Add HTTPS support to bucket server

The bucket server used by `gitops beta run` now serves over HTTP as
well as HTTPS. HTTP is still necessary as Flux's Bucket resource
doesn't have a field for providing a custom CA certificate.

This is a backwards-incompatible change as the ports the server is
listening on have to provided through flags. Also, providing TLS cert
and key is mandatory.

cmd/gitops-bucket-server/main.go

@@ -2,60 +2,59 @@ package main
 
 import (
 	"context"
+	"flag"
 	"log"
-	"net"
 	"os"
 	"os/signal"
-	"strconv"
 	"syscall"
 
 	"github.com/johannesboyne/gofakes3"
 	"github.com/johannesboyne/gofakes3/backend/s3mem"
-	"net/http/httptest"
+	"github.com/weaveworks/weave-gitops/pkg/http"
 )
 
 func main() {
 	ctx, cancel := signal.NotifyContext(
 		context.Background(),
 		syscall.SIGINT,
-		syscall.SIGTERM,
-		syscall.SIGKILL)
+		syscall.SIGTERM)
 	defer cancel()
 
 	logger := log.New(os.Stdout, "", 0)
 	backend := s3mem.New()
 	s3 := gofakes3.New(backend,
 		gofakes3.WithAutoBucket(true),
 		gofakes3.WithLogger(gofakes3.StdLog(logger, gofakes3.LogErr, gofakes3.LogWarn, gofakes3.LogInfo)))
+	s3Server := s3.Server()
 
-	port := "9000"
-	// check args
-	if len(os.Args) > 1 {
-		port = os.Args[1]
-		// part string to integer
-		_, err := strconv.Atoi(port)
-		if err != nil {
-			log.Fatalf("Invalid port number: %s", port)
-		}
-	}
+	var (
+		httpPort, httpsPort int
+		certFile, keyFile   string
+	)
 
-	// create a listener with the desired port.
-	listener, err := net.Listen("tcp", ":"+port)
-	if err != nil {
-		log.Fatal(err)
-	}
+	flag.IntVar(&httpPort, "http-port", 9000, "TCP port to listen on for HTTP connections")
+	flag.IntVar(&httpsPort, "https-port", 9443, "TCP port to listen on for HTTPS connections")
+	flag.StringVar(&certFile, "cert-file", "", "Path to the HTTPS server certificate file")
+	flag.StringVar(&keyFile, "key-file", "", "Path to the HTTPS server certificate key file")
+	flag.Parse()
 
-	ts := httptest.NewUnstartedServer(s3.Server())
-	if err := ts.Listener.Close(); err != nil {
-		log.Fatal(err)
+	if certFile == "" {
+		logger.Fatalf("please specify the path to the HTTPS server certificate file")
 	}
 
-	ts.Listener = listener
-	// Start the server.
-	ts.Start()
-	defer ts.Close()
+	if keyFile == "" {
+		logger.Fatalf("please specify the path to the HTTPS server certificate key file")
+	}
 
-	logger.Println(ts.URL)
+	srv := http.MultiServer{
+		HTTPPort:  httpPort,
+		HTTPSPort: httpsPort,
+		CertFile:  certFile,
+		KeyFile:   keyFile,
+		Logger:    logger,
+	}
 
-	<-ctx.Done()
+	if err := srv.Start(ctx, s3Server); err != nil {
+		logger.Fatalf("server exited unexpectedly: %s", err)
+	}
 }

