s3blob

package main

import (
	"context"
	"fmt"
	"log"
	"os"

	"github.com/aws/aws-sdk-go/aws/session"
	"gocloud.dev/blob/s3blob"
)

func main() {
	// Set the environment variables AWS uses to load the session.
	// https://docs.aws.amazon.com/sdk-for-go/api/aws/session/
	prevAccessKey := os.Getenv("AWS_ACCESS_KEY")
	prevSecretKey := os.Getenv("AWS_SECRET_KEY")
	prevRegion := os.Getenv("AWS_REGION")
	os.Setenv("AWS_ACCESS_KEY", "myaccesskey")
	os.Setenv("AWS_SECRET_KEY", "mysecretkey")
	os.Setenv("AWS_REGION", "us-east-1")
	defer func() {
		os.Setenv("AWS_ACCESS_KEY", prevAccessKey)
		os.Setenv("AWS_SECRET_KEY", prevSecretKey)
		os.Setenv("AWS_REGION", prevRegion)
	}()

	// Establish an AWS session.
	session, err := session.NewSession(nil)
	if err != nil {
		log.Fatal(err)
	}

	// Create a *blob.Bucket.
	ctx := context.Background()
	b, err := s3blob.OpenBucket(ctx, session, "my-bucket", nil)
	if err != nil {
		log.Fatal(err)
	}
	_, err = b.ReadAll(ctx, "my-key")
	if err != nil {
		// This is expected due to the fake credentials we used above.
		fmt.Println("ReadAll failed due to invalid credentials")
	}

}

Output:

ReadAll failed due to invalid credentials

package main

import (
	"context"

	"gocloud.dev/blob"
)

func main() {
	_, _ = blob.Open(context.Background(), "s3://my-bucket")

}