vanity-tester-backend-go/cmd/vanity-tester-backend/gql.go

package main

import (
	"bytes"
	"encoding/json"
	"fmt"
	"io"
	"net/http"
)

type Gql struct{}

func (s *Gql) getUserID(username string) (string, error) {
	headers := map[string]string{
		"Content-Type": "application/json",
		"Client-Id":    config.Gql.ClientID,
		// The headers from bellow are not really necessary, but since it's GQL,
		// it's better to fake the headers to make it more like a real browser
		// and not just an scrapper.
		"User-Agent":                     "Mozilla/5.0 (X11; Linux x86_64; rv:133.0) Gecko/20100101 Firefox/133.0",
		"Accept":                         "*/*",
		"Accept-Language":                "en-US,en;q=0.5",
		"Accept-Encoding":                "gzip, deflate, br",
		"Access-Control-Request-Method":  "POST",
		"Access-Control-Request-Headers": "authorization,client-id,client-session-id,client-version,x-device-id",
		"Referer":                        "https://www.twitch.tv/",
		"Origin":                         "https://www.twitch.tv",
		"Connection":                     "keep-alive",
	}

	query := map[string]string{"query": fmt.Sprintf(`query { user(login: "%s") { id } }`, username)}

	data, err := json.Marshal(query)
	if err != nil {
		return "", logger.Error().GetCtx().Err()
	}
	logger.Trace().Msg(string(data))

	request, err := http.NewRequest("POST", "https://gql.twitch.tv/gql", bytes.NewBuffer(data))
	if err != nil {
		return "", err
	}

	for k, v := range headers {
		request.Header.Add(k, v)
	}

	res, err := client.Do(request)
	if err != nil {
		return "", err
	}
	defer res.Body.Close()

	body, err := io.ReadAll(res.Body)

	return string(body), nil
}