Add azure groups support and oauth2 v2.0

pkg/util/util.go

@@ -149,3 +149,16 @@ func isHostnameAllowed(hostname, allowedHost string) bool {
 
 	return false
 }
+
+// RemoveDuplicateStr removes duplicates from a slice of strings.
+func RemoveDuplicateStr(strSlice []string) []string {
+	allKeys := make(map[string]struct{})
+	var list []string
+	for _, item := range strSlice {
+		if _, ok := allKeys[item]; !ok {
+			allKeys[item] = struct{}{}
+			list = append(list, item)
+		}
+	}
+	return list
+}