pkg/http/server.go

@@ -0,0 +1,88 @@
+package http
+
+import (
+	"context"
+	"crypto/tls"
+	"fmt"
+	"log"
+	"net"
+	"net/http"
+	"sync"
+)
+
+// MultiServer lets you create and run an HTTP server that serves over both, HTTP and HTTPS. It is a convenience wrapper around net/http and crypto/tls.
+type MultiServer struct {
+	HTTPPort  int
+	HTTPSPort int
+	CertFile  string
+	KeyFile   string
+	Logger    *log.Logger
+}
+
+// Start creates listeners for HTTP and HTTPS and starts serving requests using the provided handler. The function blocks until both servers
+// are properly shut down. A shutdown can be initiated by cancelling the given context.
+func (srv MultiServer) Start(ctx context.Context, handler http.Handler) error {
+	var wg sync.WaitGroup
+
+	tlsListener, err := createTLSListener(srv.HTTPSPort, srv.CertFile, srv.KeyFile)
+	if err != nil {
+		return fmt.Errorf("failed to create TLS listener: %w", err)
+	}
+
+	wg.Add(1)
+
+	go func() {
+		defer wg.Done()
+		startServer(ctx, handler, tlsListener, srv.Logger)
+	}()
+
+	listener, err := net.Listen("tcp", fmt.Sprintf(":%d", srv.HTTPPort))
+	if err != nil {
+		return fmt.Errorf("failed to create TCP listener: %w", err)
+	}
+
+	wg.Add(1)
+
+	go func() {
+		defer wg.Done()
+		startServer(ctx, handler, listener, srv.Logger)
+	}()
+
+	wg.Wait()
+
+	return nil
+}
+
+func createTLSListener(port int, certFile, keyFile string) (net.Listener, error) {
+	cert, err := tls.LoadX509KeyPair(certFile, keyFile)
+	if err != nil {
+		return nil, fmt.Errorf("unable to load TLS key pair: %w", err)
+	}
+
+	listener, err := tls.Listen("tcp", fmt.Sprintf(":%d", port), &tls.Config{Certificates: []tls.Certificate{cert}})
+	if err != nil {
+		return nil, fmt.Errorf("unable to start TLS listener: %w", err)
+	}
+
+	return listener, nil
+}
+
+func startServer(ctx context.Context, hndlr http.Handler, listener net.Listener, logger *log.Logger) {
+	srv := http.Server{
+		Addr:    listener.Addr().String(),
+		Handler: hndlr,
+	}
+	logger.Printf("https://" + srv.Addr)
+
+	go func() {
+		if err := srv.Serve(listener); err != http.ErrServerClosed {
+			logger.Fatalf("server quit unexpectedly: %s", err)
+		}
+	}()
+	<-ctx.Done()
+	logger.Printf("shutting down %s", listener.Addr())
+
+	if err := srv.Shutdown(ctx); err != nil && err != context.Canceled {
+		logger.Printf("error shutting down %s: %s", listener.Addr(), err)
+	}
+}

