Local develop setup with docker (#1103)

* Add local live kit backend run setup

backend/auth/server.go

@@ -0,0 +1,98 @@
+package main
+
+import (
+	"encoding/json"
+	"log"
+	"net/http"
+	"os"
+
+	"time"
+
+	"github.com/livekit/protocol/auth"
+)
+
+type Handler struct {
+	key, secret string
+}
+
+func (h *Handler) handle(w http.ResponseWriter, r *http.Request) {
+	log.Printf("Request from %s", r.RemoteAddr)
+
+	// Set the CORS headers
+	w.Header().Set("Access-Control-Allow-Origin", "*")
+	w.Header().Set("Access-Control-Allow-Methods", "POST, GET, OPTIONS, PUT, DELETE")
+	w.Header().Set("Access-Control-Allow-Headers", "Accept, Content-Type, Content-Length, Accept-Encoding, X-CSRF-Token, Authorization")
+
+	// Handle preflight request (CORS)
+	if r.Method == "OPTIONS" {
+		w.WriteHeader(http.StatusOK)
+		return
+	}
+
+	roomName := r.URL.Query().Get("roomName")
+	name := r.URL.Query().Get("name")
+	identity := r.URL.Query().Get("identity")
+
+	log.Printf("roomName: %s, name: %s, identity: %s", roomName, name, identity)
+
+	if roomName == "" || name == "" || identity == "" {
+		w.WriteHeader(http.StatusBadRequest)
+		return
+	}
+
+	token, err := getJoinToken(h.key, h.secret, roomName, identity, name)
+	if err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+		return
+	}
+
+	res := Response{token}
+
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(res)
+}
+
+func main() {
+	key := os.Getenv("LIVEKIT_KEY")
+	secret := os.Getenv("LIVEKIT_SECRET")
+
+	// Check if the key and secret are empty.
+	if key == "" || secret == "" {
+		log.Fatal("LIVEKIT_KEY and LIVEKIT_SECRET environment variables must be set")
+	}
+
+	log.Printf("LIVEKIT_KEY: %s and LIVEKIT_SECRET %s", key, secret)
+
+	handler := &Handler{
+		key:    key,
+		secret: secret,
+	}
+
+	http.HandleFunc("/token", handler.handle)
+	log.Fatal(http.ListenAndServe(":8080", nil))
+}
+
+type Response struct {
+	Token string `json:"accessToken"`
+}
+
+func getJoinToken(apiKey, apiSecret, room, identity, name string) (string, error) {
+	at := auth.NewAccessToken(apiKey, apiSecret)
+
+	canPublish := true
+	canSubscribe := true
+	grant := &auth.VideoGrant{
+		RoomJoin:     true,
+		RoomCreate:   true,
+		CanPublish:   &canPublish,
+		CanSubscribe: &canSubscribe,
+		Room:         room,
+	}
+
+	at.AddGrant(grant).
+		SetIdentity(identity).
+		SetValidFor(time.Hour).
+		SetName(name)
+
+	return at.ToJWT()
+}