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main.go
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main.go
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package main
import (
"bytes"
"encoding/base64"
"encoding/json"
"errors"
"flag"
"fmt"
"io/ioutil"
"os"
)
var (
ErrorMalformedToken = errors.New("That token is not valid")
)
type Arguments struct {
Token string
KeyURI string
}
func decodeAndUnmarshal(encoding *base64.Encoding, encoded []byte) (map[string]interface{}, error) {
decoder := base64.NewDecoder(encoding, bytes.NewReader(encoded))
decoded, err := ioutil.ReadAll(decoder)
if err != nil {
return nil, err
}
unmarshalled := make(map[string]interface{})
err = json.Unmarshal(decoded, &unmarshalled)
return unmarshalled, err
}
func displayToken(token []byte) error {
parts := bytes.Split(token, []byte{'.'})
if len(parts) < 2 {
return ErrorMalformedToken
}
header, err := decodeAndUnmarshal(base64.StdEncoding, parts[0])
if err != nil {
return err
}
fmt.Println(header)
payload, err := decodeAndUnmarshal(base64.StdEncoding, parts[1])
if err != nil {
return err
}
fmt.Println(payload)
return nil
}
func main() {
var arguments Arguments
flag.StringVar(&arguments.Token, "t", "", "The JWT token. If not supplied, a token is expected from stdin.")
flag.StringVar(&arguments.KeyURI, "k", "", "the URI of a public key for verification (optional)")
flag.Parse()
var (
token []byte
err error
)
if len(arguments.Token) == 0 {
token, err = ioutil.ReadAll(os.Stdin)
if err != nil {
fmt.Fprintf(os.Stdout, "Unable to read token from stdin: %s\n", err)
return
}
} else {
token = []byte(arguments.Token)
}
if err = displayToken(token); err != nil {
fmt.Fprintf(os.Stdout, "%s\n", err)
}
}