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package goxy

import (
	"crypto/tls"
	"net/http"
	"net/http/httputil"
	"net/url"
	"strings"
)

type Server struct {
	DataFile string
	SNI
	Route
	wwwServer http.Server
	tlsServer http.Server
	rpcServer http.Server
}

func NewServer(dataFile, listen, listenTLS, listenRPC string) (*Server, error) {
	sni := make(SNI)

	server := &Server{
		DataFile: dataFile,
		SNI:      sni,
		Route:    make(Route),
		wwwServer: http.Server{
			Addr: listen,
		},
		tlsServer: http.Server{
			Addr: listenTLS,
			TLSConfig: &tls.Config{
				GetCertificate: sni.GetCertificate,
			},
		},
		rpcServer: http.Server{
			Addr: listenRPC,
		},
	}
	if dataFile != "" {
		server.Load(dataFile)
	}
	RegisterRPC(server)
	http.Handle("/debug/route", server.Route)
	return server, server.Update()
}

// Update routes from in-memory state
func (s *Server) Update() error {
	httpMux := http.NewServeMux()
	for k, v := range s.Route {
		if v.Cert != nil && v.Key != nil {
			cert, err := tls.X509KeyPair(v.Cert, v.Key)
			if err != nil {
				return err
			}
			s.SNI[k] = &cert
		}
		up, err := url.Parse(v.Upstream)
		if err != nil {
			return err
		}
		if !strings.Contains(v.Host, "/") {
			v.Host += "/"
		}
		switch up.Scheme {
		case "ws":
			httpMux.Handle(v.Host, NewWebSocketProxy(up))
		default:
			httpMux.Handle(v.Host, httputil.NewSingleHostReverseProxy(up))
		}
	}
	s.wwwServer.Handler = httpMux
	return nil
}

func (s *Server) Start() error {
	errc := make(chan error)
	go func() { errc <- s.wwwServer.ListenAndServe() }()
	go func() { errc <- s.tlsServer.ListenAndServeTLS("", "") }()
	go func() { errc <- s.rpcServer.ListenAndServe() }()
	return <-errc
}