObjectUrl method

somthing like:

$downloadUrl = $s3->getObjectUrl($bucketname, $file, '+5 minutes', array(
                'ResponseContentDisposition' => 'attachment; filename=$file,'Content-Type' => 'application/octet-stream',
        ));

and pass that url to the user. that will direct the user to an amzon page which will start the file download (the link will be valid for 5 minutes - but you can change that)

another option, is first saving that file to your server, and then let the user download the file from your server

Answer 2

You're trying to download a pdf as a binary content type data.

Use the response of your getObject request to get the proper mime type:

$result = S3::getObject($Bucketname,$uri);
header('Content-Description: File Transfer');
header('Content-Type: ' . $result['ContentType']);
header('Content-Disposition: attachment; filename=test.pdf');
header('Content-Transfer-Encoding: binary');
header('Expires: 0');
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header('Pragma: public');
header('Content-Length: ' . strlen($result->body));
ob_clean();
flush();
readfile($result->body);
exit;