Google云如何获取用于创建RequestMetadata对象的用户ID和会话ID

Question

Google云如何获取用于创建RequestMetadata对象的用户ID和会话ID。我有一个支持结算的Google云项目，如何获取用户ID和会话ID以创建RequestMetadata，如下所示：

RequestMetadata requestMetadata =
        new RequestMetadata()
            .setUserId("HashedUserId") // Make sure to hash the userID
            .setSessionId("HashedSessionID") // Make sure to hash the sessionID
            .setDomain(
                "www.google.com"); // This is the domain of the website on which the search is
    // conducted