feat: add metadata schema

Signed-off-by: Kairo Araujo <[email protected]>

ent/schema/dsse.go

@@ -41,6 +41,7 @@ func (Dsse) Edges() []ent.Edge {
 		edge.To("statement", Statement.Type).Unique(),
 		edge.To("signatures", Signature.Type),
 		edge.To("payload_digests", PayloadDigest.Type),
+		edge.To("metadata", Metadata.Type),
 	}
 }
 

ent/schema/metadata.go

@@ -0,0 +1,46 @@
+// Copyright 2022 The Archivista Contributors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package schema
+
+import (
+	"entgo.io/ent"
+	"entgo.io/ent/schema/edge"
+	"entgo.io/ent/schema/field"
+	"entgo.io/ent/schema/index"
+)
+
+type Metadata struct {
+	ent.Schema
+}
+
+func (Metadata) Fields() []ent.Field {
+	return []ent.Field{
+		field.String("key").NotEmpty().Comment("Key value for the metadata item"),
+		field.String("value").NotEmpty().Comment("Value for the metadata item"),
+	}
+}
+
+func (Metadata) Indexes() []ent.Index {
+	return []ent.Index{
+		index.Fields("key", "value").Unique(),
+	}
+}
+
+func (Metadata) Edges() []ent.Edge {
+	return []ent.Edge{
+		edge.From("envelope", Dsse.Type).
+			Ref("metadata"),
+	}
+}