Add 'whoami' command to display authenticated user and tenant information

This new command retrieves and presents the current user's details and associated tenant from the access token. It includes error handling for token extraction and supports multiple output formats.

Files added: 1
- internal/commands/whoami.go

Author: cx-amol-mane

internal/commands/whoami.go

@@ -0,0 +1,72 @@
+package commands
+
+import (
+	"github.com/MakeNowJust/heredoc"
+	"github.com/checkmarx/ast-cli/internal/commands/util/printer"
+	"github.com/checkmarx/ast-cli/internal/wrappers"
+	"github.com/pkg/errors"
+	"github.com/spf13/cobra"
+)
+
+const (
+	whoamiTenantClaimKey       = "tenant_name"
+	whoamiUserClaimKey         = "name"
+	whoamiUserFallbackClaimKey = "sub"
+)
+
+type whoamiView struct {
+	User   string `json:"user" format:"name:User"`
+	Tenant string `json:"tenant" format:"name:Tenant"`
+}
+
+func NewWhoamiCommand() *cobra.Command {
+	whoamiCmd := &cobra.Command{
+		Use:   "whoami",
+		Short: "Show authenticated user and tenant information",
+		Long:  "The whoami command shows authenticated user and tenant information from the current access token",
+		Example: heredoc.Doc(
+			`
+			$ cx whoami
+		`,
+		),
+		RunE: runWhoami,
+	}
+
+	addFormatFlag(whoamiCmd, printer.FormatList, printer.FormatJSON, printer.FormatTable)
+	return whoamiCmd
+}
+
+func runWhoami(cmd *cobra.Command, _ []string) error {
+	accessToken, err := wrappers.GetAccessToken()
+	if err != nil {
+		return err
+	}
+
+	user, err := extractWhoamiUser(accessToken)
+	if err != nil {
+		return errors.Wrap(err, "failed to extract authenticated user from token")
+	}
+
+	tenant, err := wrappers.ExtractFromTokenClaims(accessToken, whoamiTenantClaimKey)
+	if err != nil {
+		return errors.Wrap(err, "failed to extract tenant from token")
+	}
+
+	return printByFormat(cmd, whoamiView{
+		User:   user,
+		Tenant: tenant,
+	})
+}
+
+func extractWhoamiUser(accessToken string) (string, error) {
+	claimKeys := []string{whoamiUserClaimKey, whoamiUserFallbackClaimKey}
+	var err error
+	for _, claimKey := range claimKeys {
+		var user string
+		user, err = wrappers.ExtractFromTokenClaims(accessToken, claimKey)
+		if err == nil {
+			return user, nil
+		}
+	}
+	return "", err
+}