限制一个用户登录页面[关闭]

Question

Restrict sign as only one user at a time on a single page (admin) across the Internet. 2 administrators. admin1, admin2. When admin1 login from Germany Admin 2 will not be able to log in from Germany, USA, Switzerland etc.

Answer 1

This is possible, but how you'd do it would depend on your scenario as the approach, as always, depends on your exact requirements.

You need to identify if someone is already logged in, which can be done in a few ways.

You could use a specific session name for every login. When someone attempts to login, check if that session name already exists, but this makes it hard to manage problems you'll face.

DATABASE
You could set data in a temporary table when someone logs in, and check if this already exists when users attempt to login.
This approach would likely be better as one of the main issues you will face is knowing if someone who is logged in is no longer using the system and so someone else logging in is legitimate.

How you handle all this depends on your exact scenario though. eg perhaps this is in-house among a few users (say 5) and they all know that they must logout when they are done, otherwise no-one else can log in.

Otherwise, you could update the temporary table with activity (every time they click on or do something update the activity timestamp), and if last activity was X mins/hours ago then log the other user out and new one in.