client: add info command for decoding token

internal/client/commands/general.go

@@ -17,8 +17,6 @@ type generalOptions struct {
 	SuperToken string `long:"ST" description:"The passed super token is used instead of a stored one"`
 }
 
-type providerOpt string
-
 func (g *generalOptions) Check() (*model.Provider, string) {
 	p, pErr := g.checkProvider()
 	if len(g.SuperToken) > 0 {

internal/client/commands/info.go

+package commands
+
+import (
+	"bytes"
+	"encoding/base64"
+	"encoding/json"
+	"fmt"
+	"strings"
+
+	"github.com/zachmann/mytoken/internal/utils"
+)
+
+// infoCommand is a type for holding and handling the info command
+type infoCommand struct {
+	generalOptions
+	// EventHistory historyCommand `command:"history" description:"List the event history for this token"`
+	// SubTree      treeCommand    `command:"tree" description:"List the tree of subtokens for this token"`
+}
+
+// Execute implements the flags.Commander interface
+func (ic *infoCommand) Execute(args []string) error {
+	_, superToken := ic.Check()
+	if !utils.IsJWT(superToken) {
+		return fmt.Errorf("The token is not a JWT.")
+	}
+	payload := strings.Split(superToken, ".")[1]
+	decodedPayload, err := base64.StdEncoding.DecodeString(payload)
+	if err != nil {
+		return err
+	}
+	var infoBuffer bytes.Buffer
+	if err = json.Indent(&infoBuffer, decodedPayload, "", "  "); err != nil {
+		return err
+	}
+	info := infoBuffer.String()
+	fmt.Println(info)
+	return nil
+}

internal/client/commands/options.go

@@ -18,6 +18,7 @@ var options struct {
 	ST            stCommand
 	AT            atCommand
 	Revoke        revokeCommand
+	Info          infoCommand
 }
 
 var parser *flags.Parser
@@ -35,6 +36,8 @@ func init() {
 	parser.AddGroup("Config Options", "", &options.ConfigOptions)
 	parser.AddCommand("AT", "Obtain access token", "Obtain a new OpenID Connect access token", &options.AT)
 	parser.AddCommand("revoke", "Revoke super token", "Revoke a mytoken super token", &options.Revoke)
+	info, _ := parser.AddCommand("info", "Get information about a super token", "Get information about a super token", &options.Info)
+	info.SubcommandsOptional = true
 }
 
 // Parse parses the command line options and calls the specified command