use go module for dependencies (#594)

common/keydb/keyring.go

@@ -0,0 +1,32 @@
+// Copyright 2017 New Vector Ltd
+//
+// 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 keydb
+
+import "github.com/matrix-org/gomatrixserverlib"
+
+// CreateKeyRing creates and configures a KeyRing object.
+//
+// It creates the necessary key fetchers and collects them into a KeyRing
+// backed by the given KeyDatabase.
+func CreateKeyRing(client gomatrixserverlib.Client,
+	keyDB gomatrixserverlib.KeyDatabase) gomatrixserverlib.KeyRing {
+	return gomatrixserverlib.KeyRing{
+		KeyFetchers: []gomatrixserverlib.KeyFetcher{
+			// TODO: Use perspective key fetchers for production.
+			&gomatrixserverlib.DirectKeyFetcher{Client: client},
+		},
+		KeyDatabase: keyDB,
+	}
+}