Here's a golang snippet that will list all of the keys under your S3 bucket using the official aws-sdk-go:
package main
import (
"fmt"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/s3"
)
func main() {
svc := s3.New(session.New(), &aws.Config{Region: aws.String("us-east-1")})
params := &s3.ListObjectsInput{
Bucket: aws.String("bucket"),
}
resp, _ := svc.ListObjects(params)
for _, key := range resp.Contents {
fmt.Println(*key.Key)
}
}