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main.go
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main.go
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package main
import (
"crypto/tls"
"flag"
"fmt"
"log"
"net/http"
"os"
"time"
"golang.org/x/net/http2"
)
const (
PORT = ":6443"
READ_TIMEOUT = 5 * time.Second
WRITE_TIMEOUT = READ_TIMEOUT
)
var (
certPath, keyPath string
)
func init() {
flag.StringVar(&certPath, "cert", "certs/server.crt", "Server certificate path.")
flag.StringVar(&keyPath, "key", "certs/server.key", "Server key path.")
}
func main() {
server, err := configureServer()
if err != nil {
log.Fatal(err)
}
log.Println("Starting to listen HTTPS server on", PORT)
// listen for HTTPS requests
if err := server.ListenAndServeTLS("", ""); err != nil {
log.Fatal(err)
}
}
// configureServer returns the HTTPS server objects configured with TLS support.
func configureServer() (server *http.Server, err error) {
var certificate *tls.Config
if certificate, err = fetchCertificate(); err != nil {
return server, err
}
server = &http.Server{
Addr: PORT,
ReadTimeout: READ_TIMEOUT,
WriteTimeout: WRITE_TIMEOUT,
TLSConfig: certificate,
}
// configure server with HTTP2 and TLS
if err := http2.ConfigureServer(server, nil); err != nil {
return server, err
}
// add handlers in the server
http.HandleFunc("/", handler)
return
}
// handler returns the response for a particular HTTP path
func handler(w http.ResponseWriter, r *http.Request) {
w.Write([]byte(fmt.Sprintf("HTTPS request from: %s\n", r.RemoteAddr))) // nolint
w.Write([]byte(fmt.Sprintf("Protocol: %s", r.Proto))) // nolint
}
// fetchCertificate render the saved certificates
func fetchCertificate() (config *tls.Config, err error) {
var (
certificate tls.Certificate
key, cert []byte
)
if cert, err = os.ReadFile(certPath); err != nil {
return nil, err
}
if key, err = os.ReadFile(keyPath); err != nil {
return nil, err
}
if certificate, err = tls.X509KeyPair(cert, key); err != nil {
return nil, err
}
config = &tls.Config{
Certificates: []tls.Certificate{certificate},
ServerName: "localhost",
}
return
}