Htykuut

I'm trying to make an upload have an ACL of public-read. The docs are super thin for Amazonica, and after hours of tinkering, I'm no closer to figuring out how to accomplish this goal. In short, I can't figure out how to get it to sign the header.

Server side, my code looks like this.

(s3/generate-presigned-url 

  creds

  {:bucket-name          "mybucket"

   :method               "PUT"

   :expires              10000

   :key                  "my-key"

   :cache-control        "max-age=31557600;"

   :request-parameters {:x-amz-acl "public-read"}

   })

Client side, I grab the URL that creates and do an XHR PUT request

var xhr = new XMLHttpRequest();

    xhr.open("PUT", signedUrl);

    xhr.setRequestHeader('Cache-Control', 'max-age=31557600')

    xhr.onload = ...

    xhr.onerror = ...

xhr.send(file);

And this works perfectly, with the exception that it has the wrong ACL: "private" rather than "public"

Adding it client side is easy

var xhr = new XMLHttpRequest();

    xhr.open("PUT", signedUrl);

    xhr.setRequestHeader('Cache-Control', 'max-age=31557600')

    xhr.setRequestHeader('x-amz-acl', 'public-read')

    xhr.onload = ...

    xhr.onerror = ...

xhr.send(file);

But the request of course fails due to HeadersNotSigned. I can't at all figure out how to add it server side so that they get signed. The SignedHeaders section never includes any additional parameters.

I've blindly tried all sorts of combos

(s3/generate-presigned-url 

  creds

  {:headers              {:x-amz-acl "public-read"}

   :x-amz-acl            "public-read"

   :metadata             {:x-amz-acl "public-read"}

   :signed-headers       {:x-amz-acl "public-read"}

   :amz-acl "public-read"

   :x-amz-signed-headers {:x-amz-acl "public-read"}

   :X-Amz-SignedHeaders ["x-amz-acl"]

   :request-parameters {:x-amz-acl "public-read"}

   })

How do you add an ACL policy to a signed url?

I don't have a direct answer to that, but a workaround for your consideration: making all objects in your s3 bucket default to public-read.

You can do this by adding this bucket policy to your bucket (replace bucketnm of course):

{

  "Id": "Policy1397632521960",

  "Statement": [

    {

      "Sid": "Stmt1397633323327",

      "Action": [

        "s3:GetObject"

      ],

      "Effect": "Allow",

      "Resource": "arn:aws:s3:::bucketnm/*",

      "Principal": {

        "AWS": [

          "*"

        ]

      }

    }

  ]

}