问题
I am creating security rules for my Firebase project and wanted to add UIDstring.length == 28 to my database rules. All of my users UIDs are 28 characters, but I wanted to check if they can be any longer or shorter?
Thanks
回答1:
A Firebase developer had this to say on their forums:
I would not rely on a constant length for the UIDs forever. We chose the current value because it provides a big enough ID space while still being under the 36-character limit for Firebase Analytics user properties.
So, in other words, what you're suggesting may or may not fail in the future, so you probably should find a different way of implementing it that's more future-proof.
回答2:
The uid of type string is used to assign to the newly created user. Must be a string between 1 and 128 characters long, inclusive. If not provided, a random uid will be automatically generated.
https://firebase.google.com/docs/auth/admin/manage-users
来源：https://stackoverflow.com/questions/43911234/is-a-firebase-uid-always-28-characters