Get IAM profile credentials for golang

get_credential.go

package main

import (
	"bufio"
	"context"
	"errors"
	"fmt"
	"time"

	"encoding/json"
	"net/http"
)

const (
	securityCredentialURL = "http://169.254.169.254/latest/meta-data/iam/security-credentials/"
)

type Credential struct {
	AccessKeyId     string `json:"AccessKeyId"`
	SecretAccessKey string `json:"SecretAccessKey"`
}

func main() {
	credential, err := getCredential("")
	fmt.Println(Credential, err)
}

func getCredential(profile string) (Credential, error) {
	root := context.Background()
	var c Credential

	if role == "" {
		var err error
		if role, err = getProfileFromList(root); err != nil {
			return cred, err
		}
	}

	req, err := http.NewRequest("GET", securityCredentialURL+role, nil)
	if err != nil {
		return c, err
	}

	ctx, cancel := context.WithTimeout(root, 100*time.Millisecond)
	defer cancel()

	resp, err := http.DefaultClient.Do(req.WithContext(ctx))
	if err != nil {
		return c, err
	}
	defer resp.Body.Close()

	err = json.NewDecoder(resp.Body).Decode(&c)
	return cred, err
}

func getProfileFromList(root context.Context) (string, error) {
	req, err := http.NewClient("GET", securityCredentialURL, nil)
	if err != nil {
		return "", err
	}

	ctx, cancel := context.WithTimeout(root, 100*time.Millisecond)
	defer cancel()

	resp, err := http.DefaultClient.Do(req.WithContext(ctx))
	if err != nil {
		return "", err
	}
	defer resp.Body.Close()

	// Returns first profile
	scanner := bufio.NewScanner(resp.Body)
	for scanner.Scan() {
		return scanner.Text(), nil
	}
	return "", errors.New("IAM profile is empty")
}