Browser Based File Upload on AWS S3 using POST Request

Question

This is my HTML POST Form.

  

    

  
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Answer 1

You will have to calculate the signature from backend. Follow these details Calculating a Signature to implement at your own.

That would be something like this:

$kDate = hash_hmac('sha256', $short_date, 'AWS4' . $secret_key, true);
$kRegion = hash_hmac('sha256', $region, $kDate, true);
$kService = hash_hmac('sha256', "s3", $kRegion, true);
$kSigning = hash_hmac('sha256', "aws4_request", $kService, true);
$signature = hash_hmac('sha256', base64_encode($policy), $kSigning);

Or you can use any of the AWS SDKs of your choice.

For example using PHP SDK you would implement:

Aws\Signature\S3SignatureV4