pkg/http/server_test.go

@@ -0,0 +1,115 @@
+package http_test
+
+import (
+	"context"
+	"crypto/tls"
+	"crypto/x509"
+	"fmt"
+	"io"
+	"log"
+	"math/rand"
+	"net/http"
+	"os"
+	"testing"
+
+	. "github.com/onsi/gomega"
+
+	wegohttp "github.com/weaveworks/weave-gitops/pkg/http"
+)
+
+func TestMultiServerStartReturnsImmediatelyWithClosedContext(t *testing.T) {
+	g := NewGomegaWithT(t)
+	srv := wegohttp.MultiServer{
+		CertFile: "testdata/localhost.crt",
+		KeyFile:  "testdata/localhost.key",
+		Logger:   log.Default(),
+	}
+	ctx, cancel := context.WithCancel(context.Background())
+	cancel()
+	g.Expect(srv.Start(ctx, nil)).To(Succeed())
+}
+
+func TestMultiServerWithoutTLSConfigFailsToStart(t *testing.T) {
+	g := NewGomegaWithT(t)
+	srv := wegohttp.MultiServer{}
+	ctx, cancel := context.WithCancel(context.Background())
+	cancel()
+
+	err := srv.Start(ctx, nil)
+	g.Expect(err).To(HaveOccurred())
+	g.Expect(err.Error()).To(HavePrefix("failed to create TLS listener"))
+}
+
+func TestMultiServerServesOverBothProtocols(t *testing.T) {
+	g := NewGomegaWithT(t)
+
+	httpPort := rand.Intn(49151-1024) + 1024
+	httpsPort := rand.Intn(49151-1024) + 1024
+
+	for httpPort == httpsPort {
+		httpsPort = rand.Intn(49151-1024) + 1024
+	}
+
+	srv := wegohttp.MultiServer{
+		HTTPPort:  httpPort,
+		HTTPSPort: httpsPort,
+		CertFile:  "testdata/localhost.crt",
+		KeyFile:   "testdata/localhost.key",
+		Logger:    log.Default(),
+	}
+	ctx, cancel := context.WithCancel(context.Background())
+
+	exitChan := make(chan struct{})
+	go func(exitChan chan<- struct{}) {
+		hndlr := http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
+			fmt.Fprintf(rw, "success")
+		})
+		g.Expect(srv.Start(ctx, hndlr)).To(Succeed())
+		close(exitChan)
+	}(exitChan)
+
+	// test HTTP
+
+	resp, err := http.Get(fmt.Sprintf("http://localhost:%d/", httpPort))
+	g.Expect(err).NotTo(HaveOccurred())
+	g.Expect(resp.StatusCode).To(Equal(http.StatusOK))
+	body, err := io.ReadAll(resp.Body)
+	g.Expect(err).NotTo(HaveOccurred())
+	g.Expect(string(body)).To(Equal("success"))
+
+	// test HTTPS
+
+	certBytes, err := os.ReadFile("testdata/localhost.crt")
+	g.Expect(err).NotTo(HaveOccurred())
+
+	rootCAs := x509.NewCertPool()
+	rootCAs.AppendCertsFromPEM(certBytes)
+
+	tr := &http.Transport{
+		TLSClientConfig: &tls.Config{
+			RootCAs: rootCAs,
+		},
+	}
+	c := http.Client{
+		Transport: tr,
+	}
+	resp, err = c.Get(fmt.Sprintf("https://localhost:%d/", httpsPort))
+	g.Expect(err).NotTo(HaveOccurred())
+	g.Expect(resp.StatusCode).To(Equal(http.StatusOK))
+	body, err = io.ReadAll(resp.Body)
+	g.Expect(err).NotTo(HaveOccurred())
+	g.Expect(string(body)).To(Equal("success"))
+
+	cancel()
+	g.Eventually(exitChan, "3s").Should(BeClosed())
+
+	// ensure both ports are freed up
+
+	_, err = c.Get(fmt.Sprintf("https://localhost:%d/", httpsPort))
+	g.Expect(err).To(HaveOccurred())
+	g.Expect(err.Error()).To(ContainSubstring("connection refused"))
+
+	_, err = http.Get(fmt.Sprintf("http://localhost:%d/", httpPort))
+	g.Expect(err).To(HaveOccurred())
+	g.Expect(err.Error()).To(ContainSubstring("connection refused"))
+}

pkg/http/testdata/localhost.crt

@@ -0,0 +1,24 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----

pkg/http/testdata/localhost.key

@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----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+OZCH9GpIunsXEVLR/xR5k+Cr30ZAtvKY59rZQhKt3Q6LAE9yK4NkglV08yY314zG
+ELd/qLaNAoGBAPucQLxhQhwzSMRQiaq9cz6fyLPc1xqrD1piCTP36NOXyra76aIW
+/AbdVvSz8rfgGITFSRJ9XEaDvre4Po21JvXIXfk5oemp4Vmoo2lRS/oD56DbEzlP
+vDVid0Mk/PsK1m9ulxE7ta0B46fYCwTg+4zY+Mf6/nX4jw/voWfnuT2LAoGBAMTp
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+xGx8caLxCl1GVL/Nq79SdY4NuC/r0O9Eeosa+yf+b/fRrQtXWhjEEG9ITZ5PhLhI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+-----END RSA PRIVATE KEY-----