feat(client): tenant management commands

internal/command/client/tenant/flag/flag.go

@@ -0,0 +1,37 @@
+package flag
+
+import (
+	clientFlag "forge.cadoles.com/Cadoles/emissary/internal/command/client/flag"
+	"forge.cadoles.com/Cadoles/emissary/internal/datastore"
+	"github.com/pkg/errors"
+	"github.com/urfave/cli/v2"
+)
+
+func WithTenantFlags(flags ...cli.Flag) []cli.Flag {
+	baseFlags := clientFlag.ComposeFlags(
+		&cli.StringFlag{
+			Name:  "tenant-id",
+			Usage: "use `TENANT_ID` as targeted tenant",
+			Value: "",
+		},
+	)
+
+	flags = append(flags, baseFlags...)
+
+	return flags
+}
+
+func AssertTenantID(ctx *cli.Context) (datastore.TenantID, error) {
+	rawTenantID := ctx.String("tenant-id")
+
+	if rawTenantID == "" {
+		return "", errors.New("flag 'tenant-id' is required")
+	}
+
+	tenantID, err := datastore.ParseTenantID(rawTenantID)
+	if err != nil {
+		return "", errors.WithStack(err)
+	}
+
+	return tenantID, nil
+}