AWS S3 Presigned Request Cache
I want to store user profile pictures in an S3 bucket, but keep these images private. In order to do this, I am creating a presigned url whenever the image is required. However, this creates a unique url each time which means the image will never be cached by the browser and I'll end up paying a lot more in GET requests.
Here's an example of my code to generate the url, I'm using Laravel:
$s3 = Storage::disk('s3');
$client = $s3->getDriver()->getAdapter()->getClient();
$expiry = new DateTime('2017-07-25');
$command = $client->getCommand('GetObject', [
'Bucket' => Config::get('filesystems.disks.s3.bucket'),
'Key' => $key
]);
$request = $client->createPresignedRequest($command, $expiry);
return (string) $request->getUri();
I thought that by specifying a datetime rather a unit of time that it would create the same url but it actually adds the number of seconds remaining to the url, here's an example:
xxxx.s3.eu-west-2.amazonaws.com/profile-pics/92323.png?X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AXXXXXXXXXXX%2Feu-west-2%2Fs3%2Faws4_request&X-Amz-Date=20170720T112123Z&X-Amz-SignedHeaders=host&X-Amz-Expires=391117&X-Amz-Signature=XXXXXXXXX
Is it possible to generate a repeatable presigned request url so that an image may be cached by the users browser?
Rather than using the presigned URL mechanism perhaps you could add an authenticated endpoint to your application and within said endpoint retrieve the image? Using this URL in your img tags and such. This endpoint could cache the image and provide the appropriate response headers for the browser to cache the image too.
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