Uploading file to S3 using presigned URL in PHP - php

Question

I am developing a Web Application using PHP. In my application, I need to upload the file to the AWS S3 bucket using Presigned URL. Now, I can read the private file from the S3 bucket using pre-signed like this.
$s3Client = new S3Client([
'version' => 'latest',
'region' => env('AWS_REGION', ''),
'credentials' => [
'key' => env('AWS_IAM_KEY', ''),
'secret' => env('AWS_IAM_SECRET', '')
]
]);
//GetObject
$cmd = $s3Client->getCommand('GetObject', [
'Bucket' => env('AWS_BUCKET',''),
'Key' => 'this-is-uploaded-using-presigned-url.png'
]);
$request = $s3Client->createPresignedRequest($cmd, '+20 minutes');
//This is for reading the image. It is working.
$presignedUrl = (string) $request->getUri();
When I access the $presignedUrl from the browser, I can get the file from the s3. It is working. But now, I am uploading a file to S3. Not reading the file from s3. Normally, I can upload the file to the S3 like this.
$client->putObject(array(
'Bucket' => $bucket,
'Key' => 'data.txt',
'Body' => 'Hello!'
));
The above code is not using the pre-signed URL. But I need to upload the file using a pre-signed URL. How, can I upload the file using a pre-signed URL. For example, what I am thinking is something like this.
$client->putObject(array(
'presigned-url' => 'url'
'Bucket' => $bucket,
'Key' => 'data.txt',
'Body' => 'Hello!'
));
How can I upload?

Answer 1

It seems reasonable that you can create a pre-signed PutPobject command by running:
$cmd = $s3Client->getCommand('PutObject', [
'Bucket' => $bucket,
'Key' => $key
]);
$request = $s3Client->createPresignedRequest($cmd, '+20 minutes')->withMethod('PUT');
Then you might want to perform the PUT call from PHP using:
file_put_contents(
$request->getUri(),
'Hello!',
stream_context_create(['http' => [ 'method' => 'PUT' ]])
);
If you want to create a URL that a browser can submit, then you need to have the browser send the file as a form POST. This AWS documentation explains how to create a pre-signed POST request with the fields that you then need to put into an HTML form and display to the user: https://docs.aws.amazon.com/sdk-for-php/v3/developer-guide/s3-presigned-post.html
Also, this answer might be useful: https://stackoverflow.com/a/59644117/53538