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reverseproxy.go
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reverseproxy.go
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package reverseproxy
import (
"crypto/tls"
"net"
"net/http"
"net/http/httputil"
"net/url"
"path"
"strconv"
"strings"
"sync"
"github.com/gorilla/websocket"
"github.com/koding/kite"
"github.com/koding/kite/config"
"github.com/koding/websocketproxy"
)
const (
Version = "0.0.1"
Name = "proxy"
)
type Proxy struct {
Kite *kite.Kite
listener net.Listener
TLSConfig *tls.Config
readyC chan bool // To signal when kite is ready to accept connections
closeC chan bool // To signal when kite is closed with Close()
// Holds registered kites. Keys are kite IDs.
kites map[string]url.URL
kitesMu sync.Mutex
// muxer for proxy
mux *http.ServeMux
websocketProxy http.Handler
httpProxy http.Handler
// Proxy properties used to give urls and bind the listener
Scheme string
PublicHost string // If given it must match the domain in certificate.
PublicPort int // Uses for registering and defining the public port.
}
func New(conf *config.Config) *Proxy {
k := kite.New(Name, Version)
k.Config = conf
p := &Proxy{
Kite: k,
kites: make(map[string]url.URL),
readyC: make(chan bool),
closeC: make(chan bool),
mux: http.NewServeMux(),
}
// third part kites are going to use this to register themself to
// proxy-kite and get a proxy url, which they use for register to kontrol.
p.Kite.HandleFunc("register", p.handleRegister)
// create our websocketproxy http.handler
p.websocketProxy = &websocketproxy.WebsocketProxy{
Backend: p.backend,
Upgrader: &websocket.Upgrader{
ReadBufferSize: 4096,
WriteBufferSize: 4096,
CheckOrigin: func(r *http.Request) bool {
// TODO: change this to publicdomain and also kites should add them to
return true
},
},
}
p.httpProxy = &httputil.ReverseProxy{
Director: p.director,
}
p.mux.Handle("/", k)
p.mux.Handle("/proxy/", p)
// OnDisconnect is called whenever a kite is disconnected from us.
k.OnDisconnect(func(r *kite.Client) {
k.Log.Info("Removing kite Id '%s' from proxy. It's disconnected", r.Kite.ID)
delete(p.kites, r.Kite.ID)
})
return p
}
// ServeHTTP implements the http.Handler interface.
func (p *Proxy) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
if isWebsocket(req) {
// we don't use https explicitly, ssl termination is done here
req.URL.Scheme = "ws"
p.websocketProxy.ServeHTTP(rw, req)
return
}
p.httpProxy.ServeHTTP(rw, req)
}
// isWebsocket checks wether the incoming request is a part of websocket
// handshake
func isWebsocket(req *http.Request) bool {
if strings.ToLower(req.Header.Get("Upgrade")) != "websocket" ||
!strings.Contains(strings.ToLower(req.Header.Get("Connection")), "upgrade") {
return false
}
return true
}
func (p *Proxy) CloseNotify() chan bool {
return p.closeC
}
func (p *Proxy) ReadyNotify() chan bool {
return p.readyC
}
func (p *Proxy) handleRegister(r *kite.Request) (interface{}, error) {
kiteUrl, err := url.Parse(r.Args.One().MustString())
if err != nil {
return nil, err
}
p.kites[r.Client.ID] = *kiteUrl
proxyURL := url.URL{
Scheme: p.Scheme,
Host: p.PublicHost + ":" + strconv.Itoa(p.PublicPort),
Path: "/proxy/" + r.Client.ID,
}
s := proxyURL.String()
p.Kite.Log.Info("Registering kite with url: '%s'. Can be reached now with: '%s'", kiteUrl, s)
return s, nil
}
func (p *Proxy) backend(req *http.Request) *url.URL {
withoutProxy := strings.TrimPrefix(req.URL.Path, "/proxy")
paths := strings.Split(withoutProxy, "/")
if len(paths) == 0 {
p.Kite.Log.Error("Invalid path '%s'", req.URL.String())
return nil
}
// remove the first empty path
paths = paths[1:]
// get our kiteId and individuals paths
kiteId, rest := paths[0], path.Join(paths[1:]...)
p.Kite.Log.Info("[%s] Incoming proxy request for scheme: '%s', endpoint '/%s'",
kiteId, req.URL.Scheme, rest)
p.kitesMu.Lock()
defer p.kitesMu.Unlock()
backendURL, ok := p.kites[kiteId]
if !ok {
p.Kite.Log.Error("kite for id '%s' is not found: %s", kiteId, req.URL.String())
return nil
}
// backendURL.Path contains the baseURL, like "/kite" and rest contains
// SockJS related endpoints, like /info or /123/kjasd213/websocket
backendURL.Scheme = req.URL.Scheme
backendURL.Path += "/" + rest
p.Kite.Log.Info("[%s] Proxying to backend url: '%s'.", kiteId, backendURL.String())
return &backendURL
}
func (p *Proxy) director(req *http.Request) {
u := p.backend(req)
if u == nil {
return
}
// we don't use https explicitly, ssl termination is done here
req.URL.Scheme = "http"
req.URL.Host = u.Host
req.URL.Path = u.Path
}
// ListenAndServe listens on the TCP network address addr and then calls Serve
// with handler to handle requests on incoming connections.
func (p *Proxy) ListenAndServe() error {
var err error
p.listener, err = net.Listen("tcp4",
net.JoinHostPort(p.Kite.Config.IP, strconv.Itoa(p.Kite.Config.Port)))
if err != nil {
return err
}
p.Kite.Log.Info("Listening on: %s", p.listener.Addr().String())
close(p.readyC)
server := http.Server{
Handler: p.mux,
}
defer close(p.closeC)
return server.Serve(p.listener)
}
func (p *Proxy) ListenAndServeTLS(certFile, keyFile string) error {
cert, err := tls.LoadX509KeyPair(certFile, keyFile)
if err != nil {
p.Kite.Log.Fatal("Could not load cert/key files: %s", err.Error())
}
tlsConfig := &tls.Config{
Certificates: []tls.Certificate{cert},
}
p.listener, err = net.Listen("tcp",
net.JoinHostPort(p.Kite.Config.IP, strconv.Itoa(p.Kite.Config.Port)))
if err != nil {
p.Kite.Log.Fatal(err.Error())
}
p.Kite.Log.Info("Listening on: %s", p.listener.Addr().String())
// now we are ready
close(p.readyC)
p.listener = tls.NewListener(p.listener, tlsConfig)
server := &http.Server{
Handler: p.mux,
TLSConfig: tlsConfig,
}
defer close(p.closeC)
return server.Serve(p.listener)
}
func (p *Proxy) Run() {
p.ListenAndServe()
}