Public Release

cmd/nebula-cert/print.go

@@ -0,0 +1,80 @@
+package main
+
+import (
+	"encoding/json"
+	"flag"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"os"
+	"github.com/slackhq/nebula/cert"
+	"strings"
+)
+
+type printFlags struct {
+	set  *flag.FlagSet
+	json *bool
+	path *string
+}
+
+func newPrintFlags() *printFlags {
+	pf := printFlags{set: flag.NewFlagSet("print", flag.ContinueOnError)}
+	pf.set.Usage = func() {}
+	pf.json = pf.set.Bool("json", false, "Optional: outputs certificates in json format")
+	pf.path = pf.set.String("path", "", "Required: path to the certificate")
+
+	return &pf
+}
+
+func printCert(args []string, out io.Writer, errOut io.Writer) error {
+	pf := newPrintFlags()
+	err := pf.set.Parse(args)
+	if err != nil {
+		return err
+	}
+
+	if err := mustFlagString("path", pf.path); err != nil {
+		return err
+	}
+
+	rawCert, err := ioutil.ReadFile(*pf.path)
+	if err != nil {
+		return fmt.Errorf("unable to read cert; %s", err)
+	}
+
+	var c *cert.NebulaCertificate
+
+	for {
+		c, rawCert, err = cert.UnmarshalNebulaCertificateFromPEM(rawCert)
+		if err != nil {
+			return fmt.Errorf("error while unmarshaling cert: %s", err)
+		}
+
+		if *pf.json {
+			b, _ := json.Marshal(c)
+			out.Write(b)
+			out.Write([]byte("\n"))
+
+		} else {
+			out.Write([]byte(c.String()))
+			out.Write([]byte("\n"))
+		}
+
+		if rawCert == nil || len(rawCert) == 0 || strings.TrimSpace(string(rawCert)) == "" {
+			break
+		}
+	}
+
+	return nil
+}
+
+func printSummary() string {
+	return "print <flags>: prints details about a certificate"
+}
+
+func printHelp(out io.Writer) {
+	pf := newPrintFlags()
+	out.Write([]byte("Usage of " + os.Args[0] + " " + printSummary() + "\n"))
+	pf.set.SetOutput(out)
+	pf.set.PrintDefaults()
+}