FCM注册ID令牌的最大长度是多少？ [英] What is the maximum length of an FCM registration ID token?

问题描述

使用新Firebase云消息传递，我想可靠地将客户端设备 registration_id 标记保存到本地服务器数据库，以便服务器软件可以发送它们通知。

我应该使用哪个数据库字段的最小大小来保存100％的客户端注册令牌？

我发现了两个不同 使用 TextField的图书馆 和 VarChar（255），但没有明确定义最大长度。另外，我希望服务器代码在收到令牌时做一个快速的检查，以确保它们看起来是正确的 - 什么是一个很好的最小长度和一组字符来检查？
<解决方案我认为这部分FCM仍然是GCM。因此，您应该参考@TrevorJohns的回答：

文档没有指定任何模式，因此任何有效的字符串都是允许的。 格式可能在将来改变;请不要对任何模式验证此输入，因为如果发生这种情况，这可能会导致您的应用程序中断。

registration_id字段的大小上限是cookie的最大大小，即4K（4096字节）。

强调格式可能在将来改变部分，我建议保持安全，并超出通常的最大（上述）长度。由于注册标记的格式和长度也可能有所不同。

对于通常的长度和字符，可以参考这些两个 答案 后者更明确：
$ b

我还没有看到有关GCM registrationId格式的任何官方信息，但是我已经分析了这些ID的数据库并且可以得出以下结论：在大多数情况下，注册ID的长度等于 162 符号，但是可以是变化的至 119 符号，也可能是其他长度;

只包含这个字符： [0-9a-zA-Z\每个regID包含一个或两个分隔符： - （减号）或_（下划线）








Working with the "new" Firebase Cloud Messaging, I would like to reliably save client device registration_id tokens to the local server database so that the server software can send them push notifications.

What is the smallest size of database field that I should use to save 100% of client registration tokens generated?

I have found two different libraries that use TextField and VarChar(255) but nothing categorically defining the max length. In addition, I would like the server code to do a quick length check when receiving tokens to ensure they "look" right - what would be a good min length and set of characters to check for?

解决方案

I think this part of FCM is still the same as GCM. Therefore, you should refer to this answer by @TrevorJohns:

The documentation doesn't specify any pattern, therefore any valid string is allowed. The format may change in the future; please do not validate this input against any pattern, as this may cause your app to break if this happens.

As with the "registration_id" field, the upper bound on size is the max size for a cookie, which is 4K (4096 bytes).

Emphasizing on the The format may change in the future part, I would suggest to stay safe and have a beyond the usual max (mentioned above) length. Since the format and length of a registration token may also vary.

For the usual length and characters, you can refer to these two answers the latter being much more definitive:

I hasn't seen any official information about format of GCM registrationId, but I've analyzed our database of such IDs and can make following conclusions:

• in most cases length of a registrationID equals 162 symbols, but can be variations to 119 symbols, maybe other lengths too;
• it consists only from this chars: [0-9a-zA-Z\-\_]*
• every regID contains one or both of "delimiters": - (minus) or _ (underline)

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