S3Proxy is an http proxy to AWS S3 private buckets written in Go.

Using your AWS API credentials, S3Proxy allows you to make unauthenticated HTTP requests to download objects from your private S3 bucket.

This makes it easy for tools like curl to access private buckets:

Eg. Assuming you have a S3 bucket named bucket1 and it has the following structure folder1/folder2/item.txt.

curl http://localhost:9090/bucket1/folder1/folder2/item.txt

WARNING: It's probably never a good idea to run this on a publicly accessible network/server, but rather private/local networks.

• S3Proxy
• Table of contents
• Prerequisites
• Development
• Usage

Setup your development environment, see https://golang.org/doc/code.html.

Running the build script requires the go vet and go cover tool, which is obtained as follows:

go get golang.org/x/tools/cmd/vet
go get golang.org/x/tools/cmd/cover

If you want to make modifications to S3Proxy, clone this repo, ensure that all the prerequisites are met, make your changes and run the build script make.

Pull requests are more than welcome if you would like to contribute back to S3Proxy.

It is best to use this with an AWS IAM user with a minimal access policy. See the following example policy. This provides s3 ReadOnly access to all your buckets. Just add a Deny statement for each bucket you want to keep private.

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": [
        "s3:Get*",
        "s3:List*"
      ],
      "Resource": "*"
    }
  ]
}

export AWS_ACCESS_KEY=<your access key>
export AWS_SECRET_KEY=<you secret key>

./bin/S3Proxy