add tls and ws listener

utils/tls.go

@@ -0,0 +1,40 @@
+package utils
+
+import (
+	"crypto/tls"
+	"crypto/x509"
+	"errors"
+	"io/ioutil"
+)
+
+// LoadTLSConfig loads the certificate from cert & key files and optional client CA file.
+func LoadTLSConfig(certFile, keyFile, caFile string) (*tls.Config, error) {
+	cert, err := tls.LoadX509KeyPair(certFile, keyFile)
+	if err != nil {
+		return nil, err
+	}
+
+	cfg := &tls.Config{Certificates: []tls.Certificate{cert}}
+
+	if pool, _ := loadCA(caFile); pool != nil {
+		cfg.ClientCAs = pool
+		cfg.ClientAuth = tls.RequireAndVerifyClientCert
+	}
+
+	return cfg, nil
+}
+
+func loadCA(caFile string) (cp *x509.CertPool, err error) {
+	if caFile == "" {
+		return
+	}
+	cp = x509.NewCertPool()
+	data, err := ioutil.ReadFile(caFile)
+	if err != nil {
+		return nil, err
+	}
+	if !cp.AppendCertsFromPEM(data) {
+		return nil, errors.New("AppendCertsFromPEM failed")
+	}
+	return
+}