[Golang] Get Instagram Highlight Stories of Specific User

package igstory

// Cookies information for accessing stories

// See the following Stack Overflow answer to get the values:
// https://stackoverflow.com/a/44773079
var config = map[string]string{
	"ds_user_id": "",
	"sessionid":  "",
	"csrftoken":  "",
	"User-Agent": "Instagram 10.3.2 (iPhone7,2; iPhone OS 9_3_3; en_US; en-US; scale=2.00; 750x1334) AppleWebKit/420+",
}

// Login Instagram first and then you can obtain *ds_user_id*
// in Chrome Developer Tools.
//
// See
// https://stackoverflow.com/a/44773079
// Or
// https://github.com/siongui/goigstorylink#obtain-cookies
func SetUserId(s string) {
	config["ds_user_id"] = s
}

// Login Instagram first and then you can obtain *sessionid*
// in Chrome Developer Tools.
//
// See
// https://stackoverflow.com/a/44773079
// Or
// https://github.com/siongui/goigstorylink#obtain-cookies
func SetSessionId(s string) {
	config["sessionid"] = s
}

// Login Instagram first and then you can obtain *csrftoken*
// in Chrome Developer Tools.
//
// See
// https://stackoverflow.com/a/44773079
// Or
// https://github.com/siongui/goigstorylink#obtain-cookies
func SetCsrfToken(s string) {
	config["csrftoken"] = s
}

package igstory

// Get highlight stories of a specific user

import (
	"errors"
	"io/ioutil"
	"net/http"
	"strconv"
	"strings"
)

const UrlUserHighlightStories = `https://i.instagram.com/api/v1/highlights/{{USERID}}/highlights_tray/`

func GetUserHighlightStories(id int64) (b []byte, err error) {
	url := strings.Replace(
		UrlUserHighlightStories,
		"{{USERID}}",
		strconv.FormatInt(id, 10),
		1)
	req, err := http.NewRequest("GET", url, nil)
	if err != nil {
		return
	}

	req.AddCookie(&http.Cookie{Name: "ds_user_id", Value: config["ds_user_id"]})
	req.AddCookie(&http.Cookie{Name: "sessionid", Value: config["sessionid"]})
	req.AddCookie(&http.Cookie{Name: "csrftoken", Value: config["csrftoken"]})

	req.Header.Set("User-Agent", config["User-Agent"])

	client := &http.Client{}
	resp, err := client.Do(req)
	if err != nil {
		return
	}
	defer resp.Body.Close()

	if resp.StatusCode != 200 {
		err = errors.New("resp.StatusCode: " + strconv.Itoa(resp.StatusCode))
		return
	}

	return ioutil.ReadAll(resp.Body)
}

package igstory

import (
	"os"
	"testing"
)

func ExampleGetUserHighlightStories(t *testing.T) {
	SetUserId(os.Getenv("IG_DS_USER_ID"))
	SetSessionId(os.Getenv("IG_SESSIONID"))
	SetCsrfToken(os.Getenv("IG_CSRFTOKEN"))
	// id of user *instagram* is 25025320
	b, err := GetUserHighlightStories(25025320)
	if err != nil {
		t.Error(err)
		return
	}
	t.Log(string(b))
}