Authorization with Spaces using Go

September 27, 2017 2.1k views
Go API Object Storage
MattJBrowning
By:
MattJBrowning

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

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1 Answer
asb MOD October 16, 2017

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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