Create a way to export ca configurations.

commands/export.go

@@ -0,0 +1,74 @@
+package commands
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+
+	"github.com/pkg/errors"
+	"github.com/smallstep/certificates/authority"
+	"github.com/smallstep/certificates/authority/config"
+	"github.com/urfave/cli"
+	"google.golang.org/protobuf/encoding/protojson"
+
+	"go.step.sm/cli-utils/command"
+	"go.step.sm/cli-utils/errs"
+)
+
+func init() {
+	command.Register(cli.Command{
+		Name:      "export",
+		Usage:     "export the current configuration of step-ca",
+		UsageText: "**step-ca export** <config>",
+		Action:    exportAction,
+		Description: `**step-ca export** exports the current configuration of step-ca.
+
+## POSITIONAL ARGUMENTS
+
+<config>
+:  The ca.json that contains the step-ca configuration.
+
+## EXAMPLES
+
+Export the current configuration:
+'''
+$ step-ca export $(step path)/config/ca.json
+'''`,
+	})
+}
+
+func exportAction(ctx *cli.Context) error {
+	if err := errs.NumberOfArguments(ctx, 1); err != nil {
+		return err
+	}
+
+	configFile := ctx.Args().Get(0)
+
+	config, err := config.LoadConfiguration(configFile)
+	if err != nil {
+		return err
+	}
+
+	auth, err := authority.New(config)
+	if err != nil {
+		return err
+	}
+
+	export, err := auth.Export()
+	if err != nil {
+		return err
+	}
+
+	b, err := protojson.Marshal(export)
+	if err != nil {
+		return errors.Wrap(err, "error marshaling export")
+	}
+
+	var buf bytes.Buffer
+	if err := json.Indent(&buf, b, "", "\t"); err != nil {
+		return errors.Wrap(err, "error indenting export")
+	}
+
+	fmt.Println(buf.String())
+	return nil
+}