feat: Refactoring admin APIs: changes i/o data transfer encoding to xml, implements traditional aws-like error handling, adds admin role checker middleware. Refactoring admin CLI actions to handle aws-like error responses

auth/iam.go

@@ -28,6 +28,19 @@ const (
 	RoleUserPlus Role = "userplus"
 )
 
+func (r Role) IsValid() bool {
+	switch r {
+	case RoleAdmin:
+		return true
+	case RoleUser:
+		return true
+	case RoleUserPlus:
+		return true
+	default:
+		return false
+	}
+}
+
 // Account is a gateway IAM account
 type Account struct {
 	Access  string `json:"access"`
@@ -37,6 +50,10 @@ type Account struct {
 	GroupID int    `json:"groupID"`
 }
 
+type ListUserAccountsResult struct {
+	Accounts []Account
+}
+
 // Mutable props, which could be changed when updating an IAM account
 type MutableProps struct {
 	Secret  *string `json:"secret"`