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package jwk
import (
"encoding/json"
"fmt"
"io/ioutil"
"os"
"github.com/pkg/errors"
"github.com/smallstep/cli/jose"
"github.com/urfave/cli"
)
func publicCommand() cli.Command {
return cli.Command{
Name: "public",
Action: cli.ActionFunc(publicAction),
Usage: "extract a public JSON Web Key (JWK) from a private JWK",
UsageText: `**step crypto jwk public**`,
Description: `**step crypto jwk public** command reads a JWK from STDIN, derives the
corresponding public JWK, and prints the derived JWK to STDOUT.
For examples, see **step help crypto jwk**.`,
}
}
func publicAction(ctx *cli.Context) error {
b, err := ioutil.ReadAll(os.Stdin)
if err != nil {
return errors.Wrap(err, "error reading from STDIN")
}
jwk := new(jose.JSONWebKey)
// Attempt to decrypt if encrypted
if b, err = jose.Decrypt("Please enter the password to decrypt your private JWK", b); err != nil {
return err
}
// Unmarshal the plain (or decrypted JWK)
if err = json.Unmarshal(b, jwk); err != nil {
return errors.New("error reading JWK: unsupported format")
}
var public jose.JSONWebKey
// go-jose JSONWebKey.Public() returns an empty key for oct
if _, ok := jwk.Key.([]byte); ok {
public = *jwk
} else {
public = jwk.Public()
}
b, err = json.MarshalIndent(public, "", " ")
if err != nil {
return errors.Wrap(err, "error marshaling JWK")
}
fmt.Println(string(b))
return nil
}
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