```ruby
require 'restclient'

module Github
  class S3Uploader 
    def upload(path, metadata)
      RestClient.post("http://github.s3.amazonaws.com/", [
        ["key", "#{metadata["prefix"]}#{metadata["name"]}"],
        ["acl", metadata["acl"]],
        ["success_action_redirect", metadata["redirect"]],
        ["Filename", metadata["name"]],
        ["AWSAccessKeyId", metadata["accesskeyid"]],
        ["Policy", metadata["policy"]],
        ["Signature", metadata["signature"]],
        ["Content-Type", metadata["mime_type"]],
        ["file", File.open(path)]
      ]) do |response, request, result, &block|
        if response.code == 303
          # it worked, but don't follow the redirect
          return metadata["url"]
        else
          response.return!
        end
      end
    end
  end
end
```

Use the S3 URL returned by the Github API.
user
```ruby
require 'restclient'

module Github
  class S3Uploader 
    def upload(path, metadata)
      RestClient.post(metadata["s3_url"], [
        ["key", "#{metadata["prefix"]}#{metadata["name"]}"],
        ["acl", metadata["acl"]],
        ["success_action_redirect", metadata["redirect"]],
        ["Filename", metadata["name"]],
        ["AWSAccessKeyId", metadata["accesskeyid"]],
        ["Policy", metadata["policy"]],
        ["Signature", metadata["signature"]],
        ["Content-Type", metadata["mime_type"]],
        ["file", File.open(path)]
      ]) do |response, request, result, &block|
        if response.code == 303
          # it worked, but don't follow the redirect
          return metadata["url"]
        else
          response.return!
        end
      end
    end
  end
end
```
assistant