Creating common token store and moving email invites and verification to it (#6213)

utils/hash.go

@@ -0,0 +1,16 @@
+// Copyright (c) 2017-present Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package utils
+
+import (
+	"crypto/sha256"
+	"fmt"
+)
+
+func HashSha256(text string) string {
+	hash := sha256.New()
+	hash.Write([]byte(text))
+
+	return fmt.Sprintf("%x", hash.Sum(nil))
+}