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package jose
import (
"fmt"
"io/ioutil"
"os"
"regexp"
"strings"
"github.com/pkg/errors"
"github.com/smallstep/cli/jose"
"github.com/urfave/cli"
)
// Command returns the cli.Command for jose related subcommands.
func Command() cli.Command {
return cli.Command{
Name: "jose",
Usage: "collection of JOSE utilities",
UsageText: "step crypto jose <subcommand> [arguments] [global-flags] [subcommand-flags]",
Subcommands: cli.Commands{
formatCommand(),
},
}
}
type serializer interface {
CompactSerialize() (string, error)
FullSerialize() string
}
func formatCommand() cli.Command {
return cli.Command{
Name: "format",
Usage: "swap serialization format",
UsageText: `**step crypto jose format**`,
Action: cli.ActionFunc(formatAction),
Description: `**step crypto jose format** reads a JWT, a JWS, or a JWE from STDIN swaps the
serialization of the content, from compact to JSON or from JSON to compact.
## EXAMPLES
Transform a JSON encrypted message to the compact serialization format:
'''
$ echo The message | step crypto jwe encrypt --key p256.enc.pub | step crypto jose format
eyJhbGciOiJFQ0RILUVTIiwiZW5jIjoiQTI1NkdDTSIsImVwayI6eyJrdHkiOiJFQyIsImNydiI6IlAtMjU2IiwieCI6IlNTR1pNdjZyMGlHbmtsMnpKRERXS1JlaDU4R3RwTjVjT2tBZnlaaUI0enMiLCJ5IjoiLUJzQ2w5RjZNd28zRWZoTFJIeVdDbGlxU2d6T2tubzNuWW80azlPSVk0TSJ9LCJraWQiOiJHd0tSTUdXY1pWNFE2dGZZblpjZm90N090N2hjQ0t2cUJPVWljX0JoZ0gwIn0
.
.
iJNn8SrqE8I5Bhog
.
NO9FfC25Ow9ogzq1.6M3Jiy_osGwlioJjXPyl9w
'''
Transform a compact token to the JSON serialization format:
'''
$ step crypto jwt sign --key p256.priv.json --iss "joe" --aud "bob" \
--sub "hello" --exp $(date -v+1M +"%s") | step crypto jose format
{
"payload":"eyJhdWQiOiJib2IiLCJleHAiOjE1MzUyNDE4OTYsImlhdCI6MTUzMjU2MzQ5OCwiaXNzIjoiam9lIiwibmJmIjoxNTMyNTYzNDk4LCJzdWIiOiJoZWxsbyJ9",
"protected":"eyJhbGciOiJFUzI1NiIsImtpZCI6IlpqR1g5N0xtY2ZsUG9sV3Zzb0FXekM1V1BXa05GRkgzUWRLTFVXOTc4aGsiLCJ0eXAiOiJKV1QifQ",
"signature":"wlRDGrjQItHFu5j2H4A4T6_P5Ek00ugJXQ3iIXibsZjU96_BaqddnAqFWeKpb6xHWGRAHKtlm9bUYBfLQ8Jlsg"
}
'''`,
}
}
func formatAction(ctx *cli.Context) error {
input, err := ioutil.ReadAll(os.Stdin)
if err != nil {
return errors.Wrap(err, "error reading input")
}
token := stripWhitespace(string(input))
// Attempt to parse an encrypted
// If it fails parse a regular JWS
var srz serializer
if enc, err := jose.ParseEncrypted(token); err == nil {
srz = enc
} else {
tok, err := jose.ParseJWS(token)
if err != nil {
return errors.Wrap(trimPrefix(err), "error parsing data")
}
srz = tok
}
if strings.HasPrefix(token, "{") {
str, err := srz.CompactSerialize()
if err != nil {
return errors.Wrap(trimPrefix(err), "error serializing data")
}
fmt.Println(str)
} else {
fmt.Println(srz.FullSerialize())
}
return nil
}
func trimPrefix(err error) error {
return errors.New(strings.TrimPrefix(err.Error(), "square/go-jose: "))
}
var stripWhitespaceRegex = regexp.MustCompile(`\s`)
// stripWhitespace strip all newlines and whitespace
func stripWhitespace(data string) string {
return stripWhitespaceRegex.ReplaceAllString(data, "")
}
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