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|
package main
import (
"context"
"crypto/tls"
"fmt"
"net"
"net/http"
"net/http/httputil"
"net/url"
)
type multipleReverseProxyServer struct {
rules []rewriteRule
}
type rewriteRule struct {
fromHost string
toUrl *url.URL
proxy *httputil.ReverseProxy
}
func newMultipleReverseProxyServer(ps []ProxyConfig) *multipleReverseProxyServer {
var rules []rewriteRule
for _, p := range ps {
targetUrl, err := url.Parse(fmt.Sprintf("http://%s:%d", p.To.Host, p.To.Port))
if err != nil {
// This setting should be validated when loading config.
panic(err)
}
rules = append(rules, rewriteRule{
fromHost: p.From.Host,
toUrl: targetUrl,
proxy: &httputil.ReverseProxy{
Rewrite: func(r *httputil.ProxyRequest) {
r.SetURL(targetUrl)
r.SetXForwarded()
},
},
})
}
return &multipleReverseProxyServer{
rules: rules,
}
}
func (s *multipleReverseProxyServer) tryServeHTTP(
w http.ResponseWriter,
r *http.Request,
hostWithoutPort string,
) bool {
for _, rule := range s.rules {
if rule.fromHost == hostWithoutPort {
rule.proxy.ServeHTTP(w, r)
return true
}
}
return false
}
type Server struct {
s http.Server
tlsEnabled bool
}
func NewServer(cfg *ServerConfig) *Server {
h := http.NewServeMux()
if cfg.ACMEChallenge != nil {
h.Handle(
"/.well-known/acme-challenge/",
http.FileServer(http.Dir(cfg.ACMEChallenge.Root)),
)
}
if cfg.RedirectToHTTPS {
h.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
target := r.URL
target.Scheme = "https"
target.Host = r.Host
http.Redirect(w, r, target.String(), http.StatusMovedPermanently)
})
} else {
reverseProxyServer := newMultipleReverseProxyServer(cfg.Proxies)
h.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
// r.Host may have ":port" part.
hostWithoutPort, _, err := net.SplitHostPort(r.Host)
if err != nil {
http.Error(w, "400 invalid host", http.StatusBadRequest)
return
}
found := reverseProxyServer.tryServeHTTP(w, r, hostWithoutPort)
if !found {
http.NotFound(w, r)
}
})
}
var tlsConfig *tls.Config
if cfg.TLSCertFile != "" && cfg.TLSKeyFile != "" {
cert, err := tls.LoadX509KeyPair(cfg.TLSCertFile, cfg.TLSKeyFile)
if err != nil {
panic(err)
}
tlsConfig = &tls.Config{
Certificates: []tls.Certificate{cert},
}
}
return &Server{
tlsEnabled: cfg.Protocol == "https",
s: http.Server{
Addr: fmt.Sprintf("%s:%d", cfg.Host, cfg.Port),
Handler: h,
TLSConfig: tlsConfig,
},
}
}
func (s *Server) Label() string {
return s.s.Addr
}
func (s *Server) Serve(listener net.Listener) error {
if s.tlsEnabled {
return s.s.ServeTLS(listener, "", "")
} else {
return s.s.Serve(listener)
}
}
func (s *Server) Shutdown(ctx context.Context) {
s.s.Shutdown(ctx)
}
func NewListener(cfg *ServerConfig) (net.Listener, error) {
return net.Listen("tcp", fmt.Sprintf("%s:%d", cfg.Host, cfg.Port))
}
|
