move plugin handling outside the sdk package

Signed-off-by: Nicola Murino <nicola.murino@gmail.com>

util/util.go

@@ -11,6 +11,7 @@ import (
 	"crypto/tls"
 	"crypto/x509"
 	"encoding/pem"
+	"errors"
 	"fmt"
 	"html/template"
 	"io"
@@ -422,6 +423,19 @@ func GetTLSCiphersFromNames(cipherNames []string) []uint16 {
 	return ciphers
 }
 
+// EncodeTLSCertToPem returns the specified certificate PEM encoded.
+// This can be verified using openssl x509 -in cert.crt  -text -noout
+func EncodeTLSCertToPem(tlsCert *x509.Certificate) (string, error) {
+	if len(tlsCert.Raw) == 0 {
+		return "", errors.New("invalid x509 certificate, no der contents")
+	}
+	publicKeyBlock := pem.Block{
+		Type:  "CERTIFICATE",
+		Bytes: tlsCert.Raw,
+	}
+	return string(pem.EncodeToMemory(&publicKeyBlock)), nil
+}
+
 // CheckTCP4Port quits the app if bind on the given IPv4 port fails.
 // This is a ugly hack to avoid to bind on an already used port.
 // It is required on Windows only. Upstream does not consider this