Resolve project name to project ID if no ID is configured.

internal/openstack/client.go

@@ -22,6 +22,7 @@ import (
 
 	"github.com/gophercloud/gophercloud"
 	"github.com/gophercloud/gophercloud/openstack"
+	"github.com/gophercloud/gophercloud/openstack/identity/v3/projects"
 	"github.com/gophercloud/utils/openstack/clientconfig"
 
 	netutil "k8s.io/apimachinery/pkg/util/net"
@@ -144,10 +145,18 @@ func NewClient(cfg *AuthOpts) (*OpenStackClient, error) {
 		return nil, err
 	}
 
+	projectID := cfg.ProjectID
+	if projectID == "" {
+		projectID, err = getProjectID(provider, cfg)
+		if err != nil {
+			return nil, err
+		}
+	}
+
 	return &OpenStackClient{
 		provider:  provider,
 		region:    cfg.Region,
-		projectID: cfg.ProjectID,
+		projectID: projectID,
 	}, nil
 }
 
@@ -156,3 +165,31 @@ func (client *OpenStackClient) NewNetworkV2() (*gophercloud.ServiceClient, error
 		Region: client.region,
 	})
 }
+
+// Use the project name and project domain ID from the auth options to get the project ID.
+func getProjectID(provider *gophercloud.ProviderClient, cfg *AuthOpts) (string, error) {
+	identityClient, err := openstack.NewIdentityV3(provider, gophercloud.EndpointOpts{Region: cfg.Region})
+	if err != nil {
+		return "", err
+	}
+
+	projectPage, err := projects.List(
+		identityClient,
+		projects.ListOpts{DomainID: cfg.ProjectDomainID, Name: cfg.ProjectName},
+	).AllPages()
+	if err != nil {
+		return "", err
+	}
+
+	projectList, err := projects.ExtractProjects(projectPage)
+	if err != nil {
+		return "", err
+	}
+
+	// Project names are unique within their domain, so there should never be more than one result.
+	if len(projectList) < 1 {
+		return "", fmt.Errorf("no project named %s in domain %s", cfg.ProjectName, cfg.DomainID)
+	}
+
+	return projectList[0].ID, nil
+}