twitchchatters.go

package chatters

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

func ProxyChatters(w http.ResponseWriter, r *http.Request) {
	channel := r.URL.Query().Get("c")
	if channel == "" {
		must(w, fmt.Errorf("no query param"))
	}

	req, err := http.NewRequest("GET", "https://tmi.twitch.tv/group/user/" + string(channel) + "/chatters", nil)
	must(w, err)

	client := &http.Client{}
	res, err := client.Do(req)
	must(w, err)
	defer res.Body.Close()

	body, err := ioutil.ReadAll(res.Body)
	must(w, err)

	var out bytes.Buffer
	err = json.Indent(&out, body, "", "\t")
	must(w, err)

	w.Header().Set("Content-Type", "application/json")
	w.Header().Set("Access-Control-Allow-Origin", "*")
	w.WriteHeader(200)
	w.Write(out.Bytes())
}

func must(w http.ResponseWriter, err error) {
	if err != nil {
		w.Header().Set("Content-Type", "text/plain")
		w.Header().Set("Access-Control-Allow-Origin", "*")
		w.WriteHeader(500)
		w.Write([]byte("failed: " + err.Error()))
		os.Exit(1)
	}
}