PLT-1493: Added support for permissions (#142)

* PLT-1493: Added support for permissions

* changed permission sciope to const

* added comments

* fix

client/permission.go

@@ -0,0 +1,41 @@
+package client
+
+import (
+	"fmt"
+
+	clientv1 "github.com/spectrocloud/palette-sdk-go/api/client/v1"
+	"github.com/spectrocloud/palette-sdk-go/api/models"
+)
+
+// PermissionScope defines the scope of a permission.
+type PermissionScope string
+
+const (
+	// PermissionScopeProject represents a project-level scope.
+	PermissionScopeProject PermissionScope = "project"
+
+	// PermissionScopeTenant represents a tenant-level scope.
+	PermissionScopeTenant PermissionScope = "tenant"
+
+	// PermissionScopeResource represents a resource-level scope.
+	PermissionScopeResource PermissionScope = "resource"
+)
+
+// GetPermissionByName retrieves an existing permission by name and permissionScope(project, tenant & resource).
+func (h *V1Client) GetPermissionByName(permissionName string, permissionScope PermissionScope) (*models.V1Permission, error) {
+	// ACL scoped to tenant only
+	permScope := string(permissionScope)
+	params := clientv1.NewV1PermissionsListParams().WithScope(&permScope)
+	resp, err := h.Client.V1PermissionsList(params)
+	if err != nil {
+		return nil, err
+	}
+
+	for _, permission := range resp.Payload {
+		if permission.Name == permissionName {
+			return permission, nil
+		}
+	}
+
+	return nil, fmt.Errorf("permission name '%s' not found in scope '%s'", permissionName, permissionScope)
+}