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http.go
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http.go
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package main
import (
"context"
"crypto/tls"
"errors"
"net"
"net/http"
"strings"
"time"
"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/apis/options"
"github.com/oauth2-proxy/oauth2-proxy/v7/pkg/logger"
)
// Server represents an HTTP server
type Server struct {
Handler http.Handler
Opts *options.Options
stop chan struct{} // channel for waiting shutdown
}
// ListenAndServe will serve traffic on HTTP or HTTPS depending on TLS options
func (s *Server) ListenAndServe() {
if s.Opts.TLSKeyFile != "" || s.Opts.TLSCertFile != "" {
s.ServeHTTPS()
} else {
s.ServeHTTP()
}
}
// ServeHTTP constructs a net.Listener and starts handling HTTP requests
func (s *Server) ServeHTTP() {
HTTPAddress := s.Opts.HTTPAddress
var scheme string
i := strings.Index(HTTPAddress, "://")
if i > -1 {
scheme = HTTPAddress[0:i]
}
var networkType string
switch scheme {
case "", "http":
networkType = "tcp"
default:
networkType = scheme
}
slice := strings.SplitN(HTTPAddress, "//", 2)
listenAddr := slice[len(slice)-1]
listener, err := net.Listen(networkType, listenAddr)
if err != nil {
logger.Fatalf("FATAL: listen (%s, %s) failed - %s", networkType, listenAddr, err)
}
logger.Printf("HTTP: listening on %s", listenAddr)
s.serve(listener)
logger.Printf("HTTP: closing %s", listener.Addr())
}
// ServeHTTPS constructs a net.Listener and starts handling HTTPS requests
func (s *Server) ServeHTTPS() {
addr := s.Opts.HTTPSAddress
config := &tls.Config{
MinVersion: tls.VersionTLS12,
MaxVersion: tls.VersionTLS12,
}
if config.NextProtos == nil {
config.NextProtos = []string{"http/1.1"}
}
var err error
config.Certificates = make([]tls.Certificate, 1)
config.Certificates[0], err = tls.LoadX509KeyPair(s.Opts.TLSCertFile, s.Opts.TLSKeyFile)
if err != nil {
logger.Fatalf("FATAL: loading tls config (%s, %s) failed - %s", s.Opts.TLSCertFile, s.Opts.TLSKeyFile, err)
}
ln, err := net.Listen("tcp", addr)
if err != nil {
logger.Fatalf("FATAL: listen (%s) failed - %s", addr, err)
}
logger.Printf("HTTPS: listening on %s", ln.Addr())
tlsListener := tls.NewListener(tcpKeepAliveListener{ln.(*net.TCPListener)}, config)
s.serve(tlsListener)
logger.Printf("HTTPS: closing %s", tlsListener.Addr())
}
func (s *Server) serve(listener net.Listener) {
srv := &http.Server{Handler: s.Handler}
// See https://golang.org/pkg/net/http/#Server.Shutdown
idleConnsClosed := make(chan struct{})
go func() {
<-s.stop // wait notification for stopping server
// We received an interrupt signal, shut down.
if err := srv.Shutdown(context.Background()); err != nil {
// Error from closing listeners, or context timeout:
logger.Printf("HTTP server Shutdown: %v", err)
}
close(idleConnsClosed)
}()
err := srv.Serve(listener)
if err != nil && !errors.Is(err, http.ErrServerClosed) {
logger.Errorf("ERROR: http.Serve() - %s", err)
}
<-idleConnsClosed
}
// tcpKeepAliveListener sets TCP keep-alive timeouts on accepted
// connections. It's used by ListenAndServe and ListenAndServeTLS so
// dead TCP connections (e.g. closing laptop mid-download) eventually
// go away.
type tcpKeepAliveListener struct {
*net.TCPListener
}
func (ln tcpKeepAliveListener) Accept() (net.Conn, error) {
tc, err := ln.AcceptTCP()
if err != nil {
return nil, err
}
err = tc.SetKeepAlive(true)
if err != nil {
logger.Printf("Error setting Keep-Alive: %v", err)
}
err = tc.SetKeepAlivePeriod(3 * time.Minute)
if err != nil {
logger.Printf("Error setting Keep-Alive period: %v", err)
}
return tc, nil
}