feat(oci): oci helm support [r8s-361] (#787)

pkg/liboras/listrepo_client.go

@@ -0,0 +1,39 @@
+package liboras
+
+import (
+	"context"
+
+	portainer "github.com/portainer/portainer/api"
+	"oras.land/oras-go/v2/registry/remote"
+)
+
+// RepositoryListClient provides an interface specifically for listing repositories
+// This exists because listing repositories isn't a standard OCI operation, and we need to handle
+// different registry types differently.
+type RepositoryListClient interface {
+	// ListRepositories returns a list of repository names from the registry
+	ListRepositories(ctx context.Context) ([]string, error)
+}
+
+// RepositoryListClientFactory creates repository listing clients based on registry type
+type RepositoryListClientFactory struct{}
+
+// NewRepositoryListClientFactory creates a new factory instance
+func NewRepositoryListClientFactory() *RepositoryListClientFactory {
+	return &RepositoryListClientFactory{}
+}
+
+// CreateListClientWithRegistry creates a repository listing client based on the registry type
+// and automatically configures it with the provided ORAS registry client for generic registries
+func (f *RepositoryListClientFactory) CreateListClientWithRegistry(registry *portainer.Registry, registryClient *remote.Registry) (RepositoryListClient, error) {
+	switch registry.Type {
+	case portainer.GitlabRegistry:
+		return NewGitlabListRepoClient(registry), nil
+	case portainer.GithubRegistry:
+		return NewGithubListRepoClient(registry), nil
+	default:
+		genericClient := NewGenericListRepoClient(registry)
+		genericClient.SetRegistryClient(registryClient)
+		return genericClient, nil
+	}
+}