How to generate User UID at my server using firebase server sdk?

[Lam Ha]

Hi,

I am trying to login at my server, how to generate unique id look like User UID of firebase?

This is my code.

        @RequestMapping("/login")

public String signInWithCustom(@RequestParam(value = "username") String username,

@RequestParam(value = "password") String password) {

User user = accountManager.login(username, password);

if (user == null) {

     return MessageFactory.createErrorMessage(1000, "User not found");

}

// TODO generate unique id look like User UID of firebase

String userUID = "how";

String token = FirebaseAuth.getInstance().createCustomToken(userUID);

Map<String, Object> params = new HashMap<String, Object>();

params.put("token", token);

return MessageFactory.createMessage(GsonUtils.toGsonString(user), params);

}

[Alex Memering]

Firebase uses randomly generated unique identifiers when a new user is created.  Then it always uses that same identifier for that particular user every time.  Since you're using custom authentication you can use whatever string you'd like for the user's UID, however you should take care so that each user's UID is unique to them.  You may want to look into generating a random UUID, generating a random string of alphanumeric characters, or possibly using the user's username.

Hope that helps,

Alex

Engineer @ Firebase

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