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