feat(storage-server): add check-token command

cmd/storage-server/command/auth/check_token.go

@@ -0,0 +1,75 @@
+package auth
+
+import (
+	"encoding/json"
+	"fmt"
+
+	"forge.cadoles.com/arcad/edge/cmd/storage-server/command/flag"
+	"forge.cadoles.com/arcad/edge/pkg/jwtutil"
+	"github.com/lestrrat-go/jwx/v2/jwa"
+	"github.com/pkg/errors"
+	"github.com/urfave/cli/v2"
+)
+
+func CheckToken() *cli.Command {
+	return &cli.Command{
+		Name:  "check-token",
+		Usage: "Validate and print the given token with the private key",
+		Flags: []cli.Flag{
+			&cli.StringFlag{
+				Name:     "token",
+				Required: true,
+			},
+			flag.PrivateKey,
+			flag.PrivateKeySigningAlgorithm,
+			flag.PrivateKeyDefaultSize,
+		},
+		Action: func(ctx *cli.Context) error {
+			privateKeyFile := flag.GetPrivateKey(ctx)
+			signingAlgorithm := flag.GetSigningAlgorithm(ctx)
+			privateKeyDefaultSize := flag.GetPrivateKeyDefaultSize(ctx)
+			rawToken := ctx.String("token")
+
+			if rawToken == "" {
+				return errors.New("you must provide a value for --token flag")
+			}
+
+			privateKey, err := jwtutil.LoadOrGenerateKey(
+				privateKeyFile,
+				privateKeyDefaultSize,
+			)
+			if err != nil {
+				return errors.WithStack(err)
+			}
+
+			keySet, err := jwtutil.NewKeySet()
+			if err != nil {
+				return errors.WithStack(err)
+			}
+
+			err = jwtutil.AddKeyWithSigningAlgo(keySet, privateKey, jwa.SignatureAlgorithm(signingAlgorithm))
+			if err != nil {
+				return errors.WithStack(err)
+			}
+
+			token, err := jwtutil.Parse([]byte(rawToken), keySet)
+			if err != nil {
+				return errors.WithStack(err)
+			}
+
+			claims, err := token.AsMap(ctx.Context)
+			if err != nil {
+				return errors.WithStack(err)
+			}
+
+			json, err := json.MarshalIndent(claims, "", "  ")
+			if err != nil {
+				return errors.WithStack(err)
+			}
+
+			fmt.Println(string(json))
+
+			return nil
+		},
+	}
+}

cmd/storage-server/command/auth/root.go

@@ -10,6 +10,7 @@ func Root() *cli.Command {
 		Usage: "Auth related command",
 		Subcommands: []*cli.Command{
 			NewToken(),
+			CheckToken(),
 		},
 	}
 }