Add command to generate a server certificate (#157)

Author: Westwooo

cmd/certificates-getservercert.go

@@ -0,0 +1,52 @@
+package cmd
+
+import (
+	"fmt"
+	"net"
+
+	"github.com/couchbaselabs/cbdinocluster/utils/dinocerts"
+	"github.com/spf13/cobra"
+	"go.uber.org/zap"
+)
+
+var certificatesGetServerCert = &cobra.Command{
+	Use:   "get-server-cert",
+	Short: "Fetches a server cert configured using the flags",
+	Args:  cobra.MinimumNArgs(0),
+	Run: func(cmd *cobra.Command, args []string) {
+		helper := CmdHelper{}
+		logger := helper.GetLogger()
+
+		rootCa, err := dinocerts.GetRootCertAuthority()
+		if err != nil {
+			logger.Fatal("failed to get dino certificate authority", zap.Error(err))
+		}
+
+		ip, _ := cmd.Flags().GetString("ip")
+		dns, _ := cmd.Flags().GetString("dns")
+
+		var ipAddrs []net.IP
+		if ip != "" {
+			ipAddrs = []net.IP{net.ParseIP(ip)}
+		}
+
+		var dnsNames []string
+		if dns != "" {
+			dnsNames = []string{dns}
+		}
+
+		cert, key, err := rootCa.MakeServerCertificate("server-cert", ipAddrs, dnsNames)
+		if err != nil {
+			logger.Fatal("failed to generate server certificate", zap.Error(err))
+		}
+
+		fmt.Printf("%s\n%s\n", cert, key)
+	},
+}
+
+func init() {
+	certificatesCmd.AddCommand(certificatesGetServerCert)
+
+	certificatesGetServerCert.Flags().String("dns", "", "The dns name for the server certificate")
+	certificatesGetServerCert.Flags().String("ip", "", "The ip address for the server cetificate")
+}