Stream file from S3 to browser, assume Laravel Filesystem usage

stream_file.php

<?php


/*************************************************************************
 * Get File Information
 */

// Assuming these come from some data source in your app
$s3FileKey = 's3/key/path/to/file.ext';
$fileName = 'file.ext';

// Create temporary download link and redirect
$adapter = Storage::disk('s3')->getAdapter();
$client = $adapter->getClient();
$client->registerStreamWrapper();

$object = $client->headObject([
    'Bucket' => $adapter->getBucket(),
    'Key' => /*$adapter->getPathPrefix() . */$s3FileKey,
]);




/*************************************************************************
 * Set headers to allow browser to force a download
 */
header('Last-Modified: '.$object['LastModified']);
// header('Etag: '.$object['ETag']); # We are not implementing validation caching here, but we could!
header('Accept-Ranges: '.$object['AcceptRanges']);
header('Content-Length: '.$object['ContentLength']);
header('Content-Type: '.$object['ContentType']);
header('Content-Disposition: attachment; filename='.$fileName);




/*************************************************************************
 * Stream file to the browser
 */

// Open a stream in read-only mode
if (!($stream = fopen("s3://{$adapter->getBucket()}/{$s3FileKey}", 'r'))) {
    throw new \Exception('Could not open stream for reading file: ['.$s3FileKey.']');
}

// Check if the stream has more data to read
while (!feof($stream)) {
    // Read 1024 bytes from the stream
    echo fread($stream, 1024);
}
// Be sure to close the stream resource when you're done with it
fclose($stream);

Reference:

Docs on HeadObject S3 API call:

http://docs.aws.amazon.com/aws-sdk-php/v3/api/api-s3-2006-03-01.html#headobject

Example streaming file and explanation on "$client->registerStreamWrapper()" method:

https://aws.amazon.com/blogs/developer/amazon-s3-php-stream-wrapper/

Force file download via Content-Disposition header:

https://stackoverflow.com/questions/8485886/force-file-download-with-php-using-header

Hey @fideloper, I bought your Scaling Laravel course and slowly but surely implementing all that good stuff into my app! I've just implemented your S3FileStream class, but not 100% sure how to test (or specially how to mock S3). Can you share any ideas your have re: testing against that class?

hey @fideloper . There's an extra paranthesis at the end of

header('Content-Disposition: attachment; filename='.$fileName));

causing a syntax error

Fideloper Update: Fixed that, thanks!

@fideloper thanks so much, saved me hours.

@fideloper thanks for this