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package goxy

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

type Server struct {
	DataFile string
	Routes
	Entries
	wwwServer http.Server
	tlsServer http.Server
	rpcServer http.Server
}

func NewServer(dataFile, listenWWW, listenTLS, listenRPC string) (*Server, error) {
	if listenRPC == "" {
		listenRPC = RPCPort
	}
	r := make(Routes)
	server := &Server{
		DataFile: dataFile,
		Routes:   r,
		wwwServer: http.Server{
			Addr: listenWWW,
		},
		tlsServer: http.Server{
			Addr: listenTLS,
			TLSConfig: &tls.Config{
				GetCertificate: r.GetCertificate,
			},
		},
		rpcServer: http.Server{
			Addr: listenRPC,
		},
	}
	if dataFile != "" {
		server.Load(dataFile)
	}
	RegisterRPC(server)
	http.Handle("/debug/route", server.Routes)
	return server, server.Update()
}

func NewRedirect(host string) http.Handler {
	return http.RedirectHandler(host, http.StatusMovedPermanently)
}

func NewReverseProxy(target *url.URL) *httputil.ReverseProxy {
	return httputil.NewSingleHostReverseProxy(target)
}

// Update routes from in-memory state
func (s *Server) Update() error {
	wwwMux := http.NewServeMux()
	tlsMux := http.NewServeMux()
	for _, v := range s.Routes {
		host := v.ServerName.Host + v.ServerName.Path
		up := v.Upstream
		switch v.ServerName.Scheme {
		case "http", "":
			wwwMux.Handle(host, NewReverseProxy(up))
		case "https":
			wwwMux.Handle(host, NewRedirect("https://"+host))
			tlsMux.Handle(host, NewReverseProxy(up))
		case "ws":
			wwwMux.Handle(host, NewWebSocketProxy(up))
		case "wss":
			wwwMux.Handle(host, NewRedirect("wss://"+host))
			tlsMux.Handle(host, NewWebSocketProxy(up))
		}
	}
	s.wwwServer.Handler = wwwMux
	s.tlsServer.Handler = tlsMux
	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
}