Authorization with Spaces using Go

Question

Hello, I’m need a little help with getting all the headers setup so I can get to using Spaces.

I’m doing all of this in Go and I have a few questions.

What would I set the SignedHeaders to, I see in the api docs it has it set to host;x-amz-acl;x-amz-content-sha256;x-amz-date but I’m not familiar and now sure if that changes depending on what you’re doing or not.

My next question has to do with the Signature, again not 100% on the terminology used and would like a little help getting that going. So if anyone could help me out, that would be great.

Here is the code I currently have:

func SetAuthHeaders(accessKey, yymmdd, region string, req *http.Request) {

	credentials := fmt.Sprintf("%v/%v/%v/s3/aws4_request", accessKey, yymmdd, region)
	signedHeaders := "host;x-amz-acl;x-amz-content-sha256;x-amz-date"
	signature := fmt.Sprintf("")

	req.Header.Add("Authorization", "AWS4-HMAC-SHA256")
	req.Header.Add("Credential", credentials)
	req.Header.Add("SignedHeaders", signedHeaders)
	req.Header.Add("Signature", signature)
}

Thanks

Andrew SB · Answer

Hey Matt! Spaces was designed to be API compatible with AWS’s S3 API. One trade off with this approach is that the AWS signature formats can be a bit complicated. Though the main reason we went that direct was to allow people to use pre-existing tools. So, I’d encourage you to use one of the existing libraries for working S3-compatible APIs like minio-go or AWS’ Go SDK.

Here’s a quick example using minio-go:

package main

import (
	"fmt"
	"log"
	"os"

	"github.com/minio/minio-go"
)

func main() {
	accessKey := os.Getenv("DO_ACCESS_KEY")
	secKey := os.Getenv("DO_SECRET_ACCESS_KEY")
	ssl := true

	// Initiate a client using DigitalOcean Spaces.
	client, err := minio.New("nyc3.digitaloceanspaces.com", accessKey, secKey, ssl)
	if err != nil {
		log.Fatal(err)
	}

	// Create a new Space.
	err = client.MakeBucket("my-new-space", "nyc3")
	if err != nil {
		log.Fatal(err)
	}

	// List all Spaces.
	spaces, err := client.ListBuckets()
	if err != nil {
		log.Fatal(err)
	}
	for _, space := range spaces {
		fmt.Println(space.Name)
	}
}

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