Initial QSfera import

Server/vendor/github.com/libregraph/lico/identity/managers/utils.go

@@ -0,0 +1,52 @@
+/*
+ * Copyright 2017-2019 Kopano and its licensors
+ *
+ * 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 managers
+
+import (
+	"encoding/base64"
+
+	"golang.org/x/crypto/blake2b"
+
+	konnectoidc "github.com/libregraph/lico/oidc"
+)
+
+func setupSupportedScopes(scopes []string, extra []string, override []string) []string {
+	if len(override) > 0 {
+		return override
+	}
+
+	return append(scopes, extra...)
+}
+
+func getPublicSubject(sub []byte, extra []byte) (string, error) {
+	// Hash the raw subject with our specific salt.
+	hasher, err := blake2b.New512([]byte(konnectoidc.LibreGraphIDTokenSubjectSaltV1))
+	if err != nil {
+		return "", err
+	}
+
+	hasher.Write(sub)
+	hasher.Write([]byte(" "))
+	hasher.Write(extra)
+
+	// NOTE(longsleep): URL safe encoding for subject is important since many
+	// third party applications validate this with rather strict patterns. We
+	// also inject an @ to ensure its compatible to some apps which require one.
+	s := base64.RawURLEncoding.EncodeToString(hasher.Sum(nil))
+	return s[:16] + "@" + s[16:], nil
+}