Example of listing S3 bucket objects in Go

main.go

package main

import (
	"flag"
	"fmt"

	"github.com/aws/aws-sdk-go/aws"
	"github.com/aws/aws-sdk-go/aws/session"
	"github.com/aws/aws-sdk-go/service/s3"
)

const DefaultRegion = "us-east-1"

var (
	bucket = flag.String("bucket", "", "Name of the S3 bucket to list objects from")
)

func main() {
	flag.Parse()

	sess := session.Must(session.NewSession())

	region := aws.StringValue(sess.Config.Region)
	if region == "" {
		region = DefaultRegion
	}

	s3Service := s3.New(sess, aws.NewConfig().WithRegion(region))

	err := s3Service.ListObjectsPages(&s3.ListObjectsInput{
		Bucket: bucket,
	}, func(p *s3.ListObjectsOutput, last bool) bool {
		for _, o := range p.Contents {
			fmt.Printf("Object: %v\n", *o.Key)
		}
		return true
	})
	if err != nil {
		panic(fmt.Sprintf("Failed to list objects from S3 bucket: %s: %s", *bucket, err))
	}
}