use bucket and prefix to specify search path in s3

search_params.go

package main

import (
	"fmt"
	"log"
	"os"
	"strings"

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

//don't hardcode your credentials, I am just including them here for completeness
//see https://docs.aws.amazon.com/sdk-for-go/v1/developer-guide/setting-up.html for more info on how to do this correctly
const awsAccessKeyID = "keykey"
const awsSecretAccessKey = "secretsecret"

func main() {
	//establish a session...

  //essential for establishing a search path
	bucket := "mybucket"
	prefix := "super/specific/path"

  //used to enumerate how many items you've searched through
	itemCount := 0
	jsonCount := 0
	pageNum := 0

	//use the bucket and prefix to localize the search in s3
	s3InputParams := &s3.ListObjectsInput{Bucket: aws.String(bucket), Prefix: aws.String(prefix)}

	//iterate through our objects

	fmt.Println("")
	fmt.Println("Found", jsonCount, "info.json files in bucket", bucket, "out of", itemCount, "items", "and", pageNum, "pages")
	fmt.Println("")
}