1 files changed, 61 insertions, 0 deletions
diff --git a/types/namespace_pool.go b/types/namespace_pool.go
new file mode 100644
index 0000000..0f30567
--- /dev/null
+++ b/types/namespace_pool.go
@@ -0,0 +1,61 @@
+package types
+
+import (
+	"fmt"
+)
+
+// NamespacePool is a pool of namespaces that contain complete verification keys
+type NamespacePool struct {
+	pool map[string]*Namespace
+	list []*Namespace
+	// If we need to update this structure without a restart => add mutex.
+}
+
+// NewNameSpacePool creates a new namespace pool from a list of namespaces.  An
+// error is returned if there are duplicate namespaces or namespaces without a
+// complete verification key.  The latter is determined by namespaceWithKey().
+func NewNamespacePool(namespaces []*Namespace) (*NamespacePool, error) {
+	np := &NamespacePool{
+		pool: make(map[string]*Namespace),
+		list: make([]*Namespace, 0),
+	}
+	for _, namespace := range namespaces {
+		if !namespaceWithKey(namespace.Format) {
+			return nil, fmt.Errorf("need verification key in namespace pool: %v", namespace.Format)
+		}
+		if _, ok := np.pool[namespace.String()]; ok {
+			return nil, fmt.Errorf("duplicate namespace: %v", namespace.String())
+		}
+		np.pool[namespace.String()] = namespace
+		np.list = append(np.list, namespace)
+	}
+	return np, nil
+}
+
+// Find checks if namespace is a member of the namespace pool.
+func (np *NamespacePool) Find(namespace *Namespace) (*Namespace, bool) {
+	if _, ok := np.pool[namespace.String()]; !ok {
+		return nil, false
+	}
+	// If the passed namespace is a key fingerprint the actual key needs to be
+	// attached before returning.  Not applicable for Ed25519.  Docdoc later.
+	return namespace, true
+}
+
+// List returns a copied list of namespaces that is used by this pool.
+func (np *NamespacePool) List() []*Namespace {
+	namespaces := make([]*Namespace, len(np.list))
+	copy(namespaces, np.list)
+	return namespaces
+}
+
+// namespaceWithKey returns true if a namespace format contains a complete
+// verification key.  I.e., some formats might have a key fingerprint instead.
+func namespaceWithKey(format NamespaceFormat) bool {
+	switch format {
+	case NamespaceFormatEd25519V1:
+		return true
+	default:
+		return false
+	}
+}